### Superlun d Record s Cente r SITE : Cdhh,oni'£n-^irjger

- \ w BREAK : '8- 3 ' OTHER

- ^403 0 4 

# FINA L CLOS E OU

T REPOR T

TH E CANNON

S ENGINEERIN G CORP . (CEC) SUPERFUN D SIT E

BRIDGEWATER , MASSACHUSETT S

JUN E 201 3

U.S

. ENVIRONMENTA

L PROTECTIO

N AGENC Y NE W ENGLAN D - REGIO

N 1 5 POS T OFFIC E SQUARE , SUIT E 10 0 BOSTON , M

A 02109-391 2I. INTRODUCTIO N Thi s Final Clos e Ou

t Repor t (FCOR ) document

s tha t th e Unite dStates Environmenta l Protectio n Agenc y (EPA ) ha s completed al l response action s fo r th e sourc e contro l (SC ) an d managemen

t o f migratio n (MOM ) operabl e unit s a t th e Canno n Engineerin g Corp
. (CEC ) Superfun d (Site) , located a t 42 Firs t Street, Bridgewater , Massachusetts
. A Superfund Interi mClos e Ou t Repor t (ICOR ) wa

s completed an

d signed i n Septembe

r o f 199 1 fo r th e Site
. Th e 199 1 ICO Rwa

s completed to documen

t tha t th e soi l clea

n u p level s fo r th e SC operabl

e uni t wer e achieved ; tha

t th e remedia l action s wer

e completed an d tha t al l physica

l constructio n o f

th e remedie s wer

e als o complete
. Th

e ICO Rdi d not cove r th e MO M operabl

e uni t activitie s becaus

e thos e remedia

l action s consisted o f lon g ter mgroundwater , sediment, surface , an d see p sampling fo r

aperio d o f

15-2 0 years . Furthermore, page 10of

the 1991, ICOR states the following: A final closeout report will be issued for.the Bridgewater

Site upon achievement

of all groundwater

cleanup target levels and

completion of

the long-term ground

water monitoring program. The final closeout report (FCOR) will

be a supplement

to the interim closeout

report and contain specific information concerning the groundwater monitoring program. The long term monitoring efforts have been completed. Therefore EPA is completing a FCOR for the Site. x Thi s FCO

Rha s been, completed i n accordanc e wit h EP

A guidance , Clos e Ou t Procedure s fo r

Nationa l Prioritie s Lis t

Sites , OSWE

RDirectiv e 9320.2-22 , date d Ma y 2011
. II . SUMMAR

Y O F SIT E CONDITION

S A . BACKGROUN

D SUMMAR

Y & SIT E DESCRIPTIO

N ; Th e CE C facilit y i s a7-acr

e sit e located i n asmall industrial pkr k i n th e wester n par t o f th e Tow n o f

Bridgewater , Massachusetts
. Prio r to 1969 , th

e industrial par

k consisted o f

awooded lowlan dbordered to th e north , south , arideas

t b y rural agricultural land
. Curren

t lan d us e aroun d th e sit e consists o f

industrial developmen

t i n th e immediat

e vicinit y to th

e nort h an d east , an d awooded lowlan dto th

e sout h an d west , an

d agricultural an

d residentia

l developmen

t i n th e outlyin g areas . Th e CE C Bridgewate

r sit e i s located i n th

e southeaster

n portio n o f

th e Tow n River watershe d whic h ha

s a n estimate d are ao f 5 6 squar e mile s an

d feed s wate

r suppl y well s fo r

th e town s o f

Bridgewater , West

Bridgewater , an

d Raynham
. Hockomock

Swam p occupie s alarge portio n o f th e watershed
. Lak

e Nippenicke t i s th e larges t surfac e waterbod

y located withi n 1 mil e o f th e Site
. Th e neares t drinkin g wate

r well , operate

d by th e Tow n o f

Raynham , i s located 1.

3 mile s west o f th e Sit e on th e shor e o f Lak e Nippenicket
. Pag e 1 o f 1 0Th e CE C facilit y i s on

e o f th e fou r separat e but relate d site s whic h for mth e Cannons Sit

e Group
. Th

e other s ar e Cannons Plymout

h Harbor locate d i n Plymouth , Massachusetts ; Tinkham' s Garag e i n Londonderry , Ne w Hampshire ; an d Gilso n Roa

d i n Nashua, Ne w Hampshire
. Al l fou r site s ar e bein g handled unde r on e enforcemen

t effort
. CE C firs t purchase d th e parcel o f

land a t th e Sit e i n November , 1974
. Th e propert y wa s developed b y the

mt o handle , store , an

d incinerat

e chemica

l wastes . These activitie s occurred frequentl y a t th e Sit e betwee n 197 4 an d November , 198 0 whe n operation s a

t th e Sit e cease d after th e MassDE

P (then calle d th

e Departmen

t o f Environmenta

l Qualit y Engineering ) revoke d CEC' s Wast e License , citin g documen

t falsificatio n an

d othe r wast e reportin g violations
. Ove r 70 0 drums an

d approximately 155,00

0 gallon s o f

liqui dwast

e an d sludge i n bul k storag e wer e lef t behin d on-sit

e by CEC
. Betwee

n 1980 an d 1982 , th

e Massachusett

s Departmen

t o f Environmenta

l Protectio n (MassDEP) an d EP A conducted Sit

e inspections , performe d sampling an d analyse s an

d confirme d th

e presenc e o f chemica l contaminatio n a

t th e Site
. Severa

l tanks an d drums wer

e als o observe

d t o b e leaking
. I n orde

r t o alleviat

e th e proble mo f

leakin g contaminatio n an

d waste s lef

t on-site , th

e MassDE

P performe d aremova

l action
. I n Octobe r 1982 , MADEP' s contractor , Je t Lin e Services , Inc. , remove d approximately 155,00

0 gallon s o f

sludg e an d liqui dwaste s tha

t wer e stored i n tanks an d approximately 71 1 drums fro mth e Site
. A subsequen

t remova l wa s conducted b y th

e agrou p o f Potentiall y Responsibl

e Partie s (th

e "PR P Group" ) i n Jun e 1988
. Th

e PR P Grou p removed th

e bul k contents o f

a n underground tank , a septi c tank , , 3 tanke r trailer s an

d small ( 5 gallo n o

r less ) containers fro m laborator y an d storag e area s a t th e Site
. Th e sit e wa s mad e fina l o n th

e National Priority Lis t

(NPL ) o n Septembe

r 8 , 1983
. B . SUMMAR

Y O F TH E SELECTE D REMEDIES & REMEDIAL ACTIO N OBJECTIVE S Th e Recor d o f Decisio n (ROD ) fo r

th e CE C Sit e wa s signed b y EP

A o n Marc h 31 , 198 8 an

d separate

d th e cleanu p o f th e Sit e int o tw o Operabl

e Units ; Managemen

t o f Migratio n (MOM ) fo r

groundwate

r an d Sourc e Contro l (SC ) fo r soils
. 1 . Managemen

to f Migratio n Operabl

e Uni t Th e MO M portio n o f

th e remed y include d alon g ter

mmonitorin g progra

mt o assur e tha t contaminatio n i n groundwater , abov e Maximu mContaminan t Level s (MCLs) , di dnot

migrat e off-sit e an

d to als o assur

e tha t contaminan

t level s on-sit

e naturall y attenuate

d ove r time
. Th e 198 8 RO D estimated tha t groundwate

r cleanu p targe t levels , base

d on th e ingestio n o f

on-sit e groundwater , woul db

e achieved withi n 1 5 t o 2 0 years . Lon g ter msampling bega

n i n 199 1 an

d th e las t samplin g even

t wa s completed i n Septembe

r o f 2010
. Wit h th

e exceptio n o f

arsenic , al l Pag e 2 o f 1 0 (contaminants o f concer n me t MCLs
. I n Octobe

r 2012 , MassDE

P completed ane w groundwate

r us e an d value determinatio n specifi c t o th e Cannons Engineerin g sit

e an d determined tha

t th e groundwate

r beneat h th e sit e i s n o longe r potable drinkin g wate

r becaus e th e groundwate

r a t th e sit e i s n o longe r considered adrinkin g wate r aquifer
. Therefor

e th e requiremen

t to reac h MCL s i s n

o longe r applicabl e no

r relevant
. Furthermore , i n 2013 , asit e specifi c cumulativ e risk assessmen

t wa s performe d usin g th

e las t thre e yea r o f sampling dat

afro m2008 , 2009 and
. 2010
. I t wa s determined tha

t potentia l risk s fo r bot h huma n healt h an d th e environmen

t wer e al l wel l withi n EPA' s acceptabl e ris k rang e o f 1 x 10~

4 t o 1 x 10" 6
. Thi s informatio n i s documente d an d discusse

d i n greate

r detai l i n a n Explanatio n o f

Significan t

Differences , date

d Ma y 2013
. Sourc e Contro l Operabl e Uni t I n summary , th

e sourc e contro l portio n o f

th e remed y provide d fo r

fencin g th

e entir e sit e to restric t

access , onsit

e therma l aeratio n o f

soil s contaminated wit h volatil e organi c compounds (VOCs ) an d treatmen

t o f PCB contaminated soil s offsit e b y incineration
. I n addition , onsit

e building s an

d tanks wer

e decontaminated an

d removed , an

d soil s unde r thos e structure s wer

e sampled , alon g wit h othe r soi l locations
. An y contaminated soil s tha

t pose d athrea t to huma n healt h an d th e environment , wer e remediated vi aon

e o f th e abov e mentioned therma

l treatmen

t technologies
. Al l remedia

l actions , constructio n activitie s an d cleanu p leVel s relate d to th

e SC Operabl

e Unit , wer

e completed an

d achieved an

d we'r e documente

d vi a confirmator

y sampling
. Therefore , o n Septembe r 30 , 1991 , EP

A prepare d a n ICO RRepor

t fo r th e S C Operabl

e Uni t an d include d i t

i n th e Administrativ e Recor d fo r th e Site
. Th e remedia l actio n objectives , a

s se t fort h i n th

e 198 8 ROD , identifie dto mitigate threats to publi c healt h are , ar e a s follows :

• preven

t direc t contac t wit h contaminated soil s throughout th e sit e • preven

t ingestio n o f

contaminated soils , standing wate r i n th e we t are a • preven

t ingestio n o f

contaminated groundwate r • preven

t exposur e to contaminants i n th

e buildings , abovegroun

d an d undergroun

d tanks , an

d associate

d structure s

Pag e 3 o f 1 0Th e remedia l actio n objective s identifie dto mitigat e threats t o th

e environmen

t ar e a s follows :

• preven

t th e exposur e o f wildlif e to contaminated soil , sediments , an d standin g wate r i n th e we t are a • preven

t futur e wetland s contaminatio n fro msurfac e wate r runof f an d discharge Th e remedia l actio n wor

k pla n fo r th e SC Operabl

e Uni t (soi l treatment

) wa s finalize don Januar

y 11,199 0 an

d th e remedial , action s wer

e performe d betwee n Februar y 199 0 an d Octobe r o f 1990
. Th e remedia l action s (lon g ter

mmonitoring ) fo r

th e MO M Operabl

e Uni t bega n i n 199 1 an

d wer e completed i n Septembe r o f 2010
. Th e remedia l action s a

t th e Sit e wer e conducte

d an d enforce d unde

r a1989 Consen t Decre e betwee n EP A an d th e settlin g defendants
. C . INSTITUITONA

L CONTROL

S Th e managemen

t o f migratio n remed

y als o require d tha

t institutiona l controls ' (IC's ) b e placed o n th

e propert y to restric t

th e us e o f groundwate

r a t th e Site
. Th e IC' s wer e recorded wit h th

e Registr y o f Deed s i n Septembe

r o f 199 1 an d remain i n place
. Th

e IC' s prohibi t

an y groundwate

r use , prohibi t

excavatio n belo w th

e dept h o f th e groundwate

r table withou t

th e prio r approva l o f EP A an d MassDEP , an d limi t futur e us

e o f th e propert y to specifi c commercial , industrial an d municipal uses . MONITORIN

G RESULTS A . Managemen

to f Migratio n Operabl

e Uni t Th e MO M portio n o f

th e remed y include d a

n extensive groundwate

r monitorin g progra mto assur

e tha t groundwate

r contaminatio n abov

e th e Maximu m Contaminan

t Level s (MCLs ) di dnot

migrat e off-site , an

d to assur e tha t on-sit e contaminan

t level s naturall y attenuate d to level s belo w drinkin g wate r standards
. Th e lon g ter mgroundwater , sediment, surfac e an d see p monitorin g requirements ar e detailed.i n th

e repor t entitled : Lon g Ter

mGroundwate

r Monitorin g Plan , Cannon s Bridgewate

r Superfun d site , Bridgewater , Massachusetts , date d Jun e 1992 , prepare

d b y GE I consultants
. Thi s lon g ter msampling wa

s conducted a

t th e sit e fro m199 1 unti l 2010
. A s o f 2010 , al l contaminants o f concer n me t MCL's , wit h th

e exceptio n o f arsenic , i n severa

l onsit e monitorin g wel l locations
. However , o n Octobe r 23 , Pag e 4 o f 1 02012 , MassDE P conducted ane

w groundwate

r us e & value determinatio n specificall y fo r

th e Cannons Engineering Bridgewate r site
. As* aresult

o f thi s reevaluation , i t

wa s determined tha

t drinkin g wate

r standard s suc h a s MCL s ar

e n o longe r applicabl e o

r appropriat

e fo r groundwate

r cleanu p goal s becaus

e th e ingestio n o f

sit e groundwate

r i s no t a n exposur e pathway
. See-EPA' s Explanatio n o f Significan t

Difference s (ESD ) date

d Ma y 2013 , fo r

additiona l detail s an

d t o vie w acop

y o f th e groundwate

r us e an d value determination
. ' Prio r to conductin g th

e 201 2 groundwate

r us e an d value determination , th e 201 0 Fiv e Yea r Review (pag

e ES-3 ) anticipate d tha

t ove r time , arseni

c concentration s woul ddecreas

e naturall y to background level s a s th e aquifer gradually returned to amor e oxidize d state , no w tha t MCL' s fo r

bot h VOC s an

d SVOC' s hav

e bee n achieved on-site
. I n Marc h o f

2013 , EPA' s ris k

assesso r conducte d acumulativ e evaluatio n o f risk s fo r astandar d recreationa

l receptor . Thi s evaluatio n considered al l residua l groundwate

r contaminants an

d use d th e last thre e year s o f groundwate

r sampling dat afro m2008 , 2009 an

d 201 0 i n th

e ris k calculations
. Th

e result s o f

thi s cumulativ e ris k

assessmen

t determined tha

t th e huma n healt h risk s ar e withi n EPA' s acceptabl

e ris k rang e o f 1 x 10" 4 t o 1 x 10" 6
. A n evaluatio n o f

ecologica

l ris k du e t o exposur e o f aquatic organisms to on-sit e level s o f arseni c an d 1 , 4-dioxan

e i n groundwate

r wa s conducted
. Thi s evaluatio n assume d tha t eve n i f th e residua l concentration s o f

arseni c an d 1 , 4-dioxan

e emerge d int o surfac e wate

r i n th e wetland s to th

e west o f th e Site , ther

e woul db e n o actionable ris k

eve n i f ther e wer e n o dilutio n o f

th e maximu mconcentration s o f arseni c an d 1 , 4-dioxane
. Fo

r specifi c detail s abou

t these ris k

assessments , se

e th e ris k assessmen

t mem o whic h i s include d a

s Attachmen

t 2 , to th e Ma y 2013 , ES D Th e 2008 , 2009 , an

d 201 0 annua

l monitorin g report s ar

e include d i n th

e administrativ e recor

d an d i n th e deletio n docke

t fo r th e site
. B . Sourc e Contro l Operabl e Uni t Pos t confirmator

y sampling o f

th e excavate

d area s wa s conducted fo r Polychlorinate d Biphenyl' s (PCB's) , Volatil e Organi c Compounds (VOCs ) an d sem i volatil e organic compounds (SVOCs ) i n orde r to verif y tha t soil s wer e removed i n accordanc

e wit h th e remedia l design excavatio n levels
. Th e excavation s wer

e deeme d complet e onc e th e clea n u p level s wer

e verifie dvi a confirmator

y sampling
. Th

e attainmen

t o f th e soil s clea

n u p level s ar

e furthe r discusse d an d documente

d i n EPA' s 1991 , ICO Rfo r th e site
. ATTAINMEN

T O F GROUNDWATER RESORATIO N CLEANU P LEVEL S Se e abov e section III
. A , Monitorin g Results fo r th e Managemen

t o f Migratio n Operabl e Unit
. Pag e 5 o f 1 0V. SUMMAR Y O F OPERATIO N & MAINTENANC E REQUIRE D Th e responsible partie s (RP's ) wil l provide suppor t to EP A (a s directed) an

d EP A wil l conduc t futur e Fiv e Yea

r Review s a

t th e sit e to ensur e th e remedie s remai n protectiv e o f bot h huma n healt h an d th e environment
. Th

e RP' s shall adher

e to an d maintai n complianc e wit h th

e institutional controls/deed restriction s fo r th e Site
. A t som e poin t i n th e future , th

e RP' s ma

y nee d to properly abando

n th e groundwate

r monitorin g well s a

s directe d b y EPA , wit h MassDE P concurrence . VI . DEMONSTRATIO

N O F CLEANU P ACTIVIT

Y QA/Q C A . Managemen

to f Migratio n Operabl

e Uni t A qualit y assurance/qualit

y contro l pla

n (QA/QC ) established procedure s to b e followe dthroughout

th e duratio n o f

th e lon g ter mmonitorin g plan
. Th

e QA/Q C requirements ar

e include d i n section 3. 0 o f th e approved Long-ter

mGroun d Wate

r Monitorin g Plan , Cannons Bridgewate r Superfun d site , Bridgewater , MA , date d 1991
. Thi s pla

n wa s late r updated , a

t th e reques t o f EPA , t o include changing fro m sampling wit h bailer s to usin g low-flo w sampling protoco l techniques
. I n th e 200 5 Fiv e Yea

r Review , EP

A noted an

d recommende

d tha t RP' s us e a laborator y metho d whic h woul dachiev e alowe r reportin g limi t

fo r fou r SVOCs , hexachlorobenzene , atrazine , pentachlorophenol , an d benzo(a)pyrene
. Th

e RP' s implemente d thi s recommendation fo r subsequen

t sampling events . Furthermore , EP

A conducted spli t

sampling o f

th e groundwate

r fo r th e las t thre e year s o f annua l sampling performe d b y th e RP's
. Thes

e spli t groundwate

r samples wer e sen t fo r analysi s to EPA' s laborator y located i n Chelmsford , Massachusetts
. Comparison o f

th e tw o dat aset s indicate d tha

t th e result s wer

e comparable , thereby assurin g tha t appropriat

e QA/Q C requirements wer e bein g achieved
. B . Sourc e Contro l Operabl e Uni t I n orde r t o ensur e th e qualit y o f th e remedia l actio n activitie s bein g performed , Qualit y Contro l (QC ) procedure s wer e implemente d throughout th e remedia l actions
. Q

C procedure s wer

e als o use d t o assess th

e applicability o f

th e activitie s bein g performe d and , base d o n sit e conditions , correct

o r revis e thos e activitie s to ensur e tha t the y wer e consisten

t wit h th e objective s o f

th e remedia l action
. Thes e procedure s include d supervision , equipmen t calibration , documen

t review , inspection , audits , an

d dat avalidation
. Additionally , Q C suggestion s wer

e provide d b y EP

A an d ou r oversigh t representative o n a

n informa l (daily ) basi s an d o n aforma l basi s a

t weekly meeting s an

d wer e implemente d throughout th e remedia l action
. A descriptio n o f

th e majo r remedia l activitie s an

d th e Q C procedure s an

d Q C correctiv e action s implemente d fo r th e S C remedia

l action s Pag e 6 o f 1 0are described in further

detail in section 11.0of

the Remedial

Action Report, prepared b y Canonie Environmental , date d Octobe r 1991
. Furthermor

e th e 1991 , ICO Rdocument

s tha t al l appropriat

e soi l cleanu

p level s wer e achieved an

d wer e verifiedwit h confirmator y sampling i n th

e excavate

d areas . FIV E YEA R REVIEW

S
r Statutor

y Fiv e Yea

r Review s ar

e require d a

t th e sit e becaus e th e RO D wa

s signe d after th e Superfun d Amendments an d Reauthorizatio n Ac t

o f 198 6 (SARA ) an

d contaminants remain o n . th e Sit e abov e level s tha

t allo w fo r

unlimite dus

e an d unrestricte d exposure , i.e. , th e Sit e wa s remediated to commercial/industria l use . Th e followin g Fiv e Yea

r review s hav

e bee n completed fo r

th e CE C Site :

• 199 5 Fiv e Yea

r Review Repor

t
• 200 0 Fiv e Yea

r Review Repor

t
• 200 5 Fiv e Yea

r Review Repor

t
• 201 0 Fiv e Yea

r Review Repor

t Al l o f th e abov e liste d Fiv e Yea

r Review determined that :

• Th e sourc e contro l remedy , a

s documente

d b y EPA , wa

s complet e i n 1991 , an

d judge d b y EP

A to stil l b

e protectiv e

• Th e groundwate

r remed y fo r th e Canno n Engineerin g Corp
. Sit

e i s expecte d to b e protectiv e o f

huma n healt h an d th e environmen

t upon completion , an

d i n th e interim , exposur

e pathway s tha

t coul d resul

t i n unacceptabl

e risk s ar e being controlle d throug h institutional controls
. Th e followin g ar

e th e sit e related issues tha

t wer e identifie di n th

e 201 0 Fiv e Yea

r Review : 1
. N o sampling ha s bee n conducted fo r

1,4-dioxane , a

s i t wa s not a well-know n chemica

l a t th e time th e monitorin g plan wa

s established
. 2
. Groundwate

r concentration s i n 7 o f

th e Sit e monitorin g well s exceede d th e MC L fo r

arseni c i n th e Yea r 1 9 data
. 3
. Durin g th

e intervie w process , severa l Tow n official s indicate d tha t the y wer e unfamilia

r wit h th e histor y o f th e Sit e an d wer e not awar e o f th e dee d restrictio n requirements
.

Pag e 7 o f 1 0Th e followin g action s wer

e take n t o addres s th

e issue s tha

t wer e identifie di n th

e 201 0 Fiv e Yea

r Review : 1
. Th e RP ' s sample

d fo r 1,4-dioxan

e durin g th

e 201 0 annua

l sampling event . Th

e 201 3 cumulativ e ris k

assessmen

t evaluated risk s fro m1,4-dioxan

e an d determined tha

t th e remainin g level s i n groundwate

r ar e withi n EPA' s acceptabl e ris k range o f 1 x 10" 4 to 1 x 10" 6
. Therefor

e th e remainin g leve l o f

1,4-dioxan

e i n groundwate

r i s protectiv e o f

bot h huma n an d ecologica

l health
. 2
. Th e 201 3 ES D removed th

e requiremen

t to reac h MCL's.fo r

al l contaminants o f

concer n i n groundwater
. Th

e us e o f sit e groundwate

r fo r drinkin g wate

r i s not reasonabl y foreseen , an

d ther e i s n o curren t o r futur e completed pathwa y fo r huma n healt h exposur e to groundwater
. Recreationa l an d aquatic organis m pathway s to surfac e wate r exposure s wer

e evaluated
. Th

e 201 3 cumulativ e ris k

assessmen

t (attachmen

t 2 o f th e 201 3 ESD ) evaluated potentia

l risk s fro mal l residua

l groundwate

r contaminatio n (includin g arseni c an d 1,4-dioxane

) an d determined tha t th e remainin g level s i n groundwate r ar e withi n EPA' s acceptabl e ris k rang e o f 1 x 10" 4 t o 1 x 10" 6
. Therefor e th e remainin g level s o f

contaminatio n i n th

e groundwate

r ar e protectiv e o f

bot h huma n an d ecologica

l health
. Also , th

e 201 0 Fiv e Yea r Review state

d tha t "I t i s likel y tha

t th e arseni c ; exceedances , a

s wel l a s th e elevated iro n an

d manganes

e concentrations , ar

e indicativ e o f

areducin g environmen

t associate d wit h chlorinate d organic contamination , an d tha t th e arseni c wil l becom e adsorbe d and/o r precipitat

e a s th e aquifer gradually return s to amor e oxidize d state . 3
. A cove

r lette r an d acop y o f th e 201 0 Fiv e Yea

r Revie w wa

s provide d to th

e cler k an d healt h agen t fo r th e Tow n o f Bridgewater
. Th

e cove r lette r als o reiterate d th

e institutiona l contro l requirements
. SIT E COMPLETIO N CRITERI A Th e remedia l action s whic h hav

e bee n implemente d fo r

th e SC an d MO M operabl

e unit s achieve s th

e clea n u p requirements identifie di n th e 198 8 RO D an

d th e 201 3 ES D fo r th e Site
. Furthermor

e th e remainin g sit

e relate d contaminant s i n ar e protectiv e o f

bot h huma n healt h an d th e environmen

t an d ar e withi n EPA' s acceptabl e ris k rang e o f 1 x 10" 4 to 1 x 10" 6 fo r

al l appropriat

e exposur e pathways
. Al l o f th e selecte d remedia

l an d remova l action s an

d th e remedia l actio n objective s an d associate

d cleanu p goal s ar e consisten

t wit h th e Comprehensive Environmenta l Pag e 8 o f 1 0Response , Compensation , an d Liabilit y Ac t

(CERCLA) , th

e National Contingency Pla n (NCP ) an

d EP A polic y an

d guidance
. Al l Institutional Control s ar e i n plac e an

d currently EP

A expect s tha t n o furthe r Superfun d response i s neede d to protect

huma n healt h an d th e environment , excep t futur e Fiv e Yea

r Reviews
. IX . BIBLIOGRAPH

Y

• Long Term Groundwater Monitoring Report

Plan, Cannons Bridgewater Superfund

Site Bridgewater, MA, dated June 1992, prepared

by GEI consultant.

• Final Report, Remedial

Investigation, Cannons Engineering Corporation Site, Bridgewater, MA, prepared by Ebasco Services Inc., dated May 1987.

• Record

of Decision (ROD), Cannons Engineering Corporation (CEC) Site, Bridgewater, MA, prepared by EPA, dated

March 1988.

• Superfund

Site Interim Close Out

Report (ICOR), prepared

by EPA, dated September

1991.

• Remedial

Action Report

Cannons Bridgewater

Superfund

Site, dated October 1991, prepared

by Canonie
.

• Groundwater

Monitoring and

Reporting - September

2008- Year

18 Cannons Engineering Superfund Site, Bridgewater, Massachusetts, prepared by Roux Associates Inc., dated

March 2009.

• Groundwater

Monitoring and

Reporting - September

2009- Year

19 Cannons Engineering Superfund Site, Bridgewater, Massachusetts, prepared by Roux Associates Inc., dated

January 2010.

• Groundwater

Monitoring and

Reporting - September

2010- Year

20 Cannons Engineering Superfund Site, Bridgewater, Massachusetts, prepared by Roux Associates Inc., dated

February 2011.

• ' Explanation of

Significant

Differences (ESD), The Cannons Engineering Bridgewater

Superfund

Site (CEC), Management of Migration Operable Unit, prepared

by EPA, dated

May 2013.

Pag e 9 o f 1 0

# 3- '3

le s T
. Owens III , Directo r ffic e o f Sit e Remediatio n an

d Restoration JSEP A Ne w England - Regio n 1 5 Pos t Offic e Square , Suit

e 10 0 Boston , M A 02109-391 2 Dat e

Pag e 1 0 o f 1 0