SITE INFORMATION AND CORRESPONDENCE 1993-1995

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• i ° Pacific Gas and Electric, Company Environmental Services P.O.Box 7640 San Francisco, CA 94120 415/973-7000 Direct Dial 415/973- December 21, 1994 Telecopy 415/973-9201 James L. Tjosvold, P.E. Chief, Site Mitigation Branch u r 2 3 1994 California Environmental Protection Agency 10151 Croydon Way, Suite 3 ENVIRONMENTAL HEALTH Sacramento, CA 95827 PERMITISERMCES Attention: Mr. Fernando Amador Dear Mr. Tjosvold: Re: Docket#HSA 90/91/08 - Stockton Former Manufactured Gas Plant Site Subject: Quarterly Summary Report Pacific Gas and Electric Company(PG&E) submits this third and fourth quarter summary report for the Stockton Former Manufactured Gas Plant Site (site) in accordance with Provision 3.7.of the above referenced consent order. This report summarizes technical activities conducted by PG&E in compliance with the order from July 1, 1994 to December 9, 1994 and activities planned for the next quarter. I. Activities Performed During Previous and Current Quarter: The second round of groundwater sampling for 1994 occurred on July 21, 1994. Laboratory results were received on August 20, 1994. A quarterly monitoring report, containing the results of this groundwater monitoring round and the first quarterly monitoring round (conducted in January, 1994), was submitted to DTSC on September 13, 1994. On August 31, 1994, PG&E received permission from the City of Stockton to install three to five new groundwater monitoring wells on city right-of-way. The Phase IIIc field investigation began on October 3, 1994. Six new wells were installed during the Phase IIIc field investigation: a new A zone well, MW-18; two new B zone wells, MW-17 and MW-19; and three new C zone wells, MW-14, MW-15 and MW-16. Also, an existing well in the A zone, MW-1, was replaced due to a kink in the casing. Installation of the new groundwater monitoring wells was completed on November 11, 1994. All groundwater monitoring wells, existing and new, were sampled the week of November 14, 1994. Analytical results are expected by December 16, 1994 and a technical memorandum will be submitted on or about February 1, 1995 containing the groundwater monitoring results.