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# SITE;.^,ClXOfW r U.S . ENVIRONMENTA L PROTECTIO N AGENC Y 

### *>2S)2 S J 

### REGIO N I JF K FEDERA L BUILDING , BOSTON , MASSACHUSETT S 0220 3 

# N MEMORANDU M 

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### Date : Subject : Septembe r 29 , 199 8 F . O'Conno r

Superfun dSite , Augusta , Main e Remedia l Actio n Report SDM S DocI D 52512 5



### From : ) 

# IP — Through : To : ) 

### Lesli e McVicka r

Projec t Manage r v Mar y Jan e O'DonnelUChie f v 

### ME/VT/C T Superfun dSectio n Do n Berger , Chie f Remediatio n & Restoratio n I I Attache dheret o i s th e Remedia l Actio n (RA ) Report for th e secon doperabl e uni t a t th e O'Conno r Superfun dsit e i n August aMaine . Th e R A Report document s th e completio n o f th e Remedia l Actio n for

th e secon doperabl e uni t for th e Sit e an dcertifie s tha t constructio n i s complet e an dtha t

th e remed y i s operationa l an dfunctional . Th e RA Report wa s prepare db y consultant s hire db y th e performin g Settlin g Defendant . Consisten t with EP A guidance , thi s repor t als o serve s a s an informativ e documen t outlinin g experience s gaine dthroughou t th e . remedial action . Th e remedia l actio n for th e secon doperabl e uni t require dexcavatio n o f contaminate dsoils , off-site disposal , backfillin g wit h nativ e soils , restoratio n o f on-sit e wetlands an destablishmen t

o f compensator y wetlands . Th e onl y Operatio n an dMaintenanc e necessar y fo r thi s operabl e uni t

i s short-ter mmonitorin g th e wetland s t o ensur e tha t i s ha s properl y bee n established . Attache di s th e executiv e summary o f th e activitie s tha t

occurred . A fina l inspectio n o f

th e sit e fo r

thi s operabl e uni t

was conducte db y EP A an dth e Main e DE P o n Novembe r

12 , 1997 , durin g whic h i s was conclude dtha t th e sourc e contro l actio n ha dbee n implemente di n accordanc e wit h th e 100 % Remedia l Design . A summary o f projecte dcost s for OU 2 activitie s conducte dbetwee n Jul y 199 6 an dDecembe r 199 7 totale d$6,872,000 . 

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Do n Berger , Chie i Remediatio n & Restoratio n I I Branc h Dat e 

# A

# 7 . FINA L V..

SOURC E CONTRO L REMEDIA L ACTIO N

REPOR T

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# VO ' CONNO RCOMPAN Y SUPERFUN D SIT E 3 v ' • AUGUSTA , MAINE;'::' :

SEPTEMBE R199 8

^ WOODAR D &CURRA N tt^L . Engineerin g • Scienc e • Operation s

Prepare d b y WOODAR D & CURRA N IN C 4 1 Hutchin s Driv e Portland , Main e 0410 1 (207-774-2112 )

### . J J • J EXECUTIV E SUMMAR Y \ Th e Source-Contro l Remedial Actio n (SCRA ) at th e O'Conno r

Compan y Superfun dSit e (Site ) wa s complete do n Novembe r

11 , 1997 . Th e remediatio n o f th e Sourc e Contro l Operabl e Uni t (OU-1 ) wa s complete di n accordanc e with th e Consen t Decre e (USEPA , 1991) , Recor do f Decisio n (ROD ) (USEPA , 1989) , Explanatio n of

Significan t

Difference s (USEPA , 1994a) , Revise dStatemen t of Work (USEPA , 1994b) , an dth e Sourc e Contro l (SC ) 10 0 Percen t Remedia l Desig n (CMP , 1996) . Soil s an dsediment s were remediate dt o mee

t th e targe t

cleanu p goal s establishe di n thes e documents . B y meetin g th e require d targe t cleanu p goal s fo

r sit e soil s an dsedimen t

an dremovin g sit e surfac e waters , th e SCR A ha s achieve d th e remedial actio n objective s establishe dfor th e Sourc e Contro l componen t o f th e Selecte dRemedy i n th e ROD . Th e complete dSCR A has :

v I • reduce dth e potentia l presen t an dfutur e publi c healt h an denvironmenta l risk s fro mdirec t contact , ' ingestion , an dor

derma l absorptio n wit h th e polychlorinate dbiphenyl

- (PCB) , carcinogeni c polyaromati c hydrocarbon

- (cPAH) , an dlead-contaminate dsoil s an dsediment s on-site ; reduce dth e potentia l presen t an dfutur e publi c healt

h risk s fro mth e inhalatio n of PC B vapor s fro mth e Site ; an d reduce dth e potentia l presen t an dfutur e environmental risk s t o aquati c an dterrestria l wildlif e fro m exposure s t o th e PCB

- an dlead-contaminate don-sit e surfac e water . Phas e I o f th e SCR A wa s conducte di n 1996 . Durin g Phas e I , Stag e 1 soil s wer e remediated , th e bar n wa s decontaminated , demolishe dan ddispose do f off-site , an dnon-nativ e debri s wa s collecte dan ddispose do f off-site an dth e Suppor t

Are awa s constructe dfo r Phas e I I activities . Phas e I I activities, complete di n 1997 , include dcollectio n an ddisposa l o f on-sit e surfac e waters , remediatio n o f soil s an dsediment s i n Stag e 2 throug h Stag e 6 , reconstructio n o f th e Upper

Lagoon , Lowe r

Lagoo n an dth e Uplan dMarsh , an d fina l restoratio n o f

th e Site . Al l soil s an dsediment s withi n OU- 1 containin g greate r tha n 1 0 pp mPCBs , 1 0 pp mcPAHs , 24 8 pp mtota l lea dwere excavated , an ddispose do f a t approve doff-site disposa l facilities . A tota l o f 19,35 7 ton s o f

soi l an dsediment s wer e excavate dan ddispose dof off-site a s Specia l Wastes , Toxi c Substanc e Contro l Ac t
WOODAR D & CURRA N (97137.05 ) EXECUTIV E SUMMAR Y -Pag e i 9/2/9 8 LT/KT/ms/CM P SCRA/SCRARPT.DO C FINA L(TSCA ) wastes , and/o r Resourc e Conservatio n an dRecover y Ac t (RCRA ) waste s a t

th e followin g approve dfacilities ;

• A total of

8,01 0 ton s of

soi l an dsedimen t

wer e dispose da s Specia l Waste s a t Wast e Managemen t

Inc. , i n Norridgewock , Main e an dSawyer s Environmenta l Service s i n Hampden , Maine ;

. A tota l o f

11,22 2 ton s of

soi l an dsedimen t

wer e dispose da s TSC A and/o r RCR A waste s a t

Chemica l Wast e Managemen t

(CWM) , Inc. , i n Mode l City , Ne w York ; an d A tota l o f 12 5 ton s of

soi l an dsediment

wer e dispose da s RCR A waste s at Stablex , Inc. , i n Blainville , Quebec . Approximatel y 3,00 0 t o 4,00 0 ton s o f soi l an dsediment s containin g betwee n 1 an d1 0 pp mPCB s o r cPAH s an dles s than 24 8 pp mtota l lea dlocate doutsid e th e designate dare a(DA ) wer e excavate dan d place dwithi n th e DA . Soil s an dsediment s withi n th e D A containin g les s tha n or equal t o 1 0 pp mPCB s or cPAH s an dles s than 24 8 pp mtota l lea dwer e no t excavated . i Th e limit s of

excavatio n wer e base do n th e followin g thre e criteria : 1 ) analytica l results ; 2 ) isopach s (illustrate di n Drawing s C-0 5 throug h C-0 9 i n Appendi x B o f th e S C 10 0 Percen t

Remedia l Desig n Remedia l Actio n (RA ) Work

Pla n (CMP , 1996) ; an d3 ) visua l evidenc e of contaminatio n (se e Sectio n 3.1) . Followin g excavation , confirmatio n sample s wer e collecte da t th e bas e of

th e excavatio n t o determin e if th e concentration s of

PCBs , cPAH s an dlea dwer e belo w th e respectiv e targe t cleanu p goals . I f

asampl e exceede dth e targe t

cleanu p goals , excavatio n continued . If th e targe t

cleanu p goal s wer e met , th e sampl e wa s use da s aconfirmatio n sample , an dth e area * represente db y th e sampl e nod e wa s confirme da s closed . Pre-excavatio n an dmos t

confirmatio n sample s wer e collecte dat specifie dlocation s o n asamplin g grid , tha t wa s develope dt o provid e astatisticall y vali dapproac h for confirmin g tha t

th e Sit e ha dme t

th e targe t cleanu p goals . Additional rando msample s wer e collecte da s determine dnecessary i n th e fieldt o confirm attainmen t

o f targe t cleanu p goals . Th e statisticall y vali dfieldsamplin g progra mi s detaile di n th e Fiel d Samplin g Pla n (FSP) . A s show n i n Figur e 3 i n th e FSP , th e Sit e wa s divide dint o five (5 ) sampl e area s base do n contaminants , targe t cleanu p goals , th e Sit e history , geology , an darevie w o f th e R I data .

WOODAR D & CURRAN (97137.05 ) EXECUTIV E SUMMAR Y - Pag e i i , 9/2/9 8 LT/KT/ms/CM P SCRA/SCRARPT.DO C FINA LSampl e Are a1 i s th e DA . A tota l of 20 9 confirmatio n sample s wer e collecte di n Are a1 , an danalyze dfo r PCBs . Base do n astatistica l evaluation , th e 9 5 percen t uppe r confidenc e limi t

o f th e mean o f

th e dat ai s 0.6 3 ppm , whic h i s wel l belo w th e targe t cleanu p goal o f

1 0 pp mPCB s for

th e DA . I n addition , th e maximu mvalu e o f

th e PC B result s use dt o determin e Sit e closur e i s 9.6 3 ppm . Sinc e 10 0 percen t of th e analytical result s ar e belo w th e targe t cleanu p goa

l of 1 0 ppm , th e proportiona l tes t for Sit e closur e i s als o met . Sampl e Are a2 i s outsid e th e DA . A tota l of 11 4 confirmatio n sample s wer e collecte di n Are a2 , an d analyze dfor

PCBs . Base do n astatistica l evaluation , th e 9 5 percen t uppe r confidenc e limi t

o f th e mean of th e dat ai s 0.2 3 ppm , whic h i s wel l belo w th e cleanu p standar do f 1 pp mPCB s for

th e are aoutsid e th e DA . I n addition , th e maximu mvalu e o f th e PC B result s use dt o determin e Sit e closur e i s 0.8 1 ppm . Sinc e 10 0 percen t of th e analytica l result s ar e belo w th e targe t cleanu p goal o f

1 ppm , th e proportiona l tes t fo r Sit e closur e i s als o met . Sampl e Are a3 consist s o f tw o subareas , an di s delineate db y th e limit s o f th e Rigg s Broo k

Wetland s withi n th e fence dportio n o f

th e Site . A tota l of

4 9 confirmatio n sedimen t sample s wer e collecte di n Are a3 , an d analyze dfor

PCBs . Th e maximu mvalu e of th e PC B result s use dt o determin e Sit e closur e i s 4. 3 ppm , which indicate s tha t

10 0 percen t

of th e analytica l result s ar e belo w th e targe t cleanu p goal o f

5 pp mfor Are a3 . Sampl e Are a4 consist s of five subarea s almos t

entirel y withi n th e DA . A tota l o f 20 9 confirmatio n sample s wer e collecte di n Are a4 , an danalyze dfo r tota l lead . Base do n astatistica l evaluatio n of th e data , th e 9 5 percen t

uppe r confidenc e limi t

of th e mean o

f th e dat ai s 52. 1 ppm , whic h i s wel l belo w th e targe t cleanup goa

l o f 24 8 pp mfor

tota l lead . In addition , th e maximu mvalu e of th e tota l lea dresult s use dt o determin e closur e i s 22 2 ppm . Sinc e 10 0 percen t of th e analytica l result s ar e belo w th e targe t cleanu p goa l o f 24 8 ppm , th e proportiona l tes t for Sit e closur e i s als o met . A total of 2 6 sample s wer e als o collecte da t specifie dgri dlocation s (se e th e FSP ) i n Are a4 an danalyze d for TCL P lead , for

disposa l characterizatio n purposes . Base do n th e analytica l results , tw o sample s wer e contaminate dwit

h TCL P lea dexceedin g 5 mg/L . Th e maximu mconcentratio n of TCL P lea dwa s 55. 6 WOODAR D &CURRA N (97137.05 ) EXECUTIV E SUMMARY-Pag e h i 9/2/9 8 LT/KT/ms/CM P SCRA/SCRARPT.DO C FINA Lmg/L . Base do n analytica l results , thes e soil s wer e dispose dof a s RCRA-hazardou s waste s a t CW M an d Stablex\ Sampl e Are a5 consist s of tw o subarea s an dinclude s al l cPA H contaminatio n outsid e th e DA . Nin e confirmatio n sample s wer e collecte di n subare a5 A . Th e maximu mconcentratio n of cPAH s wa s 0.23 7 ppm , an dth e analytica l result s of al l nin e sample s wer e belo w th e targe t cleanu p goal of

1 ppm . Followin g tw o rounds ' o f

excavatio n an dsamplin g i n subare a5 B (adjacen t t o Rout e 17) , thre e final confirmatio n sample s were collected . Th e concentration s o f thes e thre e sample s range dfrom1. 2 t o 6. 6 pp mcPAHs , at depth s Rangin

g from1.4 t o 3. 3 fee

t belo w groun dsurface . Base do n alette r date dOctobe r

27 , 1997 , Main e Departmen t

of Environmenta l Protectio n (MEDEP ) approve dtha t n o furthe r

actio n wa s warrante d i n subare a5 B (MEDEP , 1997b) . Unite dState s Environmenta l Protectio n Agenc y (USEPA ) ha dprovide d previou s verba l approva l for n o further

actio n i n subare a5B . Prio r t o remediatio n o f

th e on-sit e wetlan dsediments , surfac e wate r wa s pumpe dou t

of th e wetland s an d handle di n accordanc e wit h th e 10 0 percen t

design . Base do n th e resul t of an Uppe r

Lagoo n sedimen t sampl e (29 5 pp mPCBs) , surfac e wate r fro mth e Uppe r

Lagoo n wa s pumpe dint o fra c tank s an ddispose d o f off-sit e at

Clea n Harbor s Inc. , Braintree , Massachusett s facilit y a s aTSC A waste . Base do n analytica l result s o f surfac e wate r

sample s (non-detect ) collecte dfro mth e Lower Lagoon , an dapprova l fro mUSEP A andMEDEP , surfac e wate r wa s pumpe dou t

of th e Lowe r

Lagoon , an ddischarge don-sit e i n th e Stag e 6 Area , adjacent

t o th e Uplan dMarsh , prio r t o remediatio n o f

thi s area . Th e discharg e of surfac e wate r

fro m th e Lowe r Lagoo n wa s monitore dan dcontrolle dt o preven t oversaturatio n o r

runof f fro mth e Stag e 6 Area . Surfac e wate r

fro mth e Uplan dMars h wa s pumpe dint o frac tank s t o facilitat e th e remediatio n of th e Uplan dMarsh . Approximatel y 24,00 0 cubi c yard s o f clea n backfil l (containin g les s tha n or equal t o 1 pp mPCBs , 1 pp m cPAHs , an d24 8 pp mlead ) wer e brough t o n Sit e t o regrad e th e Site . Th e entir e D A wa s covere dwith a n additiona l 1 2 inche s o f

clea n fill t o ensur e that , eve n i f thos e soil s contaminate dwith betwee n 1 an d1 0 pp m PCB s o r cPAH s wer e ever

disturbe db y potentia l futur e activitie s a t th e Site , th e PC B an dcPA H level s a t th e surfac e woul dlikel y b e les s tha n 1 pp mdu e t o mixin g wit h th e clea n soil .

WOODAR D & CURRA N (97137.05 ) EXECUTIV E SUMMAR Y - Pag e i v 9/2/9 8 LT/KT/ms/CM P SCRA/SCRARPT.DO C FINA LSite restoratio n include dre-establishin g drainag e pattern s t o achiev e discharge s t o Rigg s Broo k simila r t o thos e whic h existe dprio r

t o remediatio n of

th e Site . It

als o include drestoratio n of on-sit e wetland s an dth e establishmen t

o f approximatel y 0. 4 acre s of compensatory wetlands . A final sit e inspectio n wa s complete db y USEP A an dMEDE P o n Novembe r 12 , 199 7 concludin g tha t th e SCR A appeare dt o hav e bee n implemente di n accordanc e wit h th e S C 10 0 Percen t

Remedial Design . Th e final inspection'als o note dtha t several actio n item s remaine dt o b e complete d(se e Appendi x A) . A summar y o f projecte dactua l cost s fo r SCR A activitie s conducte dbetwee n Jul y 199 6 an dDecembe r 199 7 / ar e liste di n Tabl e 6 (total o f $6,872,000) .

WOODAR D &CURRA N (97137.05 ) EXECUTIV E SUMMAR Y - Pag e v 9/2/9 8 LT/KT/ms/CM P SCRA/SCRARPT.DO C FINA L

# D O l L J 

# mt^oc X ftpf

rtm X \dfe r

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### % UNITE D STATE S ENVIRONMENTA L PROTECTIO N AGENC Y REGIO N 1 JOH N F . KENNED Y FEDERA L BUILDIN G BOSTON , MASSACHUSETT S 02203-000 1 /



### Augus t 6/199 8 / i • 

### Norma n Michau d Central Main e Powe r Technica l Service s Dept . NAO A 4 1 Anthon y Avenu e Augusta , Main e 0433 0 \ 

### Re : Draf

t Sourc e Contro l Remedia l Actio n Report - date dApri l 27 , 199 8 

# f Dea r Mr . Michaud : • \ \ 

### EPA k 

### an dth e M E DE P ha s reviewe dth e above reference ddocumen t an dassociate dresponse s t o . ou r comments , date dDecembe r 22 , 1997 , an dha s n o further comments . Pleas e prepar e th e fina l -,cop y fo r submitta l t o bot h EP A an dth e M E DE P b y Septembe r 1 , 1998 . EP A need s thre e copies i o f thi s document . ) I f yo u hav e an y question s pertainin g t o thi s matter , pleas e contac t m e at (617 ) 573-9689 . Than k you . Sincere !

Lesli e McVicka

r Projec t Manager cc : Wilke s Harper , M E DE P Lor i Truesdale , Woodar dan dCurra n

Interne t Addres s (URL ) • http://www.epa.go v Recycled/Recyclabl e • Printe d wit h Vegetabl e Oi l Base d Inks o n Recycle d Pape r(Minimu m 25 % Postconsumer )

# S, WOODAR D &CURRA N

Engineerin g • Scienc e • Operation s CORPORAT E OFFICES : Maine , Massachusetts , Ne w Hampshire , Connecticut , Illinois , Florid a Operationa l office s throughou t th e U.S .

Septembe r

4 , 199 8

Ms . Lesli e McVicka r U.S . Environmenta l Protectio n Agenc y 90Canal / Street(l s l Floor ) Boston , M

A 02114 " ( / RE : ( O'Conno r

Compan y Superfun dSit e ) Fina l Sourc e Contro l Remedia l Actio n Report Dear Leslie : I n accordanc e wit

h you r lette r date dAugus t

6 , 1998 , enclose dfor

submitta l ar e thre e copie s o f th e Fina l Sourc e Contro l Remedia l Actio n Report . Pleas e cal l m e a

t 207-774-211 2 i

f yo u hav e any question s or comments .

. ; Sincerely, ; WOODAR D & CURRAN , IN C



## •uu& c Lor i E . Truesdale , P.E . Projec t Enginee r

cc : Michae l Penzo , Raytheo n Environmenta l Service s - 2 copie s Wilke s Harper , MEDE P - 2 copie s Nor mMichaud , CM P - 2 copie s Henri Vincent , W& C - 1 cop y

4 1 Hutchin s Driv e i Portland , Main e 0410 2 i 207-774-211 2 o 207-774-663 5 (Fax ) • 1-800-426-426 2 • www.woodardcurran.co m "