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Preliminary Site Assessment Work Plan ALLIANCE GAS STATION 8750 South El Dorado Street, French Camp, California 1.0. INTRODUCTION At the request of Mr. Philip Lehrman, Advanced GeoEnvironmental, Inc. (AGE) has prepared Preliminary Site Assessment Work Plan for the property at 8750 South El Dorado Street, French Camp,California(the site).The location of the site is illustrated on Figure 1.A plan view of the site is illustrated on Figure 2. This work plan is prepared as required by the San Joaquin County Public Health Services - Environmental Health Division(PHS-EHD)by letter dated 18 July 2001 to investigate unauthorized releases associated with underground storage tanks(USTs)on the site.This work plan was prepared in accordance with Appendix A to Tri-Regional Recommendations - Reporting, dated 30 August 1991, issued by the Central Valley Regional Water Quality Control Board(CVRWQCB). This work plan provides a description of the scope of work and procedures to be used in soil probe borings, soil and groundwater sample collection and analysis and soil boring abandonment. 2.0. BACKGROUND The site is located on the southeast corner of Lynn Avenue and South El Dorado Street in an industrial/agricultural area of French Camp, California(Figure 2). The site operated as a fuel and service station from approximately 1963 to approximately 1985.The site.has been vacant since 1985 and a one-story building is the only remaining structure on the site. 2.1. UNDERGROUND STORAGE TANK REMOVAL On 29 August 1989,one 10,000-gallon diesel UST(TAI),two 5,000-gallon(TA2 and TA3)and one 3,000-gallon(TA4)fuel USTs and one 250-gallon waste oil(TA5)UST were removed from the site by Al Williamson.Product lines were also removed during excavation of the USTs.The approximate location of the former USTs is shown on Figure 2. During the UST removals, two soil samples each were collected from the base of the excavations of the fuel and diesel USTs, one soil sample was collected from the base of the excavation of the waste oil UST and six soil samples were collected between 2.5 feet and 5 feet below surface grade (bsg) beneath the product lines. Total extractable petroleum hydrocarbons were reported in one of the soil samples collected beneath the 10,000-gallon diesel UST,the soil sample collected beneath the waste oil UST and from sample T5=3 collected beneath the product lines at concentrations as high as 76 milligrams per kilogram (mg/kg). Toluene was detected in one soil sample collected beneath each fuel UST (TAI, TA2, TA3 and TA4) at concentrations as high as 0.005 mg/kg. Advanced GeoEnvironmental,Inc.