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,FR(7M :s Geo-Phase Environment' Inc. FAX N0. 2095690295 Feb. 11 2000 09:25AM P3 <br /> CEO-PHASE <br /> EINMRONMEWAL <br /> lz'ebruary 9, 2000 <br /> Pralect Ncy- 20?-3 <br /> Project Name: Manna Pro(El Dorado) <br /> Ms. Wenuilyn tea. <br /> Statc Water itesourcLs Control Board <br /> Division of Clean Water P rngrarns <br /> Cleanup Fund Unit <br /> P.O. Box 941212 <br /> Sacramento, CA 94244-2120 VIA FAX <br /> RE! pre Approval Request, Claim Number 676 <br /> Fornxer Manna Pro Facility,4004 S.El Dura,do,Stockton, CA <br /> Remedial Pilot'Test&Feusibility Study <br /> Dear Ms. Fua <br /> Based on a recent telephone conversations with Harlinndll, the LOP rase officer for the <br /> Subject site, I understand there are same coneerns on your part regarding elements of the <br /> Work Plan fr)r the subject: pilot ! feasibility study, specifically regardin#; Oxygen Release <br /> Compound((lRQ pilot testing_ I trust the following points wilt address your concerns: <br /> • .As you know from reading our Work Plan, it is anticipated that one cflect of On-, proposed <br /> bparging & sVE work will be to rause a "mound" in the groundwater surface. On.0 <br /> undesirable effect the "mounT may have is to spread bydrocarbons from the highiy <br /> wntamina ed core of the mound to the lower periphery where they mould presumably be <br /> transported clown-gradient with the normal flaw of groundwater- In order to mitigate this <br /> affect, the Work Plan propoaed to test the feasibility of controlling the lateral apread of <br /> gaycaiine hydrocarbona by placing ORC material in the down-gradient Position of the <br /> sparge 1 SVE work area. <br /> • Laet year Geo-Phase Environmental responded to a bid request by the RP, Manna Pro fhr <br /> an ORC pilot test. No other work was called for in the requested scope of work. Geo- <br /> PbaRe won: the bid and waa named as Maims-Preis consultant for this site. Manns-Pro's <br /> (:FO, Mr. john Minacd, tb.en submitted the bid do(unsents to the USTC CFF issued o <br /> Work Plan had been submitted to the LOP agency, Subsequently, the <br /> letter of lyre-approval for the costs associated with the pilot ORC'. work. Shortly after the <br /> pre-approval letter was issued,a meeting was held on June 3, 1999 which was attended by <br /> representatives of Manna Pm, Geo-Phage, the RWQCR and the LOP agency- The meeting <br /> was held at the offipoes of the San Joaquin County Public Health Sorvice - Environmental <br /> Phone- (2097 569-9293 <br /> 2937�'exleuaxln 11vGat�e,4ui7,e B`2A0 Cxeo—l'�saae Ex�v#ronmentml Inc. �,�: (20)569-0295 <br /> Modesto,Ca 95356 <br />