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INTERIM PROBLEM ASSESSMENT REPORT SOIL REMEDIATION WORKPLAN FOR TRACY JOINT UNION HIGH SCHOOL DISTRICT 315 E. ELEVENTH STREET TRACY, CALIFORNIA 1.0 INTRODUCTION At the request of Tracy Joint Union High School District (TJUHSD), RESNA Industries Inc i (RESNA) conducted a subsurface environmental investigation at the former Tracy High School Bus Facility, 315 East Eleventh Street, Tracy, California Work for the investigation included drilling nine soil borings, collecting soil and water samples from the borings, and analyzing the samples for petroleum hydrocarbon constituents The purpose of this investigation was to further delineate the lateral and vertical extent of suspected petroleum hydrocarbons observed at the site during the removal of two underground storage tanks (USTs) The site location is idepicted on Figure 1 2.0 BACKGROUND On September 16, 1987 one 1,000-gallon gasoline underground storage tank was removed at the site by Precision Industries (PI) of Stockton, California During removal activities gasoline contamination was noted in the open excavation Analyses of a water sample collected from within the tank pit confirmed the presence of petroleum hydrocarbons ' A (formerly WaterWork advanced three soil On January 4, 19$8 on behalf of THS, RESN ( o y ) bonngs in the vicinity of the former gasoline UST to depths between 25 and 28 feet below grade These soil borings were subsequently completed as 2-inch monitoring wells T1, T2 and T3 Well locations are shown on the Site Plan, Figure 2 Soil samples collected from the borings did not contain detectable concentrations of petroleum hydrocarbon analytes (Table 1) ' Analysis of initial water samples collected from the three monitoring wells on January 7, 1988 IPdetected benzene in wells T1 and T3 at concentrations of 0 907 parts per billion (ppb) and 0 532 1500871R 0531%FNL 1