UNITED SPATES DEPARTMENT OF HH INTERIOR

MINERALS MANAGEMENT RVIC8

CSv.lt ot Maxico OCS Region

Naw Orlaana, Lou. iar. >

FINAL

s m SPECK :c ENVIRONMENTAI, ASSESSMENT

BNDANGERBr: SPECIES/STRUC, RB REMOVALS

Noa. BS/S8 93-043, 93-044, and 93-045

Struct re-Removal A c t i v i t i a a

ugene i s l and Ar« i . Block T24, Leaae OCS-G 5504

;th Timbai ler Area, Block 156, Leae* OCS-U 2928

•iouth Marah Axea, Block 3P, Leaae OCS-Q 5456

A p r i l , 199 2

BtST AVAILABLE

UNITED STATBS DEPARTMENT OP THE INTERIOR

MINERAI -IAN AG EMEN" SERVICE

Gult Mexico OCS Region

New Orleans , Louis iana

PINAL

S I T E - S P E C I F I C ENVIRONMENTAL ASSESSMENT

ENDANGERED SPBCIBS/STRL-TURE REMOVALS

Noa. BS/SR 93-043. 93-044. and 93-045

Assessment of I a Bnvironmental Impacta of the Proposed Removal of Caiaaon No. 2 in Bugene l a l a n d Aree, Block 224,-

Platform A i n South Timbal iar Aree, Block 15©; and Caiaaon No. 2 i n South Marah la land Area, 31ock 38

Leaaea OCS-G 5504, OCS-G 2928, and OCS-G 5456, R e s p e c t i v e l y By Amoco Production Company

Date S u b n i t t e d : Pebruary 22, 199 3 Commencement. Date: J u n e / J u l y 1^93

. r e v e r e d by Susan B. Gaudry

FINDING Or SIGNIFICANT IMPACT

I have conaidered the proposals by Aaoco Production Ccespeny to

remove Caisson No. 2 in Bugene laland Area. Blocic 224

(OCS-G 5504); Platform A in South Timbalier Area, Block 156

(OCS-G 2928); end Caiaaon No. 2 in South Marah laland Araa,

Block 38 (OCS-G 5456); SSA Noa. BS/SR 9J-043. 93 044, end 91 045.

Baaed on the environmental enelyeie and mitigative measures

contained in the e i te -epee i f ic environmental assessment, tbvre ie

no evidence to indicate that the propoeed actiona wi l l

s ignif icantly (40 CFR 1508.27) affect the guality of the huaan

environaent lf the permit a/appl ications are approved subject to

a l l the mitigative meaauraa. Preparation of an environmental

impact etet assent i s not required.

i i

TABLE OF CONTENTS

PAGE

FINDING OP NO SIGNIFICANT IMPACT i i

INTRODUCTION AND BACKGROUND 1

I . DESCRIPTION OF THB PROPOSALS AND NBBD FOR THB 1 PROPOSALS

A. DESCRIPTION OF THB PROPOSED ACTIONS KITH 1 MITIGATION

B. NBBD POR THB PROPOSED ACTIONS 2

XX. ALTERNATIVES TO THB PROPOSED ACTIONS 2

A. NON REMOVAL OP THE STRUCTURES 2

B. REMOVAL OF THE STRUCTURES BY ALTERNATIVE 2 N N-EXPLOSIVE METHODS

C. REMOVAL OF THB STRUCTURES AS PROPOSED 2 WITH ADDBD MITIGATION

I I X . ENVIRONMENTAL EFPECTS, SOCIOECONOMIC CONCERNS, 3 AND OTHER CONSIDERATIONS

A. PHYSICAL ENVIRONMENT 3

1. Environmental Geology and Geologic 3 Hazarda

2. Meteorological Conditione 3

3. Phyaical and Chemical Oceanography 3 a. Phyaical Oceanography 3 b. Chemical Oceanography 3

4. Water Quality 3

5. A i r Quality 4

B. BIOLOGICAL ENVIRONMENT 4

1. Coaatal Habitats 4

2. Protected, Endangered, and/or 4 Threatened Speciee a. Birde 4 b. Marine Memmele 4 c. See Turtlee 5

PAGB

3. Birds 5

4. Ssnsitivs Marine Habitats 5

5. Offshors Habitata and Biota 5

C. SOCIOECONOMIC CONCERNS 6

1. Employment 6

2. Economics 6

3. Onehore Support F a c i l i t i e s , Land Use, 6 and Coaotal Communities and Ser-/ices

D. OTHER CONSIDERATIONS 6

1. Commercial and Recreational Fiaheriea 6 a. Commercial Fiaheriea 6 b. Recreetionel Fiaheriee i

2. Archaeological Reeourcea 7

3. Militery Use/Warning Areaa and 7 Exploaive Dumping Areaa

4. Navigation and Shipping 7

5. Pipelinee and Cablee 7

6. Other Mlnerel Reeourcea 8

7. Human Health and Safety 8

E. ABLE ADVERBB IMPACTS 8

IV. PUBLI ION 8

V. CONSULT; 1 . JN AND COORDINATION 9

VI. BIBLIOGRAPHY AND SPECIAL REFERENCES 10

V I I . PREPARERS 1 2

V I I I . APPENDICES *1

A. AJ40CO PRODUCTION COMPANY CORRBS1 OND ENCE 14

B. NMFS CORRESPOND ENCE 50

TABLE 1 - EXPLOSIVES PROPOSED BY THE OPERATOR POR THB 11 STRUCTURE REMOVALS IN EUGENE ISLAND ARBA, BLOCK 224; SOUTH TIMBALIER ARBA, 9LOCK 156; AND SOUTH MARSH ISLAND ARBA, BLOCK 38

INTRODUCTION AND BACKGROUND

The purpoee of thte S i t e - S p e c i f * z Environmental Assessment (SEA) i s to eseeee the s p e c i f i c -impacts esaoc iated with proposed structure-removal a c t i v i t i e e . The SEA ie beeed on » Programmatic Environmentai Assessment (PEA) (USDOZ. MMS, 1987) which evaluates a broader spectrum of potent ia l iir.pace r e s u l t i n g from the removal of s t r u c t u r e s , e . g . , p l a t f c n . / c a i s s o n s across the C e n t r a l and Western Planning Areae < hs Gulf of Mexico (GOM) Outer Continental S h e l f . The F ^ A / S -roceee i s designed to s i m p l i f y and reduce the s i z e of enviionmental assessment documents by e l i m i n a t i n g repet . t i v e discueeione cf the same i s s u e s . This SEA conforms to he MMS and other appropriate gu ide l ines for preparing environmental assessments by u t i l i z i n g da ta presented in the PBA to complete the assessment. I t preeente s i t e s p e c i f i c data regarding the propoeed s t r u c t u r e removals and evaluates the removals' po tent ia l impacts. Preparation of t h i s SEA has allowed the determination of whether a Finding of No S i g n i f i c a n t Impact (PONSI) i s appropriate or whether further assessment of the proposals ie neceeeery.

Z. DESCRIPTION OF THB PROPOSALS AND NBBD FOR THB PROPOSALS

A. DESCRIPTION OF THB PROPOSED ACTI0N3 WITH MITIGATION

Amoco Production Company hae eubmitted propoeele to remove Caiaeon No. 2 in Eugene l e land Aree, Block 224 (Leeee OCS-G 5504); Plat form A in South Timbal ier Area. Biock 156 (Leaee OCS G 2928); and "aieeon No. 2 in South Mareh le land Aree, Block 8 (Leese OCS-G 5456 . Theee a tructuree ere located in water depths that range from 90 feet to 174 feet end are located 29 to 57 miles o f fahore the Louieiana Coaat. The operator plana to uae Compound B i n bulk exploaive chargea to aever tha two ca i s sons and t h e i r caa ing s t r ings and the four l ege /p i l ee of M a t form A and three conductore/caaing a tr inge eeeocieted with the platfonn et a minimum of 16 feet below the mud l i n e . The three anchor p i l e e at each caiaeon loceted in South Mareh le land A r e a , Block 38, and Bugene lelend Aree, Block 224 w i l l be mechanically pul led and removed. See Table 1 for a p e c i f i c data regerding the exploe ive removal operatione.

Refer to Appendix A for the etructuree e p e c i f i c a t i o n a . a d d i t i o n a l data on removal techniquee, typee end quant i t lea of exploaivea to be uaed and sequence of evente.

MI: JATION

Refer to the operetor 'e propoeale (Appendix A) for mi t iga t ive meaaurea propoaed to reduce the l i k e l i h o o d of death or i n j u r y to eee t u r t l e e end merine mammals.

B. NEED FOR THE PROPOSED ACTIONS

A diacuaaion of the l ega l and regulatory mandates to remove abandoned o i l and gaa a t r u c t u r e a from Federal watere can be found i n the PBA referenced i n the Introduct ion. The atructurea ere be ing removed becauae the welle are depleted and have no future ut i l i t y .

I I . ALTERNATIVES TO THE PROPOSED ACTIONS

A. NON REMOVAL OF THE STRUCTURES

An a l ternat ive to the propoaed a truc ture removaia aa o r i g i n a l l y submitted i e non-removal. Non-removal of the a t r u c t u r e s would repreeent a c o n f l i c t with Federal l ega l and regulatory requirement a, which mandate the t imely removal of obeolete or abandoned e tructuree within a period of one year a f t a r tennination of the leaee, or upon termination >t a r i g h t of uae or easement. T h e r e f o r e , non-removel doee not appear to be a v a l i d a l t ernat ive .

B . REMOVAL OF THE STRUCTURES BY ALTERNATIVE NON-EXPLOSIVE METHODS

The MMS hae diecueeed varioua s tructure-removal techniquee i n the Finel Environmental Impact Statement (FBIS) for propoeed O i l and Gas Leaee Se lee 123 and 125 (USDOI, MMS, 1989) and the PBA referenced in the Introduct ion . Updated information i e eleo found in the F i n a l Bnvironmental Impact Statement for Salee 139 and 141 (USDOI, MMS, 1991) . I t waa concluded thet the moat e f f e c t i v e methoda of a t r u c t u r e removal are the uee of exploeivee, e i t h e r bulk or ahaped chargee, and underwater arc c u t t i n g . Other methoda appear promieing, but require a d d i t i o n a l development to e o l v e the operational and l o g i e t i c a l problema aaeociated with theee techniquea. P r i m a r i l y for th ia reeeon, i t doee not appear t o be a feaeible a l t e r n a t i v e for the eubject s t r u c t u r e e .

Refer to the PBIS (USDOI, MMS, 1989 end 1991) and PBA referenced in the I n t r o d u c t i o n for d e t e i l e d information concerning e l t e r n e t i v e methode of e tructure removel.

C . REMOVAL OF THB STRUCTURES AS PROPOSED WITH ADDED MITIGATION

I t hae been determined that the propoeed operatione f e l l w i t h i n the category of a c t i v i t i e e covered by thn National Marine P i a h e r i e s Service (NMFS) Bio log ica l Opinion of J u l y 25, 1988, which addresses "standard" exploaive s t r u c t u r e removaia ln the GOM.

Refer to the terme and conditione of the 'generic" I n c i d e n t a l Take Statement (Appendix B) , and any mit lget ion

2

i d e n t i f i e d by t h i s SEA necessary to reduce the l i k e l i h o o d of death or injury t c sea t u r t l e s and marine mammals.

Our analyses i n d i c a t e that there is/are pipeline(s) located w i t h i n 150 meters (490 Teet? of the proposed a c t i v i t i e a . The pipeline(s) may pose a hazard to the propoaed operationa. Precautiona in accordance with NTL 83-3, Section IV.B, w i l l be taken prior to performing the propoaed operationa.

I I I . ENVIRONMENTAL EFFECTS, SOCIOECONOMIC CONCERNS, AND OTHER CONSIDERATIONS

A. PHYSICAL ENVIRONMENT

1. Environmental Geology and Geologic Hazarda

A diacuaaion of environmentai geology and geologic hazarda can be found in the PSA referenced i n the Introduction. The propoaad atructure-removal a c t i v i t i e a are not i n an araa of eediment i n s t a b i l i t y (mud flowa, slumps, or alidea). Therefore, geologic conditione are not expected t o have an impact on the propoeed atructure-removal a c t i v i t i e e .

2. Meteorologicel Conditiona

No impacta are expected ee a reeult of the propoeed a c t i v i t i e a . For analyaie information, aee the PBA referenced in the Introduction.

3. Phyelcal and Chemical Oceanography

a. Phyaical Oceanography

No impecte are expr ced aa a reeult of the propoeed a c t i v i t i e e . For analyaie informetion, eee the PBA referenced i n the Introduction.

b. Chemical Oceenography

Impacta are expected to be very low ae a reault of the propoeed a c t i v i t i e e . For analyeie intormation, eee the PBA referenced in the Introduction.

4. Meter Quality

Impacte ere expected to be low ae a reeult of the propoeed a c t i v i t i e a . For analyeie informetion, eee the PBA referenced l n the Introduction.

4

5. Air Quality

Impacta ara expacted to "be very low aa a reault of the propoeed a c t i v i t i e a . Por analyaie informetion, aee the PEA referenced in the Introduction.

B. BIOLOGICAL ENVIRONMENT

1. Coaatal Habitata

No impacta are expected aa a reault of the propoeed act iv i t ies . For analyaie Information, aee the PBA referenced in the Introduction.

2. Protected, Endangered, and/or Threatened Speciee

a. Birde

The operator hae lndiceted that they propoae to uee Fourchon, Louieiana, ee ehore beee to eupport the propoeed etructure removel e c t i v i t i e a . The PBA referenced in the Introduction delineetee eeneitive ereee elong the Texee coaetline where whooping cranee and brown pelicene could be adversely impacted by etructure-removel eupport ectivitiee. The propoeed work ia not expected to impect threetened or endengered birde or thair habitata.

b. Marine Memmele

A diacuaaion of marine mammala occurring acroae the GOM and an aaaeaament of the potentiel Impacte of etructure-removal activitiea on marine mammala can be found in the PBA referenced in the Introduction. Fritta et e l . (1983) conducted aeri*' surveys acroaa a 9,bl4 equare mile area of watera lyino central GOM. Reeulta of theae eurveye indicete thet t bottlenoae dolphin ie by fer the moat likely marine e encountered at the propoaed atructure removaia. Th obaexvers may be u t i l i z e d to look for marine mamma' o detonation of the primary charges at the removal e marine mammala are detected at the at rue-ure remove .-a, detonetlon cf the primary chargee would oe deleyed u i the animals are removed from the areee. In epite of th* ae preceutione, a low probability exiete that marine auuimaU :ould enter the blast areaa undetected and could be injurec, or killed by the underwater, subsurface detonetione. Such en occurranca ie coneidered highly unlikely and with the indicated protective mitlgetion meeeuree, the propoeed etructure-removal activitiee are expected to have only a low impact on marine mammala.

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c. Sea Turtlen

A diacuaaion of aea turtlea occurring acroaa the central and weatern OOM and an aaaeaament of the potential imparts of atructure removal ac t iv i t i ea on aea tur: lea can be found in tha PEA referenced in the Introduction. Studiea by Pri t ta et a l . (198 3) and Puller and Tappan (1986) aa well aa etrar.dlna data from the Sea Turt le Stranding and Salvage Network iTeea", 1992) Indicate that aee turtlea occur in the v ic in i ty o' -hm propoeed activit iea. Def ini t ive intormation on thc p r o b ^ i l i y of encountering aea tui t lau at tha removal aitaa durine removal operatione ia acarce. The NMFS and/or MMS obeervere may be utilized to look for 3*a turtlea prior to detonation of the primary chargea. I f aea turtlea are detected at the atructure-re.noval sites, let ona t ion of the primary chargea wi l l bo delayed until rhe animala are . emove.i from the areaa. Aa in the ceee of marine ruunmela, the poeeibility exieca that aea turtlea cculd enter the blaat areaa undetected, and co* Id be injured - ki l led by the underweter. eubeuiface datonationa. Thia occurrti .oe ia conaidered highly uni ike W, and with the indicated protective mitigation meeeures. th opoaed struccure leetoval ac t iv i t i e s ara expected ' j have or .. low impacc on aea turtlee. A cumulative ii. 'dental haa been authorized by the MMPS for actiona in thie cat ego* j.« with a l l the precaution* to be taken aa mitigating roeeeuie-i, i t ie unlikely thet ei:y eea turtlee wil l be affected by theae pjopoaed operationa.

3. Birde

Impacta ere xpected to be very low ae a reeult of the propoaed a c t i v i t i e s For analyeie Informetion. eee the PBA referenced in the Introduction.

4. Sensitive Marine Hab.tate

A diacuaaion of aeneitive marine habitata occurring in the central and weetern GOM and an aeeeeement of the potential Impacta of etructure-removel a c t i v i t i e a on theee areee can bo found in the PBA referenced in the Introduction. The propoeed activitiea are not near any aeneitive marine hebitata. Therefore, the aubject atructure removale will not impact any eeneitive marine habitete or their reeldent biote.

5. Offehore Habitete and Biota

Impacta are expected to be low ee e reeult of the piopoeed activities. Por analyaie infonnation, aea the PBA referenced in the tntr« Auction.

5

C. SOCIOECONOMIC CONCERNS

1. Employment

Impact* ~\re expected co be vory low z.m a reault .t "h * propoaed a c t i v i t i e e . "or analyaia information, aee the P»:». referencei in the Intrcdcct: on.

2. Economics

Impacta are expected to be very low aa a reeult of the propoeed a c t i v i t i e e . Por a n a l y 4 - i i f ormation, eee the PBA referenced in the Introduction

3. Onahore Support Par* .4* iee, Land Uee, and C ental Communitiea ani Serv.c a

The operator i.as indicated that they propoae to ue': Fourchon, Louieian? aa the eho.-e base to support h*- *v i -d etructure-removal ncr.ivi^lee. ho impacta are ox;#c " i \ • reeult of the n J a A a c t i v l t l w .

D. OTH. R Of K ...» jvrxom

1. «*au a»-ci«l and Recreational Pieheriee

i Commercial Pieheriee

For a i / s i a information, eee the PBA icfe^enced in the I n t r o d u c t i S i n c e the PBA wee originally written, nc- concerns have emerged concerning the impecte of explosive etruccjre removaia on reef fiah populations. On May °, U91, the GOM Fishery Management Council expreceed concern over the Jeclini^q stock' of reef fiah, eepecially red enapp*- They referred to tu* antidote] accounte of finfiah k i l l e at >ted with exploeive removale of offehore atructuree in order tr ink theee a c t i v i t i e s with t ' . . iL concerne about de'lining popula. ions of re*.f fish. They C'r: her suggested that tli* MldS should hold e l l explceive i'.rvctuts removals in abeyence u, t i l more information becomes available on the effecte of these activities on fieh etocxe. See the PBA (Section on Offehore v'*bit«cs einl Biote) fox a diec.-" icn of fieh kilxc in aseociation wit.* explooivo stricture revr.va 1•.

The MMS hae declined to ho'd a l l exploitive structure removele 1'. abeyance citing che .egulatory mandatea fox etructure removale and problems with currant non-explosive atructure removal methode. The MMS hue atated a commitment to .arry out etudiee to aaeeee the impecte of o i l and qaa etructure removalr on Guif fieheriee r e e c r ••e und che results of there etudiee w i l l be ueed to determine Cut' : * policiee wl'h reepect to theee activities.

6

The HMB continue* to cone.der tha overall Isjuawt* «f atructure removale on r nmerciel tiehing to be low. .na MM3 policy of encouraging /n active rige-ro-i^efe program will help to offeet cumulative atructure-removal Imr* ete to fieheriee reeourcee.

b. Recreational Planerie*

Iapecte ere expected t«, be low ee a reault cf r \ s pro^-u activitiee. Por analyeie infonnation, eee the PB/ .••fer,-red in the Introduction. See the preceding aection for .1 dieeueeioi. of fiah kille in aaeociation with exploaive etructvr*. removale.

2. Archaeological Reeourcee

Tepaetfl ere expected to be lo# >e e reeuit oi th* ftreposed u rtivit^'jS. Por analyaia infonr* eee the r»\ rrfeieacod in the Intinduction.

3. Ml .»

6. Other Mineral Rpjuu. -a

No ..v^cta are expected as x result of the r ..oposed activiti aa. Por Analyeie information, aae thc •'KA referenced in the tntrxluctiwn.

7. Human Health and Safety

The Pr', refe--enced in the Introduction deecribes rhe ha. aidous Jitione for workers during etructure-removal activitiee. The operator hae propoaed the uee of exploaive methode to renove the subject structuree. Exieting legel and regulatory ety reqv.i.amenta will keer *-h* impecte of the pro&tossd won: cn human haalch and safe:, *t a very low level.

T . UNAVOIDA'V S ADVERSE IMPACTS

A dis-.si.ion o." avoidable adveree 'evicts can bo found ln t.hw PBA i -renced ir the Introduction. Two areaa of ongoing

wncerr. Vive been the potentiel impact to protected, threatened, .-"1/or er ngered epeciee and potential loee of habitat to the

mariuo er.vlronment. Both topice are diecueeed ln the PBA end previouely in thia document A more vecent iseuj of concern hae eurfeced regarding the impacta of exyl' 3ive etructure removals on reef f lan stocks. Thie issue haa been previouely diecueaed ln t h i a document. Although the impacte to commercial and recre*»tione.\ fieheriea ie coneidered to be low, further etudiee information about thie 4aeue ehould be available in the future. Other unavoidab.• acc"»rte impacte are conaidered to be minor.

I V . PUBLIC OPINION

K diecueeion of public concerns regarding etructure r«r rvala * found in the PBA referenced in the Introduction.

.'. \ y 19! , t'le PCs*. P shery Ma.id je.nent Council requeeted UMK . i c KNE plac J a mjtc 101 lur over the exploeive removel ot o.'iTr.non i nucturae with t.?ree r mora, supports. Non-removal of tht.ts etiu'-tuiee vould conf l i t wltli current Pederel legel and rec j la tory requirement* which n.»- late the timely removal of abandoned or obsolete :> ructure- within a pericd of one yeer afi.«»r terminetion of the leaee, or upon termin/.tion of e right-of tee or eeeement.

The MMS believes that evrrem »*t* on the e f r * - . ' « of exploeive reeiovale on f i s h irjr:< ' i ' , ie ineutflcient ; drew any conclusions, and e moratorium or. a l but eingle pile ai.'isone at t h i a n?*' i i unjuatif ied. In orcvr o quantify expletive e f fecte MMS i . lated an interagency etudy with tho NM'- to deterr :. a titfh mt t l i t iee from pletform removal operetione. In addition to the »/v?v« etudy, the MMtf auppo.-te an a-tive rige-t?-

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reef program and encourages industry to search for method chat w i l l minimize effects or .i-»!< from atructure-removal operat.ons.

V. CONSULTATION AND COORDINATION

In accordence with the provisions of Section 7 of the Endangered Species Act, the pn.poeed structure-removel operatione are covered by ti Bi logical Opinion ieeued by the NMFS on J u l y 25, 1988, wt. ch e»cabl iehed a category of "etenderd" exploeive etructure-removal operat > u> Their comments are includes in Appendix B. The NMFS concluded that thie category of structurt removal a c t i v i t i e e wi l l not l ike ly jeopardize the continued exist- nee of any threatened >r endangered epeciee under t h e i r purview. Additionally, they concluded that thia type of "otandard" struc ure - removal act iv i t ies may result in injury or mortality of log jerhead, Kemp'a ridley, gre hawksbill, or leatherback turtlee. Therefore, they eetabliahed e cumuletlve l e v e l of incidental take and diecueeed var^oue meeeuree neceeeery to monitor end minimize rr a impact (eee Appendix B) . The NMFS noted thet no incidentel tc .'.ng of marine mammala wac authorized under Section 101(e) (5) of t o Marine Mammal Pro t e c ion Act of 1972, in connection with thie category of etructure-.'- vel a c t i v i t i e a . Therefore, taking of marine mammala by -h*. ueia< n' would be prohibited unleae they successfully apply for and obt • a waiver or permit to do eo frcn the NMFS.

V I . b:?!.IOOKAV«IY > ND SPECIAL REFERENCES

' r i t c e , T H. , A B. I r v i n e , R .D . Jenninge, L A. Collum. W. iicffmc.:., I 'd M.A. McGehee. 1983. T u r t l e * b i r d e , and mammals i n th*. no-ztitsrn Gulf of Mexico and nearby At . i n t i c waters. U .S . F i e h anu 84. Washington, D . C .

U . S . Der«utwent of the I n t e r i o r . Minerele Management Serv i ce . 1987. . ograamatic Environmental Assessment St ructure-removal a c t i v i t i e s Centra] and Weatern Gulf of Mexico claiming Areee. OCS/EA 87-0002. Gulf c : Merl o OCS Reqion, Nw% Orleene, LA.

J . S . Department of th.*. I n t e trior. Minerale Management Serv i ce . 1989. Final Bnvirorjner .a l Impact Statement. Proposed QCS O i l and las Leese Selee .23 and 125: Central - nd Weatern Plenning Ax*ae . OCS BIS/BA MMS 89-0053. Waehington, D .C . Avai lable fr-m N T I S , Springf ie ld VI.: PB89 - 314185/AS.

* . S . Department of \e I n t e r i o r . Minerale Management S e r v i c e . 1990. Pinal Envir , . e . i t a l Impact Stetement. Propoaed OCS Oii and Gae Lease Salea 3 35, end 137 ( C e n t r e l , Weetern, end E a s t e r n Gulf of Mexico) . OCS EIS/BA MMS Wo. 90-0042. Washington, D.C. A v a i l a b l e frcm the Gulf of Mexico Region or from NTIS, S p r i n g f i e l d , VA. Volume 1, PB90-273582/AS and Volume 2, PB90-273590/AS.

U . S . Department of the I n t e r i o r Minerala Management S e r v i c e . 1991. Final Bnvironmental Impact Statement. Propoaed OCS O i l and Gee Leese Selee 139 and 141 (Central and Weetern Gulf of Mex ico ) . O S BIS/BA MMS tfo. 91-0054. Wash ....-ton. D.C A v a i l a b l e 'rom the G u l f of Mexico Region iy., trom NTIS, Spr :'ngf i e l d . VA. Volume 1, PB92 -125376/ A'j and Volume 2, PB92-125384/AS.

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TABLE 1

Explosive* Propoaed by the Operator for the Structure Removals in

Bugene Island Area, Block 224; South Timbalier Area, Block 156;

and South Mar< h Island Aree, Block 38

TVPe of E x p l o s i v e -

Composition B, bulk

Number and Size ot Chirow:

One. 50-pound charge for Caieeon No. 2 and i t s caaing atring in South Marah laland Area, Block 38. iSee Note below.)

Pour SO-pound chargee (one for each of the four lega/piles of Plattorm A) and three, 50-pound chergee (one for eech of the three wall conduetora and ceeing atrlnga) in South Timbalier Area, Block 156.

Ona, 50-pound charge for Caiaaon No. 2 and i ta caaing atring in Bugene laland Area, Block 224. (See Note below.)

Employment of Ch^rgci;

Inaide, 16 faet below the mud l ine.

Sequencing of Detonat-inn•

Multiple ahota; Pour p i l i n g and three conductor/ceaing atring detonetione with e one eecond deley between eech ahot for Platform A in South Timbalier Area, Block 156.

Single Shot; both caieeona w i l l be eevered with e aingle ehot in Eugene laland Aree, Block 224 and South Mareh lelend Area, Block

M L̂SLS A. second, 50-pound charge mey be neceeeery if the 48" caiaaona are not eevered by the original chargee.

i i

V I I . PREPARERS

Author:

Susan P. Gaudry - Environmental Protection Aaa istant

Typiat :

A l i c e Sue Krit - Office Automation Clerk

12

'-' I I I . APPENDICES

A. AMOCO PRODUCTION COMPANY CORRESPOND

B. NMPS CORRESPONDENCE

13

APPENDIX A

AMOCO PRODUCTION COMPANY CORRESPONDENCE

14

UNITED STATES GOVERNMENT MEMORANDUM

1

C X 2 l - 9 3

Tot EPTlrnn—uUI Operationa Section (LE-5)

F r o a : Offioa of S t r u c t u r a l aad Teohnloal Support, Plaid Operationa. Oulf of Mexloo OCS Radon (OSTS)

S u b j e c t : Platfora aaaaaai

OPERATOI: A m r C O

C o n t r o l * , : ES/S»,^__ft S T »st> II a

Amoco Production Company

A/nuco H i , * *ng f ' u « U f h c « 8 o . ! > 0 » 7 9 Htm U r t ^ n t L o u M m W H

747 - ^3 - oO-

C t Mwftav

R E C L . V February IS, l f t 3

FEB 2 2 1993 Pilot BLM-FF on

PROPOSED OCS PLATFORM/STRUCTURE REMOVAL

I . aoaponalblo Party

A. Uaae oparator nana AflQGQ Production COBPfln*

B. Addraaa P.O. Box 50179

IBM Or I n n s , LA 70180.

C. Contact person and telephone nuaber Dele Dixon fS04/SS6-2737)

J l a FjUhugh (504/586-2708)

D. ^Shore baaa Fourchon. LA

ZI. Ideat l f l eat loa of Btruotura to be loaovod

A. Pletfora naae Euqan* laland 224 t l Quved Ceieeon

B. Locetlon (leeee, aree, block, er.J block ccordinataa>0CS-G-5!>Q4

Euoono Inland Araa. Blk 224 LSBbort COflrflinStBS

X - 1.855.078,4' Y - -20.fta?.02'

C. Date inatellad (year) l l f i i

D. Propoaed dete of reaovel (Month/Yeer) Juno 1993

E. Water depth 135 foet

I I I . PjMBJLiAteB 9t StrawtUXB tP fcj BaeOVld

A. Cc i i -o»»r»tion (ettech a photograph or a diagram)

Sis Atuchbsnt 1 B. Size Main Df * 9' « 14'

C. Nuaber of legn/casings/pi1inga 1 Calaaon/wall conductor

0. Diameter end well thickneee of lege/caeJnge/pilinge

CaliiorTlt 11* prlva pipe ac, Conductor i&IL. Surfaca CBIxnj lfl a/4"

E. Are pilee grouted? N/A Ineide or outeide M/A

P. Brief description of a ' conposition end condition

Q-lSQ' vary sort, to stiff cliv

Buxpose

Leeee expiration dete end reeeon for removing the atructure Well

ia doplitid and fan no future utility*

itapYil Method

A. Brief deecription of the aethod to be ueed Exploaiva

B. If exploaivee ire to be ueed, provide the folloving:

1. Kind of exploeivee Comp. B

2. Nuaber end sizea of chergee **f A*»*qhMfflti 2

^

e. Single ehot or aultiple ahc-a? ainoia

b. If aultiple ehote, aequence end tiaing of

detonetione N/A

v);8

3. Bulk or ahaped charga? B_lk

a. Oapth of datonatlon balow audiine 16* minlaun

b. Inaida or outaida piling? Inaide

Pre-removal aonitorlnr *-nchnlques

1. Ia tha uaa of ar i**e chargaa or aeouatic devices proposed?

W/A

I f yea, provide the following:

e. nuaber and kind H7a

b. Sixe of chargea H/A

c. Brief deecription o.' how, where, and wnen ecare

chargea or aeouatic devicea w i l l bo uaed w/A

2. Mill divera or aeouatic devices be uood to conduct a pre-

removal aurvey to datact preaence of turtlee and aarina

mammala: Onlv in conjunction with diving required to

prepare tha atructura tor abandonment.

Post-removal aonitorlng techniques

1. Mill trenaducera be uaad to aeaaure tha preaaura and

impulae OJ the detonatlona? Mo

2. Will div* '-. be uaed to aurvey the araa after reaoval to

det*?r»:ne any effecta on aarina l i f e ? Only in

ccnnact.cn with dlvlno required for the cc»-lotlon of

uiaciopm abandonment. i

4

V I . ainiooleal InforB-tiOB

I f evelleble, provldo tho re«u.*a • f »r.y rdOtwt bioioqical eurveye

ci "lucted in tho v i c i n i t y of tho e t_»c ture . I f eveilablo, describe

any recent obeervetione of turt le* or eerine raeaaala at the

etructure Bit3.

-Jlii- —

PLBABB 8END THREE COPIES 01 TBB APPLICATION TOI

Regional Supervleor, Field Operetione (OSTS) Minerale Management Servica 1201 Elmwood Pa.k B.-.d. Nov Orleana. LA 70123

• I , | r

95 • T — r

TEXAS

/90'

/

( MISSISSIPPI

A-

\ LOUISIANA /

ALABAMA

B £ S r^/UBtEC0rY

Amoco P r o d - c t l o n Compony V I C I N I T Y MAP

.U6CKC ISLAND BLOCK 224 0 " S H O R E F_D_»Al _0'..: • £ > A N A

T i t l e Survey 0«

Scai»» l" • iOO - ' Dote* 4 - 2 - - M *

WELL HEAD DK, (•) 25'

EQUIP. OK. IB'

NAV AIO 2-CAN8. )

(2)2 \ /T 0 MIRE MPE9

FIGURE NO. 1.

ATTACHMtJiT

022

FIGURE NQ. 2 ANCHOR PILE PLAN

3.73

Aaoco Production Coapany Eugana laland 224 Wall #2 Guyad Caiaaon

Propoaad OCS Platfora Raaoval

Attachaent 2

Eugene laland 224 Wall #2 Guyad Caiaaon - Wall Conductor Data

OCS-G-5504

JU PflgrlBtlPB 91 Calaaoa/gnadu-tara fc© bd

I S 1 Conduoto.fs tfi BB F SMB Till

BI 224 #2 40" Caiaaon 3CP IS" (14.0 l b / f t ) -0 3/4" (40.5 I B / f t ) (Al l atrlnga axcapt tha 41" appear to ba groutad)

IXx PflOriPtlOB c 1 Anchor PJUlA tS BB Ba_BB—a_I

•4

EI 224 #2 (3) - 42" x 1" x 70' (Anchor Pilaa w i l l ba mechanically pullad and removed.)

'AO °4

Aaoco Production Coaptny Eugene Islend 2?4 Well 02 Guyed Celaaon

Propoeed OCS Platfora Raaoval

Attaehaeat )

Eugana laland 224 Wall 02 Guyed Celaaon - Exploalvea Oata

OCS-G-5504

iW TJJUSJ Alan as fApjioajLysi

•fell Conductor*

a. EI 224 Well 02 1 - 50 Lb charge

Note: A aecond so lb charge aay be neceaaary if the 48" caiaaon ia not aevered by the original charge.

0 Amoco Production Company

Amoco auHdiny Port Othe* Horn b0_ 79 Nrw Of tail A lowumn* 701 HO

I L Madhry M a r ' ^ r * Unarm

February I S , 19 9 3 R E C E I V E D

P i l o t ILM-PP FEB 111993

Mr. D. J . Bourgeois

UNO « AructurS ani TectNMcal Support

Regional Suporvisor Minerals Managamant Sorvico 1201 Elmwood Park Blvd. Mow Orleans, LA 70123-2394

Doer Mr. Bourgeois:

Proposed P l e t f o r a Removal OCS-Q-2928

south Tla-alltr ali rli.ton.

Per 30 CPS 2S0.143 Aaooo requoete epprovel to reaova tha South Timbalier lse Platfora. Bnolosad ere three oopiee of tbe application to reaove thie 4-pile pletfora. Amoco baa no future uee for tbie etruoturo.

We ere requeet ing epprovel for the uee of exploeivee. Each individuel exploeive cherge will involve so pounde of bulk exploeive.

Should you nave questions or need edditionel inforaation, call Dele Dixon et (S04) 544-2737. aaooo plene te perfora the reaoval ia May, 1993. We look forward to your early aad favorable response.

Sineerely,

JTPirsb

Attachments

*

PROPOSED OCS PLATFORM/STRUCTURE REMOVAL

i . •••PvailP.i Party A. Lama* oparator naaa Aaoco Production Coapany

B. Addreaa Ptg,_BQ„ 5Q67? _

MMM Qrlaans. LA 70130. C. contact paraon and talaphona nuabar Dala Dixon (504/586-2737)

l i l flUhuqh (5W4/-----70?) D. Shore baaa fourchon. LA

I I . IfliBtlllQltiQQ p£ ttOBTaMBl l l b l KtBvVtd

A. Platforn nana f^ l t t T lBva l i i r 156

B. Location ( laaaa, area., blcck, and block coordinates)OCS-G-2928

South Timbal l a ^ r a a . Blk 156 . Platf o^^oborT^rSbrdlnatea

369,178 X=JJLUA

C. Data instal led (yaar) 1978

0. Propoaad data of raaoval (Month/Ynar) July 1993

E. Watar d e p t h ^ l ? ! f l i t

I I I . Daacription of atructure to bo Baaovod

A. Configuration (attach a photograph or a diagraa)

Sss Attachment 1

B. Size Hlin PBCK 78' X IQ4' St MB in PICK Jackat 92.,5' x 92,5' at thi audilna

\ \ C. Nuabar of lega/caeinga/pilinga 4 loaa. 4 pil inaa

3 conductors

s.

2

D. Diamater and wall thicknaaa of legs/ceeinga/pi1inga

Laaa - 52" x 1.00" WT t Surface. 52.75" x 1. 375" WT j Mudlina

PilSS - 48" K 1 25" WT 16' PClOV MUdllni

Conductors - ass Attichaint l

E. Ara pileo groutad? f'ji Inaida or outaida WjJk

F. Briaf daacription of aoll tion and condition

0-134' Soft to vary atiff a

I V . Purpose

Laaaa axpiretion data and raaaon for reaovlng tha atructura Tha

lssss vas rilaaaad t.Q tnt ms on a/li/la. Ths wills srs asp lit id " aiid_ths_otructurt hss no future utility•

V. laaoval Mathod

A. Criaf descr pt ion of tha aethod to be uaad Exploaivea

B. axploaivaa ara to be uaed, provide tho following:

Kind of exploaivea coop. B

2. Nuaber end elzoa of chargea Sea Attachaent 3

a. Single ahot or aultiple ahota? Multiple ahota

b. I f aultiple ahota, sequence and tiaing of

datonationa There w i l l be one aariaa of datonationa

conaiatlng of 4 pilee a 3 conduetora. In thl

aeries there wi l l be a ono aecond tiolng lnLarval

bgtvwtn detonat. onst

W. 0

3. Bulk or ahaped charge? Bulk

a. Depch of dotonetion balow midline 16' alnimm

b. Inaide or outaida piling? inmld«

Pro-removal aonitorlng techniquea

1. Ia tha uae of acara chargea or aeouatic devicea propoaad?

No

I f yee, provide the following:

a. Nuaber end kind HJA

b. Size of chergee tUA

c. Brief deacription of how, where, and when ecere

chargea or aeouatic devicee w i l l be ueed w/A

2. Will divera or ecouetic devicee be ueed to conduct e pre-

removal aurvey to detect preeence of turtlee end aerine

aaaaala: Only in conjunction with diving required to

Prepare for jbj ndonmoi —

Poat-raaoval aonitorlng techniquea

1. Will tranaducera be uaed to neaeure the preeaure end

lapulae of the detonationn? Mo

2. Will divere be i .1 to eurvey the eree eftar reaoval te

deteraine any affacta on aerine l i f e ? Onlv in

SgrmffCtlQn With divine required far trnMrnliimmM

bletfora abend?naent.

4

vi. lialigtflU laroraitloa I f available, provide the reeulte cf eny recent biological eurveye

conductad in the vicinity of the etructure. If evelleble, descr. •?

eny recent observations of turtlaa or aarine mammals at the

etructure t i t a .

BTA

PLEASE 8BMT THREE COPIES OF TBB APPTICATION TOI

Regionel Superviaor, Pield Operations (OSTS) Minerele Managenent Service 1201 Elmwood Park Blvd. New Orleans, LA 70123

030

. I : t 1 i i t . , f . *• It 'Ot 3' *H . 10*'* I* 001 "0.0*0.10' '

'01. IJ' *l

T

I CCS o c««*

II"3 O* 00)0 00*ii St tl'

152 157

ISO ' 10*10 so'ott 00*ii tO'000

JUttUX 153 IS«

. l l ' t 01. etorto *0mr

,< to*trt4~ttt »t 0t''OS0'rtt l.lf.ioril

• 11 Itt 't tt \ » • • It Jit *o *

. . • - t M * " 0*' WT

181

. 1 00* ItOS't0t i**f 00*00Ut ''00

154 155

5 . ^ 'At. V fy

182 .#» It* I f I r 10* 10*0 00*00'01*000

MO Tt til §00*100ftmt Oil ft* oro 00100 OOfOo LO fto* Co0rt SrotO't^tmjy'fi »*«v»#. **>ttt '*Oieom0 of

AMOCO • • O O ' - . C ' O N COM^AHY N t * e - N S . LOUISIANA

LOCAT:O«« »LAT

"A" PLATFORM CCS G-2928 BLK 156 SOUTH 7IM8ALIER AREA

_ : 0 ' S ANA 0 " S H C » € C • A * ' C H t '

Q (fe, 4S'.QM V

ROW-182

g>..U)8S'-0*

gL.M'3'-€" - t L . M l Q ' . r >

a . E L ( r | ' ^ , - Q , , ( e

PROPOSEO Of t iLUNG ANO PWOOUCTJON PLA7F0PM SOUTH TifABALlEP.

o o ROW-ASB

AMOCO PRODUCTION CO.

-ceo Productio- Coapr.nj S< n Timbalier 2 fi P l . i t fo rm

Proposed OCS F' . t f o m Rer. i l

Attachaont 2

south Timbalier 136 Platform w . l l * . Condt to r

ix PfigfipUoD al QkslMJkaiij caMô Qr̂ ^ bt atac-vta

1 1 1 1 C0DflUgt9ri t o fee Rajno/fd

ST 156 A-1 20" 16" 10 3/4- (40 5 IB/ft) (All strings ippoar to ba groutad)

ST 156 A-2 20" 16" 10 3/4" (40.5 lb/ft) (All ttrings appear to bo groutad)

ST 156 A-3 20" 16 10 3/4" (40.5 lb/ft) (All atringa appear to bo grouted)

Amoco Production Conpany South Timbal ier 156 P l a t f o r n

Propoaad OCS P l a t f o r a Raaoval

Attachaent 3

South T i m b a l i e r 136 P l a t f o r a Walla - Exploaivea Data

OCS-G-2928

I x PSIOrlBtlQB ft* barnloalvoa

V a i l Conduetora

a. ST 156 Well A-1 1

b. ST 156 Well A-2 1

c . ST 156 Well A-3 1

\

50 Lb charge

50 lb charge

50 lb charga

Jackat P i l a a

a 4a" x 1.25" (4) 4 - 50 Lb chargaa

^aVfatat Amoco Production Company OHWvx* 8 u u n « M Unrt Amoco Bui lding • » o « O r h c » B o « S 0 8 7 9

O f l M n i Lou ..anm 70150

February 15, 199 J t I V E D

F i l a i ELM-P F FEB 2 2 1993 Ones tt Struck**

ai fatnaal fceaert Mr. D. J . Bourgeois Raglonal SupervAaor Minerals Managamant Servica 12 01 Elmwood Park Blvd. Mow Orlaana, LA 70123-2394

Dear Mr. Bourgeoiai

Fropoaed Platfora Reaoval OC1-0-S4S* South Marah Ialaad 31 Well #2 Guyed Caiaaon

Per 30 CPR 250.143 Amoco requests approval to reaove the South Marah laland 38 Well #2 guyed oeiaaon. Enclosed ere throe oopiaa of the applieation to reaove thia guyed caiaaon atructura. Aaoco haa no future uae for tbla atruoture.

We ara requesting approval for the uae of exploaivea. Eaoh individual axploaiva charge w i l l involve 50 pounda of bulk explosive.

Should you hava queationa or need edditionel inforaation, e a l l Dale Dixon at (504) 586-2737. Aaooo plana to parfora tha raaoval in May, 19*3. Ve look forward to your early and favorable reaponae.

Sinoerely,

JTPjrsh

Attachnents

PROPOSED OCS PLATFORM/STRUCTURE REMOVAL

i . Rttponilblf Ptrty

A. Lease operator nane Amoco Production Company

B. Addresa P.O. Box 50879

NtW Orleans. LA 7Q15Q

C. Contact person and telephone number Dale Dixon .'304/586-27371

Jim Fitzhugh 1*504/586-2709)

D. Shore base Fourchon. LA

I I . idtntiriciUoa qt ttructurt to be BfOYttf A. Platform name South M ;rsh laland 38 #2 Guved Caiaaon

B. Location (lease, area, block, and block coordinates)QCS-G-5456

South Marah Island Area. Blk 38 Lambert Coordlnatea

X 5 1.79S.474.79' X - 44.lg4.Qt'

C. Date insta l led (year) 1990

D. Proposed date of ramoval (Month/Year) July 1993 \

E . Water depth 90 feet

I I I . Description of Structure to be Beeovod

A. Configuration (attach a photograph or r diagram)

Stt Attachment 1 B. size Main PicK UJ x 20'

. ^

C. Number of lega/caainga/pilinga 1 CslBSOn/Wtll conductor

D. Diameter and wail thickness of legs/casings/pilings

Caisson 48" x 2". Driva Pipe 30". Conductor 16".

Surtact caaing-lfi-i^

E. Are p i les grouted? N/A Inaide or outaide N/A

F. Brief daacription of aoil coapoaition and condition

Q-64' very •ott-vv-fira clay 64'-lQ7' Ytry l l l t Y Clay

Purpoaa

Leaae expiration data and raaaon for removing the atructura Wall

l i dcplitid and Lal no future utility.

Mao vai Method A. Briaf daacription of tne method to be uaad Exploaivea

B. If axploaivaa ara to be uaad, provide the following: \

1. Kind of exploaivea Comp. B

2. Nuaber end sizes of chargea S l l Attfl tlffiint 2 .

a. Single ahot or multiple ahota? Single

b. I f multiple ahota, aequence and timing of

datonationa N/A

\ 3. Sulk or shaped charge? BulK

a. Depth of detonetion below nudline 16' minimum

b. Ineide or outside piling? Inaida

C. Pra-reeoval monitoring techniquea

1. Ia the uee of acara chargee or acouotic devicea propoaed?

H/A

I f yes, provide the following:

a. Nuaber and kind H/A

b. Size of chargea W/A

c. Brief description of how, where, and whan acara

chargaa or acoustic devicea w i l l be uaed N/A

2. H i l l divera or aeouatic devicoa be uaed to conduct a pre-

removal aurvay to detect preaence of turtleo and aarine

naauala: Onlv ln conjunction with diving required to

propart tnt structurs for abandonaant.

0. Post-removal aonitorlng techniques

1. Will transducers be ueed to measure the preaaura and

iapulee of tha detonetione? No

2. Will divera be uaed to aurvay the area after raaoval to

deteraine any effecta on aarina l i f e ? Only in

connection with diving required for tno completion of

platicrn afaaOdaaawitj

vJ SO

4

V I . m\s>\ Q

If availabia, provida tha results of any ra- c'ological aurvaya

conductad in tha vicinity yt tha * rue*-"-.'. If available, daacriba

PL EAS 2 8 END THRE" COPIF> OP THV APPL I '\2 OM TOt

Regional Suparviaor, Fiald Oparationa (OSTS) Minarala Managamant Sarvica 1201 Elmwood Park Blvd. Naw Orlaana, LA 70123

any racant obaerva doi » of 'ai'T ii « "taaaa la at tha

atructura a i t a .

OIL

041

J42

SCJTH WIAHSM ISLAND BLOCK 31 F l C L O

Amoco Production Comoooy vTctMlTY MAP

PROPOSED CAISSON FOR OCSG-S45* »CLL

[Title Survey I

NO. I QFf SHOP.C 16EW I A PA»tSK

ioa i t i # » '00 O f . 0 t / 0 V » 0

LA. T 05*? ' ( iOO. 33 S>

OCS-G-0780 33 AAIOCO-TEXACO

P+orostO CAISSON OCS C-54K.HU HO.i iSUftf.LOO

r • 44.isr.i9 _ t - l . rf5.45i.54 (Tt u t . • N 4T it.sr m tone. - frit/or.or

r • I0.445.ili.4t M • i. tro.ttr.55

o

U.T.M.

38 OCS-C-545S

AMOCO

iSOC •C PLATFO**

(rWtOVfOl

47

i)"3 (»*A0 27)

**••< f t*

Mnoco Product I on Compony Title Survey Oee LOCATi ON PLAT

PROP05PJ) CAISSON rOR OCS-G-54S* WCLL NO. 2 SLANO SLOJK St fHEJLO OrrSHOWC ISCPM PAPISM.

Seeic* 2000

LA. 05*7, r 300. J J f M i "

T P S . WELLHEAD DECK EL.C •> 28' -0* T O S. EQUIPMENT DECK E L . ( T ) 19' -5 1/4'

CAISSON CUT OFF (•) lfl!

M.L.W. 0'

TERMINAT.ON CLAMP (-) 10' -Q*

Ki. AID

J T — 3 0 8 -BOAT LANDING

*g LIME aj-> tt-Q'

A. ACHMEN7 NO,.

EISUBE NQt 1 ASSEMBLY REV A: ION

AMOCO PRODUCTION CO. SOUTH MAftSH ISLANO 38 12

G44

ATTACHMENT NO.

EI6URE NO. 2 ANCHOR PILE PLAN

AMOCO PRODUCTION CO. SOUTH HARSH ISLAND 38 12

Amoco Production Coapany South Marah Island 38 02 Guyad Caiaaon

Propoaad OCS Platfora Roaoval

Attachment 2

south Marah laland 38 #2 Guyad Caiaaon - Mall Conductor Data

OCS-G-5456

; U P f .nr lDt lon p l C ^ j j t p ^ p a ^ j i o l p x i *fi MM MMMMIMA

njk\X conduetora &fi bt iMatMsl

SMI 38 02 Caiaaon

JO" 16" (84.0 lb/ft) 10 3/4* (40.5 IB/ft) ( M l atr inga axcapt tha 48- appear to ba groutad)

I T . bgporlotion ftf aMi^S *U«n iM MM iaVflZta

i a # 2 i i i - 48" x 1" x 65' (Anchor Pilea w i l l S M I 3 * ' * 1 ' be t^chanically

pulled and removed.)

\

I j

I

!

•547

911 08

)C-r79b°eZ.

Q. Ik

If-

1

049

APPENDIX B

NMPS CORRESPONDENCE

#

UMITIO «TATHt OM-lfMINT Qf. Ma'tensl O C M M C A»m»»phtr.« Ad-r..r.« . t on

^..•--3-or o r M t * |

JUL 2 S 553

Mr. Wil l iam 0 Bettenbere D l r e c t o r Minerals Manageaent Ssrvics U.S . Depertaent of ths Intsr ior Waahington, D C 2024u

Daa Mr. Ssttsnbsrg:

Snelossd is ths Slologicsl Opinion prspsrsd hy ths National Marlra Piahariaa Ssrvlcs (MMPS) pursusnt ts Ssction 7 of ths endsngsrsd Species Act (SSA) concerning potent i s l ispscts on andangarad and thrsstsnsd apaciaa aaaoclated with renoval of cer ta in e l l and gas platforaa and rs ls tsd atructuree In tha Oulf ef Menico (OOM) using sapleeivss.

Thie "standard" conaultatlon covers only theee reaovsl operstions that aeet specified er l ter ia pertaining te the else of eaploslvs cherge used, dstonstion depth, and nuaber of blaata per atructural grouping. Coneultatlon auat be Initiated on a case -by-caaa seals for e l l disaentllng operstions requiring the uaa of aap lor vee that de not aeet the established c r i t e r i a .

MMPS co- >; .ist atructura reaovsls In ths OON thst f s l l .witn' ra II. 1 lshsd e r l t s r i s srs net l ike ly to jeopardise the cer - ince ef l ieted speciea under the jurisdiction sf MMPA it i a our eplnien that, tha proposed ac t iv i t i e s aay . .» . tha Injury er aortallty ef endangered snd t h r e a t . . . / t u r t l e e . T h s r s f o r s , purauant te Sect ion 7 (b) (4 ) of Uie ISA, w araa establiahed s lev level af lneidental taka. which la cuaulative far a l l reaovala eovered by this coneultation, ani terae and conditions necessary te a in ia l te snd aonitor any laps ete, ehould tbey oeeur. The terse and conditiona ara contained ln tbe encloaad incldantal taka atateaent. Uae eneloeed ia a l i s t af pending eonsultstions that aeet. with nated exceptlona, the e r l t e r i a sstsbllshsd in ths "standard" ssnsultst ien. This biological eplnien and tna a l t l ga t lng aeaauraa and terae and conditione contained in the re le ted incidsntal taka eteteaent apply te theeo prepeeed reaoval operationa. Therefore, formal cenaultatien ia concluded for thess propoaed aet lens.

"* W a r * S u f mat /Aear i t t % Pr.*;rf t» • l f } V 1 * f l

Consultation sust be reinitiated If: ( l ) tha aaount or aatant of taking apacifiad in tha incldantal taka atataaant la exceeded; (2) naw lnforaetlon ravaala iapacta of tha proposed activitiaa that aay affect liatad apaciaa in a aanner or t i an extent not conaidarad thus far ln our opiniona; (J) tha

entified activitiee are aodifiad ln a aanner that cauaaa an ..uveree affact to l l a t e l apaciaa net previously conaidered: or (4) e new apaciaa le liated er critical habitat la deaiqneted that aay ba affected by the projeet. *

I look forward to your certlnued cooperation In future coneultationa.

Sincerely,

e\ Brennan / / a a l a t e n t Adalniatrator v far Piahariea

enclosures

G52

tiological Opinion

Agency: Minerala Management Sorvico, U.S. Department of tho Interior

>c xvlty: Conoultotion Cor Removal of Certain Outor Continental shalf oil and Gaa Structures ln the Gulf of Mealee

eonsultstion Conducted ay: Nstionsl Narine Piahariea Service (NNPS)

Date Issv. : i

background Inforaation:

Zn a lsttsr dstsd Neveabar It , ISSS, the Mineral* Menegeaent service (MVS) aaaa an i n i t i a l rsevest for foraal consul tst ion pureuent te Section 7 of the Sndsngsrsd sped s Aet (tta) for the reaevel of sn offshore o i l snd gss platfon loeated in the Pederal vstsrs of the Oulf of Mexico (GON). NKS and NNPS deteralned thst rsaoval of oil snd ass platforms snd rslstsd structurss ln ths OON aay effeet endenaered snd thrsstsnsd sarins spociss. This "aay effeot" determination vaa bassd on s poeslbl relationahlp batwaan sndsngsrsd snd threatened ees turtls mortalities snd the diamantling ef plstforas using sxplosives. On Novsabsr 13, l t t t , NMPS issued the first of a series af biolojiesl oplnlona addressing, in detail, tho potential iapacta to liatad asrins apeciea thst msy oeeur ss a reault of OCS abandonaent activitiss.

MMS and MNrs aatabllahad procedurea foi expediting f'.tjon ? consul tst isns SO platform abandonaent activitiea in th OOK rsfsrrsd ts as "expedited consul tat lona. • Polio* lng • oaa proosdurss, approx lately 44 coneultationa hava been completed for raaoval operat., a in f a GOT rsgion. All af the coneultationa have wneleded that the propoeed abandonaent sctivltiss wsrs not likoly to jeopard lie the ec* inuwd exleter.ee of sny listsd speclss, but thst ths propoeed se. vitiss msy rssult ln ths lneidental taking ef endsngsrsd snd thrsstsnod ses turtles.

Thi dismantling of platform* and ralatad atructuraa ualng axploaivaa haa evolved to a point where a -atandard" protocol can te eatabllehed for ramoval oparationa resting certain criteria Bated upon raaoval techniquea developed and reviewed in conjunction with the previouely conducted "expedited conaultationa," MMS haa requeated, by lattar of May 24, I9ia a "generic eonaultation" that would be applicable to a l l future' removal oparationa that fail within a diet met category, defined by specific paraaatara. A catego.y haa been dealgnad to include thoaa atructure typaa and raaoval -schniques aoot coaaonly ancountarad during tha expedited coneultationa and dlaaantllng oparationa already coapletad. since approxlaately looo atructuraa that aay be acheduled fer future reaoval fell within tae paraaatara of the eatabllahed category, MMPS agraee that a "generic" conaultatlon lo appropriate at thia tiae. The objective ef the conaultatlon la to reduce tho administrative ourdan on both MMS snd MMPS for conducting repetitive eonerltstlone on ectivities thst aay reeult ln s i a i l s r iapscts 'o listsd spsciss snd thst require identical aitlgstlng asssurss to maintain adequate protection for auch apaciaa. Thia biological opinion reapenda to MMt' May 34, ItSS, coneultation raquaat. Ths opinion ls bsssd on the beat eelentlfle snd coaaerclsl data preeently avr .able snd lneorporstss lnforastlon froai 1) previous MMS Suaaai valuations, 2) prsvious NMPS biological opinione en platfo. reaoval, 3) tha sclsntlflc literature, and 4) other pertinent end svsllsbls informetion. Conou tation auat be relnitietad l f nev Information boeeaea svsllsbls concerning impacta to listed apeciea thet would sltsr ths conclusions rsschsd ln this opinion or require aodlflostion of ths asssurss idsntifisd ln ths attached Incidental tsks ststsaent. Censultstien will continue on s eeee-by-eeee basis for theeo otrueturs rsmovsls thst de not east the erlteria eetabliahed for "stsndsrd" rsaovsls.

Description of Promoted Action:

Tha propossd setlen involvss tha removsl, by axploaiva meant, ef offahora e l l and fee atructuraa located in Pederal vstsrs ln ths Gulf ef Mexlee. tam oval ef the etmeturee v l l l be sceeopllshsd by severing the aupport pilings, csissons, well conductors, ete., using varying amounts Of axploaivaa te peralt aalvage ef the structures. Thia involvee the plsosmsnt ef exploaivea inaida er outaide of aupporting etrueturee snd detonating ehsrgss priaarily uaing alectrenleslly controlled algnala.

This "generic" consultation considers only these removsl operations thst meet cartaln erlterle pertaining ta the sise ef ths sxplosivs charge used, detenstlon depths, end number ef blasts per structursl grouping, the apecific erlteria sstsblishsd to cover sueh removals sre ss follove:

2

SG4

1) Use of high velocity exploaivea (detonetion rata greater than 7,«00 setsrs/sscond).

2) A aaxlaua of eight individual blaata par qroup of datonationa with charoea ataggarad at an Intarval of O.t aeeonda (too allllteeonda).

JJ Chargaa auat be eet et a alnlaua depth ef if feet below tha aadleant aurface. Severing of atructuraa above tha aedieent aurfaca "open weter" auat be accoapl lahed by aachanlcal (non-expleaiva) aethoda.

4) Tha aaxlaua aaount of axploaivaa par detonetion la net te eaeaad SO pounde.

Speciea Occurring ln the Projeet Areat

Listed apse Isa under tho jurisdiction ef MCPS thst aay occur ln the projeet srss:

right vhsls

finback whsls

huapbeck vhale

ee l vhale

•pars vhsls

graan turtle

Kemp's ridley t u r t l e

leethermae* t u r t l e

loggerhaad t u r t l s

hawksbill t u r t l s

ncinmnc Mug aH.*"taana f l a a i a l 1.

i tUtnQPkSri

laxtittsr- ruavattniUst

STATUS

E

I

t

t

t

fh !•

I

t

Th

ere listed se •All of the u.t green turtle oepulatic.. .__ threatened aaeept the florids breeding populstion, whieh lieted aa endangered.

LISTED

S/2/70

t/a/70

t/a/70

t/a/7o

t/a/70

7/at/7t

ia/a/70

t/a/7o

7/at/7t

t/a/70

is

No c r i t i c a l habitat has bsen ths abova spsciss. i in tho project arsa for

Asssssssnt of Ispactsi

Baaad upon thair known distribution and abundance in tha COM andangarad vhalee ars believad unlikely to occur in tha v ic in i ty of the propoaad atructura raaoval ac t iv i t iaa , and, tharaforo unlikely to ba advareely affected by ths propossd sctlon.

Prsvious KMPS biologicsl opinions (Nsvsaber as, ItSS snd Pebruary as , 1*17) hava addreeaed. in ds t s l l , rsaovsl sf structurss in tha COM. Accounts of endsngsrsd snd thrsstsnsd speelss which oeeur ln tho projeet srss , snd ths "Asaaeeaent ef XBesots" eentained ln theee prler opinione alao apply te thie eonaultation snd srs incorporated by referenee.

In euaaary, the oplnlone referenoed above acknowledge the exiatenee of a peeeible relationship between the uss ef undervstsr saploslvss ln rsaovlng platforaa snd rs l s t sd atructurea snd ths occurrence ef stranded eea turt les , aerine a a a a a l s fTuillflpl. truncttUS) *nd f i s r L l a l t s d experiments conductsd by NMPS, Oslvssten Lsborstory eenflra thst sss tur t l s s (snd othsr serine vertebrates) found in proalalty te petroleum platforaa esn ba injured or k i l led by reaovsl oparationa eaploylng underwater eapleeivee (Rllae, I S I S ) .

Teehnology aoat commonly used ln the dismantling of plstforas lneludeat bulk exploaivee, eheped eapleelve chargea, aechenlesl and sb raa ive eutters snd underwater sre eutters. Ths uss ef bulk exploaive* haa bscsae the induatry'a atandard procedure for aevering pillnga, well conductor* and relstsd aupporting structurs* (approx. tot uss) . When using bulk ehsrgss, ths ins ids sf ths structure esn be jstted out te et lesst IS f s s t belov the ssdisent floor te ellov plseeeent ef eaploeivee Ineide of the etrueture, reeult lng In a dec res ss ln the iapulee snd preeaurs foreee releessd inte ths vstsr eoluan upon dstenstisn. Ths uss sf hist velocity shaped ehsrgss l s r sport sd te hews seas advantsgss ever bulk sxplosivss snd hes bssn ueed in eoablnstlon with smaller bulk chargaa. The cutting aetion obtained by a shaped charge i s ecemmapllehed by focusing the exploeive energy with a een lesl e a t a l l l c l iner , A aajor advantage aaeoeleted with uee of high veloeity shaped charges i s thst s am*lisr saount ef exploeive charge l s required ts ssvsr the strueturs, wnich s lso reeulto in reduetlone in the lapulss snd preeeure ferees rs l ssssd into ths watsr column. Ose of aechanleel eutters snd undervstsr sre cutter* la auceeeaful in soae olreuastsnees snd de net produce the lapulae end pressurs foreea a a aee i a ted with detonation ef exploeives, however, theee aethods sre, ln eeet inetaneea. aore tlae eonaualng, eoetly snd aore heasrdeus te d iv er s . As s rssult , thsss aethods sre net ueed en s reutins beele (MMS Report en Pletfere Rsoovsl Techniquee).

Based upon data obtainad during pravioualy conductad "expedited" coneultationa on platfora reaovala, tha fallowing it a ccrpariaon of the typaa of exploaivea aoat likely to be uaad ln tha propoaad reeovel operational

Explosive Pitanating Vtlocity ari«anefa BOX approx. a,199 a/aac. i . j l

C-4 epprox. t,ooi a/aac. l . l !

Coap.-t approx. 7,t01 a/aac. 1.32

• brieenee ia the eeeeure ef ehattarlng power ee coopered to TNT which haa briaence ef 1.00. (NMS teport en Platfora teaoval Techniquee, ISSS.)

Tha propoaed reaovel operationa v l l l be eocoapliehed ualng high velocity exploelvea. Ooo of this typo of axploaiva cherge ahould alnla'te the duration of tha iapulee and preeeure fereee producad by detonetien ef the charted, vhlle providing the aaount of force raquirad to eever tho etrueturee. According te MMS, restricting the grouping ef detonetione to eight individual bleete per group end etaggarlng bleata by O.t eaeenda (000 •lllleeeonde) v l l l alnlalae the eree affected by the blaate end auppreee pheelng ef ehock waves, thereby decreasing the cuaulative effecte ef the blaete. Xn addition, aince a l l datonationa v l l l oeeur tt leeet IS feet below the eediaent eurfece end no aore then SO pounds of exploalvea per bleat v i l l be paraitted, the aaount ef reeldu*. enerev releeeed Inte the aerine environaent ahould be redueed significantly. Aa a reeult, NMTS bellevee that alnlsal ahock and iapulee ferees v l l l be releaaed ln the vlelnlty ef reeevel operatlona et any given tiae.

To dete, ef approxlaately 44 previoualy oonducted eeneultatlona covering abandonaant eetivltlee, about 91 atructura reaovala have been coapieted. teeh reaevel operetion vee eonitared by NNPS obeervere end vee eeexeueted ueing appropriate ait ige ting •.aa eu rea tt the preeent tiae, elfht turtlee hava been elfhtad ln areea neer etrueturee being dlsaantled, et leeat tvo ef vhlch wore green turtlee. Of the eight eocuaented sight inga, ene turtle vee reported te he floating en it's beck neer a pletfere after detonetien ef chargaa, apparently stunned or injured. No ether incidents ef eee turtle injury er aortallty heve been reported. Therefore, NNFt bellevee thet the propeeed actiona ere net likely to rooult ln significant edveree iapacte te andangarad end threetened eee turtle populationa.

Conclus ions:

taeed on ths sbovs, l t l s our opinion thst rsoovsl of plstforas • nd rslstsd stsuiturss in ths GOM is not likoly to jeopardise ths continued existence of thrsstsnsd snd sndsngsrsd spsciss undsr ths jurisdiction of MUM. However, NNPS concludss thst ths propossd sctivltiss osy rssult ln ths injury or oortsllty of loggerhead, Xssp's ridley, grssn, hawksbill snd leatherback turt lss . Thsrsfors, pursusnt ts Ssction 7(b)(4) of ths ESX ws hsvo sstsblishsd s loo lsvol sf incidsntsl tsk* * d tsras snd conditiono nocssssry to slnlslse snd aonitor this iapact. coaplisnca vith thsss t a n a and conditiono l t tha responsibility of NNS snd ths psnl t spplleant.

Nslnltlstlsn sf Consultation:

consultation aust bs rslnitistsd lft l) the saount or eatent of taking apecified ln tha lneidental Uke ststsasnt is aet or exceeded* 3) nev inforaation rsvssls iapaets of ths prsjset thst aay effeot listsd spec iss in s aanner or ta an aatant not considered ln thie opinion; 3) the identified eetlvitlss srs aodifiad in s asnnsr that eeueee en sdvsree effeet en lieted epoolee not previously coneidorodf er 4) t nev epeelee le lieted or cr i t i ca l hsbltst ls deeigneted thst toy be affected by the propoeed setlvltiee.

INCIDENTAL TAXI STATENENT

Section 7(b)(4) of tho endangered Spocloo Act requires thet when e propoeed eqency eetlon le found te be eoneletent with Section 7(e)(2) of the Act end tho propoeed ectlone ney incidentally teke individual* of lieted epocioe, KMPS will ieeue % eteteeent thet epeclflee the inpect (eaount er extent) of eueh lneidentel teklnq. Incidentel teklnq by the federel eqency or eppllcent thet eoepliee with the epecified terae end conditione of thia atateaent la authorised and exeapt frea the taklnq prohibltiono of the f'A.

taeed on et rind inq rwcorde, lneidental cepturee aboard coaaercial ehnap veeeela and hletorleel dete, five epeelee of aa* turtlee ere known to occur ln northern Oulf ef Mealeo wetere. currant evelleble inforaation on tho reletienehlp between aee turtla aortallty end tha uae of high-velocity expleelvee to reaove e l l pletforae indicetee thet injury end/or death ef eee turtles aay raault free the propoeed ectlone. Therof are, pureuent te Section 7(b)(4) ef the BSA, en incidental teke (by Injury er aortelity) le* el ef one deeuaented xoap'e ridley, groon, hevk oll l er leetherbaek turtle er ten loggerheed turtlee le eet fer e l l reaovel operatione eonduetod under the terme end eonditione ef thi.a lneidentel teke eteteaent. The level ef taking epeelfled here ie cuaulative fer e l l reaovele eevered by thie eoneu)ration. I f the lneidentel teke aeet a or eaeeedt thie epecified level, MMS auat reinitiate coneultation. The Southeeet teflon, NMPS, v l l l cooperate vith MMS in the reviev ef the incident te determine the need for developing further aitigation meeeuree.

The reeeonoble end prudent meeeures thst MMPt mol laves sre necesssry ts elnlmlse tho lap eet ef lneidentel takings hsvs bssn discusssd vith MMS and v l l l be incorporated In the reaovel dee len for "etenderd" structure reaovale. The following taraa end conditione ere eetehl lehed for theee removals ts Implement the identified aitlgetion meeeuree tad te document the lneidentel take anould sueh teke occur i

1) Quelified 3boorvor(s), ee epproved by aMFt, auet be used te son iter the srss around the eite prior to, during snd sfter dstenstlse ef ehsrgss. Obeerver coverage v i l l begin 4t hours prior to detonetien ef charges. If see turtloe ere observed in the vlelnlty ef the pletform end thought te be resident at the elte, pre- end peet •detenetien diver eurveye auet be conducted.

2) On deye that blasting operations occur, a 3C-».r,ute • • n a . aurvay aust ba conducted within ono hour bafora and ons hour a f tar aach blaatlng apiaode. Tha NNTS-epproved obaarvar and/or ."•.'Mrs on-aita paraonnal (KMPS aaployaa only) oust bs ussd to check for tha proaancs of turt lea and, l f poaelble, to identify apeciea. If waathar conditions (fog, excssslvs wmda, ate.) aaaa i t laposaibla to conduct s s r i s l survsys, blssting sc t iv i t iaa eay bs allowed to proceed i f approved by ths KMPS snd/or KMS psrsonnsl on-site.

3) I f aaa turt lss s r s observed In ths v ic in i ty of ths platfors (within 1000 ysrds of ths s i t s ) prler te detonetlng chsrgss. blsst ing will bs dslsyed unt i l attempts ars succssaful ln reaevlng t ea at laaat 1000 ysrds froa the bleat s i t s . Ths s e r i s l survey aust be repeated prler te reeualng detonation of chergee.

4) Detonation ef exploeivee wi l l oeeur no aoo ner thsn 1 hour fallowing sunrlss snd ne l s t e r then 1 hour prler to sunsst. However, I f l t l s dstsrelned by MMPS snd/or MMS en-elte peraonnei ths t spsclal clreuaatancee Justify s aodifleetlon of theee tlae reetr lot lone end thet eueh eodif leetlen le not l ike ly te edvereely iapact l i s t ed spociss, blssting aay be allowed te proceed outaide of t h i e t i a a frame.

5) During a l l diving operations (workinf divas ss rsquirsd ln the course sf ths reaovala) , divere w i l l be instructed te aeen the eubeurfeee ereee eurroundlnf the pletfora (bleeting) eltea for turtlee and aerine samaais. any sightings euet be repertsd to the KMPS er MMS on-site peraonnei. Open cooplstlsn ef blaeting, divsrs auat report end sttsopt to roeover sny sightsd injured or deed eee turt lee or eerine saaaala.

S) Chsrgss BUSt SO staggered O.t seconds (tOO a i 11 iseconds) for ssch greup of structures, te e inie iss the cuaulative effecte of the bleete. I f s rsoovsl operetion level woe ault iple groupings sf etructuree, tho lntervel between detenetien ef cherges fsr eeeh group ehould be aln i a l sod te eve Id the •chuaalng" effect. Wherever sueh lntsrvsle exceed to-alnutee, ths s s r i s l survsy aust he repeated.

?) The uee ef soars chargee should be a voided to e inie iss ths "chuaalng aff set.* Oee ef ecare cherges may be elloved only l f approved by the NMPS and/or MMt on-ai ta pereonnel .

S) A report suaaarlslnf the results ef the reecvsl and aitlgetion aeaauree auat be subalttsd t s the NNS Gulf sf Nexleo Region within 11 workinf deys ef the rsoovsl. A copy ef the report ouet be forwarded te NMPf, Southeeet Rsgion

Thie Incidental take atataaant applloa -nlv to . n d . ^ . ^ thraatanad aaa turtlaa. in o r t a r t o i i ^ a aarina aaaaai apaciaa. tha K i i i T ^ o f section 101(a) (S) of tha t4arlna Maaaai P r S a i t ^

REFERENCES

C a i l l o u e t , C.W., A.N. Landry. M.J. Duronalet, t . A . Manzella. C . T . Fontalna, O.t. Revere, R.L. Indalicato, T.O. Hi l l laaa , and 0. Forcuccl, l t t t . Prel iainary Evaluation of t iological Inpacta of Undarvatar Exploalone Aaaoclated vith toooval of an Oil r i e ld Structura froa tha Oulf of Maxico Near Crystal taach, Taxas. National Narine Piahariaa Service, Southeaat Piahariaa Centar, Calvaaton Laboratory 3a pp.

Duronalet, N .J . . C.N. Caillouet, S. Nenxalle, K.N. Indalicato, C . T . Fontaine, O.t. tevara, T. Miliiaes and 0. toaa. i t s* . The t f facta of an Undervater Explosion on tho Turtlea L#pidocha»iy« iTJUeBi And Caretta caratta with Obeervetion of tf fecte en Other Marina Oreanlaoe. Unpubllehed Trip teport - teooval of Tennaco Oil Flatf oro on June S l , l t t t . NNFt, fEPC, Calvaaton Laboratory, l t pp.

Fontaine', C .T . , l t t t . Obeervatione en the teooval ef Tenneco o i l Platform 4t3-t. Meat Caaeron Field, 20-23 July l t t t . Unpubllahed Trip teport te NNFt, SEPC, Oelveeton Uboretory t pp.

N l laa , t .p . , i s s t . Suaavery Report oe Slologleel Zapeete ef Offehore Petroleum Pletfora Severence Del no. Exploeivee. Unpubllehed Report to NNFt, StFC, Oelveeton Laboretory i t pr

Ninerele Nenageaent tervlee, l t t t . Pletform Reaovel Techniquee. Lnpublijned Report, MMJ Culf ef Nexico Region, 14 pp.

Nationel herine Fieheriee tervlee, l t t t . t iological opinion Concerning Xepecte of Proposed Reaevel ef Clt iee Servlceo o i l end Oee Corporat ion'e Offehore Pletform t-1, Loceted ln celveeton Ilock 144. Oulf ef Nexleo. 14 pp.

Nationel herine Fieheriee tervlee, I t t ? . t iological Opinion Concerning Prepeeed teaoval ef Pennsoll Coepeny'e Pletform A, Loceted ln Vermillion alack ast. Oulf ef Mexlee. at pp.

Renaud. N. aad 0. Citechleg. 1007. Study of Slologleel Iapacte of the Exploeive Reaovel of en Offahore Platform (Pennsoll Pletform - verai l l ion aat t ) . Unpubliehed Trip Report te NNPS, StFC, Oelveeton Laboratory, tpp.

10

40 Nobll Exploration and rYoooolosj C M

• ap any U . t . I n c .

v a r a i i i o n 1 * ' -l t d i t a ;

41 Kerr-RcCee .orporat ion Sbip Sboal 204 k

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a l i t 1U1 j

44 Tenneco O i l Explorat ion aad Pf Haul l a a a*Mtt f t att

4 9 # nobll Exploration awaa rreoaoiao Caa

• • aaaaa/ o . t . Xoo.

CboiIport) • A * • * r l e H

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40 Nobil exploration aaal PraaOclao Oaa aaaa* u . t . Iao . V a * * l l l e n Td

47 Seamdon Oi l Corporat ion t i l n a t u i 141 m

40 Conoco ine. • •i t i 94 47 49 Nobil Exploration aaxl Prodacinaj Coa taany O . t . I n c . Nolo Paaa t l

50 Nobll Exp r a t i o n and Producing Coa pany u . t . l a c . south M t o i a 0

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