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Mr. Russell Chapin <br /> October 9, 1992 <br /> Page 4 <br /> • Distance to adjacent buildings and their water and sewer lines. <br /> • Proposed sampling methodology. <br /> Tn our opinion, this phase of the investigation would be best performed after <br /> the results of sample analyses from tank removal are available, ao that the <br /> delineation program can address all known contaminant sources. Roger Foott <br /> Associates, Inc. could submit the Preiimi_nary Assessment Report within three wCeks <br /> of tank removal. <br /> The results of the preliminary assessment investigation would be presented in <br /> a Problem Assessment Report,which will present the data used to indicate the extent <br /> of contamination, calculated groundwater surface elevation maps, soil stratigraphy <br /> data, preliminary aquifer parameters as necessary to define remedial alternatives, <br /> and a discussion of appropriate remedial alternatives. We would expect that the <br /> Problem Assessment Report would be completed within 3 to S months of approval of <br /> the Preliminary Assessment Report, depending on the extent of contamination and <br /> �.. the reed for offsite drilling. <br /> When the Problem Assessment Report is completed and accepted by <br /> regulatory agencies, a Final Remedial Plan (FRP)will be required after appropriate <br /> discussions with regulatory agencies and final field and laboratory tests. The FRP <br /> would present details of the remedial plan (number and placement of wells, pumping <br /> rate, limits of excavation,vent lines,waste disposal, etc.). A schedule of <br /> implementation would also be presented. <br /> A en-py of this work plan should be forwarded to Mr. Harlan Knoll of the San <br /> Joaquin ''ounty Public Health Services, Environmental Health Division, Post Office <br /> Box 2009, Stockton, California, 95201. <br /> M (.I R <br /> FQDTT <br /> i55OC 1-ITL <br />