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HYDRO • . ENVIR40NMENTAL TECHNOLOGIES,INC. • Mr P E Copple April 7, 2004 Page 3 to 50 feet bsg Samples will be submitted using the appropriate chain of custody DP drilling techniques generally do not generate excess drill cutting, however, drilling and sampling equipment is cleaned after each boring to mitigate cross contamination Therefore, nnsate water must be contained and removed to an appropriate recycling facility, nnsate water analyses may be required Soil cuttings and nnsate water will be drummed in 55-gallon UN rated steel drums that will be sampled and managed according to results of sample analyses The ground water flow direction at the site was determined to be to the northeast or northwest One ground water grab sample will be collected from the approximate depth of the water table in each borehole Task 2: Sample Analysis Soil and ground water samples will be analyzed for TPH as diesel, TPH as gasoline, BTEX with MTBE using USEPA Method 8021 and 8015 modified Collected samples will be submitted to a California accredited laboratory for analysis Task 3: Report i HETI will prepare a draft written report of the findings prior to the client authorizing a final written report of ® the completed tasks as outlined in this proposal HETI's report will include a sample location map, a summary of the analytical data (with analytical data sheets and chain of custody forms in an appendix) and appropriate conclusions and recommendations (if warranted) A California RG will review and sign the report If you have any questions concerning this work plan, please call We look forward to working with you on this project Sincerely, Hydro-Environmental Technologies,Inc. Cy Chia P Avakian, REA Senior Project Scientist cynthtaa@hydroenvi onmental com Do glas S Pierce, R G Senior Project Geologist dougp@hydroenvironmental com cc Ms Lori Duncan, San Joaquin County Public Health Services Attachments (Site Location and Proposed Monitoring Well Location)