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a S d 9 ~ � Z v January 17, 1989 C] UNITED STATES ENVIRONMENTAL PROTECTION AGENCY REGION IX Colonel John M. Chessnoe Sharpe Army Depot Lathrop, CA 95331 215 Fremont Street San Francisco, Ca. 94105 ra C Ell t: AP R i 11993 A LT Ill e L -PE Re: Sharpe Army Depot (SHAD) Draft Remedial Investigation/Feasibility Study Report Dear Colonel Chessnoe: The U.S. Environmental Protection Agency, the Department of Health Services, and the Regional Water Quality Control Board (the agencies) have reviewed the initial draft Remedial Investigation Report dated August 1988. This draft report was prepared b Environmental Science and Engineering, Inc. for Sharpe Army Depot and was intended to incorporate the agencies'. concerns presented in our 11 February 1988 letter based on our review of a previous draft of this report. In our 11 February letter, the agencies expressed concerns regarding the incomplete correiation, analysis, and presentation of remedial investigation data, and the Army's proposal for additional work. Rather than repeating our comments, we have reviewed the interpretation of the contaminant sources and groundwater data. The enclosed are the agencies' conclusins about the results of the Remedial Investigation at SHAD to date and the anticipated future work to complete this investigation. These comments are of critical importance and must be incorporated in the next draft Remedial Investigation report. As soon as possible after receiving this letter, please contact the agencies to schedule a meeting to discuss and review our results and comments in detail. Shortly after our meeting, SHAD should document the issues discussed and the responses to U.S. EPA's review. All future work shall be identified by SHAD in the draft RI/FS report pursuant to the Interagency Agreement. In our review of this report, we have integrated the results from existing reports, including contaminant sources and soil gas and groundwater sampling data, previously submitted by SHAD. The comprehensive and synergistic results from our review are presented in Attachments A through D, illustrating the need for such an integrated approach for all future decisions and recommendations about the extent of contamination at SHAD and its treatment. I' We compiled the contaminant source information into a database (Attachment A) and mapped the known or inferred contaminant source areas on a base map as Solid Waste Management Units (SWMUs), Potential SWMUs, and Areas of Concern (AOCs) (Attachment' B). We enlarged the soil gas contour maps (from ESE, 1987b) to fit the scale of the base map and made mylar overlays of these so that they can be superimposed on the base map.