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i— 1.0 INTRODUCTION This report is being submitting on behalf of Mrs. C. M. Weber to prevent a summary of the soil contamination assessment at the facility la;ated at 141 North E1 Dorado Street in Stockton, California (Figure 1) and to propose remediation of soils on the site which have been impacted by petroleum hydrocarbons. The report r _ paovides background information, summarizes results of recent investigations, presents an evaluation of remedial alternatives, .and outliines a proposed remedial action plan for the impacted soils. 2.0 BITE BACKGROMIM In 1955, Shell oil Company constructed a retail gasoline and service facility at 141 Nerth E1 Dorado Street in Stockton (Figure 2) . This construction included the installation of four 4,000-gallon steel underground product rto�:age tanks for the containment of leaded gasoline. One 500-gallon underground storage tank containing used- oil was also located on the property. In 1962, one of the leaded tanks was removed and two 7,500-gallon underground storage tanks were installed to store unleaded gasoline. The station discontinued selling gasoline in 1981 and five of the product storage tanks were removed. No soil samples were collected and analyzed at the time of the tank removal. Following removal of the storage tanks, the tank pit excavation was backfilled and repaved. The used-oil tank remained on site and was in use until June of ,1990. s-° 3.0 BIDT+OGEOLOGIC SETTING r; The site lies in the eastern portion of the Sacramento - San Joaquin Palta. The subsurface geology in the Stockton area is characterized r.. by Pleistocene and Recent alluvial deposits. These alluvial deposits consist of heterogeneous sequences of sands and gravels originating from active stream channels; and silts and clays originating from overbank and marsh depo::itional environments. w.bar Point prcparty - 47. 1