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SF_PP_Commerce-St-Plume_7-15_REVISED_LINES.indd 1 7/24/2015 12:03:11 PM

S U P E R F U N D | C L E A N U P P R O G R A M A T E P A N E W E N G L A N D P R O P O S E D P L A N

AIP Alling Industrial Park ARAR Applicable or relevant and appropriate requirementCERCLA Comprehensive Environmental Response, Compensation and Liability Act (a.k.a. “Superfund”)EPA United States Environmental Protection AgencyFYR Five-Year ReviewHI Hazard indexMNA Monitored natural attenuationO&M Operation and maintenancePAHs Polycyclic aromatic hydrocarbonsPPB Parts per billionRCRA Resource Conservation and Recovery ActRI Remedial investigationTCE TrichloroethyleneVOC Volatile organic compoundVT ANR Vermont Agency of Natural ResourcesVT DEC Vermont Department of Environmental Conservation

A C R O N Y M S

Table 1: Proposed Cleanup Levels (PCL) Contaminant Selected PCL Basis

Groundwater – VOCs 1,2 Dichloroethane 5 µg/L MCL† cis-1,2 Dichloroethylene 70 µg/L MCL Methylene Chloride 5 µg/L MCL Tetrachloroethylene * 5 µg/L MCL Trichloroethylene 5 µg/L MCL Vinyl Chloride 2 µg/L MCL

Groundwater – Metals Arsenic 10 µg/L MCL Total Chromium 100 µg/L MCL Cobalt 6 µg/L Risk-based (HQ=1, residential) Iron 14,000 µg/L Risk-based (HQ=1, residential)

Soils – PAHs (for 96 Commerce Street only) Benzo(a)anthracene** 0.15 mg/Kg Risk-based (10-6 , residential) Benzo(a)pyrene** 0.015 mg/Kg Risk-based (10-6, residential) Benzo(b)fluoranthene** 0.15 mg/Kg Risk-based (10-6 , residential)

Soils – Metals (for 96 Commerce Street only) Hexavalent Chromium 0.3 mg/kg Risk-based (10-6, residential) Arsenic** 0.67 mg/kg Risk-based (10-6, residential) † Maximum Contaminant Level (MCL) per federal and equivalent state drinking water standards. * Direct contact to and inhalation of shallow groundwater with TCE concentrations in excess of 2.3 µg/L pose a risk to the construction/utility worker. EPA is selecting the MCL for TCE as the cleanup level as a matter of policy, and based on Site-specific conditions. Specifically, the TCE plume is generally at depths ranging from 10 to 15 feet below the water table, and, the exposure assumptions (8 hrs/day, 5 days/per week, for 6 months) are highly conservative. ** Or background, as determined during pre-remedial design soil sampling, whichever is higher.

Tabl

e 2

- Com

paris

on o

f Cle

anup

Alte

rnat

ives

a

Med

ia:

Soi

l G

roun

dwat

er

Vap

or M

itiga

tion

Nin

e C

riter

ia

SO1 No Action

SO2 Institutional/ Engineering

Controls

*SO3 Excavation and Off-Site

Disposal

GW1 No Action

GW2 Institutional

Controls

GW3 MNA and

Long-Term Monitoring

*GW5 In situ

Treatment and MNA

VM1 No Action

VM2 Sump Pump,

Vapor Venting, Treatment and

Discharge

*VM3 Enhanced

Vapor Mitigation

Prot

ects

hum

an

heal

th &

en

viro

nmen

t

Mee

ts fe

dera

l &

stat

e re

quire

men

ts

Prov

ides

long

-term

ef

fect

iven

ess

Red

uces

mob

ility

, to

xici

ty o

r vol

ume

Prov

ides

sho

rt-te

rm

effe

ctiv

enes

s

Impl

emen

tabl

e

Cos

t

Cap

ital C

ost

$0

$55,

341

$595

,159

$0

$61,

461

$238

,345

$6

,805

,101

$0

$15,

428

$47,

291

O&

Mb

$128

,844

$6

2,03

7 $1

84,1

78

$1,3

49,1

79

$767

,042

$9

7,71

3 $1

10,1

21

Tota

l Cos

t $1

84,1

85

$657

,196

$2

45,6

39

$1,5

87,5

24

$7,5

72,1

43

$113

,141

$1

57,4

12

Stat

e of

Ver

mon

t ac

cept

ance

To

be

dete

rmin

ed a

fter t

he p

ublic

com

men

t per

iod

Com

mun

ity

acce

ptan

ce

To b

e de

term

ined

afte

r the

pub

lic c

omm

ent p

erio

d

* E

PA's

pre

ferr

ed o

ptio

n

Mee

ts o

r exc

eeds

crit

erio

n P

artia

lly m

eets

crit

erio

n D

oes

NO

T m

eet c

riter

ion

a Thi

s ta

ble

depi

cts

a su

mm

ary

of th

e al

tern

ativ

es.

It is

not

a s

ubst

itute

for t

he d

etai

led

anal

ysis

incl

uded

in th

e Fe

asib

ility

Stu

dy.

b O

&M

con

side

rs N

et P

rese

nt V

alue

and

is p

rovi

ded

at a

dis

coun

t rat

e of

7%

96 Commerce Street(former Mitec property)

Former Lagoon

Former Leach Field

16-16

106-15

69-12

106-5

3-38

3-38

69-13

69-8

106-1

69-72a

106-11

3-60

62-5

62-2

105-22

106-2

3-43

16-10

73-2

19-38

19-37

19-2

COM-70

3-9

62-3

19-36

COM-63

3-45

3-53

3-31

3-35

19-14

106-20

16-14

3-13

65-21

COM-9105-35

19-30

3-36

65-12

65-23

COM-40

3-7

19-20

19-32

3-32

3-27

3-37

105-24

106-4

19-12

105-403-1

19-11

19-19

COM-32

19-31

19-29

3-54

105-42

65-5 105-39

3-26

37-20105-42

3-4

19-17

65-9

105-36

3-4

37-22

19-23

65-1

105-34

105-38

19-25

3-18

43-2

65-8

65-4

65-7

3-48

3-52

105-19

COM-33

105-47

65-3

3-50

65-2

COM-34

107-1

3-10

65-6

3-38

COM-43

65-10

65-19

65-17

37-18

3-15

3-23

105-28

105-45

65-15

3-5

65-11

3-39

16-12

3-15

3-12

3-16

3-14

COM-10

3-30

3-24

3-47

3-20

105-41

105-26

105-43

19-5

LegendUnnamed Stream

Building

Alling Industrial Park

Property Line withMap-Lot #

Notes:

1. Site features are depicted fordisplay purposes only.

FIGURE 1STUDY AREA

COMMERCE STREET PLUME SUPERFUND SITE

WILLISTON, VERMONT

0 400 800200

Feet ³1 inch = 400 feet

Client-Focused, Employee-Owned

Nobis Engineering, Inc.18 Chenell Drive

Concord, NH 03301T(603) 224-4182

www.nobiseng.com

Engineering a Sustainable Future

COM

MER

CE S

T

SHUNPIKE RD

MARSHALL AVE

OMEGA DR

HARVEST LN

BLAI

R PK

RD

S BR

OW

NELL

RD

KIRB

Y LN

VERMONT ROUTE 2 (WILLISTON RD)

19-38

CO

MM

ERC

E ST

OMEGA DR

KIR

BY L

N

CO

LTO

N P

L

Notes:1. Location of all features is approximate. Map is for reference purposes only.Nobis Engineering Inc. makes no claims, warranties, representations,expressed or implied, relating to the completeness, accuracy, or reliability ofthe data shown.

2. Groundwater TCE contours are a generalized combination of the shallow,intermediate, and deep interval aquifers. The contours are based on maximumTCE concentrations obtained during groundwater sampling events between2008 and 2012. This is one interpretation of the data, others are possible.

FIGURE 2OVERBURDEN TCE PLUME

COMMERCE STREET PLUMESUPERFUND SITE

WILLISTON, VERMONT

0 300150




Concord, NH 03301T(603) 224-4182

www.nobiseng.com


S B

RO

WN

ELL

RD

SHUNPIKE RD

LegendStream

Groundwater Flow Direction

Building

TCE Concentration (µg/L)> 5 ≤ 50

> 50 ≤ 500

> 500 ≤ 5,000

> 5,000 ≤ 50,000

> 50,000

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A

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!A

!A

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!A!A

!A!A!A

!A!A!A

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MI-8

MI-2

MI-1

BR-1

BF-4

BF-1

OE-2B

BM-3SBM-3D

ARC-3

AL-15

AL-14

AL-12

BW-13S

BW-11DBW-11CBW-11BBW-11A

MW-11S

MW-10D

MW-09MMW-09D

MW-08SMW-08M

MW-07M

MW-06MMW-06D

MW-05D

MW-04D

MW-03D

MW-02M

MW-01D

ASI-23S

ASI-16S

ASI-15SASI-15D

ASI-14S

ASI-13SASI-13D

ASI-11S

ASI-08S

ASI-05SASI-05D

ASI-04SASI-04D

ASI-03SASI-03D

ASI-02SASI-02D

MW-05D2

ASI-22SASI-22D

ASI-23D2

ASI-15D2

ASI-14D2

ASI-11D2

ASI-04D2

ASI-02D2

ASI-16D2

ASI-05D2

BW-11-Deep

SHUNPIKE RD

COM

MER

CE S

T

OMEGA DR

KIRB

Y LN

WEL

LNES

S DR

COLT

ON

PL

Legend!A Existing Monitoring Well

A Proposed ISCO Injection Locations

Plume Division

Unnamed Stream

Proposed ISB Treatment Zone/Barrier

MNA Treatment TCE >5 ppb

ISB Treatment TCE >500 ppb

ISCO Treatment TCE >50,000 ppb

Notes:

1. Extent of groundwater impacts based on TCE concentrationsobserved during the October 2012 groundwater sampling round andrepresents the total spatial extent from the shallow, intermediate, anddeep intervals. TCE was the most widespread contaminant found.

2. A radius of influence of 20 ft. is assumed for injection wells. Wellsare located based on 30 ft. spacing for sufficient coverage.

FIGURE 3ALTERNATIVE GW5: IN SITU

TREATMENT ZONES


WILLISTON, VERMONT

0 150 300




Concord, NH 03301T(603) 224-4182

www.nobiseng.com


96 Commerce Street(former Mitec Property)

Western Portionof the Plume Eastern Portion

of the Plume

S B

ROW

NELL

RD

COM

MER

CE S

T

Legend

Soil Excavation (approximate)Former LagoonBuildingsProperty Lines

Notes:

1. Locations of site features areapproximate and should be used fordisplay purposes only.

FIGURE 4ALTERNATIVE SO3: SOIL EXCAVATION

AND OFF-SITE DISPOSAL


WILLISTON, VERMONT

0 60 12030




Concord, NH 03301T(603) 224-4182

www.nobiseng.com


96 Commerce Street(former Mitec property)

Former Lagoon

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