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Pacific Gas and Electric. Company Environmental Services <br /> P.O.Box 7640 <br /> San Francisco,CA 94120 <br /> 415/973-7000 <br /> Direct Dial 415/973- <br /> January 24, 1997 Telecopy 415/973-9201 o <br /> James L. Tjosvold, P.E. <br /> Chief, Site Mitigation Branch r, <br /> California Department of Toxic Substances Control <br /> 10151 Croydon Way, Suite 3 <br /> Sacramento, CA 95827 s <br /> Attention: Mr. Fernando Amador <br /> Dear Mr. Tjosvold: <br /> Re: Docket#HSA 90/91/08 - Stockton Former Manufactured Gas Plant Site <br /> Subject: Quarters Summary Report (Fourth Quarter. 1996) <br /> Pacific Gas and Electric Company(PG&E) submits this fourth quarter(1996) summary report <br /> for the Stockton Former Manufactured Gas Plant Site (site) in accordance with Provision 3.7 <br /> of the above-referenced order. This report summarizes technical activities conducted by <br /> PG&E in compliance with the order from October 1, 1996 to December 31, 1996 and <br /> activities planned for the next quarter. <br /> I. Activities Performed During Previous Ouarter: <br /> The draft schedule submitted to the agencies on June 6, 1996 included several agency <br /> meetings to be conducted prior to submittal of the draft soil and groundwater Feasibility <br /> Study(FS). These meetings and/or conference calls include discussion and agreement on: <br /> Area I soil source areas; ARARs; screening of soil and groundwater remediation technologies; <br /> VLEACH model and mixing cell model input parameters and preliminary model results; the <br /> use of the VLEACH model and mixing cell model during the FS; and preliminary and detailed <br /> evaluation of remedial action alternatives. Several of these meetings were conducted during <br /> the third quarter, 1996, as described below: <br /> • On August 8, 1996, PG&E, DTSC and the RWQCB met to discuss future activities at the <br /> site. Agreement was reached on the soil and groundwater goals for the FS (as discussed <br /> in PG&E's June 5, 1996 letter). It was also agreed that Zone A groundwater had been <br /> characterized, that no new Zone C groundwater monitoring wells are needed at present, <br /> and that PG&E will further characterize the soil source areas in Area I and investigate the <br /> diesel and PNAs found in Zone B groundwater in Area II. <br />