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ENV. <br /> A M E R I C A DDDC�dED <br /> 244 California Street, Suite 500 L� v <br /> San Francisco,CA 94111 o <br /> (415)989-9933 �' "i 2 v Z005 <br /> Fax(415)989-9934 <br /> w .envemenca.com ENVIRONMENT HEALTH <br /> February 25, 2005 <br /> PERMITISERVICES <br /> Mr. Duane White <br /> Department of Toxic Substances Control <br /> 8800 Cal Center Drive <br /> Sacramento, California 95826-3200 <br /> RE: Revised Cost Estimate for Financial Assurance <br /> Long-term Operation and Maintenance <br /> Former Manufactured Gas Plant Site <br /> Stockton, California <br /> Dear Mr. White: <br /> ENV America Incorporated (ENV America) has prepared this revised cost estimate on <br /> behalf of Pacific Gas and Electric Company (PG&E) for the former manufactured gas plant <br /> (MGP) site (Site) located in Stockton, California. The revision was requested by the <br /> California Department of Toxic Substances Control (DTSC). The original Cost Estimate for <br /> Financial Assurance was transmitted to the DTSC on January 11, 2005. The DTSC <br /> requested that the cost estimate for annual groundwater monitoring be revised to include a <br /> new well downgradient of MW-26R that PG&E is proposing in a separate work plan to be <br /> submitted to the DTSC by March 4, 2005. <br /> The revised cost estimate and details are shown on Tables 1 and 2. The estimated total <br /> net present value for 30 years of operations and maintenance at the Site is $460,900. <br /> Please call us at 451-989-9933 or Ms. Betsy Brunswick of PG&E at 415-973-1642 if you <br /> need additional information or have questions. <br /> Sincerely, <br /> ENV America Incorporated 1 <br /> Veen Chee Foong, PE Voytek Bajsarowicz <br /> Senior Project Manager Principal <br /> cc: Ms. Betsy Brunswick, PG&E <br /> Mr. Darrell Klingman, PG&E <br /> Mr. Gerald Djuth, CV-RWQCB <br /> Mr. Jeff Wong, San Joaquin County EHD <br /> Attachments: Table 1 — Revised 30-year Cost Estimate: Site Operations and Maintenance <br /> Table 2 — Revised Detail Cost Estimates for Tasks <br /> P:\PG&E\Stockton\Report\Financial Assurance\Revised OM$est 25Feb2005.doc <br />