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---------------------------------——————--———————----- ——————-'——————————————————— -- } '01/62,,1900 09:46 FROM TO 12694656831 P.64 Mr. Russell Chapin October 16, 190 Page 4 In our opinioz4 this phase of the investigation would be best performed after { the results of sample analyses from tank removal are available,so that the P delineation program can address all known contaminant sources. Roger Foott Associates, Inc. could submit the Preliminary,Assessment Report within three weeks of tank removal. The results of the preliminary assessment investigation would be presented in a Problem Assessment Report,which will present the data used to indicate the extent # of contamination,calculated groundwater surface elevation maps,soil stratigraphy data, preliminary aquifer parameters as necessary to define remedial alternatives, and a discussion of appropriate remedial alternatives. We would expect that the Problem Assessment Report would be completed within 3 to b months of approval of the Preliminary Assessment Report,depending on the extent of contamination and the need for offsite drilling. When the Problem Assessment Report is completed and accepted by regulatory agencies, a Final Remedial Pian(FRP)will be required after appropriate discussions with regulatory agencies and final field and laboratory tests. The FRP would present details of the remedial plan (number andlacement of wells,s, um in p P g rate,limits of excavation,vent lines,waste disposal, etc.). A schedule of implementation would also be presented. A copy of this work plan should be forwarded to Mr.Harlan Knoll of the San Joaquin County Public Health Services,Environmental Health Division,Post ice Box 2009,Stockton,California,95201. r i a i r ROGER FQDTT