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REVISED SITE ASSESSMENT SUMMARY REPORT March 1996 Calkins Trucking 19501 North Highway 99 Acampo, California 1.0. INTRODUCTION/SCOPE OF WORK In accordance with the request of Mr. Les Calkins, Advanced GeoEnvironmental, Inc. (AGE) has prepared this Revised Site Assessment Summary Report for 19501 North Highway 99, Acampo, California(the site). The report summarizes excavation and soil sampling procedures performed at the site from 1993 to 1995 and presents the available results of laboratory analyses. The location of the site is illustrated in Figure 1 - Location Map. A plan of the site is illustrated in Figure 2 - Site Plan. This report is prepared in accordance with a directive from the San Joaquin County Public Health Services-Environmental Health Division(PHS-EHD)presented in a letter dated 14 November 1995, 2.0. BACKGROUND . 2.1. SITE LOCATION/BACKGROUND The site area is located in an agricultural area of low topographic relief south of Acampo, California, near the intersection of Highway 99 and Woodbridge Road. In 1957,three underground storage tanks (USTs)were installed at the site; two 10,000-gallon diesel USTs and a 550-gallon gasoline UST. 2.2. UNDERGROUND STORAGE TANK REMOVALS On 20 December 1991, the three USTs were removed from the site by Claude C. Wood, Co. of Lodi, California. Underground Tank Closure/Abandonment Inspection reports on file with the PHS-EHD indicate that all tanks and piping were in poor conditions upon removal. Additionally,-surface water had collected in the excavation during the UST removal. After removal of the USTs, FGL Environmental of Stockton, California, collected soil and grab water samples from the site: four soil samples were collected from stockpiled soil; one grab water sample was collected from the excavation. Total petroleum hydrocarbons quantified as diesel (TPH-d) and volatile aromatics (benzene, toluene, ethyl benzene and xylenes: BTE&X� were detected in the stockpile soil samples at concentrations as high as 1,460 mg/kg (milligrams per kilogram, equivalent to parts per million: ppm). TPH-d and xylenes were detected in the grab water sample at concentrations of 10,300 and 0.63 ppm, respectively. Analytical results are summarized on Table 1. • Copies of the laboratory report are included in Appendix A.