SDM S DocI D 00021292 2

8UPERFDN

D SITE IHTERIM

CLOS E OUT REPOR T

Cannon s Engineerin

g Corporation (CEC ) Sit e Bridgewater , Massachusett s Septembe r 30 , 199 1I . SUMMAR Y OF SIT

E CONDITION

S Background : The Cannon s Engineerin g Corporation (CEC ) facilityi s a seven acr e Sit e (CE C Bridgewate r Sit e o r Site ) locate d i n a smal l industria l par k i n the western par t o f the Tow n o f Bridgewater , Massachusetts . I t i s one o f fou r separat e bu t relate d site s whic hfor

mth e Cannons Site s Group . Th e other s ar e Cannon s Plymout hi n Plymouth , Massachusetts ; Tinkham' s Garag e i n Londonderry , Ne wHampshire ; and Gilso n Roa d i n Nashua , Ne w Hampshire . Al l fou r site s ar e being handle d unde r on e enforcemen t effort . The CE C Bridgewate r Sit e i s locate d i n the southeaster n portion o f the Tow

n Rive r watershe d whic hha s an estimated are a o f 5 6 squar e mile s an

d feed s wate r suppl ywell s fo r the towns o f Bridgewater , Wes t Bridgewater , and Raynham . Hockomoc k Swam p occupie s a larg e portio n o f th e watershed . Lak e Nippenicke t i s th e larges t surfac e wate r bod ylocate d withi n 1 mil e o f th e Site . The neares t drinkin

g wate r well , operated b ythe Tow

n o f Raynham , i s locate d 1. 3 mile s wes t o f the Sit e o n the shor e o f Lake Nippenicket . CE C firs t purchased the parce l o f lan d a t the Sit e i n November , 1974 . Th e propert ywa s develope d b ythemt o handle , store , an d incinerat e chemica l wastes . Thes e activitie s occurre d frequentl y a t the Sit e betwee n 197 4 an d November , 198 0 whe n operation s a t the Sit e ceased afte r the Massachusett s Departmen t o f Environmenta l Protectio n (MADEP) , the n th e Departmen t o f Environmenta l Qualit yEngineerin g (DEQE) , revoke d CEC' s Wast e Licens e citing documen t falsification an d othe r wast e reportin g violations . Ove r 70 0 drums an d approximatel y155,00 0 gallon s o f liqui d wast e and sludg e i n bul k storag e wer e lef t behind on-sit e b yCEC . Betwee n 198 0 an d 1982 , th e MADE P an d th e Unite d State s Environmenta l Protection Agenc y(EPA ) conducte d Sit e inspections , performe d sampling an d analyse s an

d confirme d the presenc e o f chemica l contaminatio n a t th e Site . Severa l tank s an d drum s wer e als o observe d t o b e leaking . I n orde r t o alleviat e th e proble m o f leaking contaminatio n an d waste s lef t on-site , the MADE P performe d a remova l action a t the Site . I n Octobe r 1982 , MADEP' s contractor , Je t Lin e Services , Inc. , remove d approximatel y 155,00 0 gallon s o f sludg e an d liqui d waste s stored i n tank s an d 71 1 drum s fro

mthe Site . Asubsequent remova l wa s conducted b y th e Potentiall yResponsibl e Part yGrou p (PR P Group ) i n Jun e 1988 . Th e PR P Grou

p remove d fromth e Sit e th e bul k content s o f an underground tank , a septi c tank , 3 tanke r trailer s and small , 5 gallo n o r less , container s fro mlaborator

yan d storag e areas . Remedia l Plannin g Activities ; Base d o n informatio n obtaine d during th e Sit e inspection s an d th e sampling an

d analysi s performe d betwee n 198 0 an d 1982 , EP

A propose d th e Sit e fo r inclusio n o n th e Nationa l Prioritie s Lis t(NPL ) i n Decembe r 1982 . Th e Sit e wa s listed on th e NP L on Septembe r 8 , 1983 . Immediatel yfollowing , EPAentere d int o a contrac t wit hEbasc o Services , Inc . fo r th e performanc e o f a Remedia l Investigation (RI ) fo r th

e Sit e which assesse d th e degre e o f on-sit e 

### contaminatio n presen t i n th e air , soils , sediments , surfac e wate r an d groundwater . The R I wa s complete d i n Ma y198 7 an

d had detecte d contamination i n al l media , howeve r significan t 

### concentration s wer e presen t onl yi n soi l an d groundwate r a s summarized below . Surfac e soi l sample s determine d tha t severa l volatil e and semi

volatil e organi c compound s wer e presen t a t 1 5 o f 2 1 sampling locations . Th e maximu mconcentration s o f th e mos t prevalen t volatil e organic s detected wer e 51,00 0 part s pe r billio n (ppb ) benzene , 26,95 0 ppb toluen e and 18,00 0 ppb chlorobenzene . Maximumconcentration s o f th e mos t prevalen t semi-volatil e organic s wer e 30,00 0 ppb bis(2-ethylhexyl)phthalate , 3,60 0 ppb 4

- methylpheno l and 1,20 0 ppb phenol . Polychlorinate d biphenyl s (PCBs ) wer e detected a t 1 1 o f the sampling location s a t tota l concentration s ranging fro m3 9 t o 96,08 0 ppb . Pesticide s wer e detecte d a t 6 o f th e samplin g location s a t lo wconcentration s wit ha maximu

mo f 1 5 ppb . Subsurfac e soi l sample s wer e taken a t depth s rangin g fro m2 t o 2 2 fee t an d resulte d i n the detectio n o f volatil e organic s i n 1 9 o f 2 8 sample s a t tota l concentration s a s hig ha s 53 1 ppb . Semi

volatil e organic s wer e detecte d i n onl y6 sample s a t a maximu m tota l concentratio n o f 6,49 3 ppb . Th e pesticid e heptachlo r wa s foun d a t ver

ylowconcentration s (0. 9 ppb ) a t 2 locations . No PCB s wer e detecte d i n an ysoil s belo w2 feet . Groundwate r result s fo r th e R I wer e obtaine d fro m3 samplin g round s o f monitorin g wells . Round 1 o f th e sampling occurre d o n 

### Jul y1 7 t o 19 , 1984 ; roun d 2 o f the sampling occurred on Augus t 22 , 1984 ; an

d roun d 3 o f th e samplin g o n Septembe r 1 0 an d 11 , 1984 . Th e presenc e an d degre e o f volatil e organi c contaminatio n varie d widel ybetwee n well s an d samplin g event s wit htota l concentration s ranging fro m6 t o 55 0 ppb . Th e maximum concentration s foun d wer e 39 0 pp

b xylenes , 35 0 pp

b trans-1,2

- dichloroethen e an

d 16 0 ppb ethylbenzene . Mos t well s showe d tota l volatil e contaminatio n t o b e les s than 5 0 ppb . Semi-volatil e organi c compound s wer e detecte d a t lowconcentrations i n 7 well s i n roun d 1 , 9 well s i n roun d 2 an d n o well s i n roun

d 3 . Phthalate s wer e th e principa l semi-volatile s detected . PCB' s an d pesticide s wer e no t detecte d i n an yo f th e sampling rounds . Base d o n th e orientatio n o f dat a obtained , i t wa s foun d tha t contaminatio n i n th e groundwate r wa s associate d wit h contaminatio n i n th e soils . Acomplet e descriptio n o f th e Sit eresult s an d analysi s can be foun d i n the Remedia l Investigation (RI ) report. 1 Concurren t with th

e RI , a n Endangermen t Assessmen t (EA) 2 wa s conducte d b

yEbasc o Services , Inc . t o asses s potentia l threat s t o 

### publi c health , welfare , an d the environmen t resultin g fro m contaminatio n a t the Site . The E Awa s base d o n dat a collected during th e R I an

d served a s a baselin e ris k assessment . Th e informatio n an

d dat a obtaine d during th e R I an d E Awer e use d 

### t o develo p a Feasibilit yStud y(FS) 3 

### whic hinitiall yscreened a 

### fiel d o f alternative s fo r remediatio n an d then carefull y evaluate d severa l o f the mor e feasibl e alternative s a s require d 

### unde r the Nationa l ContingencyPlan , 4 0 CFR Par t 300 , an d Sectio n 12 1 o f th

e Comprehensive Environmenta l Response , Compensation , and Liabilit yAc t (CERCLA) . A s a resul t o f th e fina l FS , whic h wa s complet e i n Januar yo f 1988 , the nin e evaluation criteria , foun d i n EPAguidanc e documen t "Additiona l InterimGuidanc e fo r FY '8 7 Record s o f Decision " date d Jul y24 , 1987 , wer e used t o compar e an

d analyz e the following Sourc e Contro l (SC ) an d Managemen t o f Migration (MM ) alternatives : 

### (SC-1 ) Minima l N

o Action , Restric t Acces s (SC-2 ) On-sit e cove r syste m (SC-3 ) Solidificatio n an d Stabilization , On-sit e RCR A landfill/Off-sit e incineratio n (SC-4 ) Solidificatio n an d Stabilization , Off-sit e RCR A landfill/off-sit e incineratio n (SC-5 ) On-sit e Aeration/Off-sit e incineratio n (SC-6 ) On-sit e incineratio n (SC-7 ) Off-sit e incineratio n (MM-1 ) No Actio n wit hMonitoring (MM-2 ) Pum

p an d Trea t b

yUV-Photolysis/Ozonation (MM-3 ) Pum

p and Trea t b

yAi r Stripping (MM-4 ) Pum

p an d Trea t b

yCarbo n Adsorption (MM-5 ) .Pum

p an d Trea t b

yRevers e Osmosi s (MM-6 ) Pum

p an d Trea t b

yAi r Stripping/Activated Carbon (MM-7 ) Pum

p an d Trea t Off-sit e

1 Th e Remedia l Investigation , Feasibilit yStudy , Endangermen t Assessment , Record o f Decision , an d al l othe r document s use d i n suppor t o f th e remedia l actio n decisio n proces s ar e compile d i n th e CE C Bridgewate r Sit e Administrativ e Recor d an d ar e availabl e fo r revie wb

ycalling th e EPARegio n 1 offic e a t (617 ) 573-5729 . Th e Administrativ e Recor d i s als o availabl e fo r reviewa t a Sit e repositor

ywhic hexist s a t th e Bridgewate r Publi c Library . 2 Se e footnot e 1 . 3 Se e footnot e 1 .On Februar

y11 , 1988 , EP

Ahel d an informationa l meeting wit h the publi c t o discus s th e abov e clean-u p alternative s whic hwer e presente d i n the (FS ) an d announc e the Agency' s Proposed Plan fo r remediation . Athre e week publi c commen t perio d wa s initiate d a t tha t tim e t o accep t written comment s o n the alternative s an d 

### selecte d remedy . Apubli c meeting wa s then hel d o n Februar y25 , 198 8 t o solici t an

yora l comments . Response s t o al l comment s receive d wer e documente d an d can b e foun

d i n th e Responsivenes s Summar yportion o f the Record o f Decision* . On Marc h31 , 1988 , EPA' s Regiona l Administrato r issued a Recor d 

### O f Decision (ROD ) documenting the selected remed yfo r the Sit e whic hwa s a combinatio n o f alternative s (SC-1) , (SC-3) , (SC-5 ) an d (MM-1 ) t o includ e bot h sourc e contro l an d managemen t o f migratio n components . I n summary , th e sourc e contro l portio n o f th e remed yprovide d fo r fencing th e entir e Sit e are a t o restric t access , on-sit e therma l aeratio n o f soil s contaminate d wit h volatil e organi c compound s (VOCs ) t o level s establishe d afte r additiona l sampling , and off

sit e incineratio n o f PC B contaminate d soil s i n exces s o f 9 ppm . I n addition , building s an d tank s on-sit e wer e t o b e decontaminate d and remove d and soil s unde r thos e structures , alon g wit hothe r soi l locations , wer e t o b e sampled . An y contaminate d soil s tha t wer e determine d t o requir e treatmen t base d o n a threa t t o huma n healt hand th e environmen t wer e t o b e remediate d b

yon e o f th e selecte d soi l treatmen t technologies . Th e managemen t o f migratio n portio n o f th e remed yinclude s a groundwate r monitoring programt o assur e tha t contaminatio n abov e th e Maximu mContaminan t Level s doe s no t migrat e off-sit e and t o assur e tha t contaminan t level s on-sit e naturall yattenuate . I t i s estimate d tha t groundwate r cleanu p targe t levels , base d o n th e ingestio n o f on-sit e groundwater , wil l b e achieve d withi n 1 5 t o 2 0 years . Th e managemen t o f migratio n remed yals o require s tha t institutiona l control s restricting th e us e o f groundwate r b e place d o n th e Site . Fo r a descriptio n o f th e institutiona l controls , se e section I V o f thi s report . A s require d i n the ROD , i n Decembe r 198 8 the Cannon s Site s Potentiall yResponsibl e Part yGrou p (PR P Group ) retained a contracto r t o conduc t a pre-desig n stud ysampling progra

mt o furthe r defin e th e contaminate d area s a s outline d i n th e ROD . Th e Pre-Design Stud yReport , whic hdocument s th e ful l exten t o f contaminatio n a t th e Site , wa s approve d b yEPAi n Februar

y1989 . Th e dat a collecte d during th e pre-desig n stud ysampling progra

m wa s evaluate d i n th e Remedia l Design Report , January1990 , from whic h remedia l desig n excavatio n level s wer e established . A

4 Se e footnot e 1 .Consen t Decre e wit h the PRP Grou p becam e effective on Augus t 14 , 198 9 unde r which , i n Januar y1990 , th

e PRP Grou

p complete d th

e Remedia l Design an

d Remedia l Actio n Wor k Plan . EPAapprove d th e fina l Wor k Plan fo r th e Sit e i n February , 1990 . Remedia l design an d action s wer e conducte d b ythe PR P Grou

p wit h EPAan

d MADE P 

### oversight . Remedia l Construction Activities ; As required i n the ROD , fencin g o f the Sit e perimete r t o restric t uncontrolle d acces s wa s complete d i n Decembe r 1988 . A s par t o f th e Remedia l Design , an asbesto s inspection wa s conducte d on-site . Asbestos-Containing Material s (ACMs ) wer e foun d i n severa l o f th

e buildings . .To assur e worke r protectiveness , abatemen t o f th e ACM s wa s initiate d o n Decembe r 2 , 1989 , prio r t o an ydemolitio n activities . Al l ACM s wer e doubl e bagge d an

d drumme d o r crated fo r subsequen t off-sit e disposa l a t Chemica l Wast e Management' s Mode l City , Ne wYork Landfill . Th e abatemen t o f ACM s wa s performe d i n accordanc e wit h al l applicabl e regulation s and post-sampling confirme d ai r qualit ywa s withi n acceptabl e standards . Following a brie f perio d o f on-sit e storage , off-sit e disposa l o f al l ACM s wa s complet e o n Apri l 25 , 1990 . Decontamination , demolitio n an d disposa l o f al l on-sit e structures , including buildings , storag e tanks , pipin g and a n electrica l transformer , wa s initiate d o n Februar y8 , 1990 . Al l material s wer e sample d and subsequen t prope r disposa l wa s determine d a s follows :



### Concret e wa s crushe d on-sit e wit han hydrauli c crushing arm . Al l mes hand reba r wa s separate d and remove d usin g an electromagnet . Thirty-seven load s o f crushed concret e wer e abl e t o b e recycle d fo r road application s b yth e Simeon e Corporatio n i n Stoughton , Massachusetts . A n additiona l four load s wer e landfille d a t a non hazardou s Browning-Ferri s Industrie s (BFI ) facilit yi n Fal l River , Massachusetts . Two load s wer e shipped , a s par t o f th e hazardou s wast e debri s liste d below , t o th e Chemica l Wast e Management' s Mode l City , Ne wYork Landfil l (CW

M Facility) . Twelve-hundre d cubi c yard s o f scra p meta l wer e sen t t o the Prolerized recyclin g facilityi n Everett , Massachusetts . Two-hundred-fort ycubi c yard s o f non-hazardou s demolitio n debri s wer e dispose d o f a t a BF I facilit yi n Fal l River , Massachusett s an d one-hundred-twent y additiona l cubi c yard s wer e dispose d o f a t th e Ravenbroo k Landfil l i n Nort hCarver , Massachusetts .

### Two hundre d gallon s o f dielectri c flui d an d rinsat e fro mthe electrica l transforme r wer e incinerated a t Genera l Electri c i n Pittsfield , Massachusetts .

• The electri c transforme r carcas s wa s recycled a t Thre e C Electrica l Testin

g i n Ashland , Massachusetts .

• Two-hundred-fortycubi c yard s o f hazardou s wast e debri s wer e dispose d o f a t the CW M Facility . Al l rinsat e tha t wa s generate d during th e decontaminatio n o f th e building s wa s pumpe d int o an on-sit e tanke r truck fo r storage . I t wa s late r treated on-sit e throug hthe liqui d phas e carbon uni t whic hwa s par t o f the LowTemperatur e Therma l Aeratio n Uni t (LTTA) 5 

### used fo r treatin g the VOC contaminate d soils . Th e Remedia l Design Repor t identifie d four PC B soi l contaminate d areas . Excavatio n o f thes e area s wa s initiate d o n Ma y9 , 1990 . Atota l o f 396.6 5 ton s o f PC B contaminate d soil s wer e excavated , transporte d off-sit e an d incinerate d a t th e Aptu s Environmenta l Incineratio n Facilit yi n Coffeyville , Kansas . Post-excavatio n confirmator

ysample s verifie d tha t PC B concentration s i n th e remainin g soil s wer e belo wth e 9 pp mleve l establishe d i n th e ROD . PC B soi l excavation s wer e backfille d wit ha clean-fil l materia l completing thi s actio n o n Augus t 24 , 1990 . Th e Remedia l Design Repor t als o identifie d seve n discret e VO C soi l contaminate d areas , tw o "We t Areas " and fiv e "Uplan d Areas" , whic hrequire d excavatio n an d treatment . "Upland " are a soil s wer e als o found t o contai n semi-volatil e organi c compound s (SVOCs ) whic hrequire d treatment . A s prescribe d i n th e ROD , VO C and SVO C soi l remedia l desig n excavatio n level s and therma l aeratio n treatmen t level s wer e establishe d fo r bot hth e "Wet " an d "Upland " area s a s par t o f th e remedia l desig n and ar e liste d i n th e attache d tabl e a t th e en d o f thi s report . Th e excavatio n level s wer e determine d i n par t fro mth e result s obtaine d durin g a Ground Wate r Modelin g Stud ywhic hwa s complete d i n February , 1989 . 

### A s show n i n th e attache d table , severa l VO C compound s foun d i n th e uplan d are a soil s hav e "dashes " fo r therma l aeratio n treatmen t levels . Thes e VO C compound s had greate r volatilit y tha n th e others . Therefore , treatmen t level s fo r upland are a VO C soil s wer e se t usin

g targe t compounds . The targe t compound s wer e selecte d o n a basi s t o insur e tha t treatmen t t o thei r respectiv e therma l aeratio n treatmen t level s woul d assur e prope r treatmen t o f al l compound s o f greate r volatility .

5 

### LTT Ai s a registere d trademar k o f th e Canoni e Environmenta l Service s Corporation .Betwee n Jun e 11 , 199 0 an d Octobe r 10 , 1990 , a tota l o f 11,33 0 ton s o f VOC contaminated soil s wer e excavated an d thermall y aerate d on-sit e using the LowTemperatur e Therma l Aeratio n Uni t (LTTA) . Post-excavation confirmator ysampling verifie d tha t VO C contaminated soi l remova l t o th e remedia l desig

n excavation level s wa s achieved . Post-treatmen t confirmator ysampling verifie d tha t VO C contaminate d soi l treatmen t t o the therma l 

### aeration treatmen t level s wa s achieved . The VOC treate d soi l wa s replace d on-sit e a s par t o f the excavatio n fil l material . The Managemen t o f Migratio n componen t o f the remed yinclude d the installatio n o f 6 ne woverburde n monitoring well s and 3 ne w 

### bedroc k monitoring well s fo r the lon g ter mmonitoring o f groundwate r quality , a s discussed mor e full yi n sectio n I V o f thi s report . Th e fina l fiel d activit yinvolve d Sit e restoration . Thi s include d approximatel y35,00 0 squar e fee t o f wetland s whic h ha d 6 0 cubi c yard s o f clean-fil l an d 50 0 cubi c yard s o f topsoi l materia l adde d and wa s regrade d and seeded . Al l fil l materia l wa s sample d an

d foun d t o b e fre e o f contamination . Th e entir e 

### uplan d area , approximatel y99,00 0 squar e feet , als o wa s backfille d wit hth e treate d VO C an d SVO C soil s an

d wa s regrade d an d seeded . Drainag e an d erosion control s wer e implemente d a s par t o f the fina l Sit e restoration activities . The Sit e restoratio n activitie s wer e essentiall ycomplet e o n Decembe r 10 , 199 0 wit h th e exceptio n o f si x covere d rolloff s o f hazardou s material s store

d on-sit e an

d som e additiona l re-vegetation . Fina l remedia l actio n Sit e activitie s occurre d i n Jul y1991 . On Jul y19 , 1991 , the si x rolloff s o f stored hazardou s material s wer e remove d fro

mth e Sit e and fina l grading , seeding , and mino r landscapin g activitie s wer e complete d shortl ythereafter . Communit yRelation s Activities ; Throughou t th e Site' s history , communit yconcern an d involvemen t ha s bee n lo wt o moderate . However , on e citizen' s group , Bridgewate r "AWARE" , ha s maintaine d interes t i n activitie s occurring a t th e Site . I n 1982 , EPArelease d a communit y relation s pla n whic hha s kep t thi s grou p an d othe r interested partie s informed throug h activitie s such a s informationa l meetings , fac t sheets , pres s release s an d publi c meetings . I n addition , a s par t o f the groundwate r monitorin g program , educatio n program s including publi c meeting s and presentation s will-b e undertake n t o increas e publi c awareness . Also , copie s o f al l monitoring dat a wil l b e supplie d t o th e Tow n o f Bridgewate r 

### a s wel l a s adjacen t propert yowners .8

II . DEMONSTRATIO N O F QA/Q C FRO M

CLEANU P ACTIVITIE S Prio r t o the initiation o f remedia l activities , a Quality Assuranc e Projec t Pla n (QAPP ) wa s develope d specificall yfo r the Cannon s Engineerin

g Corporation Bridgewate r Sit e i n January , 1990 . The purpos e o f the QAP P i s t o indicat e the prime 

### responsibilitie s an

d prescrib e the necessar yprocedure s required t o assur e tha t the projec t i s executed i n a manne r consistent wit hth e Nationa l Oi l an d Hazardou s Substanc e ContingencyPlan (NCP) ; th

e Comprehensive Environmenta l Response , Compensation , an d Liabilit yAc t (CERCLA ) an d th e Superfun

d Amendment s an

d Reauthorizatio n Ac t (SARA) ; applicabl e U.S . EPAguidanc e documents ; an

d wit h generall yaccepted an d approve d EP

Aquality assuranc e objectives . During th e remedia l activitie s a n EPAcontracto r provide d oversigh t o f fiel d activitie s including sampl e collections , equipmen t calibrations , an d measurement s an

d analyse s followin

g protocol s establishe d i n th e QAPP . Additionally , EPAan d thei r oversigh t contracto r provide d QC suggestion s on a n informa l (daily ) basi s and o n a forma l basi s a t weekl ymeetings . A n on sit e laborator

ywa s utilize d fo r al l post-treatmen t an d post
excavatio n confirmator yVO C samples . Th e on-sit e laborator ywa s audite d twic e b

yEPAQA/Q C personne l prio r t o an d during operations . Al l othe r analyse s wer e conducted a t off-sit e laboratorie s following establishe d chai n o f custod yprotocols . Dat a qualificatio n package s wer e submitte d and accepte d b yth e EPAfo r al l off-sit e laboratories . Validatio n report s verifying th e usabilit yo f analytica l dat a wer e submitte d periodicall yt o th e EPAthroughou t th e remediation . Al l analytica l dat a wa s foun d t o b e useabl e and al l validatio n report s wer e accepte d b yth e EPA .

III . MONITORINGRESULT S Adequat e ai r monitoring and confirmator ysamplin g program s wer e conducte d throughou t the remedia l activitie s t o protec t on-sit e personne l an

d th e surrounding publi c fro mexposur e t o hazardou s material s an

d t o verif ytha t specified cleanu p level s cited i n th e RO D wer e bein

g obtained . Th e monitoring an d samplin g progra

m included :

• Ai r samplin g fo r Volatil e Organi c Compound s (VOCs) , Tota l Suspende d Particulate s (TSPs ) an d Poly

chlorinate d Biphenol s (PCBs ) an d ai r monitorin g wit h direc t readin g instrument s fo r VOCs .Win d directio n monitoring an d upwind/perimete r ambien t ai r sampling o f VOC s an d TSP s t o verif ybackgroun d conditions .

• Work are a an

d personne l ai r sampling .

• Post-excavatio n confirmator yPC B soi l sampling t o verif yremova l t o concentration s belo wth e 9 pp mactio n limi t specifie d i n the Work Plan .



### • Post-excavatio n confirmator yVO C and , wher e necessary , SVO C soi l sampling t o verif yremova l t o concentration s belo wth e Remedia l Design Excavatio n Level s (RDELs ) 

### specifie d fo r eac hVO C i n the Work Plan .

• Hourl ypost-treatmen t sample s wer e collecte d fro mth e 

### LowTemperatur e Therma l Aeratio n Uni t (LTTA ) an d analyze d i n an on-sit e lab t o verif yVO C soi l treatmen t t o concentration s belo wth e require d therma l aeratio n treatmen t level s specifie d i n the Work Plan . Al l excavation s wer e conducte d i n location s wher e PC B o r VO C remova l wa s necessar yt o achiev e th e level s a s establishe d i n th e RO D and design documents . Overall , a tota l o f 11,33 0 ton s o f VO C and SVO C impacte d soil s wer e excavate d and thermall yaerate d on sit e an d 396.6 5 ton s o f PC B impacte d soil s wer e excavate d an d incinerate d off-site . Thes e remova l quantitie s wer e sufficien t t o satisf yth e specifie d clean-u p level s a s verifie d b yth e confirmatorysamplin g programs . Result s o f th e ai r monitorin g programdemonstrat e tha t on-sit e personne l wer e no t subjec t t o working environment s abov e th e Permissibl e Exposur e Limit s (PELs ) o r th e Threshol d Limi t Value s (TLVs ) an

d tha t th e loca l publi c wa s no t adversel yaffecte d b y an ySit e emissions . Complet e documentatio n o f th e ai r monitorin g and confirmator y samplin g program s can b e foun d i n th e Remedia l Actio n Report .

IV . SUMMAR YO F LONG-TERM RESPONS E ACTIO N (LTRA ) AN D OPERATIO KAN D MAINTENANC E Th e Recor d o f Decisio n include s a managemen t o f migratio n portio n o f th e selecte d remed ywhic hinvolve s restrictin g th e us e o f groundwate r a t th e Sit e and implementing a wate r qualit y monitorin g program . The purpos e o f thi s programi s t o observe th e distribution , migratio n and lessening o f contaminan t level s on-sit e ove r tim e throughnatura l attenuation . I t i s estimate d tha t groundwate r cleanu p targe t levels , base d o n th e ingestio n o f on-sit e groundwate r includin g 5 pp b Benzene , 5 pp b1 0



### Trichloroethylen e and 2 ppb Viny l Chloride , whic hwoul d allowfo r unrestricte d wate r use , wil l be achieve d withi n 1 5 t o 2 0 years . T o accomplis hthi s goal , a Long-Ter mGroun d Wate r Monitorin

g Plan ha s bee n develope d an d implemente d b

yth e PR P Group . Thi s pla n include s samplin

g locations , frequency , analytica l requirements , samplin g procedure s an d reportin

g requirement s t o b e followed b y the PR P Grou

p throughou t the operatio n an d maintenanc e period . A t thi s time , al l well s ar e i n plac e fo r performanc e o f th e monitorin g pla n an

d th e firs t roun

d o f sampling ha s bee n conducted . A

n appropriat e leve l o f qualitycontro l an d dat a validatio n i s incorporate d i n the plan . Specifically , the plan call s fo r sampling b ythe PRP Grou

p o f groundwater , surfac e wate r an d sediment s fo r VOC s an d SVOC s a t regula r intervals . Generally , mos t VO C samplin g wil l b e conducte d quarterl yand mos t SVO C samplin g wil l b e conducte d annuall yfo r th e firs t 2 years . Thereafter , th e samplin g frequenc ywil l b e re-evaluate d b yEP Aand th e MADE P and mayb e amende d a s necessar ybase d o n collecte d dat a and developin g trends . A s a result , th e samplin g frequenc ycoul d increas e o r decrease . A t thi s tim e however , annua l samplin g o f VOC s and SVOC s i s anticipate d t o yea r 1 0 an d biennia l samplin g fro myea r 1 0 t o yea r 20 . On e monitoring wel l wil l b e sample d fo r PCB s annuall yfo r th e firs t 2 year s t o verif yth e effectivenes s o f tha t portio n o f th e sourc e contro l remedy . Acomplet e descriptio n o f th e groundwate r monitorin g programca n b e foun d i n th e Long-Ter

mGroun d Wate r Monitoring Pla n fo r th e CE C Bridgewate r Site , Augus t 1991 . Afina l closeou t repor t wil l b e issued fo r th e Bridgewate r Sit e upo n achievemen t o f al l groundwate r cleanu p targe t level s and completio n o f th e long-ter mgroun d wate r monitoring program . Th e fina l closeou t repor t wil l b e a supplemen t t o th e interi m closeou t repor t an

d contai n specifi c informatio n concerning th e ground wate r monitoring program . T o assur e the safet

yo f publi c healt han d the environment , institutiona l controls , i n th e for mo f dee d restrictions , ar e necessaryand hav e bee n place d o n th e tw o parcel s o f lan d tha t compris e th e Site . Th e dee d restrictions : 1 . limi t propert yus e t o commercia l o r industria l 

### application s only , 2 . prohibi t th e us e o f groundwate r ove r th e entir e Site , 3 . an d prohibi t excavatio n on-sit e t o depth s belowthe groundwater . Consisten t wit hMassachusett s law , th e dee d restriction s requir e tha t th e Sit e owners , o r thei r successors , record a subsequen t

### 1 1

notic e o f the dee d restriction s befor e the expiration o f thirty (30 ) year s fro

mth e dat e o f th

e origina l restrictions , an d tha t theyrecord furthe r notice s o f the restriction s ever ytwenty(20 ) 

### year s thereafter . EPAo r MADE P wil l remai n i n contac t wit hthe Sit e owners , o r thei r successors , t o ensur e tha t the yperfor

mthe require d subsequent recording s o f thes e dee d restrictions . 

### Sinc e contaminatio n remain s a t the Site , Section 121(c ) o f SARA , requirin

g five-year reviews , doe s appl yan d wil l be complie d wit h a s describe d i n section V below .

V . SUMMAR YOF FIVE-YEA R REVIE W 8TATD 8 Consisten t wit h OSWE R Directiv e 9355.7-02 , a n acceptabl e and detaile d workpla n wil l b e develope d fo r th e performanc e o f five

yea r review s a t th e CE C Bridgewate r Site . Th e review s wil l b e o f sufficien t detai l t o determin e whethe r th e protectivenes s o f huma n healt h an

d the environmen t i s maintained . Activitie s whic h mayb e conducte d a s par t o f th e five-yea r review s includ e bu t ar e no t limite d to : 1 . Sit e document s review , 2 . revie wo f protectivenes s an d applicabl e o r relevan t an d appropriat e requirement s (ARARs) , 3 . a visua l inspectio n o f th e Site , 4 . an d Sit e interview s wit hoperatio n an d maintenanc e contractor s and MADE P personnel . Th e resul t o f eac h five-yea r reviewwil l b e a repor t whic h wil l issu e a statemen t o f protectivenes s o r issu e recommendation s and implementatio n requirement s t o assur e th e Sit e remain s protectiv e o f publi c healt hand th e environmen t base d o n th e curren t guidance . Th e repor t wil l als o includ e th e scop e an d natur e o f futur e five-yea r reviews . Five-yea r review s mus t b e performe d a t th e Sit e unti l level s ar e achieve d whic hwoul d allo wfo r unrestricte d exposure . Th e firs t five-yea r revie wfo r th e Sit e i s schedule d fo r the secon d quarte r o f fiscal-yea r 95 .

VI . PROTECTIVENES S Al l completio n and long-ter mrespons e actio n requirement s fo r thi s Sit e hav e bee n me t a s specifie d i n OSWE R Directive 9320.2

- 3A , a s update d b

yOSWE R Directiv e 9320.2-3B . Specifically , confirmatorysamplin g ha s verifie d tha t al l RO D soi l cleanu p objectives , including remova l o f PC B concentration s t o belo w9 

### ppmand remova l o f VO C and SVO C concentration s belo wth e remedia l1 2



### desig n excavation levels , hav e bee n achieve d an d al l cleanu

p action s specifie

d i n th e RO D have been implemented . Result s o f ai r monitoring , confirmator ysamplin

g an d the backfillin

g o f the Sit e with a clean-fil l materia l provide further assuranc e tha t 

### the Sit e i s protectiv e o f huma n healt han

d the environment . The necessar

ydee d restriction s ar e i n plac e an d the onlyongoing activitya t th

e Sit e i s th

e long-ter

mmonitorin

g o f groundwate r being conducted b

ythe PRP Grou

p wit h EP

Aan d MADE P oversigh t t o 

### assur e tha t groundwate r cleanu p targe t level s ar e achieved . Abibliograph

yo f al l report s relevan t t o the completion o f thi s Sit e unde r the Superfun d progra

mi s attached . Thes e document s 

### ar e availabl e fo r reviewb ycallin g the Region 1 offic e a t (617 ) 573-5729 .

Approve d By : 

### Regiona l Administrato r Dat eCompoun d VOC s SOI L REMEDIATIO N CRITERI A FO RVOC S andSVOC 3 

### Uplan d Are a Soil s Remedia l Desig

n Excavatio n Leve l (ppm )
Trichloroethen e 1. 1 dichloroethene Toluene Xylen e 

### Chlorobenzen e Tetrachloroethen e Benzen e Ethylbenzen e 1. 2 dichlorobenzen e 

### 1. 3 dichlorobenzen e 1. 4 dichlorobenzen e 1,1, 1 trichloroethan e 0. 5 0. 5 1. 0 1. 0 1. 0 0. 5 1 . 1 . 1 . 1 . 1. 0 Therma l Aeratio n

Treatmen t Leve l (ppm )

0 , 0 , 0 , 0 , 1 1 2 2 0. 1 0. 1

0. 5 8 VOC s 4-methyIpheno l 2-methyInapthalen e Dimethylphthalat e Di-n-butylphthalat e Pheno l N-nitrosodiphenylamin e Bis(2-ethyIhexyl)phthalat e

Naphthalen e Butylbenzylphthalat e 3 3 3 3 3 3 3 , 3 3 , 1, 1 dichloroethen e Trichloroethen e Benzene 

### Viny l chlorid e Tetrachloroethene We t Are a Soil s 0.1 6 0.1 2 0.1 2 0.0 5 0.1 2 3 3 3 3 3 3 3 0 0 0 0 0 0 0 3. 0 3. 0

0. 1 0. 1 0. 1 0.0 5 0. 1 Remedia l Desig

n Excavatio n Level s - concentration s abov e whic h soil s require d excavation . Therma l Aeratio n Treatmen t Level s - concentration s t o whic h excavate d soil s require d treatment . The "dash " (- ) indicate s compound s wit hgreate r volatility .REFERENCE S

Ebasc o Service s Inc. , "Remedia l Investigation - Cannon s 

### Engineering Site" , May , 1987 . Ebasc o Service s Inc. , "Endangermen t Assessmen t - Cannon s Engineering Site" , May , 1987 . Ebasc o Service s Inc. , "Wetland s Assessment - Cannon s 

### Engineerin

g Site" , April , 1987 . Ebasc o Service s Inc. , "Feasibilit yStud y- Cannon s Engineering Site" , January , 1988 . Unite d State s Environmenta l Protectio n Agency , 1988 , "Record 

### o f Decisio n - Cannon s Engineering Site" , Marc h31 , 1988 . Canoni e Environmenta l Service s Corp. , "Healt h an d Safety Plan , Qualit yAssuranc e Projec t Plan fo r Remedia l Actio n a t the Cannon s Engineering Site" , January , 1990 . Canoni e Environmenta l Service s Corp. , "Remedia l Design Repor t - Cannon s Engineering Site" , January , 1990 . Canoni e Environmenta l Service s Corp. , "Remedia l Actio n Wor k Plan - Cannon s Engineering Site" , January , 1990 . 

### Canoni e Environmenta l Service s Corp. , "Draf t Remedia l Actio n Repor t - Cannon s Engineering Site" , August , 1991 . Canoni e Environmenta l Service s Corp. , "Long-Ter mGroun d Wate r Monitoring Plan - Cannon s Bridgewate r Superfun d Site" , August , 1991 . Unite d State s Environmenta l Protection Agency , "Procedure s fo r Completio n an

d Deletio n o f Nationa l Prioritie s Lis t Site s - OSWE R Directive 9320.2-3A" , Apri l 1989 . Unite d State s Environmenta l Protectio n Agency , "Updat e t o th e Procedure s fo r Completio n an d Deletio n o f Nationa l Prioritie s Lis t Site s - OSWE R Directiv e 9320.2-3B" , Decembe r 29 , 1990 . Partia l Consen t Decree,•entere d b yth e Cour t i n th e Unite d State s v . Cannon' s Engineerin g Corporation , et . al» . 72 0 F . Supp . 102 7 (D . Mass . 1989) , aff'd . 89 9 F.2 d 7 9 (1s t Cir . 1990) .