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r'z <br /> -BOARD OF TRUSTEES SAN JOAQUIN LOCAL HEALTH DISTRICT SERVING <br /> AI Crow,Pres. San Joaquin County <br /> Earl Pimentel,Vice Pres, 1601 East Hazelton Avenue City of Manteca <br /> Tommy Joyce,Sec'y. Stockton,California 95205 City of Escalon <br /> James F.Culbertson City of Lodi <br /> John D.Mast M.D. JOGI KHANNA, M.D., M.P.H., DISTRICT HEALTH OFFICER City of Tracy <br /> Virginia Mathews City of Ripon <br /> Thomas Schubert,D.V.M. San Joaquin County <br /> Daphne Shaw City of Stockton <br /> Harvey Williams,Ph.D. San Joaquin County <br /> June 21 , 1989 <br /> PDM Strocal Inc . <br /> Attn : Fred Long , Plant Manager <br /> 2324 Navy Drive <br /> Stockton , CA 95206 <br /> RE: Soil Excavation Workplan ; 2324 Navy Drive , Stockton <br /> Please be advised that this office has reviewed the, above <br /> referenced workplan'. The following items should be addressed in <br /> a revised workplan or addendum to the existing workplan . <br /> 1 . Illustrate the previously constructed soil borings and <br /> monitoring wells on a detailed site map , and provide a brief <br /> summary of the work performed on the site to date . <br /> 2 . Provide scale-drawn cross-sectional diagrams of the <br /> excavation area. This will benefit in graphically <br /> illustrating the proposed sampling locations . <br /> 3 . The proposed rationale for sampl i ng the excavati on area for <br /> diesel constituents is acceptable only for the purpose of <br /> screening the removal area. Verification sampling is <br /> recommended using laboratory analyses EPA 8010/8020 ; 8015 <br /> TPH , Volatile ; 3550/8015 TPH , Extractable on those samples <br /> collected to define the " zero line" of vertical and lateral <br /> contamination migration . <br /> 4 . Dewatering activities proposed in order to facilitate deeper <br /> soils excavation is acceptable provided the following <br /> concerns are considered and addressed : <br /> a. Beta Associates [September 21 , 1987 , Project #195- <br /> 1 . 1 ] suggests an off-site contaminant plume in the <br /> vicinity of MW#1 . Prior to extraction of groundwater <br /> from the excavation area, water level measurements <br /> should be made and measurements continued throughout' <br /> the extraction process . <br />