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MAMK � y 4 j 1.0 INTRODUCTION/PREVIOUS WORK This report is being submitted in response to a request by the San Joaquin County Public Health Services Environmental Health on site as subs rface Chevrolet property at 423 he Chase uSsment North Madison et Division to perform aAvenue in Stockton (Figure 1). On May 14, 1986 hydrocarbon contamination of sails was noted ns during the removal of five undergroThe tanks were installedund tanks from two oin at the project sites (Figure 2) - 1965. All product lines were also removed during the original excavation work which was witnessed by a San Joaquin public Health Services representative. Laboratory analysis of soil samples collected beneath the tanks recorded elevated concentra- tions of hydrocarbon constituents. Due to the elevaresence of teundwatocar- bon concentrations in the furtherl and hinvestigation was warranted. er at a reported depth of 20 feett,, A workplan/preliminary report dated August 1, 1 89,(Frwas c Browne& in response to a request by Mr. Gerry Sperry Sperry), attorneys for Chase Chevrolet, Stockton. This report summarizes the results of the investigation outlined in the workplan and presents recommendations for further actions. 2.0 BACKGROUND TECHNICAL DATA 2.1 Name and address of site, tank owner and contact person: Site: Chase Chevrolet 423 North Madison Avenue Stockton, CA Site Owner: Auto Investments 2431 March Lane Stockton, CA Contact Person: Gerry Sperry Freeman, Brown & Sperry 1818 Grand Canal Blvd. Stockton, CA 95207 2.2 Map showing site location relative to nearby landmarks: The site location is shown on Figure 1. 2.3 Layout of all above ground (a/g) and underground (u/g) tanks and piping systems properly labeled for content: The former tank locations are shown on Figure 2. 1