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Earth Systems Environmental, Inc. A Member of The Earth Systems Group 4719 Quail Lakes Drive, Suite G-253 • Stockton, CA 95207 • (209) 957-5317 • FAX (209) 957-4887 �1tII� April 8, 1993 Job No.: 2-2 DocumeV?� :I4§0bJgMWPT Mr. Ron Palmquist City of Stockton ENVIRONMENTAL HEALTH Department of Housing and Economic Development PERMIT/SERVICES Housing Division 305 North El Dorado Street, Suite 200 Stockton,California 95202 SUBJECT: WORK PLAN FOR SUPPLEMENTAL ENVIRONMENTAL ASSESSMENT Proposed McKinley/French Camp Turnpike Project Stockton,California Dear Mr.Palmquist: Earth Systems Environmental,Inc. (ESE), is pleased to submit this work plan for a supplemental environmental assessment of the subject site in the City of Stockton, San Joaquin County, California (Figure 1). It addresses investigation methods, techniques, soil and groundwater sampling,and locations of exploratory borings and sample points. BACKGROUND A Phase I environmental supplement of the subject site, issued by ESE on December 28, 1992, identified areas of potential concern which would warrant a supplemental investigation. Two automobile wrecking yards are located adjacent to the site. Surface spills of motor oil and fuels are common occurrences at this type of facility. The site is comprised of four parcels, (Figure 2) one of which is occupied by a trucking facility with an underground diesel fuel storage tank. There is a potential for fuel to have leaked from the tank or associated piping,as well as for spills of waste oil or fuels at the surface. Three of the parcels are vacant and have a history of agricultural use. Chlorinated pesticides may have been used on these parcels,and some pesticide residue may persist in the soil. PURPOSE AND SCOPE The purpose of this reconnaissance-level investigation is to determine whether the soil or groundwater below the site may have been impacted by past use, storage,or handling of hazardous materials on or around the site vicinity. ESE proposes to drill exploratory borings along the property boundaries between the site and the two auto wrecking yards,and on the two sides of the underground diesel storage tank at the Thorsen Trucking yard. Approximate boring locations are shown on Figure 3. Soil samples collected during the drilling operations will be analyzed at a state-certified laboratory for the presence of selected contaminants. Three groundwater samples will also be collected from the shallow aquifer underlying the site with a HydroPunchTM sampling device. The water samples will be properly preserved for laboratory analysis.