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t <br /> Pacific Gas and Electric Company 77 Beale Street,Room 2456-B24A Robert C.Doss, PE. <br /> San Francisco, CA 94105 Director <br /> 415/973-7601 Site Remediation <br /> Fax 415/973-9201 Environmental Services <br /> Internet RLDLQpge.com <br /> November 7, 1995 <br /> P0. Box 7640 <br /> San Francisco,CA 94120 <br /> James L. Tjosvold, P.E. <br /> Acting Chief, Site Mitigation Branch <br /> California Environmental Protection Agency <br /> Department of Toxic Substances Control <br /> 10151 Croydon Way, Suite 3 <br /> Sacramento, CA 95827 <br /> Attention: Mr. Fernando Amador <br /> Dear Mr. Tjosvold: <br /> Re: Docket No. HSA 90/91-08 - Stockton Former Manufactured Gas Plant Site <br /> Subject: Submittal of the Soil 012eLable Unit FeasibilijX Stud <br /> Enclosed are two copies of the"Draft Soil Operable Unit Feasibility Study, PG&E <br /> Stockton Former Manufactured Gas Plant Site". This Soil Operable Unit Feasibility Study <br /> (Soil OUFS)proposes a remedial action for soils at Pacific Gas and Electric Company's <br /> (PG&E's) former manufactured gas plant site at 535 Center Street in Stockton. The Soil <br /> OUFS is being submitted under Section III of the Department of Toxic Substances <br /> Control's (DTSC's) Consent Order Docket No. HSA 90/91-008. <br /> The purpose of the remedial action is to reduce the potential for migration of chemicals of <br /> potential concern(COPC) from the soil to the groundwater and to minimize direct <br /> exposure to these chemicals in soil or in soil vapor. Limited source removal, combined <br /> with in situ shallow soil mixing of potential source areas with cement binders to solidify <br /> and immobilize COPC, is proposed. A treatability study to further evaluate the <br /> effectiveness of shallow soil mixing at this site is also recommended. <br /> This draft Soil OUFS also contains the results of a supplemental soil investigation <br /> conducted during the summer, 1995 to define the extent of soil source areas. Four <br /> potential soil source areas have been identified for remediation as a result of the <br /> supplemental soil investigation and of previous soil and groundwater investigations. <br /> As agreed to by PG&E and DTSC in April, 1995, a separate Feasibility Study addressing <br /> groundwater will be submitted in June, 1996. <br />