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gy DEFENSE LOGISTICS AGENCY DEFENSE DISTRIBUTION DEPOT SAN JOAQUIN P.O.BOX 960001 STOCKTON,CA 95296 IN REPLY DDJC-FA February 14, 2001 REFER TO: Mr. Michael Work U.S. Environmental Protection Agency Region 9 75 Hawthorne Street San Francisco, CA 94105-3901 Dear Mr. Work: Pursuant to the DDJC-Tracy Site Federal Facilities Agreement (FFA), Defense Distribution Depot San Joaquin(DDJC) requests an extension for the Tracy Water Management Report, Operable Unit (OU 1) Groundwater Pesticides Design, Soil Vapor Extraction(SVE) System Optimization Work Plan, Alternative Cover Site Design for the North Depot Soils Area, the Remedial Action Report for the North Depot Soils Area, and the Amendment to the Record of Decision(ROD) for DDJC-Tracy. These extensions are requested in accordance with Sections 9.2(e) and 26.1 of the FFA. The Water Management Report extension is requested to adjust for extended review periods of the draft Water Management Report document, submitted on December 15, 2000. The OU I Groundwater Pesticides Design extension is needed to accommodate direction to perform additional evaluation of extraction scenarios and present this information at the April 25, 2001, RPM meeting before proceeding with the design. The SVE System Optimization Work Plan extension is requested to better reflect the actual amount of time required to collect sufficient initial operations data on the SVE systems and to develop a strategy for optimization. This extension is based on the amount of time required for similar efforts at the DDJC-Sharpe Site. The Alternative Cover Site Design extension is needed to enable DDJC-Tracy to complete a bench study, prepare a report and present results at the April 25, 2001, RPM meeting to achieve concurrence on the approach before proceeding with completing this effort. The Remedial Action Report extension is needed because any remedial actions based on approved designs will be delayed by the Alternative Cover Site Design schedule delays. The Amendment to the ROD extension is required because additional slip pages are required to finalize the Baseline Ecological Risk Assessment for SWMU 4, and this document will need to be finalized before the Environmental Protection Agency (EPA) can provide direction on how to structure the approach to S WMU 4 in the ROD Amendment document. A►