### Superfun dRecord ? Cente r SITE : kk BREAK : OTHER : Clarificatio n o f

Decembe r30,199 9 Fiv e Yea rRevie w iSam c o f Site : Nor\\oo dPCB s Superfun dSit e

Norwood , M A Descriptio n o f

Site : Ih e Norwoo dPCB s Superfun dSit e (Site ) i s locate do n2 6 acie s o f mainl y commercia l an d industria l propertie s Th e Sit e i s bordere db y Rout e 1 , th e Dea nStiee t acces s road , Meado w Biook , Pellan aRoad , an dDea nStree t Th e Sit e consist s o f

severa l parcel s o f

land , includin g th e forme r Gran t Gea r faciht) . Kern ' Place , an dadjacen t area s includin g Meado w Broo k I n 1979 , th e Sit e wa s subdivide dTh e northeaster n portio n o f th e Site , approximatel y 9 acre s i nsize , wa s purchase db > Gran t

Gea r Realt } Trus t

an dlease dt o Gran t

Gea r Woiks , In c Th e souther nan d \\este mportion s o f

th e Sit e wer e furthe r

subdivided , amajo i portio n o f whic hwa s name dKen y Plac e Mos t

o f th e lot s no w ar e occupie db y commercia l an dligh t industria l building s Beginnin g i nth e 1940s , previou s owner s o r operator s o f

th e Gran t

Gea r buildin g use d poKchlonnate dbiphenyl s (PCBs ) i nth e productio n o f electrica l transformer s an dothe r electrica l component s Th e Sit e ha s bee n addresse dthroug hinitia l remova l action s an don e long-ter mremedia l actio n (RA ) divide dint o thre e phase s groundwate r (fund-lead) , buildin g demolitio n (PRP-lead) , an d soil/sedimen t

(PRP-lead ) Constructio n complet e wa s achieve do n Septembe r 23 , 1999 , however , R A complet e ha s ye t t o b e achieve dfo r

th e soil/sedimen t

phas e sinc e th e fina l R A actio n report

ha s no t bee n submitte do r

approve dR A complet e wa s achieve dfo r th e groundwate r

phas e o n Novembe r

16 , 200 0 an dfo r

th e buildin g demolitio n phas e o n Augus t 8 , 200 1 Th e nex t

Fiv e Yea r

Revie w i s schedule dt o b e complete db y Novembe r 22 , 200 4 Purpose : Th e purpos e o f

thi s documen t

i s t o clarif y th e protectivenes s statemen t provide di nth e Decembe r 30 , 199 9 Fiv e Year

Revie w fo r

th e Sit e i n respons e t o th e recen t Resource s to r

th e Futur e stud y Revise d Protectivenes s Statement : Th e remed y a t

th e Sit e i s expecte dt o b e protectiv e o f huma n healt han dth e environment , an d immediat e threat s hav e bee n addresse d A t th e tim e o f

th e Fiv e Yea r

Review , remedia l activitie s wer e ongoin g Th e groundwate r treatmen t plan t wa s i n operatio n an dfunctionin g properl y Nin e extractio n well s locate di nth e northeas t portio n o f

th e Sit e wer e successfull y removin g groundwate r an dsendin g i t

t o th e treatmen t plan t wher e variou s processe s (primaril y precipitatio n an dfiltration ) wer e removin g contaminant s poo r

t o dischargin g t o Meado w Broo k Groundwate r

cleanu p standard s (drinkin g wate r standard s o r

MCLs ) wer e consistentl y bein g me t Plan t operation s wer e suspende di n Jun e 200 0 becaus e th e Stat e submitte daGroundwate r Us e an dValu e Determinatio n indicatin g tha tgroundwate r i nth e vicinit y o f

th e Sit e wa s n o longe r

considere dapotentia l drinkin g wate r sourc e EP A als o complete daSupplementa l Ris k Assessment

t o evaluat e potentia l risk s assumin g th e shutdow no f th e groundwate r

treatmen t

plan t Ecologica l risk s wer e insignifican t an dhuma nhealt hrisk s wer e significan t onl y unde r

apotentia l futur e us e scenari o EP A i s currentl y negotiatin g \\it hpotentia l developer s an dwil l requir e appropriat e institutiona l and/o r engmecim g control s t o addres s huma nhealt hrisk s shoul dde\elopmen t occu r EPA . i s i nth e proces s o f

preparin g a nExplanatio no f Significan t

Difference s t o foimall } documen t th e suspensio no f

ground\ \dte r

treatmen t

Ongoin g ground s ate r

an dsi nfac e \\ate r

monitorin g activitie s documen t

tha t thi s phas e o f

th e overal l remed v icmain s protectiv e o f huma nhealt han d th e environmen t

Existin g institutiona l controls , whic hrestric t developmen t

an dgroundwate i extractio namongs t

othe r things , ar e adequatel y protectiv e Althoug hbuildin g demolitio nactivitie s wer e complete di n1997 , afe w remainin g administrativ e item s prevente dth e R A fro mbein g formall y complete dunti l Augus t 8 , 200 1 Similarl v althoug hsoil/sedimen t

constructio nactivitie s wer e essentiall y complete di n1998 , afe w outstandin g issue s remai nI nparticular , aportio no f th e protecti v e asphal t

ca p need s t o b e extende db y les s tha nafoo t i norde r t o provid e th e appropriat e thicknes s an dmateria l ove r PC B consolidate dsoil/sedimen t Ca p extensio n activitie s ar e expecte dt o b e complete di n200 1 Al l remainin g administrativ e activitie s fo r th e soil/sedimen t

phas e ar e schedule dt o b e complete di n 200 1 bu t wil l likel y b e complete di n200 2 afte r whic hrevise dinstitutiona l control s w il l b e pu t i n plac e Give n th e ongoin g activitie s mentione dabove , th e remed y a t th e Sit e i s expecte dt o b e protectiv e o f huma nhealt han dth e environment , an dimmediat e threat s hav e bee n addresse d

Sharo n M Hayes , RP M Offic e o f Sit e Remediatio n^Restoratio n Dat e

# U.S . EP A - NE WENGLAN D

OFFIC E O FSIT E REMEDIATIO N AN D

RESTORATIO N FIVE-YEA RREVIE W NORWOO D PCB S SUPERFUN D SIT E NORWOOD , MASSACHUSETT S DECEMBE R199 9TABL E O F CONTENT S

SECTIO N PAG E I . Introductio n1 a. Authority Statement

1 b. Background

1 II . Discussio n o f

Remedia l Objective s 2 a. Phase 1 - Groundwater Treatment

2 b. Phase 2 - Building Demolition 4 c. Phase 3a - Cap/Cover 5 d. Phase 3b - Meadow Brook Restoration 6 e. Preliminary Close Out Report 1 f. Explanation of

Significant

Differences 7 g. Institutional

Controls/Restrictions 1 III . Recommendation s 8 IV . Statemen t

o f Protectivencs s 9 V . Nex t

Five-Yea r

Revie w 9FIVE-YEA RREVIE W NORWOO D PCB s SUPERFUN D SIT E NORWOOD , MASSACHUSETT S I . Introductio n a. Authority Statement U.S . EP A - Ne w Englan dconducte dthi s statutory ' Five-Yea r Revie\ \pursuan t

t o CERCE A sectio n 121(c) . NC Psectio n 300.400(f)(4)(ii) , an dOSWE RDirective s 9355.7-0 2 (Ma y 23 . 1991) . 9355.7-02 A (Jul y 26 , 1994) . an d9355.7-03 A (Decembe r 21 , 1995) . Thi s i s th e firs t Five

Yea r Revie w conducte da t

thi s Site . Th e purpos e o f aFive-Yea r

Revie w i s t o ensur e tha t a remedia l actio n remain s protectiv e o f publi c healt han dth e environmen t an di s functionin g a s designed . Thi s documen t wil l becom e part

o f th e Sit e file . Thi s revie w (Typ e la ) i s applicabl e t o aSit e wher e remedia l actio n i s ongoing . b. Background Th e Norwoo dPCB s Superfun dSit e (Site ) i s locate do n 2 6 acre s o f mainl y commercia l an d industria l properties . Th e Sit e i s bordere db y Rout e 1 , th e Dea n Stree t acces s road , Meado w Brook , Pellan aRoad , an dDea n Street . Th e Sit e consist s o f severa l parcel s o f

land , includin g th e forme r Gran t Gea r facility ; Kerr y Place ; an dadjacen t area s includin g Meado w Brook . I n 1979 . th e Sit e wa s subdivided . Th e northeaster n portio n o f th e Site , approximatel y 9 acre s i n size , wa s purchase db y Gran t

Gea r Realt y Trus t

an dlease dt o Gran t

Gea r Works , Inc . Th e souther n an d wester n portion s o f

th e Sit e wer e furthe r

subdivided , amajo r

portio n o f

whic hwa s name dKerr y Place . Mos t

o f th e lot s no w ar e occupie db y commercia l an dligh t industria l buildings . Beginnin g i n th e 1940s , previou s owner s o r operator s o f

th e Gran t

Gear buildin g use d polychlorinate dbiphenyl s (PCBs ) i n th e productio n o f electrica l transformer s an dothe r electrica l components . Groundwate r

i s contaminate dwit hPCBs , volatil e organi c compound s (VOCs ) suc ha s trichloroethylen e (u p t o 1,70 0 ppb ) an dviny l chloride , an dsemivolatil e organi c compound s (SVOCs) . Soi l an dsediment s ar e contaminate dwithPCB s (u p t o 26,00 0 ppm) , polycycli c aromati c hydrocarbon s (PAHs ) an dheavy metals . Th e Sit e ha s bee n addresse dthroug hinitia l remova l action s an don e long-ter mremedia l actio n focusin g o n th e cleanu p o f th e entir e Site . I n 1983 , afte r MADE Pdetecte dhig hlevel s o f PCB s i nth e soi l o n th e Site , EP A conducte da n emergenc y remova l o f ove r 50 0 ton s o f

highl y contaminate dsoi l an dtransporte di t t o a n approve ddisposa l facility . I n 1986 , MADE Pinstalle d a4-foo t hig hwir e mes hfenc e aroun da1.5-acr e portio n o f th e Sit e an dconstructe daprotectiv e line r mad e o f grave l an dfabri c behin dth e Gran t Gear buildin g t o limi t

acces s t o area s wit hth e highes t concentratio n o f

PCB s i n surfac e soils . EP A als o finalize dth e Sit e o n th e Nationa l Prioritie s Lis t

i n 1986 , makin g th e Sit e eligibl e fo r Superfun dcleanu p funds . EP A conducte dth eRemedia l Investigatio n an dFeasibilit y Stud y an dselecte dth e remed y i na198 9 Recor do f

Decisio n (ROD) . Th e 198 9 RO D include dexcavatin g an dtreatin g soils/sediment s b y solven t extraction ; decontaminatin g th e Gran t Gea r building ; an dpumpin g an dtreatin g contaminate d groundwater . Th e facilit y t o trea t contaminate dgroundwate r bega n operatin g i n1996 . I nMa y 1996 , EP A publishe da namendmen t t o th e selecte dremed y du e t o highe r tha n anticipate d solven t extractio n cos t

estimate s an dothe r

technica l difficulties , an dals o t o promot e th e reus e o f th e Sit e fo r

commercia l o r

industria l use . Th e amende dremed y include ddemolishin g th e Gran t Gear buildin g an dexcavatin g an dconsolidatin g contaminate dsoils/sediment s unde r asphal t ca p an dcove r areas . EP A als o agree dt o complet e th e Tow n o f Norwood' s floo dcontro l projec t withi nth e are ao f

th e Sit e b y restorin g an dstabilizin g th e sid e slope s an dbotto mo f Meado w Broo k afte r contaminate dsediment s wer e removed . Groundwate r

treatmen t

an dMeado w Broo k

restoratio n activitie s wer e Fund-lea dwhil e buildin g demolitio nan dcap/cove r activitie s wer e complete db y contractor s fo r th e Settlin g Defendants . EP A utilize dth e U.S . Arm y Corp s o f Engineer s (USAGE ) a s it s constructio n an doversigh t manage r fo r al l remedia l actio n activities . II . Discussio n o f

Remedia l Objective s EP A issue don e RO D an don e amende dRO D fo r Operabl e Uni t

# 1 a t th e Site . Thre e separat e cleanu p phase s wer e complete d—on e b y EP A (Phas e 1 ) an dtw o b y th e Settlin g Defendant s (Phase s 2 an d3) . EP A als o complete dMeado w Broo k restoratio n activitie s a s par t o f Phas e 3 . Cleanu p an drestoratio n phase s ar e describe dbelow : a. Phase 1 - GroundwaterTreatment I n accordanc e wit hth e 198 9 ROD , EP A (unde r th e constructio n managemen t o f USAGE ) complete dth e constructio n o f a6,00 0 squar e foo t

groundwate r

treatmen t

plan t a t th e northeaster n edg e o f th e Sit e i n Novembe r

1995 . EP A an dMADE Pperforme dapre-fma l inspectio n o f th e plan t o n Januar y 11 , 199 6 afte r whic hth e treatmen t

plan t bega n operating . Durin g constructio n o f

th e groundwate r

treatmen t

plan t foundation , PC B contaminate dsoi l wa s excavated , relocated , an dstockpile donsite . PC B contaminate dsoi l fro mfou r outlyin g area s wer e als o excavated , relocated , an dstockpile donsite . Thes e soil s (approximatel y 2,00 0 cubi c yards ) wer e subsequentl y consolidate donsit e unde r cap/cove r

area s durin g Phas e 3 aactivities . A serie s o f

nin e extractio n well s locate di n th e northeas t portio n o f

th e Sit e collec t

contaminate d groundwater . Onc e collected , th e wate r i s pumpe dint o th e plan t an dinorgani c contaminant s ar e remove di n aprecipitatio n proces s wher e metals , i n th e for mo f particulates , settl e ou t

o f th e water . Afte r

dissolve dmetal s ar e remove dvi aprecipitation , th e remainin g undissolve dsolid s ar e remove dvi afiltration . Th e metalli c sludg e i s the n presse dan dth e resultin g filte r cak e i s trucke dt o a n offsit e disposa l facility . A s o f Augus t 1999 , 25,08 0 pound s o f

filte r cake hav e bee n dispose do f

a t th e Turnke y Landfil l i n Rochester , Ne w Hampshire . Organi c contaminants .includin g PCBs , ar e remove di n a n ai r stripper/carbo n adsorptio n system . Durin g thi s proces s VOC s ar e transferre dfro mth e wate r t o th e ai r stream . A catalyti c oxidatio n uni t (CatOx ) the n destroy s th e VOC s i n th e ai r streambefor e bein g discharge dt o th e atmosphere . Wate r exitin g th e ai r strippe r i s the n force dthroug htank s containin g activate dcarbo n whic hadsor b remainin g organi c contaminant s an dserve s a s alas t polishin g ste p befor e th e treate dwate r i s teste dan d discharge dt o Meado w Brook . Du e t o hig hoperatin g cost s th e CatO x uni t wa s take nofflin e i n199 7 afte r supplementa l test s an dai r dispersio n modelin g showe dtha t untreate demission s wer e alread y wel l belo w regulator y limit s prio r

t o enterin g th e CatOx . A s afurthe r cos t saving s effor t

th e ai r strippe r blowe r wa s shu t of f afte r th e cascadin g effec t

o f th e wate r passin g throug hth e strippe r wa s show n t o b e sufficient . Althoug hth e plan t

wa s originall y designe dt o trea t groundwate r

a t a naverag e flo w rat e o f

3 0 gallon s pe r

minut e (gpm ) an da t

amaximu mflo w rat e o f 6 0 gpm , th e actua l averag e flo w rat e i s les s tha n 1 0 gpm . I na neffor t t o increas e th e averag e flo w rat e an dhenc e th e mas s o f contaminant s removed , si x o f th e nin e extractio n well s wer e redevelope di n Jun e 1998 . Thi s effor t increase dth e averag e flo w rat e i nthes e si x well s b y 70% . I nSeptembe r

1998 , du e t o biologica l foulin g o f th e carbo n unit s whic hresulte di n exces s backpressure , th e ai r

strippe r effluen t wa s allowe dt o bypas s th e carbo n vessel s thu s restorin g th e hydrauli c function s o f

th e plant . Historica l dat ashowe dtha t th e plan t effluen t woul dstil l mee t th e discharg e criteri aunde r thi s scenario . Plan t effluen t concentration s hav e me t al l discharg e criteri aexcep t fo r mino r exceedance s o f

th e manganes e discharg e limi t (10 0 ppb ) i n Octobe r

199 8 (13 4 ppb ) an dApri l 199 9 (58 2 ppb) . Mino r modification s wer e conducte dafte r th e Octobe r

199 8 exceedanc e an dresulte di n level s belo w th e discharg e limi t i n Januar y 1999 . Afte r

th e Apri l 199 9 exceedance , th e effluen t wa s resample dan dwa s wel l belo w th e discharg e limi t (2. 6 ppb) . Th e installatio n o f th e cap ove r

th e Sit e (Jun e 1998 ) a s wel l a s th e bypassin g o f th e carbo n vessel s (Septembe r 1998 ) ar e bein g investigate da s possibl e reason s fo r thi s problem . I n orde r

t o furthe r

evaluat e thi s issu e an dmak e th e necessary adjustments , samplin g fo r manganes e remova l i s bein g conducte do n amor e frequen t basis . A s o f Augus t 1999 , approximatel y 13. 5 millio n gallon s o f groundwate r

hav e bee n treate dan d abou t 10 5 kilogram s o f

chlorinate dVOC s hav e bee n remove dfro mth e groundwate r beneat hth e Site . Th e treatmen t

plan t wa s constructe dfo r

acos t o f approximatel y $1 1 millio n an di s currentl y operate dan dmaintaine dfo r acos t o f approximatel y $500,00 0 pe r year . Monitorin g an dextractio n well s ar e sample dquarterl y an dhav e bee n sample do n 1 4 occasion s sinc e startup . I naccordanc e wit hth e Superfun dStat e Contrac t betwee n EP A an dMADE Pan dpursuan t t o Sectio n 104(c)(3 ) o f

CERCLA , th e Stat e ha s an dcontinue s t o contribut e 10 % o f th e cost s associate dwit hth e constructio n an drestoratio n phase s o f groundwate r

remediatio n a t

th e Site .Th e State' s obligatio n t o assur e operatio n an dmaintenanc e (O&M ) o f th e groundwate r

collectio n an dtreatmen t

syste man dmonitorin g wel l networ k wil l begi n upo n completio n o f th e restoratio n phase , whic hi s whe n th e cleanu p goal s i n th e RO D ar e achieve do r te n year s hav e elapsed , whicheve r

i s earlier . Th e findin g tha t th e groundwate r

cleanu p goal s establishe di nth e RO D hav e bee n achieve dwil l b e base dupo n thre e year s o f groundwate r

monitorin g t o verif

y tha t cleanup-goal s hav e indee dbee n met . I nth e even t tha t groundwate r

cleanu p goal s ar e achieve d durin g th e restoratio n phase , th e Stat e wil l hav e n o obligatio nt o assur e O& M o f th e groundwate r collectio nan dtreatmen t

syste man dmonitorin g wel l network . Groundwate r

cleanu p standard s wer e originall y base do n drinkin g wate r criteria . However , sinc e th e plan t wa s constructed , th e aquife r ha s bee n re-classifie db y th e Stat e an di t i s n o longe r

a curren t o r potentia l futur e drinkin g wate r supply . A s aresult , EP A i s currentl y i nth e proces s o f completin g asite-specifi c ris k assessmen t

i n orde r t o revis e groundwate r

cleanu p standards . Th e ris k assessmen t

wil l addres s th e followin g potentia l exposur e pathways : 1 ) exposur e o f huma n receptor s t o VOC s volatilizin g fro mgroundwate r an dth e vados e zon e int o th e indoo r ai r o f a potentia l buildin g o n th e Site , an d2 ) exposur e o f environmenta l receptor s t o groundwate r contaminatio n whic hma y discharg e t o Meado w Brook . Th e revise dcleanu p standard s wil l b e consisten t

wit hth e State' s curren t

groundwate r

classificatio n an dwil l addres s th e potentia l futur e commercial/industria l reus e o f th e property . b. Phase 2 - Building Demolition I n accordanc e wit hth e 199 6 amende dRO D an daConsen t Decre e betwee n EP A an dth e Settlin g Defendants , th e 90,000 squar e foot , slab-on-grad e Gran t Gea r buildin g wa s demolishe d(rathe r tha n bein g decontaminate dpe r th e 198 9 ROD) . Th e one-stor y buildin g wa s originall y constructe di n 194 2 an dcontaine dasubgrad e boile r roo man dtw o smal l secon dfloo r mezzanin e areas . Th e buildin g consiste dmainl y o f alarg e ope n productio n are awit hsevera l smalle r area s sectioned-of

f fo r us e a s offic e an dstorag e space . Demolitio n activitie s too k plac e betwee n Octobe r 199 6 an dFebruar y 199 7 an dwa s performe db y GZ A GeoEnvironmental , Inc . fo r th e Settlin g Defendants . USAG Eprovide donsit e constructio n oversight . EP A an dMADE P performe dafina l inspectio n o n Februar y 6 , 1997 . Th e followin g activitie s wer e complete ddurin g th e buildin g demolitio n phase :

• inventory , consolidation , an doffsit e disposa l o f wast e remainin g fro mth e forme r facilit y operations ; • abatemen t

an doffsit e disposa l o f

asbestos-containin g material s fro mth e building ; closur e o f buildin g drainag e syste mincludin g remova l an ddisposa l o f fre e liquid s an d sedimen t fro monsit e manhole s an dgroutin g o f buildin g drai n lines ; remova l an doffsit e disposal/recyclin g o f exterio r stee l siding ; • remova l an dshreddin g o f contaminate dwoode n roo f deckin g (dispose donsit e unde r cap/cove r area s durin g phas e 3) ;remova l an dcrushin g o f brick , concrete , an dwallboar d(dispose donsit e unde r cap/cove r area s durin g phas e 3) ; disposa l o f

remainin g facilit y equipmen t an dcertai n buildin g materials/debri s i nth e subgrad e boile r

room , fillin g th e remainin g voi dspace s wit h"flowabl e fill" , an d constructin g a14-inc hthic k structura l sla b ove r

th e boile r

roo marea ; remova l an doffsit e recycling/disposa l o f tw o 275-gallo n an don e 750-gallo n empt y abovegroun dcondensatio n collectio n tanks ; an d remova l an ddisposa l i nth e boile r roo mo f a1,000-gallo nempt y undergroun dtan k (10 0 gallon s o f wast e oi l dispose doffsite) . O nJanuar y 20 . 1999 , EP A grante dconditiona l approva l o f th e buildin g demolitio nRemedia l Constructio nRepor t

(RCR) . Fina l approva l wil l b e grante dupo n receivin g th e followin g informatio nwhic hwil l b e provide di n th e cap/cove r RCR : surve y informatio n fo r

th e boile r

roo mvault ; an d documentatio no f

th e cleaning/scalin g o f

sla b penetrations . c. Phase 3a - Cap/Cover I naccordanc e wit hth e 199 6 amende dRO D an daConsen t Decre e betwee n EP A an dth e Settlin g Defendants , PC B contaminate dsoi l an dsedimen t wer e consolidate donsit e unde r ca p an dcove r area s (rathe r

tha n bein g treate dvi asolven t extractio n pe r

th e 198 9 ROD) . Cap/cove r activitie s too k plac e betwee n Apri l 199 7 an dAugus t 199 8 an dwer e performe db y GZ A GeoEnvironmental , Inc . fo r th e Settlin g Defendants . USAG Eprovide donsit e constructio n oversight . EP A an dMADE Pperforme dafina l inspectio n o n Augus t 11 , 1998 . Th e followin g activitie s wer e complete ddurin g th e cap/cove r phase :

• consolidat e approximatel y 2,00 0 cubi c yard s o f PC B contaminate dsoi l stockpile donsit e b y EP A fro mgroundwate r treatmen t

plan t constructio n an doutlyin g area s excavate d durin g Phas e 1 ; consolidat e approximatel y 1,60 0 cubi c yard s o f PC B contaminate dsoi l stockpile do n th e adjacen t Reardo n property ; excavat e PC B contaminate dsedimen t i n Reac h1 . 2 , an d3 o f

Meado w Broo k

(t o th e excavatio n grade s establishe di n USAGE' S restoratio n plans ) an dconsolidat e onsite ; • remova l o f

additiona l staine dsedimen t i n Reac h1 an dconsolidat e onsite ; excavat e o n an doffsit e PC B contaminate dsoil s an dconsolidat e onsite ; remova l o f

"ho t spot " soil s belo w wate r

tabl e an drelocat e onsite ; remova l an ddisposa l o f

on e 10,000-gallo n an don e 20,000-gallo n undergroun dfue l oi l tanks ; • instal l stor mwate r runoff control/sit e drainage ; an d • instal l asphal t

cap (approximatel y 4. 5 acres ) an dgrave l cover s (approximatel y 1. 6 acres) .Cap/cove r remediatio n activitie s wer e conducte di n coordinatio n wit hcertai n propose d redevelopmen t

activities . Redevelopmen t plan s hav e no t

bee n finalized . Th e followin g redevelopmen t

activitie s wer e als o complete ddurin g thi s phase :

• construc t

stor mwate r

detentio n basi n (fo r

bot hremedia l an dredevelopmen t purposes) ; instal l subsurfac e drainag e structures ; construc t tw o retainin g walls ; an d instal l electrica l condui t

an dligh t pol e bases . EP A i s currentl y reviewin g th e draft cap/cove r

RCR . I n accordanc e wit hth e Consen t Decree , th e Settlin g Defendant s wil l b e responsibl e for : 1 ) performin g al l O& M activitie s i norde r t o maintai n th e integrit y an deffectivenes s o f ca p an dcove r

areas , an d2 ) conductin g appropriat e monitorin g activitie s t o asses s th e protectivenes s an dperformanc e o f th e cleanu p phase s performe db y th e Settlin g Defendants . Suc hactivitie s wil l b e documente di nO& M an d environmenta l monitorin g wor k plan s whic hhav e ye t

t o b e finalized . O& M an denvironmenta l monitorin g activitie s wil l initiat e withi n3 0 day s o f EPA' s approva l o f

th e cap/cove r

RCR . Th e estimate dcos t

b y th e Settlin g Defendant s fo r completin g phase s 2 an d3 ai s $6. 6 million . d. Phase 3b - Meadow Brook Restoration I naccordanc e wit hth e 199 6 amende dROD , an dafte r th e Settlin g Defendant s ha dexcavate d contaminate dbroo k

sediments , EP A (unde r

th e constructio n managemen t o f USAGE ) restore d an dstabilize dth e sid e slope s an dbotto mo f Meado w Broo k

i n orde r t o complet e th e Tow n o f Norwood' s floo dcontro l projec t withi n th e are ao f

th e Site . Althoug hth e cleanu p leve l fo r PCB s i nbroo k sediment s i s 1 ppm , th e broo k wa s onl y excavate dt o th e depth s require dt o mee t th e contour s o f

th e floo dcontro l project . Th e sid e slope s an dbotto mo f th e broo k were the n restore d wit halaye r

o f geotextil e fabri c an dappropriat e restoratio n material s (i.e. , ri p rap , interlockin g concret e blocks , o r

precas t concret e culver t

sections ) whic hcovere dan y remainin g contaminatio n locate da t

depth s belo w th e floo dcontro l contours . Restoratio n activitie s i n Reac h 1 o f Meado w Broo k

(adjacen t t o th e Site ) too k

plac e betwee n Octobe r

199 7 an dDecembe r

1997 . Du e t o concern s relate dt o th e us e o f th e interlockin g concret e block s o n th e steepe r slope s withi n Reac h2 , adecisio n wa s mad e t o utiliz e precas t concret e culver t

sections . Thi s redesig n effort , a s wel l a s hig hwate r

conditions , resulte di n delay s i n completin g restoratio n activitie s i n Reac h2/3 . Reac h2/ 3 activitie s too k

plac e betwee n Apri l 199 9 an dJul y 1999 . EP A an dMADE Pperforme d afina l inspectio n o nAugus t 11 , 1999 . Th e followin g activitie s wer e complete ddurin g th e broo k restoratio n phase : prepar e broo k

sid e slope s an dbotto m(excavat e o r backfill ) consisten t

wit hfloo dcontro l contour s an drestoratio n materials ; instal l ri p ra p (upstrea mportion ) an dinterlockin g concret e block s (downstrea mportion ) o n to p o f geotextil e i n Reac h1 ;instal l precas t concret e culver t

section s i nupstrea mportio n o f Reac h2 ; instal l ri p ra p o n to p o f

geotextil e i n downstrea mportio n o f Reac h2 ; • instal l ri p ra p 10 0 fee t int o Dea n Stree t

culver t (Reac h3) ; instal l topsoi l an dsee dt o to p o f slop e an di nvoid s o f

interlockin g concret e blocks ; encas e tw o sewe r

sypho n line s acros s brook ; suppor t 3 0 inc hsewe r

mai n adjacen t

t o brook ; an d • restor e wor k

area s (replac e fencing , hydroseed , plantings) . Meado w Broo k

restoratio n activitie s wer e conducte dfo r acos t o f approximatel y $775.000 . Fina l surve y plan s an dO& M instruction s ar e bein g complete dan dwil l b e provide dt o th e Tow no f Norwood . e. Preliminary Close Out Report Th e Preliminar y Clos e Ou t Repor t (PCOR ) fo r

thi s Sit e wa s finalize di nSeptembe r 1999 . Th e Fina l Clos e Ou t

Repor t (FCOR ) wil l b e complete dwhe n th e revise dgroundwate r cleanu p standard s hav e bee n met . / Explanation of

Significant

Differences Upo n establishin g ne w groundwate r cleanu p standard s base do n th e ongoin g site-specifi c ris k assessment, EP A wil l prepar e a n Explanatio n o f Significan t

Difference s (ESD ) t o documen t th e followin g change s fro mth e ROD/amende dROD/Consen t Decree :

• revise dgroundwate r cleanu p standard s (Phas e 1) ; remova l o f

additiona l PC B contaminate dsedimen t i nReac h1 o f

Meado w Broo k

an d onsit e disposa l unde r

cap (Phas e 3 a- $34,35 0 fro mSettlin g Defendants ' Norwoo dPC B Superfun dSit e Trus t

Fund) ; remova l an doffsit e disposa l o f tw o undergroun dfue l oi l tank s (Phas e 3 a- S77.50 0 fro m Settlin g Defendants ' Norwoo dPC B Superfun dSit e Trus t Fund) ; remova l an doffsit e disposa l o f undergroun dstorag e tan k contaminate dsoi l (Phas e 3 a- $40,281.6 5 fro mSettlin g Defendants ' Norwoo dPC B Superfun dSit e Trus t Fund) ; an d remova l o f

22 0 cubi c yard s o f

PC B contaminate dsoi l durin g detentio n ber m reconstructio n activitie s an donsit e disposa l unde r cap (Phas e 3 a- $28.25 0 fro mSettlin g Defendants " Norwoo dPC B Superfun dSit e Trus t Fund) . I t i s expecte dtha t

th e ESD , wit hpubli c comment , wil l b e prepare di n200 0 afte r th e groundwate r ris k assessmen t

i s completed . g. Institutional

Controls/Restrictions I naccordanc e wit hth e ROD , institutiona l control s (hereafte r referre dt o a s "restrictions" ) wer e establishe dfo r

th e Sit e i n orde r

t o ensur e th e remed y remain s protectiv e o f huma n healt han dth eenvironmen t unde r variou s us e scenarios . Th e origina l restriction s wer e par t o f th e Consen t Decre e entere dint o b y th e Unite dState s (plaintiff ) an dGran t Gear Works , Inc . an dJoh n an d Rober t Hurle y (defendants ) an dwa s file di ncour t i nDecembe r

1991 . Unde r

thi s Consen t Decree , th e followin g use s wer e restricte d(excep t i f require da s par t

o f additiona l remedia l effort s o r pursuan t t o apla n approve db y EPA) : residentia l use ; • withdrawa l o f

groundwater ; • disturbanc e o f

contaminated , untreate dsoils ; disturbanc e o f

soil s (o r othe r groun dcoverin g features ) tha t cove r disposa l areas ; disturbanc e o f

th e Gran t

Gea r buildin g floo r

surface s an dsubsurfaces ; disturbanc e o f

th e Gran t Gear drainag e system ; an d disturbanc e o f

an y o f th e remedia l measure s implemente da t th e Site . Thes e restriction s hav e bee n revise di n respons e t o th e amende dRO D an dth e 199 8 Agreemen t an dCovenan t

No t t o Su e entere dint o b y U.S . EP A - Ne w Englan dan dJosep hLaham/921 , Inc . (hereafte r referre dt o a s th e "Laha mProspectiv e Purchase r Agreement " o r

"Laha mPPA") . Th e revise drestriction s ar e outline di nExhibi t 7 o f th e Laha mPPA . Th e followin g use s ar e currentl y restricte d(excep t

i f require da s par t

o f additiona l remedia l effort s o r pursuan t t o apla n approve d b y EPA . afte r

areasonabl e opportunit y fo r revie w an dcommen t

b y MADEP) : agricultural , residential , o r infant/childcar e facilit y purposes , includin g an y activitie s an d use s relate dt o educationa l an drecreationa l activities ; • withdrawa l o f

groundwater ; an y us e o r

activit y whic hinterfere s wit hth e implementation , operation , o r maintenanc e o f respons e actions ; • an y actio n o r

inactio n tha t

result s i n disruptio n o f

cap(s) , cover(s) , o r

othe r groun d coverin g feature s o f

respons e action s o r

an y actio n whic hcompromise s th e protectiveness , integrity , o r effectivenes s o f

respons e actions ; an d an y excavation , handling , o r disposa l o f

an y loam , peat , gravel , sand , rock , o r othe r minera l o r

natura l resource . Thes e restriction s wil l ensur e tha t th e remed y i s protectiv e o f huma n healt han dth e environmen t unde r th e curren t

Sit e conditions . Thes e restriction s ma y b e furthe r revise di n accordanc e wit h futur e redevelopmen t

plans . III . Recommendation s I t i s recommende dtha t

th e site-specifi c ris k

assessmen t

b e complete dan dtha t

th e groundwate r cleanu p standard s b e revise ds o the y ar e consisten t wit hth e State' s curren t

groundwate r classification . Upo n meetin g th e revise dcleanu p standards , groundwate r treatmen t

shoul dstop , bu t monitorin g shoul dcontinu e t o verify tha t cleanu p standard s hav e indee dbee n met . I n th emeantime , i t i s recommende dtha t

groundwate r

continu e t o b e treate di n accordanc e wit hth e curren t cleanu p standards . IV . Statemen to f

Protectivenes s Icertif y tha t

th e remedie s selecte dfo r thi s Sit e remai n protectiv e o f huma n healt han dth e environment . V . Nex tFivc-Yca rRevie w Ha/ardou s substance s wil l remai n a t th e Sit e abov e health-base dlevel s afte r th e completio n o f

al l remedia l actions . Pursuan t t o CERCL A sectio n 121(c) , NC T sectio n 300.400(tX4)(ii) . an d OSWE RDirective s 9355.7-0 2 (Ma y 23 , 1991) , 9355.7-02 A (Jul y 26 , 1994) , an d9355.7-03 A (Decembe r

21 , 1995) , EP A mus t

continu e t o conduc t

statutor y Five-Yea r

Review s a t

th e Site . Th e nex t Five-Yea r

Revie w i s schedule dt o b e complete db y November3. ^ 2004 . whic hi s te n year s afte r

th e initiatio no f

constructio n o f

th e groundwate r

treatmen t

plant . Thi s re \ie w wil l evaluat e th e performanc e o f al l remedia l activitie s a t th e Site .

Patrici aL . Meaney , Directo r Offic e o f Sit e Remediatio n & Restoratio n Dat e