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ENV. <br /> AMERICA D <br /> 244 California Street, Suite 500 JAN 2 4 2005 <br /> San Francisco, CA 94111 <br /> (415)989.9933 ENVIRONMENT HEALTH <br /> Fax(415)9erica 4 <br /> wPERMIT/SERVICES <br /> ww.envamenca.com <br /> January 20, 2005 <br /> Mr. Duane White <br /> Department of Toxic Substances Control <br /> 8800 Cal Center Drive <br /> Sacramento, California 95826-3200 <br /> RE: Additional Groundwater Assessment <br /> Vicinity of Well MW26R <br /> Former Manufactured Gas Plant Site <br /> Stockton, California <br /> Dear Mr. White: <br /> ENV America Incorporated (ENV America) has prepared this letter on behalf of Pacific Gas <br /> and Electric Company (PG&E) for the former manufactured gas plant (MGP) site (Site) <br /> located in Stockton, California. This letter has been prepared in response to a request by <br /> the California Department of Toxic Substances Control (DTSC) in a December 21, 2004, <br /> letter to PG&E. In that letter, the DTSC indicated that acenaphthene concentrations in <br /> MW26R have increased since 1997. The DTSC requires that PG&E evaluate the <br /> groundwater conditions, identify and define the problem, and propose a solution to meet <br /> groundwater goals. The DTSC requested that PG&E submit plans to address the <br /> groundwater conditions in the vicinity of MVV26R within 30 days of their letter. In the letter, <br /> the DTSC also approved the decommissioning of eight existing wells at the Site and <br /> requested a well decommissioning work plan from PG&E. <br /> PG&E will submit a work plan to evaluate the groundwater conditions in the vicinity of <br /> MW26R and to decommission eight existing wells. The work plan will be submitted to the <br /> DTSC by February 25, 2005. The approach for assessing the extent of acenaphthene <br /> concentrations in groundwater in the vicinity and downgradient of MW26R will be <br /> presented in the work plan. A new groundwater monitoring well downgradient of MW26R <br /> will be proposed in the work plan. The construction details and location of the <br /> downgradient well will be discussed in the work plan. An estimated schedule for the <br /> assessment, well decommissioning, and well installation will be included in the work plan. <br />