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Pacific Gas and Electric. Company Environmental Services <br /> P.O.Box 7640 <br /> San Francisco,CA 94120 RECEIVED <br /> 415/973-7000 <br /> Direct Dial 415/973- <br /> April 28, 1994 Telecopy415/973-9201 MAY e 21994 <br /> Vr1uvi r lLL <br /> SAN FRANCISCO <br /> James L. Tjosvold,P.E. <br /> Acting Branch Chief, Site Mitigation Branch <br /> California Environmental Protection Agency <br /> r Department of Toxic Substances Control <br /> 10 15 1 Croydon Way, Suite 3 <br /> Sacramento, CA 95827 <br /> Attention: Mr. Fernando Amador <br /> Re: Docket#HSA 90/91-008 - Stockton Former Manufactured Gas Plant Site (Site) <br /> Dear Mr. Tjosvold: <br /> Based on our discussions during our meeting on March 11, 1994 and considering the <br /> subsequent refusals by the Stockton Fire Department and the Housing Authority of the <br /> County of San Joaquin (Housing Authority) to allow PG&E to install monitoring wells <br /> on their respective properties, the following modifications will be made to the Phase <br /> IIIc Workplan: <br /> 1. Install a Zone B well (MW-20) near MW-9. <br /> Justification: This well will be used for the Zone B aquifer test and may act as <br /> a remediation well. <br /> 2. Install a Zone C well (MW-16) in the Church Street right-of-way near the <br /> Housing Authority parking lot. <br /> Justification: This well will provide downgradient water quality data for Zone <br /> C. <br /> 3. Install a new Zone C well (MW-14) in the Commerce Street right-of-way near <br /> the southernmost point of the Fire Department's field closest to the site. <br /> Justification: This location has better site access, will be a safer place to work <br /> and will be directly upgradient of the site. <br /> 4. Install a Zone A well (MW-18) east of MW-10 and possibly a Zone A well <br /> (MW-19) near(MW-14). <br /> Justification: Well (MW-18)will help delineate the horizontal extent of the <br /> Zone A groundwater plume. If(MW-14) zone A Hydropunchrm analysis <br /> shows contamination, (MW-19) will be installed near (MW-14), otherwise, <br /> (MW-19) will not be installed. <br />