ETRK0001-GE-O000-LC-RPT-0006 Ettrick and Blackbird ... · PDF fileEttrick and Blackbird...
111
Transcript of ETRK0001-GE-O000-LC-RPT-0006 Ettrick and Blackbird ... · PDF fileEttrick and Blackbird...
ET
RK
00
01
ET
TR
ICK
& B
LA
CK
BIR
D D
EC
OM
MIS
SIO
NIN
G
PR
OJ
EC
T
Co
mp
letio
n o
f ES
IA fo
r Bla
ck
bird
an
d E
ttrick
De
co
mm
issio
nin
g P
rog
ram
me
Docu
me
nt N
o:
ET
RK
000
1-G
E-O
000-L
C-R
PT
-0006
Rev:
U1
Rev
D
ate
R
ea
so
n fo
r Re
vis
ion
U1
1
5/1
2/1
6
ISS
UE
D F
OR
US
E
Au
tho
risatio
n
Re
co
rd
Po
sitio
n o
f Pre
pa
rer
Po
sitio
n o
f Ch
eck
er
Po
sitio
n o
f Ap
pro
ve
r
S
ign
atu
re h
ere
U1
1
5/1
2/1
6
SC
H
AF
E
HD
R
Rev
D
ate
P
rep
are
d b
y
Ch
ec
ke
d b
y
Ap
pro
ve
d b
y
J7
33
19
B
RE
PO
RT
Ettric
k a
nd
Bla
ckb
ird D
eco
mm
issio
nin
g E
IA
Pre
pare
d fo
r: N
exe
n P
etro
leu
m U
.K. L
imite
d
Pre
pare
d b
y:
Ge
ne
sis
6 A
lbyn P
lace, A
berd
een, A
B10 1
YH
, UK
T
el: +
44 (0
)1224 6
15100
F
ax: +
44 (0
)1224 6
15111
w
ww
.genesis
oila
ndgas.c
om
Pro
ject T
itle:
Co
mp
letio
n o
f ES
IA fo
r Bla
ck
bird
an
d E
ttrick D
eco
mm
issio
nin
g
Pro
gra
mm
e
Do
cu
me
nt/R
ev N
o:
J7
33
19
B-Y
-RT
-24006/D
3
Da
te:
No
v, 2
01
6
Re
v
Da
te
De
scrip
tion
Is
su
ed
by
C
he
ck
ed
by
A
pp
roved
by
Clie
nt
Ap
pro
val
D1
30/0
9/2
016
Is
sue
d fo
r Use
S
Ch
AF
e
HD
r
D2
16/1
1/2
016
Is
sue
d fo
r revie
w fo
llow
ing u
pdate
in lin
e w
ith B
EIS
com
ments
E
Si
MO
S
MO
S
D3
25/1
1/2
016
Is
sue
d fo
r Use
M
OS
E
Si
MO
S
Ettric
k a
nd
Bla
ckb
ird D
eco
mm
issio
nin
g E
IA
Do
cu
me
nt N
o. E
TR
K0
00
1-G
E-O
000-L
C-R
PT
-0006
No
ve
mb
er 2
016
P
ag
e 2
of 1
09
INF
OR
MA
TIO
N S
HE
ET
Pro
jec
t nam
e
En
viro
nm
en
tal Im
pa
ct A
ssessm
en
t for th
e D
eco
mm
issio
nin
g o
f the
Ettric
k a
nd
Bla
ckb
ird F
ield
De
ve
lopm
en
ts
Typ
e o
f pro
jec
t D
eco
mm
issio
nin
g
Un
de
rtak
en
na
me
Ne
xe
n P
etro
leu
m U
.K. L
imite
d (N
exe
n)
Un
de
rtak
en
ad
dre
ss
Ne
xe
n P
etro
leu
m U
K L
TD
D
isco
ve
ry H
ouse
, P
rime
Fo
ur B
usin
ess P
ark
, A
be
rde
en
, AB
15
8P
U
Ne
xe
n D
ocu
me
nt R
efe
ren
ce
Nu
mb
er
ET
RK
00
01
-GE
-O0
00
-LC
-RP
T-0
00
6
Lic
en
ce
s/o
wn
ers
N
exe
n P
etro
leu
m U
K L
imite
d is
the n
om
ina
ted
op
era
tor
Ettric
k fie
ld in
tere
sts
Ne
xe
n
80
%
Da
na
Pe
trole
um
(BV
UK
) Ltd
1
2 %
Atla
ntic
Petro
leu
m
8 %
Bla
ck
bird
field
inte
res
ts
Ne
xe
n
90
.6 %
Atla
ntic
Petro
leu
m
9.4
%
Sh
ort d
es
crip
tion
T
he
Ettric
k a
nd
Bla
ckb
ird fie
lds w
ere
op
era
ted
by N
exe
n P
etro
leum
(U
K) L
td (N
exe
n). B
oth
field
s w
ere
su
bsea
de
ve
lop
me
nts
, tied
back
to
the
Ao
ka
M
izu
F
loa
ting
Pro
ductio
n
Sto
rag
e
an
d
Offlo
adin
g
(FP
SO
) ve
sse
l. H
yd
roca
rbons w
ere
p
rocessed
a
nd
sto
red
o
n th
e
FP
SO
prio
r to e
xp
ort; o
il via
a s
hu
ttle ta
nke
r an
d g
as v
ia a
n e
xp
ort
rise
r a
nd
pip
elin
e
syste
m
co
nn
ecte
d
to
the
Scottis
h
Are
a
Gas
Eva
cu
atio
n
(SA
GE
) p
ipelin
e.
Wa
ter
Inje
ctio
n
an
d
gas
lift w
ere
a
va
ilable
to b
oth
field
s. P
rod
uctio
n c
ease
d a
t the fie
lds in
Jun
e 2
016
an
d th
e F
PS
O w
en
t offs
tatio
n o
n A
ug
ust 1
st 2
01
6. T
his
do
cum
en
t p
rovid
es
an
en
viro
nm
en
tal
imp
act
asse
ssm
en
t of
the
a
ctiv
ities
asso
cia
ted w
ith th
e d
eco
mm
issio
nin
g a
ctiv
ities.
An
ticip
ate
d d
ate
for c
om
men
ce
men
t
of w
ork
s
De
co
mm
issio
nin
g
activ
ities
ca
ptu
red
in
th
is
do
cum
en
t a
re
an
ticip
ate
d to
com
me
nce
in Q
1 2
01
7 a
nd
with
fina
l ove
r traw
lab
ility
trials
a
ntic
ipate
d in
Q
4 2
020.
Po
st
decom
mis
sio
nin
g su
rve
ys a
re
an
ticip
ate
d to
take
pla
ce
be
twe
en
Q2
20
21
an
d Q
3 2
022
.
Da
te a
nd
refe
ren
ce
of a
ny e
arlie
r
en
viro
nm
en
tal s
tate
me
nts
N
exe
n. (2
00
5). E
ttrick F
ield
De
ve
lop
me
nt E
nviro
nm
enta
l Sta
tem
en
t. D
TI P
roje
ct R
efe
rence
No
. W/2
81
7/2
00
5.
Ne
xe
n.
(20
10
). B
lackb
ird
De
ve
lop
men
t E
nviro
nm
enta
l S
tate
me
nt,
BB
D-H
S-S
TA
-00
01
1.
Sig
nific
an
t en
viro
nm
en
tal im
pa
cts
ide
ntifie
d
No
ne
EIA
pre
pa
red
by
Ge
ne
sis
Oil a
nd G
as C
on
sulta
ncy L
td.
Ettric
k a
nd
Bla
ckb
ird D
eco
mm
issio
nin
g E
IA
Do
cu
me
nt N
o. E
TR
K0
00
1-G
E-O
000-L
C-R
PT
-0006
No
ve
mb
er 2
016
P
ag
e 3
of 1
09
Th
is p
ag
e is
inte
ntio
na
lly le
ft bla
nk
Ettric
k a
nd
Bla
ckb
ird D
eco
mm
issio
nin
g E
IA
Do
cu
me
nt N
o. E
TR
K0
00
1-G
E-O
000-L
C-R
PT
-0006
No
ve
mb
er 2
016
P
ag
e 4
of 1
09
Co
nte
nts
IN
FO
RM
AT
ION
SH
EE
T ........................................................................................................ 2
EX
EC
UT
IVE
SU
MM
AR
Y ...................................................................................................... 9
Ba
ckgro
un
d In
form
atio
n ............................................................................................... 9
De
com
mis
sio
nin
g A
ctiv
ities ........................................................................................ 1
0
En
viro
nm
enta
l and
So
cio
-Eco
no
mic
Base
line ............................................................ 1
0
Imp
act A
sse
ssm
ent .................................................................................................... 1
1
En
erg
y U
se a
nd
Em
issio
ns to
Air ....................................................................... 1
1
Dis
ch
arg
es to
Se
a ............................................................................................. 1
2
So
lid D
ep
osits
on th
e S
ea
be
d a
nd
Dis
turb
an
ce to
Se
ab
ed
................................ 12
Un
de
rwa
ter N
ois
e .............................................................................................. 1
2
Waste
Ma
na
ge
me
nt a
nd R
esou
rce U
se ............................................................ 1
2
Accid
en
tal E
ve
nts
.............................................................................................. 13
So
cio
-Eco
no
mic
Imp
acts
................................................................................... 13
En
viro
nm
enta
l Ma
na
ge
me
nt ....................................................................................... 1
5
Co
nclu
sio
n ................................................................................................................. 1
6
AB
BR
EV
IAT
ION
S ............................................................................................................... 1
7
IN
TR
OD
UC
TIO
N ........................................................................................................ 1
9
1.0
1.1
P
roje
ct B
ackg
rou
nd ........................................................................................... 1
9
1.2
P
urp
ose
of T
his
Do
cum
en
t ................................................................................ 20
1.3
R
eg
ula
tory
Co
nte
xt ............................................................................................ 2
0
1.4
S
take
ho
lder C
onsid
era
tion
................................................................................. 22
1.5
E
nviro
nm
enta
l Ma
na
ge
me
nt .............................................................................. 2
2
P
RO
JE
CT
DE
SC
RIP
TIO
N ......................................................................................... 2
5
2.0
2.1
F
ield
Ove
rvie
w ................................................................................................... 2
5
2.2
E
ttrick a
nd
Bla
ckb
ird S
ub
sea
Infra
stru
ctu
re ....................................................... 2
8
2.2
.1 W
ells
......................................................................................................... 31
2.2
.2 R
ise
r and
Dyn
am
ic U
mb
ilica
ls ................................................................... 3
1
2.2
.3 P
rodu
ctio
n F
low
lines ................................................................................. 3
1
2.2
.4 W
ate
r Inje
ctio
n F
low
lines .......................................................................... 3
2
2.2
.5 G
as L
ift Flo
wlin
es ...................................................................................... 3
2
2.2
.6 G
as E
xp
ort F
low
lines ................................................................................ 3
2
2.2
.7 U
mb
ilica
l Lin
es .......................................................................................... 3
2
2.2
.8 O
ther S
tructu
res ........................................................................................ 3
2
2.2
.9 F
PS
O M
oorin
gs ........................................................................................ 3
3
2.2
.10
Pro
tectiv
e S
tructu
res ............................................................................ 3
3
Ettric
k a
nd
Bla
ckb
ird D
eco
mm
issio
nin
g E
IA
Do
cu
me
nt N
o. E
TR
K0
00
1-G
E-O
000-L
C-R
PT
-0006
No
ve
mb
er 2
016
P
ag
e 5
of 1
09
2.3
A
ctiv
ities to
Date
................................................................................................ 33
2.3
.1 F
lushin
g a
nd P
urg
ing
of th
e T
opsid
es a
nd S
ubse
a In
frastru
ctu
re .............. 3
3
2.3
.2 D
isco
nn
ectio
n o
f the D
isco
nn
ecta
ble
Turre
t Bu
oy ..................................... 3
4
2.3
.3 R
ecove
ry o
f Se
ctio
n o
f Ga
s E
xp
ort P
ipelin
e a
nd
Se
ctio
ns o
f Rig
id S
poo
ls 3
4
2.4
S
ch
ed
ule
of A
ctiv
ities ......................................................................................... 3
4
2.5
F
ate
of th
e E
ttrick a
nd B
lackb
ird In
frastru
ctu
re .................................................. 3
5
2.5
.1 C
om
pa
rativ
e A
sse
ssm
ent ......................................................................... 3
5
2.6
D
ecom
mis
sio
nin
g A
ctiv
ities ............................................................................... 3
7
2.6
.1 W
ell A
ban
do
nm
ent / S
hut-in
...................................................................... 37
2.6
.2 S
ubse
a D
econ
stru
ctio
n ............................................................................. 3
7
2.6
.3 R
ock C
ove
r Re
qu
irem
ents
........................................................................ 38
2.6
.4 V
essel R
eq
uire
me
nts
................................................................................ 40
2.6
.5 F
ate
Afte
r Lea
vin
g F
ield
............................................................................ 41
2.6
.6 S
urv
ey a
nd
Mo
nito
ring
Pro
gra
mm
e ........................................................... 4
1
E
NV
IRO
NM
EN
TA
L D
ES
CR
IPT
ION
........................................................................... 42
3.0
3.1
P
hysic
al E
nviro
nm
ent ........................................................................................ 4
3
3.1
.1 B
ath
ym
etry
................................................................................................ 43
3.1
.2 W
ate
r Ma
sses, C
urre
nts
and
Tid
al S
tream
s .............................................. 4
3
3.1
.3 S
ea T
em
pera
ture
an
d S
alin
ity ................................................................... 4
4
3.1
.4 S
edim
ents
................................................................................................. 45
3.1
.5 W
ate
r Qu
ality
............................................................................................ 45
3.2
E
nviro
nm
enta
l Leg
isla
tion
Pro
tectin
g H
abita
ts a
nd
Sp
ecie
s ............................... 4
5
3.2
.1 H
abita
ts ..................................................................................................... 4
7
3.2
.2 S
co
ttish
Ma
rine
Pro
tecte
d A
rea
s ............................................................... 4
8
3.2
.3 S
pecie
s ..................................................................................................... 5
0
3.2
.4 P
riority
Ma
rine
Fe
atu
res ............................................................................ 5
0
3.3
M
arin
e F
lora
and
Fa
una ..................................................................................... 5
0
3.3
.1 P
lankto
n .................................................................................................... 5
0
3.3
.2 B
enth
os ..................................................................................................... 5
1
3.3
.3 F
ish
an
d S
he
llfish
...................................................................................... 52
3.3
.4 M
arin
e M
am
ma
ls....................................................................................... 5
2
3.3
.5 S
ea
bird
s .................................................................................................... 5
4
S
OC
IO-E
CO
NO
MIC
DE
SC
RIP
TIO
N .......................................................................... 5
6
4.0
4.1
.1 S
hip
pin
g .................................................................................................... 5
6
4.1
.2 C
om
merc
ial F
ish
ing .................................................................................. 5
7
4.1
.3 O
ther O
il & G
as D
eve
lop
me
nts
................................................................. 60
Ettric
k a
nd
Bla
ckb
ird D
eco
mm
issio
nin
g E
IA
Do
cu
me
nt N
o. E
TR
K0
00
1-G
E-O
000-L
C-R
PT
-0006
No
ve
mb
er 2
016
P
ag
e 6
of 1
09
4.1
.4 M
ilitary
Exe
rcis
e A
reas .............................................................................. 6
1
4.1
.5 O
ther P
ote
ntia
l Use
rs ................................................................................ 6
1
T
HE
EN
VIR
ON
ME
NT
AL
IMP
AC
T A
SS
ES
SM
EN
T P
RO
CE
SS
................................... 62
5.0
5.1
O
ve
rvie
w ........................................................................................................... 6
2
5.2
T
he E
IA M
eth
od
olo
gy ........................................................................................ 6
2
5.3
A
sse
ssm
ent o
f Pote
ntia
l Imp
acts
and
Contro
l Me
asu
res ................................... 6
5
F
UR
TH
ER
AS
SE
SS
ME
NT
OF
PO
TE
NT
IAL E
NV
IRO
NM
EN
TA
L IM
PA
CT
S .............. 6
6
6.0
6.1
E
nerg
y U
se a
nd
Atm
osph
eric
Em
issio
ns ........................................................... 6
6
6.1
.1 A
ctiv
ities (C
ause
of Im
pact) ....................................................................... 6
6
6.1
.2 Im
pact o
n R
ecepto
rs ................................................................................. 6
8
6.1
.3 T
ran
sbo
un
da
ry a
nd C
um
ula
tive
Imp
acts
................................................... 69
6.1
.4 C
ontro
l and M
itiga
tion
Me
asu
res ............................................................... 6
9
6.1
.5 C
onclu
sio
n ................................................................................................ 6
9
6.2
D
isch
arg
es to
Se
a ............................................................................................. 7
0
6.2
.1 A
ctiv
ities (C
ause
of Im
pact) ....................................................................... 7
0
6.2
.2 Im
pacts
on R
ecepto
rs ............................................................................... 7
1
6.2
.3 T
ran
sbo
un
da
ry a
nd C
um
ula
tive
Imp
acts
................................................... 71
6.2
.4 C
ontro
l and M
itiga
tion
Me
asu
res ............................................................... 7
1
6.2
.5 C
onclu
sio
ns .............................................................................................. 7
2
6.3
S
olid
Dep
osits
on th
e S
ea
be
d a
nd
Dis
turb
an
ce to
the S
eab
ed
.......................... 72
6.3
.1 A
ctiv
ities (C
ause
of Im
pact) ....................................................................... 7
2
6.3
.2 Im
pact o
n R
ecepto
rs ................................................................................. 7
2
6.3
.3 T
ran
sbo
un
da
ry a
nd C
um
ula
tive
................................................................ 75
6.3
.4 C
ontro
l and M
itiga
tion
Me
asu
res ............................................................... 7
5
6.3
.5 C
onclu
sio
n ................................................................................................ 7
6
6.4
U
nde
rwa
ter N
ois
e .............................................................................................. 7
6
6.4
.1 A
ctiv
ities (C
ause
of Im
pact) ....................................................................... 7
6
6.4
.2 Im
pacts
on R
ecepto
rs ............................................................................... 7
7
6.4
.3 T
ran
sbo
un
da
ry a
nd C
um
ula
tive
Imp
acts
................................................... 79
6.4
.4 C
ontro
l and M
itiga
tion
Me
asu
res ............................................................... 8
0
6.4
.5 C
onclu
sio
n ................................................................................................ 8
0
6.5
W
aste
Ma
nag
em
ent a
nd R
esou
rce U
se ............................................................ 8
0
6.5
.1 R
eg
ula
tory
Re
qu
irem
ents
.......................................................................... 80
6.5
.2 A
ctiv
ities (C
ause
of Im
pact) ....................................................................... 8
1
6.5
.3 Im
pacts
on R
ecepto
rs ............................................................................... 8
3
6.5
.4 T
ran
sbo
un
da
ry a
nd C
um
ula
tive
Imp
acts
................................................... 84
Ettric
k a
nd
Bla
ckb
ird D
eco
mm
issio
nin
g E
IA
Do
cu
me
nt N
o. E
TR
K0
00
1-G
E-O
000-L
C-R
PT
-0006
No
ve
mb
er 2
016
P
ag
e 7
of 1
09
6.5
.5 C
ontro
l and M
itiga
tion
Me
asu
res ............................................................... 8
4
6.5
.6 C
onclu
sio
n ................................................................................................ 8
4
6.6
A
ccid
en
tal E
ve
nts
.............................................................................................. 84
6.6
.1 A
ctiv
ities (C
ause
of Im
pacts
) ..................................................................... 84
6.6
.2 Im
pacts
on R
ecepto
rs ............................................................................... 8
5
6.6
.3 T
ran
sbo
un
da
ry a
nd C
um
ula
tive
Imp
acts
................................................... 86
6.6
.4 C
ontro
l and M
itiga
tion
Me
asu
res ............................................................... 8
6
6.6
.5 C
onclu
sio
ns .............................................................................................. 8
7
6.7
S
ocio
-Eco
no
mic
Imp
acts
................................................................................... 87
6.7
.1 A
ctiv
ities (C
ause
of Im
pacts
) ..................................................................... 87
6.7
.2 Im
pacts
on R
ecepto
rs ............................................................................... 8
7
6.7
.3 T
ran
sbo
un
da
ry a
nd C
um
ula
tive
Imp
acts
................................................... 88
6.7
.4 C
ontro
l and M
itiga
tion
Me
asu
res ............................................................... 8
8
6.7
.5 C
onclu
sio
n ................................................................................................ 8
8
C
ON
CL
US
ION
S ......................................................................................................... 8
9
7.0
7.1
E
nerg
y U
se a
nd
Atm
osph
eric
Em
issio
ns ........................................................... 8
9
7.2
D
isch
arg
es to
Se
a ............................................................................................. 8
9
7.3
S
olid
Dep
osits
on th
e S
ea
be
d a
nd
Dis
turb
an
ce to
the S
eab
ed
.......................... 90
7.4
U
nde
rwa
ter N
ois
e .............................................................................................. 9
0
7.5
W
aste
Ma
na
ge
me
nt a
nd R
esou
rce U
se ............................................................ 9
0
7.6
A
ccid
en
tal E
ve
nts
.............................................................................................. 90
7.7
S
ocio
-Eco
no
mic
Imp
acts
................................................................................... 90
7.8
O
ve
rall C
onclu
sio
n ............................................................................................. 9
0
R
EF
ER
EN
CE
S ........................................................................................................... 9
2
8.0
A
PP
EN
DIX
A E
NV
ID T
AB
LE
S. .................................................................................. 9
7
9.0
Ettric
k a
nd
Bla
ckb
ird D
eco
mm
issio
nin
g E
IA
Do
cu
me
nt N
o. E
TR
K0
00
1-G
E-O
000-L
C-R
PT
-0006
No
ve
mb
er 2
016
P
ag
e 8
of 1
09
[Th
is p
ag
e is
inte
ntio
na
lly le
ft bla
nk]
Ettric
k a
nd
Bla
ckb
ird D
eco
mm
issio
nin
g E
IA
Do
cu
me
nt N
o. E
TR
K0
00
1-G
E-O
000-L
C-R
PT
-0006
No
ve
mb
er 2
016
P
ag
e 9
of 1
09
EX
EC
UT
IVE
SU
MM
AR
Y
Th
e E
ttrick a
nd B
lackb
ird (E
&B
) field
s lie
in th
e O
ute
r Mo
ray F
irth A
rea in
the C
entra
l No
rth
Se
a (C
NS
) and
are
opera
ted
by N
exe
n P
etro
leum
(UK
) Ltd
(here
afte
r refe
rred to
as N
exe
n).
Ne
xe
n h
as p
rep
are
d th
is E
nviro
nm
enta
l Imp
act A
sse
ssm
ent (E
IA) u
nd
er th
e P
etro
leum
Act
199
8, in
su
pp
ort o
f four d
raft D
ecom
mis
sio
nin
g P
rogra
mm
es (c
olle
ctiv
ely
refe
rred to
here
as
the E
&B
dra
ft De
com
mis
sio
nin
g P
rog
ram
me
s) th
at a
re b
ein
g s
ubm
itted to
the D
epa
rtme
nt
for B
usin
ess, E
nerg
y a
nd
Indu
stria
l Stra
teg
y (B
EIS
), form
erly
kn
ow
n a
s th
e D
epa
rtme
nt o
f E
nerg
y a
nd
Clim
ate
Ch
an
ge
(DE
CC
), to s
eek a
pp
rova
l for th
e a
ctiv
ities a
sso
cia
ted
with
the
deco
mm
issio
nin
g o
f the:
(1)
Ettric
k in
sta
llatio
ns;
(2)
Ettric
k p
ipelin
es;
(3)
Bla
ckb
ird in
sta
llatio
ns; a
nd
(4)
Bla
ckb
ird p
ipelin
es.
Backg
rou
nd
Info
rmatio
n
Th
e E
&B
field
s lie
with
in Q
uad
rants
20/2
a a
nd
20/3
a in
the O
ute
r Mo
ray F
irth A
rea c
.120 k
m
north
ea
st o
f Ab
erd
ee
n in
110
m w
ate
r dep
th (F
igu
re 1
) and
we
re p
rod
uced
via
the A
oka
M
izu
Flo
atin
g P
rodu
ctio
n S
tora
ge
and O
ffload
ing
(FP
SO
) ve
ssel. P
roductio
n fro
m th
e E
&B
fie
lds c
ease
d in
Ju
ne
201
6 a
nd
the F
PS
O w
ent o
ff sta
tion o
n 1
st A
ug
ust 2
016
.
Both
field
s w
ere
pre
dom
inan
tly o
il reserv
oirs
with
the F
PS
O p
rovid
ing
pro
ce
ssin
g c
apa
bility
. T
he o
il wa
s s
tore
d o
n th
e F
PS
O a
nd
batc
h e
xp
orte
d v
ia a
sh
uttle
tanke
r, wh
ilst th
e g
as w
as
exp
orte
d v
ia a
ga
s e
xp
ort ris
er a
nd
pip
elin
e s
yste
m c
onn
ecte
d to
the S
co
ttish
Are
a G
as
Eva
cua
tion
(SA
GE
) pip
elin
e. W
ate
r Inje
ctio
n (W
I) and
gas lift w
ere
ava
ilable
to b
oth
field
s
via
su
bse
a p
ipelin
es a
nd
infra
stru
ctu
re.
Fig
ure
1: L
oc
atio
n o
f the
Ettric
k a
nd
Bla
ckb
ird fie
ld.
Ettric
k a
nd
Bla
ckb
ird D
eco
mm
issio
nin
g E
IA
Do
cu
me
nt N
o. E
TR
K0
00
1-G
E-O
000-L
C-R
PT
-0006
No
ve
mb
er 2
016
P
ag
e 1
0 o
f 109
Deco
mm
issio
nin
g A
ctiv
ities
Ne
xe
n p
rop
ose to
P
lug a
nd
A
ban
do
n (P
&A
) an
d d
eco
mm
issio
n th
e E
&B
fie
lds in
fo
ur
pha
ses/s
co
pe
s:
· P
hase
1: S
ubse
a s
co
pe
1 w
hic
h in
clu
de
s re
cove
ry o
f the D
eta
ch
ab
le T
urre
t Bu
oy
(DT
B), ris
ers
, dyn
am
ic u
mb
ilica
l’s, M
id W
ate
r Arc
h (M
WA
) and m
oorin
gs;
· P
hase
2: W
ell P
&A
;
· P
hase
3: S
ubse
a s
co
pe 2
wh
ich
inclu
de
s re
cove
ry o
f ma
nifo
lds, S
ubsea
Safe
ty
Iso
latio
n V
alv
e (S
SIV
), Su
bse
a D
istrib
utio
n U
nit (S
DU
s), ju
mp
ers
, transitio
n e
nd
s
and
exp
ose
d s
ectio
ns o
f pip
elin
es a
nd
um
bilic
als
. Gro
ut b
ag
s a
nd
ma
ttresse
s w
ill a
lso
be
reco
ve
red
durin
g th
is p
hase
;
· P
hase
4: P
ost d
ecom
mis
sio
nin
g s
urv
ey.
Th
e o
ve
rall d
eco
mm
issio
nin
g p
rog
ram
me is
exp
ecte
d to
last a
ppro
xim
ate
ly s
ix y
ears
.
Infra
stru
ctu
re to
be re
cove
red
as p
art o
f the d
ecom
mis
sio
nin
g a
ctiv
ities in
clu
de
s:
· M
oorin
g a
nch
ors
and
moo
ring
ch
ain
s;
· A
ll we
llhea
ds;
· A
ll su
bse
a in
frastru
ctu
re (a
rch
es, s
kid
s m
anifo
lds e
tc.);
· A
ll su
rface la
id ris
ers
, spo
ols
, jum
pers
and u
mb
ilica
ls; a
nd
· C
oncre
te m
attre
sses a
nd
gro
ut b
ag
s.
A c
om
pa
rativ
e a
ssessm
ent w
as c
arrie
d o
ut fo
r the tre
nch
ed
and
burie
d E
&B
pip
elin
es a
nd
u
mb
ilica
ls. T
he a
sse
ssm
ent fa
vo
ure
d a
co
mb
inatio
n o
f the fo
llow
ing
two
op
tions:
· R
ock c
ove
r transitio
n e
nd
s a
nd
cut a
nd
rem
ove
exp
ose
d p
ipelin
e s
ectio
ns; a
nd
· B
ury
transitio
n e
nd
s a
nd ro
ck c
ove
r exp
ose
d s
ectio
ns.
En
viro
nm
en
tal a
nd
So
cio
-Eco
no
mic
Ba
selin
e
Th
e s
eab
ed
in th
e v
icin
ity o
f E&
B s
ubse
a in
frastru
ctu
re is
rela
tive
ly fla
t at d
ep
ths o
f betw
een
9
0 a
nd
13
0 m
. Th
e w
ate
r cu
rrents
in th
e E
&B
deve
lopm
ent a
rea
are
pre
dom
inan
tly d
rive
n b
y
the F
air
Isle
C
urre
nt
and
th
e D
oole
y C
urre
nt
mo
vin
g in
a
n a
ntic
lockw
ise
d
irectio
n.
Th
e
se
dim
ent in
the a
rea
of th
e E
ttrick s
ubse
a in
frastru
ctu
re is
sa
nd
and
mu
dd
y s
and
and
the
se
dim
ent in
the a
rea o
f the B
lackb
ird d
eve
lopm
ent is
pre
do
min
antly
fine
silty
sa
nd
to v
ery
fin
e s
and
s.
No
evid
en
ce o
f se
nsitiv
e h
ab
itats
pro
tecte
d u
nd
er A
nne
x I o
f the E
U H
abita
ts D
irectiv
e h
ave
th
us b
ee
n fo
un
d a
t the E
&B
deve
lopm
ents
.
Po
ckm
ark
s h
ave
bee
n s
een
in th
e B
lackb
ird a
rea
, associa
ted w
ith th
e n
ear s
urfa
ce g
eolo
gy
of
the W
itch
G
roun
d F
orm
atio
ns.
In th
e pro
xim
ity of
the d
eve
lopm
ent
itse
lf a
fe
w sm
all
se
ab
ed
d
ep
ressio
ns a
nd
o
ne
la
rge
d
epre
ssio
n w
ere
id
en
tified,
all
of
wh
ich
h
ave
b
ee
n
attrib
ute
d to
sco
ur a
roun
d b
ou
lders
. Th
e d
ete
cte
d p
ockm
ark
s s
how
ed n
o e
vid
en
ce o
f gas
leakag
e o
r Me
tha
ne D
eriv
ed A
uth
ige
nic
Ca
rbo
nate
(MD
AC
) stru
ctu
res.
Lop
he
lia p
ertu
sa is
kn
ow
n to
occur a
s m
arin
e g
row
th o
n o
ffsh
ore
insta
llatio
ns in
the N
orth
S
ea
(OG
UK
, 2
01
3),
how
eve
r su
rve
ys
ca
rried
out
at
the
E&
B
deve
lopm
ents
h
ave
n
ot
iden
tified th
e p
rese
nce
of th
is fre
shw
ate
r co
ral.
Th
e
pla
nkto
nic
a
ssem
bla
ge
in
th
e
are
a
of
the
B
lackb
ird
and
E
ttrick
De
ve
lopm
ents
is
co
nsid
ere
d ty
pic
al o
f the N
orth
Se
a. T
he b
enth
ic in
faun
al c
om
mu
nitie
s in
the E
&B
are
a a
re
Ettric
k a
nd
Bla
ckb
ird D
eco
mm
issio
nin
g E
IA
Do
cu
me
nt N
o. E
TR
K0
00
1-G
E-O
000-L
C-R
PT
-0006
No
ve
mb
er 2
016
P
ag
e 1
1 o
f 109
typ
ica
l of th
e C
NS
with
the n
orm
al p
oly
ch
ae
te d
om
inate
d s
tructu
re e
xh
ibitin
g h
igh
div
ers
ity
and
mo
dera
te a
bu
nd
an
ce
s.
Kn
ow
n fis
h s
pa
wn
ing
and
nu
rsery
gro
un
ds in
the v
icin
ity in
clu
de
wh
iting
, lem
on
so
le, N
orw
ay
pou
t, spra
t, Ne
phro
ps a
nd
sa
nd
ee
l. A n
um
ber o
f the s
pecie
s id
en
tified h
ave
bee
n a
ssesse
d
by S
co
ttish
Na
tura
l He
ritag
e (S
NH
) and J
oin
t Na
ture
Co
nse
rva
tion
Co
mm
ittee (J
NC
C) a
s
Prio
rity M
arin
e F
ea
ture
s (P
MF
) in
S
co
tlan
d.
Ma
rine S
co
tlan
d h
as re
gis
tere
d a
‘p
erio
d o
f co
nce
rn’ fo
r se
ism
ic a
nd d
rilling
activ
ity in
the v
icin
ity o
f Blo
ck 2
0/0
2 a
nd
Blo
ck 2
0/0
3 fro
m
Feb
rua
ry to
Ju
ne.
Ha
rbo
ur p
orp
ois
e, m
inke w
hale
, wh
ite-b
ea
ke
d d
olp
hin
, wh
ite-s
ided
dolp
hin
, Ris
so
’s d
olp
hin
a
nd
kille
r wh
ale
have
be
en s
igh
ted
in th
e a
rea. D
ata
indic
ate
that m
inke w
ha
le, k
iller w
hale
, b
ottle
no
se
dolp
hin
, w
hite
-sid
ed
d
olp
hin
a
nd
R
isso
’s
dolp
hin
o
ccur
in
rela
tive
ly
low
abundance. T
he d
en
sitie
s o
f wh
ite-b
eake
d d
olp
hin
and
harb
ou
r porp
ois
e v
ary
from
low
to
hig
h th
roug
hou
t the y
ear b
ut a
pp
ea
r to b
e re
lativ
ely
hig
h in
the s
um
mer m
onth
s. G
ive
n th
e
dis
tance
of th
e E
&B
field
s fro
m th
e c
oast it is
unlik
ely
that h
arb
our s
ea
ls w
ill occur. It is
p
ossib
le th
at
gre
y se
als
m
ay fo
rag
e in
th
e are
a,
how
eve
r b
ase
d o
n o
bse
rve
d fo
rag
ing
ra
ng
es n
um
bers
wo
uld
be
exp
ecte
d to
be lo
w.
Se
ab
ird vu
lnera
bility
th
rou
gh
out
the ye
ar
va
ries fro
m lo
w (J
anu
ary
a
nd
M
ay),
mo
de
rate
(M
arc
h, A
pril a
nd
De
cem
be
r) and h
igh (F
ebru
ary
, Ju
ne
and
No
ve
mb
er) to
ve
ry h
igh
(Ju
ly to
O
cto
ber). O
ve
rall a
nn
ua
l vu
lnera
bility
is c
lassed
as h
igh.
Th
ere
are
a n
um
ber o
f pro
tecte
d s
ites w
ithin
the v
icin
ity o
f the E
&B
field
s, th
e n
eare
st b
ein
g
the T
urb
ot B
ank N
atu
re C
onse
rva
tion
Ma
rine P
rote
cte
d A
rea
(NC
MP
A) c
. 40km
so
uth
of
Blo
ck 2
0/2
. Th
e n
ea
rest S
ite o
f Com
mu
nity
Impo
rtance
to th
e E
&B
deve
lopm
ents
are
the
Bra
em
ar
Po
ckm
ark
s a
nd
th
e S
ca
nn
er
Po
ckm
ark
S
pecia
l A
reas o
f C
onse
rva
tion
(S
AC
s)
wh
ich
lie c
. 150
km
east n
orth
ea
st a
nd
93 k
m n
orth
ea
st o
f Blo
ck 2
0/3
respe
ctiv
ely
. The
nea
rest o
nsh
ore
pro
tecte
d s
ite is
the B
ucha
n N
ess to
Co
lliesto
n C
oast S
pecia
l Pro
tectio
n
Are
a (S
PA
), wh
ich
is c
.70
km
so
uth
we
st o
f the d
eve
lopm
ents
.
Sh
ippin
g a
ctiv
ity w
ithin
the a
rea
of th
e E
&B
field
s is
co
nsid
ere
d m
ode
rate
. Fis
hin
g e
ffort b
y
UK
ve
ssels
(num
ber o
f ve
ssel d
ays) w
ithin
the a
rea
is c
onsid
ere
d to
rang
e fro
m re
lativ
ely
lo
w to
mo
de
rate
.
Blo
cks 2
0/2
and
20/3
are
locate
d w
ithin
a w
ell-d
eve
lope
d o
il and
ga
s re
gio
n. T
he n
eare
st
su
rface
insta
llatio
ns
are
th
e
Go
lden
eye
, th
e
Go
lden
E
ag
le
and
th
e
Bu
zza
rd
Pla
tform
s
locate
d c
.15 k
m, 1
6 k
m a
nd 2
5 k
m re
spe
ctiv
ely
from
Ettric
k.
Th
e c
losest w
indfa
rm d
eve
lopm
ent to
the E
&B
deve
lopm
ents
is th
e M
ora
y F
irth W
indfa
rm
wh
ich
is lo
ca
ted
c.1
05 k
m n
orth
we
st o
f the b
locks.
Imp
act A
sse
ssm
en
t
Ce
ntra
l to th
e E
IA p
rocess is
the re
qu
irem
ent to
iden
tify a
ctiv
ities th
at c
ou
ld c
ause
harm
to
the e
nviro
nm
ent
or
oth
er
users
of
that
enviro
nm
en
t. A
s su
ch,
an E
nviro
nm
enta
l Im
pact
Iden
tificatio
n
(EN
VID
) w
ork
sh
op
w
as
und
erta
ke
n
to
facilita
te
iden
tifica
tion
of
the
enviro
nm
enta
l and
socia
l imp
acts
asso
cia
ted
with
the p
roje
ct.
En
erg
y U
se a
nd
Em
issio
ns
to A
ir
Em
issio
ns re
sultin
g fro
m fu
el u
se b
y th
e v
essels
and
durin
g re
cyclin
g o
f recove
red
ma
teria
ls
will
pro
du
ce g
reen
ho
use
g
ases a
nd
m
ake
a
ve
ry sm
all
co
ntrib
utio
n to
clim
ate
ch
an
ge.
Sta
nd
ard
mitig
atio
n m
easu
res to
optim
ise
ene
rgy u
sag
e b
y v
essels
will in
clu
de
ope
ratio
na
l p
ractic
es
and
p
ow
er
ma
nag
em
ent
syste
ms
for
eng
ines,
ge
ne
rato
rs
and
a
ny
oth
er
co
mb
ustio
n p
lant a
nd
pla
nn
ed
pre
ve
nta
tive
ma
inte
na
nce
syste
ms fo
r all e
qu
ipm
ent fo
r peak
ope
ratio
na
l effic
iency.
Ettric
k a
nd
Bla
ckb
ird D
eco
mm
issio
nin
g E
IA
Do
cu
me
nt N
o. E
TR
K0
00
1-G
E-O
000-L
C-R
PT
-0006
No
ve
mb
er 2
016
P
ag
e 1
2 o
f 109
Dis
ch
arg
es to
Sea
Th
ere
is
th
e p
ote
ntia
l for
sm
all
qu
antitie
s o
f re
sid
ua
l ch
em
ica
ls a
nd
hyd
roca
rbo
ns to
be
rele
ase
d in
to th
e w
ate
r co
lum
n fro
m liftin
g o
f su
bse
a in
frastru
ctu
re a
nd
from
ve
ssels
used
for
deco
mm
issio
nin
g. T
he s
eab
ed
and
the w
ate
r co
lum
n a
re th
e p
rima
ry re
ce
pto
rs. M
itiga
tion
inclu
de
s a
su
ccessfu
l po
st C
essatio
n o
f Pro
ductio
n (C
OP
) deo
iling
pro
gra
mm
e, c
hem
ica
l se
lectio
n p
roce
sse
s, p
erm
itting
of h
yd
roca
rbo
n a
nd
ch
em
ica
l dis
ch
arg
es a
nd
stric
t ve
ssel
ope
ratin
g p
roce
dure
s. A
ll of th
ese
imp
acts
will b
e lo
calis
ed a
nd
sh
ort te
rm g
ive
n th
e h
igh
ly
dyn
am
ic e
nviro
nm
ent a
roun
d E
&B
So
lid D
ep
osits
on
the S
eab
ed
an
d D
istu
rban
ce
to S
eab
ed
Th
e prin
cip
al
so
urc
es of
se
ab
ed
d
istu
rban
ce asso
cia
ted
w
ith th
e E
&B
d
eco
mm
issio
nin
g
activ
ities co
nce
rn th
e re
mo
va
l o
f stru
ctu
res,
sp
oo
ls,
ma
ttresse
s a
nd
g
rout
bag
s,
cu
tting
ope
ratio
ns, a
nch
orin
g o
f the s
em
i-su
bm
ers
ible
drillin
g rig
and
the p
lacem
ent o
f add
itiona
l ro
ck c
ove
r (estim
ate
d a
t c. 1
1,0
00 te
) on th
e e
xp
ose
d p
ipelin
e e
nd
s. T
he
se a
ctiv
ities w
ill re
sult in
the d
isp
lacem
ent o
f su
bstra
te a
nd
the s
uspe
nsio
n a
nd
su
bse
qu
en
t se
ttlem
ent o
f se
dim
ent.
Th
e s
pecie
s a
nd
hab
itats
obse
rve
d in
the v
icin
ity o
f the E
&B
field
s a
re re
lativ
ely
wid
esp
rea
d
thro
ug
hout
the
CN
S
and
th
e
are
a
antic
ipate
d to
b
e
imp
acte
d re
pre
sen
ts
a
ve
ry
sm
all
perc
enta
ge
of th
e a
va
ilab
le h
ab
itat. A
ll dis
turb
ed s
edim
ents
are
exp
ecte
d to
recove
r rapid
ly
thoug
h re
cru
itme
nt fro
m a
dja
cen
t und
istu
rbed
are
as.
Me
asu
res
to
co
ntro
l d
istu
rba
nce
inclu
de
o
pe
ratio
na
l p
lann
ing
, m
inim
isa
tion
of
rock
pla
cem
ent w
here
po
ssib
le a
nd
eq
uip
me
nt s
ele
ctio
n.
Du
e to
the lo
calis
ed a
nd
rela
tive
ly s
hort d
ura
tion
of th
e d
ecom
mis
sio
nin
g a
ctiv
ities, a
nd
with
th
e id
en
tified c
ontro
l and
mitig
atio
n m
easure
s in
pla
ce, th
e o
ve
rall s
ign
ifica
nce
of th
e im
pact
of s
eab
ed d
istu
rba
nce
as a
resu
lt of th
e d
ecom
mis
sio
nin
g o
f E&
B fie
lds is
co
nsid
ere
d to
be
low
.
Un
de
rwa
ter N
ois
e
Th
e m
ain
so
urc
es of
un
de
rwa
ter
so
un
d a
ssocia
ted
w
ith th
e p
rop
osed d
eco
mm
issio
nin
g
activ
ities a
t E&
B in
clu
de
acou
stic
surv
eyin
g e
qu
ipm
en
t, ve
ssels
, cuttin
g to
ols
and
oth
er d
ive
r to
ols
and
pla
cem
ent o
f rock c
ove
r.
So
un
d is
imp
orta
nt fo
r ma
rine
mam
ma
ls fo
r navig
atio
n, c
om
mu
nic
atio
n a
nd
pre
y d
ete
ctio
n.
An
thro
pog
enic
so
un
d m
ay in
terfe
re w
ith a
cou
stic
co
mm
unic
atio
n, p
reda
tor a
vo
idan
ce, p
rey
dete
ctio
n, re
pro
du
ctio
n a
nd n
avig
atio
n in
fish
. Alth
ou
gh
there
are
marin
e m
am
ma
ls a
nd fis
h
in th
e a
rea a
roun
d th
e E
&B
field
, dis
turb
an
ce fro
m n
ois
e re
su
lting fro
m d
ecom
mis
sio
nin
g
activ
ities is
exp
ecte
d to
be lo
w. T
he g
rea
test p
ote
ntia
l dis
turb
an
ce is
as a
result o
f ve
ssels
u
sin
g D
yn
am
ic P
ositio
nin
g (D
P). H
ow
eve
r, giv
en
that E
&B
are
in a
n a
rea o
f esta
blis
hed
oil
and
ga
s a
ctiv
ity, m
arin
e m
am
ma
ls a
re lik
ely
to b
e a
ccusto
me
d to
sim
ilarly
so
un
d le
ve
ls a
nd
th
is re
duce
s th
e s
eve
rity o
f imp
act.
Wa
ste
Ma
na
gem
en
t an
d R
es
ou
rce U
se
Th
e s
ubse
a in
frastru
ctu
re re
mo
ve
d fro
m th
e E
&B
field
s w
ill be tra
nsp
orte
d to
sh
ore
for re
-u
se, a
s m
ate
rials
for re
cyclin
g o
r as w
aste
for a
pp
ropria
te d
isp
osa
l. The
pote
ntia
l imp
acts
fro
m w
aste
dis
posa
l are
on th
e o
nsh
ore
enviro
nm
ent a
nd
are
prin
cip
ally
associa
ted
with
the
pote
ntia
l imp
acts
of la
ndfills
. Ove
rall, d
eco
mm
issio
nin
g p
uts
resourc
es b
ack in
to u
se th
roug
h
re-u
se o
f eq
uip
me
nt a
nd re
cyclin
g o
f mate
rials
su
ch a
s s
teel. H
ow
eve
r, wh
ere
infra
stru
ctu
re
Ettric
k a
nd
Bla
ckb
ird D
eco
mm
issio
nin
g E
IA
Do
cu
me
nt N
o. E
TR
K0
00
1-G
E-O
000-L
C-R
PT
-0006
No
ve
mb
er 2
016
P
ag
e 1
3 o
f 109
is le
ft in s
itu (e
.g. tre
nch
ed
and
burie
d flo
wlin
es a
nd
um
bilic
als
) this
ma
teria
l is e
ffectiv
ely
“lo
st”.
Ac
cid
en
tal E
ve
nts
Th
e fo
llow
ing
d
eco
mm
issio
nin
g a
ctiv
ities h
ave
b
ee
n id
en
tified a
s h
avin
g th
e p
ote
ntia
l to
re
sults
in a
n a
ccid
en
tal re
lease
of h
yd
rocarb
on
s:
· W
ell b
low
out; a
nd
· V
essel c
ollis
ion re
sultin
g in
a s
pill o
f die
sel.
Ea
ch w
ell
is fu
lly su
spe
nd
ed
w
ith tw
o p
rove
n b
arrie
rs to
th
e e
nviro
nm
ent
and
a
ll tre
e
stru
ctu
res a
re o
ve
rtraw
lable
. Th
ere
fore
, in te
rms o
f risk o
f a w
ell b
low
ou
t sca
le e
ve
nt, th
e
“like
lihoo
d” re
ma
ins lo
w, th
e s
am
e a
s u
nd
er n
orm
al o
pe
ratin
g c
ond
itions. In
add
ition, th
e
reserv
oirs
are
dep
lete
d, e
ach
we
ll has b
ee
n b
ullh
ead
ed
to p
ush
hyd
roca
rbo
n a
wa
y fro
m th
e
we
llbore
and
back in
to th
e re
serv
oir, a
nd n
o lift fo
rce
is b
ein
g a
pp
lied s
o th
e w
ells
are
not
und
er p
ressu
re. A
s a
resu
lt, the “c
onseq
uen
ce” o
f a la
rge s
ca
le re
lease
, in te
rms o
f vo
lum
e
and
rate
from
the w
ells
, is g
rea
tly re
du
ced
com
pare
d to
norm
al o
pera
tion
s w
hic
h lo
we
rs th
e
ove
rall ris
k. F
or th
e p
urp
ose
s o
f this
EIA
it is re
alis
tic to
assu
me th
at in
the e
ve
nt o
f a w
ors
t ca
se s
ce
na
rio, w
here
for e
xa
mp
le a
Xm
as T
ree
is rip
pe
d o
ff and
the c
om
ple
tion
tubin
g a
nd
Su
b S
urfa
ce S
afe
ty V
alv
e a
re d
am
ag
ed a
nd
lo
se in
teg
rity,
unco
nstra
ined
flo
wra
tes,
as
decla
red
in
th
e O
il P
ollu
tion
E
merg
ency P
lan (O
PE
P),
wo
uld
n
ot
occur
or
pers
ist.
Th
e
vo
lum
es o
f hyd
roca
rbo
ns re
lease
d fro
m a
ny o
f the w
ells
durin
g P
&A
activ
ities is
there
fore
co
nsid
ere
d to
be m
inim
al.
Ne
xe
n h
as w
ell d
eve
lop
ed p
roce
dura
l co
ntro
ls in
pla
ce to
min
imis
e th
e lik
elih
oo
d o
f rele
ases
and
to m
itiga
te th
e im
pa
cts
of re
lease
s s
hou
ld th
ey o
ccur, a
s s
et o
ut in
the E
ttrick a
rea
OP
EP
. N
exe
n h
ave
a
co
ntra
ct
with
O
il S
pill
Re
spo
nse
L
imite
d (O
SR
L).
Th
ey w
ould
b
e
mo
bilis
ed in
the e
ve
nt o
f a la
rger s
pill in
ord
er to
pro
vid
e tra
ined
pers
onne
l, eq
uip
me
nt a
nd
add
itiona
l lo
gis
tics.
Th
e O
PE
P a
lso
se
ts o
ut
the re
qu
irem
ents
fo
r sta
ff com
pete
ncy a
nd
tra
inin
g. E
me
rge
ncy C
ontro
l Exe
rcis
es a
re c
ond
ucte
d e
ve
ry th
ree y
ears
.
A v
essel c
ollis
ion c
ou
ld re
sult in
the lo
ss o
f fuel in
ve
nto
ry fro
m o
ne
of th
e v
essels
on s
ite,
how
eve
r giv
en th
at d
iese
l tend
s to
eva
po
rate
rapid
ly th
e e
nviro
nm
enta
l imp
act o
f su
ch a
re
lease
is
co
nsid
ere
d to
b
e re
lativ
ely
lo
ca
lise
d (n
o b
ea
chin
g a
nd
sh
ort
term
effe
ct).
In
add
ition
with
id
en
tified
mitig
atio
n
me
asure
s
in
pla
ce
the
like
lihoo
d
of
su
ch
an
eve
n
is
co
nsid
ere
d re
mote
.
Ea
ch
ve
ssel
used
d
urin
g
decom
mis
sio
nin
g
will
ha
ve
its
o
wn
S
hip
bo
ard
O
il P
ollu
tion
E
me
rge
ncy P
lan (S
OP
EP
). On
ly v
essels
wh
ich
me
et N
exe
n’s
assura
nce
sta
nd
ard
s w
ill be
u
sed
and
all v
esse
ls w
ill be a
ssesse
d p
rior to
the s
tart o
f the c
ontra
ct. R
isks a
sso
cia
ted
with
sim
ulta
ne
ou
s o
pera
tion
s w
ill be a
ssesse
d b
efo
re th
e d
ecom
mis
sio
nin
g a
ctiv
ities a
re c
arrie
d
out.
Th
e m
easure
s th
at a
re in
pla
ce in
the E
&B
field
s a
re c
onsid
ere
d e
ffectiv
e in
min
imis
ing th
e
risk o
f a h
yd
roca
rbo
n o
il rele
ase
du
ring
de
co
mm
issio
nin
g a
ctiv
ities to
AL
AR
P.
So
cio
-Ec
on
om
ic Im
pa
cts
Du
ring
the d
eco
mm
issio
nin
g a
ctiv
ities, a
ccess to
so
me a
rea
s a
long
the p
ipelin
es m
ay b
e
tem
pora
rily re
stric
ted w
hile
rock co
ve
r is
p
laced
. Th
e de
taile
d tim
ing a
nd
locatio
n of
the
deco
mm
issio
nin
g
opera
tions
will
be
pub
lish
ed
in
th
e
Kin
gfis
her
Bu
lletin
to
m
inim
ise
d
isru
ptio
n to
oth
er u
sers
of th
e s
ea.
Follo
win
g co
mp
letio
n o
f th
e d
eco
mm
issio
nin
g a
ctiv
ities,
Ne
xe
n w
ill co
mm
issio
n a
d
eb
ris
cle
ara
nce
sw
eep
usin
g s
pecia
lly d
esig
ned
traw
ling
eq
uip
me
nt. A
ny d
eb
ris re
trieve
d w
ill be
retu
rned
to s
hore
for re
cyclin
g/d
isp
osa
l.
Ettric
k a
nd
Bla
ckb
ird D
eco
mm
issio
nin
g E
IA
Do
cu
me
nt N
o. E
TR
K0
00
1-G
E-O
000-L
C-R
PT
-0006
No
ve
mb
er 2
016
P
ag
e 1
4 o
f 109
Th
e k
ey m
itiga
tion
in re
latio
n to
min
imis
ing
impa
cts
on fis
hin
g is
thro
ug
h th
e s
ele
ctio
n o
f a
pp
rop
riate
de
com
mis
sio
nin
g o
ptio
ns fo
r all s
eab
ed
infra
stru
ctu
re. T
his
wa
s u
nd
erta
ken
in
co
nsu
ltatio
n w
ith S
co
ttish
Fis
herm
an’s
Fed
era
tion (S
FF
) and
Ne
xe
n w
ill co
ntin
ue
to c
onsu
lt w
ith S
FF
thro
ug
hou
t the d
eco
mm
issio
nin
g w
ork
s. O
ve
r-traw
lable
stu
die
s w
ill be
und
erta
ke
n
to c
he
ck fo
r any p
ote
ntia
l sn
ag
gin
g h
aza
rds.
Follo
win
g d
eco
mm
issio
nin
g, th
e 5
00
m e
xclu
sio
n z
one
s a
rou
nd th
e D
TB
and
the E
&B
drill
ce
ntre
s, w
ill be re
linq
uis
hed
an
d th
e a
rea w
ill be m
ade
ava
ilable
for fis
hin
g.
Ove
rall
so
cio
-econ
om
ic im
pacts
in
rela
tion
to s
hip
pin
g, fis
hin
g a
nd
em
plo
ym
ent
resultin
g
from
the d
ecom
mis
sio
nin
g a
ctiv
ities a
re c
onsid
ere
d to
be lo
w.
Ettric
k a
nd
Bla
ckb
ird D
eco
mm
issio
nin
g E
IA
Do
cu
me
nt N
o. E
TR
K0
00
1-G
E-O
000-L
C-R
PT
-0006
No
ve
mb
er 2
016
P
ag
e 1
5 o
f 109
En
viro
nm
en
tal M
an
ag
em
en
t
Pro
ced
ura
l and
tech
nic
al c
ontro
ls a
nd
mitig
atio
n m
easu
res id
en
tified in
the p
rep
ara
tion o
f th
is
EIA
to
re
du
ce
imp
acts
to
a
le
ve
l th
at
is
‘as
low
a
s
reaso
na
bly
p
ractic
able
’ a
re
su
mm
aris
ed in
Tab
le 1
be
low
:
Ta
ble
1: D
ec
om
mis
sio
nin
g o
f Ettric
k a
nd
Bla
ck
bird
field
s: m
itiga
tion
me
as
ure
s
As
pe
ct
Co
mm
itmen
t
Atm
osp
he
ric e
mis
sio
ns a
nd
ene
rgy
use
· P
rior to
mo
bilis
atio
n, v
esse
ls w
ill be
se
lecte
d a
nd a
ssessed
to
ensu
re m
ain
ten
ance
of g
ene
rato
rs a
nd
eng
ines w
hic
h
lea
ds to
be
tter e
fficie
ncy in
line
with
ma
nu
factu
rer’s
sp
ecific
atio
ns; a
nd
· D
eco
mm
issio
nin
g v
essel s
ch
ed
ule
s w
ill be p
lan
ned
to
op
timis
e (m
inim
ise
) ve
ssel u
se.
Dis
cha
rges to
sea
· R
ele
ase
d c
hem
ica
ls w
ill be
perm
itted
un
de
r the
UK
Offs
ho
re
Ch
em
ica
l Re
gula
tion
s;
· C
he
mic
al ris
k a
sse
ssm
en
ts w
ill be
un
de
rtake
n in
ord
er to
o
bta
in a
pp
rova
l for u
se
of c
hem
ica
ls;
· A
ny re
lease
s o
f Na
tura
lly O
ccu
rring
Ra
dio
activ
e M
ate
rial
(NO
RM
) to s
ea
will b
e m
inim
ise
d a
nd
with
in c
urre
ntly
a
uth
oris
ed
leve
ls;
· O
pe
ratin
g p
roce
du
res a
nd
syste
ms fo
r op
timum
p
erfo
rma
nce
will b
e u
se
d to
con
trol a
nd
min
imis
e
dis
ch
arg
es fro
m v
esse
ls;
· A
ll ve
sse
ls w
ill be a
ssessed
prio
r to fin
al s
ele
ctio
n to
ensu
re
ne
cessa
ry c
ontro
ls a
re in
pla
ce
; an
d
· S
uita
ble
techn
olo
gy fo
r cu
tting th
e w
ell h
ea
ds w
ill be
se
lecte
d to
en
su
re th
e e
ffectiv
en
ess a
nd
min
imis
e th
e
du
ratio
n o
f the c
uttin
g o
pe
ratio
ns.
So
lid d
epo
sits
on
the
se
ab
ed
an
d
dis
turb
ance
to th
e s
ea
be
d
· A
ll activ
ities w
hic
h m
ay le
ad to
se
ab
ed
dis
turb
an
ce w
ill be
p
lan
ne
d, m
ana
ged
and
imp
lem
en
ted
in s
uch
a w
ay th
at
dis
turb
ance
is m
inim
ised
;
· A
se
abe
d s
urv
ey w
ill be
ca
rried
ou
t an
d d
eta
iled
anch
orin
g
pla
ns fo
r the
drillin
g rig
will b
e p
ut in
pla
ce;
· R
ock p
lace
me
nt w
ill on
ly b
e u
nd
erta
ke
n in
limite
d a
rea
s fo
r th
e p
ipe
lines w
hic
h a
re re
main
ing
in s
itu, a
nd
in lin
e w
ith th
e
op
tion
s s
ele
cte
d a
t the c
om
pa
rativ
e a
ssessm
ent;
· A
fall p
ipe
will b
e u
se
d to
dire
ct th
e ro
ck c
ove
r to th
e c
orre
ct
locatio
n;
· C
are
ful p
lan
nin
g, s
ele
ctio
n o
f eq
uip
men
t, an
d m
an
ag
em
en
t a
nd
imp
lem
en
tatio
n o
f activ
ities (e
sp
ecia
lly w
ate
r-jettin
g);
· A
ll dro
pp
ed
obje
cts
will b
e re
po
rted
to B
EIS
via
a P
etro
leum
O
pe
ratio
ns N
otic
e (P
ON
) 2 a
nd
Ne
xe
n w
ill aim
to re
co
ve
r all
dro
pp
ed
obje
cts
; an
d
· A
de
bris
su
rve
y w
ill be
un
de
rtake
n a
t the
co
mple
tion
of th
e
de
com
mis
sio
nin
g. A
ny d
eb
ris m
ate
rial, id
en
tified
as
resu
lting fro
m d
ecom
mis
sio
nin
g a
ctiv
ities w
ill be
reco
ve
red
fro
m th
e s
ea
be
d w
he
re p
ossib
le. T
ho
se
no
t reco
ve
red
will
be
en
tere
d in
to th
e F
ish
Sa
fe d
ata
base
.
Un
de
rwa
ter n
ois
e
· V
esse
l use
will b
e o
ptim
ise
d; a
nd
· C
uttin
g lo
ca
tion
s a
nd p
roce
du
res id
en
tified
in o
rde
r to
min
imis
e n
um
be
r an
d d
ura
tion o
f ope
ratio
ns.
Waste
man
age
men
t an
d re
sou
rce
u
se
· W
here
po
ssib
le, m
ate
rials
will b
e re
cycle
d o
r so
ld a
nd
reu
sed
;
· W
aste
man
age
men
t op
tion
s w
ill take a
cco
un
t of th
e w
aste
Ettric
k a
nd
Bla
ckb
ird D
eco
mm
issio
nin
g E
IA
Do
cu
me
nt N
o. E
TR
K0
00
1-G
E-O
000-L
C-R
PT
-0006
No
ve
mb
er 2
016
P
ag
e 1
6 o
f 109
As
pe
ct
Co
mm
itmen
t
hie
rarc
hy;
· E
xis
ting w
aste
dis
posal ro
ute
s a
nd
co
ntra
cto
rs w
ill be
use
d
wh
ere
po
ssib
le;
· S
eg
reg
atin
g m
ate
rials
at s
ou
rce
an
d m
ain
tain
ing
this
se
pa
ratio
n b
etw
ee
n h
aza
rdous a
nd
non
-ha
za
rdou
s w
aste
stre
am
s w
ill red
uce
the
am
ou
nt o
f ma
teria
l req
uirin
g
trea
tme
nt o
nsh
ore
;
· If h
aza
rdou
s w
aste
is p
rodu
ced
it will b
e p
re-tre
ate
d to
re
du
ce
d h
aza
rdo
us p
rop
ertie
s o
r, wh
ere
possib
le re
nde
r it n
on
-ha
za
rdo
us; a
nd
· N
OR
M c
on
tam
ina
ted
equ
ipm
en
t will b
e h
an
dle
d,
tran
sp
orte
d, s
tore
d a
nd d
isp
ose
d o
f in a
con
trolle
d m
an
ne
r. P
roto
co
ls w
ill be
in p
lace
to e
nsu
re th
at e
qu
ipm
en
t is n
ot
rele
ase
d o
r han
dle
d w
itho
ut c
on
trols
to p
rote
ct th
e w
ork
er
an
d p
reve
nt c
on
tam
ina
tion
of th
e e
nviro
nm
en
t.
Accid
en
tal e
ve
nts
· O
nly
ve
sse
ls w
hic
h m
eet N
exe
n’s
vessel a
ssu
ran
ce
sta
nd
ard
s w
ill be
use
d;
· E
ach
ve
ssel u
se
d d
urin
g d
ecom
mis
sio
nin
g w
ill ha
ve
its o
wn
S
hip
boa
rd O
il Po
llutio
n E
me
rge
ncy P
lan
; and
· N
exe
n h
ave
a c
ontra
ct in
pla
ce
with
Oil S
pill R
esp
on
se
Lim
ited
.
So
cio
-econ
om
ic im
pa
cts
· S
ele
ctio
n o
f ap
pro
pria
te d
ecom
mis
sio
nin
g o
ptio
ns fo
r all
se
abe
d in
frastru
ctu
re; a
nd
· O
ve
r-traw
lab
le s
tud
ies w
ill be
un
de
rtaken
to c
he
ck fo
r an
y
po
ten
tial s
na
ggin
g h
aza
rds.
Co
nc
lus
ion
Th
is
EIA
h
as
assesse
d
the
imp
acts
a
nd
risks
associa
ted
w
ith
the
pro
po
sed
deco
mm
issio
nin
g a
ctiv
ities in
the c
onte
xt o
f the e
nviro
nm
ent w
ithin
wh
ich
the E
&B
field
s a
nd
infra
stru
ctu
re a
re s
ituate
d. W
ith im
ple
me
nta
tion
of th
e p
ropo
sed
mitig
atio
n m
easure
s, th
e
enviro
nm
enta
l imp
act o
f the re
mo
va
l of th
e fa
cilitie
s is
like
ly to
be te
mp
ora
ry w
ith re
ga
rd to
d
istu
rbe
d s
eab
ed
with
in th
e p
roje
ct fo
otp
rint. R
eco
ve
ry o
f the S
eab
ed
is e
xp
ecte
d to
beg
in
imm
edia
tely
o
n co
mp
letio
n o
f th
e a
ctiv
ities.
Ro
ck p
laced
o
ve
r cu
t p
ipe
e
nd
s a
nd
sh
ort
leng
ths of
exp
ose
d p
ipelin
es to
m
ake
th
e se
ab
ed
safe
fo
r fis
hin
g w
ill h
ave
a
lo
ng
-term
p
rese
nce, b
ut w
ill be v
ery
limite
d in
exte
nt. T
he p
ropo
sed
app
roa
ch
to d
eco
mm
issio
nin
g th
e
E&
B fa
cilitie
s w
ill rem
ove
ma
n-m
ade s
tructu
res fro
m th
e s
eab
ed, le
avin
g it in
a c
ond
ition
su
itable
fo
r re
-co
lonis
atio
n
by
local
sp
ecie
s
and
safe
fo
r fis
herm
en.
Ettric
k a
nd
Bla
ckb
ird D
eco
mm
issio
nin
g E
IA
Do
cu
me
nt N
o. E
TR
K0
00
1-G
E-O
000-L
C-R
PT
-0006
No
ve
mb
er 2
016
P
ag
e 1
7 o
f 109
AB
BR
EV
IAT
ION
S
AH
V
An
ch
or H
an
dlin
g V
esse
l
AL
AR
P
As L
ow
As R
easo
na
bly
Possib
le
BE
IS
De
pa
rtme
nt fo
r Busin
ess, E
nerg
y a
nd
In
dustria
l Stra
teg
y
BO
D
Bio
che
mic
al O
xyg
en
De
man
d
BO
DC
B
ritish
Oce
an
og
rap
hic
Data
Ce
ntre
CA
C
om
pa
rativ
e A
ssessm
en
t
CIT
ES
C
on
ve
ntio
n o
n In
tern
atio
nal T
rad
e in
E
nd
an
ge
red
Sp
ecie
s
CH
4 m
eth
an
e
CN
S
Ce
ntra
l North
SE
A
CO
P
Ce
ssatio
n o
f Pro
ductio
n
CO
2 ca
rbon
dio
xid
e
CO
2e
C
O2 e
qu
iva
len
t
cS
AC
ca
ndid
ate
SA
C
CS
V
Co
nstru
ctio
n S
up
po
rt Ve
sse
l
CtL
C
on
se
nt to
Lo
ca
te
dB
d
ecib
els
DC
M
Drill C
entre
Ma
nifo
ld
DE
CC
D
ep
artm
en
t of E
ne
rgy a
nd
Clim
ate
C
ha
ng
e
DE
FR
A
De
pa
rtme
nt fo
r En
viro
nm
en
t, Fis
he
ries
an
d R
ura
l Affa
irs
Do
C
De
pth
of C
ove
r
Do
L
De
pth
of L
ine
DP
D
yn
am
ic P
ositio
nin
g
dS
AC
d
raft S
AC
DS
V
Div
e S
up
po
rt Ve
sse
l
DT
B
Dis
con
necta
ble
Tu
rret B
uo
y
EC
E
uro
pe
an
Com
mis
sio
n
ED
CM
E
ttrick D
rill Ce
ntre
Ma
nifo
ld
EIA
E
nviro
nm
en
tal Im
pa
ct A
ssessm
en
t
EN
VID
E
nviro
nm
en
tal Im
pa
ct Id
en
tifica
tion
EP
S
Eu
rop
ean
Pro
tecte
d S
pe
cie
s
EU
E
uro
pe
an
Un
ion
FP
SO
F
loa
ting
, Pro
ductio
n, O
ffloa
din
g a
nd
S
tora
ge
GE
AD
G
old
en
Ea
gle
Are
a D
evelo
pm
en
t
GW
P
Glo
ba
l Warm
ing
Po
tentia
l
HS
E&
SR
H
ea
lth, S
afe
ty, E
nviro
nm
en
t & S
ocia
l R
esp
onsib
ility
ICE
S
Inte
rnatio
na
l Cou
ncil fo
r the
E
xp
lora
tion
of th
e S
ea
s
IHM
In
ve
nto
ry o
f Ha
za
rdo
us M
ate
rials
IoP
In
stitu
te o
f Petro
leu
m G
uid
elin
es
JN
CC
Jo
int N
atu
re C
onse
rva
tion
Com
mitte
e
kH
z
kilo
-he
rtz
km
kilo
me
tres
LS
A
Lo
w S
pe
cific
Activ
ity
m
Me
tres
m2
sq
ua
re m
etre
s
MA
T
Ma
ste
r Ap
plic
atio
n T
em
pla
te
MC
AA
M
arin
e a
nd
Co
asta
l Access A
ct
MD
AC
M
eth
an
e D
eriv
ed
Au
thig
en
ic
Ca
rbo
na
te
ME
G
Mo
no
eth
yle
ne
Gly
col
mm
m
illime
tres
MP
A
Ma
rine
Pro
tecte
d A
rea
MS
V
Mu
ltipu
rpo
se
Su
pp
ort V
esse
l
MW
A
Mid
Wa
ter A
rch
NO
x
Nitro
ge
n O
xid
es
N2 O
N
itrou
s O
xid
e
NC
MP
A
Na
ture
Co
nse
rva
tion
Ma
rine
Pro
tecte
d
Are
a
nm
n
au
tica
l mile
NN
S
No
rthe
rn N
orth
Sea
NO
RM
N
atu
rally
Occu
rring
Rad
ioa
ctiv
e
Ma
teria
l
OB
M
Oil B
ase
d M
ud
OC
R
Offs
ho
re C
he
mic
als
Re
gula
tion
s
OC
NS
O
ffsh
ore
Ch
em
ica
ls N
otific
atio
n
Sch
em
e
OP
EP
O
il Po
llutio
n E
me
rgen
cy P
lan
OP
PC
O
il Po
llutio
n P
reve
ntio
n a
nd C
on
trol
OS
CA
R
Oil S
pill C
on
tinge
ncy a
nd
Resp
on
se
OS
PA
R
Oslo
an
d P
aris
Con
ve
ntio
n fo
r the
p
rote
ctio
n o
f the
Ma
rine
en
viro
nm
ent
of th
e N
orth
Ea
st A
tlantic
OS
RL
O
il Sp
ill Resp
onse
Lim
ited
OV
I O
ffsh
ore
Vu
lne
rability
Ind
ex
P&
A
Plu
g a
nd
Aba
nd
on
me
nt
PA
H
Po
lycyclic
Aro
ma
tic H
yd
roca
rbo
ns
Ettric
k a
nd
Bla
ckb
ird D
eco
mm
issio
nin
g E
IA
Do
cu
me
nt N
o. E
TR
K0
00
1-G
E-O
000-L
C-R
PT
-0006
No
ve
mb
er 2
016
P
ag
e 1
8 o
f 109
PE
TS
P
orta
l En
viro
nm
en
tal T
rackin
g S
yste
m
PL
EM
P
ipe
line
En
d M
an
ifold
PL
ON
OR
P
oses L
ittle O
r No R
isk
PM
F
Prio
rity M
arin
e F
eatu
res
PO
N
Pe
trole
um
Ope
ratio
ns N
otic
e
pp
t p
arts
pe
r tho
usa
nd
pS
AC
p
ossib
le S
AC
pM
PA
P
ossib
le M
PA
rms
ro
ot-m
ea
n-s
qua
re
RO
V
Re
mo
tely
Op
era
ted
Ve
hic
le
SA
C
Sp
ecia
l Are
a o
f Co
nse
rva
tion
SA
GE
S
co
ttish
Are
a G
as E
va
cua
tion
SC
I S
ite o
f Co
mm
unity
Impo
rtance
SD
U
Su
bsea
Dis
tribu
tion
Un
it
SF
F
Sco
ttish
Fis
he
rma
n’s
Fe
de
ratio
n
SN
H
Sco
ttish
Natu
ral H
erita
ge
SN
S
So
uth
ern
No
rth S
ea
SO
2
Su
lph
ur D
ioxid
e
SO
PE
P
Sh
ipb
oa
rd O
il Po
llutio
n E
me
rge
ncy
Pla
n
SP
A
Sp
ecia
l Pro
tectio
n A
rea
SP
L
So
un
d p
ressu
re le
ve
l
SS
IV
Su
bsea
Sa
fety
Isola
tion
Valv
e
SS
S
Sid
e S
ca
n S
on
ar
Te
T
on
ne
s
TO
C
To
tal o
rgan
ic c
arb
on
TO
M
To
tal O
rga
nic
Ma
tter
UK
CS
U
nite
d K
ingd
om
Co
ntin
en
tal S
he
lf
UK
MS
U
nite
d K
ingd
om
Ma
na
gem
en
t Syste
m
UK
OO
A
Un
ited
Kin
gd
om
Offs
ho
re O
pera
tions
Associa
tion (n
ow
kn
ow
n a
s O
il an
d
Ga
s U
K)
VM
S
Ve
sse
l Mo
nito
ring
Syste
ms
VO
C
Vo
latile
Org
an
ic C
om
po
und
WF
D
Waste
Fra
me
wo
rk D
irectiv
e
WE
EE
W
aste
Ele
ctric
al a
nd E
lectro
nic
E
qu
ipm
en
t
WI
Wate
r Inje
ctio
n
WM
P
Waste
Ma
na
ge
men
t Pla
n
µP
a
mic
rop
asca
l
Ettric
k a
nd
Bla
ckb
ird D
eco
mm
issio
nin
g E
IA
Do
cu
me
nt N
o. E
TR
K0
00
1-G
E-O
000-L
C-R
PT
-0006
No
ve
mb
er 2
016
P
ag
e 1
9 o
f 109
IN
TR
OD
UC
TIO
N
1.0
Th
e E
ttrick a
nd B
lackb
ird (E
&B
) field
s lie
in th
e O
ute
r Mo
ray F
irth A
rea in
the C
entra
l No
rth
Se
a (C
NS
) and a
re o
pera
ted
by N
exe
n P
etro
leum
(UK
) Ltd
(here
afte
r refe
rred to
as N
exe
n).
Ne
xe
n h
as p
rep
are
d th
is E
nviro
nm
enta
l Imp
act A
sse
ssm
ent (E
IA) u
nd
er th
e P
etro
leum
Act
1998, in
su
pp
ort o
f four d
raft D
ecom
mis
sio
nin
g P
rogra
mm
es (c
olle
ctiv
ely
refe
rred to
here
as
the E
&B
dra
ft De
com
mis
sio
nin
g P
rog
ram
me
s) th
at a
re b
ein
g s
ubm
itted to
the D
epa
rtme
nt
for B
usin
ess, E
nerg
y a
nd
Indu
stria
l Stra
teg
y (B
EIS
), form
erly
kn
ow
n a
s th
e D
epa
rtme
nt o
f E
nerg
y a
nd
Clim
ate
Ch
an
ge
(DE
CC
), to s
eek a
pp
rova
l for th
e a
ctiv
ities a
sso
cia
ted
with
the
deco
mm
issio
nin
g o
f the
:
(1) E
ttrick in
sta
llatio
ns;
(2) E
ttrick p
ipelin
es;
(3) B
lackb
ird in
sta
llatio
ns; a
nd
(4) B
lackb
ird p
ipelin
es.
1.1
P
roje
ct B
ack
gro
un
d
Th
e E
&B
field
s lie
with
in Q
uad
rants
20/2
a a
nd
20/3
a in
the O
ute
r Mo
ray F
irth A
rea c
.120 k
m
north
ea
st o
f Ab
erd
ee
n in
110
m w
ate
r dep
th (F
igure
1-1
) and w
ere
pro
du
ced
via
the A
oka
Miz
u F
loatin
g P
rodu
ctio
n S
tora
ge
and O
ffload
ing
(FP
SO
) ve
ssel. P
roductio
n fro
m th
e E
&B
fie
lds c
ease
d in
Ju
ne
201
6 a
nd
the F
PS
O w
ent o
ffsta
tion
on 1
st A
ug
ust 2
01
6.
Bo
th fie
lds w
ere
pre
dom
inan
tly o
il reserv
oirs
with
the F
PS
O p
rovid
ing
pro
ce
ssin
g c
apa
bility
. T
he o
il wa
s s
tore
d o
n th
e F
PS
O a
nd
batc
h e
xp
orte
d v
ia a
sh
uttle
tanke
r, wh
ilst th
e g
as w
as
exp
orte
d v
ia a
ga
s e
xp
ort ris
er a
nd
pip
elin
e s
yste
m c
onn
ecte
d to
the S
co
ttish
Are
a G
as
Eva
cua
tion
(SA
GE
) pip
elin
e. W
ate
r Inje
ctio
n (W
I) and
gas lift w
ere
ava
ilable
to b
oth
field
s
via
su
bse
a p
ipelin
es a
nd
infra
stru
ctu
re.
Ta
ble
1-1
sh
ow
s th
e in
tere
sts
held
by e
ach p
artn
er in
ea
ch fie
ld.
Ta
ble
1-1
: Ow
ne
rsh
ip o
f the E
ttrick
an
d B
lac
kb
ird fie
lds
.
Fie
ld p
artn
ers
%
ow
ne
rsh
ip
Ettric
k fie
ld in
tere
sts
Ne
xe
n
80
%
Da
na
Pe
trole
um
(BV
UK
) Ltd
1
2 %
Atla
ntic
Petro
leu
m
8 %
Bla
ck
bird
field
inte
res
ts
Ne
xe
n
90
.6 %
Atla
ntic
Petro
leu
m
9.4
%
Ettric
k a
nd
Bla
ckb
ird D
eco
mm
issio
nin
g E
IA
Do
cu
me
nt N
o. E
TR
K0
00
1-G
E-O
000-L
C-R
PT
-0006
No
ve
mb
er 2
016
P
ag
e 2
0 o
f 109
Fig
ure
1-1
: Lo
ca
tion
of th
e E
ttrick
an
d B
lac
kb
ird fie
ld.
1.2
P
urp
ose
of T
his
Do
cu
men
t
Un
de
r Se
ctio
n 6
of th
e D
ecom
mis
sio
nin
g o
f Offs
ho
re O
il and
Ga
s In
sta
llatio
ns a
nd
Pip
elin
es
und
er P
etro
leum
Act 1
99
8 G
uid
an
ce N
ote
s (D
EC
C, 2
01
1) th
ere
is a
req
uire
me
nt fo
r an E
IA
to b
e c
arrie
d o
ut fo
r the
se
lecte
d d
ecom
mis
sio
nin
g o
ptio
ns. T
his
docum
ent p
rese
nts
the
results
of th
at E
IA.
Th
e E
IA id
en
tifies th
ose
activ
ities lik
ely
to h
ave
an
enviro
nm
enta
l imp
act. A
n E
NV
ironm
enta
l Im
pact ID
entific
atio
n (E
NV
ID) w
ork
sh
op w
as u
nd
erta
ke
n to
dis
cu
ss th
e p
rop
osed
activ
ities
and
their p
ote
ntia
l enviro
nm
enta
l aspe
cts
(e.g
. em
issio
ns to
air, d
isch
arg
es to
se
a, s
eab
ed
dis
turb
an
ce,
und
erw
ate
r n
ois
e
and
w
aste
). T
he
w
ork
sh
op
a
lso
id
en
tified
the
mitig
atio
n
me
asu
res
that
will
be
used
to
re
du
ce
the
enviro
nm
enta
l im
pact
asso
cia
ted
w
ith
these
a
spe
cts
. So
cio
-econ
om
ic im
pacts
we
re a
lso
con
sid
ere
d in
the E
NV
ID a
nd
are
ca
ptu
red in
th
is E
IA.
1.3
R
eg
ula
tory
Co
nte
xt
Th
e U
K’s
inte
rnatio
na
l oblig
atio
ns o
n d
eco
mm
issio
nin
g a
re g
ove
rne
d p
rincip
ally
by th
e 1
99
2
Co
nve
ntio
n fo
r th
e P
rote
ctio
n of
the M
arin
e E
nviro
nm
ent
of
the N
orth
E
ast
Atla
ntic
(th
e
OS
PA
R
Co
nve
ntio
n,
OS
PA
R
199
2).
Th
e
UK
’s
inte
rnatio
na
l o
blig
atio
ns
on
the
deco
mm
issio
nin
g of
offs
hore
in
sta
llatio
ns a
re se
t o
ut
in O
SP
AR
D
ecis
ion 9
8/3
(O
SP
AR
1
99
8), h
ow
eve
r, pip
elin
es a
nd
um
bilic
als
are
not in
clu
de
d in
this
De
cis
ion.
In
the
UK
, d
ecom
mis
sio
nin
g
is
reg
ula
ted
b
y
BE
IS
und
er
the
Pe
trole
um
A
ct
199
8
as
am
en
ded
by th
e E
nerg
y A
ct 2
00
8 s
uch th
at th
e d
eco
mm
issio
nin
g o
f pip
elin
es m
ust s
atis
fy
the re
qu
irem
ents
of th
e P
etro
leum
Act, 1
99
8. P
ipelin
es a
re a
ssesse
d o
n a
ca
se
-by-c
ase
Ettric
k a
nd
Bla
ckb
ird D
eco
mm
issio
nin
g E
IA
Do
cu
me
nt N
o. E
TR
K0
00
1-G
E-O
000-L
C-R
PT
-0006
No
ve
mb
er 2
016
P
ag
e 2
1 o
f 109
basis
a
nd
a
ll fe
asib
le d
eco
mm
issio
nin
g o
ptio
ns sh
ou
ld b
e co
nsid
ere
d a
nd
in
clu
de
d in
a
co
mp
ara
tive
a
ssessm
ent
(CA
). T
he
CA
m
ust
take
a
ccou
nt
the
safe
ty,
enviro
nm
enta
l, te
chn
ica
l, so
cie
tal a
nd
co
st c
onsid
era
tion
s o
f the fe
asib
le o
ptio
ns. C
ost im
pact m
ay o
nly
be
co
nsid
ere
d a
dete
rmin
ing
facto
r wh
en
all o
the
r crite
ria e
merg
e a
s e
qu
al.
As
note
d
in
Se
ctio
n
12.1
of
the
BE
IS
Gu
idan
ce
No
tes
(DE
CC
, 2
01
1),
the
dra
ft D
ecom
mis
sio
nin
g P
rog
ram
me
s m
ust b
e s
upp
orte
d b
y a
n E
IA. T
he G
uid
an
ce N
ote
s s
tate
th
at a
n E
IA s
hou
ld in
clu
de
an
assessm
ent o
f:
· A
ll p
ote
ntia
l im
pacts
on
th
e
ma
rine
e
nviro
nm
ent
inclu
din
g
exp
osu
re
of
bio
ta
to
co
nta
min
ants
, bio
log
ica
l imp
acts
aris
ing fro
m p
hysic
al e
ffects
, and
co
nflic
ts w
ith th
e
co
nse
rva
tion
of s
pecie
s a
nd
their h
ab
itats
;
· P
ote
ntia
l im
pacts
o
n
enviro
nm
enta
l co
mp
artm
ents
, in
clu
din
g
em
issio
ns
to
the
atm
osph
ere
an
d d
isch
arg
es to
se
a;
· C
onsu
mp
tion o
f natu
ral re
sou
rce
s a
nd
en
erg
y a
sso
cia
ted
with
reuse a
nd
recyclin
g;
· In
terfe
rence
with
oth
er le
gitim
ate
use
rs o
f the s
ea a
nd
oth
er c
onseq
ue
ntia
l effe
cts
on
the p
hysic
al e
nviro
nm
ent; a
nd
· P
ote
ntia
l imp
acts
on a
me
nitie
s, th
e a
ctiv
ities o
f co
mm
unitie
s a
nd
on fu
ture
uses o
f th
e e
nviro
nm
ent.
Un
de
r the M
arin
e a
nd
Co
asta
l Acce
ss A
ct 2
00
9 (M
CA
A) (H
er M
aje
sty
’s (H
M) G
ove
rnm
ent,
200
9) a
lice
nce
app
lica
tion
will b
e re
qu
ired a
t the tim
e o
f deco
mm
issio
nin
g c
aptu
ring
the
deta
il of a
ll the p
ropo
sed a
ctiv
ities a
nd
assessin
g th
eir im
pact.
Oth
er re
leva
nt le
gis
latio
n in
clu
de
s:
· T
he O
ffsh
ore
Petro
leum
Activ
ities (C
onse
rva
tion
of H
abita
ts) R
eg
ula
tions 2
00
1 (H
M
Go
ve
rnm
ent, 2
00
1);
· T
he O
ffsho
re C
hem
ica
ls R
eg
ula
tion
s 2
00
2 (H
M G
ove
rnm
ent, 2
00
2);
· T
he O
ffsh
ore
P
etro
leum
A
ctiv
ities (O
il P
ollu
tion
P
reve
ntio
n a
nd
C
ontro
l (O
PP
C))
Re
gu
latio
ns 2
00
5 (H
M G
ove
rnm
ent, 2
00
5b
) and a
s a
me
nd
ed 2
01
1 ;
· T
he M
erc
ha
nt
Sh
ippin
g (O
il P
ollu
tion
P
repa
red
ness,
Re
spo
nse
a
nd
C
o-o
pera
tion
Co
nve
ntio
n) R
eg
ula
tion
s 1
99
8 (re
qu
iring
an O
il Po
llutio
n E
me
rge
ncy P
lan
(OP
EP
)) (H
M G
ove
rnm
ent, 1
99
8);
· T
he O
ffsh
ore
P
etro
leum
P
rodu
ctio
n a
nd
P
ipelin
es (A
sse
ssm
ent
of
En
viro
nm
enta
l E
ffects
) Reg
ula
tion
s 1
999
(HM
Go
ve
rnm
ent, 1
999
);
· E
nviro
nm
enta
l Pro
tectio
n A
ct 1
99
0 (H
M G
ove
rnm
ent, 1
99
0);
· S
pecia
l Waste
Re
gu
latio
ns 1
99
6 (H
M G
ove
rnm
en
t, 199
6);
· H
aza
rdo
us W
aste
(En
gla
nd
and
Wa
les) R
eg
ula
tions 2
00
5 (H
M G
ove
rnm
ent, 2
00
5a);
and
· T
ran
s-fro
ntie
r Sh
ipm
ent o
f Waste
Reg
ula
tion
s (H
M G
ove
rnm
ent, 2
00
7);
Cro
ss-b
ou
nd
ary
co
op
era
tion
betw
een
the U
K a
nd
No
rwa
y w
ith re
ga
rd to
pe
trole
um
activ
ities
is co
ve
red
b
y a
F
ram
ew
ork
A
gre
em
ent
(Ap
ril 2
00
5,
ente
red
in
to fo
rce
Ju
ly 2
00
7).
The
agre
em
ent s
tate
s th
at w
ith re
spe
ct to
deco
mm
issio
nin
g, p
lans a
re s
ubje
ct to
the a
ppro
va
l of
the G
ove
rnm
ent o
n w
hose
co
ntin
en
tal s
helf o
r in w
hose
territo
rial w
ate
rs th
e in
sta
llatio
n is
situ
ate
d,
afte
r fu
ll co
nsu
ltatio
n w
ith th
e oth
er
Go
ve
rnm
ent.
Th
ere
a
re n
o cro
ss-b
ou
nd
ary
p
ipelin
es a
nd
th
e E
&B
fie
lds a
re c.1
42 km
a
wa
y fro
m N
orw
eg
ian w
ate
rs,
there
fore
no
co
nsu
ltatio
n
with
th
e
No
rwe
gia
n
Go
ve
rnm
ent
wo
uld
b
e
req
uire
d.
Ho
we
ve
r, a
ny
transb
ou
nd
ary
imp
acts
do
nee
d to
be c
onsid
ere
d in
the E
IA (e
.g. o
il sp
ill mo
de
lling
). An
y
wa
ste
sh
ippe
d to
a c
oun
try o
ther th
an
the U
K c
om
es u
nd
er th
e T
ran
s-fro
ntie
r Sh
ipm
ent o
f W
aste
Reg
ula
tion
s a
s lis
ted a
bo
ve
.
Ettric
k a
nd
Bla
ckb
ird D
eco
mm
issio
nin
g E
IA
Do
cu
me
nt N
o. E
TR
K0
00
1-G
E-O
000-L
C-R
PT
-0006
No
ve
mb
er 2
016
P
ag
e 2
2 o
f 109
1.4
S
takeh
old
er C
on
sid
era
tion
Co
nsu
lting
with
sta
ke
ho
lders
is a
n im
porta
nt p
art o
f the d
ecom
mis
sio
nin
g E
IA p
rocess. It
allo
ws a
ny co
nce
rns o
r is
su
es w
hic
h sta
ke
ho
lders
m
ay h
ave
, to
b
e co
mm
unic
ate
d a
nd
add
resse
d. T
able
1-2
sum
maris
es th
e in
form
al s
take
ho
lder e
ng
ag
em
ent p
roce
ss u
nd
erta
ke
n
to
date
. S
tatu
tory
co
nsu
ltees
have
been
en
gag
ed
e
arly
o
n
in
the
life
of
the
E
&B
D
ecom
mis
sio
nin
g p
roje
ct
and
w
ere
in
vite
d to
p
artic
ipate
to
th
e com
para
tive
a
ssessm
ent
exe
rcis
e to
ensure
their re
com
me
nd
atio
ns w
ere
take
n in
to c
onsid
era
tion
at th
e e
arly
sta
ges
of th
e p
roje
ct. S
ectio
n 2
.5.1
sum
maris
es th
e fin
din
gs fro
m th
e C
A. It is
wo
rth h
igh
lightin
g th
at
as p
art o
f this
info
rma
l co
nsu
ltatio
n p
ha
se n
o m
ajo
r co
nce
rn o
r outs
tan
din
g is
su
es w
ere
ra
ise
d.
It is w
orth
hig
hlig
htin
g th
at a
s p
art o
f this
pre
-con
sulta
tion
sta
ge
no c
once
rn o
r outs
tand
ing
is
su
es h
ave
be
en ra
ise
d.
Th
e fo
rma
l sta
tuto
ry a
nd
pub
lic c
onsu
ltatio
n p
roce
ss w
ill be trig
gere
d b
y th
e s
ubm
issio
n o
f th
e
co
nsu
ltatio
n
dra
ft of
the
De
com
mis
sio
nin
g
Pro
gra
mm
es
and
su
pp
ortin
g
docu
me
nts
(in
clu
din
g th
is E
IA re
port) to
BE
IS.
Ta
ble
1-2
: Th
ird p
arty
co
ns
ulta
tion
s.
Co
ns
ulte
e
Da
te
De
sc
riptio
n
Ma
rine
Sco
tlan
d (M
S)
12
th Ju
ne 2
014
Pro
ject b
rief a
he
ad o
f Com
pa
rativ
e A
sse
ssm
en
t
MS
, Sco
ttish
Fis
he
rme
n’s
F
ed
era
tion (S
FF
) Jo
int N
atu
re
Co
nse
rva
tion
Com
mitte
e
(JN
CC
)
17
th Ju
ne 2
014
Co
mp
ara
tive
Assessm
en
t
JN
CC
5
th No
ve
mbe
r 201
5
Pro
ject u
pd
ate
mee
ting
SF
F
23
rd No
vem
be
r 20
15
Pro
ject u
pd
ate
mee
ting
MS
1
st D
ecem
be
r 201
5
Pro
ject u
pd
ate
mee
ting
JN
CC
3
rd Ma
y 2
01
6
Pre
-Co
P u
pda
te m
eetin
g
1.5
E
nviro
nm
en
tal M
an
ag
em
en
t
Ne
xe
n is
co
mm
itted to
co
nd
uctin
g a
ctiv
ities in
co
mp
liance
with
all a
pp
lica
ble
leg
isla
tion
and
in
a m
ann
er th
at w
ill min
imis
e im
pacts
on th
e e
nviro
nm
ent. T
he p
rop
osed
deco
mm
issio
nin
g
activ
ities w
ill be d
eliv
ere
d in
co
mp
liance
with
Ne
xe
n’s
En
viro
nm
enta
l Ma
na
gem
ent S
yste
m
wh
ich
ha
s b
ee
n d
eve
lope
d to
alig
n w
ith th
e B
ritish
Sta
nd
ard
, BS
EN
ISO
140
01
.
Th
e h
igh
leve
l He
alth
, Safe
ty, E
nviro
nm
ent &
Socia
l Re
spo
nsib
ility (H
SE
&S
R) o
bje
ctiv
es o
f th
e p
roje
ct w
ill co
mp
ly w
ith a
ll sa
fety
and
enviro
nm
enta
l leg
isla
tion
app
lica
ble
to U
K o
ffsh
ore
d
eve
lopm
ents
; and w
ill co
mp
ly w
ith N
exe
n’s
Co
rpo
rate
and
UK
HS
E&
SR
Po
licie
s.
Ne
xe
n
ope
rate
s
a
form
alis
ed
UK
M
ana
ge
me
nt
Syste
m
(UK
MS
). H
ealth
, S
afe
ty
and
E
nviro
nm
enta
l Ma
na
ge
me
nt is
inte
gra
ted fu
lly in
to th
e U
KM
S F
ram
ew
ork
.
Th
e H
ealth
, Safe
ty a
nd
En
viro
nm
enta
l Ma
na
ge
me
nt e
lem
en
t of N
exe
n’s
UK
MS
is c
om
po
se
d
of n
ine c
om
mitm
ents
, as fo
llow
s:
1.
Iden
tify a
nd
co
ntro
l co
nditio
ns, b
eh
avio
urs
and
pro
cesse
s th
at c
ould
pose h
aza
rds
to p
ers
onn
el, m
em
bers
of th
e p
ub
lic, th
e e
nviro
nm
ent o
r Th
e C
om
pan
y p
rope
rty;
Ettric
k a
nd
Bla
ckb
ird D
eco
mm
issio
nin
g E
IA
Do
cu
me
nt N
o. E
TR
K0
00
1-G
E-O
000-L
C-R
PT
-0006
No
ve
mb
er 2
016
P
ag
e 2
3 o
f 109
2.
Effe
ctiv
e m
anag
em
ent o
f incid
en
t repo
rting, in
ve
stig
atio
n a
nd c
orre
ctio
n;
3.
Ap
ply
the p
rincip
les o
f risk-b
ase
d P
rocess S
afe
ty M
ana
ge
me
nt o
n a
ll assets
;
4.
Effe
ctiv
e m
anag
em
ent o
f une
xp
ecte
d e
me
rge
ncy e
ve
nts
to m
inim
ise
their im
pacts
;
5.
Me
asu
re H
ealth
Sa
fety
and
En
viro
nm
ent p
erfo
rma
nce
to e
nsu
re c
om
plia
nce
with
sta
ted re
qu
irem
ents
;
6.
Pro
mote
a s
afe
and
hea
lthy w
ork
ing
enviro
nm
ent, a
nd
pre
ve
nt o
ccup
atio
na
l inju
ries
and
illnesse
s;
7.
Co
mm
unic
ate
He
alth
, Safe
ty a
nd
En
viro
nm
ent in
form
atio
n to
pers
onn
el;
8.
Effe
ctiv
ely
m
ana
ge
e
mis
sio
ns,
wa
ste
a
nd
e
nviro
nm
enta
l lia
bilitie
s re
sultin
g fro
m
their a
ctiv
ities th
roug
hout th
e life
of fie
ld o
pera
tions; a
nd
9.
Pa
rticip
ate
in in
du
stry
Hea
lth S
afe
ty a
nd
En
viro
nm
enta
l initia
tive
s.
Th
e P
roje
ct h
as e
sta
blis
hed
an a
pp
roa
ch
to ris
k m
anag
em
ent, w
here
by th
e d
esig
n a
ims to
e
limin
ate
, p
reve
nt,
co
ntro
l a
nd
o
nly
th
en
m
itigate
id
en
tified
HS
E&
SR
ris
ks.
Em
erg
ency
respo
nse
m
easu
res sha
ll b
e im
ple
me
nte
d in
lin
e w
ith th
e re
sid
ua
l ris
k a
ssocia
ted w
ith
Pro
ject a
ctiv
ities.
Ne
xe
n re
cog
nis
es th
at m
an
ag
em
ent c
ontrib
ute
s s
ign
ifica
ntly
to lo
ng
term
busin
ess s
uccess.
Ne
xe
n U
K’s
HS
E p
olic
y is
pro
vid
ed
in F
igure
1-2
.
Ettric
k a
nd
Bla
ckb
ird D
eco
mm
issio
nin
g E
IA
Do
cu
me
nt N
o. E
TR
K0
00
1-G
E-O
000-L
C-R
PT
-0006
No
ve
mb
er 2
016
P
ag
e 2
4 o
f 109
F
igu
re 1
-2: N
ex
en
’s H
SE
po
licy.
Ettric
k a
nd
Bla
ckb
ird D
eco
mm
issio
nin
g E
IA
Do
cu
me
nt N
o. E
TR
K0
00
1-G
E-O
000-L
C-R
PT
-0006
No
ve
mb
er 2
016
P
ag
e 2
5 o
f 109
P
RO
JE
CT
DE
SC
RIP
TIO
N
2.0
Th
is s
ectio
n d
escrib
es th
e E
&B
facilitie
s to
be d
eco
mm
issio
ne
d a
nd
outlin
es th
e p
rop
osed
d
eco
mm
issio
nin
g
activ
ities.
Plu
g
and
A
ban
do
nm
ent
(P&
A)
of
the
we
lls
is
co
ve
red
b
y
se
pa
rate
reg
ula
tory
req
uire
me
nts
and
there
fore
ou
tsid
e th
e s
co
pe
of th
is E
IA. H
ow
eve
r, for
co
mp
lete
ne
ss a
nd
cla
rity, th
e m
easu
res p
lann
ed
for th
e P
&A
activ
ities a
re o
utlin
ed
in th
is
docu
me
nt. P
rior to
sa
il aw
ay th
e p
rep
ara
tory
wo
rks a
ssocia
ted
with
flushin
g a
nd
cle
an
ing
of
the A
oka
Miz
u to
psid
es a
nd
su
bse
a in
frastru
ctu
re w
ere
ca
ptu
red
in th
e fa
cilitie
s p
rod
uctio
n
perm
its a
nd a
re th
ere
fore
only
refe
rence
d h
ere
for c
om
ple
ten
ess.
2.1
F
ield
Ove
rvie
w
Th
e
Ettric
k
deve
lopm
en
t w
as
orig
inally
co
mm
issio
ne
d
in
200
9,
and
co
mpris
es
se
ve
n
pro
du
ctio
n w
ells
and
two
WI w
ells
. All th
e w
ells
are
clu
ste
red a
rou
nd th
e E
ttrick D
rill Ce
ntre
M
an
ifold
(ED
CM
), with
the e
xce
ptio
n o
f one
of th
e W
I we
lls, w
hic
h is
tied b
ack c
. 4 k
m to
the
ED
CM
(F
igu
re
2-1
). T
he
E
DC
M
wa
s
tied
back
c.1
.5 k
m
to
the
FP
SO
b
y
four
flexib
le
flow
lines; tw
o p
rodu
ctio
n, o
ne W
I and o
ne
gas lift flo
wlin
e, a
nd
on
e u
mb
ilica
l.
Th
e B
lackb
ird d
eve
lopm
ent w
as c
om
mis
sio
ne
d in
201
1 a
nd
lies c
. 6 k
m s
outh
of th
e E
ttrick
deve
lopm
ent. T
he d
eve
lopm
ent c
om
pris
es tw
o p
rodu
ctio
n w
ells
and
one
WI w
ell tie
d b
ack to
th
e B
lackb
ird m
anifo
ld. C
ontro
ls a
t the B
lackb
ird m
anifo
ld w
ere
pro
vid
ed
by a
n u
mb
ilica
l ro
ute
d d
irectly
from
the F
PS
O w
hils
t pro
du
ctio
n w
as ro
ute
d to
the F
PS
O v
ia th
e E
DC
M. A
n
8” W
I pip
elin
e c
onn
ects
the E
DC
M to
the B
lackbird
WI w
hils
t a 3
” ga
s lift p
ipelin
e c
onn
ects
th
e E
DC
M to
the B
lackb
ird m
anifo
ld (F
igure
2-2
).
An
ap
pra
isa
l we
ll at th
e B
lackb
ird fie
ld w
ill als
o b
e a
ba
nd
on
ed
as p
art o
f this
wo
rksco
pe.
Oil w
as e
xp
orte
d fro
m th
e A
oka
Miz
u (F
igu
re 2
-3) v
ia s
hu
ttle ta
nker.
Ga
s w
as e
xp
orte
d v
ia a
6 k
m 6
” flexib
le flo
wlin
e c
onn
ecte
d to
the S
AG
E p
ipelin
e via
a
p
ipelin
e
end
m
anifo
ld
(PL
EM
). T
he
PL
EM
w
ill re
ma
in
in
ope
ratio
n
follo
win
g
E&
B
deco
mm
issio
nin
g a
s it is
utilis
ed fo
r the G
old
en E
ag
le A
rea D
eve
lopm
ent (G
EA
D) tie
-in to
th
e S
AG
E p
ipelin
e.
Full d
eta
ils o
f the in
sta
llatio
ns a
nd
pip
elin
es to
be d
eco
mm
issio
ne
d a
re p
rovid
ed
in th
e d
raft
De
com
mis
sio
nin
g
Pro
gra
mm
es
(Ne
xe
n,
201
6a)
and
su
mm
aris
ed
in
Se
ctio
n
2.2
of
this
d
ocu
me
nt
Blackbird and Ettrick Decommissioning EIA
Document No. ETRK0001-GE-O000-LC-RPT-0006
September 2016 Page 26 of 109
Figure 2-1: Schematic showing the Ettrick Field development layout.
Blackbird and Ettrick Decommissioning EIA
Document No. ETRK0001-GE-O000-LC-RPT-0006
September 2016 Page 27 of 109
Figure 2-2: Schematic showing the Blackbird Field development layout.
Bla
ckb
ird a
nd E
ttrick D
eco
mm
issio
nin
g E
IA
Do
cu
me
nt N
o. E
TR
K0
00
1-G
E-O
000-L
C-R
PT
-0006
Se
pte
mb
er 2
016
P
ag
e 2
8 o
f 109
F
igu
re 2
-3: T
he
Ao
ka
Miz
u F
PS
O.
2.2
E
ttrick a
nd
Bla
ckb
ird S
ub
se
a In
frastru
ctu
re
Th
e s
ubse
a in
frastru
ctu
re a
ssocia
ted
with
the E
&B
field
s is
su
mm
aris
ed
in T
able
2-1
. The
leng
ths p
rovid
ed
inclu
de
the s
hort s
ectio
ns re
cove
red
to d
ate
(as d
escrib
ed
in S
ectio
n
2.3
.3).
On
ly
a
sum
ma
ry
of
the
infra
stru
ctu
re
is
pro
vid
ed
h
ere
w
hils
t th
e
dra
ft D
ecom
mis
sio
nin
g P
rog
ram
me
s c
onta
in m
ore
de
taile
d in
form
atio
n o
n e
ach
item
(Ne
xe
n,
2016a). N
ote
the u
mb
ilica
l jum
pe
rs (Ite
m 8
in T
ab
le 2
-1) a
re o
n th
e s
ea
be
d a
s b
un
dle
s
sim
ilar to
those s
how
n in
Fig
ure
2-4
. With
in th
e b
un
dle
s th
ere
is a
n e
lectric
ca
ble
and
a
num
ber o
f hoses (ra
ng
e fro
m 1
to 1
2) th
at w
ere
used
to tra
nsp
ort th
e re
qu
ired c
hem
ica
ls
inclu
din
g:
wa
x
inhib
itors
, m
eth
an
ol,
asph
alte
ne
in
hib
itors
, co
rrosio
n
inhib
itors
a
nd
hyd
raulic
fluid
s.
Blackbird and Ettrick Decommissioning EIA
Document No. ETRK0001-GE-O000-LC-RPT-0006
September 2016 Page 29 of 109
Table 2-1: Summary of subsea infrastructure associated with the Ettrick and Blackbird Developments.
Item
no. Structure Tag
Total length of lines (km)
Total length Trenched & buried (with occasional
rock cover)
In water column
(risers/dynamic umbilicals)
On the seabed
Pipelines
1 Production flowlines PL2443 PL2444 PL2799
9.034 8.157 0.537 0.340
2 Production spools/jumpers Various 0.520 0.000 0.000 0.520
3 Water injection flowlines PL2446
PL2446JI2 PL2919
12.506 11.815 0.268 0.423
4 Water injection spools/jumpers Various 0.040 0.000 0.000 0.040
5 Gas lift and gas export flowlines PL2445 PL2448 PL2800
13.590 12.759 0.471 0.360
6 Gas lift and export spools/jumpers Various 0.460 0.000 0.000 0.460
7 Umbilicals
PLU2447 PLU2447JI2
PLU2449 PLU2801 PLU2802 PLU2920
16.242 14.993 0.759 0.490
8 Umbilical jumpers Various 0.935 0.000 0.000 0.935
Structure Quantity Description
Subsea installations
9 Xmas trees and associated subsea 12 7.9 m (L) x 7.9 m (W) x 5.3 m (H). Note the control modules are mounted on
Blackbird and Ettrick Decommissioning EIA
Document No. ETRK0001-GE-O000-LC-RPT-0006
September 2016 Page 30 of 109
control modules and wellheads (9 production and 3 WI) and well
the Xmas trees. All Xmas trees have an integrated protection structure.
10 Blackbird appraisal well wellhead 1 Ø 7 m X 5 m (H)
11 Manifold 2
20.5 m (L) x 14.9 m (W) x 5 m (H)
and 11.5 m(L) x 7.8 m (W) 3 m (H)
Both secured with four piles
12 Subsea Safety Isolation Valve (SSIV) 1 Dimensions: 8.9 m (L) x 7 m (W) x 3.68 m (H).
Gravity based structure.
13 Subsea Distribution Unit (SDU) 4 Dimensions: 1.8 m (L) x 1.5 m (W) x 1 m (H)
Gravity based structure.
14 Valve skids 2
Dimensions: 3.4 m (L) x 0.9 m W) x 1.3 m (H) and
2.9 m (L) x 0.9 m (W) x 1.0 m (H)
Gravity based structures.
15 Pigging skid 1 Dimensions: 6.3 m (L) x 4.3 m (W) x 0.9 m (H).
Gravity based structure.
16 Riser base/holdback structures 5 Various dimensions: maximum 12 m (L) x 6.8 m (W) x 1.3 m (H).
Each secured to the seabed via a Ø 4 m suction pile.
17 Disconnectable Turret Buoy (DTB) 1 Ø 11 m X 12.5 m (H)
Currently submerged in the water column.
18 Midwater arch, base frame and clump weights
1 each of arch and
base frame and 2 clump
weights.
One arch: 15 m (L) x 9.3 m (W) x 6.9 m (H), tethered to clump weights via two 54 m tether chains.
One base frame (21.8 m (L) x 4.8 m (W) x 3.5 m (H), secured to the seabed via two Ø 4 m suction cans.
Two clump weights: Ø 2.9 m x 2.5 m (H), gravity based.
19 84” Mooring piles 9 Ø 2.134 m x 48 m (H)
20 Mooring lines (mooring legs) 9 1.46 km each in length
Bla
ckb
ird a
nd E
ttrick D
eco
mm
issio
nin
g E
IA
Do
cu
me
nt N
o. E
TR
K0
00
1-G
E-O
000-L
C-R
PT
-0006
Se
pte
mb
er 2
016
P
ag
e 3
1 o
f 109
Fig
ure
2-4
: Ph
oto
gra
ph
sh
ow
ing
bu
nd
led
um
bilic
al ju
mp
ers
.
2.2
.1
We
lls
Th
e E
ttrick d
eve
lopm
ent c
om
pris
es s
eve
n p
rod
uctio
n w
ells
: P1
to P
7, a
nd tw
o W
I we
lls:
refe
rred to
as I2
an
d I5
.
Th
e B
lackb
ird d
eve
lopm
ent c
om
pris
es tw
o p
rodu
ctio
n w
ells
: PB
1 a
nd
PB
2, a
nd
one
WI
we
ll: IB1
. A s
uspe
nd
ed
ap
pra
isa
l we
ll at th
e B
lackbird
field
will a
lso
be a
bandoned a
s p
art
of th
is w
ork
sco
pe
.
Th
e 1
3 w
ells
to b
e d
ecom
mis
sio
ne
d e
ach h
ave
a w
ellh
ea
d s
tructu
re a
ssocia
ted
with
them
. In
add
ition th
e 1
2 a
ctiv
e w
ells
(exclu
de
s th
e B
lackb
ird a
ppra
isa
l we
ll) ea
ch
ha
ve a
Xm
as
tree a
nd
associa
ted
co
ntro
l mo
du
les th
at w
ill req
uire
to b
e d
ecom
mis
sio
ne
d.
2.2
.2
Ris
er a
nd
Dyn
am
ic U
mb
ilicals
In to
tal fiv
e ris
ers
(two
pro
du
ctio
n, o
ne
WI, o
ne g
as lift a
nd
one g
as e
xp
ort) a
nd th
ree
dyn
am
ic u
mb
ilica
ls (o
ne
to e
ach
of th
e m
anifo
lds a
nd
one
to th
e S
SIV
on
the g
as e
xp
ort
pip
elin
e)
co
nn
ecte
d
the
F
PS
O
to
the
su
bse
a
infra
stru
ctu
re
(Tab
le
2-1
) via
a
D
isco
nn
ecta
ble
Tu
rret B
uoy (D
TB
). Th
e ris
ers
rang
e in
leng
th fro
m 0
.21
km
to 0
.27 k
m
and
the d
yn
am
ic u
mb
ilica
ls ra
ng
e in
leng
th fro
m 0
.21
km
to 0
.34
km
. Follo
win
g F
PS
O s
ail
aw
ay th
e ris
ers
and d
yn
am
ic u
mb
ilica
ls a
re s
till co
nn
ecte
d to
the D
TB
wh
ich
is c
urre
ntly
su
bm
erg
ed in
the w
ate
r co
lum
n (s
ee S
ectio
n 2
.3.2
.).
2.2
.3
Pro
du
ctio
n F
low
lines
Th
e F
PS
O w
as c
onn
ecte
d to
the E
DC
M v
ia tw
o 1
.65 k
m tre
nch
ed
pro
ductio
n flo
wlin
es
(PL
24
43
and
PL
24
44
). Th
is m
anifo
ld is
als
o c
onn
ecte
d to
the B
lackb
ird m
anifo
ld v
ia a
5.8
km
tre
nch
ed
pro
ductio
n
flow
line
(P
L28
00
). T
he
ma
nifo
lds
are
con
ne
cte
d
to
the
pro
du
ctio
n w
ells
via
a s
erie
s o
f sp
oo
ls la
id o
n th
e s
eab
ed
with
a to
tal c
om
bin
ed
leng
th o
f 0.4
6 k
m (F
igu
re 2
-1, F
igure
2-2
).
Bla
ckb
ird a
nd E
ttrick D
eco
mm
issio
nin
g E
IA
Do
cu
me
nt N
o. E
TR
K0
00
1-G
E-O
000-L
C-R
PT
-0006
Se
pte
mb
er 2
016
P
ag
e 3
2 o
f 109
2.2
.4
Wa
ter In
jectio
n F
low
line
s
Th
e F
PS
O w
as c
onn
ecte
d to
the E
DC
M v
ia a
1.6
5 k
m tre
nch
ed
WI flo
wlin
e (P
L24
46
). F
rom
this
ma
nifo
ld a
tren
che
d 4
.16 k
m W
I flow
line
(PL
24
46
JI2
) co
nn
ects
to o
ne
of th
e
Ettric
k W
I we
lls (I2
) and a
6.7
km
trench
ed
WI flo
wlin
e (P
L24
48
) co
nn
ects
to th
e B
lackb
ird
WI
we
ll. S
urfa
ce la
id sp
oo
ls w
ith a
to
tal
leng
th o
f 0
.04 k
m co
nn
ect
the E
DC
M to
th
e
se
con
d E
ttrick W
I we
ll (I5) (P
L24
46JI5
).
2.2
.5
Ga
s L
ift Flo
wlin
es
Th
e F
PS
O w
as c
onn
ecte
d to
the E
DC
M v
ia a
1.6
3 k
m tre
nch
ed g
as lift flo
wlin
e. T
his
m
anifo
ld is
als
o c
onn
ecte
d to
the B
lackb
ird m
anifo
ld v
ia a
5.8
km
trench
ed
ga
s lift flo
wlin
e
(PL
28
00
). Th
e m
anifo
lds a
re c
onn
ecte
d to
the p
rod
uctio
n w
ells
via
a s
erie
s o
f ga
s lift
sp
oo
ls la
id o
n th
e s
eab
ed
with
a to
tal c
om
bin
ed
leng
th o
f 0.4
6 k
m.
2.2
.6
Ga
s E
xp
ort F
low
lines
Th
e F
PS
O w
as co
nn
ecte
d to
th
e S
AG
E p
ipelin
e via
a
6
.17
km
tre
nch
ed
g
as e
xp
ort
flow
line. T
he g
as e
xp
ort p
ipelin
e a
lso
co
mp
rise
s a
c. 0
.25 k
m s
poo
l, an S
SIV
and
a P
LE
M.
Th
e P
LE
M w
ill rem
ain
in o
pe
ratio
n fo
llow
ing
E&
B d
eco
mm
issio
nin
g, a
s it w
ill be
utilis
ed
for
the G
EA
D tie
-in to
the S
AG
E p
ipelin
e.
2.2
.7
Um
bilic
al L
ines
Th
e F
PS
O w
as c
onn
ecte
d to
the E
DC
M v
ia a
1.6
4 k
m tre
nch
ed
um
bilic
al (P
LU
244
7) a
nd
is c
onn
ecte
d to
the B
lackb
ird m
anifo
ld v
ia a
7.7
4 k
m tre
nch
ed
um
bilic
al (P
LU
280
2). A
t the
Ettric
k fie
ld a
4.1
4 k
m tre
nch
ed
um
bilic
al c
onn
ects
to th
e I2
WI w
ell (P
LU
244
7JI2
) and
a
0.0
3 k
m s
urfa
ce la
id u
mb
ilica
l jum
pe
r co
nn
ects
the E
DC
M to
the I5
WI w
ell.
A 2
.04
km
trench
ed
um
bilic
al c
onn
ects
the B
lackb
ird m
anifo
ld to
the B
lackb
ird W
I we
ll (P
LU
292
0).
A 0
.46
km
trench
ed u
mb
ilica
l co
nn
ecte
d th
e F
PS
O to
the g
as e
xp
ort S
SIV
.
Th
irteen s
urfa
ce la
id u
mb
ilica
l jum
pe
r bun
dle
s, c
onta
inin
g e
lectric
al c
able
s a
nd
ch
em
ica
l flo
wlin
es a
s d
escrib
ed
con
ne
ct th
e m
anifo
lds to
the
we
lls a
nd
have
a to
tal c
om
bin
ed
leng
th
of c
. 0.9
4 k
m.
2.2
.8
Oth
er S
truc
ture
s
Ta
ble
2-1
iden
tifies th
e o
the
r stru
ctu
res a
ssocia
ted w
ith th
e E
&B
field
s. T
hese
com
pris
e
two m
anifo
lds, a
n S
SIV
, four S
DU
s, tw
o v
alv
e s
kid
s, a
pig
gin
g s
kid
, and a
PL
EM
on th
e
ga
s e
xp
ort lin
e. T
houg
h a
s d
iscu
ssed
the P
LE
M w
ill not b
e d
eco
mm
issio
ne
d a
nd
there
fore
is
not lis
ted in
Ta
ble
2-1
.
In
add
ition,
a
num
ber
of
su
pp
ort
stru
ctu
res
asso
cia
ted
w
ith
the
rise
rs
and
d
yn
am
ic
um
bilic
als
are
locate
d w
ithin
the D
TB
500 m
exclu
sio
n z
one
, inclu
din
g a
mid
wa
ter a
rch
held
on lo
catio
n v
ia tw
o c
lum
p w
eig
hts
and
teth
er c
hain
s, th
ree ris
er b
ase
stru
ctu
res a
nd
two ris
er h
old
back s
tructu
res.
As id
en
tified in
Ta
ble
2-1
so
me
of th
ese s
tructu
res a
re s
ecure
d o
n lo
catio
n u
sin
g p
iles
wh
ilst o
the
rs a
re g
ravity
base
d.
Bla
ckb
ird a
nd E
ttrick D
eco
mm
issio
nin
g E
IA
Do
cu
me
nt N
o. E
TR
K0
00
1-G
E-O
000-L
C-R
PT
-0006
Se
pte
mb
er 2
016
P
ag
e 3
3 o
f 109
2.2
.9
FP
SO
Mo
orin
gs
Prio
r to s
ail a
wa
y th
e F
PS
O w
as h
eld
on s
tatio
n v
ia n
ine m
oorin
g c
hain
s e
ach
with
a
leng
th o
f 1.4
6 k
m. E
ach m
oorin
g lin
e is
atta
che
d to
an
anch
or p
ile. T
he m
oo
ring
lines w
ere
a
ttache
d to
the F
PS
O a
t the D
TB
and c
urre
ntly
rem
ain
co
nn
ecte
d to
the D
TB
at o
ne
end
and
the a
nch
or p
iles a
t the o
ther (s
ee S
ectio
n 2
.3.2
.).
2.2
.10 P
rote
ctiv
e S
truc
ture
s
Ro
ckco
ve
r, mattre
sses a
nd p
oly
pro
pyle
ne
gro
ut b
ag
s h
ave
bee
n u
sed
for p
rote
ctio
n a
t the
E&
B d
eve
lopm
ents
. T
able
2-2
su
mm
aris
es th
e q
uan
tities o
f each
asso
cia
ted
with
the E
ttrick a
nd
ga
s e
xp
ort
infra
stru
ctu
re
and
the
Bla
ckb
ird
infra
stru
ctu
re.
T
he
De
com
mis
sio
nin
g
Pro
gra
mm
es
iden
tify th
ose
trench
ed
an
d b
urie
d p
ipelin
es a
nd
um
bilic
als
that h
ave
are
as o
f rock c
ove
r a
long
them
. Th
e m
attre
sse
s a
nd
poly
pro
pyle
ne
gro
ut b
ag
s a
re p
rimarily
associa
ted
with
p
rote
ctio
n a
t the tre
nch tra
nsitio
ns a
nd
pro
tectio
n a
nd
su
pp
ort o
f the s
poo
ls.
Ta
ble
2-2
: Pro
tec
tive
stru
ctu
res
us
ed
at th
e E
ttrick
an
d B
lac
kb
ird D
eve
lop
men
ts.
Stru
ctu
re
Ettric
k a
nd
ga
s
ex
po
rt line
Bla
ck
bird
T
ota
l
Ro
ckco
ve
r (Te
) 3
2,6
27
42,7
50
7
5,3
77
Ma
ttresse
s
(nu
mbe
r of 4
.6 T
e m
attre
sse
s)
209
192
401
Gro
ut b
ags (n
um
be
r of 2
5 k
g b
ag
s)
2,4
00
2,6
00
5,0
00
2.3
A
ctiv
ities to
Date
2.3
.1
Flu
sh
ing
an
d P
urg
ing
of th
e T
op
sid
es
an
d S
ub
se
a In
fras
truc
ture
Follo
win
g s
uspe
nsio
n o
f pro
du
ctio
n in
Ju
ne 2
01
6 p
rep
ara
tory
wo
rks, in
clu
din
g flu
shin
g a
nd
pig
gin
g o
f the to
psid
es a
nd
flow
lines, w
ere
ca
rried o
ut in
ord
er to
cle
an
the in
frastru
ctu
re
of
as m
uch re
sid
ua
l o
il a
nd
ch
em
ica
ls a
s p
ossib
le p
rior
to th
e d
isco
nne
ctio
n o
f th
e
flow
lines
from
th
e
we
lls
and
th
e
Aoka
M
izu
F
PS
O.
Th
e
pig
gin
g
and
flu
shin
g
fluid
s,
inclu
din
g th
ose a
pp
lied s
ubse
a fro
m a
Div
e S
upp
ort V
esse
l (DS
V) w
ere
route
d in
to th
e
slo
ps ta
nks th
en
thro
ug
h th
e p
rodu
ced
wa
ter tre
atm
ent s
yste
m p
rior to
dis
ch
arg
e. T
he
dis
ch
arg
es w
ere
ma
na
ge
d a
nd
mo
nito
red
follo
win
g th
e s
am
e p
rocess a
nd
pro
ce
dure
s a
s
the n
orm
al p
rod
uced
wa
ter b
atc
h d
isch
arg
e. T
he
se a
ctiv
ities w
ere
perm
itted u
nd
er th
e
exis
ting
p
rod
uctio
n
perm
its
(PR
A/1
09
).
Th
e
E&
B
flow
lines
cu
rrently
co
nta
in
treate
d
se
aw
ate
r and
min
ima
l qu
an
tities o
f resid
ua
l hyd
roca
rbo
ns w
hic
h re
ma
ined
in th
e flo
wlin
es
post p
igg
ing
and
flushin
g. T
he tre
ate
d s
eaw
ate
r pro
vid
es s
om
e d
eg
ree o
f pro
tectio
n to
e
nsu
re
the
pip
elin
es
are
of
su
itable
in
teg
rity
for
recove
ry
as
part
of
full
field
d
eco
mm
issio
nin
g.
In
ad
ditio
n,
the
flow
lines
are
cu
rrently
ca
pp
ed
to
p
reve
nt
wild
life
ing
ress.
Bla
ckb
ird a
nd E
ttrick D
eco
mm
issio
nin
g E
IA
Do
cu
me
nt N
o. E
TR
K0
00
1-G
E-O
000-L
C-R
PT
-0006
Se
pte
mb
er 2
016
P
ag
e 3
4 o
f 109
2.3
.2
Dis
co
nn
ec
tion
of th
e D
isco
nn
ec
tab
le T
urre
t Bu
oy
Th
e ris
ers
, dyn
am
ic u
mbilic
als
and
mo
orin
g s
yste
m w
ere
co
nn
ecte
d to
the
Ao
ka
Miz
u v
ia
a D
TB
syste
m. F
ollo
win
g flu
shin
g a
nd
purg
ing
of th
e to
psid
es th
e F
PS
O w
as s
epa
rate
d
from
the D
TB
wh
ich
rem
ain
s s
ubm
erg
ed in
the w
ate
r co
lum
n fo
llow
ing
FP
SO
sa
il aw
ay.
Th
e ris
ers
and
mo
orin
g s
yste
m c
urre
ntly
rem
ain
in s
itu h
un
g o
ff the D
TB
wh
ich
is re
stin
g
at a
neu
trally
buo
ya
nt d
ep
th o
f appro
xim
ate
ly 4
5 m
.
2.3
.3
Re
co
ve
ry o
f Se
ctio
n o
f Ga
s E
xp
ort P
ipelin
e a
nd
Sec
tion
s o
f Rig
id S
po
ols
With
a
pp
rova
l fro
m B
EIS
, N
exe
n h
as re
cove
red
a
se
ctio
n of
the g
as e
xp
ort
pip
elin
e
(c. 1
5 m
) follo
win
g d
isco
nn
ectio
n fro
m th
e G
as E
xp
ort P
LE
M. In
add
ition s
hort s
ectio
ns (2
-3
m) o
f each
of th
e rig
id p
rod
uctio
n, g
as lift a
nd
wa
ter in
jectio
n s
poo
ls c
onn
ectin
g to
the
w
ells
we
re re
mo
ve
d a
t each
Xm
as tre
e in
ord
er to
allo
w a
1 m
cle
ara
nce a
rou
nd e
ach
Xm
as tre
e to
allo
w rig
acce
ss fo
r su
bseq
uent P
lug
an
d A
ban
do
nm
ent (P
&A
) activ
ities.
Th
e e
nviro
nm
enta
l imp
act a
ssocia
ted w
ith th
e re
cove
red
item
s to
date
have
pre
vio
usly
bee
n a
ssesse
d (P
LA
/317
). Ho
we
ve
r in o
rde
r to a
ssess th
e c
um
ula
tive
imp
act, th
is E
IA
assesse
s th
e im
pact o
f the d
eco
mm
issio
nin
g o
f all th
e s
ubse
a in
frastru
ctu
re in
clu
din
g th
e
pip
elin
e a
nd
sp
oo
l se
ctio
ns th
at h
ave
alre
ad
y b
een
recove
red
.
2.4
S
ch
ed
ule
of A
ctiv
ities
Ne
xe
n p
rop
ose to
P&
A a
nd d
eco
mm
issio
n th
e E
&B
field
s in
four p
ha
ses/s
co
pe
s:
· P
hase
1: S
ubse
a s
co
pe
1 w
hic
h in
clu
de
s re
cove
ry o
f the D
TB
, rise
rs, d
yn
am
ic
um
bilic
als
, MW
A a
nd m
oo
ring
s;
· P
hase
2: W
ell P
&A
;
· P
hase
3: S
ubse
a s
co
pe
2 w
hic
h in
clu
de
s re
cove
ry o
f ma
nifo
lds, S
SIV
, SD
Us,
jum
pers
, tra
nsitio
n e
nd
s a
nd
e
xp
ose
d se
ctio
ns of
pip
elin
es a
nd
u
mb
ilica
ls.
Gro
ut b
ag
s a
nd m
attre
sse
s w
ill als
o b
e re
co
ve
red
durin
g th
is p
ha
se; a
nd
· P
hase
4: P
ost d
ecom
mis
sio
nin
g s
urv
ey.
Th
ese p
ha
ses w
ill be c
arrie
d o
ut b
ase
d o
n th
e in
dic
ativ
e s
ch
ed
ule
sh
ow
n in
Fig
ure
2-5
.
Fig
ure
2-5
: Ind
ica
tive
sch
ed
ule
of p
rop
os
ed
ac
tivitie
s.
Bla
ckb
ird a
nd E
ttrick D
eco
mm
issio
nin
g E
IA
Do
cu
me
nt N
o. E
TR
K0
00
1-G
E-O
000-L
C-R
PT
-0006
Se
pte
mb
er 2
016
P
ag
e 3
5 o
f 109
2.5
F
ate
of th
e E
ttrick
an
d B
lac
kb
ird In
fras
truc
ture
OS
PA
R d
ecis
ion 9
8/3
as in
terp
rete
d in
DE
CC
’s g
uid
an
ce n
ote
s d
oes n
ot le
ave
Ne
xe
n
gro
un
ds to
se
ek d
ero
gatio
n fo
r the s
ubse
a in
sta
llatio
ns s
uch th
at th
e w
ellh
ea
ds, X
mas
trees a
nd a
ssocia
ted c
on
trol m
odu
les, th
e m
anifo
lds, S
SIV
, SD
Ms, s
kid
s, m
id w
ate
r arc
h,
rise
r base a
nd
hold
back s
tructu
res e
tc. m
ust b
e re
cove
red
. In a
dd
ition th
e D
TB
, rise
rs,
dyn
am
ic
um
bilic
als
a
nd
su
rface
laid
ju
mp
ers
a
nd
sp
oo
ls
will
als
o
be
recove
red
. M
attre
sses a
nd g
rout b
ag
s w
ill be re
cove
red
wh
ere
techn
ica
lly fe
asib
le to
do s
o.
Th
e d
rill cu
tting
s p
iles a
re c
onsid
ere
d to
be s
ma
ll in fo
otp
rint a
nd
he
ight a
nd
are
wid
ely
d
isp
ers
ed s
uch th
at th
ey fa
ll belo
w th
e O
SP
AR
20
06
/5 th
resh
old
s. A
s a
result th
ey w
ill be
le
ft und
istu
rbe
d a
nd
there
fore
deco
mm
issio
ne
d in
situ
.
In lin
e w
ith B
EIS
gu
idan
ce n
ote
s (D
EC
C, 2
011
) Ne
xe
n p
rop
ose to
se
ve
r all p
iles b
elo
w th
e
natu
ral s
eab
ed
leve
l to s
uch a
dep
th a
s to
ensu
re th
at a
ny re
ma
ins a
re u
nlik
ely
to b
eco
me
unco
ve
red
. Th
e s
eve
red to
p s
ectio
ns w
ill be re
cove
red
to s
hore
for re
cyclin
g.
DE
CC
’s g
uid
an
ce n
ote
s re
cog
nis
e th
at re
mo
vin
g p
ipelin
es b
urie
d to
a s
uffic
ient d
ep
th m
ay
not
be
the
pre
ferre
d
deco
mm
issio
nin
g
optio
n.
Th
ey
pro
vid
e
for
a
ca
se
by
ca
se
co
nsid
era
tion
of
pip
elin
e d
ecom
mis
sio
nin
g a
ltern
ativ
es o
n th
e b
asis
o
f a
C
A.
Ne
xe
n’s
C
om
pa
rativ
e A
sse
ssm
en
t Re
po
rt (Ne
xe
n, 2
01
4) s
ubm
itted w
ith th
is E
IA in
su
pp
ort o
f the
dra
ft D
ecom
mis
sio
nin
g P
rogra
mm
es pro
vid
es fu
ll d
eta
ils o
f th
e C
A ca
rried o
ut
for
the
deco
mm
issio
nin
g o
f the p
ipelin
es a
nd
um
bilic
als
. A s
um
ma
ry o
f the o
utc
om
e o
f the C
A is
p
rovid
ed
he
re.
2.5
.1
Co
mp
ara
tive
As
se
ss
me
nt
As p
art o
f the C
A a
num
ber o
f decom
mis
sio
nin
g o
ptio
ns w
ere
co
nsid
ere
d fo
r each
of th
e
trench
ed a
nd
burie
d p
ipelin
es a
nd
um
bilic
als
:
1)
Lea
ve
in p
lace a
nd
rock cove
r transitio
n e
nd
s a
nd
exp
ose
d se
ctio
ns a
long
th
e
pip
elin
e;
2)
Ro
ck c
ove
r transitio
n e
nd
s a
nd
cut a
nd
rem
ove
exp
ose
d p
ipelin
e s
ectio
ns;
3a) B
ury
transitio
n e
nd
s a
nd
rock c
ove
r exp
ose
d s
ectio
ns;
3b)
Cu
t a
nd
re
mo
ve
a
ll e
xp
ose
d
se
ctio
ns
in
trench
a
nd
a
llow
tre
nch
to
b
ackfill
natu
rally
; and
4)
Co
mp
lete
recove
ry o
f all b
urie
d flo
wlin
es a
nd
um
bilic
als
.
No
te: tra
nsitio
n e
nd
refe
rs to
tha
t end
se
ctio
n o
f the
pip
elin
e e
xitin
g th
e tre
nch
.
Ea
ch o
ptio
n w
as s
co
red a
ga
inst s
afe
ty, e
nviro
nm
enta
l imp
act, te
chn
ica
l fea
sib
ility, s
ocie
tal
imp
act,
repu
tatio
n,
ong
oin
g
liability
a
nd
e
con
om
ics
and
q
uantifie
d
at
five
le
ve
ls
of
co
nse
qu
ence
: min
or, s
erio
us, m
ajo
r, critic
al a
nd
ca
tastro
ph
ic. A
co
nfid
ence
rankin
g fo
r e
ach
ra
ting
w
as a
lso
assig
ned
b
efo
re a
w
eig
hte
d a
ssessm
ent
wa
s ca
rried o
ut
of
the
results
.
Th
e C
A fa
vo
ure
d O
ptio
ns 2
and 3
a fo
r the d
iffere
nt flo
wlin
es a
nd
um
bilic
als
. Ta
ble
2-3
id
en
tifies th
e o
ptim
al a
pp
roa
ch
for e
ach
flow
line/u
mb
ilica
l and
a s
um
ma
ry ju
stific
atio
n fo
r th
e c
hose
n o
ptio
n.
Bla
ckb
ird a
nd E
ttrick D
eco
mm
issio
nin
g E
IA
Do
cu
me
nt N
o. E
TR
K0
00
1-G
E-O
000-L
C-R
PT
-0006
Se
pte
mb
er 2
016
P
ag
e 3
6 o
f 109
Ta
ble
2-3
: Ou
tco
me
from
the C
om
pa
rativ
e A
ss
es
sm
en
t.
Lin
e N
o/ C
A
ou
tco
me
Ju
stific
atio
n
PL
24
43
O
ptio
n 2
/3a
Lin
e is
tren
ch
ed a
nd b
urie
d, w
ith a
n a
dd
itiona
l 9,9
21
te o
f rock c
ove
r and
is s
tab
le w
ith n
o
sn
agg
ing
ha
za
rds. A
t the
ED
CM
en
d o
f flow
line, ro
ck h
as b
ee
n p
lace
d u
p to
the
en
d o
f the
tran
sitio
n p
oin
t, elim
ina
ting
Optio
n 3
a. In
this
ca
se
, rock w
ill be
pla
ce
d a
s p
er O
ptio
n 2
.
PL
24
44
Op
tion
2
Lin
e is
tren
ch
ed a
nd b
urie
d, w
ith a
n a
dd
itiona
l 8,2
61
te o
f rock c
ove
r and
is s
tab
le w
ith n
o
sn
agg
ing
ha
za
rds. A
t bo
th e
nd
s o
f the
flow
line
, rock h
as b
ee
n p
laced
up
to th
e e
nd
of th
e
tran
sitio
n p
oin
t, elim
ina
ting
Optio
n 3
a. R
ock w
ill be
pla
ce
d a
s p
er O
ptio
n 2
.
PL
24
45
Op
tion
2
Lin
e is
tren
ch
ed a
nd b
urie
d, w
ith a
n a
dd
itiona
l 3,6
89
te o
f rock c
ove
r and
is s
tab
le w
ith n
o
sn
agg
ing
ha
za
rds. A
t bo
th e
nd
s o
f the
flow
line
, rock h
as b
ee
n p
laced
up
to th
e e
nd
of th
e
tran
sitio
n p
oin
t, elim
ina
ting
Optio
n 3
a. R
ock w
ill be
pla
ce
d a
s p
er O
ptio
n 2
.
PL
24
46
Op
tion
2
Lin
e is
trench
ed
an
d b
urie
d, w
ith a
n a
dd
ition
al 2
21
te o
f rock c
ove
r an
d is
sta
ble
with
no
sn
agg
ing
ha
za
rds. A
t bo
th e
nd
s o
f the
flow
line
, rock h
as b
ee
n p
laced
up
to th
e e
nd
of th
e
tran
sitio
n p
oin
t, elim
ina
ting
Optio
n 3
a. R
ock w
ill be
pla
ce
d a
s p
er O
ptio
n 2
.
PL
24
46J
I2
Op
tion
3a
Lin
e is
trench
ed
an
d b
urie
d, w
ith a
n a
dd
ition
al 6
56
te o
f rock c
ove
r an
d is
sta
ble
with
no
sn
agg
ing
ha
za
rds. T
he
tran
sitio
n s
ectio
ns a
t eith
er e
nd
of th
e flo
wlin
e w
ill be
dre
dg
ed
an
d
bu
ried to
a d
ep
th o
f no le
ss th
an
0.6
m.
PL
U2
44
7
Op
tion
3a
Um
bilic
al is
trench
ed
an
d b
urie
d, w
ith a
n a
dditio
na
l 52
te o
f rock c
ove
r an
d is
sta
ble
with
no
sn
agg
ing
ha
za
rds. T
he
tran
sitio
n s
ectio
ns a
t eith
er e
nd
of th
e flo
wlin
e w
ill be
dre
dg
ed
an
d
bu
ried to
a d
ep
th o
f no le
ss th
an
0.6
m.
PL
U2
44
7JI2
O
ptio
n 3
a
Um
bilic
al
is tre
nch
ed
a
nd
b
urie
d an
d is
sta
ble
w
ith n
o sn
ag
gin
g ha
za
rds.
Th
e tra
nsitio
n
se
ctio
ns a
t eith
er e
nd
of th
e flo
wlin
e w
ill be
dre
dg
ed a
nd
bu
ried
to a
de
pth
of n
o le
ss th
an
0.6
m.
PL
24
48
Op
tion
2/3
a
Lin
e is
tren
ch
ed
an
d b
urie
d, w
ith a
n a
dditio
na
l 9,8
27
te o
f rock c
ove
r on
the
SS
IV-P
LE
M
flow
line
. Th
e lin
e is
sta
ble
with
no
sn
agg
ing
ha
za
rds. A
t the P
LE
M e
nd
of th
e m
ain
flow
line
, ro
ck ha
s b
ee
n p
lace
d o
ve
r th
e su
rface
la
id flo
wlin
e,
elim
ina
ting
O
ptio
n 3a
. R
ock w
ill b
e
pla
ce
d a
s p
er O
ptio
n 2
in th
is lo
ca
tion
. Th
e th
ree
oth
er tra
nsitio
n s
ectio
ns w
ill be
dre
dg
ed
an
d
bu
ried to
a d
ep
th o
f no le
ss th
an
0.6
m.
PL
U2
44
9
Op
tion
3a
Um
bilic
al
is tre
nch
ed
a
nd
b
urie
d an
d is
sta
ble
w
ith n
o sn
ag
gin
g ha
za
rds.
Th
e tra
nsitio
n
se
ctio
ns a
t eith
er e
nd
of th
e flo
wlin
e w
ill be
dre
dg
ed a
nd
bu
ried
to a
de
pth
of n
o le
ss th
an
0.6
m.
PL
27
99
Op
tion
2
Um
bilic
al is
tren
ch
ed
an
d b
urie
d, w
ith a
n a
dditio
nal 1
6,4
04 te
of ro
ck c
ove
r an
d is
sta
ble
with
n
o s
na
ggin
g h
aza
rds. A
t bo
th e
nd
s o
f the
flow
line, ro
ck h
as b
ee
n p
lace
d u
p to
the
end
of th
e
tran
sitio
n p
oin
t, elim
ina
ting
Optio
n 3
a. R
ock w
ill be
pla
ce
d a
s p
er O
ptio
n 2
.
PL
28
00
Op
tion
2
Lin
e is
tren
che
d a
nd
bu
ried
, with
an
ad
ditio
na
l 10,8
85
te o
f rock c
ove
r and
is s
table
with
no
sn
agg
ing
ha
za
rds. A
t bo
th e
nd
s o
f the
flow
line
, rock h
as b
ee
n p
laced
up
to th
e e
nd
of th
e
tran
sitio
n p
oin
t, elim
ina
ting
Optio
n 3
a. R
ock w
ill be
pla
ce
d a
s p
er O
ptio
n 2
.
PL
U2
80
2
Op
tion
2/3
a
Um
bilic
al is
tren
che
d a
nd
bu
ried
, with
sm
all a
rea
of ro
ck c
ove
ring
~70
m (5
85
te) a
nd
is s
tab
le
with
no
sn
ag
gin
g h
aza
rds. A
t the
Bla
ckb
ird m
anifo
ld e
nd
of th
e u
mbilic
al, ro
ck h
as b
ee
n
pla
ce
d o
ve
r the
su
rface
laid
se
ctio
n, e
limin
atin
g O
ptio
n 3
a. R
ock w
ill be
pla
ce
d a
s p
er O
ptio
n
2 in
this
loca
tion
. Th
e tra
nsitio
n s
ectio
n a
t the F
PS
O w
ill be d
red
ged
an
d b
urie
d to
a d
ep
th o
f n
o le
ss th
an
0.6
m.
PL
29
19
Op
tion
2
Lin
e is
trench
ed a
nd b
urie
d, w
ith a
n a
dditio
na
l 13
,67
0 te
of ro
ck c
ove
r and
is s
tab
le w
ith n
o
sn
agg
ing
ha
za
rds. A
t bo
th e
nds o
f the
flow
line
, rock h
as b
een
pla
ce
d u
p to
the
end
of th
e
tran
sitio
n p
oin
t, elim
ina
ting
Optio
n 3
a. R
ock w
ill be
pla
ce
d a
s p
er O
ptio
n 2
.
PL
U2
92
0
Op
tion
2
Um
bilic
al is
tren
ch
ed a
nd
bu
ried
, with
two
sm
all a
rea
s o
f rock to
tallin
g 1
,20
6 te
an
d t is
sta
ble
w
ith n
o s
na
gg
ing
ha
za
rds. A
t bo
th e
nd
s o
f the
flow
line
, rock h
as b
ee
n p
lace
d u
p to
the
end o
f th
e tra
nsitio
n p
oin
t, elim
ina
ting O
ptio
n 3
a. R
ock w
ill be
pla
ced
as p
er O
ptio
n 2
.
Bla
ckb
ird a
nd E
ttrick D
eco
mm
issio
nin
g E
IA
Do
cu
me
nt N
o. E
TR
K0
00
1-G
E-O
000-L
C-R
PT
-0006
Se
pte
mb
er 2
016
P
ag
e 3
7 o
f 109
2.6
D
eco
mm
issio
nin
g A
ctiv
ities
2.6
.1
We
ll Ab
an
do
nm
en
t / Sh
ut-in
Th
e 1
3 w
ells
(nin
e p
rod
uctio
n w
ells
, thre
e W
I we
lls, a
nd
one
app
rais
al w
ell) w
ill be P
&A
in
accord
an
ce w
ith O
il & G
as g
uid
elin
es fo
r the a
ba
nd
on
me
nt o
f we
lls (D
EC
C Is
su
e 5
, Ju
ly
201
5) a
nd
Ne
xe
n s
tanda
rds. N
exe
n w
ill mo
bilis
e a
sem
i-su
bm
ers
ible
drillin
g rig
to c
arry
o
ut th
e P
&A
activ
ities.
Th
e P
&A
activ
ities a
re e
xp
ecte
d to
inclu
de
:
· In
sta
llatio
n o
f ce
me
nt p
lug
s in
the w
ells
to p
rovid
e th
e re
qu
ired is
ola
tion
for a
ll p
oro
us, p
erm
eab
le a
nd h
yd
roca
rbo
n b
ea
ring
inte
rva
ls;
· C
uttin
g a
nd re
mo
va
l of c
asin
g; a
nd
· R
em
ova
l of th
e w
ellh
ea
ds a
nd
Xm
as tre
es.
Follo
win
g ce
me
ntin
g,
the
su
rface a
nd
co
nd
ucto
r ca
sin
g w
ill b
e cu
t a
pp
roxim
ate
ly 3
m
b
elo
w th
e s
eab
ed
and
the
Xm
as tre
e w
ill be
recove
red
tog
eth
er w
ith th
e c
ut s
ectio
n o
f the
ca
sin
g.
En
viro
nm
enta
l perm
it app
lica
tion
s fo
r the P
&A
of th
e w
ells
will b
e s
ubm
itted u
nd
er a
We
ll In
terv
entio
n
MA
T
(Ma
ste
r A
pplic
atio
n
Te
mp
late
) via
th
e
PE
TS
(P
orta
l E
nviro
nm
enta
l T
rackin
g
Syste
m).
En
viro
nm
enta
l p
erm
it a
pp
lica
tion
s
to
be
su
bm
itted
will
inclu
de
a
C
onse
nt to
Loca
te (C
tL) a
pp
lica
tion
to lo
cate
the d
rilling
rig, a
ch
em
ica
l perm
it app
lica
tion
d
eta
iling
the c
hem
ica
ls to
be
used
and
dis
ch
arg
ed
an
d a
Ma
rine
Lic
ence
for th
e re
mo
va
l of
the w
ellh
ea
ds a
nd
Xm
as tre
es
2.6
.2
Su
bs
ea
De
co
ns
tructio
n
Th
e s
ubse
a in
frastru
ctu
re w
ill be d
eco
mm
issio
ne
d in
a s
afe
co
nd
ition. F
urth
er d
eta
ils o
f th
e a
ctiv
ities d
iscu
ssed
in th
e fo
llow
ing
se
ctio
ns w
ill be p
rovid
ed
in th
e M
arin
e L
ice
nce
p
erm
it a
pp
lica
tion
s
to
be
su
bm
itted
to
BE
IS p
rior
to
co
mm
encem
ent
of
the
offs
hore
d
eco
mm
issio
nin
g c
am
paig
n.
F
low
lines, u
mb
ilicals
an
d ju
mp
ers
2
.6.2
.1
Tre
nch
ed
an
d b
urie
d flo
wlin
es a
nd
um
bilic
als
As
dis
cu
ssed
in
S
ectio
n
2.5
.1
the
burie
d
flow
lines
and
u
mb
ilica
ls
will
larg
ely
b
e
deco
mm
issio
ne
d in
situ
. Th
e n
on
-trench
ed
flow
line
and
um
bilic
al e
nd
s w
ill be s
eve
red
and
re
cove
red
to s
hore
for re
cyclin
g. T
he re
ma
inin
g e
xp
ose
d e
nd
s a
nd
any e
xp
ose
d s
ectio
ns
alo
ng
th
e flo
wlin
es o
r u
mb
ilica
ls w
ill e
ither
be b
urie
d o
r ro
ck co
ve
red
. S
ectio
n 2.6
.3
ca
ptu
res th
e ro
ck c
ove
r req
uire
me
nts
iden
tified a
t the
time
of w
riting
(Note
: Ne
xe
n p
rop
ose
to c
arry
out a
pip
elin
e ro
ute
su
rve
y in
201
7 to
dete
rmin
e if a
ny fu
rther a
rea
s o
f co
nce
rn
reg
ard
ing
depth
of b
uria
l of th
e flo
wlin
es o
r um
bilic
als
have
aris
en).
Su
rface
laid
sp
oo
ls a
nd
jum
pers
All s
urfa
ce la
id s
po
ols
and
jum
pers
will b
e re
cove
red
and
retu
rn to
sh
ore
for re
cyclin
g.
S
ub
sea
Stru
ctu
res
2.6
.2.2
Th
e w
ellh
ea
ds,
Xm
as tre
es a
nd
a
ssocia
ted
con
trol
mo
du
les,
ma
nifo
lds,
SS
IV,
SD
Us,
va
lve
and
pig
gin
g s
kid
s, th
e D
TB
, mid
wa
ter a
rch
and
associa
ted b
ase
fram
e a
nd
clu
mp
Bla
ckb
ird a
nd E
ttrick D
eco
mm
issio
nin
g E
IA
Do
cu
me
nt N
o. E
TR
K0
00
1-G
E-O
000-L
C-R
PT
-0006
Se
pte
mb
er 2
016
P
ag
e 3
8 o
f 109
we
igh
ts w
ill all b
e re
cove
red a
nd
retu
rned
to s
hore
for re
cyclin
g. T
he D
TB
will b
e re
turn
ed
to its
ow
ner, B
luew
ate
r, for fu
ture
rede
plo
ym
ent o
r recyclin
g.
Th
e p
iles a
ssocia
ted
with
the m
anifo
lds a
nd
moo
ring
lines w
ill be s
eve
red w
ith th
e to
p
se
ctio
ns b
ein
g re
mo
ve
d to
a d
ep
th o
f 3 m
belo
w th
e s
eab
ed
. Th
e s
uctio
n c
ans a
ssocia
ted
w
ith th
e ris
er
base
s a
nd
th
e m
id w
ate
r a
rch
b
ase
fra
me
w
ill b
e re
mo
ve
d b
y re
ve
rse
in
sta
llatio
n.
Ro
ckco
ve
r will re
ma
in in
situ
follo
win
g d
eco
mm
issio
nin
g, w
hils
t Ne
xe
n p
ropo
se to
recove
r a
ll ma
ttresses a
nd g
rout b
ag
s th
at a
re n
ot c
ove
red
by ro
ck.
M
oo
ring
lines a
nd
an
ch
ors
2
.6.2
.3
Th
e F
PS
O is
mo
ore
d v
ia 9
mo
orin
g lin
es e
ach
with
a le
ng
th o
f circ
a 1
.5 k
m. E
ach m
oorin
g
line is
a
ttache
d to
an a
nch
or
pile
w
hic
h w
ill b
e cu
t circ
a 3
m b
elo
w th
e su
rface. T
he
mo
orin
g lin
es w
ill b
e re
co
ve
red
to
sh
ore
fo
r re
use/re
cyclin
g.
An
y d
ep
ressio
ns cre
ate
d
durin
g m
oorin
g lin
e re
cove
ry w
ill be le
ft in a
n o
ve
rtraw
lable
co
nd
ition.
M
on
itorin
g fo
r LS
A / N
OR
M
2.6
.2.4
Th
e p
resen
ce o
f LS
A / N
OR
M (L
ow
Sp
ecific
Activ
ity / N
atu
rally
Occu
rring
Ra
dio
activ
e
Ma
teria
l) dep
osits
is a
recog
nis
ed p
he
nom
eno
n in
the o
il and
ga
s in
du
stry
. Th
e p
rod
uctio
n
and W
I syste
ms a
re k
now
n to
be c
onta
min
ate
d w
ith N
OR
M. A
s a
result, tra
ined
pers
onn
el
co
mp
ete
nt in
the u
se o
f radio
activ
ity d
ete
ctio
n m
onito
rs w
ill be o
nb
oa
rd th
e v
essels
used
to
recove
r the s
ubse
a in
frastru
ctu
re a
nd
will m
on
itor a
ll item
s a
s th
ey c
om
e o
n b
oa
rd fo
r th
e p
resen
ce o
f LS
A / N
OR
M.
In th
e e
ve
nt th
at o
ne
or m
ore
recove
red
item
s is
foun
d to
be c
onta
min
ate
d, th
e ite
ms w
ill b
e c
onta
ined
and
se
ale
d a
nd
sh
ippe
d to
sh
ore
for d
eco
nta
min
atio
n b
y a
Ne
xe
n a
pp
rove
d
co
ntra
cto
r und
er N
exe
n’s
and
the c
ontra
cto
r’s m
ana
gem
ent s
yste
ms.
2.6
.3
Ro
ck
Co
ve
r Re
qu
irem
en
ts
Ro
ck c
ove
r will b
e re
qu
ired o
n th
e e
xp
ose
d p
ipelin
e e
nd
s a
nd
on a
nu
mb
er o
f se
ctio
ns
alo
ng
th
e p
ipelin
e w
here
th
e D
epth
o
f C
ove
r (D
oC
) o
r D
epth
of
Lin
e (D
oL)
are
n
ot
co
nsid
ere
d a
deq
uate
(Fig
ure
2-6
).
Fig
ure
2-6
: Sc
he
ma
tic illu
stra
ting
me
an
ing
of D
oC
an
d D
oL
.
Bla
ckb
ird a
nd E
ttrick D
eco
mm
issio
nin
g E
IA
Do
cu
me
nt N
o. E
TR
K0
00
1-G
E-O
000-L
C-R
PT
-0006
Se
pte
mb
er 2
016
P
ag
e 3
9 o
f 109
Estim
ate
d a
dd
itiona
l rock c
ove
r req
uire
me
nts
are
pro
vid
ed
in T
able
2-4
. Th
ese
estim
ate
s
are
base
d o
n p
ipelin
e ro
ute
su
rve
y d
ata
from
20
10
and
2012 (F
ug
ro, 2
010
and
Fug
ro,
2012) a
nd
are
cu
rrently
co
nsid
ere
d in
dic
ativ
e o
f the
req
uire
me
nts
. Prio
r to c
om
me
nce
me
nt
of ro
ck c
ove
r activ
ities N
exe
n w
ill ca
rry o
ut fu
rther p
ipelin
e a
nd
um
bilic
al ro
ute
surv
eys to
d
ete
rmin
e if th
ere
are
an
y o
the
r are
as w
here
the
Do
C o
r Do
L m
ay b
e o
f co
nce
rn. T
he
results
from
these
surv
eys w
ill be d
iscu
ssed
with
BE
IS a
nd
the S
tatu
tory
Co
nsu
ltees to
id
en
tify
the
optim
al
app
roa
ch
to
a
dd
ressin
g
them
. F
or
the
purp
ose
of
this
E
IA,
the
antic
ipate
d ro
ck c
ove
r req
uire
me
nts
as d
ete
rmin
ed
from
the
earlie
r su
rve
ys a
re a
ssesse
d.
Acro
ss th
e p
ipelin
es a
nd
um
bilic
als
associa
ted
with
the E
&B
field
s it is
estim
ate
d fro
m
these
su
rve
ys th
at u
p to
10
,914
te o
f rock c
ove
r will b
e re
qu
ired to
co
ve
r a to
tal o
f 1,7
95
m
of p
ipelin
es/u
mb
ilica
ls im
pactin
g o
n a
corrid
or w
idth
of 7
m (re
sultin
g in
a h
eig
ht o
f rock o
f 1
m). T
his
eq
uate
s to
an
incre
ase o
f 14.5
% o
f the ro
ck a
lread
y in
pla
ce
acro
ss th
e tw
o
field
s (7
5,3
77
t).
Th
e ro
ck q
uantitie
s p
rovid
ed
are
co
nsid
ere
d to
be
co
nse
rva
tive
at th
e tim
e o
f writin
g, a
nd
Ne
xe
n w
ill end
ea
vo
ur to
min
imis
e a
ny a
dd
itiona
l rock p
laced
in th
e fie
ld, w
hils
t pla
cin
g th
e
safe
ty o
f oth
er u
sers
of th
e s
ea (i.e
. fish
erm
en) a
bove
all o
the
r co
nsid
era
tions.
Ta
ble
2-4
: Es
tima
ted
roc
k c
ove
r req
uire
me
nts
.
Pip
elin
e
De
sc
riptio
n
PL
24
43
Ettric
k p
rod
uctio
n
flow
line
P1
Cu
rren
tly ro
ck pla
ce
d a
lon
g th
e m
ajo
rity of
flow
line
. 2
010 su
rve
y da
ta in
dic
ate
s
ave
rag
e D
oC
of 1
.08 m
. Ma
rgin
al D
oC
aro
un
d K
P 0
.9 p
ossib
ly re
qu
iring ro
ck c
ove
r. E
stim
ate
d a
pp
roxim
ate
ly 1
30
m o
f pip
elin
e w
ill requ
ire ro
ck c
ove
r.
PL
24
44
Ettric
k p
rod
uctio
n
flow
line
P2
Cu
rren
tly ro
ck p
lace
d a
lon
g m
ajo
rity o
f flow
line
. 20
10
su
rve
y d
ata
indic
ate
s a
ve
rag
e
Do
C o
f 1.0
4 m
. Ma
rgin
al D
oC
aro
un
d K
P1
.0 a
nd K
P0
.6 p
ossib
ly re
qu
iring
ad
ditio
na
l ro
ck co
ve
r. E
stim
ate
d ap
pro
xim
ate
ly 6
5 m
o
f pip
elin
e w
ill req
uire
ad
ditio
na
l ro
ck
co
ve
r.
PL
24
46
Ettric
k W
I flow
line
20
12 s
urv
ey d
ata
sh
ow
s a
n a
ve
rag
e D
oC
of 0
.80 m
. Ma
in a
rea
s o
f Do
C c
on
ce
rn a
t K
P0
.5, K
P1.0
an
d K
P1
.2, b
ut D
oC
ap
pe
ars
to b
e in
cre
asin
g. P
artic
ula
r co
nce
rn a
t K
P1
.1. E
stim
ate
d a
pp
roxim
ate
ly 5
00
m o
f pip
elin
e w
ill requ
ire a
dditio
na
l rock c
ove
r.
PL
24
46
I2
Ettric
k W
I flow
line
Co
mb
ine
d D
oC
an
d D
oL
su
rve
y d
ata
ind
ica
tes a
n im
pro
vin
g p
rofile
, with
an
are
a o
f co
nce
rn a
rou
nd
KP
1.7
an
d K
P 3
.5. L
imite
d s
urv
ey d
ata
for 1
km
of ro
ute
. Estim
ate
d
ap
pro
xim
ate
ly 1
00
m o
f pip
elin
e w
ill req
uire
ad
ditio
na
l rock c
ove
r.
PL
U2
44
7
Ettric
k m
ain
u
mb
ilica
l
Co
mb
ine
d D
oC
a
nd
D
oL
su
rve
y d
ata
in
dic
ate
s a
rea
s o
f co
nce
rn at
KP
0.5
, a
nd
ma
rgin
al c
once
rn a
t KP
0.7
and
KP
1.1
. Estim
ate
d a
pp
roxim
ate
ly 5
00
m o
f pip
elin
e
will re
qu
ire a
dd
ition
al ro
ck c
ove
r.
PL
24
48
Ga
s e
xp
ort flo
wlin
e
20
12
su
rve
y
da
ta
sh
ow
s
an
ave
rag
e
de
pth
o
f co
ve
r o
f 0
.74
m,
with
m
arg
ina
l co
nce
rns
ove
r m
uch
o
f th
e
rou
te,
pa
rticu
larly
K
P2
.5
an
d
KP
4.0
. E
stim
ate
d
ap
pro
xim
ate
ly 5
00
m o
f pip
elin
e w
ill req
uire
ad
ditio
na
l rock c
ove
r.
Bla
ckb
ird a
nd E
ttrick D
eco
mm
issio
nin
g E
IA
Do
cu
me
nt N
o. E
TR
K0
00
1-G
E-O
000-L
C-R
PT
-0006
Se
pte
mb
er 2
016
P
ag
e 4
0 o
f 109
2.6
.4
Ve
ss
el R
eq
uire
me
nts
A ra
ng
e o
f sp
ecia
list a
nd s
upp
ort v
essels
will b
e re
qu
ired a
t va
riou
s tim
es a
nd
for v
ario
us
dura
tion
s to
su
pp
ort th
e p
rop
osed
deco
mm
issio
nin
g w
ork
sco
pes. In
ord
er to
co
mp
lete
the
P&
A a
ctiv
ities th
e d
rilling
rig is
antic
ipate
d to
be o
n s
tatio
n a
t the E
&B
field
s fo
r aro
un
d 1
year. W
hils
t the d
rilling
rig is
on lo
catio
n a
sta
nd
by v
essel w
ill be p
rese
nt a
t all tim
es a
nd
a
su
pp
ly ve
ssel
will
su
pp
ort
the rig
. T
he n
um
ber
of
days e
stim
ate
d is
co
nse
rva
tive
a
nd
a
llow
s fo
r dela
ys s
uch a
s w
aitin
g o
n w
eath
er.
In a
dd
ition, th
e d
ecom
mis
sio
nin
g a
ctiv
ities w
ill req
uire
a n
um
ber o
f sp
ecia
list a
nd
su
pp
ort
ve
ssels
inclu
din
g D
ive
S
upp
ort V
essels
(DS
Vs), C
onstru
ctio
n S
upp
ort V
essels
(CS
Vs),
An
cho
r Ha
nd
ing
Ve
sse
ls (A
HV
) and
rock c
ove
r ve
ssels
. Th
ese
ve
ssels
will lik
ely
ho
ld th
eir
positio
n u
sin
g d
yn
am
ic p
ositio
nin
g (D
P).
At th
e tim
e o
f writin
g, s
pe
cific
ve
ssels
have
not y
et b
ee
n id
en
tified, h
ow
eve
r, the ty
pes o
f ve
ssel re
qu
ired a
re w
ell k
now
n a
nd
perfo
rma
nce
ch
ara
cte
ristic
s fo
r typ
ica
l ve
ssels
have
b
ee
n a
ssum
ed fo
r the p
urp
ose
s o
f estim
atin
g e
nerg
y c
onsu
mp
tion a
nd
em
issio
ns to
air.
By
estim
atin
g
the
fuel
use
base
d
on
ge
neric
ve
sse
l ty
pes
(Institu
te
of
Petro
leum
G
uid
elin
es
(IoP
), 2
00
0
and
in
du
stry
e
xp
erie
nce
) a
nd
th
e
like
ly
dura
tion
of
the
wo
rk
pro
gra
mm
e fo
r each
vesse
l, estim
ate
s o
f fuel c
onsu
mp
tion c
an b
e m
ade
. Estim
ate
s a
re
sh
ow
n in
Ta
ble
2-5
.
Ta
ble
2-5
: An
ticip
ate
d v
es
sel re
qu
irem
en
ts a
nd
fue
l usa
ge
.
Ve
ss
el
Fu
el
co
ns
um
ptio
n
rate
(Te
/d)
Fu
el u
sa
ge
(T
e)
Typ
e
Du
ratio
n (d
ays
)
Ph
as
e 1
: Su
bse
a S
co
pe
1
DS
V
15
17
.5
26
3
CS
V
25
25
1
62
5
AH
V
30
21
63
0
Ph
as
e 2
: We
ll P&
A
Se
mi-s
ubm
ers
ible
rig
34
0
92
3
,06
0
AH
Vs
18
0
21
3,7
80
Sta
nd
by v
esse
l 3
40
42
1
,36
0
Su
pp
ly v
esse
l in tra
nsit a
nd
on
locatio
n a
ssum
ing
50%
time
in
tran
sit a
nd
50%
on
loca
tion
) 3
40
10
(tran
sit)
1.5
(on lo
ca
tion
) 1
,95
5
Ph
as
e 3
Su
bse
a S
co
pe
2
DS
V
30
17
.5
52
5
CS
V
50
25
1
1,2
50
Ro
ck c
ove
r ve
sse
l 1
5
15
22
5
Gu
ard
ve
sse
l 7
00
42
2,8
00
Tra
wle
r 5
42
2
0
To
tal
16
,493
1. Io
P g
uid
elin
es d
o n
ot a
lwa
ys h
ave
exa
ct e
qu
iva
len
t vessel: e
.g. fo
r the
CS
V –
figu
res fo
r a
Mu
ltipu
rpo
se
Su
pp
ort V
esse
l (MS
V) w
ere
used
. 2
. Ba
se
d o
n In
du
stry
exp
erie
nce
.
Bla
ckb
ird a
nd E
ttrick D
eco
mm
issio
nin
g E
IA
Do
cu
me
nt N
o. E
TR
K0
00
1-G
E-O
000-L
C-R
PT
-0006
Se
pte
mb
er 2
016
P
ag
e 4
1 o
f 109
2.6
.5
Fate
Afte
r Le
avin
g F
ield
Re
cove
red
su
bse
a e
qu
ipm
en
t will b
e re
turn
ed
to q
uaysid
e fo
r initia
l laydo
wn
. It will b
e
transfe
rred
to
an
are
a
desig
nate
d
for
cle
an
ing
a
nd
dis
ma
ntlin
g.
The
site
w
ill h
ave
a
pp
rop
riate
enviro
nm
enta
l an
d o
the
r ope
ratin
g lic
ence
s in
ord
er to
carry
out th
is w
ork
and
will b
e m
ana
ge
d w
ithin
Ne
xe
n's
co
ntra
cto
r assura
nce
pro
cesse
s. T
he e
qu
ipm
ent w
ill be
se
pa
rate
d in
to c
om
pon
en
ts th
at a
re s
uita
ble
for re
use
or fo
r recyclin
g th
roug
h a
ppro
pria
te
wa
ste
recyclin
g c
hain
s.
2.6
.6
Su
rve
y a
nd
Mo
nito
ring
Pro
gra
mm
e
A
post
de
com
mis
sio
nin
g
site
surv
ey
will
be
ca
rried
out
appro
xim
ate
ly
2
ye
ars
afte
r co
mp
letio
n o
f decom
mis
sio
nin
g. S
urv
eys w
ill be u
nd
erta
ke
n a
long
all p
ipelin
e ro
ute
s a
nd
at a
ll site
s w
here
stru
ctu
res h
ave
bee
n re
mo
ve
d. A
ny s
ign
ifica
nt d
ebris
will b
e re
cove
red
fo
r o
nsh
ore
re
cyclin
g o
r d
isp
osa
l. In
de
pe
nd
en
t ve
rifica
tion
of
the se
abe
d sta
te w
ill b
e
obta
ined
by tra
wlin
g th
e tre
nch
ed
pip
elin
e a
rea
s a
nd
a s
tate
me
nt
of c
leara
nce
w
ill b
e
pro
vid
ed
to a
ll rele
va
nt g
ove
rnm
enta
l and n
on
-gove
rnm
enta
l org
anis
atio
ns.
A
post
decom
mis
sio
nin
g
enviro
nm
enta
l se
ab
ed
su
rve
y,
ce
ntre
d
on
the
site
of
the
w
ellh
ea
ds a
nd
insta
llatio
ns w
ill be c
arrie
d o
ut. T
he
obje
ctiv
e o
f the s
urv
ey is
to id
en
tify a
ny
ch
em
ica
l or p
hysic
al d
istu
rba
nces to
the
se
ab
ed fo
llow
ing
deco
mm
issio
nin
g. T
he s
urv
ey
repo
rts w
ill be s
ubm
itted to
BE
IS a
nd
a p
ost m
onito
ring
su
rve
y re
gim
e w
ill be a
gre
ed
.
Bla
ckb
ird a
nd E
ttrick D
eco
mm
issio
nin
g E
IA
Do
cu
me
nt N
o. E
TR
K0
00
1-G
E-O
000-L
C-R
PT
-0006
Se
pte
mb
er 2
016
P
ag
e 4
2 o
f 109
E
NV
IRO
NM
EN
TA
L D
ES
CR
IPT
ION
3
.0
Th
is s
ectio
n d
escrib
es th
e c
urre
nt n
atu
re a
nd
sta
tus o
f the e
nviro
nm
ent a
t the
Ettric
k a
nd
Bla
ckb
ird F
ield
s. A
n u
nd
ers
tand
ing
of th
e e
nviro
nm
en
t is re
qu
ired in
ord
er to
iden
tify th
e
pote
ntia
l e
nviro
nm
enta
l im
pact
and
to
pro
vid
e
a
basis
fo
r a
ssessin
g
the
pote
ntia
l in
tera
ctio
ns o
f the d
ecom
mis
sio
nin
g / m
oth
ba
lling
activ
ities w
ith th
e e
nviro
nm
ent.
Th
e fie
lds lie
pre
dom
inan
tly in
Blo
cks 2
0/2
a a
nd 2
0/3
a in
the O
ute
r Mo
ray F
irth A
rea
c.
80 k
m fro
m s
hore
in 1
10
m w
ate
r dep
th F
igu
re 1
-1. T
he B
lackb
ird fie
ld a
lso
exte
nd
s in
to
Blo
ck 2
0/3
f.
Sta
tuto
ry
EIA
s
and
th
e
associa
ted
E
nviro
nm
enta
l S
tate
me
nts
w
ere
p
rod
uced
fo
r th
e
Ettric
k F
ield
De
ve
lopm
ent (N
exe
n, 2
00
5) a
nd
the B
lackb
ird F
ield
De
ve
lopm
ent (N
exe
n,
2010). In
su
pp
ort o
f these
two
deve
lopm
ents
, a n
um
ber o
f enviro
nm
enta
l su
rve
ys w
ere
u
nd
erta
ke
n
(Fig
ure
3-1
). T
his
se
ctio
n
has
been
p
rep
are
d
with
re
fere
nce
to
ava
ilable
lite
ratu
re, e
xp
ertis
e, p
revio
us e
xp
erie
nce
an
d th
e s
ite s
pe
cific
su
rve
y d
ata
.
F
igu
re 3
-1: L
oc
atio
n o
f Ettric
k a
nd
Bla
ck
bird
field
s a
nd
the
su
rve
ys
un
de
rtak
en
in th
e a
rea
.
Bla
ckb
ird a
nd E
ttrick D
eco
mm
issio
nin
g E
IA
Do
cu
me
nt N
o. E
TR
K0
00
1-G
E-O
000-L
C-R
PT
-0006
Se
pte
mb
er 2
016
P
ag
e 4
3 o
f 109
3.1
P
hysic
al E
nviro
nm
en
t
3.1
.1
Ba
thym
etry
Kn
ow
ledg
e
of
the
bath
ym
etry
in
th
e
are
a
will
help
to
u
nd
ers
tand
th
e
mo
ve
me
nt
of
se
dim
ents
and
possib
le c
onta
min
ants
associa
ted
with
the s
edim
ent. T
he
se
ab
ed
in th
e
vic
inity
of E
&B
su
bse
a in
frastru
ctu
re is
rela
tive
ly fla
t at d
epth
s o
f betw
een
90
and
13
0 m
.
3.1
.2
Wa
ter M
ass
es
, Cu
rren
ts a
nd
Tid
al S
tream
s
Th
e m
ajo
r wa
ter m
asses in
the N
orth
Se
a c
an b
e c
lassifie
d a
s A
tlantic
wa
ter, S
co
ttish
co
asta
l w
ate
r, N
orth
ern
N
orth
S
ea (N
NS
) w
ate
r, N
orw
eg
ian w
ate
r, C
entra
l N
orth
S
ea
(CN
S) w
ate
r, So
uth
ern
No
rth S
ea (S
NS
) wa
ter, J
utla
nd w
ate
r and
Ch
an
ne
l wa
ter (T
urre
ll, 1992). T
he B
lackb
ird D
eve
lopm
ent is
locate
d in
the a
rea
influ
en
ced
by th
e N
orth
ern
No
rth
Se
a w
ate
r mass.
Circ
ula
tion
in
th
e
No
rth
Se
a
is
driv
en
by
a
co
mb
inatio
n
of
win
ds,
tidal
forc
ing
a
nd
topog
raph
ica
lly-s
teere
d in
flow
s. T
he p
redo
min
ant re
gio
na
l curre
nt in
the C
NS
orig
inate
s
from
the v
ertic
ally
we
ll-mix
ed c
oasta
l wa
ter a
nd
Atla
ntic
wa
ter in
flow
of th
e F
air Is
le/D
oole
y
cu
rrent (F
igu
re 3
-2), w
hic
h flo
ws a
rou
nd th
e n
orth
of th
e O
rkn
ey Is
land
s a
nd
into
the N
orth
S
ea (B
MT
Co
rda
h, 1
998
) (NS
TF
, 199
3). T
he b
ackgro
un
d, o
r resid
ua
l, flow
in th
e C
NS
(a
ssocia
ted
with
North
Se
a c
ircu
latio
n p
atte
rns) is
typ
ica
lly 0
.2 m
/s to
wa
rds th
e s
outh
(DT
I, 2001).
Th
e g
enera
l patte
rn o
f wa
ter m
ove
me
nt in
the N
orth
Se
a m
ay b
e s
trong
ly in
fluen
ced
by
sh
ort to
me
diu
m te
rm w
eath
er c
ond
itions, re
sultin
g in
co
nsid
era
ble
se
aso
na
l and
ann
ua
l va
riab
ility (D
TI, 2
00
4).
Th
e w
ate
r curre
nts
in th
e E
&B
deve
lopm
ent a
rea
are
pre
dom
inan
tly d
rive
n b
y th
e F
air Is
le
Cu
rrent a
nd
the D
oole
y C
urre
nt m
ovin
g in
an a
ntic
lockw
ise
dire
ctio
n (D
TI, 2
00
1). T
he tid
al
cu
rrents
rang
e b
etw
een
0.3
9 m
/s a
nd
0.5
m/s
with
surg
e a
nd
win
d d
rive
n c
urre
nts
bein
g
gre
ate
r (BO
DC
(Britis
h O
ce
an
og
rap
hic
Da
ta C
entre
), 199
8).
Bla
ckb
ird a
nd E
ttrick D
eco
mm
issio
nin
g E
IA
Do
cu
me
nt N
o. E
TR
K0
00
1-G
E-O
000-L
C-R
PT
-0006
Se
pte
mb
er 2
016
P
ag
e 4
4 o
f 109
F
igu
re 3
-2: C
urre
nt C
ircu
latio
ns
in th
e N
orth
Sea
(afte
r Tu
rrell, 1
99
2).
3.1
.3
Se
a T
em
pera
ture
an
d S
alin
ity
Th
e te
mp
era
ture
and
salin
ity o
f se
a w
ate
r affe
cts
the fa
te o
f dis
ch
arg
es a
nd
rele
ase
s in
th
e
marin
e
enviro
nm
ent.
Se
a
su
rface
te
mp
era
ture
s
in
the
north
ea
st
Atla
ntic
a
nd
U
K
co
asta
l wa
ters
have
bee
n ris
ing
sin
ce th
e 1
98
0s, m
ost ra
pid
ly in
the S
outh
ern
No
rth S
ea
(SN
S) a
nd th
e E
ng
lish
Cha
nn
el.
Flu
ctu
atio
ns in
sa
linity
are
larg
ely
ca
use
d b
y th
e a
dd
ition o
r rem
ova
l of fre
sh
wa
ter to
/from
th
e s
ea th
roug
h n
atu
ral p
roce
sse
s. T
he s
alin
ity o
f se
aw
ate
r aro
un
d a
n in
sta
llatio
n h
as a
d
irect
influ
en
ce
on th
e
initia
l d
ilutio
n
of
aq
ueo
us
efflu
ents
. A
s
sa
linity
d
ecre
ase
s th
e
so
lubility
of e
ffluents
ge
ne
rally
incre
ase
s. T
he
tem
pera
ture
and s
alin
ity in
the v
icin
ity o
f the
E&
B fie
lds a
re s
how
n in
Ta
ble
3-1
.
Ta
ble
3-1
: Se
aw
ate
r tem
pe
ratu
re a
nd
sa
linity
.
Te
mp
era
ture
(oC
)
Sa
linity
(pp
t) S
um
me
r W
inte
r
Su
rfac
e
Bo
ttom
S
urfa
ce
B
otto
m
13
9
6.5
7
35
Bla
ckb
ird a
nd E
ttrick D
eco
mm
issio
nin
g E
IA
Do
cu
me
nt N
o. E
TR
K0
00
1-G
E-O
000-L
C-R
PT
-0006
Se
pte
mb
er 2
016
P
ag
e 4
5 o
f 109
3.1
.4
Se
dim
en
ts
Un
de
rsta
nd
ing
the ty
pe o
f se
dim
ent in
the a
rea w
ill assis
t in u
nd
ers
tand
ing
the m
ove
me
nt
of th
e s
edim
ent a
nd
con
seq
uently
the im
plic
atio
ns o
f leavin
g in
frastru
ctu
re in
pla
ce. In
a
dd
ition th
e p
lant a
nd
anim
al s
pecie
s fo
un
d in
an a
rea
are
ofte
n c
lose
ly lin
ke
d to
the
se
dim
ent ty
pe, in
partic
ula
r benth
ic s
pecie
s.
Th
e s
edim
ent in
the a
rea o
f the E
ttrick s
ubse
a in
frastru
ctu
re is
sa
nd a
nd m
udd
y s
and
(Fug
ro, 2
00
2) a
nd
the s
ed
ime
nt in
the a
rea o
f the B
lackb
ird d
eve
lopm
ent is
pre
do
min
antly
fin
e s
ilty s
and
to v
ery
fine s
and
s (G
ard
line, 2
01
0a
). An
obse
rve
d in
cre
ase
in fin
es c
lose to
th
e P
B1
we
ll locatio
n w
as a
ttribute
d to
the p
resen
ce o
f fine d
rilling
mu
ds a
ssocia
ted
with
d
rilling
activ
ities.
Po
ckm
ark
s
have
b
ee
n
se
en
in
th
e
Bla
ckb
ird a
rea
, a
ssocia
ted
w
ith
the
nea
r su
rface
ge
olo
gy
of
the
Witc
h
Gro
un
d
Form
atio
ns
(Ga
rdlin
e,
201
0a
). In
th
e
pro
xim
ity
of
the
deve
lopm
ent
itse
lf a
fe
w
sm
all
se
ab
ed
d
ep
ressio
ns
and
o
ne
la
rge
d
ep
ressio
n
we
re
iden
tified,
all
of
wh
ich
h
ave
b
ee
n
attrib
ute
d to
sco
ur
aro
un
d
bou
lders
. T
he
dete
cte
d
pockm
ark
s s
how
ed n
o e
vid
en
ce o
f ga
s le
akag
e o
r Me
tha
ne
-De
rive
d A
uth
ige
nic
Ca
rbo
nate
(M
DA
C) s
tructu
res (M
DA
C is
dis
cu
ssed fu
rther in
Se
ctio
n 3
.2.1
.).
Ch
em
ica
l ana
lysis
on s
edim
ent s
am
ple
s fro
m th
e B
lackb
ird lo
catio
n a
nd
pip
elin
e ro
ute
sh
ow
ed
tota
l o
rga
nic
m
atte
r (T
OM
), to
tal
org
an
ic
ca
rbo
n
(TO
C),
poly
cyclic
a
rom
atic
h
yd
roca
rbo
ns (P
AH
), alk
ane
s a
nd
bariu
m v
alu
es to
ge
ne
rally
be w
ithin
typ
ica
l backg
round
leve
ls fo
r the N
orth
Se
a. H
ow
eve
r the le
ve
ls o
f bariu
m, a
lka
nes, m
erc
ury
, iron, le
ad
and
zin
c w
ere
foun
d to
be a
bo
ve
backg
rou
nd le
ve
ls in
the s
am
ple
take
n c
lose to
the P
B1
we
ll, th
ese
ele
va
ted
leve
ls b
ein
g a
ttribute
d to
his
toric
al d
rilling
co
nta
min
ants
. The
se
dim
ents
in
the E
ttrick a
rea
sh
ow
ed th
at c
once
ntra
tion
s o
f the m
ajo
rity o
f the h
ea
vy m
eta
ls w
ere
with
in
pub
lish
ed
U
KO
OA
(c
urre
ntly
O
il a
nd
G
as U
K)
me
an
co
nce
ntra
tion
s fo
r th
e C
NS
. T
he
exce
ptio
ns (b
ariu
m, iro
n a
nd
lead
) we
re m
ode
rate
ly a
bo
ve
these
pub
lish
ed
va
lues. T
he
tota
l h
yd
roca
rbo
n
co
nce
ntra
tions
and
co
nce
ntra
tion
s
of
n-a
lka
ne
s
an
d
PA
Hs
we
re
co
nsid
ere
d to
repre
sent b
ackg
rou
nd le
ve
ls fo
r the
CN
S.
3.1
.5
Wa
ter Q
uality
Ch
em
ica
l a
na
lysis
w
as n
ot
ava
ilab
le fo
r th
e w
ate
r in
th
e vic
inity
o
f th
e E
ttrick o
r th
e
Bla
ckb
ird d
eve
lopm
ent; h
ow
eve
r, g
ive
n th
e w
ate
r m
ixin
g re
sultin
g fro
m cu
rrents
in
the
are
a a
nd
the c
are
ful re
gula
tion
of d
isch
arg
es it is
antic
ipate
d th
at th
e w
ate
r qu
ality
in th
e
vic
inity
of th
e E
&B
deve
lopm
ents
will b
e ty
pic
al o
f the C
NS
.
3.2
E
nviro
nm
en
tal L
eg
isla
tion
Pro
tec
ting
Hab
itats
an
d S
pecie
s
Th
e E
U H
abita
ts D
irectiv
e (9
2/4
3/E
EC
) and th
e E
U B
irds D
irectiv
e (7
9/4
09/E
EC
) are
the
ma
in d
rivin
g fo
rce
s fo
r safe
gu
ard
ing
bio
div
ers
ity in
Eu
rop
e.
Th
roug
h th
e e
sta
blis
hm
en
t of a
netw
ork
of p
rote
cte
d s
ites th
ese d
irectiv
es p
rovid
e fo
r the
pro
tectio
n of
anim
al
and
p
lant
sp
ecie
s of
Eu
rope
an
im
porta
nce
a
nd
th
e h
ab
itats
th
at
su
pp
ort th
em
.
Bla
ckb
ird a
nd E
ttrick D
eco
mm
issio
nin
g E
IA
Do
cu
me
nt N
o. E
TR
K0
00
1-G
E-O
000-L
C-R
PT
-0006
Se
pte
mb
er 2
016
P
ag
e 4
6 o
f 109
Th
e E
U H
abita
ts D
irectiv
e a
nd
the E
U B
irds D
irectiv
e h
ave
bee
n e
na
cte
d in
the U
K b
y th
e
follo
win
g le
gis
latio
n:
· T
he
Co
nserv
atio
n
(Na
tura
l H
abita
ts,
&c.)
Reg
ula
tion
s
199
4
(as
am
end
ed
) tra
nsp
ose
the H
abita
ts a
nd B
irds D
irectiv
es in
to U
K la
w. T
hey a
pp
ly to
lan
d a
nd
to
territo
rial
wa
ters
o
ut
to
12
nau
tical
mile
s
from
th
e
co
ast
and
h
ave
b
ee
n
su
bse
qu
ently
am
en
ded s
eve
ral tim
es.
· T
he C
onserv
atio
n o
f Hab
itats
and
Sp
ecie
s R
eg
ula
tion
s 2
01
0: T
he C
onserv
atio
n o
f H
abita
ts a
nd
Sp
ecie
s R
eg
ula
tion
s 2
01
0 c
onso
lidate
all th
e v
ario
us a
me
nd
me
nts
m
ade
to th
e C
onserv
atio
n (N
atu
ral H
abita
ts, &
c.) R
eg
ula
tion
s 1
99
4 in
respe
ct o
f E
ng
land
and
Wa
les. In
Sco
tlan
d, th
e H
abita
ts a
nd B
irds D
irectiv
es a
re tra
nsp
ose
d
thro
ug
h a
co
mb
inatio
n o
f the H
abita
ts R
eg
ula
tions 2
01
0 (in
rela
tion
to re
serv
ed
ma
tters
) and th
e 1
99
4 R
eg
ula
tion
s.
· T
he O
ffsh
ore
Ma
rine
Co
nse
rva
tion
(Na
tura
l Ha
bita
ts, &
c.) R
eg
ula
tion
s 2
00
7 (a
s
am
en
ded
200
9 a
nd
201
0): T
hese
reg
ula
tion
s a
re th
e p
rincip
al m
ean
s b
y w
hic
h th
e
Bird
s a
nd
Ha
bita
ts D
irectiv
es a
re tra
nsp
ose
d in
the U
K o
ffsh
ore
marin
e a
rea
(i.e.
outs
ide th
e 1
2 n
m te
rritoria
l limit) a
nd
in E
ng
lish
an
d W
els
h te
rritoria
l wa
ters
.
· T
he O
ffsh
ore
Petro
leum
Activ
ities (C
onse
rva
tion
of H
abita
ts) R
eg
ula
tion
s 2
00
1 (a
s
am
en
ded
200
7): T
hese
reg
ula
tion
s a
pp
ly th
e H
ab
itats
Dire
ctiv
e a
nd
the W
ild B
irds
Dire
ctiv
e in
rela
tion
to o
il and
ga
s p
lans o
r pro
jects
wh
olly
or p
artly
on
the U
nite
d
Kin
gd
om
C
ontin
enta
l S
helf
and
a
dja
ce
nt
wa
ters
o
uts
ide
territo
rial
wa
ters
(i.e
. o
uts
ide th
e 1
2 n
m te
rritoria
l zo
ne
).
· T
he H
abita
ts D
irectiv
e lis
ts th
ose
hab
itats
and
spe
cie
s (A
nne
x I a
nd
II resp
ectiv
ely
) w
hose
co
nse
rva
tion
req
uire
s th
e d
esig
natio
n o
f sp
ecia
l are
as o
f inte
rest. T
hese
hab
itats
and
sp
ecie
s a
re to
be p
rote
cte
d b
y th
e c
reatio
n o
f a s
erie
s o
f ‘Sp
ecia
l A
reas o
f Co
nse
rva
tion
’ (SA
Cs), a
nd
by v
ario
us o
ther s
afe
gu
ard
me
asure
s s
uch a
s
Site
s o
f Co
mm
unity
Impo
rtance (S
CIs
) for p
artic
ula
r sp
ecie
s (T
able
3-2
).
· T
he B
irds D
irectiv
e re
qu
ires m
em
ber s
tate
s to
nom
inate
site
s a
s S
pecia
l Pro
tectio
n
Are
as (S
PA
s). T
og
eth
er w
ith a
do
pte
d S
AC
s, th
e S
PA
netw
ork
form
the
‘Na
tura
2
00
0’ n
etw
ork
of p
rote
cte
d a
rea
s in
the
Eu
rop
ean
Unio
n.
Ta
ble
3-2
: De
finitio
n o
f UK
SA
C/S
CI S
ites
.
Site
D
es
crip
tion
SA
C
SA
Cs
are
site
s
tha
t h
ave
b
ee
n
ad
op
ted
by
the
E
uro
pe
an
C
om
mis
sio
n (E
C) a
nd
form
ally d
esig
nate
d b
y the g
ove
rnm
ent
of e
ach
co
un
try in
wh
ose
territo
ry th
at s
ite lie
s.
Site
of C
om
mu
nity
Im
porta
nce
(SC
Is)
SC
Is a
re s
ites th
at h
ave
be
en
ad
opte
d b
y th
e E
C b
ut n
ot y
et
form
ally
de
sig
na
ted
by th
e g
ove
rnm
ent o
f each
co
un
try.
Ca
nd
ida
te S
AC
(c
SA
C)
Ca
nd
ida
te S
AC
s (c
SA
Cs) a
re s
ites th
at h
ave
be
en s
ubm
itted
to
the
EC
an
d n
ot fo
rma
lly a
do
pte
d.
Po
ssib
le S
AC
(p
SA
C)
Po
ssib
le
SA
Cs
(pS
AC
s)
are
site
s
that
ha
ve
b
ee
n
form
ally
a
dvis
ed to
UK
Go
ve
rnm
ent, b
ut n
ot y
et s
ubm
itted
to th
e E
C.
Dra
ft SA
C (d
SA
C)
Dra
ft S
AC
s
(dS
AC
s)
are
a
rea
s
that
ha
ve
b
een
fo
rma
lly
advis
ed to
UK
go
ve
rnm
ent b
ut n
ot y
et a
pp
rove
d b
y it.
Bla
ckb
ird a
nd E
ttrick D
eco
mm
issio
nin
g E
IA
Do
cu
me
nt N
o. E
TR
K0
00
1-G
E-O
000-L
C-R
PT
-0006
Se
pte
mb
er 2
016
P
ag
e 4
7 o
f 109
BE
IS
co
nsid
ers
a
ll ty
pes
of
SA
C
in
the
sam
e
wa
y,
as
if th
ey
have
a
lread
y
bee
n
desig
nate
d. T
here
fore
, as w
ith S
AC
s, a
ny a
ctiv
ity lik
ely
to h
ave
a s
ign
ifican
t effe
ct o
n th
e
site
of a
cS
AC
, pS
AC
or d
SA
C m
ust b
e a
ppro
pria
tely
assesse
d.
It mu
st b
e d
em
onstra
ted th
at a
ctiv
ities w
ill not s
ign
ifica
ntly
dis
turb
a E
uro
pe
an
Pro
tecte
d
Sp
ecie
s (E
PS
) in a
wa
y th
at w
ill affe
ct e
ither a
lone
or in
co
mb
inatio
n w
ith o
the
r pla
ns a
nd
p
roje
cts
;
· th
e a
bility
of th
e s
pecie
s to
su
rviv
e, b
ree
d, re
ar o
r nurtu
re its
yo
un
g o
r affe
ct its
h
ibern
atin
g o
r mig
ratio
n p
atte
rns (te
rme
d th
e in
jury
offe
nce), o
r
· th
e
local
dis
tributio
n
or
abu
nd
an
ce
of
any
pro
tecte
d
sp
ecie
s
(term
ed
the
dis
turb
an
ce o
ffence
).
3.2
.1
Ha
bita
ts
Of th
e h
ab
itat ty
pes lis
ted in
the H
abita
ts D
irectiv
e (A
nne
x I) re
qu
iring p
rote
ctio
n, fo
ur
occur o
r pote
ntia
lly o
ccur in
the U
K o
ffsh
ore
are
a (J
NC
C, 2
01
2);
· sa
nd
ba
nks w
hic
h a
re s
lightly
co
ve
red
by s
eaw
ate
r at a
ll time
s;
· re
efs
;
o
be
dro
ck re
efs
; mad
e fro
m c
ontin
uo
us o
utc
ropp
ing
s o
f bedro
ck w
hic
h m
ay b
e o
f va
riou
s to
pog
raph
ica
l sha
pe
(e.g
. pin
na
cle
s a
nd
offs
hore
ba
nks);
o
sto
ny re
efs
; ag
gre
gatio
ns o
f bou
lders
and
co
bb
les w
hic
h m
ay h
ave
so
me
finer
se
dim
ents
in in
ters
titial s
pace
s; a
nd
o
bio
ge
nic
re
efs
; fo
rme
d b
y co
ld w
ate
r co
rals
(e
.g.
Lop
he
lia p
ertu
sa)
and
th
e
poly
ch
ae
te w
orm
Sa
be
llaria
sp
inulo
sa;
· su
bm
arin
e s
tructu
res m
ad
e b
y le
akin
g g
ases; a
nd
· su
bm
erg
ed o
r partia
lly s
ubm
erg
ed s
ea c
ave
s.
Th
e n
ea
rest S
CIs
to E
&B
deve
lopm
ents
are
the B
raem
ar P
ockm
ark
s a
nd
the S
ca
nn
er
Po
ckm
ark
SA
Cs w
hic
h lie
c. 1
50
km
east n
orth
east a
nd
93 k
m n
orth
east o
f Blo
ck 2
0/3
re
spe
ctiv
ely
(Fig
ure
3-3
).
Th
e n
eare
st o
nsh
ore
pro
tecte
d s
ite is
the B
uch
an N
ess to
Co
lliesto
n C
oast S
PA
, wh
ich
is
c.7
0 k
m s
outh
we
st o
f the d
eve
lopm
ents
(Fig
ure
3-3
).
Re
ef h
ab
itats
are
liste
d w
ithin
An
ne
x I o
f the H
ab
itats
dire
ctiv
e. L
op
he
lia p
ertu
sa, a
co
ld
wa
ter c
ora
l that fo
rms b
iog
enic
reefs
, is th
ere
fore
co
nsid
ere
d a
pro
tecte
d s
pecie
s u
nd
er
the H
abita
ts D
irectiv
e. S
urv
eys c
arrie
d o
ut in
the
are
a o
f the E
&B
de
ve
lop
me
nts
have
not
iden
tified th
e
pre
se
nce
of
any
L.
pertu
sa;
how
eve
r, it
is kn
ow
n
to
exis
t o
n
offs
hore
in
sta
llatio
ns a
s m
arin
e g
row
th (O
GU
K, 2
01
3). O
nly
natu
rally
gro
win
g re
efs
are
pro
tecte
d
as o
pp
ose
d to
the c
olo
nie
s fo
un
d a
ttache
d to
offs
hore
su
bse
a s
tructu
res; th
e c
olo
nie
s
gro
win
g o
n th
ese
stru
ctu
res a
re n
ot c
lassed
as ‘h
abita
t’ and
ca
n th
ere
fore
be re
mo
ve
d. L
. p
ertu
sa is
als
o lis
ted u
nd
er th
e C
onve
ntio
n o
n In
tern
atio
na
l Tra
de
in E
nda
ng
ere
d S
pecie
s
(CIT
ES
). Cu
rrent g
uid
an
ce fro
m th
e D
epa
rtme
nt fo
r En
viro
nm
ent, F
oo
d a
nd R
ura
l Affa
irs
(DE
FR
A) is
that C
ITE
S re
qu
irem
ents
are
dis
applie
d fo
r L. p
ertu
sa
atta
che
d to
ma
nm
ade
stru
ctu
res, p
rovid
ed
that it is
dis
pose
d o
f (OG
UK
, 201
3).
‘Su
bm
arin
e s
tructu
res m
ade
by le
akin
g g
ase
s’ a
re d
efin
ed
by th
e H
abita
ts D
irectiv
e a
s
co
mp
risin
g M
DA
C th
at
form
s ro
ck-lik
e sla
bs,
pa
ve
me
nts
a
nd
p
illars
cre
ate
d th
roug
h a
pro
ce
ss o
f pre
cip
itatio
n w
here
the c
arb
on
ate
cem
ents
the s
and
(Ju
dd, 2
001
). Th
ere
we
re
no
MD
AC
fe
atu
res
iden
tified
in
the
su
rve
ys
ca
rried
out
in
the
are
a
of
the
E&
B
deve
lopm
ents
.
Bla
ckb
ird a
nd E
ttrick D
eco
mm
issio
nin
g E
IA
Do
cu
me
nt N
o. E
TR
K0
00
1-G
E-O
000-L
C-R
PT
-0006
Se
pte
mb
er 2
016
P
ag
e 4
8 o
f 109
3.2
.2
Sc
ottis
h M
arin
e P
rote
cte
d A
rea
s
Un
de
r the M
arin
e (S
co
tlan
d) A
ct a
nd
the U
K M
arin
e a
nd
Co
asta
l Acce
ss A
ct (2
00
9) th
e
Sco
ttish
MP
A P
roje
ct
led b
y M
arin
e S
co
tlan
d in
p
artn
ers
hip
with
the S
NH
, JN
CC
a
nd
o
the
rs d
esig
nate
d 3
0 N
atu
re C
onse
rva
tion
M
arin
e P
rote
cte
d A
reas (N
CM
PA
s)
in Ju
ly
201
4.
Th
ese N
CM
PA
s w
ere
ch
ose
n b
ase
d o
n:
· T
he c
ontrib
utio
n o
f exis
ting p
rote
cte
d a
rea a
na
lysis
;
· C
ontrib
utio
n o
f oth
er a
rea
-base
d m
easure
s; a
nd
· C
ontrib
utio
n o
f least d
am
ag
e/m
ore
natu
ral lo
catio
ns.
Th
e n
eare
st N
CM
PA
to th
e E
&B
de
ve
lopm
ents
is T
urb
ot B
ank c
.40
km
sou
th o
f Blo
ck 2
0/2
(F
igure
3-3
). Th
e T
urb
ot B
ank N
CM
PA
is lo
cate
d o
ff the e
ast c
oast o
f Sco
tlan
d, a
nd
lies
with
in a
n a
rea
of s
and
y s
edim
ent. It in
clu
de
s p
art o
f the s
helf b
ank a
nd
mo
un
d k
now
n a
s
‘Tu
rbot B
ank’, a
n a
rea
of im
porta
nce
for s
and
ee
ls w
here
they liv
e b
urie
d in
the s
and
for
mo
nth
s a
t a tim
e.
In
add
ition
to
the
d
esig
nate
d
NC
MP
As,
four
possib
le
MP
A
(pM
PA
) se
arc
h
locatio
ns
rem
ain
. Th
ese
are
as w
ill be a
ssesse
d o
nce
SN
H h
ave
ga
the
red th
e re
leva
nt e
vid
en
ce
to
su
pp
ort
their
desig
natio
n.
Th
e n
eare
st
pM
PA
se
arc
h lo
catio
n to
E
&B
is
th
e S
outh
ern
T
ren
ch p
MP
A s
earc
h lo
ca
tion
locate
d c
.46 k
m w
est o
f the
field
s. T
he
se
arc
h lo
catio
n is
sh
ap
ed
aro
un
d th
e S
outh
ern
Tre
nch
, a la
rge u
nde
rse
a v
alle
y c
onsis
ting
of a
n a
rea o
f dee
p
wa
ter (~
20
0 m
) exte
nd
ing
alo
ng
the s
outh
of th
e o
ute
r Mo
ray F
irth,
c.1
0 k
m fro
m th
e
co
ast. T
he S
outh
ern
Tre
nch is
an e
xa
mp
le o
f an e
nclo
sed
(gla
cia
l) se
ab
ed
basin
and
is
reg
ard
ed
a
s scie
ntific
ally
im
porta
nt
to u
nd
ers
tan
d ic
e sh
ee
t d
rain
ag
e p
atte
rns in
th
is
reg
ion.
Bla
ckb
ird a
nd E
ttrick D
eco
mm
issio
nin
g E
IA
Do
cu
me
nt N
o. E
TR
K0
00
1-G
E-O
000-L
C-R
PT
-0006
Se
pte
mb
er 2
016
P
ag
e 4
9 o
f 109
F
igu
re 3
-3: L
oc
atio
n o
f the
Ettric
k a
nd
Bla
ckb
ird fie
lds
in re
latio
n to
are
as
of c
on
se
rva
tion
.
Bla
ckb
ird a
nd E
ttrick D
eco
mm
issio
nin
g E
IA
Do
cu
me
nt N
o. E
TR
K0
00
1-G
E-O
000-L
C-R
PT
-0006
Se
pte
mb
er 2
016
P
ag
e 5
0 o
f 109
3.2
.3
Sp
ec
ies
Th
ere
is g
row
ing
inte
rest in
the d
esig
natio
n o
f fish
sp
ecie
s re
qu
iring
sp
ecia
l pro
tectio
n in
U
K w
ate
rs w
ith p
artic
ula
r focus o
n la
rge s
low
gro
win
g s
pecie
s s
uch
as s
hark
s a
nd ra
ys.
Th
e
Wild
life
and
C
oun
trysid
e
Act
198
1
co
nso
lidate
s
and
a
me
nd
s
exis
ting
n
atio
na
l le
gis
latio
n to
imp
lem
ent
the C
onve
ntio
n o
n th
e C
onse
rva
tion
of
Eu
rope
an
Wild
life a
nd
Na
tura
l H
abita
ts (th
e B
ern
C
onve
ntio
n)
and
th
e B
irds D
irectiv
e.
Th
e A
ct
make
s it
an
offe
nce
to in
tentio
na
lly k
ill, inju
re, p
osse
ss o
r trade
any a
nim
al lis
ted in
Sch
ed
ule
5 a
nd
to
inte
rfere
w
ith p
laces u
sed
b
y su
ch a
nim
als
fo
r sh
elte
r or
pro
tectio
n.
The
re a
re tw
elv
e
Sch
ed
ule
5 fis
h s
pecie
s o
ccurrin
g in
UK
ma
rine
an
d e
stu
arin
e w
ate
rs. O
f these
, those
that
co
uld
pote
ntia
lly o
ccur in
the a
rea
are
the A
llis s
had
(Alo
sa a
losa), th
e tw
aite
sh
ad
(Alo
sa
falla
x), th
e b
askin
g s
hark
(Ceto
rhin
us m
axim
us) a
nd
the a
ng
el s
hark
(Squ
atin
a s
qua
tina).
Alth
ou
gh
pre
sen
t with
in th
e N
orth
Se
a th
e s
pecie
s lis
ted a
bo
ve
are
wid
ely
dis
pers
ed a
nd
m
any a
re u
nco
mm
on a
nd
are
unlik
ely
to b
e fo
und
in p
artic
ula
r co
nce
ntra
tions w
ithin
the
E
&B
are
a.
Fo
ur
ma
rine
m
am
ma
l sp
ecie
s lis
ted u
nd
er
An
ne
x II
of
the H
ab
itats
D
irectiv
e o
ccur
in
rela
tive
ly la
rge
nu
mb
ers
in U
K o
ffsh
ore
wa
ters
;
· G
rey s
eal (H
alic
hore
rus g
ryp
us);
· H
arb
ou
r se
al (P
hoca v
itulin
a);
· B
ottle
no
se d
olp
hin
(Turs
iops tru
nca
tus); a
nd
· H
arb
ou
r porp
ois
e (P
hoco
en
a p
ho
coe
na).
Th
e b
ottle
no
se d
olp
hin
an
d th
e h
arb
ou
r porp
ois
e, lik
e a
ll the c
eta
cea
n s
pecie
s fo
un
d in
UK
w
ate
rs, a
lso
have
EP
S sta
tus, a
long
with
se
ve
ral o
the
r ma
rine
mam
mals
foun
d in
UK
w
ate
rs.
3.2
.4
Prio
rity M
arin
e F
ea
ture
s
In a
dd
ition to
the lis
t of fe
atu
res o
f natu
re c
onserv
atio
n im
po
rtance
, iden
tified a
s p
art o
f the
Sco
ttish
MP
A P
roje
ct, S
NH
and
JN
CC
have
co
mp
iled a
se
para
te lis
t of 8
0 h
ab
itats
and
sp
ecie
s, te
rme
d P
riority
Ma
rine
Fea
ture
s (P
MF
s) w
hic
h a
re c
onsid
ere
d to
be o
f partic
ula
r im
porta
nce
in S
co
tlan
d’s
se
as. T
he p
urp
ose
of th
is lis
t (cu
rrently
in d
raft fo
rm) is
to g
uid
e
polic
y d
ecis
ions re
ga
rdin
g c
onse
rva
tion
in S
co
ttish
wa
ters
(JN
CC
, 201
2).
3.3
M
arin
e F
lora
an
d F
au
na
3.3
.1
Pla
nk
ton
Pla
nkto
n are
driftin
g org
anis
ms th
at
inha
bit
the
p
ela
gic
zo
ne
of
a b
od
y o
f w
ate
r a
nd
inclu
de
sin
gle
ce
lled o
rga
nis
ms s
uch a
s b
acte
ria a
s w
ell a
s p
lants
(phyto
pla
nkto
n) a
nd
anim
als
(zo
op
lankto
n). P
hyto
pla
nkto
n a
re th
e p
rima
ry p
rod
ucers
of o
rgan
ic m
atte
r in th
e
ma
rine
en
viro
nm
ent a
nd
form
the b
asis
of m
arin
e e
cosyste
m fo
od
ch
ain
s. T
hey a
re g
raze
d
on b
y z
oop
lankto
n a
nd
larg
er s
pecie
s s
uch
as fis
h, b
irds a
nd
ceta
cea
ns. T
here
fore
, the
dis
tributio
n o
f pla
nkto
n d
irectly
influ
en
ces th
e m
ove
me
nt a
nd
dis
tributio
n o
f oth
er m
arin
e
sp
ecie
s.
Th
e p
lankto
nic
a
sse
mb
lag
e in
th
e are
a of
the B
lackb
ird a
nd
E
ttrick D
eve
lopm
ents
is
co
nsid
ere
d ty
pic
al o
f the N
orth
Se
a. T
he p
hyto
pla
nkto
n c
om
mu
nity
in th
e N
NS
and
CN
S is
d
om
inate
d
by
the
din
ofla
ge
llate
g
enu
s
Cera
tium
a
nd
th
e
dia
tom
g
enu
s
Ch
ae
tocero
s
(Jo
hn
s &
R
eid
, 2
00
1).
Th
e zo
op
lankto
n com
mu
nitie
s a
cro
ss th
e w
hole
N
orth
S
ea a
re
Bla
ckb
ird a
nd E
ttrick D
eco
mm
issio
nin
g E
IA
Do
cu
me
nt N
o. E
TR
K0
00
1-G
E-O
000-L
C-R
PT
-0006
Se
pte
mb
er 2
016
P
ag
e 5
1 o
f 109
bro
ad
ly sim
ilar.
Th
e m
ost
abu
nd
an
t g
roup
is
th
e co
pe
po
ds,
wh
ich
a
re d
om
inate
d b
y
Ca
lanu
s s
pecie
s (J
ohn
s &
Re
id, 2
00
1). T
he la
rger z
oop
lankto
n (o
r meg
ap
lankto
n) o
f the
No
rth S
ea in
clu
de
the e
uph
au
siid
s (k
rill), thalia
ce
a (s
alp
s a
nd
dolio
lids), s
ipho
no
ph
ore
s
and
me
du
sae (je
llyfis
h) (D
TI, 2
00
4).
Th
e c
om
po
sitio
n a
nd
abu
nd
an
ce o
f pla
nkto
n c
om
mu
nitie
s v
ary
thro
ug
ho
ut th
e y
ear a
nd
are
influ
en
ced
by s
eve
ral fa
cto
rs in
clu
din
g s
unlig
ht, d
ep
th, tid
al m
ixin
g, n
utrie
nt a
va
ilability
a
nd
tem
pe
ratu
re s
tratific
atio
n. S
pecie
s d
istrib
utio
n is
dire
ctly
influ
en
ced
by te
mp
era
ture
, sa
linity
, w
ate
r inflo
w a
nd
the p
rese
nce o
f local b
en
thic
co
mm
unitie
s (C
ole
bro
ok, 1
98
2;
Ro
bin
son
, 197
0).
Pla
nkto
n a
re vu
lnera
ble
to to
xic
e
ffects
of
both
ch
em
ica
l a
nd
hyd
rocarb
on
d
isch
arg
es,
how
eve
r, as p
lankto
n s
pecie
s c
om
mo
nly
have
sh
ort life
cycle
s a
nd th
ere
tend
s to
be a
co
ntin
ua
l e
xch
an
ge
of
indiv
idua
ls w
ith th
e su
rroun
din
g w
ate
r th
ey ca
n b
e e
xp
ecte
d to
re
cove
r re
lativ
ely
q
uic
kly
fo
llow
ing
a
n
eve
nt;
for
exa
mp
le,
dis
ch
arg
e
of
pro
du
ctio
n
ch
em
ica
ls to
the s
ea.
3.3
.2
Be
nth
os
Ba
cte
ria,
pla
nts
a
nd
a
nim
als
liv
ing
o
n o
r w
ithin
th
e se
ab
ed
se
dim
ents
a
re co
llectiv
ely
re
ferre
d
to
as
benth
os.
Sp
ecie
s
livin
g
on
top
of
the
se
a
floor
ma
y
be
se
ssile
(e
.g.
se
aw
eed
s) o
r freely
mo
vin
g (e
.g. s
tarfis
h) a
nd
are
co
llectiv
ely
refe
rred to
as e
pib
en
thic
o
rga
nis
ms. A
nim
als
livin
g w
ithin
the s
edim
ent a
re te
rme
d in
faun
al s
pecie
s (e
.g. c
lam
s,
tube
wo
rms a
nd
burro
win
g c
rabs) w
hile
anim
als
livin
g o
n th
e s
urfa
ce a
re te
rme
d e
pifa
un
al
(e.g
. mu
ssels
, cra
bs, s
tarfis
h a
nd flo
un
de
r). Se
mi-in
faun
al a
nim
als
, inclu
din
g s
ea p
en
s a
nd
so
me
biv
alv
es, lie
pa
rtially
burie
d in
the s
eab
ed
.
Th
e sam
plin
g u
nd
erta
ke
n in
th
e E
&B
a
rea
sho
we
d th
e b
en
tho
s to
be
b
oth
ric
h a
nd
rela
tively
abu
nd
an
t with
hig
h s
pecie
s ric
hne
ss g
ivin
g h
igh
div
ers
ity a
t all s
am
ple
locatio
ns.
Th
e m
acro
faun
a fo
un
d in
the a
rea w
as c
hara
cte
ristic
of th
e fin
e s
and s
ubstra
tes o
f the
CN
S a
nd
a
ny m
inor
va
riatio
ns g
enera
lly re
flecte
d th
e se
dim
ent
typ
e o
f th
e in
div
idua
l sta
tion
s (E
lefth
erio
u &
Ba
sfo
rd, 1
98
9).
Th
e b
enth
ic in
faun
al c
om
mu
nitie
s in
the E
&B
are
a a
re ty
pic
al o
f the C
NS
with
the n
orm
al
poly
ch
ae
te d
om
inate
d s
tructu
re e
xh
ibitin
g h
igh d
ive
rsity
and
mo
de
rate
abu
nd
an
ces.
In te
rms o
f the in
div
idua
l sp
ecie
s, th
e b
enth
ic in
faun
al c
om
mu
nity
stru
ctu
re d
em
onstra
tes
a g
reat
dea
l o
f sta
bility
o
ve
r th
e tim
e th
e su
rve
ys w
ere
co
nd
ucte
d.
No
in
dic
atio
ns o
f a
nth
rop
og
enic
influ
en
ce w
ere
dete
cte
d a
pa
rt from
at a
sin
gle
sta
tion
in a
sin
gle
ye
ar (c
lose
to th
e P
B1 w
ell) a
nd
no c
om
mu
nitie
s o
f co
nserv
atio
n in
tere
st w
ere
identifie
d.
An
aly
sis
of s
am
ple
s fro
m a
cro
ss th
e w
ider n
ea
rby B
uzza
rd re
gio
n, s
how
the E
&B
sa
mp
les
to b
e s
imila
r to th
e w
ider a
rea
(Ne
xe
n a
nd
Ge
nesis
, 201
4b).
Th
e e
pifa
un
al c
om
mu
nity
ca
n b
e d
escrib
ed
as re
lativ
ely
dep
au
pe
rate
, co
mp
risin
g m
ain
ly
se
ap
en
s
(Pe
nn
atu
la
pho
sph
ore
a)
and
sp
ars
ely
d
istrib
ute
d
meg
afa
un
al
burro
ws.
Th
e
den
sity
of th
e s
eap
en
s o
bse
rve
d w
as n
ot c
onsid
ere
d s
uffic
ient to
exp
licitly
cla
ssify
the
are
a a
s ‘s
eap
en a
nd
burro
win
g m
eg
afa
un
a c
om
mu
nitie
s’ a
nd
it is u
nlik
ely
that th
is a
rea
wo
uld
be s
ele
cte
d to
be re
pre
senta
tive
of th
is h
ab
itat P
riority
Ma
rine
Fea
ture
(PM
F). O
ve
r tim
e, th
e e
pifa
un
al c
om
mu
nitie
s e
xh
ibite
d a
sta
ble
stru
ctu
re b
ut th
e h
ab
itats
, thoug
h s
table
w
ere
une
xce
ptio
na
l (Ne
xen
an
d G
ene
sis
, 201
4b
).
Fau
na
iden
tified fro
m s
ea
be
d p
ho
tog
raph
y in
clu
de
d o
ccasio
na
l hag
fish
(Myxin
e g
lutin
osa),
se
ap
en
s (P
enn
atu
la p
hosp
ho
rea
), possib
le h
yd
roid
s, b
ryo
zo
an
s, h
erm
it cra
bs (P
ag
urid
ae)
and
p
ossib
le
No
rwa
y
lobste
r (N
ephro
ps
norv
egic
us)
burro
ws
and
sp
ecim
ens
of
N.
norv
egic
us.
Bla
ckb
ird a
nd E
ttrick D
eco
mm
issio
nin
g E
IA
Do
cu
me
nt N
o. E
TR
K0
00
1-G
E-O
000-L
C-R
PT
-0006
Se
pte
mb
er 2
016
P
ag
e 5
2 o
f 109
3.3
.3
Fis
h a
nd
Sh
ellfis
h
At p
rese
nt m
ore
than
330
fish
sp
ecie
s a
re th
oug
ht to
inha
bit th
e s
he
lf sea
s o
f the U
KC
S
(Pin
ne
gar
et
al.,
201
0).
Pe
lag
ic
sp
ecie
s
(e.g
. h
errin
g
(Clu
pe
a
hare
ng
us),
ma
ckere
l (S
co
mb
er
sco
mbru
s),
blu
e
wh
iting
(M
icro
me
sis
tius
pou
tasso
u)
and
sp
rat
(Spra
ttus
sp
rattu
s)) a
re fo
un
d in
mid
-wa
ter a
nd
typ
ica
lly m
ake
exte
nsiv
e s
easo
na
l mo
ve
me
nts
or
mig
ratio
ns.
De
me
rsa
l sp
ecie
s
(e.g
. co
d
(Ga
du
s
mo
rhu
a),
had
do
ck
(Me
lano
gra
mm
us
aeg
lefin
us), s
and
ee
ls (A
mm
odyte
s to
bia
nu
s), s
ole
(So
lea s
ole
a) a
nd
wh
iting
(Me
rlan
giu
s
me
rlan
gu
s)) liv
e o
n o
r nea
r the s
eab
ed
and
, sim
ilar to
pela
gic
sp
ecie
s, m
an
y a
re k
now
n to
p
assiv
ely
mo
ve
(e.g
. driftin
g e
gg
s a
nd
larv
ae) a
nd
/or a
ctiv
ely
mig
rate
(e.g
. juve
nile
s a
nd
a
du
lts) b
etw
een
are
as d
urin
g th
eir life
cycle
.
Fis
h
occup
yin
g
are
as
in
clo
se
pro
xim
ity
to
offs
hore
o
il a
nd
g
as
insta
llatio
ns
will
be
e
xp
ose
d
to
aq
ueo
us
dis
ch
arg
es
and
m
ay
accum
ula
te
hyd
rocarb
on
s
and
o
ther
co
nta
min
atin
g c
hem
ica
ls in
their b
od
y tis
su
es. T
he
mo
st v
uln
era
ble
sta
ges o
f the life
cycle
of fis
h to
ge
ne
ral d
istu
rban
ces s
uch a
s d
isru
ptio
n to
se
dim
ents
and
oil p
ollu
tion
are
the
egg
a
nd
la
rva
l sta
ge
s.
He
nce
re
cog
nitio
n of
sp
aw
nin
g a
nd
n
urs
ery
g
rou
nds w
ithin
a
d
eve
lopm
ent a
rea is
impo
rtant.
Th
e E
&B
deve
lopm
ents
lie in
Blo
cks 2
0/2
and
20/3
. Kn
ow
n fis
h s
paw
nin
g a
nd n
urs
ery
g
roun
ds in
the
vic
inity
of th
ese
blo
cks a
re s
how
n in
Ta
ble
3-3
. In a
dd
ition to
those
sp
ecie
s
liste
d in
Ta
ble
3-3
, Ellis
e
t al. (2
01
2) lis
t a n
um
ber o
f sp
ecie
s th
at u
se
the a
rea
as a
n
urs
ery
g
roun
d
inclu
din
g
spu
rdog
(S
qua
lus
aca
nth
ias),
sp
otte
d
ray
(Ra
ja
mo
nta
gu
i), h
errin
g,
co
d,
ling
(M
olv
a
mo
lva)
and
h
ake
(M
erlu
cciu
s
me
rlucciu
s).
Of
the
sp
ecie
s
iden
tified, m
ackere
l, No
rwa
y p
ou
t, co
d, w
hitin
g, s
and
ee
ls, b
lue w
hitin
g, h
errin
g a
nd
ling
have
be
en a
ssesse
d b
y S
NH
and
JN
CC
as P
MF
in S
co
tlan
d (J
NC
C, 2
01
2).
Ta
ble
3-3
: Fis
h s
paw
nin
g (S
) an
d n
urs
ery
(N) g
rou
nd
s in
Blo
ck
s 2
0/2
an
d 2
0/3
(Co
ull e
t al., 1
998
).
Sp
ecie
s
J
F
M
A
M
J
J
A
S
O
N
D
Nu
rse
ry
Wh
iting
S
S
S
S
S
N
Le
mo
n s
ole
S
S
S
S
S
S
N
No
rwa
y p
ou
t S
S
* S
* S
N
Sp
rat
S*
S*
S
S
N
Ne
ph
rop
s
S
S
S
S*
S*
S*
S
S
S
S
S
S
N
Sa
nd
ee
l S
S
S
S
N
Ha
dd
oc
k
N
Blu
e w
hitin
g
N
*Pe
riod o
f hig
hest le
ve
ls o
f sp
aw
nin
g
No
te th
at n
urs
ery
gro
un
ds m
ay b
e in
use
thro
ug
hou
t the y
ear.
Ma
rine
Sco
tlan
d h
as re
gis
tere
d a
‘perio
d o
f co
nce
rn’ fo
r se
ism
ic a
nd
drillin
g a
ctiv
ity in
the
vic
inity
of B
lock 2
0/0
2 a
nd
Blo
ck 2
0/0
3 fro
m F
ebru
ary
to J
un
e (D
EC
C, 2
01
4a
).
3.3
.4
Ma
rine M
am
ma
ls
Ma
rine
ma
mm
als
inclu
de
ce
tace
ans (w
hale
s, d
olp
hin
s a
nd
porp
ois
es), p
innip
ed
s (s
eals
) a
nd
mu
ste
lids (o
tters
), all o
f wh
ich
are
su
sceptib
le to
anth
ropog
enic
stre
sses. T
hey a
re
als
o a
ffecte
d in
dire
ctly
by a
ny p
roce
sse
s th
at m
ay a
ffect p
rey a
va
ilab
ility.
Bla
ckb
ird a
nd E
ttrick D
eco
mm
issio
nin
g E
IA
Do
cu
me
nt N
o. E
TR
K0
00
1-G
E-O
000-L
C-R
PT
-0006
Se
pte
mb
er 2
016
P
ag
e 5
3 o
f 109
M
uste
lids
3.3
.4.1
On
ly fre
shw
ate
r otte
rs a
re to
be fo
un
d in
Eu
rop
ea
n w
ate
rs a
nd
hen
ce ro
utin
e o
ffsh
ore
oil
and
ga
s a
ctiv
ities d
o n
ot d
irectly
affe
ct th
ese m
am
ma
ls. H
ow
eve
r, nois
e w
ithin
the w
ate
r co
lum
n o
r oil w
ashe
d a
sho
re fro
m e
xtre
me
oil s
pills
co
uld
imp
act o
tters
. On
e s
uch e
ffect is
h
yp
oth
erm
ia re
sultin
g fro
m th
e o
tters
’ fur b
ein
g c
ove
red
in o
il and
no lo
ng
er b
ein
g a
ble
to
functio
n a
s a
therm
al la
yer.
P
inn
iped
s
3.3
.4.2
Tw
o s
pecie
s o
f se
als
live
and
bre
ed
in U
K w
ate
r: gre
y s
eals
(Ha
lich
oe
rus g
ryp
us) a
nd
harb
ou
r (als
o c
alle
d c
om
mo
n) s
eals
(Ph
oca
vitu
lina). T
hey o
ccur a
long
the
Ab
erd
ee
nsh
ire
co
ast a
nd h
ave
hau
l-out s
ites in
se
ve
ral lo
catio
ns, in
clu
din
g a
t the S
and
s o
f Forv
ie N
atu
re
reserv
e, c
.90 k
m w
est o
f the E
&B
de
ve
lopm
ents
(SN
H, 2
00
9). B
oth
of th
ese
se
al s
pecie
s
are
pro
tecte
d u
nd
er A
nne
x II o
f the E
C H
abita
ts D
irectiv
e.
Tra
ckin
g o
f indiv
idua
l gre
y s
eals
has s
how
n th
at th
ey c
an fe
ed u
p to
se
ve
ral h
un
dre
d k
m
offs
hore
alth
oug
h m
ost fo
rag
ing te
nd
s to
be w
ithin
c.1
00
km
. Th
e fo
rag
ing
rang
e o
f the
harb
ou
r se
al is
typ
ica
lly w
ithin
40 –
50 k
m (S
CO
S, 2
01
1). G
ive
n th
e d
ista
nce
of th
e E
&B
fie
lds fro
m th
e c
oast it is
unlik
ely
that h
arb
our s
eals
will o
ccur. It is
possib
le th
at g
rey s
eals
m
ay fo
rag
e in
the a
rea, h
ow
eve
r base
d o
n o
bserv
ed fo
rag
ing
rang
es n
um
bers
wo
uld
be
exp
ecte
d to
be lo
w.
C
eta
ce
an
s
3.3
.4.3
Sig
htin
gs o
f se
ve
ral s
pecie
s o
f ceta
cea
n h
ave
bee
n re
cord
ed o
n th
e E
uro
pea
n c
ontin
en
tal
sh
elf. H
ow
eve
r in m
any in
sta
nce
s w
ithin
the N
orth
Se
a re
cord
ed
sig
htin
gs a
re a
sso
cia
ted
with
sin
gle
indiv
idua
ls (R
eid
et a
l., 200
3). C
eta
ce
an
sp
ecie
s s
igh
ted
just o
nce
or in
ve
ry
low
n
um
bers
in
th
e N
orth
S
ea in
clu
de
w
hale
s (e
.g.
se
i, fin
, p
yg
my sp
erm
, C
urv
ier’s
b
ea
ke
d,
hum
pba
cke
d an
d b
eake
d)
and
d
olp
hin
s (e
.g.
sh
ort
beake
d co
mm
on d
olp
hin
, strip
ed
dolp
hin
and R
isso
’s d
olp
hin
). Kille
r wh
ale
s a
nd
long
finn
ed
pilo
t wh
ale
s h
ave
bee
n
sig
hte
d
in
rela
tive
ly
hig
her
num
bers
in
th
e
NN
S
wh
ile
larg
e
num
be
rs
of
com
mon
bottle
no
se d
olp
hin
s a
re to
be
foun
d a
long
the c
oasta
l reg
ions o
f the U
K (R
eid
et a
l., 200
3).
Ha
rbo
ur
porp
ois
e,
min
ke
w
hale
, w
hite
-bea
ked
d
olp
hin
, w
hite
-sid
ed
d
olp
hin
, R
isso
’s
dolp
hin
and
kille
r wh
ale
have
bee
n s
igh
ted
in th
e a
rea
of Q
uad
rant 2
0 a
s s
how
n in
Ta
ble
3-4
(Re
id e
t al., 2
00
3). D
ata
indic
ate
that m
inke w
ha
le, k
iller w
hale
, bottle
no
se d
olp
hin
, w
hite
-sid
ed
d
olp
hin
a
nd
R
isso
’s d
olp
hin
o
ccur
in re
lativ
ely
lo
w a
bu
nd
an
ce (0
.01-0
.09
anim
als
/km
of s
urv
ey tra
ck) (E
va
ns, 1
99
2). T
he
den
sitie
s o
f wh
ite-b
ea
ke
d d
olp
hin
and
harb
ou
r p
orp
ois
e va
ry fro
m lo
w to
hig
h (0
.2-0
.49 a
nim
als
/km
) th
roug
ho
ut
the ye
ar
but
app
ea
r to b
e re
lativ
ely
hig
h in
the s
um
mer m
onth
s (E
va
ns, 1
99
2).
Bla
ckb
ird a
nd E
ttrick D
eco
mm
issio
nin
g E
IA
Do
cu
me
nt N
o. E
TR
K0
00
1-G
E-O
000-L
C-R
PT
-0006
Se
pte
mb
er 2
016
P
ag
e 5
4 o
f 109
Ta
ble
3-4
: Sig
htin
gs
of c
eta
ce
an
s in
Qu
ad
ran
t 20 (R
eid
et a
l., 20
03
).
Sp
ecie
s
J
F
M
A
M
J
J
A
S
O
N
D
Min
ke
wh
ale
Kille
r wh
ale
Bo
ttlen
ose
do
lphin
Wh
ite-b
ea
ke
d d
olp
hin
Wh
ite-s
ided
dolp
hin
Ris
so
's d
olp
hin
Ha
rbou
r porp
ois
e
Ba
sed
o
n sh
ipbo
ard
surv
eys (S
MR
U,
200
8),
estim
ate
d d
en
sitie
s of
min
ke
w
hale
s a
nd
h
arb
ou
r porp
ois
es w
ithin
the a
rea
of th
e d
eve
lopm
ent a
nd
tow
ard
s th
e c
oast a
re 0
.028
and
0.2
94
anim
als
per k
m2 re
spe
ctiv
ely
. Estim
atin
g d
en
sitie
s o
f wh
ite b
ea
ke
d a
nd
wh
ite
sid
ed
do
lphin
s s
ep
ara
tely
is m
ore
diffic
ult d
ue
to th
eir p
hysic
al s
imila
rities.
3.3
.5
Se
ab
irds
Se
ab
irds a
re g
enera
lly n
ot a
t risk fro
m ro
utin
e o
ffsh
ore
pro
du
ctio
n o
pe
ratio
ns. H
ow
eve
r, th
ey m
ay b
e vu
lnera
ble
to
p
ollu
tion
fro
m le
ss re
gu
lar
offs
hore
activ
ities su
ch a
s w
ell
testin
g a
nd
flarin
g, w
hen
hyd
roca
rbo
n d
rop
out to
the s
ea s
urfa
ce c
an o
ccasio
na
lly o
ccur,
or fro
m d
isch
arg
es s
uch a
s o
il sp
ills.
Bird
s a
re vu
lnera
ble
to
o
ily su
rface p
ollu
tion
, w
hic
h ca
n ca
use
d
irect
toxic
ity th
rou
gh
ing
estio
n a
nd
hyp
oth
erm
ia a
s a
result o
f the b
irds’ in
ab
ility to
wa
terp
roof th
eir fe
ath
ers
. B
irds a
re m
ost v
uln
era
ble
in th
e m
oultin
g s
easo
n w
hen
they b
eco
me
flightle
ss a
nd
sp
en
d
a la
rge
am
oun
t of tim
e o
n th
e w
ate
r su
rface. T
his
sig
nific
antly
incre
ase
s th
eir v
uln
era
bility
to
oil s
pills
.
Fulm
ars
(Fulm
aru
s g
lacia
lis), g
uille
mo
ts (U
ria a
alg
e) a
nd
puffin
s (F
rate
rcu
la a
rctic
a) a
re
partic
ula
rly v
uln
era
ble
to s
urfa
ce p
ollu
tants
as th
ey s
pen
d th
e m
ajo
rity o
f their tim
e o
n th
e
su
rface o
f the w
ate
r. He
rring
gu
ll (Laru
s a
rge
nta
tus), k
ittiwa
ke
(Ris
sa
trida
cty
la) a
nd
gre
at
bla
ck-b
acke
d g
ull (L
aru
s m
arin
us) a
re le
ss v
uln
era
ble
as th
ey s
pen
d a
larg
er p
rop
ortio
n o
f th
eir tim
e fly
ing
and
there
fore
less tim
e o
n th
e s
ea s
urfa
ce
(Sto
ne e
t al., 1
99
5). A
fter th
e
bre
ed
ing s
easo
n e
nd
s in
Ju
ne
, larg
e n
um
bers
of m
oultin
g a
uks (g
uille
mo
ts, ra
zo
rbills
(Alc
a
tord
a)
and
p
uffin
s)
dis
pe
rse
w
idely
a
wa
y fro
m th
eir
co
asta
l co
lonie
s an
d in
to offs
hore
w
ate
rs. A
t this
time
these
hig
h n
um
bers
of b
irds a
re p
artic
ula
rly v
uln
era
ble
to o
il pollu
tion
.
Se
ab
ird v
uln
era
bility
to o
il pollu
tion
is m
easu
red
usin
g th
e J
NC
C O
ffsh
ore
Vu
lnera
bility
In
de
x (O
VI). T
he O
VI fo
r se
ab
irds w
ithin
each
offs
hore
lice
nce
blo
ck c
han
ge
s th
roug
hou
t th
e y
ear. T
his
is d
ue
to s
easo
na
l fluctu
atio
ns in
the
sp
ecie
s a
nd
nu
mb
er o
f bird
s p
resen
t in
an a
rea
. T
able
3-5
d
eta
ils th
e O
VI
with
in th
e vic
inity
o
f th
e are
a.
The
o
ve
rall
se
ab
ird
vu
lnera
bility
of th
e a
rea is
hig
h.
JN
CC
has re
gis
tere
d a
‘perio
d o
f co
nce
rn’ fro
m J
uly
to S
epte
mb
er in
Blo
ck 2
0/2
and
Ju
ly
to O
cto
be
r in B
lock 2
0/3
due
to d
rilling
activ
ities (D
EC
C, 2
01
4a
).
Bla
ckb
ird a
nd E
ttrick D
eco
mm
issio
nin
g E
IA
Do
cu
me
nt N
o. E
TR
K0
00
1-G
E-O
000-L
C-R
PT
-0006
Se
pte
mb
er 2
016
P
ag
e 5
5 o
f 109
Ta
ble
3-5
: Se
ab
ird v
uln
era
bility
in v
icin
ity o
f the
Ettric
k a
nd
Bla
ckb
ird fie
lds
(JN
CC
, 19
99
).
Blo
ck
J
F
M
A
M
J
J
A
S
O
N
D
Ov
era
ll
14/2
6
4
2
3
3
4
3
1
1
1
4
3
3
2
14/2
7
4
2
3
3
4
3
1
1
1
4
3
3
2
14/2
8
4
2
3
3
4
3
1
1
1
2
3
3
2
20/1
4
2
3
3
4
2
1
1
1
4
3
3
2
20/2
4
2
3
3
4
2
1
1
1
4
3
3
2
20/3
4
2
3
3
4
2
1
1
1
1
2
3
2
20/6
4
2
3
3
2
2
1
1
1
4
2
4
2
20/7
4
2
3
3
2
2
1
1
1
4
2
4
2
20/8
4
2
3
3
1
2
1
1
1
1
2
4
1
20/9
4
2
3
3
1
3
1
1
1
1
2
4
1
Ke
y
1 =
Ve
ry H
igh
2
= H
igh
3
= M
od
era
te
4 =
Lo
w
Bla
ckb
ird a
nd E
ttrick D
eco
mm
issio
nin
g E
IA
Do
cu
me
nt N
o. E
TR
K0
00
1-G
E-O
000-L
C-R
PT
-0006
Se
pte
mb
er 2
016
P
ag
e 5
6 o
f 109
S
OC
IO-E
CO
NO
MIC
DE
SC
RIP
TIO
N
4.0
Th
e n
ee
d fo
r a
so
cio
-eco
no
mic
a
ssessm
ent
com
es d
irectly
fro
m th
e de
com
mis
sio
nin
g
oblig
atio
ns u
nd
er
the P
etro
leum
A
ct
(199
8)
wh
ich
re
qu
ire th
at
as p
art
of
the E
IA th
e
pote
ntia
l im
pact
of
deco
mm
issio
nin
g
activ
ities
on
maric
ultu
re
and
oth
er
se
a
use
rs
is
assesse
d in
ad
ditio
n to
the e
nviro
nm
enta
l imp
acts
.
Th
is s
ectio
n d
escrib
es th
e b
ase
line s
ocio
-econ
om
ic e
nviro
nm
ent a
t the d
eve
lopm
ent in
o
rde
r to a
llow
the a
ssessm
ent o
f any p
ote
ntia
l so
cie
tal im
pacts
of th
e d
ecom
mis
sio
nin
g
pro
gra
mm
e.
4.1
.1
Sh
ipp
ing
Th
e N
orth
Se
a c
onta
ins s
om
e o
f the b
usie
st s
hip
pin
g ro
ute
s in
the w
orld
, with
sig
nific
ant
traffic
ge
nera
ted b
y v
essels
tradin
g b
etw
een
ports
at e
ither s
ide o
f the N
orth
Se
a a
nd
the
Ba
ltic. W
hils
t the b
usie
st s
hip
pin
g la
ne
s in
the N
orth
Se
a a
re lo
cate
d in
the
SN
S, th
e C
NS
h
as re
lativ
ely
mo
de
rate
traffic
with
an a
ve
rag
e o
f 1 to
10 v
essels
passin
g th
roug
h e
ach
route
per d
ay (D
TI, 2
00
1).
Sh
ippin
g a
ctiv
ities in
the
No
rth S
ea a
re c
ate
goris
ed b
y O
GA
(2016
) to h
ave e
ither: v
ery
lo
w;
low
; m
ode
rate
; h
igh;
or
ve
ry
hig
h
sh
ipp
ing
d
en
sity
. F
igure
4-1
p
rovid
es
an
assessm
ent o
f the le
ve
l of s
hip
pin
g a
ctiv
ity w
ithin
the a
rea
of th
e E
&B
field
s w
hic
h is
co
nsid
ere
d m
ode
rate
.
Fig
ure
4-1
: Sh
ipp
ing
de
ns
ity in
the
vic
inity
of th
e E
ttrick
an
d B
lack
bird
field
s (D
EC
C, 2
01
4b
).
Bla
ckb
ird a
nd E
ttrick D
eco
mm
issio
nin
g E
IA
Do
cu
me
nt N
o. E
TR
K0
00
1-G
E-O
000-L
C-R
PT
-0006
Se
pte
mb
er 2
016
P
ag
e 5
7 o
f 109
4.1
.2
Co
mm
erc
ial F
ish
ing
Th
e N
orth
Se
a s
upp
orts
div
ers
e c
om
me
rcia
l fish
erie
s. In
term
s o
f marin
e e
cosyste
ms,
Inte
rnatio
na
l C
oun
cil
for
the
Exp
lora
tion
of
the
Se
a
(ICE
S)
is
the
prim
ary
so
urc
e
of
scie
ntific
advic
e to
go
ve
rnm
ents
and
inte
rnatio
na
l reg
ula
tory
bod
ies th
at m
ana
ge
the N
orth
A
tlantic
O
ce
an
a
nd
a
dja
cen
t se
as.
For
ma
nag
em
ent
purp
ose
s IC
ES
co
llate
s fis
herie
s
info
rmatio
n fo
r are
a u
nits
term
ed IC
ES
recta
ng
les m
easu
ring
30 n
m b
y 3
0 n
m. E
ach IC
ES
re
cta
ng
le co
ve
rs
app
roxim
ate
ly o
ne
h
alf
of
one
q
uad
rant
i.e.
15 lic
ence
b
locks.
Th
e
imp
orta
nce
of a
n a
rea
to th
e fis
hin
g in
du
stry
is a
ssesse
d b
y m
easu
ring
the fis
hin
g e
ffort
wh
ich
ma
y b
e d
efin
ed
as th
e n
um
ber o
f days (tim
e) x
fleet c
apa
city
(tonn
ag
e a
nd
eng
ine
pow
er). D
ue to
the re
qu
irem
ent b
y U
K fis
herm
en to
repo
rt catc
h in
form
atio
n s
uch a
s to
tal
land
ing
s (in
clu
de
s s
pecie
s ty
pe a
nd
tonn
ag
e o
f each
), and lo
catio
n o
f hau
ls a
nd
ca
tch
me
tho
d (ty
pe o
f ge
ar/d
ura
tion
of fis
hin
g), it is
possib
le to
get a
n in
dic
atio
n o
f the v
alu
e o
f a
n a
rea
(IC
ES
re
cta
ng
le)
to th
e U
K fis
hin
g in
du
stry
. It
sh
ou
ld b
e n
ote
d h
ow
eve
r, th
at
fish
ing
activ
ity
ma
y
not
be
unifo
rmly
d
istrib
ute
d
ove
r th
e
wh
ole
a
rea
of
the
ICE
S
recta
ng
les.
Ad
ditio
na
lly,
the
ICE
S
data
u
sed
is
b
ase
d
on
va
lues
repo
rted
for
ICE
S
recta
ng
les in
wh
ich
mo
re th
an
five
UK
ve
ssels
(me
asurin
g o
ve
r 10 m
) we
re a
ctiv
e. In
th
ose
IC
ES
re
cta
ng
les
wh
ere
le
ss
than
five
ve
ssels
w
ere
a
ctiv
e
the
info
rma
tion
is
co
nsid
ere
d to
be d
isclo
siv
e a
nd
is th
ere
fore
not a
va
ilable
.
Th
e E
&B
field
s lie
with
in IC
ES
recta
ng
le 4
4E
9. F
ish
ing
effo
rt by U
K v
essels
(num
ber o
f ve
ssel d
ays) w
ithin
the a
rea is
co
nsid
ere
d to
be re
lativ
ely
low
as in
dic
ate
d b
y th
e re
po
rted
land
ing
s d
ata
pro
vid
ed
in T
able
4-1
(Scottis
h G
ove
rnm
ent, 2
01
6) a
nd
illustra
ted in
Fig
ure
4-2
.
Ta
ble
4-1
: Fis
hin
g e
ffort (d
ays
by U
K fis
hin
g fle
et in
ICE
S re
cta
ng
les
44
E9
an
d 4
5E
9) (S
co
ttish
G
ove
rnm
en
t, 20
16
a).
Effo
rt (da
ys
) an
d th
e c
orre
sp
on
din
g p
erc
en
tag
e o
f UK
to
tal re
po
rted
catc
h (%
)
Ye
ar
UK
tota
l 4
4E
9
2011
1
88
,389
1
,19
8 d
ays
0.6
4 %
2012
1
85
,182
570 d
ays
0.3
1 %
2013
1
83
,413
115 d
ays
0.0
6 %
2014
1
29
,850
1
,22
7 d
ays
0.9
4 %
201
5*
124
,842
1
,10
7 d
ays
0.8
9 %
Av
era
ge
201
1 - 2
01
5
162
,335
1
,04
5 d
ays
0.6
4 %
* Pro
vis
ion
al d
ata
. Sco
ttish
Go
ve
rnm
ent, 2
016
.
Bla
ckb
ird a
nd E
ttrick D
eco
mm
issio
nin
g E
IA
Do
cu
me
nt N
o. E
TR
K0
00
1-G
E-O
000-L
C-R
PT
-0006
Se
pte
mb
er 2
016
P
ag
e 5
8 o
f 109
Fig
ure
4-2
: Fis
hin
g e
ffort (d
ays
) in th
e E
ttrick
& B
lac
kb
ird a
rea
(Sc
ottis
h G
ove
rnm
en
t, 20
16
).
Fig
ure
4-3
and T
able
4-2
sh
ow
the v
alu
e o
f land
ing
s o
f diffe
rent fis
h ty
pes (d
em
ers
al,
pela
gic
or s
hellfis
h) fro
m IC
ES
recta
ng
le 4
4E
9. L
and
ing
s d
ata
from
betw
een
201
1 to
201
5
indic
ate
th
at
it is
d
em
ers
al
sp
ecie
s
that
are
p
rima
rily
targ
ete
d
with
a
to
tal
va
lue
of
£2,6
58,4
60 la
nd
ed
fro
m re
cta
ng
le 4
4E
9 in
2
01
5 (S
co
ttish
G
ove
rnm
ent,
201
6).
Th
ese
land
ing
s e
qu
ate
to a
ppro
xim
ate
ly 1
.3%
of th
e to
tal re
po
rted la
nd
ing
s o
f dem
ers
al s
pecie
s
typ
es a
t UK
ports
in 2
01
5, s
ugg
estin
g th
e a
rea is
of re
lativ
ely
low
imp
orta
nce
to th
e U
K
dem
ers
al
fish
ing
in
du
stry
. O
f th
e £
2,6
58
,46
0 of
dem
ers
al
fish
ca
ug
ht
in 2
01
5 (w
ithin
4
4E
9), £
1,3
77,4
16
wa
s h
add
ock, £
473
,31
9 m
onkfis
h, £
27
3,5
69
wh
iting
and
£1
39,1
91 c
od.
Bla
ckb
ird a
nd E
ttrick D
eco
mm
issio
nin
g E
IA
Do
cu
me
nt N
o. E
TR
K0
00
1-G
E-O
000-L
C-R
PT
-0006
Se
pte
mb
er 2
016
P
ag
e 5
9 o
f 109
Fig
ure
4-3
: Va
lue
of fis
h la
nd
ing
s (£
) by s
pe
cie
s ty
pe
(Sc
ottis
h G
ove
rnm
en
t, 201
6).
Ta
ble
4-2
: Re
lativ
e v
alu
e o
f lan
din
gs fro
m IC
ES
rec
tan
gle
44
E9
to to
tal U
K c
atc
he
s in
20
15
*
Ye
ar
Va
lue
s o
f fish
erie
s la
nd
ing
s a
s a
% o
f UK
tota
l lan
din
gs
De
me
rsal
Pe
lag
ic
Sh
ellfis
h
To
tal
2011
£2,6
58,4
60
£19
,630
£1,6
24,6
54
£ 4
,30
2,7
44
UK
an
nu
al to
tal
£20
5,1
26
,33
9
£17
3,2
99
,52
7
£19
5,4
93
,09
9
£ 5
73
,91
8,9
65
44E
9
land
ing
s
as
a %
of U
K to
tal
1.3
0.1
1
0.8
3
0.7
5
So
urc
e: *P
rovis
ion
al d
ata
. Sco
ttish
Go
ve
rnm
ent, 2
01
6.
Th
e d
ata
p
rese
nte
d a
bo
ve
co
rrespo
nd
s w
ith th
at
reporte
d fro
m th
e V
essel
Mo
nito
ring
S
yste
ms (V
MS
s) o
n b
oa
rd th
e la
rge
r UK
ve
ssels
. UK
ve
ssels
≥1
5 m
in le
ngth
have
VM
S
on b
oa
rd th
at a
llow
en
viro
nm
enta
l and
fish
erie
s re
gu
lato
ry o
rga
nis
atio
ns to
mo
nito
r the
positio
n, tim
e a
t a p
ositio
n, c
ours
e a
nd
sp
eed
of fis
hin
g v
essels
. VM
S d
ata
for a
ll UK
re
gis
tere
d c
om
me
rcia
l fish
ing
ve
ssels
≥1
5 m
leng
th fo
r the p
erio
d 2
00
7-2
01
3 h
ave
bee
n
co
mb
ined
with
land
ing
s in
form
atio
n to
deve
lop G
IS la
ye
rs d
escrib
ing
the
sp
atia
l patte
rns
Bla
ckb
ird a
nd E
ttrick D
eco
mm
issio
nin
g E
IA
Do
cu
me
nt N
o. E
TR
K0
00
1-G
E-O
000-L
C-R
PT
-0006
Se
pte
mb
er 2
016
P
ag
e 6
0 o
f 109
of la
nd
ing
s o
f the S
co
ttish
offs
hore
fleet fro
m w
ithin
the S
co
ttish
zo
ne
of th
e U
K F
ish
ing
limits
(200 n
m) (K
afa
s e
t al., 2
01
2).
Fig
ure
4-4
sh
ow
s th
e fis
hin
g in
ten
sity
by th
e m
onito
red
fish
ing
ve
ssels
. Th
e d
ata
sh
ow
s
that fis
hin
g in
tensity
with
in th
e E
ttrick a
nd
Bla
ckbird
are
a is
hig
hest fo
r dem
ers
al (m
obile
) g
ear. N
eph
rops fis
hin
g is
mo
st in
tense
to th
e n
orth
we
st o
f Ettric
k o
n th
e F
lade
n G
roun
ds
wh
ile h
errin
g fis
hin
g w
ith p
ela
gic
ge
ar is
of lo
we
r inte
nsity
acro
ss th
e fie
lds.
F
igu
re 4
-4: V
MS
da
ta c
om
bin
ed
from
20
09 - 2
01
3 s
ho
win
g th
e fis
hin
g in
ten
sity
by fis
hin
g v
es
se
ls >
15
m
in le
ng
th in
the
No
rth S
ea
us
ing
de
me
rsa
l mo
bile
ge
ars
, Ne
ph
rop
s m
ob
ile g
ea
rs a
nd
pe
lag
ic h
errin
g
ge
ars
(Ka
fas
et a
l, 20
12
).
4.1
.3
Oth
er O
il & G
as D
eve
lop
me
nts
Blo
cks 2
0/2
and
20/3
are
locate
d w
ithin
a w
ell-d
eve
lope
d o
il and
ga
s re
gio
n.
Th
e n
eare
st s
urfa
ce in
sta
llatio
ns a
re th
e G
old
ene
ye
, the G
old
en
Eag
le a
nd th
e B
uzza
rd
Pla
tform
s lo
cate
d c
.15 k
m, 1
6 k
m a
nd 2
5 k
m re
sp
ectiv
ely
from
Ettric
k.
Bla
ckb
ird a
nd E
ttrick D
eco
mm
issio
nin
g E
IA
Do
cu
me
nt N
o. E
TR
K0
00
1-G
E-O
000-L
C-R
PT
-0006
Se
pte
mb
er 2
016
P
ag
e 6
1 o
f 109
F
igu
re 4
-5: L
oc
atio
n o
f oil a
nd
ga
s in
fras
tructu
re in
the
vic
inity
of th
e E
ttrick
an
d B
lac
kb
ird fie
lds.
4.1
.4
Milita
ry E
xerc
ise A
rea
s
No
milita
ry a
ctiv
ities a
re k
now
n to
be u
nd
erta
ken
with
in B
locks 2
0/2
and
20/3
(D
EC
C,
2014a).
4.1
.5
Oth
er P
ote
ntia
l Us
ers
Th
ere
is n
o to
uris
m, re
new
ab
le e
ne
rgy o
r ag
gre
gate
ind
ustrie
s a
sso
cia
ted w
ith th
e a
rea.
Th
e c
losest w
indfa
rm d
eve
lopm
en
t to th
e E
&B
de
ve
lopm
ents
is th
e M
ora
y F
irth W
indfa
rm
wh
ich
is lo
ca
ted
c.1
05 k
m n
orth
we
st o
f the b
locks.
Bla
ckb
ird a
nd E
ttrick D
eco
mm
issio
nin
g E
IA
Do
cu
me
nt N
o. E
TR
K0
00
1-G
E-O
000-L
C-R
PT
-0006
Se
pte
mb
er 2
016
P
ag
e 6
2 o
f 109
TH
E E
NV
IRO
NM
EN
TA
L IM
PA
CT
AS
SE
SS
ME
NT
PR
OC
ES
S
5.0
Th
is ch
ap
ter
describ
es th
e E
IA p
roce
ss a
pp
lied
to
e
ach
of
the fie
ld D
ecom
mis
sio
nin
g
Pro
ject a
ctiv
ities in
ord
er to
dete
rmin
e th
eir s
ignific
ance
.
5.1
O
verv
iew
The
EIA
pro
cess id
en
tifies th
e p
ote
ntia
l enviro
nm
enta
l effe
cts
of a
pro
po
sed
deve
lopm
ent
and
aim
s to
pre
ve
nt, re
du
ce a
nd
offs
et a
ny a
dve
rse
imp
acts
iden
tified. T
he
req
uire
me
nts
fo
r an E
IA a
re d
efin
ed
by th
e C
oun
cil D
irectiv
e 8
5/3
37/E
EC
as a
me
nde
d b
y D
irectiv
es
97/1
1/E
C a
nd 2
00
3/3
5/E
C.
For th
e E
IA p
roce
ss, a
ctiv
ities lik
ely
to h
ave
an im
pact o
n th
e e
nviro
nm
en
t and
pote
ntia
l cu
mu
lativ
e a
nd
transb
ou
nd
ary
imp
acts
are
first id
en
tified. O
nce
iden
tified, th
ese
activ
ities
are
assesse
d to
defin
e th
e le
ve
l of p
ote
ntia
l risk th
ey p
rese
nt to
the e
nviro
nm
ent s
o th
at,
wh
ere
ne
ce
ssary
, su
ch ris
ks c
an b
e re
mo
ve
d o
r redu
ced
thro
ug
h d
esig
n o
r the a
do
ptio
n o
f o
pe
ratio
na
l me
asu
res (m
itiga
tion
).
5.2
T
he E
IA M
eth
od
olo
gy
Ce
ntra
l to th
e E
IA p
rocess is
the re
qu
irem
ent to
iden
tify a
ctiv
ities th
at c
ould
ca
use
harm
to
the e
nviro
nm
ent o
r oth
er u
sers
of th
at e
nviro
nm
ent. O
nce id
en
tified, th
ese
activ
ities a
re
assesse
d to
defin
e th
eir le
ve
l, i.e. th
e s
ign
ifica
nce
of p
ote
ntia
l imp
act th
at th
ey p
rese
nt, s
o
that
me
asure
s ca
n b
e ta
ke
n to
rem
ove
or
redu
ce n
eg
ativ
e im
pacts
th
roug
h d
esig
n o
r o
pe
ratio
na
l me
asu
res (m
itiga
tion
).
Th
is E
IA is
base
d o
n th
e o
utc
om
es o
f an E
NV
ID w
ork
sh
op
und
erta
ke
n o
n T
uesd
ay 1
0th
Ju
ne
, 2
01
4.
Th
e
EN
VID
is
a
h
igh
le
ve
l to
ol
used
to
fa
cilita
te
iden
tifica
tion
of
the
enviro
nm
enta
l a
nd
so
cia
l im
pacts
a
ssocia
ted
with
th
e
pro
ject.
The
E
NV
ID
is
an
a
pp
rop
riate
basis
for a
n E
IA a
t this
sta
ge
as it ta
ke
s a
hig
h-le
ve
l app
roa
ch
, partic
ula
rly
wh
ere
sp
ecific
deta
ils o
f ope
ratio
ns a
re n
ot y
et k
no
wn
. Full d
eta
ils o
f the E
NV
ID, in
clu
din
g
results
ca
n b
e fo
un
d in
the E
NV
ID re
port (N
exe
n, 2
01
4a).
Th
e
sig
nific
ance
of
any
pote
ntia
l im
pact
is
dete
rmin
ed
th
roug
h
the
use
of
a
risk
assessm
ent a
ppro
ach w
hic
h e
mp
loys th
e s
tand
ard
risk a
ssessm
ent p
hilo
sop
hy o
f:
Lik
elih
oo
d o
f occurre
nce
(frequ
en
cy/p
rob
ab
ility) x
ma
gn
itude
of im
pact (c
onse
qu
en
ce) =
R
isk
Th
e s
ign
ifica
nce
of p
ote
ntia
l risk is
assesse
d a
ga
inst fo
ur d
rive
rs:
i. H
arm
to P
eop
le
ii. E
nviro
nm
ent E
ffects
iii. F
inan
cia
l Imp
act
iv.
Imp
act o
n R
epu
tatio
n
For e
ve
ry is
su
e o
r aspe
ct id
en
tified fo
r the p
roje
ct, th
e p
ote
ntia
l risk w
as e
va
luate
d b
y
co
mb
inin
g th
e lik
elih
oo
d o
f occurre
nce
(freq
uen
cy / p
rob
ability
) (rate
d A
to E
as d
efin
ed
in
Ta
ble
5-1
), with
the m
ag
nitu
de
of th
e c
onseq
uence
s fo
r each
of th
e fo
ur d
rive
rs in
dic
ate
d
abo
ve. T
he h
igh
est c
onse
qu
en
ce ra
ting
sco
re in
any o
f the d
rive
r ca
teg
orie
s w
as u
sed
(ra
ted m
inor to
cata
stro
ph
ic a
s d
efin
ed
in T
able
5-1
). Bo
th c
om
pon
ents
are
, at b
est, s
em
i-q
uantita
tive
a
nd
re
pre
se
nt
best
judg
em
ent
on
the
basis
of
ava
ilable
kn
ow
ledg
e
and
e
xp
erie
nce
, but p
rovid
e a
co
nsis
tent a
nd d
ocum
en
ted
appro
ach
acro
ss th
e w
hole
pro
ject.
Bla
ckb
ird a
nd E
ttrick D
eco
mm
issio
nin
g E
IA
Do
cu
me
nt N
o. E
TR
K0
00
1-G
E-O
000-L
C-R
PT
-0006
Se
pte
mb
er 2
016
P
ag
e 6
3 o
f 109
Th
e o
ve
rall s
ign
ifica
nce o
f any p
ote
ntia
l risk w
as th
en d
ete
rmin
ed fro
m th
e ris
k m
atrix
(T
ab
le 5
-1). D
efin
itions o
f ove
rall s
ign
ifica
nce
are
pro
vid
ed
in T
able
5-2
.
On
ce o
ve
rall
imp
act
sig
nific
ance
h
as b
ee
n a
sse
ssed
, a
pp
ropria
te m
itigatio
n m
easu
res
sh
ou
ld b
e a
pp
lied to
each
are
a o
f imp
act w
ith th
e a
im o
f redu
cin
g th
e le
ve
l of s
ign
ifica
nce.
On
ce m
itiga
tion
me
asu
res h
ave
b
ee
n a
pp
lied,
issu
es a
re re
assesse
d to
se
e if
ove
rall
imp
act s
ign
ifica
nce
ha
s b
ee
n re
du
ced.
Th
e o
utc
om
es fo
r each o
f the p
ote
ntia
l issu
es id
en
tified a
re p
resente
d in
the E
IA m
atrix
(S
ectio
n 5
.3).
Blackbird and Ettrick Decommissioning EIA
Document No. ETRK0001-GE-O000-LC-RPT-0006
September 2016 Page 64 of 109
Table 5-1 Nexen's Corporate Assessment Matrix.
Bla
ckb
ird a
nd E
ttrick D
eco
mm
issio
nin
g E
IA
Do
cu
me
nt N
o. E
TR
K0
00
1-G
E-O
000-L
C-R
PT
-0006
No
ve
mb
er 2
016
P
ag
e 6
5 o
f 109
Ta
ble
5-2
Ac
ce
pta
nc
e c
riterio
n
Ris
k
Ac
cep
tan
ce C
riterio
n
HIG
H
Th
e ris
k is
una
cce
pta
ble
. A H
igh H
SE
Ris
k a
ctiv
ity c
an
no
t go
ah
ea
d; fu
rthe
r co
ntro
ls
must b
e p
ut in
pla
ce
to re
du
ce
the
risk to
Med
ium
or lo
we
r.
No
n-H
SE
H
igh R
isk a
ctiv
ities re
qu
ire th
e a
ppro
pria
te sta
ke
ho
lders
to
re
vie
w a
nd
a
gre
e to
acce
pt th
e re
sid
ua
l risk le
ve
l. Th
is m
ust b
e a
pp
rove
d b
y th
e a
pp
rop
riate
leve
l o
f ma
na
ge
me
nt (e
.g. V
P O
pera
tions).
ME
DIU
M
Th
e ris
k is
to
lera
ble
if
it h
as b
ee
n re
du
ce
d to
A
LA
RP
(A
s L
ow
A
s R
easo
na
bly
P
ractic
ab
le):
A M
ed
ium
R
isk a
ctiv
ity m
ay g
o a
he
ad
p
rovid
ed th
at
all
reaso
na
bly
p
ractic
ab
le c
on
trols
ha
ve
be
en
ide
ntifie
d a
nd p
ut in
pla
ce
.
LO
W
Th
e ris
k is
bro
ad
ly a
cce
pta
ble
if it is m
an
ag
ed
, wh
ich
me
an
s th
at a
Lo
w R
isk a
ctiv
ity
ma
y go a
he
ad
, but c
on
sid
era
tion
sh
ou
ld b
e g
ive
n to
me
an
s fo
r furth
er re
du
cin
g th
e
risk.
5.3
A
ss
es
sm
en
t of P
ote
ntia
l Imp
acts
an
d C
on
trol M
easu
res
Usin
g th
e in
form
atio
n p
rovid
ed
in S
ectio
ns 2
, 3 a
nd 4
and
the c
riteria
se
t out in
Se
ctio
n 5
, an
EN
VID
Work
sh
op
wa
s h
eld
to id
en
tify th
e e
nviro
nm
enta
l aspe
cts
and
asse
ss th
eir p
ote
ntia
l e
nviro
nm
enta
l imp
act a
nd
risk. T
he re
sults
of th
e E
NV
ID a
re p
resente
d in
Ap
pe
nd
ix A
.
Th
e e
nviro
nm
enta
l aspects
wh
ich
we
re e
ither: s
ub
ject to
reg
ula
tory
co
ntro
l; or w
ere
foun
d to
p
ose
a m
ode
rate
or h
igh ris
k to
the e
nviro
nm
ent; o
r we
re re
cog
nis
ed d
urin
g th
e c
onsu
ltatio
n
pha
se a
s a
reas o
f pub
lic c
once
rn, w
ere
furth
er a
sse
ssed
and a
re d
escrib
ed
in S
ectio
n 6
.
Bla
ckb
ird a
nd E
ttrick D
eco
mm
issio
nin
g E
IA
Do
cu
me
nt N
o. E
TR
K0
00
1-G
E-O
000-L
C-R
PT
-0006
No
ve
mb
er 2
016
P
ag
e 6
6 o
f 109
FU
RT
HE
R
AS
SE
SS
ME
NT
O
F
PO
TE
NT
IAL
6
.0E
NV
IRO
NM
EN
TA
L IM
PA
CT
S
Fro
m
the
EN
VID
(s
ee
Ap
pe
nd
ix
A)
it w
as
foun
d
that
non
e
of
the
pla
nn
ed
a
ctiv
ities
associa
ted
with
the d
eco
mm
issio
nin
g, P
&A
and
su
bse
qu
ent e
nviro
nm
enta
l su
rve
ys a
re lik
ely
to
h
ave
a
sig
nific
ant
enviro
nm
enta
l im
pact.
Ho
we
ve
r, d
ue
to
so
me
a
sp
ects
b
ein
g u
nd
er
reg
ula
tory
co
ntro
l and
/or o
f pub
lic in
tere
st, th
is s
ectio
n fu
rther d
escrib
es th
e im
pacts
. Th
e
aspe
cts
co
nsid
ere
d in
clu
de
:
· E
nerg
y u
se a
nd
em
issio
ns to
air;
· D
isch
arg
es to
se
a;
· S
olid
de
posits
on th
e s
ea
be
d a
nd
dis
turb
an
ce to
se
ab
ed
· U
nde
rwa
ter n
ois
e;
· W
aste
Ma
na
ge
me
nt a
nd R
esou
rce U
se
: and
· A
ccid
en
tal E
ve
nts
.
6.1
E
nerg
y U
se a
nd
Atm
osp
he
ric E
mis
sio
ns
Th
is
sectio
n
pro
vid
es
an
assessm
ent
of
the
estim
ate
d
energ
y
use
and
a
tmo
sph
eric
e
mis
sio
ns p
rod
uce
d a
s a
result
of
the p
rop
osed
deco
mm
issio
nin
g a
ctiv
ities.
Co
ntro
l a
nd
mitig
atio
n m
easu
res in
ten
de
d to
achie
ve
optim
um
ene
rgy e
fficie
ncy a
nd
redu
ce e
mis
sio
ns
are
als
o c
onsid
ere
d.
Th
e
En
erg
y
Institu
te
(form
erly
th
e
Institu
te
of
Pe
trole
um
) pro
du
ced
G
uid
elin
es
for
the
Ca
lcu
latio
n o
f Estim
ate
s o
f En
erg
y U
se
and
Ga
seo
us E
mis
sio
ns in
the D
ecom
mis
sio
nin
g o
f O
ffsh
ore
Stru
ctu
res (Io
P, 2
00
0). T
he a
pp
roa
ch
se
t out h
as b
ee
n u
se
d a
s th
e b
asis
for th
e
ene
rgy b
ala
nce
asse
ssm
ent c
arrie
d o
ut h
ere
. Th
e m
ain
ste
ps o
f the a
ssessm
ent in
clu
de
d:
· E
sta
blis
hm
en
t of a
mate
rials
inve
nto
ry fo
r each s
tructu
re to
be d
eco
mm
issio
ne
d;
· Id
en
tificatio
n o
f all o
pe
ratio
ns a
ssocia
ted w
ith d
eco
mm
issio
nin
g;
· Id
en
tificatio
n
of
all
end
p
oin
ts
associa
ted
w
ith
deco
mm
issio
nin
g
each
stru
ctu
re,
wh
ere
end
po
ints
are
defin
ed
as th
e fin
al s
tate
s o
f the m
ate
rials
at th
e c
essatio
n o
f th
e d
eco
mm
issio
nin
g o
pe
ratio
ns, in
clu
din
g th
e p
resen
ce o
f ma
teria
l in la
ndfill s
ites o
r o
n th
e s
eab
ed
.
· F
or e
ach
opera
tion
and e
nd
poin
t, identific
atio
n o
f the a
ssocia
ted a
ctiv
ities th
at w
ill b
e a
so
urc
e o
f ene
rgy u
se
an
d a
tmo
sph
eric
em
issio
ns; a
nd
· S
ele
ctio
n
of
co
nve
rsio
n
facto
rs
and
ca
lcu
latio
n
of
energ
y
use
and
a
tmo
sph
eric
e
mis
sio
ns.
6.1
.1
Ac
tivitie
s (C
au
se o
f Imp
ac
t)
Activ
ities c
on
sid
ere
d lik
ely
to c
on
sum
e e
nerg
y a
nd
lea
d to
em
issio
ns to
atm
osph
ere
inclu
de
:
· O
ffsh
ore
ope
ratio
ns;
· R
ecyclin
g a
nd
recove
ry o
f ma
teria
ls; a
nd
· M
anu
factu
re o
f ma
teria
ls to
repla
ce th
ose d
ecom
mis
sio
ne
d in
-situ
.
Bla
ckb
ird a
nd E
ttrick D
eco
mm
issio
nin
g E
IA
Do
cu
me
nt N
o. E
TR
K0
00
1-G
E-O
000-L
C-R
PT
-0006
No
ve
mb
er 2
016
P
ag
e 6
7 o
f 109
It sh
ou
ld b
e n
ote
d th
at o
nsho
re tra
nsp
orta
tion
of re
cove
red
ma
teria
ls is
no
t exp
ecte
d to
be
ca
rried o
ut a
t a s
ca
le th
at w
ould
lead
to s
ign
ifican
t add
itiona
l em
issio
ns w
hen
co
nsid
ere
d in
th
e
wid
er
co
nte
xt
of
gen
era
l o
nsh
ore
tra
nsp
orta
tion
activ
ities.
Th
ey
are
th
ere
fore
n
ot
co
nsid
ere
d fu
rther h
ere
.
Th
e p
rincip
al e
mis
sio
ns lo
cal to
the E
&B
de
ve
lop
me
nts
will b
e th
e re
lease
s o
f co
mb
ustio
n
ga
ses fro
m th
e d
rilling
rig a
nd
ve
ssel a
nd e
ng
ine
s. T
he d
rilling
rig a
nd
ve
sse
l req
uire
me
nts
a
nd
antic
ipate
d fu
el u
se fo
r the p
rop
osed
activ
ities a
re p
rese
nte
d in
Ta
ble
2-5
wh
ilst T
able
6-1
pre
sen
ts th
e a
ntic
ipate
d e
mis
sio
ns a
ssocia
ted
with
this
tota
l fuel u
se.
Ta
ble
6-1
: En
erg
y u
se
an
d e
mis
sio
ns
as
so
cia
ted
with
ve
ss
els
(inc
lud
ing
the
drillin
g rig
)
So
urc
e
Fu
el
Us
e (te
)
En
erg
y
Us
e
(GJ
)
Em
iss
ion
s fro
m fu
el u
se
(te)
CO
2 N
Ox
N2 O
S
O2
CO
C
H4
VO
C
To
tal v
essels
(in
clu
din
g d
rilling
rig
) 1
6,4
93
71
0,8
27
52
,776
98
0
4
33
25
9
3
33
UK
Sh
ipp
ing
e
mis
sio
ns 2
01
4
(CC
C, 2
01
6)
9,9
00
,00
0
To
tal v
essel
em
issio
ns a
s a
%
of 2
014
UK
sh
ipp
ing
e
mis
sio
ns
0.5
3
Th
e to
tal a
ntic
ipate
d a
nn
ua
l CO
2 em
issio
ns a
ssocia
ted
with
the v
essels
co
mp
rise
aro
un
d
0.5
3 %
of to
tal e
mis
sio
ns fro
m s
hip
pin
g th
e U
KC
S in
201
4 (C
CC
, 201
6), h
ow
eve
r as th
e
deco
mm
issio
nin
g a
nd
P
&A
a
ctiv
ities w
ill b
e sp
read
o
ve
r a
n
um
ber
of
ye
ars
th
e a
nn
ua
l co
ntrib
utio
n in
an
y o
ne
ye
ar w
ill be s
ign
ifica
ntly
less.
R
ec
yc
ling
, Re
co
ve
r an
d M
an
ufa
ctu
re o
f Ma
teria
ls
6.1
.1.1
Re
cyclin
g a
nd
recove
ry o
f ma
teria
ls fro
m th
e s
tructu
res to
be re
cove
red to
sh
ore
will h
ave
a
n e
ne
rgy d
em
and
and a
ssocia
ted
em
issio
ns. T
he
se w
ill prim
arily
be a
ssocia
ted
with
the
reco
ve
ry o
f th
e ste
el.
Whils
t le
avin
g m
ate
rials
in
situ
h
as n
o e
ne
rgy u
se o
r a
ssocia
ted
em
issio
ns
to
atm
osph
ere
, th
e
ene
rgy
use
and
e
mis
sio
ns
used
to
re
pla
ce
those
“lo
st”
ma
teria
ls
ca
n
be
ca
lcu
late
d
usin
g
the
Institu
te
of
Petro
leum
(Io
P)
gu
idelin
es.
The
co
nsid
era
tion
of th
ese
allo
ws th
e e
ne
rgy u
se a
nd
em
issio
ns fro
m th
e o
ther a
ctiv
ities to
be
p
ut in
to c
onte
xt.
Th
e estim
ate
d em
issio
ns a
ssocia
ted w
ith th
e re
cyclin
g of
the E
&B
in
frastru
ctu
re to
b
e
recove
red
, as w
ell a
s th
ose
associa
ted
with
pro
ducin
g e
qu
iva
lent v
olu
me
s o
f ste
el th
at w
ill b
e d
eco
mm
issio
ne
d in
situ
have
be
en c
alc
ula
ted
usin
g th
e Io
P G
uid
elin
es (Io
P, 2
00
0) (T
able
6-2
). It
is
antic
ipate
d
that
recyclin
g
of
recovere
d
me
tals
oth
er
than
ste
el
will
not
be
und
erta
ke
n o
n a
sca
le th
at
will
lead
to
sig
nific
ant
add
itiona
l e
mis
sio
ns,
so
th
ey a
re n
ot
co
nsid
ere
d fu
rther. R
ecove
red
co
ncre
te (e
.g. fro
m m
attre
sse
s) m
ay b
e c
rushe
d fo
r reu
se, a
n
activ
ity co
nsid
ere
d to
ha
ve
a
re
lativ
ely
lo
w e
ne
rgy d
em
and
a
nd
th
ere
fore
are
a
lso
n
ot
co
nsid
ere
d fu
rther.
Bla
ckb
ird a
nd E
ttrick D
eco
mm
issio
nin
g E
IA
Do
cu
me
nt N
o. E
TR
K0
00
1-G
E-O
000-L
C-R
PT
-0006
No
ve
mb
er 2
016
P
ag
e 6
8 o
f 109
Ta
ble
6-2
: En
erg
y u
se
an
d e
mis
sio
ns
from
rec
yc
ling
an
d re
pla
cem
en
t of s
tee
l
Infra
stru
ctu
re
Ste
el (te
) C
O2 (te
) E
ne
rgy U
se
(GJ
)
Em
issio
ns a
sso
cia
ted
with
recyclin
g o
f reco
ve
red s
tee
l
Ettric
k in
sta
llatio
ns
4,0
19
3,9
45
36
,981
Ettric
k p
ipe
lines
1,3
45
1,2
91
12
,105
Bla
ckb
ird in
sta
llatio
ns
30
6
29
4
2,7
54
Bla
ckb
ird p
ipe
lines
1,0
30
98
9
9,2
70
Ste
el re
cyc
ling
tota
l 6
,79
0
6,5
18
61
,110
Em
issio
ns a
sso
cia
ted
with
repla
cem
en
t of s
teel le
ft in s
itu
Ettric
k in
sta
llatio
ns
94
9
1,7
93
23
,725
Ettric
k p
ipe
lines
1,6
29
3,0
77
40
,725
Bla
ckb
ird in
sta
llatio
ns
44
83
1,1
00
Bla
ckb
ird p
ipe
lines
2,1
26
4,0
16
53
,150
Ste
el re
pla
ce
me
nt to
tal
4,7
48
8,9
69
11
8,7
00
Ove
rall s
tee
l tota
l 1
1,5
38
15
,487
17
9,8
10
6.1
.2
Imp
act o
n R
ece
pto
rs
Ap
pro
xim
ate
ly 4
3 %
o
f th
e to
tal
CO
2 e
mis
sio
ns fo
r th
e p
rop
osed
E&
A d
eco
mm
issio
nin
g
activ
ities
is
rela
ted
to
th
e
onsh
ore
re
cyclin
g
of
mate
rials
fro
m
the
se
ab
ed
a
nd
the
ma
nufa
ctu
re o
f mate
rials
to re
pla
ce th
ose
decom
mis
sio
ne
d in
situ
. Whe
n c
om
pa
red
ag
ain
st
the 1
3 m
illion to
nn
es o
f ca
rbo
n d
ioxid
e e
qu
iva
len
t (CO
2 e) e
mitte
d fro
m in
du
stry
acro
ss th
e
UK
(Sco
tlan
d, E
ng
land
, Wale
s a
nd
No
rthern
Irela
nd
) in 2
01
4 (D
EC
C, 2
01
6) th
e a
ntic
ipate
d
CO
2 em
issio
ns c
aptu
red in
Ta
ble
6-2
repre
se
nt c
. 0.1
% o
f tota
l CO
2 e in
dustry
em
issio
ns.
Th
e e
ne
rgy c
onsu
mptio
n a
ssocia
ted
with
the d
eco
mm
issio
nin
g a
ctiv
ities fo
r E&
B fie
lds is
e
xp
ecte
d
to
lead
to
the
e
mis
sio
n
of
com
bustio
n g
ases
inclu
din
g
CO
2 , m
eth
an
e (C
H4 ),
nitro
ge
n o
xid
es (N
Ox ), s
ulp
hu
r dio
xid
e (S
O2 ) a
nd V
ola
tile O
rga
nic
Com
poun
ds (V
OC
s).
Th
e d
irect im
pact o
f NO
x , SO
2 and
VO
C in
the a
tmo
sph
ere
is th
e fo
rma
tion
of p
ho
toch
em
ica
l p
ollu
tion
in th
e p
rese
nce o
f su
nlig
ht, c
om
pris
ing
ma
inly
low
leve
l ozo
ne
, but b
y-p
rod
ucts
ma
y
inclu
de
nitric
acid
, su
lphu
ric a
cid
and n
itrate
-ba
se
d p
artic
ula
te. T
he fo
rma
tion
of a
cid
and
partic
ula
tes m
ay le
ad
to a
co
ntrib
utio
n to
acid
rain
fall a
nd
the d
ry d
ep
ositio
n o
f partic
ula
tes. If
su
ch d
ep
ositio
n o
ccu
rs a
t se
a, it is
possib
le th
at th
e s
ubsta
nce
s w
ill dis
so
lve
in s
ea w
ate
r but
the le
ve
l o
f d
ep
ositio
n is
u
nlik
ely
to
le
ad
to
a
ny sig
nific
ant
imp
acts
o
n lo
cal
se
a w
ate
r co
mp
ositio
n d
ue
to th
e re
lativ
ely
sm
all
am
ou
nt
wh
en
co
mp
are
d to
e
mis
sio
ns fro
m o
ther
ve
ssels
. In
a
dd
ition,
the u
ltima
te fa
te of
atm
osp
he
ric e
mis
sio
ns ca
n ofte
n b
e d
ifficu
lt to
p
red
ict
ow
ing
to
the d
ep
en
de
nce
on va
riab
le w
eath
er
(espe
cia
lly w
ind
), o
ve
r q
uite
sh
ort
time
scale
s.
CO
2 em
issio
ns c
ontrib
ute
to g
reen
ho
use
gas e
mis
sio
ns a
nd
glo
ba
l wa
rmin
g im
pacts
. The
tota
l estim
ate
d v
essel C
O2 e
mis
sio
ns p
rod
uced
as p
art o
f the d
ecom
mis
sio
nin
g o
pe
ratio
ns
in re
latio
n to
the to
tal C
O2 p
rod
uced fro
m U
K d
om
estic
sh
ippin
g (C
CC
, 20
16
) is c
. 0.2
%. In
a
dd
ition, th
ere
will b
e a
co
ntrib
utio
n to
glo
ba
l wa
rmin
g fro
m o
ther g
aseo
us e
mis
sio
ns, th
e
ove
rall g
loba
l wa
rmin
g p
ote
ntia
l (GW
P - a
rela
tive
me
asure
of h
ow
mu
ch h
ea
t a g
ree
nho
use
Bla
ckb
ird a
nd E
ttrick D
eco
mm
issio
nin
g E
IA
Do
cu
me
nt N
o. E
TR
K0
00
1-G
E-O
000-L
C-R
PT
-0006
No
ve
mb
er 2
016
P
ag
e 6
9 o
f 109
ga
s
traps
in
the
atm
osp
he
re).
Th
e
co
ntrib
utio
n
will
be
pro
po
rtiona
l to
th
e
vo
lum
e
of
em
issio
ns,
as fo
r C
O2 .
Th
ere
fore
th
e o
ve
rall
GW
P w
ill a
lso
co
nstitu
te a
re
lativ
ely
sm
all
incre
ase
to e
xis
ting e
mis
sio
ns. T
he s
ign
ifica
nce o
f the
imp
act o
f CO
2 em
issio
ns fro
m th
e
E&
B d
eco
mm
issio
nin
g a
ctiv
ities h
as b
ee
n a
sse
sse
d a
s lo
w.
In g
enera
l, enviro
nm
enta
l co
nd
itions o
ffsh
ore
will le
ad
to ra
pid
dis
pers
ion a
nd
dilu
tion
of a
ny
em
issio
ns to
a
tmo
sph
ere
. T
he E
&B
fa
cilitie
s a
re lo
cate
d c.7
0 km
fro
m th
e n
eare
st
UK
co
astlin
e. O
ffsh
ore
we
ath
er c
ond
itions w
ill me
an
that im
pacts
will b
e lo
calis
ed a
nd
sh
ort
term
. It
is co
nsid
ere
d th
at
the e
mis
sio
ns to
a
tmo
sph
ere
fro
m th
e E
&B
d
eco
mm
issio
nin
g
activ
ities a
re u
nlik
ely
to le
ad
to a
ny s
ign
ifica
nt im
pacts
on e
ither s
ea w
ate
r qu
ality
or a
ir q
uality
and
not h
ave
a s
ign
ifica
nt c
ontrib
utio
n to
glo
ba
l wa
rmin
g. T
he s
ignific
ance
of im
pacts
o
n e
ither s
eaw
ate
r qu
ality
or a
ir qu
ality
has b
ee
n a
ssesse
d a
s lo
w.
Se
ctio
n 3
describ
es th
e b
iolo
gic
al e
nviro
nm
ent a
nd
the re
cepto
rs w
hic
h c
ould
be im
pacte
d
by a
tmo
sph
eric
em
issio
ns. W
ithin
the v
icin
ity o
f E&
B th
ere
are
recepto
rs p
resen
t thro
ug
hout
the y
ear in
clu
din
g fis
h s
paw
nin
g a
nd
nurs
ery
gro
un
ds, m
arin
e m
am
ma
ls (w
ith th
e h
igh
est
se
nsitiv
ity d
urin
g th
e s
um
mer m
onth
s) a
nd
se
abird
s (w
ith th
e h
igh
est s
en
sitiv
ity d
urin
g th
e
su
mm
er
mo
nth
s).
Alth
ou
gh
th
ere
a
re re
cep
tors
p
rese
nt
thro
ug
hou
t th
e ye
ar,
giv
en th
e
rela
tive
ly s
hort d
ura
tion
of th
e a
ctiv
ities a
nd
the ra
pid
dis
pers
ion in
the a
rea
, the s
ign
ifica
nce
of th
e im
pact o
n th
e re
cep
tors
is a
ssesse
d a
s lo
w.
6.1
.3
Tra
nsb
ou
nd
ary
an
d C
um
ula
tive
Imp
acts
Th
e
E&
B
facilitie
s
are
lo
cate
d
c.1
42
km
w
est
of
the
UK
/No
rwe
gia
n
me
dia
n
line.
Th
e
transb
ou
nd
ary
imp
act o
f atm
osph
eric
em
issio
ns a
risin
g fro
m th
e d
eco
mm
issio
nin
g a
ctiv
ities
at E
&B
are
exp
ecte
d to
be o
f low
sig
nific
ance
ow
ing
to th
e ra
pid
dis
pers
ion a
nd
dilu
tion
of
em
issio
ns w
hic
h w
ill occur in
offs
hore
we
ath
er c
on
ditio
ns a
nd
ove
r dis
tance
.
In re
latio
n to
the c
urre
nt le
ve
ls o
f sh
ippin
g tra
ffic w
hic
h a
lread
y p
ass E
&B
, the e
xp
ecte
d
em
issio
ns fro
m th
e d
ecom
mis
sio
nin
g a
ctiv
ities w
ill repre
sen
t a s
ma
ll incre
me
nta
l add
ition to
e
mis
sio
ns of
co
mb
ustio
n g
ases w
hic
h a
lread
y o
ccur
ove
r a
re
lativ
ely
sh
ort
time
p
erio
d.
Th
ere
fore
, alth
oug
h th
e e
mis
sio
ns to
air w
ill co
ntrib
ute
to g
loba
l wa
rmin
g, th
e c
um
ula
tive
im
pact
on
re
cep
tors
from
th
e a
tmo
sph
eric
e
mis
sio
ns g
ene
rate
d b
y th
e d
eco
mm
issio
nin
g
activ
ities fo
r E&
B h
ave
be
en a
ssesse
d a
s o
f low
sig
nific
ance.
6.1
.4
Co
ntro
l an
d M
itigatio
n M
eas
ure
s
In lin
e w
ith th
e N
exe
n’s
routin
e e
nviro
nm
enta
l man
ag
em
ent o
f ve
ssels
, the
follo
win
g c
ontro
l a
nd
mitig
atio
n m
easure
s h
ave
bee
n id
en
tified to
optim
ise
energ
y c
onsum
ptio
n a
nd re
du
ce
the s
ign
ifica
nce o
f the im
pacts
from
atm
osph
eric
em
issio
ns:
· P
rior
to
the
mo
bilis
atio
n,
ve
ssels
w
ill b
e
se
lecte
d
and
a
sse
ssed
to
ensu
re
ma
inte
na
nce
of g
enera
tors
and
eng
ines w
hic
h le
ad
s to
bette
r effic
iency in
line w
ith
ma
nufa
ctu
rer’s
sp
ecific
atio
ns; a
nd
· D
ecom
mis
sio
nin
g ve
ssel
sch
ed
ule
s w
ill b
e p
lan
ned
to
o
ptim
ise
(m
inim
ise
) ve
ssel
use.
6.1
.5
Co
nc
lus
ion
Th
e p
rincip
al e
ne
rgy u
se a
nd
ge
ne
ratio
n o
f em
issio
ns to
air lo
cal to
the E
&B
de
ve
lopm
ents
w
ill aris
e fro
m fu
el c
om
bu
stio
n fo
r pro
pu
lsio
n a
nd
pow
er g
ene
ratio
n b
y th
e v
essels
req
uire
d
for
the a
ctiv
ities.
Th
ese e
mis
sio
ns w
ill in
clu
de
co
mp
on
en
ts w
hic
h h
ave
th
e p
ote
ntia
l to
co
ntrib
ute
to g
loba
l wa
rmin
g, a
cid
rain
fall, d
ry d
epo
sitio
n o
f partic
ula
tes a
nd
pho
toch
em
ical
Bla
ckb
ird a
nd E
ttrick D
eco
mm
issio
nin
g E
IA
Do
cu
me
nt N
o. E
TR
K0
00
1-G
E-O
000-L
C-R
PT
-0006
No
ve
mb
er 2
016
P
ag
e 7
0 o
f 109
pollu
tion
o
r ca
use
im
pacts
o
n lo
cal
air
qu
ality
. It
is e
xp
ecte
d th
at
imp
acts
w
ill b
e
low
sig
nific
ance a
s th
ey w
ill be s
hort te
rm.
The
energ
y u
sag
e fro
m th
e d
ecom
mis
sio
nin
g o
f the E
&B
infra
stru
ctu
re is
estim
ate
d to
be
710
,82
7
GJ
dire
ct
(ve
ssel
use
a
nd
drillin
g
rig)
and
1
79,8
10
G
J
indire
ct
req
uire
me
nts
(m
anufa
ctu
re o
f new
ma
teria
ls to
repla
ce th
ose
de
co
mm
issio
ne
d in
situ
and
those
recove
red
sh
ou
ld n
on
e o
f them
be re
use
d).
Tota
l dire
ct C
O2 e
mis
sio
ns g
ene
rate
d b
y th
e p
rop
osed
deco
mm
issio
nin
g a
ctiv
ities c
om
pris
e
em
issio
ns fro
m v
essels
and
drillin
g rig
estim
ate
d to
eq
uate
to 0
.53 %
of to
tal e
mis
sio
ns fro
m
sh
ippin
g th
e U
KC
S in
201
4 (C
CC
, 201
6). H
ow
eve
r as d
iscu
ssed
the d
eco
mm
issio
nin
g a
nd
P&
A a
ctiv
ities w
ill be s
pre
ad
ove
r a n
um
ber o
f ye
ars
su
ch th
at th
e a
nn
ua
l co
ntrib
utio
n in
any
one
ye
ar
will
be sig
nific
antly
le
ss.
Em
issio
ns to
a
tmo
sph
ere
fro
m th
e d
eco
mm
issio
nin
g
activ
ities
are
u
nlik
ely
to
sig
nific
antly
co
ntrib
ute
to
g
reen
ho
use
g
as
em
issio
ns
or
glo
ba
l w
arm
ing
imp
acts
.
Sta
nd
ard
mitig
atio
n m
easu
res to
optim
ise
ene
rgy u
sag
e b
y v
essels
will in
clu
de
ope
ratio
na
l p
ractic
es
and
p
ow
er
ma
nag
em
ent
syste
ms
for
eng
ines,
ge
ne
rato
rs
and
a
ny
oth
er
co
mb
ustio
n p
lant a
nd
pla
nn
ed
pre
ve
nta
tive
ma
inte
na
nce
syste
ms fo
r all e
qu
ipm
ent fo
r peak
ope
ratio
na
l effic
iency.
6.2
D
isch
arg
es to
Sea
Th
e d
ecom
mis
sio
nin
g o
pe
ratio
ns h
ave
the p
ote
ntia
l to le
ad
to th
e d
isch
arg
e o
f liqu
ids in
to
the s
ea. W
he
ther th
ese d
isch
arg
es a
ctu
ally
occur is
influ
en
ced b
y th
e fo
llow
ing
facto
rs:
· T
he e
ffectiv
ene
ss o
f the p
rep
ara
tion a
nd
pre
-deco
mm
issio
nin
g a
ctiv
ities;
· O
pera
tiona
l pra
ctic
es a
nd
pro
ce
dure
s a
do
pte
d b
y v
essels
(both
at th
e s
urfa
ce a
nd
su
bse
a), in
clu
din
g a
ccid
ent p
reve
ntio
n m
easure
s; a
nd,
· M
ain
ten
ance
p
ractic
es
and
p
roced
ure
s
of
the
ve
ssels
in
ten
ded
to
se
cure
th
e
co
nta
inm
ent in
teg
rity o
f all e
qu
ipm
ent (e
.g. p
ipew
ork
).
Th
is s
ectio
n d
iscu
sses th
e p
ote
ntia
l for p
lann
ed
dis
ch
arg
es to
se
a w
hic
h m
ay a
rise a
s a
co
nse
qu
ence
of th
e E
&B
deco
mm
issio
nin
g o
pera
tion
s. U
npla
nn
ed
/accid
en
tal re
lease
s a
re
dis
cu
ssed
se
para
tely
(Se
ctio
n 6
.6).
6.2
.1
Ac
tivitie
s (C
au
se o
f Imp
ac
t)
Dis
ch
arg
es o
f inhib
ited s
eaw
ate
r with
possib
le re
sid
ua
l hyd
roca
rbo
ns w
ill take
pla
ce w
hen
th
e p
ipelin
e e
nd
s a
nd
sp
oo
l pie
ces a
re lifte
d th
roug
h th
e w
ate
r co
lum
n. D
eta
iled
dis
ch
arg
e
info
rmatio
n w
ill be c
aptu
red in
the re
leva
nt c
hem
ica
l perm
it app
lica
tion
s.
Du
ring
w
ellh
ea
d se
ve
ran
ce a
nd
o
ther
cuttin
g activ
ities sm
all
qu
an
tities of
inert
abra
siv
e
cu
tter m
ay b
e d
isch
arg
ed
into
the s
ea.
Dis
ch
arg
es to
se
a fro
m v
essels
(inclu
din
g th
e d
rilling
rig) in
the fie
ld a
re c
hara
cte
rised a
s
norm
al o
pe
ratio
na
l dis
ch
arg
es a
nd
are
su
bje
ct to
on
-board
co
ntro
l me
asu
res d
esig
ned
to
se
cure
co
mp
liance
with
the re
qu
irem
ents
of M
AR
PO
L 7
3/7
8. T
hese
dis
ch
arg
es in
clu
de
:
· B
alla
st w
ate
r;
· B
ilge
wa
ter;
· G
enera
l sh
ipbo
ard
dra
inag
e;
· T
rea
ted s
ew
ag
e a
nd g
rey w
ate
r from
acco
mm
oda
tion
an
d a
me
nitie
s; a
nd
· U
npla
nn
ed
rele
ase
s o
f die
sel, h
yd
rau
lic flu
id o
r oth
er h
yd
roca
rbo
ns (s
ee S
ectio
n 7
.6).
Bla
ckb
ird a
nd E
ttrick D
eco
mm
issio
nin
g E
IA
Do
cu
me
nt N
o. E
TR
K0
00
1-G
E-O
000-L
C-R
PT
-0006
No
ve
mb
er 2
016
P
ag
e 7
1 o
f 109
Eq
uip
me
nt m
ay b
e c
onta
min
ate
d w
ith N
OR
M. N
OR
M c
onta
min
ate
d ite
ms w
ill be c
onta
ined
, ta
gg
ed a
nd
sh
ippe
d to
sh
ore
for tre
atm
ent a
nd d
isp
osa
l at a
lice
nse
d p
roce
ssin
g fa
cility
. L
imite
d d
isch
arg
e o
f NO
RM
to s
ea in
line w
ith th
e C
ertific
ate
of A
uth
oris
atio
n w
ill take
pla
ce
durin
g
Ve
sse
l D
eck
cle
an
ing
. T
here
w
ill b
e
no
p
lann
ed
dis
ch
arg
e
as
all
co
nta
min
ate
d
eq
uip
me
nt w
ill co
nta
ined
in th
e re
mo
ve
d, b
ag
ge
d a
nd
tag
ge
d in
frastru
ctu
re.
6.2
.2
Imp
acts
on
Re
ce
pto
rs
All o
f these
asp
ects
prim
arily
imp
act th
e s
eab
ed
and
the w
ate
r co
lum
n w
ith b
en
tho
s a
nd
pla
nkto
n b
ein
g th
e m
ain
recep
tors
.
Th
e lik
elih
oo
d o
f dete
cta
ble
imp
acts
on th
e s
urro
un
din
g w
ate
rs fro
m d
isch
arg
es o
f sm
all
qu
antitie
s o
f resid
ua
l hyd
rocarb
on
is c
onsid
ere
d to
be n
eg
ligib
le a
s h
yd
rod
yn
am
ic c
ond
itions
at th
e s
eab
ed
are
like
ly to
be s
uch th
at ra
pid
dis
pe
rsio
n a
nd
dilu
tion
will o
ccu
r. An
y im
pacts
w
ill be lo
calis
ed a
nd
sh
ort te
rm.
An
y h
yd
roca
rbo
n d
isch
arg
es w
ill be p
erm
itted u
nde
r the O
ffsh
ore
Pe
trole
um
Activ
ities (O
il P
reve
ntio
n a
nd
Co
ntro
l) Re
gu
latio
ns 2
00
5 (a
s a
me
nd
ed
) (OP
PC
) prio
r to u
nd
erta
kin
g th
e
activ
ities. P
ropo
sed
ch
em
ica
l dis
ch
arg
es w
ill be s
ubje
ct to
a c
hem
ica
l risk a
sse
ssm
ent a
nd
perm
itted u
nd
er th
e O
ffsh
ore
Ch
em
ica
ls N
otific
atio
n S
ch
em
e (O
CN
S) (O
ffsh
ore
Ch
em
ica
ls
Re
gu
latio
ns (O
CR
) in th
e U
K a
nd
En
viro
nm
enta
l Pe
rmit in
the N
eth
erla
nd
s).
An
y d
isch
arg
es fro
m v
esse
ls in
the fie
ld w
ill imp
act w
ate
r qu
ality
imm
edia
tely
aro
un
d th
e s
ite
at th
e tim
e o
f dis
ch
arg
e, b
ut im
pacts
will b
e m
inim
al d
ue
to th
e ra
pid
dilu
tion
an
d d
isp
ers
al o
f a
ny p
ollu
tan
ts. Im
pacts
are
there
fore
antic
ipate
d to
be
sh
ort te
rm a
nd lo
calis
ed.
6.2
.3
Tra
nsb
ou
nd
ary
an
d C
um
ula
tive
Imp
acts
Dis
ch
arg
es to
the m
arin
e e
nviro
nm
ent m
ay le
ad
to s
hort-te
rm, lo
calis
ed im
pacts
on m
arin
e
org
anis
ms w
hic
h a
re re
lativ
ely
clo
se to
the d
isch
arg
e p
oin
t su
ch th
at im
pa
cts
on N
orw
eg
ian
wa
ters
, c. 1
42 k
m a
wa
y fro
m th
e E
&B
field
s a
re a
ntic
ipate
d to
be n
eg
ligib
le.
Cu
mu
lativ
e im
pacts
are
co
nsid
ere
d to
b
e h
igh
ly u
nlik
ely
sin
ce th
e im
pacts
aris
ing fro
m
dis
ch
arg
es a
re e
xp
ecte
d to
be s
hort te
rm w
ith ra
pid
dis
pers
ion.
6.2
.4
Co
ntro
l an
d M
itigatio
n M
eas
ure
s
Th
e
rele
ase
d
ch
em
ica
ls
will
be
perm
itted
und
er
the
UK
O
CR
. O
nce
fin
al
ch
em
ica
l re
qu
irem
ents
are
kn
ow
n, a
nd
prio
r to c
om
me
ncem
ent o
f these
activ
ities, N
exe
n w
ill su
bm
it th
e re
leva
nt c
hem
ica
l perm
it app
lica
tion
s s
upp
orte
d b
y a
pp
rop
riate
deta
iled c
hem
ica
l risk
assessm
ents
to B
EIS
in o
rde
r to o
bta
in a
pp
rova
l prio
r to c
hem
ica
l dis
ch
arg
e. C
hem
ica
ls w
ill b
e s
ele
cte
d b
oth
on th
eir te
chn
ica
l sp
ecific
atio
ns a
nd
their e
nviro
nm
enta
l perfo
rma
nce.
An
y d
isch
arg
es o
f NO
RM
to s
ea w
ill be m
inim
ise
d a
nd
will b
e w
ithin
cu
rrently
auth
oris
ed
leve
ls.
Dis
ch
arg
es fro
m ve
ssels
w
ill b
e co
ntro
lled a
nd
m
inim
ise
d th
roug
h th
e u
se of
ope
ratin
g
pro
ce
dure
s
and
syste
ms
for
optim
um
p
erfo
rma
nce,
inclu
din
g
pla
nn
ed
p
reve
nta
tive
m
ain
ten
ance s
yste
ms fo
r peak o
pera
ting
effic
iency o
f on
-board
syste
ms fo
r the
ma
nag
em
ent
of e
ffluen
t, balla
st w
ate
r and
bilg
e w
ate
r. All v
essels
and
the d
rilling
rig c
ontra
cto
rs w
ill be
a
ssesse
d p
rior to
final s
ele
ctio
n to
ensu
re th
e n
ece
ssary
co
ntro
ls a
re in
pla
ce
.
Su
itable
techn
olo
gy fo
r cu
tting
the w
ell h
ea
ds w
ill be
se
lecte
d to
ensu
re th
e e
ffectiv
ene
ss
and
min
imis
e th
e d
ura
tion o
f the c
uttin
g o
pera
tions.
Bla
ckb
ird a
nd E
ttrick D
eco
mm
issio
nin
g E
IA
Do
cu
me
nt N
o. E
TR
K0
00
1-G
E-O
000-L
C-R
PT
-0006
No
ve
mb
er 2
016
P
ag
e 7
2 o
f 109
6.2
.5
Co
nc
lus
ion
s
Th
ere
is
th
e p
ote
ntia
l for
sm
all
qu
antitie
s o
f re
sid
ua
l ch
em
ica
ls a
nd
hyd
roca
rbo
ns to
be
rele
ase
d in
to th
e w
ate
r co
lum
n fro
m liftin
g o
f su
bse
a in
frastru
ctu
re a
nd
from
ve
ssels
used
for
deco
mm
issio
nin
g. T
he s
eab
ed
an
d th
e w
ate
r co
lum
n a
re th
e p
rima
ry re
ce
pto
rs. M
itiga
tion
inclu
de
s
a
su
ccessfu
l p
ost-C
OP
d
eo
iling
pro
gra
mm
e,
ch
em
ica
l sele
ctio
n
pro
ce
sse
s,
perm
itting
of h
yd
roca
rbon
and
ch
em
ica
l dis
ch
arg
es a
nd
stric
t ve
ssel o
pe
ratin
g p
roced
ure
s.
All o
f these im
pacts
will b
e lo
calis
ed a
nd
sh
ort te
rm g
ive
n th
e h
igh
ly d
yn
am
ic e
nviro
nm
ent
aro
un
d E
&B
6.3
S
olid
De
po
sits
on
the S
eab
ed
an
d D
istu
rban
ce
to th
e S
ea
bed
Th
is
se
ctio
n
pro
vid
es
an
assessm
ent
of
the
imp
act
on th
e
se
ab
ed
a
s
a
result
of
the
deco
mm
issio
nin
g w
ork
sco
pe
. Th
e im
pacts
is a
ssesse
d b
y d
ete
rmin
ing
the a
rea
of s
eab
ed
dis
turb
an
ce a
s a
result o
f reco
ve
ry o
f su
bse
a in
frastru
ctu
re, p
lacem
ent o
f rock a
nd
dre
dg
ing
. C
ontro
l and m
itigatio
n m
easu
res in
tend
ed
to m
inim
ise
the im
pact a
re a
lso
co
nsid
ere
d.
6.3
.1
Ac
tivitie
s (C
au
se o
f Imp
ac
t)
Dis
turb
an
ce to
the s
eab
ed
will o
ccur a
s a
result o
f:
· R
em
ova
l of th
e A
oka M
izu
’s a
nch
or s
yste
m;
· P
ositio
nin
g a
nd
anch
orin
g o
f the s
em
i-su
bm
ers
ible
drillin
g rig
at th
e E
&B
field
s. It is
a
ntic
ipate
d th
e rig
w
ill b
e re
qu
ire to
b
e p
ositio
ne
d o
n fo
ur
diffe
rent
locatio
ns
to
co
mp
lete
the P
&A
activ
ities;
· C
uttin
g o
f pile
s a
nd w
ellh
ead
stru
ctu
res;
· Je
tting
to c
lea
r se
dim
ent a
wa
y fro
m p
ipelin
es;
· D
istu
rba
nce o
f se
dim
ent in
the a
rea
of th
e re
cove
red
sp
oo
ls a
nd
end
se
ctio
ns o
f the
pip
elin
es a
nd
su
bse
a in
frastru
ctu
re;
· P
lacin
g of th
e D
TB
, rise
rs a
nd
dyn
am
ica
l u
mb
ilica
ls a
nd
mid
wa
ter
arc
hes o
n th
e
se
ab
ed
as te
mp
ora
ry w
et s
tora
ge p
rior to
rem
ova
l;
· R
ecovery
of m
attre
sses a
nd
gro
ut b
ag
s;
· A
dditio
na
l rock c
ove
r at lo
catio
ns id
en
tified in
Se
ctio
n 2
.6.3
; and
· A
ccid
en
tal d
istu
rba
nce to
the s
eab
ed
co
uld
result fro
m d
rop
ped
obje
cts
; for e
xa
mp
le,
wh
en
recove
ring
the in
frastru
ctu
re.
6.3
.2
Imp
act o
n R
ece
pto
rs
An
estim
ate
of s
eab
ed
dis
turb
an
ce a
sso
cia
ted
with
the p
rop
osed
decom
mis
sio
nin
g a
ctiv
ities
is g
ive
n in
Ta
ble
6-3
. Fro
m th
e ta
ble
it ca
n b
e s
ee
n th
at th
e d
istu
rba
nce a
sso
cia
ted
with
the
ma
jority
of th
e p
ropo
sed a
ctiv
ities is
co
nsid
ere
d te
mp
ora
ry s
uch th
at in
frastru
ctu
re is
bein
g
recove
red
and
the s
eabe
d c
an b
eg
in to
reco
ve
r once
the a
ctiv
ities h
ave
bee
n c
om
ple
ted.
On
ly th
e a
dd
ition o
f rock c
ove
r on th
ose s
ectio
ns o
f pip
elin
e w
here
DoC
or D
oL is
of c
oncern
w
ill ca
use a
pe
rma
ne
nt im
pact.
Bla
ckb
ird a
nd E
ttrick D
eco
mm
issio
nin
g E
IA
Do
cu
me
nt N
o. E
TR
K0
00
1-G
E-O
000-L
C-R
PT
-0006
No
ve
mb
er 2
016
P
ag
e 7
3 o
f 109
Ta
ble
6-3
: An
ticip
ate
d a
rea o
f se
ab
ed
dis
turb
an
ce
.
Infra
stru
ctu
re
As
su
mp
tion
s m
ad
e
Are
a im
pa
cte
d
(km
2)
9 m
oorin
g a
nch
ors
A
ssu
me
s th
e a
rea o
f dis
turb
an
ce
wh
en
jettin
g a
nd
se
ve
ring th
e to
p 3
m o
f each
an
ch
or is
10
m x
10 m
. 0
.00
09
(te
mp
ora
ry)
9 a
nch
or lin
es
Assu
me
s a
ma
xim
um
leng
th o
f 1,4
60 m
of e
ach
line
im
pacts
on th
e s
ea
be
d a
cro
ss a
co
rridor w
idth
of 1
0 m
. 0
.13
14
(te
mp
ora
ry)
Re
co
ve
ry o
f su
rface
la
id s
ectio
ns o
f tre
nch
ed
an
d b
urie
d
pip
elin
es a
nd
um
bilic
als
To
tal le
ngth
of ris
ers
and
dyn
am
ic u
mb
ilica
ls to
be
re
co
ve
red
is 2
,09
0 m
. Th
e a
rea
of s
eab
ed d
istu
rba
nce
is
assum
ed to
be
a c
orrid
or w
idth
of 1
0 m
, allo
win
g fo
r se
dim
ent to
be
mo
ve
d fro
m c
urre
nt lo
ca
tion o
ve
r the
partia
lly b
urie
d p
ipe
line
to e
ither s
ide w
he
re a
pp
lica
ble
0.0
20
9
(tem
pora
ry)
Re
co
ve
ry o
f sp
oo
ls
and u
mb
ilica
l jum
pers
To
tal le
ngth
of s
poo
ls a
nd
um
bilic
al ju
mp
ers
to b
e
reco
ve
red
is 2
,14
5 m
. Th
e a
rea
of s
eab
ed d
istu
rba
nce
is
assum
ed to
be
a c
orrid
or w
idth
of 1
0 m
, allo
win
g fo
r se
dim
ent to
be
mo
ve
d fro
m c
urre
nt lo
ca
tion o
ve
r the
partia
lly b
urie
d p
ipe
line
to e
ither s
ide w
he
re a
pp
lica
ble
.
0.0
21
45
(te
mp
ora
ry)
Dre
dg
ing o
f tran
sitio
n
end
s
As a
wo
rst c
ase
it is a
ssu
me
d th
at 3
0 m
will b
e d
red
ge
d a
t e
ach
en
d o
f each
of th
e tre
nch
ed
and
burie
d flo
wlin
es a
nd
u
mb
ilica
ls (to
tal o
f 840
m d
istu
rbe
d). A
ssu
min
g je
tting
is
requ
ired
a c
orrid
or o
f dis
turb
an
ce
of 1
0 m
is a
ssum
ed
.
0.0
08
4
(tem
pora
ry)
Re
co
ve
ry o
f m
attre
sse
s
To
ca
lcu
late
the a
rea
of d
istu
rba
nce
asso
cia
ted w
ith th
e
rem
ova
l of th
e 4
01 m
attre
sse
s m
easu
ring
6 m
x 3
m a
n
add
itiona
l imp
acte
d a
rea
of 2
m w
as a
ssu
me
d o
n e
ach
sid
e (i.e
. tota
l are
a im
pacte
d b
y 1
ma
ttress is
10 m
x
7 m
).
0.0
28
(te
mp
ora
ry)
Re
co
ve
ry o
f gro
ut
bag
s
Re
co
ve
ry o
f 5,0
00
x 2
5 k
g g
rout b
ags. T
hese
gro
ut b
ag
s
are
a m
ixtu
re o
f ind
ivid
ua
l laid
25 k
g g
rout b
ag
s m
easu
ring
0
.5 m
x 0
.55 m
and
1 T
e g
rout g
ab
ions c
on
tain
ing 4
0 x
25
kg
gro
ut b
ags. A
s a
wo
rst c
ase
the
asse
ssm
ent a
ssu
me
s
all g
rou
t ba
gs a
re la
id in
div
idua
lly. T
he a
rea
of im
pact o
f a
sin
gle
gro
ut b
ag (2
5 k
g) is
assum
ed to
be
0.5
m x
0.5
m.
0.0
08
4
(tem
pora
ry)
Re
co
ve
ry o
f su
bse
a
stru
ctu
res
13 w
ellh
ea
ds, 1
2 X
ma
s tre
es a
nd
asso
cia
ted
co
ntro
l m
odu
les, tw
o m
anifo
lds, o
ne
SS
IV, fo
ur S
DU
, two
va
lve
skid
s, o
ne p
iggin
g s
kid
, rise
r base
an
d h
old
ba
ck p
iles,
DT
B, M
id w
ate
r arc
h a
nd
ba
se
, two
clu
mp
weig
hts
(se
e
Ta
ble
2-1
for d
ime
nsio
ns). A
rea o
f dis
turb
an
ce
assu
me
s
dis
turb
an
ce
up
to 2
m a
t ea
ch
sid
e o
f each
stru
ctu
re. A
ll of
these
stru
ctu
res w
ill be
co
mp
lete
ly re
mo
ve
d fro
m th
e
se
ab
ed
by liftin
g o
nto
ve
sse
l. An
y d
rive
n p
iles w
ill be c
ut
belo
w th
e s
ea
bed
leve
l wh
ilst N
exe
n w
ill en
de
avo
ur to
re
mo
ve
an
y s
uctio
n c
an p
iles. M
ech
an
ica
l cu
tting to
ols
a
re m
ost lik
ely
to b
e u
se
d to
se
ve
r the
driv
en
pile
.
0.0
04
5
(tem
pora
ry)
Drillin
g
rig
anch
ors
a
nd
mo
orin
g lin
es
Assu
me
s a
wo
rst c
ase
of a
sem
i-su
bm
ers
ible
req
uirin
g 1
2
anch
ors
. An
ticip
ate
d th
e rig
will b
e p
ositio
ne
d u
p to
4
time
s. T
here
fore
48 p
lace
me
nts
of d
rill rig a
nch
ors
. A
ssu
me
s a
rea
of im
pact b
y e
ach
an
ch
or p
ositio
nin
g is
4m
2. A
ssu
me
s u
p to
200
m o
f each
an
ch
or lin
e im
pacts
on th
e
se
ab
ed
acro
ss a
co
rridor w
idth
of 1
0 m
0.0
96
2
(tem
pora
ry)
Ro
ck c
ove
r E
stim
ate
d th
at a
len
gth
of 1
,795
m o
f pip
elin
e w
ill req
uire
ro
ck c
ove
r wh
ere
the
re a
re c
once
rns re
ga
rdin
g D
oL
an
d
0.0
13
(p
erm
ane
nt)
Bla
ckb
ird a
nd E
ttrick D
eco
mm
issio
nin
g E
IA
Do
cu
me
nt N
o. E
TR
K0
00
1-G
E-O
000-L
C-R
PT
-0006
No
ve
mb
er 2
016
P
ag
e 7
4 o
f 109
Do
C. T
his
rock w
ill imp
act o
n a
co
rridor w
idth
of 7
m (s
ee
Se
ctio
n 2
.6.3
). Po
ssib
le re
quire
me
nt fo
r rock c
ove
r at
transitio
n e
nd
s. A
ssu
me
s a
wo
rst c
ase
of 5
m o
f rock
co
ve
r imp
actin
g o
n a
co
rrido
r wid
th o
f 7 m
requ
ired
at b
oth
e
nd
s o
f the
14 tre
nch
ed
flow
lines/u
mb
ilica
ls. N
exe
n w
ill e
nd
ea
vo
ur to
min
imis
e th
e p
lace
me
nt o
f an
y a
dditio
na
l ro
ck in
the
field
s.
To
tal e
stim
ate
of te
mp
ora
ry d
istu
rba
nce
0
.31
2 k
m2
To
tal e
stim
ate
of p
erm
ane
nt d
istu
rba
nce
0
.01
3 k
m2
It sh
ou
ld b
e n
ote
d th
at th
e e
stim
ate
s o
f se
ab
ed
dis
turb
an
ce a
ssocia
ted
with
the p
rop
osed
E
&B
deco
mm
issio
nin
g a
ctiv
ities d
o n
ot in
clu
de
dis
turb
an
ce c
ause
d b
y th
e p
ote
ntia
l use o
f b
askets
to re
trieve
sp
oo
ls a
nd
pip
elin
e e
nd
s, e
tc. A
t the tim
e o
f writin
g it w
as n
ot y
et k
now
n
how
m
any
baske
ts
wo
uld
b
e
req
uire
d.
Th
e
se
ab
ed
d
istu
rba
nce
ca
use
d
by
the
use of
baskets
, transp
on
ders
etc
. will b
e a
ssesse
d in
an
enviro
nm
enta
l perm
it app
lica
tion
clo
ser to
th
e tim
e o
f activ
ity. It is
un
like
ly th
at a
ctiv
ities a
ssocia
ted
with
the d
eco
mm
issio
nin
g a
ctiv
ities
will
imp
act
on a
n a
rea g
rea
ter
than
0
.4 km
2 afte
r th
e d
istu
rba
nce
ca
use
d b
y re
cove
ry
baskets
is
a
ccou
nte
d fo
r. T
ab
le 6-3
a
lso
d
oes n
ot
accou
nt
for
the d
eb
ris su
rve
ys and
ove
rtraw
l trials
wh
ich
will b
e u
nd
erta
ke
n o
n th
e c
om
ple
tion
of d
eco
mm
issio
nin
g a
ctiv
ities.
Se
ab
ed
d
istu
rba
nce
from
d
eb
ris
su
rve
ys
wo
uld
o
ccur
at
the
two
fie
lds
and
w
ou
ld
be
te
mp
ora
ry in
natu
re.
Imp
acts
from
recove
ry a
ctiv
ities m
ay re
sult in
the
dire
ct p
hysic
al in
jury
of b
en
thic
sp
ecie
s
and
the re
-su
spe
nsio
n o
f se
ab
ed
se
dim
ents
wh
ich
ca
n im
pact o
n h
ab
itats
/sp
ecie
s o
utw
ith
the im
me
dia
te a
rea o
f activ
ity a
s d
istu
rbe
d s
edim
ent p
artic
les m
ay b
e tra
nsp
orte
d v
ia tid
al
cu
rrents
. Jettin
g is
used
to c
lear s
edim
ents
aw
ay fro
m p
ipelin
es a
nd
results
in liq
uefa
ctio
n
and
co
ars
e s
edim
ent d
ep
ositio
n. T
he w
idth
of th
e d
istu
rba
nce z
one
asso
cia
ted
with
jettin
g is
ty
pic
ally
a
bo
ut
5 m
b
ut
fine
-gra
ined
silt
and
cla
y m
ay d
isp
ers
e fu
rther
(Ca
rter,
201
0).
A
co
nse
rva
tive
dis
turb
an
ce z
one
of 1
0 m
has b
ee
n a
llow
ed fo
r in T
able
6-3
.
Th
e re
-susp
en
sio
n o
f sed
ime
nts
ca
n re
sult in
the
sm
oth
erin
g o
f epifa
una
l ben
thic
sp
ecie
s
(Gu
bb
ay, 2
00
3). W
hils
t so
me
sp
ecie
s m
ay b
e e
xpo
sed
to s
ettle
me
nt o
f on
ly a
sm
all la
ye
r of
se
dim
ents
and
be u
naffe
cte
d, o
thers
ma
y e
xp
erie
nce
thic
ker s
mo
therin
g o
r be u
na
ble
to
tole
rate
a
ny
co
ve
ring
at
all.
Se
ssile
e
pifa
un
al
sp
ecie
s
ma
y
be
partic
ula
rly
affe
cte
d
by
incre
ase
s in
su
spe
nd
ed
se
dim
ent c
once
ntra
tion
s a
s a
result o
f pote
ntia
l clo
gg
ing
or a
bra
sio
n
of s
ensitiv
e fe
ed
ing
and
respira
tory
app
ara
tus (N
ich
olls
, 200
3). L
arg
er, m
ore
mo
bile
an
ima
ls,
su
ch a
s c
rabs a
nd
fish,
are
e
xp
ecte
d to
be a
ble
to a
vo
id a
ny a
dve
rse
su
spe
nd
ed
so
lid
co
nce
ntra
tions
and
a
rea
s
of
dep
ositio
n.
In
the
ca
se
of
filter
feed
ers
, su
ch
as
Arc
tica
isla
nd
ica
, an in
cre
ase
d s
uspe
nd
ed
se
dim
ent c
on
cen
tratio
n c
ould
imp
act th
e a
bility
to fe
ed.
Infa
un
al s
pecie
s th
at a
re fo
un
d w
ithin
the s
edim
en
t ma
y b
e le
ss s
usce
ptib
le to
the n
eg
ativ
e
imp
acts
of s
mo
therin
g. C
onve
rse
ly, re
-su
spe
nsio
n o
f fine p
artic
ula
te m
atte
r ma
y c
log
the
delic
ate
filterin
g a
pp
ara
tus o
f su
spe
nsio
n fe
ed
ers
, wh
ich
ca
n re
sult in
their re
mo
va
l from
silty
se
dim
ents
.
Where
a
vo
idan
ce b
y fis
h is
n
ot
possib
le,
the se
nsitiv
ity to
su
spe
nd
ed
se
dim
ents
va
ries
gre
atly
betw
een
sp
ecie
s a
nd
their life
his
tory
sta
ges, a
nd
dep
en
ds o
n s
edim
ent c
om
positio
n
(partic
le
siz
e
and
a
ng
ula
rity),
co
nce
ntra
tion
and
th
e
dura
tion
of
exp
osu
re
(Ne
wco
mb
e,
199
6). B
ein
g th
e m
ajo
r org
an fo
r respira
tion a
nd
osm
ore
gu
latio
n, g
ills a
re d
irectly
exp
ose
d
to, a
nd
affe
cte
d b
y, s
uspe
nd
ed
so
lids in
the w
ate
r. If se
dim
ent p
artic
les a
re c
aug
ht in
or o
n
the g
ills,
gas e
xch
an
ge
with
th
e
wa
ter
ma
y b
e re
du
ced
le
ad
ing
to
o
xyg
en d
ep
riva
tion
(Essin
k, 1
99
9; C
lark
e, 2
000
). Th
is e
ffect is
gre
ate
st fo
r juve
nile
fish
as th
ey h
ave
sm
all e
asily
clo
gg
ed g
ills a
nd h
igh
er o
xyg
en d
em
and
(FeB
EC
, 201
0).
Bla
ckb
ird a
nd E
ttrick D
eco
mm
issio
nin
g E
IA
Do
cu
me
nt N
o. E
TR
K0
00
1-G
E-O
000-L
C-R
PT
-0006
No
ve
mb
er 2
016
P
ag
e 7
5 o
f 109
Th
e a
bility
for o
rga
nis
ms to
dete
ct p
red
ato
rs m
ay a
lso
be re
du
ced
as a
resu
lt of lo
w v
isib
ility
associa
ted
with
su
sp
end
ed
se
dim
ents
. In in
sta
nce
s o
f pers
iste
nt a
nd
wid
esp
rea
d s
usp
end
ed
se
dim
ents
there
is th
e p
ossib
ility o
f redu
ced
feedin
g s
uccess a
mo
ng
juve
nile
fish
wh
ich
ma
y
influ
en
ce s
urv
iva
l, ye
ar-c
lass s
treng
th, re
cru
itme
nt a
nd o
ve
rall c
ond
ition (C
lark
e, 2
00
0).
Ro
ck c
ove
r will d
irectly
imp
act a
num
ber o
f se
ctio
ns a
long
the p
ipelin
es (S
ectio
n 2
.6.3
). The
wid
th o
f imp
act is
take
n a
s 7
m b
ase
d o
n th
e ty
pic
al ro
ck b
erm
pro
file. S
edim
ents
ma
y b
e
tem
pora
rily d
istu
rbe
d o
ve
r a s
ligh
tly g
rea
ter c
orrid
or w
idth
but a
ny re
susp
en
sio
n o
f se
dim
ent
wou
ld b
e s
hort te
rm, o
nly
occurrin
g d
urin
g th
e a
ctu
al ro
ck p
lacem
ent o
pe
ratio
ns.
Re
mo
va
l of th
e in
frastru
ctu
re m
ean
s th
at th
e s
ea
be
d b
en
ea
th th
e re
cove
red
infra
stru
ctu
re
ca
n b
eg
in re
cove
ry. S
ite s
urv
eys c
ond
ucte
d a
cro
ss th
e p
roje
ct a
rea h
ave
not id
en
tified a
ny
se
nsitiv
e h
ab
itats
, se
nsitiv
e s
pecie
s o
r hab
itats
/sp
ecie
s o
f partic
ula
r co
nse
rva
tion
co
nce
rn.
In a
dd
ition, th
e m
ajo
rity o
f ben
thic
sp
ecie
s w
hic
h w
ere
iden
tified in
the s
urv
eys a
re w
idely
d
istrib
ute
d a
nd
it is e
xp
ecte
d th
at th
ey w
ill to re
turn
to th
e d
istu
rbed
are
a a
fter th
e w
ork
is
co
mp
lete
d.
An
y im
pacts
from
the p
ropo
sed
deco
mm
issio
nin
g a
ctiv
ities a
re e
xp
ecte
d to
be s
hort liv
ed
sin
ce m
ost o
f the s
ma
ller s
ede
nta
ry s
pecie
s a
ssocia
ted
with
the a
rea
(su
ch a
s p
oly
ch
ae
te
wo
rms)
have
sh
ort
lifecycle
s a
nd
re
cru
itme
nt
of
new
in
div
idua
ls fro
m o
uts
ide th
e a
rea
dis
turb
ed
will b
e ra
pid
. Re
-co
lonis
atio
n o
f the im
pa
cte
d a
rea
s c
an ta
ke
pla
ce in
a n
um
ber o
f w
ays, in
clu
din
g m
obile
sp
ecie
s m
ovin
g in
from
the
edg
es o
f the a
rea (im
mig
ratio
n), ju
ve
nile
re
cru
itme
nt fro
m th
e p
lankto
n a
nd b
urro
win
g s
pecie
s d
igg
ing
ba
ck to
the s
urfa
ce.
Ma
rine
gro
wth
is e
ntire
ly o
rga
nic
in o
rigin
, there
fore
any m
arin
e g
row
th w
hic
h fa
lls in
to th
e
se
a is
unlik
ely
to le
ad
to a
ny im
pact o
the
r than
a s
hort te
rm in
cre
ase
in s
uspe
nd
ed
so
lids.
Th
is is
like
ly to
be
rapid
ly d
isp
ers
ed b
y h
yd
rod
yn
am
ic c
ond
itions. M
arin
e g
row
th w
ill natu
rally
b
iode
gra
de
with
in th
e n
orm
al e
cosyste
m c
ycle
and
it is h
igh
ly u
nlik
ely
that it w
ill lead
to
dete
cta
ble
imp
acts
there
fore
the im
pact is
co
nsid
ere
d to
be lo
w.
6.3
.3
Tra
nsb
ou
nd
ary
an
d C
um
ula
tive
Th
e E
&B
field
s a
re lo
cate
d c
. 142 k
m fro
m th
e U
K/N
orw
eg
ian m
edia
n lin
e. A
s th
e im
pacts
fro
m
the
decom
mis
sio
nin
g
activ
ities
will
be
rela
tive
ly
local
and
sh
ort
term
, sig
nific
ant
transb
ou
nd
ary
or c
um
ula
tive
imp
acts
are
not a
ntic
ipate
d.
6.3
.4
Co
ntro
l an
d M
itigatio
n M
eas
ure
s
Th
e fo
llow
ing
me
asu
res w
ill be a
do
pte
d to
ensure
that s
eab
ed
dis
turb
ance
and
its im
pacts
a
re m
inim
ise
d to
‘as lo
w a
s re
aso
na
bly
pra
ctic
able
’:
· A
ll activ
ities w
hic
h m
ay le
ad
to s
eab
ed
dis
turb
an
ce w
ill be p
lann
ed
, ma
na
ge
d a
nd
imp
lem
en
ted in
su
ch a
wa
y th
at d
istu
rba
nce is
min
imis
ed;
· A
se
ab
ed
su
rve
y w
ill be
ca
rried o
ut a
nd
deta
iled a
nch
orin
g p
lans fo
r the d
rilling
rig
will b
e p
ut in
pla
ce;
· R
ock p
lacem
ent w
ill only
be u
nd
erta
ke
n in
limite
d a
rea
s fo
r the p
ipelin
es w
hic
h a
re
rem
ain
ing
in
situ
, a
nd
in
line
with
th
e
optio
ns
se
lecte
d
at
the
co
mp
ara
tive
a
ssessm
ent;
· A
fall p
ipe w
ill be u
sed
to d
irect th
e ro
ck c
ove
r to th
e c
orre
ct lo
catio
n;
· C
are
ful p
lann
ing
, se
lectio
n o
f eq
uip
me
nt, a
nd
ma
na
gem
ent a
nd
imp
lem
enta
tion
of
activ
ities (e
spe
cia
lly w
ate
r-jettin
g);
· A
ll dro
pp
ed
obje
cts
will b
e re
po
rted to
BE
IS v
ia a
PO
N 2
and
Ne
xe
n w
ill aim
to
recove
r all d
rop
ped o
bje
cts
; and
Bla
ckb
ird a
nd E
ttrick D
eco
mm
issio
nin
g E
IA
Do
cu
me
nt N
o. E
TR
K0
00
1-G
E-O
000-L
C-R
PT
-0006
No
ve
mb
er 2
016
P
ag
e 7
6 o
f 109
· A
deb
ris s
urv
ey w
ill be u
nd
erta
ke
n a
t the c
om
ple
tion
of th
e d
ecom
mis
sio
nin
g. A
ny
‘fore
ign
’ m
ate
rial,
iden
tified
as
resu
lting
fro
m
deco
mm
issio
nin
g
activ
ities
will
be
re
cove
red
from
the s
eabe
d w
here
possib
le. T
hose
not re
cove
red
will b
e e
nte
red in
to
the F
ish
Safe
data
base
.
6.3
.5
Co
nc
lus
ion
Th
e prin
cip
al
so
urc
es of
se
ab
ed
d
istu
rban
ce asso
cia
ted
w
ith th
e E
&B
d
eco
mm
issio
nin
g
activ
ities co
nce
rn th
e re
mo
va
l o
f stru
ctu
res,
sp
oo
ls,
ma
ttresse
s a
nd
g
rout
bag
s,
cu
tting
ope
ratio
ns, a
nch
orin
g o
f the s
em
i-su
bm
ers
ible
drillin
g rig
and
the p
lacem
ent o
f add
itiona
l ro
ck c
ove
r on th
e e
xp
ose
d p
ipelin
e e
nds. T
hese a
ctiv
ities w
ill result in
the
dis
pla
cem
ent o
f su
bstra
te a
nd
the s
uspen
sio
n a
nd
su
bse
qu
ent s
ettle
me
nt o
f se
dim
ent. S
tand
ard
me
asu
res
to c
ontro
l dis
turb
an
ce
inclu
de
op
era
tiona
l pla
nn
ing a
nd
eq
uip
me
nt s
ele
ctio
n.
Th
e s
pecie
s a
nd
hab
itats
obse
rve
d in
the v
icin
ity o
f the E
&B
field
s a
re re
lativ
ely
wid
esp
rea
d
thro
ug
hout
the
CN
S
and
th
e
are
a
antic
ipate
d to
b
e
imp
acte
d re
pre
sen
ts
a
ve
ry
sm
all
perc
enta
ge
of th
e a
va
ilab
le h
ab
itat. F
urth
erm
ore
, all d
istu
rbe
d s
edim
ents
are
exp
ecte
d to
re
cove
r rapid
ly th
oug
h re
cru
itme
nt fro
m a
dja
ce
nt u
nd
istu
rbe
d a
reas.
In sum
mary
, d
ue to
th
e lo
calis
ed a
nd
re
lativ
ely
sh
ort
dura
tion of
the d
eco
mm
issio
nin
g
activ
ities,
and
w
ith
the
iden
tified
co
ntro
l a
nd
m
itigatio
n
me
asure
s
in
pla
ce,
the
ove
rall
sig
nific
ance
of th
e im
pact o
f se
ab
ed d
istu
rban
ce a
s a
result o
f the d
eco
mm
issio
nin
g o
f E&
B
field
s is
co
nsid
ere
d to
be lo
w.
6.4
U
nd
erw
ate
r No
ise
Th
is s
ectio
n c
onsid
ers
the
imp
act o
n m
arin
e re
cep
tors
of u
nd
erw
ate
r nois
e g
enera
ted d
urin
g
the p
rop
osed
E&
B d
eco
mm
issio
nin
g a
ctiv
ities. T
he
imp
act is
assesse
d b
y re
vie
win
g th
e ty
pe
of n
ois
e lik
ely
to b
e g
en
era
ted a
nd d
ocum
ente
d e
vid
en
ce o
f the e
ffects
of s
uch
nois
e o
n
ma
rine
recepto
rs, a
nd
co
mp
arin
g th
e e
xp
ecte
d n
ois
e le
ve
ls w
ith re
cog
nis
ed th
resh
old
s fo
r im
pacts
.
6.4
.1
Ac
tivitie
s (C
au
se o
f Imp
ac
t)
Hu
ma
n
activ
ities
at
se
a
ge
ne
rate
u
nd
erw
ate
r so
un
d.
Th
e
ch
ara
cte
ristic
s
of
the
so
un
d
pro
du
ced
, in te
rms o
f the
am
plitu
de
, rang
e o
f freq
uen
cie
s a
nd
tem
pora
l featu
res, v
arie
s w
ith
the ty
pe o
f activ
ity a
nd
eq
uip
me
nt. S
oun
d le
ve
ls in
the m
arin
e e
nviro
nm
ent d
imin
ish
with
d
ista
nce
from
the s
ourc
e.
Th
e m
ain
so
urc
es of
un
de
rwa
ter
so
un
d a
ssocia
ted
w
ith th
e p
rop
osed d
eco
mm
issio
nin
g
activ
ities a
t E&
B w
ill be:
· A
co
ustic
surv
eyin
g e
qu
ipm
ent;
· V
essels
of v
ario
us ty
pes, a
ll of w
hic
h w
ill be u
sin
g D
P;
· C
uttin
g to
ols
and o
ther d
ive
r tools
;
· P
lacem
ent o
f rock c
ove
r.
It is n
ot k
now
n a
t this
sta
ge
wh
eth
er a
cou
stic
surv
eys w
ould
be re
qu
ired a
s p
art o
f the p
ost
deco
mm
issio
nin
g
su
rve
y
and
m
onito
ring
p
rog
ram
me
a
s
vis
ual
su
rve
ys
ma
y
su
ffice.
Ho
we
ve
r, p
ote
ntia
l im
pacts
fro
m a
cou
stic
su
rveyin
g h
as b
ee
n in
clu
de
d a
s a
w
ors
t ca
se
sce
na
rio.
As s
how
n in
Ta
ble
2-5
a ra
ng
e o
f sp
ecia
list a
nd
su
pp
ort v
essels
(DS
V, C
SV
, AH
V, ro
ck
co
ve
r ve
ssel, g
uard
ve
sse
ls) w
ill be re
qu
ired to
und
erta
ke th
e p
rop
osed d
eco
mm
issio
nin
g
Bla
ckb
ird a
nd E
ttrick D
eco
mm
issio
nin
g E
IA
Do
cu
me
nt N
o. E
TR
K0
00
1-G
E-O
000-L
C-R
PT
-0006
No
ve
mb
er 2
016
P
ag
e 7
7 o
f 109
activ
ities. T
he to
tal n
um
be
r of d
ays d
urin
g w
hic
h v
essels
are
antic
ipate
d to
be p
rese
nt in
the
E&
B fie
lds is
870, w
ith u
p to
5 v
essels
bein
g o
n lo
catio
n a
t any o
ne
time.
Cu
tting
activ
ities w
ill take
pla
ce a
t the w
ells
, with
in th
e F
PS
O 5
00
m z
one
to c
ut th
e m
oorin
g
lines a
nd
rise
rs, th
e M
WA
teth
ers
, at th
e e
xp
ose
d p
ipelin
e a
nd
um
bilic
al e
nd
s a
nd
at th
e
va
riou
s s
ub
se
a s
tructu
res (m
anifo
lds, S
SIV
, SD
Us e
tc.).
Th
e m
anifo
ld a
nd
mo
orin
g p
iles w
ill nee
d to
be c
ut.
Ro
ck c
ove
r will b
e re
qu
ired a
t so
me
of th
e p
ipelin
e e
nd
s o
n th
ose
se
ctio
ns o
f pip
elin
e a
nd
u
mb
ilica
ls w
here
Do
C a
nd
or D
oL is
of a
co
ncern
(se
e T
able
2-4
). A fa
ll pip
e w
ill be u
sed
to
accura
tely
lay th
e ro
ck c
ove
r at th
e re
qu
ired lo
catio
ns.
6.4
.2
Imp
acts
on
Re
ce
pto
rs
Ha
rbo
ur p
orp
ois
e, m
inke w
hale
, wh
ite-b
ea
ke
d d
olp
hin
, wh
ite-s
ided
dolp
hin
, Ris
so
’s d
olp
hin
a
nd
kille
r w
hale
h
ave
b
ee
n sig
hte
d in
th
e E
&B
d
eve
lopm
ent
are
a (R
eid
e
t a
l., 2
00
3).
Sig
htin
gs m
ain
ly o
ccurre
d in
th
e sum
mer
mo
nth
s (s
ee S
ectio
n 3.3
.4.).
A ra
ng
e of
fish
sp
ecie
s u
se th
e a
rea fo
r nurs
ery
and
/ or s
paw
nin
g g
roun
d a
t diffe
rent tim
es o
f the y
ear
inclu
din
g h
ad
do
ck,
lem
on so
le,
ma
cke
rel,
sp
rat
and
w
hitin
g (C
oull
et
al.,
199
8).
Furth
er
deta
ils a
re g
ive
n in
Se
ctio
n 4
.2.3
.
So
un
d is
imp
orta
nt fo
r ma
rine m
am
ma
ls fo
r navig
atio
n, c
om
mu
nic
atio
n a
nd
pre
y d
ete
ctio
n
(So
uth
all,
200
7;
Ric
hard
son
, 1
99
5).
Intro
du
ctio
n
of
anth
rop
og
enic
un
de
rwa
ter
so
un
d,
there
fore
, has th
e p
ote
ntia
l to im
pact o
n m
arin
e m
am
ma
ls if it in
terfe
res w
ith th
e a
bility
of a
n
anim
al
to u
se
a
nd
re
ceiv
e so
un
d (O
SP
AR
, 2
009
). T
he im
pact
of
sou
nd
o
n a
n a
nim
al
dep
en
ds o
n m
any fa
cto
rs
inclu
din
g th
e le
ve
l a
nd
ch
ara
cte
ristic
s of
the so
un
d,
hea
ring
se
nsitiv
ity o
f the s
pecie
s a
nd
be
havio
ur o
f the s
pecie
s.
An
thro
pog
enic
so
un
d m
ay in
terfe
re w
ith a
cou
stic
co
mm
unic
atio
n, p
reda
tor a
vo
idan
ce, p
rey
dete
ctio
n,
repro
du
ctio
n a
nd
n
avig
atio
n in
fis
h (S
labb
eko
orn
e
t a
l., 2
010
). T
he effe
cts
of
“exce
ssiv
e” s
oun
d o
n fis
h in
clu
de
avo
idan
ce re
actio
ns a
nd
ch
ang
es in
sh
oa
ling
beh
avio
ur.
Avo
idan
ce o
f an a
rea
ma
y in
terfe
re w
ith fe
ed
ing
or re
pro
du
ctio
n o
r ca
use
stre
ss-in
du
ced
re
du
ctio
n in
gro
wth
an
d re
pro
du
ctiv
e o
utp
ut (S
labb
eko
orn
et a
l., 201
0).
A
co
us
tic S
urv
eyin
g E
qu
ipm
en
t 6
.4.2
.1
Se
ab
ed
su
rve
ys
ca
rried
o
ut
as
part
of
decom
mis
sio
nin
g
will
typ
ica
lly
em
plo
y
acou
stic
su
rve
yin
g e
qu
ipm
ent s
uch
as s
ide
-sca
n s
ona
r (SS
S) a
nd
echo
so
un
ders
to g
enera
te im
ag
es
of th
e s
eab
ed. A
irgu
ns a
re n
ot e
xp
ecte
d to
be u
se
d.
Th
e im
pact o
f acou
stic
su
rve
y e
qu
ipm
en
t so
un
d o
n m
arin
e m
am
ma
ls d
epe
nd
s o
n fre
qu
ency,
puls
e c
hara
cte
ristic
s (e
.g. d
ura
tion, re
pe
tition
rate
and
inte
rmitte
ncy), s
ou
rce
and
receiv
ed
leve
ls,
dire
ctiv
ity,
bea
m w
idth
a
nd
re
cep
tor
spe
cie
s.
A re
vie
w o
f th
e im
pact
of
aco
ustic
su
rve
yin
g te
chn
iqu
es o
n m
arin
e fa
un
a in
the A
nta
rctic
co
nclu
de
d th
at a
cou
stic
instru
me
nts
su
ch a
s S
SS
and
ma
ny e
cho
so
un
ders
are
of s
uffic
iently
low
po
we
r and
hig
h fre
qu
en
cy a
s to
p
ose
o
nly
a
m
inor
risk
to
the
e
nviro
nm
ent.
Airg
uns
and
low
-frequ
en
cy,
hig
h
pow
er
transd
ucers
with
a w
ide b
ea
m w
idth
are
of g
rea
ter c
once
rn (S
CA
R, 2
00
2). T
his
co
ncu
rs w
ith
a re
vie
w b
y R
ich
ard
son
et a
l., (199
5), w
hic
h fo
und
mo
st e
vid
en
ce fo
r a b
eh
avio
ura
l respo
nse
to
so
nar
opera
ting
at
freq
uen
cie
s a
rou
nd 3
kH
z to
1
3 kH
z a
nd
n
o o
bvio
us re
spo
nse
to
p
ing
ers
, echo
so
un
ders
and
oth
er p
uls
ed s
oun
d a
t hig
her fre
que
ncie
s u
nle
ss th
e re
ceiv
ed
leve
ls w
ere
ve
ry h
igh
. Be
ha
vio
ura
l respo
nse
s in
clu
de
d a
vo
idan
ce a
nd
ch
ang
es in
sw
imm
ing
beh
avio
ur a
nd
vo
calis
atio
n.
For e
cho
so
un
ders
opera
ting
in s
ha
llow
wa
ter d
ep
ths s
uch a
s a
t the E
&B
field
s, th
e h
igh
-end
of
freq
uen
cie
s o
uts
ide th
e h
ea
ring
ra
ng
e of
ma
rine
sp
ecie
s are
u
se
d,
wh
ich
a
ttenu
ate
Bla
ckb
ird a
nd E
ttrick D
eco
mm
issio
nin
g E
IA
Do
cu
me
nt N
o. E
TR
K0
00
1-G
E-O
000-L
C-R
PT
-0006
No
ve
mb
er 2
016
P
ag
e 7
8 o
f 109
rapid
ly, a
nd
the o
pe
ratin
g p
ow
er is
low
er th
an
in d
ee
pe
r wa
ter (J
NC
C, 2
010
). Un
de
r these
co
nd
itions JN
CC
co
nsid
ers
th
at
inju
ry o
r d
istu
rban
ce w
ould
b
e u
nlik
ely
. S
imila
rly,
JN
CC
co
nsid
er th
e ris
k o
f inju
ry o
r dis
turb
an
ce fro
m S
SS
to b
e n
eg
ligib
le b
eca
use
of th
e h
igh
freq
uen
cie
s th
at a
re o
uts
ide th
e h
ea
ring
rang
e o
f marin
e m
am
ma
ls a
nd
atte
nu
ate
rapid
ly
and
the s
hort d
ura
tion o
f this
typ
e o
f surv
ey.
Ve
ry little
info
rmatio
n is
ava
ilable
on th
e p
ote
ntia
l effe
cts
of S
SS
and
echo
so
un
de
rs o
n fis
h
(Po
pp
er, 2
00
8 a
nd
ICE
S, 2
00
5). E
xp
erim
ents
exp
osin
g c
ag
ed fis
h o
f va
riou
s s
pecie
s to
mid
-fre
qu
en
cy (2
.8-3
.5 k
Hz) s
ona
r at a
rece
ive
d s
oun
d p
ressu
re le
ve
ls (S
PL
) of 2
10
dB
re 1
µP
a
root-m
ean-s
qu
are
(rms) fo
un
d e
vid
en
ce o
f tem
po
rary
hea
ring
dam
ag
e in
fish
with
hea
ring
se
nsitiv
ity
in
the
freq
ue
ncy
rang
e
ge
ne
rate
d
by
the
so
urc
e
but
not
those
w
ith
low
er
freq
uen
cy h
ea
ring
. He
arin
g d
am
ag
e re
cove
red
with
in 2
4 h
ou
rs a
nd
no e
vid
en
ce o
f path
olo
gy
or m
orta
lity w
as fo
un
d (H
alv
ors
en
et a
l., 201
2).
Un
pu
blis
hed
wo
rk b
y th
e N
orw
eg
ian D
efe
nce
Re
sea
rch
Esta
blis
hm
ent (J
org
ense
n e
t al.,
200
5; p
rese
nte
d in
Kva
ldshe
im e
t al., 2
00
5) e
xp
ose
d la
rva
l and
juve
nile
fish
to s
imu
late
d
so
na
r sig
nals
at 1
.5 k
Hz, 4
kH
z a
nd
6.5
kH
z to
inve
stig
ate
pote
ntia
l effe
cts
on s
urv
iva
l, d
eve
lopm
ent a
nd
beh
avio
ur. T
he fis
h s
pecie
s u
sed
we
re h
errin
g (C
lupe
a h
are
ng
us), A
tlantic
co
d (G
adus m
orh
ua
), sa
ithe (P
olla
chiu
s vire
ns)
and
sp
otte
d w
olfis
h (A
narh
ich
as m
inor).
Re
ceiv
ed so
un
d le
ve
ls ra
ng
ed fro
m 1
50
to
1
89
d
B re
1
µ
Pa
. T
he on
ly e
ffects
o
n fis
h
beh
avio
ur w
ere
so
me
sta
rtle o
r pan
ic m
ove
me
nts
by h
errin
g fo
r so
un
ds a
t 1.5
kH
z a
nd
there
w
ere
no lo
ng
-term
effe
cts
on b
eh
avio
ur, g
row
th o
r su
rviv
al. T
here
wa
s n
o d
am
ag
e to
inte
rna
l o
rga
ns a
nd n
o m
orta
lity a
pa
rt from
in tw
o g
rou
ps o
f herrin
g (o
ut o
f ove
r 40
tests
) at re
ceiv
ed
so
un
d le
ve
ls o
f 189
dB
, for w
hic
h th
ere
wa
s a
po
st-e
xp
osu
re m
orta
lity o
f 20 to
30%
. He
rring
ca
n d
ete
ct h
igh
er fre
qu
en
cie
s th
an a
re d
ete
cte
d b
y th
e o
ther s
pecie
s in
the
stu
dy.
V
ess
els
6
.4.2
.2
Th
e p
rimary
so
urc
es o
f so
un
d fro
m v
essels
are
pro
pe
llers
, pro
pu
lsio
n a
nd
oth
er m
achin
ery
(R
oss, 1
97
6 a
nd
Wale
s e
t al., 2
00
2). In
ge
nera
l, ve
ssel s
oun
d is
co
ntin
uo
us a
nd
results
from
n
arro
wb
an
d
tona
l so
un
ds
at
sp
ecific
fre
qu
en
cie
s
and
b
roa
dba
nd
so
un
ds.
Aco
ustic
b
roa
dba
nd
so
urc
e le
ve
ls ty
pic
ally
incre
ase
with
incre
asin
g v
essel s
ize
, with
sm
alle
r ve
ssels
(<
50 m
) havin
g a
so
urc
e rm
s s
oun
d p
ressu
re le
ve
l (SP
L) o
f 160
-175
dB
re 1
μP
a a
t 1 m
, m
ediu
m s
ize
ve
ssels
(50
-100
m) 1
65
-180 d
B re
1μ
Pa
at 1
m a
nd
larg
e v
essels
(> 1
00 m
) 180-1
90
dB
re 1
μP
a a
t 1 m
(Ric
hard
son e
t al., 1
995
). Ho
we
ve
r, so
un
d le
ve
ls d
ep
en
d o
n th
e
ope
ratin
g
sta
tus
of
the
ve
ssel
and
ca
n
va
ry
co
nsid
era
bly
in
tim
e.
Aco
ustic
e
ne
rgy
is
stro
ng
est a
t freq
uen
cie
s b
elo
w 1
kH
z.
So
me
of th
e v
essels
used
for th
e p
rop
osed
activ
ities w
ill use D
P s
yste
ms to
ma
inta
in a
nd
adju
st th
eir p
ositio
n w
he
n w
ork
ing
. So
un
d le
ve
ls c
an b
e lo
ud
er d
urin
g u
se o
f DP
, wh
ich
re
qu
ires th
e o
pera
tion o
f thru
ste
rs to
co
ntro
l a s
hip
’s lo
catio
n.
Ric
hard
son
et a
l. (199
5) re
vie
we
d th
e e
ffects
of v
essel n
ois
e o
n m
arin
e m
am
ma
ls. T
hey
note
d th
at it is
not a
lwa
ys p
ossib
le to
dis
ting
uis
h b
etw
een
effe
cts
due to
the s
oun
d, s
ight o
r e
ve
n s
me
ll of a
ve
ssel to
an a
nim
al b
ut th
ere
is e
vid
en
ce th
at n
ois
e fro
m v
essels
has a
n
imp
act o
n m
arin
e m
am
ma
ls. A
nim
als
have
bee
n re
po
rted to
dis
pla
y a
rang
e o
f reactio
ns
from
ign
orin
g to
avo
idin
g th
e n
ois
e. T
he la
tter c
an le
ad
to te
mp
ora
ry d
isp
lacem
ent fro
m a
n
are
a.
Ve
ssel
nois
e
ca
n
ma
sk
co
mm
unic
atio
n
ca
lls
betw
een
ce
tace
ans,
redu
cin
g
their
co
mm
unic
atio
n ra
ng
e (J
ense
n e
t al., 2
00
9). E
xp
osure
to lo
w fre
qu
en
cy s
hip
nois
e m
ay b
e
associa
ted
w
ith ch
ron
ic stre
ss in
w
hale
s.
Ro
lland
e
t a
l., (2
01
2)
reporte
d a
d
ecre
ase
in
b
ase
line
leve
ls
of
stre
ss-re
late
d
faeca
l h
orm
one
s
co
ncu
rrent
with
a
6
dB
re
du
ctio
n
in
und
erw
ate
r nois
e a
long
the s
hip
pin
g la
ne
in th
e B
ay o
f Fun
dy, C
ana
da
, in 2
00
1.
Bla
ckb
ird a
nd E
ttrick D
eco
mm
issio
nin
g E
IA
Do
cu
me
nt N
o. E
TR
K0
00
1-G
E-O
000-L
C-R
PT
-0006
No
ve
mb
er 2
016
P
ag
e 7
9 o
f 109
The
E&
B in
frastru
ctu
re is
locate
d in
a w
ell-d
eve
lope
d o
il and
ga
s a
rea in
the N
orth
Se
a
alth
ou
gh le
ve
ls o
f sh
ippin
g a
ctiv
ity a
re d
escrib
ed a
s m
odera
te (S
ectio
n 4
.1.1
), marin
e fa
un
a
in th
e a
rea
is
a
lread
y e
xp
ose
d to
th
e ty
pes o
f so
un
d th
at
will
be g
ene
rate
d d
urin
g th
e
pro
po
sed
decom
mis
sio
nin
g. T
he re
porte
d re
spo
nse
of a
nim
als
to re
ceiv
ed s
oun
d h
as b
ee
n
foun
d to
wa
ne
with
repe
ate
d e
xp
osu
re in
som
e s
tudie
s (S
outh
all, 2
00
7). It is
exp
ecte
d th
at
alth
ou
gh
ve
ssels
associa
ted
with
the d
eco
mm
issio
nin
g a
ctiv
ities w
ill add
to th
e b
ackg
rou
nd
nois
e, th
e o
ve
rall im
pact w
ill not b
e s
ign
ifica
nt.
Fis
h e
xh
ibit a
vo
idan
ce re
actio
ns to
ve
ssels
and
it is lik
ely
that ra
dia
ted
und
erw
ate
r nois
e is
th
e c
ue. F
or e
xa
mp
le, n
ois
e fro
m re
sea
rch
ve
sse
ls h
as th
e p
ote
ntia
l to b
ias fis
h a
bu
nd
an
ce
su
rve
ys b
y c
ausin
g fis
h to
mo
ve
aw
ay (d
e R
obe
rtis, 2
01
3; M
itso
n, 2
00
3). R
eactio
ns in
clu
de
d
ivin
g, h
oriz
onta
l mo
ve
me
nt a
nd c
hang
es in
tilt ang
le (d
e R
obertis
, 201
3).
U
nd
erw
ate
r Cu
tting
6
.4.2
.3
Cu
tting
of u
nd
erw
ate
r stru
ctu
res c
an b
e a
chie
ve
d th
roug
h v
ario
us m
eth
od
s, w
hic
h fa
ll larg
ely
u
nd
er
the
cate
go
ries
of
me
cha
nic
al,
therm
al,
ele
ctro
ch
em
ica
l a
nd
e
xp
losiv
e
cu
tting
. M
echa
nic
al
me
tho
ds u
se
h
ard
cuttin
g to
ols
th
at
pro
du
ce
a
sa
win
g o
r m
achin
ing
actio
n.
Exa
mp
les in
clu
de
h
yd
rau
lic sh
ea
rs a
nd
a
bra
siv
e w
ate
r je
t cu
tters
. T
herm
al
cu
tting,
e.g
. u
sin
g o
xy-a
rc c
utte
rs, in
vo
lve
s g
ene
ratin
g s
uffic
ient h
ea
t and
an o
xyg
en s
upp
ly in
ord
er to
b
urn
thro
ug
h s
teel. E
lectro
ch
em
ica
l techn
iqu
es u
se a
n e
lectro
lyte
and
su
itable
pote
ntia
l to
rem
ove
ste
el.
Th
ere
is v
ery
little in
form
atio
n a
va
ilable
on u
nd
erw
ate
r so
un
d g
enera
ted
by to
ols
used
for
und
erw
ate
r cu
tting
opera
tion
s.
An
tho
ny
et
al.
(200
9)
pre
sen
t a
re
vie
w
of
pub
lish
ed
unde
rwa
ter n
ois
e m
easu
rem
ents
for v
ario
us ty
pes o
f div
er-o
pe
rate
d to
ols
. Se
ve
ral o
f these
a
re u
nd
erw
ate
r cuttin
g to
ols
, inclu
din
g a
hig
h-p
ressure
wa
ter je
t lance, c
hain
saw
, grin
de
r a
nd
oxy-a
rc c
utte
r. Re
po
rted s
ourc
e s
oun
d p
ressu
re le
ve
ls w
ere
148
-170
.5 d
B re
1µ
Pa (it
wa
s n
ot
indic
ate
d w
heth
er
these
are
rm
s o
r ze
ro-p
eak).
It is
p
ossib
le th
at
larg
er,
RO
V
ope
rate
d
cuttin
g
tools
co
uld
g
ene
rate
lo
ud
er
so
un
d
leve
ls
but
no
pub
lish
ed
d
ata
a
re
ava
ilable
.
Th
ere
is
n
o p
ub
lish
ed
in
form
atio
n in
th
e re
spon
se of
ma
rine
m
am
ma
ls o
r fis
h to
so
un
d
ge
nera
ted
b
y
und
erw
ate
r cu
tting
. H
ow
eve
r, re
po
rted
so
urc
e
leve
ls
are
re
lativ
ely
lo
w
co
mp
are
d w
ith th
ose
gen
era
ted b
y v
essels
and
cu
tting o
pe
ratio
ns a
re e
xp
ecte
d to
be o
f sh
ort d
ura
tion, th
ere
fore
cu
tting
is n
ot lik
ely
to c
ause
sig
nific
ant d
istu
rba
nce
to m
arin
e fa
un
a.
R
ock
Co
ve
r 6
.4.2
.4
No
data
are
ava
ilable
on
wh
at th
e n
ois
e le
ve
ls g
enera
ted
by th
e p
lacem
ent o
f rock c
ove
r m
ight b
e, h
ow
eve
r it is b
elie
ve
d th
at g
ive
n th
e s
ho
rt dura
tion o
f rock c
ove
r activ
ities, th
ere
is
only
like
ly to
be a
low
imp
act o
n c
eta
cea
ns a
sso
cia
ted
with
the n
ois
e g
enera
ted
(JN
CC
, 2
00
8).
6.4
.3
Tra
nsb
ou
nd
ary
an
d C
um
ula
tive
Imp
acts
Ch
an
ge
s in
so
un
d c
hara
cte
ristic
s w
ith d
ista
nce
gen
era
lly re
sult in
exp
osu
res b
eco
min
g le
ss
physio
log
ica
lly d
am
ag
ing
with
incre
asin
g d
ista
nce
, alth
oug
h s
oun
d c
an h
ave
imp
acts
ove
r lo
ng
er
dis
tance
s,
the
mo
st
like
ly
recep
tors
be
ing
m
arin
e
ma
mm
als
a
nd
fis
h.
Ma
rine
m
am
ma
ls a
nd fis
h in
the a
rea
are
like
ly to
be h
ab
ituate
d to
som
e b
ackg
roun
d n
ois
e a
lread
y
due
to e
xis
ting
oil a
nd
ga
s in
sta
llatio
ns a
nd
the p
rese
nce o
f ve
ssels
and
there
fore
effe
cts
fro
m th
e n
ois
e e
mitte
d fro
m th
e a
dd
itiona
l deco
mm
issio
nin
g v
essels
and
the c
uttin
g o
r rock
pla
cem
ent a
ctiv
ities a
t the
se
ab
ed
are
not e
xp
ecte
d.
Bla
ckb
ird a
nd E
ttrick D
eco
mm
issio
nin
g E
IA
Do
cu
me
nt N
o. E
TR
K0
00
1-G
E-O
000-L
C-R
PT
-0006
No
ve
mb
er 2
016
P
ag
e 8
0 o
f 109
As d
iscu
ssed
in S
ectio
n 4
.1.3
, there
are
exis
ting
oil a
nd
ga
s a
ssets
locate
d w
ithin
20 k
m o
f th
e E
&B
deve
lopm
ents
. He
nce
there
is a
pote
ntia
l for c
um
ula
tive
nois
e im
pact d
ue
to v
essel
ope
ratio
ns s
upp
ortin
g th
e p
rop
osed
activ
ities a
nd
those
su
pp
ortin
g o
ther in
sta
llatio
ns in
the
are
a. H
ow
eve
r, the n
um
ber o
f ve
ssels
antic
ipate
d to
be p
resent in
the a
rea d
ue
to th
ese
a
ssets
is
sm
all.
Ove
rall
the a
dd
itiona
l n
ois
e du
e to
d
ecom
mis
sio
nin
g is
e
xp
ecte
d to
b
e
localis
ed a
nd
rela
tive
ly s
hort te
rm a
nd
there
fore
no s
ign
ifica
nt tra
nsb
ou
nd
ary
or c
um
ula
tive
im
pacts
are
a e
xp
ecte
d.
6.4
.4
Co
ntro
l an
d M
itigatio
n M
eas
ure
s
Th
e fo
llow
ing
co
ntro
l and m
itigatio
n m
easu
res h
ave
be
en id
en
tified fo
r impa
cts
from
nois
e:
· V
essel u
se w
ill be o
ptim
ise
d; a
nd
· C
uttin
g lo
catio
ns a
nd
pro
ce
dure
s id
en
tified in
ord
er to
min
imis
e n
um
ber a
nd
dura
tion
of o
pera
tion
s.
6.4
.5
Co
nc
lus
ion
Alth
ou
gh
there
are
marin
e m
am
ma
ls a
nd
fish
in th
e a
rea
aro
un
d th
e E
&B
field
, dis
turb
ance
from
nois
e re
sultin
g fro
m d
ecom
mis
sio
nin
g a
ctiv
ities is
exp
ecte
d to
be lo
w. T
he g
rea
test
pote
ntia
l dis
turb
an
ce is
as a
result o
f ve
ssels
usin
g D
P. H
ow
eve
r, giv
en th
at E
&B
are
in a
n
are
a o
f esta
blis
hed
oil a
nd
ga
s a
ctiv
ity, m
arin
e m
am
ma
ls a
re lik
ely
to b
e a
ccusto
me
d to
sim
ilarly
so
un
d le
ve
ls a
nd
this
redu
ces th
e s
eve
rity o
f imp
act.
6.5
W
aste
Man
ag
em
en
t an
d R
eso
urc
e U
se
6.5
.1
Re
gu
lato
ry R
eq
uire
men
ts
Th
e R
evis
ed W
aste
F
ram
ew
ork
D
irectiv
e (W
FD
) (D
irectiv
e 2
00
8/9
8/E
C)
wa
s a
do
pte
d in
D
ecem
ber 2
00
8, w
ith M
em
be
r Sta
tes b
ein
g re
quire
d to
imp
lem
ent re
vis
ions b
y D
ecem
ber
201
0.
Th
e
ove
rridin
g
aim
is
to
e
nsure
th
at
wa
ste
m
anag
em
ent
is
ca
rried
out
with
ou
t e
nd
an
gerin
g h
um
an h
ealth
and
with
ou
t harm
ing
the e
nviro
nm
ent. A
rticle
4 a
lso
sta
tes th
at
the w
aste
hie
rarc
hy s
hall b
e a
pp
lied a
s a
prio
rity o
rde
r in w
aste
pre
ve
ntio
n a
nd
ma
na
gem
ent
leg
isla
tion
an
d p
olic
y.
Waste
le
gis
latio
n
for
Sco
tlan
d
(Th
e
Waste
(S
co
tlan
d)
Reg
ula
tion
s
20
12
) co
ntro
ls
the
ge
nera
tion
, tra
nsp
orta
tion
and
d
isp
osa
l of
wa
ste
w
ithin
th
e
Eu
rop
ea
n
Un
ion
and
th
e
sh
ipm
en
t of
wa
ste
in
to
and
o
ut
of
the
EU
. It
co
ve
rs
co
ntro
lled
wa
ste
, du
ty
of
care
, re
gis
tratio
n o
f ca
rriers
an
d b
rokers
, wa
ste
ma
nag
em
ent lic
ensin
g, la
ndfill, h
aza
rdo
us w
aste
, p
rod
ucer re
spo
nsib
ility, p
ackag
ing
wa
ste
, end
-of-life
ve
hic
les, w
aste
ele
ctric
al a
nd
ele
ctro
nic
e
qu
ipm
ent (W
EE
E) a
nd th
e tra
ns-fro
ntie
r sh
ipm
ent o
f wa
ste
.
Wheth
er a
ma
teria
l or s
ubsta
nce
is d
ete
rmin
ed
as a
‘wa
ste
’ is d
ete
rmin
ed
und
er E
U la
w.
Th
e E
U W
FD
(200
6/1
2/E
C) d
efin
es w
aste
as:
“any s
ubsta
nce
or o
bje
ct in
the c
ate
go
ries s
et o
ut in
An
ne
x 1
of th
e D
irectiv
e w
hic
h th
e
hold
er d
isca
rds o
r inte
nds o
r is re
qu
ired to
dis
card
”.
Ma
teria
ls d
isp
ose
d o
f onsh
ore
mu
st c
om
ply
with
the re
leva
nt h
ea
lth a
nd
safe
ty, p
ollu
tion
p
reve
ntio
n, w
aste
req
uire
me
nts
and
rele
va
nt s
ectio
ns o
f the E
nviro
nm
en
tal P
rote
ctio
n A
ct
199
0. T
he w
aste
ma
nag
em
ent a
ssessm
ent s
hou
ld b
e b
ase
d o
n th
e w
ors
t ca
se s
ce
nario
and
fo
llow
th
e
hie
rarc
hy
sh
ow
n
in
Fig
ure
6-1
, in
lin
e
with
re
leva
nt
leg
isla
tion
, p
erm
its
and
co
nse
nts
.
Bla
ckb
ird a
nd E
ttrick D
eco
mm
issio
nin
g E
IA
Do
cu
me
nt N
o. E
TR
K0
00
1-G
E-O
000-L
C-R
PT
-0006
No
ve
mb
er 2
016
P
ag
e 8
1 o
f 109
Fig
ure
6-1
: Wa
ste
hie
rarc
hy.
Ma
na
ge
me
nt o
f radio
activ
e m
ate
rials
is g
ove
rne
d u
nd
er:
· R
adio
activ
e S
ubsta
nce
s A
ct 1
99
3;
· T
ran
s-fro
ntie
r Sh
ipm
ent o
f Ra
dio
activ
e W
aste
; and
· S
pen
t Fue
l Reg
ula
tion
s 2
00
8.
Th
e h
an
dlin
g a
nd
dis
posa
l of ra
dio
activ
e w
aste
req
uire
s a
dd
itiona
l auth
oris
atio
n. O
nw
ard
tra
nsp
orta
tion o
f wa
ste
or re
cycle
d m
ate
rials
mu
st a
lso b
e in
com
plia
nce
with
app
lica
ble
le
gis
latio
n, s
uch
as th
e C
arria
ge o
f Da
ng
ero
us G
ood
s a
nd U
se
of T
ransp
orta
ble
Pre
ssure
E
qu
ipm
ent
Reg
ula
tion
s 2
00
9,
a h
igh
ly p
rescrip
tive
re
gu
latio
n
go
ve
rnin
g th
e ca
rriag
e of
dan
gero
us g
ood
s b
y ro
ad
.
6.5
.2
Ac
tivitie
s (C
au
se o
f Imp
ac
t)
Th
e
wa
ste
g
ene
rate
d
as
a
part
of
the
pro
pose
d
deco
mm
issio
nin
g
activ
ities
will
be
a
co
mb
inatio
n o
f both
ha
za
rdo
us (s
pecia
l) and n
on-h
aza
rdo
us w
aste
s.
Th
e
inve
nto
ry
of
E&
B
mate
rials
a
nd
re-u
se,
recyclin
g
and
dis
posal
aim
s
of
ma
teria
l re
cove
red
to s
hore
are
pre
sen
ted in
Ta
ble
6-4
and
Ta
ble
6-5
.
Ta
ble
6-4
: Ettric
k a
nd
Bla
ckb
ird m
ate
rials
inve
nto
ry.
Stru
ctu
res
T
ota
l In
ve
nto
ry
(te)
Ste
el (te
) P
lastic
(te
)
No
n-
Fe
rrou
s
(te)
Co
nc
rete
(te
)
Ro
ck
co
ve
r (te
)
Oth
er
(te)
Ettric
k in
sta
llatio
ns
5,0
58
5
,00
8
3
25
0
0
23
Ettric
k p
ipe
lines
35,6
01
1
,55
8
315
3
961
3
2,6
27
136
Bla
ckb
ird
insta
llatio
ns
349
309
2
6
28
0
5
Bla
ckb
ird
pip
elin
es
45,9
11
1
,66
7
365
7
877
4
2,7
50
246
To
tal in
ve
nto
ry
86
,91
9
8,5
42
684
41
1
,86
6
75,3
77
410
Bla
ckb
ird a
nd E
ttrick D
eco
mm
issio
nin
g E
IA
Do
cu
me
nt N
o. E
TR
K0
00
1-G
E-O
000-L
C-R
PT
-0006
No
ve
mb
er 2
016
P
ag
e 8
2 o
f 109
Ta
ble
6-5
: Wa
ste
stre
am
man
ag
em
en
t pro
ce
sse
s.
Wa
ste
Stre
am
R
em
ov
al a
nd
Dis
po
sal M
eth
od
Bu
lk liq
uid
s
All
su
bse
a flo
wlin
e cle
anin
g ch
em
ica
ls a
nd
tre
ate
d flu
sh
w
ate
r w
as
re
turn
ed
to
th
e F
PS
O fo
r p
roce
ssin
g a
nd d
isch
arg
e in
lin
e w
ith th
e
exis
ting
p
rod
uctio
n
pe
rmits
. F
luid
s
rem
ain
ing
in
th
e
su
bse
a
infra
stru
ctu
re
will
be
dis
ch
arg
ed
o
n
rem
ova
l. S
lops
Ta
nks
we
re
dis
ch
arg
ed
in
p
ort,
at
wh
ich
p
oin
t th
e fin
al
tank cle
an
ing a
nd g
as-
freein
g a
ctiv
ities w
ere
co
mp
lete
d.
Marin
e g
row
th
Afte
r su
bm
ers
ion in
the N
orth
Se
a fo
r ove
r 6 y
ea
rs th
e ris
ers
, jum
pers
e
tc.
will
ha
ve
a
ccu
mu
late
d
a
co
atin
g
of
ma
rine
fo
ulin
g,
or
ma
rine
g
row
th. A
cco
rdin
g to
Tve
dte
n (2
00
1) (re
fere
nce
d in
BM
T C
ord
ah
, 201
1)
the w
ate
r co
nte
nt o
f ma
rine
gro
wth
is ty
pic
ally
70
– 9
0 %
of its
tota
l w
eig
ht. M
arin
e g
row
th s
tarts
to d
ry o
ut a
s s
oon
as it is
lifted o
ut o
f the
se
a a
nd
the
refo
re th
e w
eig
ht o
f ma
teria
l to b
e d
isp
ose
d o
f onsh
ore
will
dep
en
d
larg
ely
o
n
ho
w
mu
ch
d
rying
out
take
s
pla
ce
d
urin
g
transp
orta
tion
an
d if a
ny m
arin
e g
row
th w
ill fall o
ff the s
tructu
re in
to s
ea
d
urin
g tra
nsit.
Whe
re
pra
ctic
able
, m
arin
e
gro
wth
w
ill b
e
rem
ove
d
su
bse
a.
All
rem
ain
ing m
arin
e g
row
th w
ill be
rem
ove
d o
n th
e v
esse
l deck o
r at a
n
onsh
ore
dis
po
sa
l facility
, in a
cco
rda
nce
with
all a
pplic
ab
le g
uid
elin
es.
NO
RM
/LS
A s
ca
le
Whe
re
an
y
pro
du
ct
co
nta
inin
g,
or
su
sp
ecte
d
to
co
nta
in,
NO
RM
m
ate
rials
is
to
b
e
reco
ve
red
to
su
rface
, a
su
itab
le
mo
nito
ring
a
nd
co
nta
inm
ent re
gim
e w
ill be e
nfo
rce
d. A
ny ite
ms fo
un
d to
co
nta
in N
OR
M
durin
g re
co
ve
ry w
ill be c
on
tain
ed a
nd
se
ale
d a
nd
sh
ippe
d to
sh
ore
for
dis
posa
l und
er th
e a
pp
ropria
te p
erm
its b
y a N
exe
n a
pp
rove
d c
ontra
cto
r u
nd
er N
exe
n’s
an
d th
e c
ontra
cto
r’s m
ana
ge
me
nt s
yste
ms.
All N
OR
M c
onta
min
ate
d ite
ms w
ill be d
eco
nta
min
ate
d a
t an a
ppro
ve
d
facility
prio
r to d
isp
osa
l. All N
OR
M m
ate
rials
will b
e d
isp
ose
d o
f at a
su
itab
ly p
erm
itted
facility
.
Asb
esto
s
No
t ap
plic
ab
le.
Ha
za
rdo
us w
aste
s
An
y ha
za
rdo
us w
aste
s re
ma
inin
g in
the
reco
ve
red
infra
stru
ctu
re s
hall
be d
isp
ose
d o
f und
er a
pp
rop
riate
perm
it.
On
sh
ore
Dis
ma
ntlin
g
Site
s
All ite
ms o
f su
bse
a in
frastru
ctu
re re
mo
ve
d fro
m th
e s
eab
ed
sh
all b
e
ma
na
ge
d b
y a
wa
ste
ha
nd
ling c
om
pan
y o
nce
on
sh
ore
, with
dis
posa
l of
the d
eco
mm
issio
ne
d e
qu
ipm
ent c
om
ple
ted
at a
n a
pp
ropria
tely
lice
nse
d
wa
ste
ma
na
ge
me
nt fa
cility
(or c
om
bin
atio
n o
f facilitie
s).
Ove
rall, d
eco
mm
issio
nin
g p
uts
resou
rces b
ack in
to u
se th
roug
h re
-use o
f eq
uip
me
nt a
nd
re
cyclin
g
of
mate
rials
su
ch
as
ste
el.
Ho
we
ve
r, w
here
in
frastru
ctu
re
is
left
in
situ
(e
.g.
trench
ed
a
nd
b
urie
d
flow
lines
and
u
mb
ilica
ls)
this
m
ate
rial
is
effe
ctiv
ely
“lo
st”.
Th
is
is
accou
nte
d fo
r und
er e
mis
sio
ns (S
ectio
n 6
.1) w
hic
h a
ttribute
d 4
3 %
of th
e e
stim
ate
d e
nerg
y
usag
e a
nd
asso
cia
ted
em
issio
ns to
the m
anufa
ctu
re o
f new
ste
el to
repla
ce re
cycla
ble
ste
el
left in
situ
. Th
e fa
te o
f the
mate
rials
to b
e d
ecom
mis
sio
ne
d is
sh
ow
n in
Tab
le 6
-6.
Bla
ckb
ird a
nd E
ttrick D
eco
mm
issio
nin
g E
IA
Do
cu
me
nt N
o. E
TR
K0
00
1-G
E-O
000-L
C-R
PT
-0006
No
ve
mb
er 2
016
P
ag
e 8
3 o
f 109
Ta
ble
6-6
: Inve
nto
ry d
isp
os
ition
.
Stru
ctu
res
T
ota
l Inv
en
tory
(te)*
Pla
nn
ed
ton
na
ge
to
sh
ore
(te)
Pla
nn
ed
ton
na
ge
left
in s
itu (te
)*
Ettric
k in
sta
llatio
ns
5,0
58
4
,10
9
949
Ettric
k p
ipe
lines
2,9
74
1
,34
5
1,6
29
Bla
ckb
ird in
sta
llatio
ns
349
305
44
Bla
ckb
ird p
ipe
lines
3,1
61
1,0
35
2
,12
6
To
tal in
ve
nto
ry
11,5
42
6,7
94
4
,74
8
*Exclu
de
s ro
ck c
ove
r
6.5
.3
Imp
acts
on
Re
ce
pto
rs
Th
e
pote
ntia
l im
pacts
fro
m
wa
ste
d
isp
osa
l a
re
on
the
onsh
ore
e
nviro
nm
ent
and
a
re
prin
cip
ally
associa
ted
with
the p
ote
ntia
l imp
acts
of la
ndfills
, typ
ica
lly:
· U
se
of s
om
etim
es s
carc
e la
ndfill s
pace
(resourc
e u
se);
· D
eg
radatio
n o
f local/re
gio
na
l air q
uality
as a
result o
f onsh
ore
transp
ort;
· P
ote
ntia
l deg
radatio
n o
f the w
ate
r enviro
nm
ent if a
ny le
ach
ate
is p
roduce
d b
y th
e
land
fill site
and
reach
es s
urfa
ce w
ate
r and/o
r gro
und
wa
ter; a
nd
· N
uis
ance
to th
e lo
cal c
om
mu
nity
from
traffic
, odou
r and v
isu
al im
pacts
.
Where
mate
rials
are
recycle
d, im
pacts
will b
e a
sso
cia
ted
with
exis
ting
pro
cessin
g p
lants
:
· D
eg
radatio
n o
f local/re
gio
na
l air q
uality
as a
result o
f transp
ort;
· D
eg
radatio
n o
f local/re
gio
na
l air q
uality
as a
result o
f pla
nt e
mis
sio
ns;
· D
eg
radatio
n o
f the w
ate
r enviro
nm
ent (s
urfa
ce w
ate
r and
gro
un
dw
ate
r) asso
cia
ted
w
ith a
ny d
isch
arg
es fro
m p
roce
ssin
g p
lant; a
nd
· N
uis
ance
to th
e lo
cal c
om
mu
nity
from
traffic
and
vis
ual im
pacts
.
On
ly e
xis
ting
perm
itted fa
cilitie
s (u
nd
er th
e E
nviro
nm
enta
l Pe
rmittin
g re
gim
e (E
ng
land
) or
the P
ollu
tion
Pre
ve
ntio
n a
nd
Co
ntro
l reg
ime
(Sco
tlan
d)) w
ill be
used
. Fo
r those
perm
its to
h
ave
bee
n a
ppro
ve
d, th
e im
pacts
to a
ir, land
an
d w
ate
r to th
e lo
cal c
om
mu
nity
, will h
ave
a
lread
y b
ee
n a
ssesse
d a
s a
ccep
tab
le. T
here
fore
the u
se o
f exis
ting
perm
itted fa
cilitie
s fo
r re
cyclin
g o
r dis
posa
l is n
ot c
onsid
ere
d to
result in
a s
ign
ifica
nt e
nviro
nm
enta
l imp
act.
Ma
rine
gro
wth
will b
e d
ealt w
ith b
y th
e s
ele
cte
d y
ard
in lin
e w
ith a
ccep
ted
pra
ctic
es. T
his
n
orm
ally
invo
lve
s la
nd
filling
or c
om
postin
g. T
he m
ajo
r so
urc
es o
f sm
ell fo
llow
ing
rem
ova
l of
stru
ctu
res c
an b
e a
ssocia
ted
with
deg
radatio
n o
f ma
rine
gro
wth
. In re
ce
nt R
OV
su
rve
ys
limite
d m
arin
e g
row
th h
as b
ee
n id
en
tified o
n th
e in
frastru
ctu
re to
be re
move
d fro
m th
e E
&B
fie
lds a
nd
there
fore
odou
r is u
nlik
ely
to b
e a
n is
su
e. In
add
ition m
uch o
f the m
arin
e g
row
th
will b
e lo
st d
urin
g th
e c
uttin
g a
nd
lifting p
roce
ss a
nd d
urin
g tra
nsp
orta
tion
.
Bla
ckb
ird a
nd E
ttrick D
eco
mm
issio
nin
g E
IA
Do
cu
me
nt N
o. E
TR
K0
00
1-G
E-O
000-L
C-R
PT
-0006
No
ve
mb
er 2
016
P
ag
e 8
4 o
f 109
6.5
.4
Tra
nsb
ou
nd
ary
an
d C
um
ula
tive
Imp
acts
Th
e A
oka
Miz
u w
as s
aile
d to
Gd
an
sk in
Po
land
for e
ng
inee
ring
dow
n a
nd
all n
ece
ssary
p
erm
its fo
r transp
ortin
g o
f wa
ste
on b
oa
rd w
ere
in p
lace
prio
r to s
ail
aw
ay.
All s
ubse
a
infra
stru
ctu
re w
ill go
to th
e U
K.
6.5
.5
Co
ntro
l an
d M
itigatio
n M
eas
ure
s
Where
possib
le, m
ate
rials
will b
e re
cycle
d o
r so
ld a
nd
reuse
d. W
aste
ma
na
gem
ent o
ptio
ns
will ta
ke
acco
un
t of th
e w
aste
hie
rarc
hy (h
ttp://w
aste
hie
rarc
hy.w
rap.o
rg.u
k/) s
how
n in
Fig
ure
6-1
with
redu
ctio
n in
vo
lum
e o
f wa
ste
bein
g th
e p
refe
rred o
ptio
n. E
xis
ting
wa
ste
dis
posa
l ro
ute
s a
nd
con
tracto
rs w
ill be u
sed
wh
ere
po
ssib
le.
Se
gre
gatin
g m
ate
rials
at s
ourc
e a
nd
ma
inta
inin
g th
is s
epa
ratio
n b
etw
een
haza
rdo
us a
nd
non-h
aza
rdo
us
wa
ste
stre
am
s
will
redu
ce
the
am
ou
nt
of
mate
rial
req
uirin
g
treatm
ent
onsh
ore
. If
haza
rdo
us
wa
ste
is
p
rod
uced
it
will
be
pre
-treate
d
to
redu
ced
h
aza
rdou
s
pro
pe
rties o
r, wh
ere
po
ssib
le re
nd
er it n
on-h
aza
rdo
us.
NO
RM
co
nta
min
ate
d e
qu
ipm
en
t will b
e h
an
dle
d, tra
nsp
orte
d, s
tore
d a
nd
dis
pose
d o
f in a
co
ntro
lled m
ann
er. P
roto
cols
will b
e in
pla
ce to
ensu
re th
at e
qu
ipm
ent is
not re
lease
d o
r h
an
dle
d
with
ou
t co
ntro
ls
to
pro
tect
the
wo
rker
and
pre
ve
nt
co
nta
min
atio
n
of
the
enviro
nm
ent.
6.5
.6
Co
nc
lus
ion
All re
gu
lato
ry a
nd
co
mp
an
y p
roce
dure
s fo
r seg
reg
atio
n, tra
nsp
ort a
nd
dis
posa
l will b
e s
trictly
a
dh
ere
d to
a
nd
o
nly
fu
lly p
erm
itted fa
cilitie
s w
ill b
e u
sed
fo
r re
cyclin
g o
r d
isp
osa
l. T
he
resultin
g im
pacts
from
resou
rce
use a
nd
wa
ste
ma
nag
em
ent a
re th
ere
fore
exp
ecte
d to
be
low
.
6.6
A
cc
iden
tal E
ven
ts
6.6
.1
Ac
tivitie
s (C
au
se o
f Imp
ac
ts)
Th
e fo
llow
ing
d
eco
mm
issio
nin
g a
ctiv
ities h
ave
b
ee
n id
en
tified a
s h
avin
g th
e p
ote
ntia
l to
re
sult in
an a
ccid
enta
l rele
ase
of h
yd
roca
rbo
ns:
· W
ell b
low
out; a
nd
· V
essel c
ollis
ion re
sultin
g in
a s
pill o
f die
sel
Ea
ch w
ell
is fu
lly su
spe
nd
ed
w
ith tw
o p
rove
n b
arrie
rs to
th
e e
nviro
nm
ent
and
a
ll tre
e
stru
ctu
res a
re o
ve
rtraw
lable
. Th
ere
fore
, in te
rms o
f risk o
f a w
ell b
low
ou
t sca
le e
ve
nt, th
e
“like
lihoo
d” re
ma
ins lo
w, th
e s
am
e a
s u
nd
er n
orm
al o
pe
ratin
g c
ond
itions. In
add
ition, th
e
reserv
oirs
are
dep
lete
d, e
ach
we
ll has b
ee
n b
ullh
ead
ed
to p
ush
hyd
roca
rbo
n a
wa
y fro
m th
e
we
llbore
and
back in
to th
e re
serv
oir, a
nd n
o lift fo
rce
is b
ein
g a
pp
lied s
o th
e w
ells
are
not
und
er p
ressu
re. A
s a
resu
lt, the “c
onseq
uen
ce” o
f a la
rge s
ca
le re
lease
, in te
rms o
f vo
lum
e
and
rate
from
the w
ells
, is g
rea
tly re
du
ced
com
pare
d to
norm
al o
pera
tion
s w
hic
h lo
we
rs th
e
ove
rall ris
k. F
or th
e p
urp
ose
s o
f this
EIA
it is re
alis
tic to
assu
me th
at in
the e
ve
nt o
f a w
ors
t ca
se s
ce
na
rio, w
here
for e
xa
mp
le a
Xm
as T
ree
is rip
pe
d o
ff and
the c
om
ple
tion
tubin
g a
nd
Su
b S
urfa
ce S
afe
ty V
alv
e a
re d
am
ag
ed a
nd
lo
se in
teg
rity,
un
co
nstra
ined
flo
wra
tes,
as
decla
red
in th
e O
PE
P, w
ou
ld n
ot o
ccur o
r pers
ist. T
he v
olu
me
s o
f hyd
rocarb
on
s re
lease
d
from
any o
f the w
ells
durin
g P
&A
activ
ities is
there
fore
co
nsid
ere
d to
be m
inim
al.
Bla
ckb
ird a
nd E
ttrick D
eco
mm
issio
nin
g E
IA
Do
cu
me
nt N
o. E
TR
K0
00
1-G
E-O
000-L
C-R
PT
-0006
No
ve
mb
er 2
016
P
ag
e 8
5 o
f 109
No
mo
de
lling
sp
ecific
to th
e d
eco
mm
issio
nin
g w
ork
has b
ee
n c
arrie
d o
ut b
ut th
e s
ce
na
rios
giv
en in
the O
PE
P fo
r the
E&
B fie
lds h
ave
bee
n u
sed
to d
ete
rmin
e th
e lik
ely
beh
avio
ur o
f oil
and
die
sel fo
llow
ing
a s
pill. It s
hou
ld b
e n
ote
d th
at th
e w
ell b
low
out m
ode
lled in
the O
PE
P
(Ne
xe
n, 2
01
6b) is
co
nsid
era
bly
larg
er th
an a
nyth
ing
that w
ould
be e
xp
ecte
d a
t this
sta
ge
of
field
life.
Th
e
OP
EP
(N
exe
n,
20
16
b)
inclu
de
s
Oil
Sp
ill C
ontin
ge
ncy
and
R
espo
nse
(O
SC
AR
) m
ode
lling
for th
e fo
llow
ing
wo
rst c
ase s
ce
nario
s:
1.
Well b
low
out re
su
lting in
loss o
f 12,4
39 m
3 of c
rude
ove
r a 1
20 d
ay p
erio
d; a
nd
2.
Ve
ssel c
ollis
ion re
sultin
g in
loss o
f 3,5
50
m3 o
f die
sel o
ve
r a 1
hou
r rele
ase
pe
riod.
Ettric
k a
nd
Bla
ckb
ird c
rud
e h
ave
sim
ilar p
rop
ertie
s. In
the
eve
nt o
f a s
pill to
se
a, th
e c
rude
w
ill rem
ain
aflo
at o
n th
e s
ea s
urfa
ce. T
he c
rude h
as a
wa
x c
onte
nt o
f app
roxim
ate
ly 6
%
wh
ich
indic
ate
s th
e c
rude
will b
e h
igh
ly v
icio
us a
nd
pers
iste
nt. W
ea
therin
g m
ode
ls o
n E
ttrick
cru
de
sug
ge
st th
at th
e c
rude
will ra
pid
ly lo
se a
ppro
xim
ate
ly 3
2.3
% v
olu
me
from
the s
ea
su
rface b
y e
va
po
ratio
n w
ithin
the firs
t few
ho
urs
of a
sp
ill at s
ea. A
tota
l of 4
5.6
% v
olu
me
will e
ve
ntu
ally
be lo
st b
y e
va
po
ratio
n o
ve
r the fo
llow
ing
24 - 4
8 h
ours
.
Die
sel
has
ve
ry
hig
h
leve
ls
of
light
hyd
roca
rbo
ns
and
th
ere
fore
e
va
po
rate
s q
uic
kly
o
n
rele
ase
. Th
e lo
w a
sph
alte
ne
co
nte
nt p
reve
nts
em
uls
ifica
tion
redu
cin
g its
pers
iste
nce
in th
e
enviro
nm
ent.
Sto
cha
stic
m
ode
lling
(takin
g
into
a
ccou
nt
pre
va
iling
w
eath
er
co
nd
ition
s
to
dete
rmin
e
a
pro
ba
bility
of s
urfa
ce o
iling
) of S
ce
na
rio 1
indic
ate
s p
ote
ntia
l are
as o
f bea
chin
g o
ccurrin
g
alo
ng
the U
K c
oast. T
he h
igh
est p
roba
bility
of b
each
ing
is in
the G
ram
pia
n re
gio
n, ra
ng
ing
fro
m 7
0-8
0 %
pro
ba
bility
(from
De
cem
ber to
Feb
ruary
) to 3
0-4
0 %
pro
ba
bility
(from
Ma
rch
to
Au
gu
st). T
he
time
until in
itial b
ea
chin
g in
Gra
mp
ian is
from
two
to fo
ur d
ays. B
each
ing
is
als
o p
red
icte
d o
n th
e c
oa
sts
of n
eig
hbo
urin
g m
em
ber s
tate
s, w
ith a
ma
xim
um
pro
ba
bility
of
bea
chin
g o
f 20-3
0 %
on th
e c
oast o
f No
rwa
y m
ore
than 3
0 d
ays a
fter re
lease
.
Sto
cha
stic
mo
de
lling
of th
e w
ors
t ca
se d
iesel s
pill (S
ce
na
rio 2
) indic
ate
s th
at th
e d
iesel h
as
a p
rob
ability
of 1
to 1
0 %
of b
ea
chin
g in
the G
ram
pia
n re
gio
n d
ep
en
din
g o
n th
e s
easo
n. N
o
bea
chin
g is
pre
dic
ted in
any o
the
r me
mb
er s
tate
. Th
ere
is a
1 %
to 5
% p
rob
ability
of th
e
die
sel c
rossin
g th
e U
K/N
orw
ay m
edia
n lin
e in
Ju
ne
to A
ug
ust. T
he m
ode
lling
sh
ow
s th
e
die
sel ta
kin
g 7
to 1
0 d
ays to
reach th
e m
edia
n lin
e fo
llow
ing
rele
ase
.
Giv
en th
at
the siz
e of
the p
ote
ntia
l w
ors
t ca
se
sp
ill u
nd
er
cu
rrent
con
ditio
ns w
ould
b
e
co
nsid
era
bly
less th
an
for th
e w
ell b
low
out s
ce
na
rio th
e e
xte
nt o
f surfa
ce
oilin
g w
ould
als
o
be c
onsid
era
bly
redu
ced.
6.6
.2
Imp
acts
on
Re
ce
pto
rs
A la
rge
sca
le s
pill o
f hyd
roca
rbo
ns c
ould
imp
act a
ll parts
of th
e m
arin
e e
cosyste
m a
nd
affe
ct
oth
er u
sers
of th
e s
ea. F
ish
, ma
rine
mam
ma
ls a
nd
se
ab
irds a
re th
e m
ost lik
ely
gro
up
s to
be
imp
acte
d. T
he s
eve
rity o
f the im
pact w
ould
de
pen
d o
n th
e v
arie
ty a
nd
nu
mb
ers
of v
uln
era
ble
sp
ecie
s p
rese
nt a
t the tim
e o
f the re
lease
and
durin
g th
e p
rese
nce
of th
e h
yd
roca
rbo
n o
n th
e
se
a w
ate
r surfa
ce.
Se
ab
irds a
re vu
lnera
ble
to
hyd
roca
rbo
n s
urfa
ce p
ollu
tion
w
hic
h c
an ca
use d
irect
toxic
ity
thro
ug
h in
ge
stio
n o
r hyp
oth
erm
ia d
ue
to th
e lo
ss o
f ability
to m
ain
tain
wa
terp
roof fe
ath
ers
. S
eab
irds a
re m
ost v
uln
era
ble
durin
g th
e m
oultin
g s
easo
n w
hen
they b
eco
me
fligh
tless a
nd
sp
en
d la
rge
am
ou
nts
of tim
e o
n th
e w
ate
r su
rface
, and
follo
win
g th
e e
nd
of th
e b
ree
din
g
se
aso
n, w
hen
ce
rtain
bird
s (n
ota
bly
auks) d
isp
ers
e a
wa
y fro
m c
oasta
l bre
edin
g c
olo
nie
s a
nd
a
re fo
un
d in
hig
h n
um
bers
offs
hore
. As n
ote
d in
Se
ctio
n 3
.3.5
, ann
ua
l sea
bird
vu
lnera
bility
is
co
nsid
ere
d to
be h
igh o
ve
rall w
ithin
the E
&B
field
s.
Bla
ckb
ird a
nd E
ttrick D
eco
mm
issio
nin
g E
IA
Do
cu
me
nt N
o. E
TR
K0
00
1-G
E-O
000-L
C-R
PT
-0006
No
ve
mb
er 2
016
P
ag
e 8
6 o
f 109
Ce
tace
ans a
re g
ene
rally
ve
ry m
obile
, redu
cin
g th
eir v
uln
era
bility
to c
onta
min
atio
n a
lthoug
h
dis
ruptio
n to
their s
ocia
l functio
ns o
f ca
re a
nd
repro
du
ctio
n m
ay o
ccur. D
ensitie
s o
f ceta
cea
n
in th
e vic
inity
o
f th
e E
&B
fie
lds va
ry b
y sp
ecie
s b
ut
are
m
ost
freq
uen
tly sig
hte
d in
th
e
su
mm
er
mo
nth
s
(se
e
Se
ctio
n
3.3
.4).
De
nsitie
s
of
wh
ite-b
ea
ke
d
dolp
hin
a
nd
h
arb
ou
r p
orp
ois
e a
pp
ea
r to b
e re
lativ
ely
hig
h in
the s
um
me
r mo
nth
s.
Fis
h s
paw
nin
g (in
clu
din
g w
hitin
g, le
mo
n s
ole
and N
orw
ay p
ou
t) occurs
thro
ug
hou
t the y
ear
with
pea
ks in
the s
prin
g a
nd
su
mm
er m
onth
s w
ithin
the E
&B
are
a. T
hese s
paw
nin
g g
roun
ds
form
a re
lativ
ely
sm
all p
art o
f ve
ry e
xte
nsiv
e s
pa
wn
ing
gro
un
ds fo
un
d w
ithin
the N
orth
Se
a
(Se
ctio
n 3
.3.3
). Fis
hin
g a
ctiv
ity w
ithin
the a
rea is
co
nsid
ere
d lo
w to
mo
de
rate
(Se
ctio
n 4
.1.2
).
An
y p
artitio
nin
g o
f die
sel o
r cru
de o
il into
the s
edim
ent c
ould
imp
act b
en
thic
org
anis
ms b
ut is
lik
ely
to b
e v
ery
limite
d a
s th
e b
ulk
of it w
ill eva
pora
te a
nd
dis
pers
e w
ithou
t reach
ing
the
se
ab
ed
(d
ep
ths of
110 m
). T
he am
oun
t th
at
rem
ain
s in
th
e se
dim
ent
dep
en
ds o
n th
e
se
dim
ent ty
pe, w
ith m
ore
partitio
nin
g to
silty
se
dim
ents
co
mpa
red
to s
and
y s
edim
ents
. The
se
ab
ed
aro
un
d E
&B
field
s is
pre
do
min
antly
sa
nd
y a
nd
there
fore
less lik
ely
to re
tain
oil.
An
y s
ign
ifica
nt s
pill o
f oil is
like
ly to
imp
act o
n b
oth
offs
hore
and
onsh
ore
pro
tecte
d s
ites.
Th
e
nea
rest
onsh
ore
pro
tecte
d
site
is
th
e
Buch
an
N
ess
to
Co
lliesto
n
Co
ast
Sp
ecia
l P
rote
ctio
n A
rea, w
hic
h is
c.7
0 k
m s
outh
we
st o
f the
deve
lopm
ents
and
is o
f imp
orta
nce
as a
n
estin
g a
rea fo
r a n
um
be
r of s
eab
ird s
pecie
s (g
ulls
and
auks). T
hese
bird
s fe
ed
outs
ide th
e
SP
A in
the n
ea
rby w
ate
rs, a
s w
ell a
s m
ore
dis
tan
tly a
nd
wo
uld
there
fore
be im
pacte
d b
y a
w
ell b
low
out.
Th
e n
ea
rest N
atu
re C
onse
rva
tion
Ma
rine
Pro
tecte
d A
rea to
the E
&B
deve
lopm
ents
is T
urb
ot
Ba
nk c
.40 k
m s
outh
of B
lock 2
0/2
. Th
e T
urb
ot B
an
k N
CM
PA
is lo
cate
d o
ff the e
ast c
oast o
f S
co
tlan
d, a
nd
lies w
ithin
an a
rea
of s
and
y s
edim
ent. It in
clu
de
s p
art o
f the s
helf b
ank a
nd
mo
un
d k
now
n a
s ‘T
urb
ot B
ank’, a
n a
rea
of im
porta
nce
for s
and
ee
ls w
here
they liv
e b
urie
d in
th
e s
and fo
r mo
nth
s a
t a tim
e.
Giv
en th
e lo
w lik
elih
oo
d o
f the re
lease
of a
larg
e v
olu
me
of d
iesel a
nd
the
sh
ort d
ura
tion
the
die
sel
is
pre
dic
ted
to
rem
ain
o
n
the
surfa
ce
co
mb
ined
w
ith
the
mitig
atio
n
and
co
ntro
l m
easu
res in
p
lace,
the sig
nific
ance of
the im
pa
ct
on surfa
ce
a
nd
n
ear-s
urfa
ce d
we
lling
ecosyste
ms a
nd
sp
ecie
s h
as b
ee
n a
ssesse
d a
s lo
w.
A w
ell b
low
out o
f the s
ize
mo
de
lled in
the O
PE
P is
co
nsid
ere
d re
mote
, there
fore
alth
oug
h
the c
onseq
uen
ce w
ould
be c
lassed
as M
ajo
r, the
ove
rall ris
k is
dete
rmin
ed
to b
e lo
w (s
ee
Ta
ble
5-1
). An a
ccid
en
tal s
pill o
f die
sel is
co
nsid
ere
d to
be o
f low
risk.
6.6
.3
Tra
nsb
ou
nd
ary
an
d C
um
ula
tive Im
pacts
A p
ote
ntia
l die
sel s
pill w
ould
be re
lativ
ely
unlik
ely
to c
ross th
e U
K / N
orw
eg
ian m
edia
n lin
e
(up to
10 %
pro
ba
bility
) and
there
fore
transb
ou
nd
ary
imp
acts
are
not e
xp
ecte
d fro
m a
die
sel
sp
ill.
In th
e u
nlik
ely
e
ve
nt
of
a m
ajo
r o
il sp
ill th
ere
is
th
e p
ote
ntia
l fo
r o
il to
cro
ss th
e U
K /
No
rwe
gia
n m
edia
n lin
e. O
ve
rall, h
ow
eve
r, the ris
k to
the e
nviro
nm
ent is
co
nsid
ere
d to
be lo
w
(se
e p
revio
us s
ectio
n) g
ive
n th
e v
ery
low
like
lihoo
d o
f su
ch a
n e
ve
nt o
ccu
rring.
6.6
.4
Co
ntro
l an
d M
itigatio
n M
eas
ure
s
Ne
xe
n h
as w
ell d
eve
lop
ed p
roce
dura
l co
ntro
ls in
pla
ce to
min
imis
e th
e lik
elih
oo
d o
f rele
ases
and
to m
itiga
te th
e im
pa
cts
of re
lease
s s
hou
ld th
ey o
ccur, a
s s
et o
ut in
the E
ttrick a
rea
OP
EP
(Ne
xe
n, 2
01
6b
). Ne
xe
n h
ave
a c
on
tract w
ith O
il Sp
ill Re
spo
nse
Lim
ited (O
SR
L). T
hey
wo
uld
b
e m
obilis
ed in
th
e e
ve
nt
of
a la
rge
r sp
ill in
o
rde
r to
p
rovid
e tra
ined
p
ers
onne
l, e
qu
ipm
ent a
nd a
dd
itional lo
gis
tics.
Bla
ckb
ird a
nd E
ttrick D
eco
mm
issio
nin
g E
IA
Do
cu
me
nt N
o. E
TR
K0
00
1-G
E-O
000-L
C-R
PT
-0006
No
ve
mb
er 2
016
P
ag
e 8
7 o
f 109
Th
e O
PE
P a
lso
se
ts o
ut th
e re
qu
irem
ents
for s
taff c
om
pete
ncy a
nd
train
ing
. Em
erg
ency
Co
ntro
l Exe
rcis
es a
re c
on
du
cte
d e
ve
ry th
ree y
ears
.
Ea
ch
ve
ssel
used
d
urin
g
decom
mis
sio
nin
g
will
ha
ve
its
o
wn
S
hip
bo
ard
O
il P
ollu
tion
E
me
rge
ncy P
lan (S
OP
EP
) deve
lope
d w
ithin
the re
qu
irem
ents
of R
eg
ula
tion 3
7 o
f MA
RP
OL
A
nne
x 1
(MA
RP
OL
, 1973
). On
ly v
essels
wh
ich
me
et N
exe
n’s
assura
nce
sta
nd
ard
s w
ill be
u
sed
and
all v
esse
ls w
ill be a
sse
ssed p
rior to
the s
tart o
f the c
ontra
ct. R
isks a
sso
cia
ted
with
sim
ulta
ne
ou
s o
pera
tion
s w
ill be a
ssesse
d b
efo
re th
e d
ecom
mis
sio
nin
g a
ctiv
ities a
re c
arrie
d
out.
6.6
.5
Co
nc
lus
ion
s
Th
e m
easure
s th
at a
re in
pla
ce
in th
e E
&B
field
s a
re c
onsid
ere
d e
ffectiv
e in
min
imis
ing th
e
risk o
f a la
rge
oil re
lease
durin
g d
ecom
mis
sio
nin
g a
ctiv
ities to
AL
AR
P.
6.7
S
ocio
-Eco
no
mic
Imp
acts
6.7
.1
Ac
tivitie
s (C
au
se o
f Imp
ac
ts)
Th
e p
ote
ntia
l so
urc
es o
f imp
act o
n s
ocio
-econ
om
ic a
ctiv
ities a
re:
· T
he u
se o
f ve
ssels
for th
e d
eco
mm
issio
nin
g a
ctiv
ities;
· H
and
ling
and
treatm
ent o
f wa
ste
onsh
ore
; and
· T
he re
qu
irem
ent fo
r leg
acy s
urv
eys.
6.7
.2
Imp
acts
on
Re
ce
pto
rs
Th
e s
ocio
-eco
no
mic
rece
pto
rs w
hic
h c
ould
be im
pacte
d a
s a
result o
f the d
eco
mm
issio
nin
g
ope
ratio
ns a
re:
· E
mp
loym
ent;
· C
om
mu
nitie
s lo
cal to
onsh
ore
site
s;
· C
om
merc
ial fis
hin
g; a
nd
· S
hip
pin
g.
Du
ring
th
e
va
riou
s
pha
ses
of
deco
mm
issio
nin
g,
sp
ecia
list
exp
ertis
e
will
be
req
uire
d,
partic
ula
rly fro
m th
e e
ng
inee
ring
secto
r, and
wo
rk w
ill be c
reate
d b
oth
with
in N
exe
n a
nd
co
ntra
cto
r org
anis
atio
ns. In
add
ition, th
e re
qu
irem
ent fo
r add
itiona
l ve
sse
ls to
su
pp
ort th
e
deco
mm
issio
nin
g a
ctiv
ities w
ill boo
st e
mp
loym
ent a
s w
ill the c
lean
ing, e
ng
inee
ring
dow
n a
nd
recyclin
g o
f any ite
ms re
turn
ed to
sh
ore
. Th
ese jo
bs a
re re
lativ
ely
sh
ort te
rm, c
om
pare
d to
th
e jo
bs lo
st fro
m o
pera
tion o
f the E
&B
field
s, th
ere
fore
there
is a
sm
all n
eg
ativ
e im
pact o
n
em
plo
ym
ent o
ve
rall.
Cle
an
ing
, eng
inee
ring
do
wn
and
dis
ma
ntlin
g o
f the s
tructu
res w
hen
bro
ug
ht o
nsh
ore
have
the p
ote
ntia
l to c
ause
dis
turb
an
ce to
the lo
cal c
om
mu
nity
. Su
ch d
istu
rba
nce
co
uld
take
the
form
of
incre
ase
d n
ois
e a
nd
vib
ratio
n,
odo
ur,
light,
dust,
ga
seo
us em
issio
ns a
nd
vis
ua
l d
istu
rba
nce. H
ow
eve
r, as th
e fa
cilitie
s b
ein
g c
on
sid
ere
d fo
r the w
ork
reg
ula
rly u
nd
erta
ke
wo
rk o
f this
kin
d, th
e o
nsh
ore
activ
ities a
ssocia
ted
with
deco
mm
issio
nin
g o
f the E
&B
field
s
are
unlik
ely
to re
pre
sent a
n in
cre
ase in
cu
rrent im
pacts
to th
e c
om
mu
nity
.
Th
e p
ote
ntia
l so
cio
-econo
mic
imp
acts
on c
om
merc
ial fis
hin
g in
the a
rea in
clu
de
the p
hysic
al
pre
se
nce o
f the d
ecom
mis
sio
nin
g v
essels
ca
usin
g p
ote
ntia
l inte
rfere
nce to
fish
ing a
ctiv
ities
Bla
ckb
ird a
nd E
ttrick D
eco
mm
issio
nin
g E
IA
Do
cu
me
nt N
o. E
TR
K0
00
1-G
E-O
000-L
C-R
PT
-0006
No
ve
mb
er 2
016
P
ag
e 8
8 o
f 109
and
dam
ag
e to
or lo
ss o
f ge
ar a
s a
resu
lt of s
ubse
a o
bstru
ctio
ns le
ft in s
itu, p
osin
g p
ote
ntia
l sn
ag
gin
g ris
ks.
Du
ring
the d
ecom
mis
sio
nin
g p
roje
ct, th
ere
will b
e p
ote
ntia
l for n
avig
atio
nal c
onflic
ts b
etw
een
fis
hin
g v
essels
and
deco
mm
issio
nin
g v
essels
transitin
g to
and
from
the
site
wh
ich
co
uld
re
sult in
fish
ing
ve
ssels
havin
g to
alte
r their to
win
g d
irectio
n. N
exe
n w
ill co
ntin
ue
to lia
ise
with
the S
FF
. As m
any o
f the d
ecom
mis
sio
nin
g a
ctiv
ities id
en
tified w
ill take
pla
ce w
ithin
e
xis
ting
500
m e
xclu
sio
n z
one
s (a
rou
nd E
&B
) an
d g
ive
n th
e s
hort d
ura
tion o
f the p
lann
ed
a
ctiv
ities, th
e u
se o
f appro
pria
te n
avig
atio
nal lig
hts
and
wa
rnin
g s
yste
ms a
nd
the c
ontin
ue
d
co
mm
unic
atio
n w
ith S
FF
, the im
pact o
n c
om
me
rcia
l fish
erie
s is
con
sid
ere
d lo
w.
On
ce d
ecom
mis
sio
nin
g h
as b
ee
n c
om
ple
ted, th
ere
is th
e p
ote
ntia
l for fis
hin
g g
ear to
sn
ag
on s
ubse
a o
bstru
ctio
ns w
hic
h h
ave
bee
n le
ft in s
itu. T
he S
FF
we
re in
vo
lve
d in
the o
ptio
ns
scre
en
ing
and
co
mp
ara
tive
assessm
ent p
rocess a
nd
deco
mm
issio
nin
g o
ptio
ns h
ave
bee
n
se
lecte
d to
take
their v
iew
s in
to a
ccou
nt. W
here
trench
ed
pip
elin
es a
re b
ein
g le
ft in s
itu ro
ck
co
ve
r w
ill b
e
used
a
t th
e
pip
elin
e
end
s
to
redu
ce
sn
ag
gin
g
haza
rd.
Re
cove
ry
of
all
ma
ttresse
s is
the b
ase
ca
se fo
r the d
eco
mm
issio
nin
g w
ork
s.
Follo
win
g co
mp
letio
n o
f th
e d
eco
mm
issio
nin
g a
ctiv
ities,
Ne
xe
n w
ill co
mm
issio
n a
d
eb
ris
cle
ara
nce
sw
eep
usin
g s
pecia
lly d
esig
ned
traw
ling
eq
uip
me
nt. A
ny d
eb
ris re
trieve
d w
ill be
retu
rned
to s
hore
for re
cyclin
g/d
isp
osa
l. Follo
win
g th
is re
me
dia
l wo
rk, th
e a
rea
will th
en
be
traw
led w
ith fis
hin
g g
ear re
leva
nt to
the a
rea
to e
nsure
no s
nag
haza
rds re
ma
in. T
he re
sults
of th
e s
we
ep
s a
nd
a c
op
y o
f the S
eab
ed
Cle
ara
nce
Ce
rtificate
issu
ed b
y th
e v
erifie
r will b
e
su
bm
itted to
BE
IS a
long
with
the D
ecom
mis
sio
nin
g C
loseo
ut R
eport.
Follo
win
g d
eco
mm
issio
nin
g, th
e 5
00
m e
xclu
sio
n z
one
s a
rou
nd th
e D
TB
and
the E
&B
drill
ce
ntre
s, w
ill be re
linq
uis
hed
an
d th
e a
rea w
ill be m
ade
ava
ilable
for fis
hin
g.
As m
ost o
f the d
eco
mm
issio
nin
g a
ctiv
ities w
ill be
ca
rried o
ut w
ithin
exis
ting
exclu
sio
n z
one
s,
the p
ote
ntia
l imp
acts
of th
e d
eco
mm
issio
nin
g v
essels
on e
xis
ting s
hip
pin
g is
co
nsid
ere
d lo
w.
6.7
.3
Tra
nsb
ou
nd
ary
an
d C
um
ula
tive
Imp
acts
No
tra
nsb
ou
nd
ary
im
pacts
o
n sh
ippin
g,
fish
ing
o
r e
mp
loym
ent
are
lik
ely
g
ive
n th
at
the
UK
/No
rwa
y m
edia
n lin
e is
c 1
42 k
m a
wa
y fro
m th
e E
&B
field
s. T
he c
um
ula
tive
imp
act o
f ve
ssels
from
decom
mis
sio
nin
g a
ctiv
ities w
ith th
e e
xis
ting
oil a
nd
ga
s a
ssets
in th
e a
rea
is
co
nsid
ere
d lo
w g
ive
n th
e re
lativ
ely
low
leve
ls o
f sh
ippin
g a
nd
fish
ing e
ffort in
the v
icin
ity.
6.7
.4
Co
ntro
l an
d M
itigatio
n M
eas
ure
s
Th
e k
ey m
itiga
tion
in re
latio
n to
min
imis
ing
impa
cts
on fis
hin
g is
thro
ug
h th
e s
ele
ctio
n o
f a
pp
rop
riate
de
com
mis
sio
nin
g o
ptio
ns fo
r all s
eab
ed
infra
stru
ctu
re. T
his
wa
s u
nd
erta
ken
in
co
nsu
ltatio
n
with
S
FF
a
nd
N
exe
n
will
co
ntin
ue
to
co
nsu
lt w
ith
SF
F
thro
ug
ho
ut
the
deco
mm
issio
nin
g w
ork
s. O
ve
r-traw
lable
stu
die
s w
ill be u
nd
erta
ke
n to
ch
eck fo
r any p
ote
ntia
l sn
ag
gin
g h
aza
rds.
6.7
.5
Co
nc
lusio
n
Ove
rall
so
cio
-econ
om
ic im
pacts
in
rela
tion
to
sh
ippin
g, fis
hin
g a
nd
em
plo
ym
ent
resultin
g
from
the d
ecom
mis
sio
nin
g a
ctiv
ities a
re c
onsid
ere
d to
be lo
w.
Bla
ckb
ird a
nd E
ttrick D
eco
mm
issio
nin
g E
IA
Do
cu
me
nt N
o. E
TR
K0
00
1-G
E-O
000-L
C-R
PT
-0006
No
ve
mb
er 2
016
P
ag
e 8
9 o
f 109
C
ON
CL
US
ION
S
7.0
Th
e E
IA p
rocess p
resente
d in
this
docu
me
nt c
on
sid
ers
the im
pact o
f the
pla
nn
ed
activ
ities
associa
ted
w
ith th
e d
eco
mm
issio
nin
g of
the E
&B
fie
lds.
Th
e im
pact
wa
s d
ete
rmin
ed
b
y
co
nsid
erin
g th
e d
ura
tion/fre
qu
en
cy o
f each
of th
e p
lann
ed
activ
ities a
nd
en
viro
nm
enta
l/so
cia
l b
ase
line to
dete
rmin
e th
e o
ve
rall le
ve
l of im
pact a
s e
ither lo
w, m
ediu
m o
r hig
h. A
ll pla
nn
ed
e
ve
nts
we
re c
onsid
ere
d to
be
of lo
w im
pact.
Ne
xe
n w
ill follo
w ro
utin
e e
nviro
nm
enta
l ma
na
ge
me
nt a
ctiv
ities in
clu
din
g c
ontra
cto
r ve
ssel
assessm
ents
a
nd le
ga
l re
qu
irem
ents
to
re
po
rt d
isch
arg
es a
nd
em
issio
ns,
su
ch th
at
the
enviro
nm
enta
l imp
act o
f the d
eco
mm
issio
nin
g a
ctiv
ities w
ill be m
inim
ise
d. F
ollo
win
g th
e E
IA
pro
ce
ss it c
an b
e c
onclu
ded
that a
ctiv
ities a
ssocia
ted
with
the d
eco
mm
issio
nin
g o
f the E
&B
fie
lds a
re u
nlik
ely
to s
ign
ifica
ntly
imp
act th
e e
nviro
nm
ent o
r oth
er s
ea u
se
rs p
rovid
ed
that th
e
pro
po
sed
mitig
atio
n a
nd c
ontro
l me
asure
s a
re p
ut in
pla
ce.
7.1
E
nerg
y U
se a
nd
Atm
osp
he
ric E
mis
sio
ns
Th
e p
rincip
al e
ne
rgy u
se a
nd
ge
ne
ratio
n o
f em
issio
ns to
air lo
cal to
the E
&B
de
ve
lopm
ents
w
ill aris
e fro
m fu
el c
om
bu
stio
n fo
r pro
pu
lsio
n a
nd
pow
er g
ene
ratio
n b
y th
e v
essels
req
uire
d
for
the a
ctiv
ities.
Th
ese e
mis
sio
ns w
ill in
clu
de
co
mp
on
en
ts w
hic
h h
ave
th
e p
ote
ntia
l to
co
ntrib
ute
to g
loba
l wa
rmin
g, a
cid
rain
fall, d
ry d
epo
sitio
n o
f partic
ula
tes a
nd
pho
toch
em
ical
pollu
tion
o
r ca
use
im
pacts
o
n lo
cal
air
qu
ality
. It
is e
xp
ecte
d th
at
imp
acts
w
ill b
e
low
sig
nific
ance a
s th
ey w
ill be s
hort te
rm.
Th
e e
nerg
y u
sag
e fro
m th
e d
ecom
mis
sio
nin
g o
f the E
&B
infra
stru
ctu
re is
estim
ate
d to
be
710
,82
7 G
J d
irect (v
esse
l use) a
nd 1
79
,81
0 G
J in
dire
ct re
qu
irem
ents
(ma
nufa
ctu
re o
f ne
w
ma
teria
ls to
repla
ce th
ose
deco
mm
issio
ne
d in
situ
and
those re
cove
red
sh
ou
ld n
on
e o
f them
b
e re
use
d).
Tota
l dire
ct C
O2 e
mis
sio
ns g
ene
rate
d b
y th
e p
rop
osed
deco
mm
issio
nin
g a
ctiv
ities c
om
pris
e
em
issio
ns fro
m v
essels
. Th
e C
O2 e
mis
sio
ns fro
m v
essels
eq
uate
to 0
.53 %
of U
K d
om
estic
sh
ippin
g e
mis
sio
ns 2
01
4. E
mis
sio
ns to
atm
osph
ere
from
the d
eco
mm
issio
nin
g a
ctiv
ities a
re
unlik
ely
to s
ign
ifica
ntly
co
ntrib
ute
to g
reen
ho
use
ga
s e
mis
sio
ns o
r glo
ba
l wa
rmin
g im
pacts
.
Sta
nd
ard
mitig
atio
n m
easu
res to
optim
ise
ene
rgy u
sa
ge
by v
essels
will in
clu
de
ope
ratio
na
l p
ractic
es
and
p
ow
er
ma
nag
em
ent
syste
ms
for
eng
ines,
ge
ne
rato
rs
and
a
ny
oth
er
co
mb
ustio
n p
lant a
nd
pla
nn
ed
pre
ve
nta
tive
ma
inte
na
nce
syste
ms fo
r all e
qu
ipm
ent fo
r peak
ope
ratio
na
l effic
iency.
7.2
D
isch
arg
es to
Sea
Th
ere
is th
e p
ote
ntia
l for
sm
all
qu
antitie
s o
f re
sid
ua
l ch
em
ica
ls a
nd
hyd
roca
rbo
ns to
be
rele
ase
d in
to th
e w
ate
r co
lum
n fro
m liftin
g o
f su
bse
a in
frastru
ctu
re a
nd
from
ve
ssels
used
for
deco
mm
issio
nin
g. T
he s
eab
ed
and
the w
ate
r co
lum
n a
re th
e p
rima
ry re
ce
pto
rs. M
itiga
tion
inclu
de
s a
su
ccessfu
l po
st-C
OP
d
eo
iling
p
rog
ram
me,
ch
em
ica
l se
lectio
n p
roce
sse
s,
any
perm
itting
of h
yd
roca
rbon
and
ch
em
ica
l dis
ch
arg
es a
nd
stric
t ve
ssel o
pe
ratin
g p
roced
ure
s.
All o
f these im
pacts
will b
e lo
calis
ed a
nd
sh
ort te
rm g
ive
n th
e h
igh
ly d
yn
am
ic e
nviro
nm
ent
aro
un
d E
&B
Bla
ckb
ird a
nd E
ttrick D
eco
mm
issio
nin
g E
IA
Do
cu
me
nt N
o. E
TR
K0
00
1-G
E-O
000-L
C-R
PT
-0006
No
ve
mb
er 2
016
P
ag
e 9
0 o
f 109
7.3
S
olid
De
po
sits
on
the S
eab
ed
an
d D
istu
rban
ce
to th
e S
ea
bed
Th
e prin
cip
al
so
urc
es of
se
ab
ed
d
istu
rban
ce asso
cia
ted
w
ith th
e E
&B
d
eco
mm
issio
nin
g
activ
ities
co
nce
rn
the
rem
ova
l o
f stru
ctu
res,
sp
oo
ls,
mattre
sses
and
g
rout
ba
gs,
rock
dum
pin
g o
f flow
line e
nd
s, c
uttin
g o
pe
ratio
ns a
nd a
nch
orin
g o
f the s
em
i-su
bm
ers
ible
drillin
g
rig.
Th
ese
a
ctiv
ities w
ill re
sult
in th
e d
isp
lacem
ent
of
su
bstra
te a
nd
th
e su
spe
nsio
n a
nd
su
bse
qu
ent
se
ttlem
ent
of
se
dim
ent.
Sta
nda
rd
me
asu
res
to
co
ntro
l d
istu
rba
nce
inclu
de
ope
ratio
na
l pla
nn
ing a
nd e
qu
ipm
en
t se
lectio
n.
Th
e s
pecie
s a
nd
hab
itats
obse
rve
d in
the v
icin
ity o
f the E
&B
field
s a
re re
lativ
ely
wid
esp
rea
d
thro
ug
hout
the
CN
S
and
th
e
are
a
antic
ipate
d to
b
e
imp
acte
d re
pre
sen
ts
a
ve
ry
sm
all
perc
enta
ge
of th
e a
va
ilab
le h
ab
itat. F
urth
erm
ore
, all d
istu
rbe
d s
edim
ents
are
exp
ecte
d to
re
cove
r rapid
ly th
ou
gh
recru
itme
nt fro
m a
dja
cent u
nd
istu
rbe
d a
rea
s. In
add
ition th
ere
we
re
no M
DA
C fe
atu
res id
entifie
d in
the s
urv
eys c
arrie
d o
ut in
the a
rea o
f the E
&B
deve
lopm
ents
.
In sum
mary
, d
ue to
th
e lo
calis
ed a
nd
re
lativ
ely
sh
ort
dura
tion of
the d
eco
mm
issio
nin
g
activ
ities,
and
w
ith
the
iden
tified
co
ntro
l a
nd
m
itigatio
n
me
asure
s
in
pla
ce,
the
ove
rall
sig
nific
ance
of th
e im
pact o
f se
ab
ed d
istu
rban
ce a
s a
result o
f the d
eco
mm
issio
nin
g o
f E&
B
field
s is
co
nsid
ere
d to
be lo
w.
7.4
U
nd
erw
ate
r No
ise
Alth
ou
gh
there
are
marin
e m
am
ma
ls a
nd
fish
in th
e a
rea
aro
un
d th
e E
&B
field
, dis
turb
ance
from
nois
e re
sultin
g fro
m d
ecom
mis
sio
nin
g a
ctiv
ities is
exp
ecte
d to
be lo
w. T
he g
rea
test
pote
ntia
l dis
turb
an
ce is
as a
result o
f ve
ssels
usin
g D
P. H
ow
eve
r, giv
en th
at E
&B
are
in a
n
are
a o
f esta
blis
hed
oil a
nd
ga
s a
ctiv
ity, m
arin
e m
am
ma
ls a
re lik
ely
to b
e a
ccusto
me
d to
sim
ilarly
so
un
d le
ve
ls a
nd
this
redu
ces th
e s
eve
rity o
f imp
act.
7.5
W
aste
Man
ag
em
en
t an
d R
eso
urc
e U
se
All re
gu
lato
ry a
nd
co
mp
an
y p
roce
dure
s fo
r seg
reg
atio
n, tra
nsp
ort a
nd
dis
posa
l will b
e s
trictly
a
dh
ere
d to
a
nd
o
nly
fu
lly p
erm
itted fa
cilitie
s w
ill b
e u
sed
fo
r re
cyclin
g o
r d
isp
osa
l. T
he
resultin
g im
pacts
from
resou
rce
use a
nd
wa
ste
ma
nag
em
ent a
re th
ere
fore
exp
ecte
d to
be
low
.
7.6
A
cc
iden
tal E
ven
ts
Th
e m
easure
s th
at a
re in
pla
ce in
the E
&B
field
s a
re c
onsid
ere
d e
ffectiv
e in
min
imis
ing th
e
risk o
f a la
rge
oil re
lease
durin
g d
ecom
mis
sio
nin
g a
ctiv
ities to
AL
AR
P.
7.7
S
ocio
-Eco
no
mic
Imp
acts
Ove
rall
so
cio
-econ
om
ic im
pacts
in
rela
tion
to s
hip
pin
g, fis
hin
g a
nd
em
plo
ym
ent
resultin
g
from
the d
ecom
mis
sio
nin
g a
ctiv
ities a
re c
onsid
ere
d to
be lo
w.
7.8
O
vera
ll Co
nclu
sio
n
Th
is
EIA
h
as
assesse
d
the
imp
acts
a
nd
risks
associa
ted
w
ith
the
pro
po
sed
deco
mm
issio
nin
g a
ctiv
ities in
the c
on
text o
f the e
nviro
nm
ent w
ithin
wh
ich
the E
&B
field
s a
nd
infra
stru
ctu
re a
re s
ituate
d. W
ith im
ple
me
nta
tion
of th
e p
ropo
sed
mitig
atio
n m
easure
s, th
e
enviro
nm
enta
l imp
act o
f the re
mo
va
l of th
e fa
cilitie
s is
like
ly to
be te
mp
ora
ry w
ith re
ga
rd to
Bla
ckb
ird a
nd E
ttrick D
eco
mm
issio
nin
g E
IA
Do
cu
me
nt N
o. E
TR
K0
00
1-G
E-O
000-L
C-R
PT
-0006
No
ve
mb
er 2
016
P
ag
e 9
1 o
f 109
dis
turb
ed
se
abe
d w
ithin
the p
roje
ct fo
otp
rint. R
eco
ve
ry o
f the e
colo
gy is
exp
ecte
d to
beg
in
imm
edia
tely
o
n co
mp
letio
n o
f th
e a
ctiv
ities.
Ro
ck p
laced
o
ve
r cu
t p
ipe
e
nd
s a
nd
sh
ort
leng
ths of
exp
ose
d p
ipelin
es to
m
ake
th
e se
ab
ed
safe
fo
r fis
hin
g w
ill h
ave
a
lo
ng
-term
p
resen
ce, b
ut w
ill be v
ery
limite
d in
exte
nt. T
he p
ropo
sed
app
roa
ch
to d
eco
mm
issio
nin
g th
e
E&
B fa
cilitie
s w
ill rem
ove
ma
n-m
ade s
tructu
res fro
m th
e s
eab
ed, le
avin
g it in
a c
ond
ition
su
itable
for re
-co
lonis
atio
n b
y lo
cal s
pecie
s a
nd s
afe
for fis
herm
en.
Bla
ckb
ird a
nd E
ttrick D
eco
mm
issio
nin
g E
IA
Do
cu
me
nt N
o. E
TR
K0
00
1-G
E-O
000-L
C-R
PT
-0006
No
ve
mb
er 2
016
P
ag
e 9
2 o
f 109
R
EF
ER
EN
CE
S
8.0
An
tho
ny, T
. G., W
right, N
. A., &
Eva
ns, M
. A. (2
00
9). R
evie
w o
f div
er n
ois
e e
xp
osu
re. R
ese
arc
h
Re
port 7
35
. Pre
pare
d b
y Q
inetiQ
for th
e H
SE
BM
T C
ord
ah
. (19
98). U
KC
S 1
8th
Ro
un
d E
nviro
nm
en
tal S
cre
en
ing R
ep
ort. A
rea II C
entra
l No
rth S
ea
. U
KO
OA
.
BM
T C
ord
ah
. (20
11). T
he M
an
ag
em
ent o
f Marin
e G
row
th R
ep
ort. A
va
ilab
le a
t: h
ttp://o
ilan
dg
asu
k.c
o.u
k/w
p-c
onte
nt/u
plo
ad
s/2
01
5/0
4/e
xp
erie
nce
-pd
f.pdf
BO
DC
(Britis
h O
ce
ano
gra
ph
ic D
ata
Ce
ntre
). (19
98
). Un
ited
Kin
gdo
m D
igita
l Ma
rine
Atla
s. U
KD
MA
P.
(Th
ird E
ditio
n). B
irke
nh
ea
d.
Ca
rter, L
. (201
0). S
ubm
arin
e C
ab
les a
nd th
e O
ce
an
s: C
on
ne
ctin
g th
e W
orld
. UN
EP
-WC
MC
B
iod
ive
rsity
Se
ries.
CC
C. (2
01
6). M
ee
ting
Carb
on B
udg
ets
-Pro
gre
ss in
red
ucin
g th
e U
K’s
em
issio
ns. 2
016
Re
po
rt to
Pa
rliam
ent. A
va
ilab
le fo
r do
wn
loa
d fro
m: h
ttps://w
ww
.theccc.o
rg.u
k/p
ub
lica
tion/m
eetin
g-
ca
rbo
n-b
ud
ge
ts-2
016-p
rogre
ss-re
po
rt-to-p
arlia
me
nt/.
Cla
rke
, D.G
. an
d W
ilber, D
.H. (2
00
0). A
sse
ssm
ent o
f pote
ntia
l imp
acts
of d
red
gin
g o
pera
tions d
ue to
se
dim
ent re
su
sp
en
sio
n. D
OE
R T
ech
nic
al N
ote
s C
olle
ctio
n (E
RD
C T
N-D
OE
RE
9), U
S A
rmy
En
gin
eer
Re
se
arc
h
an
d
De
ve
lopm
ent
Ce
ntre
, V
icksb
urg
, M
S.
Acce
sse
d
at:
ww
w.w
es.a
rmy.m
il/el/d
ots
/doe
r.
Co
leb
roo
k, J
. M. (1
98
2). C
ontin
uo
us p
lankto
n re
co
rds: s
easo
na
l va
riatio
ns in
the
dis
tribu
tion a
nd
a
bu
nd
an
ce
of p
lan
kto
n in
the N
orth
Atla
ntic
Oce
an
an
d th
e N
orth
Se
a. J
ourn
al o
f Pla
nkto
n
Re
se
arc
h, 4
:43
5 - 4
62
.
Co
ull, K
. A., J
oh
nsto
ne
, R., &
Ro
gers
, S. I. (1
998
). Fis
herie
s S
ensitiv
ity M
ap
s in
Britis
h W
ate
rs.
UK
OO
A L
td.
Da
nso
n, E
. (200
5). G
eote
ch
nic
al a
nd g
eo
physic
al in
ve
stig
atio
ns fo
r offs
ho
re a
nd n
ea
rsh
ore
d
eve
lopm
ents
. Te
ch
nic
al C
om
mitte
e 1
, Inte
rna
tion
al S
ocie
ty fo
r So
il Mech
anic
s a
nd
Ge
ote
ch
nic
al E
ngin
ee
ring
.
de R
ob
ertis
, A., &
Ha
nd
ga
rd, N
. O. (2
013
). Fis
h a
vo
ida
nce
of re
se
arc
h v
esse
ls a
nd th
e e
ffica
cy o
f n
ois
e-re
du
ce
d v
esse
ls: a
revie
w. IC
ES
Jo
urn
al o
f Marin
e S
cie
nce
, 70(1
), 34 - 4
5.
DE
CC
, (201
1). G
uid
an
ce
No
tes o
n th
e O
ffsh
ore
Pe
trole
um
Pro
du
ctio
n a
nd
Pip
elin
es (A
sse
ssm
ent o
f E
nviro
nm
enta
l Effe
cts
) Re
gu
latio
n 1
99
8 (a
s a
me
nd
ed
201
1)
DE
CC
. (201
4a). In
form
atio
n o
n O
ther R
eg
ula
tory
Issu
es b
y B
lock. A
cce
sse
d a
t h
ttps://w
ww
.go
v.u
k/g
ove
rnm
ent/u
plo
ad
s/s
yste
m/u
plo
ad
s/a
ttach
me
nt_
da
ta/file
/27
494
3/2
8R
_ot
her_
reg
ula
tory
_is
su
es.p
df.
DE
CC
. (201
4b). In
form
atio
n o
n L
eve
ls o
f Sh
ipp
ing
Activ
ity. R
etrie
ve
d A
ugu
st 2
01
4, fro
m A
va
ilab
le a
t: h
ttps://w
ww
.go
v.u
k/g
ove
rnm
ent/u
plo
ad
s/s
yste
m/u
plo
ad
s/a
ttach
me
nt_
da
ta/file
/27
393
9/2
8R
_s
hip
pin
g_d
ensity
DE
CC
. (201
6) U
K G
reen
ho
use
Ga
s E
mis
sio
ns, F
ina
l Fig
ure
s. 2
nd
Fe
bru
ary
20
16
. Ava
ilab
le a
t: h
ttps://w
ww
.go
v.u
k/g
ove
rnm
ent/u
plo
ad
s/s
yste
m/u
plo
ad
s/a
ttach
me
nt_
da
ta/file
/49
694
2/2
01
4_
Fin
al_
Em
issio
ns_
Sta
tistic
s_
Re
lea
se
.pd
f
DT
I. (20
01
). Stra
teg
ic E
nviro
nm
en
tal A
sse
ssm
en
t of th
e M
atu
re A
reas o
f the
Offs
hore
North
Se
a.
Bla
ckb
ird a
nd E
ttrick D
eco
mm
issio
nin
g E
IA
Do
cu
me
nt N
o. E
TR
K0
00
1-G
E-O
000-L
C-R
PT
-0006
No
ve
mb
er 2
016
P
ag
e 9
3 o
f 109
SE
A 2
. De
partm
ent o
f Tra
de a
nd In
du
stry
.
DT
I. (20
04
). Stra
teg
ic E
nviro
nm
en
tal A
sse
ssm
en
t of th
e M
atu
re A
reas o
f the
No
rth a
nd
Ce
ntra
l No
rth
Se
a. S
EA
5. C
onsu
ltatio
n D
ocu
me
nt. D
ep
artm
ent o
f Tra
de
and
Ind
ustry
.
Ele
ftherio
u, A
., & B
asfo
rd, D
. J. (1
98
9). T
he m
acro
be
nth
ic in
faun
a o
f the
offs
hore
North
ern
No
rth S
ea
. Jo
urn
al o
f the M
arin
e B
iolo
gic
al A
sso
cia
tion
of th
e U
nite
d K
ing
do
m, 6
9(1
), 12
3 - 1
43.
Essin
k,
K.
(199
9).
Eco
log
ica
l e
ffects
o
f d
um
pin
g o
f d
red
ge
d se
dim
ents
; o
ptio
ns fo
r ma
na
ge
me
nt.
Jo
urn
al o
f Co
asta
l Co
nse
rva
tion
. 5: 6
9-8
0.
Eva
ns, P
. (19
92). S
tatu
s R
evie
w o
f Ce
tace
an
s in
Britis
h a
nd Iris
h W
ate
rs. R
epo
rt to U
K D
ep
artm
ent
of E
nviro
nm
en
t. Oxfo
rd: S
ea
Wa
tch
Fo
und
atio
n.
Fe
BE
C. (2
01
0). S
ed
ime
nt D
ose
Re
sp
onse
Stu
dy. T
ech
nic
al R
ep
ort. P
repa
red
for F
em
ern
A/S
. Do
c.
No
. E4-T
R-0
36
. 14
7 p
p.
Fu
gro
. (20
02). B
uzza
rd A
rea
of O
pe
ratio
ns (B
AO
O) S
ea
be
d S
tratig
raph
ic G
eoh
aza
rd O
ve
rvie
w
Re
port U
KC
S 1
9/1
, 20/1
an
d 2
0/6
. Re
po
rt No
. M70
57.1
.
Fu
gro
(201
0). 2
01
0 C
P S
urv
ey R
ep
ort –
Ne
xe
n E
ttrick P
ipelin
es. R
ep
ort p
rod
uce
d b
y PM
AS
. PM
AC
D
ocu
me
nt N
um
ber 1
40
3.
Fu
gro
(201
2). 2
01
2 C
P S
urv
ey re
po
rt – N
exe
n – E
ttrick –P
ipe
lines. R
ep
ort p
rod
uce
d b
y P
MA
C.
PM
AC
Do
cu
me
nt N
um
ber 1
81
6.
Ga
rdlin
e. (2
010
a). R
eg
iona
l Ma
pp
ing
Pro
ject o
ve
r Go
lden
Ea
gle
, Bla
ckb
ird, E
ttrick a
nd
Bu
zza
rd
Fie
lds. G
ard
line
Pro
ject R
efe
ren
ce
No
. EC
N-2
00
3-1
01
8.
Ge
ne
sis
. (20
14
a). S
urv
ey G
ap A
naly
sis
for E
ttrick a
nd
Bla
ckb
ird D
eco
mm
isio
nin
g P
roje
ct. N
exe
n
Pro
ject N
o. E
TR
K0
00
1-G
E-O
000-L
C-A
NA
-00
01
.
Gu
bb
ay S
., “Ma
rine
ag
gre
ga
te e
xtra
ctio
n a
nd
bio
div
ers
ity. In
form
atio
n, is
su
es a
nd
gap
s in
u
nd
ers
tan
din
g. R
ep
ort to
the
Jo
int M
arin
e P
rog
ram
me
of th
e W
ildlife
Tru
sts
and
WW
F-U
K,”
200
3.
Ha
lvo
rse
n, M
. B., Z
edd
ies, D
. G., E
lliso
n, W
. T., C
hic
oin
e, D
. R., &
Po
pp
er, A
. N. (2
01
2). E
ffects
of
mid
-frequ
en
cy a
ctiv
e s
on
ar o
n h
earin
g in
fish
. Jo
urn
al o
f the
Aco
ustic
al S
ocie
ty o
f Am
eric
a,
131(1
), 599
- 607
.
Inte
rna
tion
al C
ou
ncil fo
r the
Exp
lora
tion o
f the
Se
as (IC
ES
). (20
05
). Re
po
rt of th
e a
d-h
oc g
rou
p o
n
the im
pa
cts
of s
on
ar o
n c
eta
ce
an
s a
nd fis
h (A
GIS
C) (2
nd E
ditio
n). IC
ES
Ad
vis
ory
Co
mm
itte
on E
co
sys
tem
s. IC
ES
CM
200
5/A
CE
:06
.
IoP
, (200
0). G
uid
elin
es fo
r the
ca
lcu
latio
n o
f estim
ate
s o
f ene
rgy u
se
and
gase
ou
s.
Je
nse
n, F
. H., B
ejd
er, L
., Wah
lberg
, M., S
oto
, N. A
., Jo
hn
so
n, M
., & M
adse
n, P
. T. (2
00
9). V
esse
l n
ois
e e
ffects
on d
elp
hin
id c
om
mu
nic
atio
n. M
arin
e E
co
log
y P
rog
ress S
erie
s, 3
95
, 161
– 1
75
.
JN
CC
(1
99
9).
Se
ab
ird
vu
lnera
bility
d
ata
in
U
K
wa
ters
b
lock
sp
ecific
vu
lnera
bility
Jo
int
Na
ture
C
on
se
rva
tion C
om
mitte
e.
JN
CC
(200
8). T
he d
elib
era
te d
istu
rba
nce
of m
arin
e E
uro
pe
an
Pro
tecte
d S
pe
cie
s. G
uid
an
ce
for
En
glis
h a
nd
We
lsh
territo
rial w
ate
rs a
nd
the U
K o
ffsh
ore
ma
rine
are
a.
JN
CC
. (201
0). T
he p
rote
ctio
n o
f ma
rine
Eu
rop
ea
n P
rote
cte
d S
pecie
s fro
m in
jury a
nd
dis
turb
ance
. G
uid
an
ce
for th
e m
arin
e a
rea
in E
ng
lan
d a
nd W
ale
s a
nd
the
UK
offs
hore
ma
rine
are
a. D
raft
Bla
ckb
ird a
nd E
ttrick D
eco
mm
issio
nin
g E
IA
Do
cu
me
nt N
o. E
TR
K0
00
1-G
E-O
000-L
C-R
PT
-0006
No
ve
mb
er 2
016
P
ag
e 9
4 o
f 109
JN
CC
. (201
2). Id
entific
atio
n o
f Prio
rity M
arin
e F
ea
ture
s in
Sco
ttish
Offs
hore
Wa
ters
. JN
CC
Re
po
rt No
. 426.
Jo
hns, D
. G., &
Re
id, P
. C. (2
00
1). A
n O
ve
rvie
w o
f Pla
nkto
n E
co
log
y in
the
North
Se
a. T
ech
nic
al
Re
port p
rod
uce
d fo
r Stra
teg
ic A
sse
ssm
ent - S
EA
2. S
AH
FO
S, T
ech
nic
al R
epo
rt TR
_0
05
.
Jø
rgen
se
n, R
., Ols
en
, K. K
., Fa
lk-P
ette
rse
n, I. B
., & K
an
ap
thip
pila
i, P. (2
00
5). In
ve
stig
atio
ns o
f p
ote
ntia
l effe
cts
of lo
w fre
qu
en
cy s
ona
r sig
na
ls o
n s
urv
iva
l, de
ve
lopm
ent a
nd
be
ha
vio
ur o
f fis
h la
rva
e a
nd ju
ve
nile
s. N
orw
eg
ian C
olle
ge o
f Fis
he
ry S
cie
nce
.
Ka
fas, A
., Jo
nes, G
., Wa
tret, R
., Da
vie
s, I. a
nd
Sco
tt, B. (2
01
2). R
epre
se
nta
tion o
f the
use
of m
arin
e
sp
ace
by c
om
me
rcia
l fish
erie
s in
ma
rine
sp
atia
l pla
nn
ing. IC
ES
CM
I:23
.
Kva
ldsh
eim
, P. H
., & S
eva
ldse
n, E
. M. (2
00
5). T
he
pote
ntia
l imp
act o
f 1-8
kH
z a
ctiv
e s
ona
r on s
tocks
of ju
ve
nile
fish
durin
g s
on
ar e
xe
rcis
es. F
ors
va
rets
Fo
rskn
ingsin
stitu
tt (No
rwe
gia
n D
efe
nce
R
ese
arc
h E
sta
blis
hm
ent). F
FA
/RA
PP
OR
T-2
00
5/0
10
27
.
Mits
on
, R. B
., & K
nu
dse
n, H
. P. (2
00
3). C
au
se
s a
nd
effe
cts
of u
nd
erw
ate
r no
ise
on fis
h a
bu
nd
ance
e
stim
atio
n. A
qu
atic
Liv
ing R
eso
urc
es, 1
6, 2
55
- 26
3.
Ne
wco
mb
e, C
.P a
nd
Je
nse
n, J
.O.T
. (199
6). C
ha
nne
l su
sp
en
de
d s
edim
ent a
nd fis
herie
s: A
syn
thesis
fo
r q
ua
ntita
tive
A
sse
ssm
en
t o
f R
isk
and
Im
pact.
No
rth
Am
eric
an
Jo
urn
al
of
Fis
he
ries
Man
ag
em
en
t. 16
(4): 6
93
-72
7.
Ne
xe
n. (2
005
). Ettric
k F
ield
De
ve
lopm
ent E
nviro
nm
enta
l De
ve
lop
me
nt. D
TI P
roje
ct R
efe
ren
ce
No
. W
/281
7/2
00
5.
Ne
xe
n. (2
010
). Bla
ckb
ird D
eve
lop
me
nt E
nviro
nm
en
tal S
tate
me
nt, B
BD
-HS
-ST
A-0
001
1.
Ne
xe
n (2
014
). Co
mp
ara
tive
Asse
ssm
ent R
epo
rt. Ne
xe
n D
ocu
me
nt N
um
ber E
TR
K0
00
1-P
I-O0
00-D
O-
RP
-00
02. R
ev C
1.
Ne
xe
n a
nd
Ge
ne
sis
. (201
4). E
ttrick &
Bla
ckb
ird D
eco
mm
issio
nin
g P
roje
ct - E
nviro
nm
en
tal B
ase
line
S
urv
ey S
trate
gy. N
exe
n R
efe
ren
ce
No
. ET
RK
000
1-G
E-O
000-L
C-S
TR
-00
05
.
Ne
xe
n (2
016
a) E
ttrick a
nd
Bla
ckb
ird D
eco
mm
issio
nin
g P
rog
ram
me
s.
Ne
xe
n (2
016
b) E
ttrick A
rea O
ffsh
ore
Oil P
ollu
tion
Em
erg
en
cy P
lan, E
TK
-HS
-PR
P-0
00
37
Nic
ho
lls, P
., He
witt, J
. an
d H
alid
ay, J
. (20
03
). Effe
cts
of S
usp
en
ded
Se
dim
ent C
on
ce
ntra
tions o
n
Su
sp
en
sio
n a
nd
De
posit F
eed
ing M
arin
e M
acro
faun
a. N
IWA
Clie
nt R
epo
rt AR
C0
326
7.
NS
TF
. (19
93). N
orth
Se
a S
ubre
gio
n 2
b A
sse
ssm
en
t Re
po
rt. Qu
ality
Sta
tus o
f the
No
rth S
ea. N
orth
S
ea T
ask F
orc
e S
OA
FD
.
OG
A.(2
01
6) In
form
atio
n o
n S
hip
pin
g L
eve
l Activ
ity. A
va
ilab
le a
t: h
ttps://w
ww
.go
v.u
k/g
ove
rnm
ent/u
plo
ad
s/s
yste
m/u
plo
ad
s/a
ttach
me
nt_
da
ta/file
/54
050
6/2
9R
_S
hip
pin
g_D
ensity
_T
able
.pd
f
OG
UK
(201
3) T
he M
an
ag
em
ent o
f Marin
e G
row
th D
urin
g D
eco
mm
issio
nin
g.
OG
UK
. (20
15) G
uid
elin
e fo
r the
Ab
an
do
nm
ent o
f We
lls, Is
su
e 5
.
OS
PA
R. (2
009
). Ove
rvie
w o
f the
impa
cts
of a
nth
rop
og
enic
un
de
rwa
ter s
ou
nd
in th
e m
arin
e
enviro
nm
en
t. OS
PA
R C
om
mis
sio
n. B
iod
ive
rsity
Se
ries.
Pin
ne
gar, J
. K., C
he
un
g, W
. L., &
He
ath
, M. (2
010
). Fis
herie
s. M
CC
IP A
nnu
al R
ep
ort C
ard
20
10-
201
1, M
CC
IP S
cie
nce
Re
vie
w. R
etrie
ve
d fro
m M
CC
IP: h
ttp://w
ww
.mm
cip
.org
.uk/a
rc
Bla
ckb
ird a
nd E
ttrick D
eco
mm
issio
nin
g E
IA
Do
cu
me
nt N
o. E
TR
K0
00
1-G
E-O
000-L
C-R
PT
-0006
No
ve
mb
er 2
016
P
ag
e 9
5 o
f 109
Po
pp
er, A
. N. (2
00
8). E
ffects
of m
id- a
nd h
igh
-frequ
en
cy s
ona
rs o
n fis
h. E
nviro
nm
en
tal B
ioA
co
ustic
s.
Co
ntra
ct N
666
04
-07
M-6
05
6. N
ava
l Un
ders
ea W
arfa
re C
en
tre D
ivis
ion.
Re
id, J
. B., E
va
ns, P
. G., &
No
rthrid
ge
, S. P
. (20
03
). Atla
s o
f Ce
tace
an
dis
tributio
n in
north
-we
st
Eu
rop
ean
wa
ters
. JN
CC
.
Ric
hard
so
n, W
. J., G
reen
e, C
. J., M
alm
e, C
., & T
hom
so
n, D
. H. (1
99
5). M
arin
e m
am
ma
ls a
nd
no
ise
. A
ca
de
mic
Pre
ss, C
alifo
rnia
, 57
6.
Ro
bin
so
n, G
. (197
0). C
on
tinuo
us p
lan
kto
n re
co
rds: V
aria
tions in
the
se
aso
nal c
ycle
of p
hyto
pla
nkto
n
in th
e N
orth
Atla
ntic
. Bu
ll. Mar. E
co
l., 6, 3
3 - 3
45.
Ro
llan
d, R
. M., P
ark
s, S
. E., H
unt, K
. E., C
aste
llote
, M., C
ork
ero
n, P
. J., N
ow
ace
k, D
. P., W
asse
r, S.
K. a
nd K
raus, S
. D. (2
01
2). E
vid
ence
that s
hip
no
ise
incre
ase
s s
tress in
righ
t wh
ale
s.
Pro
ce
ed
ing
s o
f the
Ro
ya
l So
cie
ty B
. do
i:10
.10
98
/rsp
b.2
01
1.2
42
9.
Ro
ss, D
. (19
76
). Me
ch
an
ics o
f und
erw
ate
r no
ise
. Pe
rga
mo
n, N
ew
Yo
rk. 3
75 p
p.
SC
AR
. (20
02). (S
cie
ntific
Co
mm
ittee
on A
nta
rctic
Re
se
arc
h ) Im
pacts
of m
arin
e a
co
ustic
tech
no
log
y
SC
OS
on th
e A
nta
rctic
en
viro
nm
ent. V
ers
ion 1
.2. S
CA
R a
d h
oc g
rou
p o
n m
arin
e a
co
ustic
te
ch
no
log
y a
nd
the e
nviro
nm
ent.
SC
OS
. (201
1). S
cie
ntific
Ad
vic
e o
n M
atte
rs R
ela
ted
to th
e M
an
age
me
nt o
f Se
al P
opu
latio
ns.
Re
trieve
d fro
m S
MR
U: h
ttp://w
ww
.sm
ru.s
t-and
rew
s.a
c.u
k/d
ocum
ents
/678
SN
H. (2
009
). Fo
rvie
NN
R: T
he R
ese
rve
Sto
ry. R
etrie
ve
d J
uly
201
4, fro
m S
co
ttish
Natu
ral H
erita
ge:
http
://ww
w.s
nh
.org
.uk/p
dfs
/pub
lica
tions/n
nr/F
orv
ieN
NR
Th
eR
ese
rve
Sto
ry.p
df
Sco
ttish
Go
ve
rnm
ent, 2
01
5b
. Fis
hin
g E
ffort a
nd Q
ua
ntity
an
d V
alu
e o
f Lan
din
gs b
y IC
ES
Re
cta
ngle
, A
va
ilab
le fro
m h
ttp://w
ww
.go
v.s
co
t/To
pic
s/S
tatis
tics/B
row
se
/Ag
ricu
lture
-F
ish
erie
s/R
ecta
ng
leD
ata
Se
a M
am
ma
l Re
se
arc
h U
nit (S
MR
U) (2
00
8). S
CA
NS
-II Sm
all C
eta
ce
an
s in
the E
uro
pe
an
Atla
ntic
an
d
No
rth S
ea. A
va
ilable
from
SM
RU
, Ga
tty M
arin
e L
abo
rato
ry, U
niv
ers
ity o
f St A
ndre
ws, S
t A
ndre
ws, F
ife, K
Y1
6 8
LB
, UK
.
Sla
bb
eko
orn
, H., B
outo
n, N
., va
n O
pze
ela
nd, I., C
oers
, A., te
n C
ate
, C. a
nd P
op
pe
r, A. N
. (201
0). A
n
ois
y s
prin
g: th
e im
pact o
f glo
bally
risin
g u
nde
rwa
ter s
oun
d le
ve
ls o
n fis
h. T
ren
ds in
Eco
log
y
and
Evo
lutio
n. 2
5(7
):41
9-4
27
So
uth
all, B
. L., B
ow
les, A
. E., E
lliso
n, W
. T., F
inne
ran
, J. J
., Ge
ntry
, R. L
., Gre
en
e J
r, C. R
., Ka
sta
k,
D., K
ette
n, D
. R., M
iller, J
. H., N
ach
tiga
ll, P. E
., Ric
hard
so
n, W
. J., T
hom
as, J
. A., a
nd T
ya
ck,
P. L
. (20
07
). Ma
rine
mam
mal n
ois
e e
xp
osu
re c
riteria
: Initia
l scie
ntific
reco
mm
enda
tion
s.
Aq
ua
tic M
am
ma
ls, 3
3 (4
), 01
67
-54
27
.
Sto
ne
, C.J
. et a
l., (199
5). A
n a
tlas o
f se
ab
ird d
istrib
utio
n in
north
-we
st E
uro
pe
an w
ate
rs, 3
26
pa
ges,
A4
so
ftback, IS
BN
1 8
737
01
94
2.
Tve
dte
n (2
001
). EIA
of d
isp
osa
l of m
arin
e g
row
th fro
m M
au
ree
n a
t Ake
r Sto
rd. Ø
yvin
d F
. Tve
dte
n, R
F
– R
og
ala
nd
Re
se
arc
h.
Tu
rrell, W
. R. (1
992
). Ne
w h
yp
oth
esis
co
nce
rnin
g th
e c
ircu
latio
n o
f the
No
rthe
rn N
orth
Se
a a
nd
its
rela
tion to
the N
orth
Se
a fis
h s
tocks re
cru
itme
nt. IC
ES
. J. M
ar. S
ci., 4
9, 1
07
- 123
.
Wa
les, S
. C., &
He
itme
ye
r, R. M
. (20
02
). An
ense
mb
le s
ourc
e s
pectra
mo
de
l for m
erc
han
t sh
ip-
radia
ted n
ois
e. J
ourn
al o
f the A
co
ustic
al S
ocie
ty o
f Am
eric
a, 1
11
, 12
11 - 1
23
1.
Bla
ckb
ird a
nd E
ttrick D
eco
mm
issio
nin
g E
IA
Do
cu
me
nt N
o. E
TR
K0
00
1-G
E-O
000-L
C-R
PT
-0006
No
ve
mb
er 2
016
P
ag
e 9
6 o
f 109
Blackbird and Ettrick Decommissioning EIA
Document No. ETRK0001-GE-O000-LC-RPT-0006
November 2016 Page 97 of 109
APPENDIX A ENVID TABLES. 9.0
Subsea Recovery
Aspect Source Impact
Lik
eli
ho
od
Se
ve
rity
Ris
k
Mitigation / Prevention/ Control
Re
sid
ua
l
Ris
k
Physical presence Navigation hazard caused by vessel
Interference with fishing, offloading tankers and supply vessels. Disturbance to birds/cetaceans.
B 1
Low
Manifold and FPSO 500 m safety zones maintained.
Consultation with SFF.
Kingfisher Bulletin.
Notice to Mariners.
SimOps plan in place.
Permit to work required. Optimise vessel use.
Low
Infrastructure (e.g. pipelines, and rock cover) left in place: long term fate of materials
Non-biodegradable materials. Hazard to sea users.
C 1
Low
Trenched and buried/rock dumped. Seabed clearance survey carried out by SFF. Monitoring program.
Low
Emissions to air Vessel fuel combustion emissions (CO2, CO, SOx, NOx, etc.)
Deterioration of local air quality and contribution to climate change. Minor contribution to atmospheric pollution (compared to overall activity in the North Sea).
E 1
Med
ium
Conform to MARPOL NOx and SOx limits. Optimise vessel use.
Low
Blackbird and Ettrick Decommissioning EIA
Document No. ETRK0001-GE-O000-LC-RPT-0006
November 2016 Page 98 of 109
Subsea Recovery
Aspect Source Impact
Lik
eli
ho
od
Se
ve
rity
Ris
k
Mitigation / Prevention/ Control
Re
sid
ua
l
Ris
k
Depressurisation of gas export line: flaring/venting resulting in release of CH4, CO2, SOx, NOx, VOC, NOx and particulates
Emissions to atmosphere result in a minor contribution to global warming, acidification and photochemical smog (compared to overall activity in the North Sea).
E 1
Med
ium
Covered by flaring consent.
Low
Discharges to sea Chemical purge into production header at trees; bulk deoiling and flushing of the production and test lines (discharge to sea or at Norwegian port)
Local water quality deterioration, impact on marine flora and fauna.
B 2
Low
Variation to offshore production chemical permit to capture use and discharge. Least harmful chemicals selected (subject to chemical risk assessment).
Low
Flushing of lines associated with E&B drill centres for bullheading
Smothering of benthic organisms, suspended solids, and local water quality deterioration.
A 1
Low
MEG is a PLONOR chemical and use and discharge will be covered on chemical permit. Keep within maximum operating pressure of xmas tree.
Low
Flushing WI systems with inhibited seawater
Follows normal operational procedures, No significant aspects identified.
Flushing of umbilicals: potential discharge via topsides
Smothering of benthic organisms, suspended solids, and local water quality deterioration.
A 1
Low
Variation to offshore production chemical permit to capture use and discharge. Least harmful chemicals selected (subject to chemical risk assessment). Injection downhole may be possible.
Low
Blackbird and Ettrick Decommissioning EIA
Document No. ETRK0001-GE-O000-LC-RPT-0006
November 2016 Page 99 of 109
Subsea Recovery
Aspect Source Impact
Lik
eli
ho
od
Se
ve
rity
Ris
k
Mitigation / Prevention/ Control
Re
sid
ua
l
Ris
k
Subsea disconnections: potential discharge of oil and chemicals
Local water quality deterioration, impact on marine flora and fauna.
D 1
Low
Chemical use and discharge covered in permit. Any discharges will be subject to chemical risk assessment.
Low
Seabed disturbance
Recovery of subsea infrastructure and temporary storage on seabed: de-burial, wet storage, potential impact of buoy after release, suction cans, dredging (e.g. around base of SSIV), clump weights and transponders
Localised impact on benthic communities. Environmental surveys in the area identified no Annex I or II habitats or species.
D 1
Low
Rapid recovery of seabed. Activities covered on EIA Justification and Marine Licence.
Low
Additional deposits. Change of habitat for marine flora and fauna.
C 1
Low
Deposits covered in Marine Licence. L
ow
Disturbance of old cuttings piles.
Localised impact on benthic communities. Environmental surveys in the area identified no Annex I or II habitats or species.
B 1
Low
Captured in EIA Justification and pre-decommissioning surveys. L
ow
Blackbird and Ettrick Decommissioning EIA
Document No. ETRK0001-GE-O000-LC-RPT-0006
November 2016 Page 100 of 109
Subsea Recovery
Aspect Source Impact
Lik
eli
ho
od
Se
ve
rity
Ris
k
Mitigation / Prevention/ Control
Re
sid
ua
l
Ris
k
Underwater noise Cutting (driven piles will be cut), DP, diver tools. Use of explosives unlikely but not ruled out.
Generates elevated sound levels which can affect the behaviour of fish and marine mammals in the area. If explosives are used there is the potential for injury to fish and marine mammals.
E 1
Med
ium
Assessed in EIA Justification. Noise considered below action threshold unless explosives are used. If explosives are used a full impact assessment and adherence to JNCC protocol for use of explosives (JNCC, 2009).
Low
Vessels. Disturbance of marine mammals and fish.
D 1
Low
Minimise use of vessels Noise considered below action threshold. L
ow
Waste Radioactive waste Radioactive waste disposal onshore. Use of landfill. Additional emissions from transport. Effects associated with onshore disposal are dependent on the nature of the site or process. Landfills - land take, nuisance, emissions (methane), possible leachate, limitations on future land use. Treatment plants - nuisance, atmospheric emissions, potential for contamination of sites.
C 2
Low
SEPA permit for accumulation and disposal of radioactive waste (Radioactive Substances Act, 1993). Waste management plan will provide a disposal chain.
Low
Blackbird and Ettrick Decommissioning EIA
Document No. ETRK0001-GE-O000-LC-RPT-0006
November 2016 Page 101 of 109
Subsea Recovery
Aspect Source Impact
Lik
eli
ho
od
Se
ve
rity
Ris
k
Mitigation / Prevention/ Control
Re
sid
ua
l
Ris
k
Disposal of subsea infrastructure
Impacts associated with onshore disposal are dependent on the nature of the site or process. Landfills – land take, nuisance, emissions (methane), possible leachate, limitations on future land use. Treatment plants - nuisance, atmospheric emissions, potential for contamination of sites.
E 1
Med
ium
Follow the waste hierarchy to minimise amount to landfill. Scrap metal wastes to be properly segregated for recycling / disposal onshore. Recycling of structures where possible.
Low
Societal impacts Use of landfill Use of a finite resource. C 1
Low
Follow the waste hierarchy to minimise amount to landfill. L
ow
Accidental events Methanol or MEG discharges to sea
Local water quality deterioration, impacts on marine flora and fauna.
B 2
Low
Flushing and preservation regime to avoid unplanned discharges. Compatibility study on chemicals.
Low
Damage to pipelines from corrosion or dropped objects resulting in discharge of small volumes of hydrocarbons
Local water quality deterioration, impacts on marine flora and fauna.
B 2
Low
Flushing and preservation regime to avoid unplanned discharges. Pipelines buried and rock dumped. Annual pipeline inspection. OPEP will be in place.
Low
Blackbird and Ettrick Decommissioning EIA
Document No. ETRK0001-GE-O000-LC-RPT-0006
November 2016 Page 102 of 109
Well Plug and Abandonment
Aspect Source Impact
Lik
eli
ho
od
Se
ve
rity
Ris
k
Mitigation / Prevention/ Control
Re
sid
ua
l
Ris
k
Physical presence of drilling rig/well intervention vessel
Navigation hazard Interference with fishing, offloading tankers and supply vessels. Disturbance to birds/cetaceans.
B 1
Low
Manifold and FPSO 500 m safety zones maintained.
Consultation with SFF.
Kingfisher Bulletin.
Notice to Mariners.
SimOps plan in place.
Permit to work required. Optimise vessel use.
Low
Emissions to air Exhaust emissions from abandonment operations (i.e. burning of diesel)
Emissions to atmosphere result in a minor contribution to global warming, acidification and photochemical smog (compared to overall activity in the North Sea).
E 1
Med
ium
Adherence to good operating practices. UK and EU Air Quality Standards not exceeded.
Low
Discharges to sea Reservoir conditioning (bullheading): potential release of small volumes of MEG with traces of oil
Large volumes of MEG can pool on the seabed and cause smothering of benthic organisms, suspended solids, local water quality deterioration.
A 1
Low
MEG is a PLONOR (Pose Little or NO Risk) chemical and use and discharge will be covered on chemical permit. Keep within maximum operating pressure of Xmas tree.
Low
Permanent barrier setting: potential discharges of cement and chemicals
Short term impact on water quality and localised smothering of seabed and associated biota.
C 1
Low
Least harmful chemicals selected (subject to chemical risk assessment). Use and discharge will be covered on chemical permit. Cement use will be minimised by good operating practice. Excess dry cement will be shipped to shore and not discharged to sea.
Low
Blackbird and Ettrick Decommissioning EIA
Document No. ETRK0001-GE-O000-LC-RPT-0006
November 2016 Page 103 of 109
Well Plug and Abandonment
Aspect Source Impact
Lik
eli
ho
od
Se
ve
rity
Ris
k
Mitigation / Prevention/ Control
Re
sid
ua
l
Ris
k
Circulation and perforation: release of wellbore clean-up fluids contaminated with residual OBM
Minor loss of seabed habitat and smothering of benthic organisms from suspended solids. Environmental surveys in the area identified no Annex I or II habitats or species.
C 1
Low
Use and discharge will be covered on chemical permit. L
ow
Seabed disturbance Anchoring of vessels Anchors, chains and chain slap prior to tensioning can cause anchor scars to sea bed. Small area of seabed impacted. Environmental Surveys in the area identified no Annex I or II habitats or species.
C 1
Low
Anchoring patterns and mooring plans formulated in advance. L
ow
Removal of subsea structures. Cut casing below seabed and pull tree and wellhead. Temporary wet storage if required.
Small impact on seabed. Discharge of grit.
E 1
Med
ium
Covered on Marine Licence.
Low
Underwater noise Cutting (driven piles will be cut), DP and diver tools.
Generates elevated sound levels which can affect the behaviour of fish and marine mammals in the area.
E 1
Med
ium
Assessed in the Environmental Impact Assessment. Noise considered below action threshold.
Low
Blackbird and Ettrick Decommissioning EIA
Document No. ETRK0001-GE-O000-LC-RPT-0006
November 2016 Page 104 of 109
Well Plug and Abandonment
Aspect Source Impact
Lik
eli
ho
od
Se
ve
rity
Ris
k
Mitigation / Prevention/ Control
Re
sid
ua
l
Ris
k
Waste Cut and recover tubing: radioactivity.
Potential discharge of small quantities of radioactive waste may have impact on water quality and marine flora and fauna.
C 1
Low
Scottish Environment Protection Agency (SEPA) permit for accumulation and disposal of radioactive waste. Cleaning of waste to allow disposal of small quantities in line with permit conditions and the Radioactive Substances Act, 1993.
Low
Cut and recover tubing: limited resource
Radioactive waste disposal onshore. Use of landfill. Additional emissions from transport. Effects associated with onshore disposal are dependent on the nature of the site or process. Landfills - land take, nuisance, emissions (methane), possible leachate, limitations on future land use. Treatment plants - nuisance, atmospheric emissions, potential for contamination of sites.
C 2
Low
SEPA permit for accumulation and disposal of radioactive waste (Radioactive Substances Act, 1993). Waste management plan will provide a disposal chain which will include possible recycling of the steel.
Low
Blackbird and Ettrick Decommissioning EIA
Document No. ETRK0001-GE-O000-LC-RPT-0006
November 2016 Page 105 of 109
Well Plug and Abandonment
Aspect Source Impact
Lik
eli
ho
od
Se
ve
rity
Ris
k
Mitigation / Prevention/ Control
Re
sid
ua
l
Ris
k
Disposal of subsea infrastructure
Impacts associated with onshore disposal are dependent on the nature of the site or process. Landfills – land take, nuisance, emissions (methane), possible leachate, limitations on future land use. Treatment plants- nuisance, atmospheric emissions, potential for contamination of sites.
E 1
Med
ium
Follow the waste hierarchy to minimise amount to landfill. Scrap metal wastes to be properly segregated for recycling / disposal onshore. Reuse of structures where possible.
Low
Societal impacts Disposal of waste materials: transport and use of landfill
Use of a finite resource. C 1
Low
Follow the waste hierarchy to minimise amount to landfill. L
ow
Accidental events Accidental release of old OBM Loss of seabed habitat and smothering of benthic organisms from suspended solids. Environmental surveys in the area identified no Annex I or II habitats or species.
C 1
Low
Approved Oil Pollution Emergency Plan (OPEP) in place. L
ow
Blackbird and Ettrick Decommissioning EIA
Document No. ETRK0001-GE-O000-LC-RPT-0006
November 2016 Page 106 of 109
Well Plug and Abandonment
Aspect Source Impact
Lik
eli
ho
od
Se
ve
rity
Ris
k
Mitigation / Prevention/ Control
Re
sid
ua
l
Ris
k
Permanent barrier failure: potential release of hydrocarbons
Damage to commercial fisheries, sediment and water quality impairment and release of atmospheric emissions. Impacts on marine flora and fauna.
A 3
Low
The design and integrity of cement plugs will adhere to Nexen’s well abandonment policy and will follow UKOOA guidelines for well abandonment and suspension. Reservoir sub-hydrostatic. Wells bullheaded to inhibit release of hydrocarbons. Legal guidelines requiring a minimum of two barriers adhered to. All barriers tested. Fully rated and tested blind flange between all wells and environment, double block and bleed. Annual ROV inspection. Guard vessel stationed at field provides 24 hour surface monitoring. Oil spill contingency plan. WIMS (Well Integrity Management System).
Low
Permanent barrier setting: unplanned discharge of out of spec cement
Loss of seabed habitat and smothering of benthic organisms from suspended solids. Environmental surveys in the area identified no Annex I or II habitats or species.
C 1
Low
Personnel training. Preparation of cement unit. L
ow
Blackbird and Ettrick Decommissioning EIA
Document No. ETRK0001-GE-O000-LC-RPT-0006
November 2016 Page 107 of 109
Post –Decommissioning Survey
Aspect Source Impact
Lik
eli
ho
od
Se
ve
rity
Ris
k
Mitigation / Prevention/ Control
Re
sid
ua
l
Ris
k
Physical presence of survey vessels
Navigation hazard Interference with fishing, offloading tankers and supply vessels. Disturbance to birds/cetaceans.
B 1
Low
Manifold and FPSO 500 m safety zones maintained.
Consultation with Scottish Fishermen’s Federation.
Kingfisher Bulletin.
Notice to Mariners.
SimOps plan in place.
Permit to work required.
Optimise vessel use.
Low
Emissions to air Vessel fuel combustion emissions (CO2, CO, SOx, NOx, etc.)
Deterioration of local air quality and contribution to climate change. Minor contribution to atmospheric pollution (compared to overall activity in the North Sea).
E 1
Med
ium
Conform to MARPOL NOx and SOx limits.
Optimise vessel use.
Low
Discharges to sea Oily water; (machinery space drainage, maximum 15 ppm oil in water)
Local water quality deterioration; impact on marine flora and fauna.
E 1
Med
ium
MARPOL compliant. Optimise vessel use. L
ow
Ballast water Non-native species introduced to environment.
A 1
Low
Ballast water management system in place. L
ow
Blackbird and Ettrick Decommissioning EIA
Document No. ETRK0001-GE-O000-LC-RPT-0006
November 2016 Page 108 of 109
Post –Decommissioning Survey
Aspect Source Impact
Lik
eli
ho
od
Se
ve
rity
Ris
k
Mitigation / Prevention/ Control
Re
sid
ua
l
Ris
k
Seabed disturbance Survey grab samples Small area of seabed impacted. Environmental Surveys in the area identified no Annex I or II habitats or species.
D 1
Low
Sediments relatively clean. Optimise sampling design. L
ow
Anchoring of vessels Immediate disturbance and potential smothering of seabed and benthic faunal communities. Environmental Surveys in the area identified no Annex I or II habitats or species.
C 1
Low
Anchoring patterns and mooring plans. L
ow
Underwater noise Vessels and survey equipment Generates elevated sound levels which can affect the behaviour of fish and marine mammals in the area.
D 1
Low
Covered by Marine Survey permit.
Low
Waste General operational waste from vessels including waste oil, scrap metal, oily cloths, etc.
Effects associated with onshore disposal are dependent on the nature of the site or process. Landfills - land take, nuisance, emissions (methane), possible leachate, limitations on future land use. Treatment plants - nuisance, atmospheric emissions, potential for contamination of sites.
D 1
Low
Compliance with MARPOL requirements. Vessel owner to minimise all wastes. Waste Management Plan. Waste minimisation and supply chain management.
Low
Domestic sewage; grey and black water macerated to <6 mm prior to discharge
High Biochemical Oxygen Demand (BOD) may have immediate local impact on water quality (deoxygenation), resultant impacts on marine flora and fauna.
E 1
Med
ium
MARPOL compliant. Optimise vessel use. L
ow
Blackbird and Ettrick Decommissioning EIA
Document No. ETRK0001-GE-O000-LC-RPT-0006
November 2016 Page 109 of 109
Post –Decommissioning Survey
Aspect Source Impact
Lik
eli
ho
od
Se
ve
rity
Ris
k
Mitigation / Prevention/ Control
Re
sid
ua
l
Ris
k
Food waste Potential food chain impacts through introduction of an anthropogenic food source.
E 1
Med
ium
MARPOL compliant. Optimise vessel use. L
ow
Accidental events Leaks to sea of hydraulic fluid from Remotely Operated Vessels (ROV) (water-based)
Local water quality deterioration, impact on marine flora and fauna.
C 2
Low
Maintenance routine carried out by contractor. L
ow
Oil spill due to vessel collision Water quality deterioration, impact on marine flora and fauna. Immediate oxygen demand on receiving water with consequential impacts on marine fauna.
A 3
Low
Emergency response plans in place including Shipboard Oil Pollution Emergency Plan (SOPEP) for vessel (required under Merchant Shipping Regulations).
Manifold and FPSO 500 m safety zones maintained.
Consultation with SFF.
Kingfisher Bulletin.
Notice to Mariners.
SimOps plan in place.
Permit to work required. Optimise vessel use.
Low
