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1 <br /> City of Stockton A68104 01A <br /> October 25, 1995 Page 5 <br /> TABLE 1 <br /> Preparation and Analytical Methods <br /> Detection Ljmtt for <br /> Type of Analysts Preparation Method Analytual Method Reporting Purposes <br />' Sod Sample Analyses <br /> Benzene,Toluene,Fsthylbenzene, and 50301 80201 <br />' Xylenes 0 005 mg/kg <br /> Total Petroleum Hydrocarbons-Gasoline 5030 GC/FID2 10 mg/kg <br /> Range <br /> Groundwater Sample Analyses <br /> Benzene Toluene,Ethylbenzene, and 6023 602 OS jug/L <br /> Xylenes <br /> Total Petroleum Hydrocarbons-Gasoline 5030 GC/FID 50 pg/L <br /> Range <br />' GC/FID = Gas Chromatography/Flame Ionization Detection <br /> mg/kg = milligrams per kilogram <br /> dig/L = micrograms per liter <br /> I United States Environmental Protection Agency(US EPA) 1983 <br /> 2 California State of, Leaking Underground Fuel Tank Task Force, October 1989 <br /> 3 US EPA, 1982 <br /> Twining is a California Department of Health Services certified hazardous waste laboratory <br />' (Certificate No 1371) for the analyses outlined herein A description of laboratory quality <br /> assurance/quality control procedures used in this assessment are described in the SOPs <br />' presented in Appendix A <br />' 5.0 RESULTS AND FINDINGS <br /> Results of the field Investigation and laboratory testing are summarized in the following <br /> subsections <br /> 5.1 Soil Profile The following is a general summary of the subsurface conditions <br />' encountered in the soil borings drilled for this investigation The soil profile beneath the <br /> site consists of interbedded strata of silty sand with clay, sand with clay, clayey sand, and <br /> well graded sand to 40 feet BSG, the greatest depth explored Descriptions of the <br /> conditions encountered in the soil borings are presented in the logs of soil borings in <br /> Appendix B Stratification lines on the soil boring logs represent approximate boundaries <br />