Centra l Main e Powe r (207 ) 626-962 0 Engineerin g Department , N.A.O.A . FA X (207 ) 626-963 3 Ediso n Drive , Augusta . Main e 0433 6 Augus t 4 , 1995 VI A EXPRES S MAI L SDM S Docl ° 28253 5 Supcrfun dRecord s Cente r SITt : Q Mr . Ros s L . Gilleland , RP M B h L A K : U.S . Environmenta l Protectio n Agenc y O IIiLK : Main e an dVermon t

Superfun dSectio n 9 0 Cana l Stree t J.F.K . Federa l Buildin g (HPS-CAN1 ) Boston , Massachusett s 0211 4 RE : O'CONNO RCOMPAN Y SUPERFUND SIT E AUGUSTA , MAIN E SUPPOR T FO RSELECTIO N O FTHE CONTINGENC Y CLEANUP PLA N SUPPLEMENTA L INFORMATIO N Dear Mr . Gilleland : Centra l Main e Power

Compan y (CMP ) i s providing , herein , additiona l informatio n t o support changin g th e Sourc e Contro l portio n o f th e Remedial Actio n fo r th e O'Conno r Compan y Superfun dSite (Site ) fro msolven t extractio n t o th e Contingenc y Cleanu p Plan . Thi s submitta l i s i n direct respons e t o th e U.S . Environmenta l Protectio n Agency' s (EPA ) Jun e 16 , 199

5 lette r t o CM P whic h requeste dspecifi c informatio n regardin g CMP' s intention s t o evaluat e othe r treatmen t

technologie s an dth e Contingenc y Cleanu p Plan establishe di n th e 199

4 Explanatio n o f

Significan t

Difference s (ESD) . Th e ES D signe do n Jul y 11,199 4 "allow s fo r off-sit e disposa

l i n accordanc e with federa l an d stat e law s shoul dEPA , afte r consultatio n with th e DEP , determin e tha t full-scal e implementatio n o f

solvent extractio n i s no t

feasibl e a t thi s site. " Th e ES D furthe r state s that "soil s wil l no t

hav e t o b e treate dprio r t o off-sit e disposa

l shoul dth e EP A make th e determinatio n tha t

treatmen t

i s no t feasible. " CM P believe s tha t

sufficien t data , analyses , an dSite-specifi c desig n an dexperienc e no w exis t t o suppor t

adeterminatio n tha t

solven t extractio n i s no t

feasibl e at

th e Site . CM P furthe r hold s that

th e Contingenc y Cleanup Pla n describe di n th e ES D satisfie s th e criteri a establishe dunde r

Comprehensiv e Environmenta l Respons e Compensatio n an dLiabilit y Ac t (CERCLA ) fo r

selectio n o f

remedy . Specifically , CM P believe s that th e Contingenc y Cleanup Pla

n satisfie s CERCLA' s requiremen t that EPA selec t

aRemedial Actio n "tha t utilize s permanen t

solution s an dalternativ e treatmen t technologie s o r

resourc e recovery technologie s t o th e maximu mextent practicable. " (CERCLA §12 1 (b)(l) , (emphasi s added) .

### R . L . Gilleland , RPM

Pag e 2 Augus t 4 , 199 5 Informatio n i s presentedi n th e attache dreport t o assis t EP A i n evaluatin g th e infeasibilit y o f implementin g th e solvent extractio n remedy a

t th e Site ; i n addition , CM P wishe s to demonstrat e ho w th e Contingenc y Cleanu p Pla n meet s th e requirement s o f CERCLA an d th e Nationa l Contingenc y Plan (NCP) . Finally , informatio n i s presente dwhic h indicate s that alternativ e treatmen t

technologie s t o solven t

extractio n will Likel y no t

offe r asubstantiall y bette r opportunity fo r

atreatment-base dSourc e Contro l remedy . CM P propose s submitta l o f arevise dRemedia l Design Wor k Plan withi n 6 0 day s o f

you r writte n acceptanc e o f

th e Contingenc y Cleanu p Plan . Th e Remedia l Desig n Work Pla n woul dspecif

y th e general scop e o f

effort , deliverables , an dschedul e associate dwith implementin g th e Contingenc y Cleanu p Plan . CM P appreciate s you r

consideratio n o f

thi s submittal . Pleas e call i f yo u hav e an y questions . Sincerely , CENTRAL MAIN E POWE RCOMPAN Y

Terenc e R . Peacock , P.E . Projec t Coordinato r TRPrlhr Attachmen t cc : L . M . Brausch , Westinghous e L . W . Brown , DE

P J . A . Klaiber , GEI W . H . Laubenstein , IH , Esquire M . Pothier , CD M Federa l Program s