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SF_PP_Commerce-St-Plume_7-15_REVISED_LINES.indd 1 7/24/2015 12:03:11 PM
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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
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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.
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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%
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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
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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
Feet ³1 inch = 300 feet
Client-Focused, Employee-Owned
Nobis Engineering, Inc.18 Chenell Drive
Concord, NH 03301T(603) 224-4182
www.nobiseng.com
Engineering a Sustainable Future
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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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
COMMERCE STREET PLUME SUPERFUND SITE
WILLISTON, VERMONT
0 150 300
Feet ³1 inch = 300 feet
Client-Focused, Employee-Owned
Nobis Engineering, Inc.18 Chenell Drive
Concord, NH 03301T(603) 224-4182
www.nobiseng.com
Engineering a Sustainable Future
96 Commerce Street(former Mitec Property)
Western Portionof the Plume Eastern Portion
of the Plume
S B
ROW
NELL
RD
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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
COMMERCE STREET PLUME SUPERFUND SITE
WILLISTON, VERMONT
0 60 12030
Feet ³1 inch = 60 feet
Client-Focused, Employee-Owned
Nobis Engineering, Inc.18 Chenell Drive
Concord, NH 03301T(603) 224-4182
www.nobiseng.com
Engineering a Sustainable Future
96 Commerce Street(former Mitec property)
Former Lagoon