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Pacific Gas and Electric. Company Environmenlal Services _ <br /> '. P.O.Box 7640 p, <br /> San Francisco, CA 94120 f�' <br /> 415/973-7000 <br /> Direcl Dial 415/973- � .ji <br /> April 24, 1996 Telecopy415/973-9201 Zg <br /> James L. Tjosvold, P.E. <br /> Chief, Site Mitigation Branch <br /> California Department of Toxic Substances Control <br /> r 10151 Croydon Way, Suite 3 <br /> Sacramento, CA 95827 <br /> Attention: Mr. Fernando Amador <br /> Dear Mr. Tjosvold: <br /> Re: Docket #HSA 90/91/08 - Stockton Former Manufactured Gas Plant Site <br /> Subject: Quarterly Summary Report (First Quarter, 1996) <br /> Pacific Gas and Electric Company(PG&E) submits this first quarter(1996) summary <br /> report for the Stockton Former Manufactured Gas Plant Site(site)in accordance with <br /> Provision 3.7 of the above-referenced order. This report summarizes technical activities <br /> conducted by PG&E in compliance with the order from January 1, 1996 to March 31, <br /> 1996 and activities planned for the next quarter. <br /> I. Activities Performed During Previous Ouarter: <br /> The draft Soil Operable Unit Feasibility Study (OUFS) was submitted to DTSC and the <br /> RWQCB for their review and comment on November 7, 1995. The Soil OUFS identified <br /> potential soil source areas and proposed a soil remedial action for these source areas. The <br /> purpose of the proposed soil remedial action is to reduce the potential for migration of <br /> chemicals of potential concern from the soil to the groundwater and to minimize direct <br /> exposure to these chemicals in soil and in soil vapor. The proposed soil remedial action is <br /> removal of tar in the former tar pit, combined with in situ shallow soil mixing of other <br /> potential source areas using cement binders to solidify and immobilize constituents of <br /> potential concern. A treatability study to further evaluate the effectiveness of shallow soil <br /> mixing at this site was also recommended. Included in the Soil OUFS are the analytical <br /> results of supplemental soil sampling conducted at the site in the summer, 1995. <br /> A meeting was held on November 30, 1995 between DTSC, the RWQCB and PG&E to, <br /> discuss the draft Soil OUFS. At the meeting, a presentation was made on the potential <br /> soil source areas, the soil remediation technologies evaluated during the FS process and <br /> the preferred remedial action. The treatability study proposed for the preferred remedial <br />