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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 25, 1996 Telecopy 415/973-9201 <br /> James L. Tjosvold,P.E. RECF,1 � <br /> Acting Chief, Site Mitigation Branch <br /> California Department of Toxic Substances Control AN 2 91996 <br /> 10151 Croydon Way, Suite 3 HEALTH <br /> Sacramento, CA 95827 ENVIRONMENTAL <br /> Attention: Mr. Fernando Amador <br /> PERMIT I SERVICES <br /> Dear Mr. Tjosvold: <br /> Re: Docket#HSA 90/91/08 - Stockton Former Manufactured Gas Plant Site <br /> Subject: Quarterly Summaa Report (Fourth Quarter. 1995) <br /> Pacific Gas and Electric Company(PG&E) submits this fourth quarter (1995) summary <br /> report for the Stockton Former Manufactured Gas Plant Site (site) in accordance with <br /> Provision 3.7 of the above-referenced consent order. This report summarizes technical <br /> activities conducted by PG&E in compliance with the order from October 1, 1995 to <br /> December 31, 1995 and activities planned for the next quarter. <br /> I. Activities Performed During Previous Quarter: <br /> The supplemental soil investigation, which was conducted in accordance with the June 12, <br /> 1995 workplan, began June 28, 1995 and was completed July 5, 1995. During the <br /> investigation, twenty-four soil borings were drilled to a depth of approximately 25 feet <br /> (unless refusal was encountered) and 62 samples were collected. Both field analyses <br /> (using Handby test kits) and laboratory analysis were performed to determine the <br /> concentration ofPNAs and total petroleum hydrocarbons in the soil samples. Soil samples <br /> were also analyzed for benzene, toluene, ethylbenzene and xylene in the laboratory, and 25 <br /> soil samples were analyzed for additional parameters in the laboratory (pH, cyanide, grain <br /> size analysis, moisture content and total organic carbon). The results of this supplemental <br /> soil investigation were included in the draft Soil Operable Unit Feasibility Study (Soil <br /> OUFS) submitted to the Department of Toxic Substances Control (DTSC) and the Central <br /> Valley Regional Water Quality Control Board (RWQCB) on November 7, 1995, <br /> On August, 17, 1995, PG&E submitted to DTSC its proposed remedial action objectives <br /> for the Stockton project. These proposed remedial action objectives and goals were to be <br /> used to develop and evaluate possible alternatives in the Soil OUFS. In the August 17, <br /> 1995 letter, PG&E proposed submitting the draft Soil OUFS to DTSC and the RWQCB <br />