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3 <br /> Chevron/S. El Dorado 19 <br /> August 1990 <br /> TABLE 4 <br /> GROUNDWATER ANALYTICAL RESULTS <br /> parts per billion (ppb) <br /> TOTAL <br /> WELL ETHYL- TPH-AS- OIL-AND- ' <br /> I.D. BENZENE TOLUENE BENZENE XYLENESIGASOLINE GREASE <br /> MW_11 0.5 <0.3 <0.3 <0.6 810 1 <br /> MW-2 <0.3 <0.3 <0.3 <0.6 <50 NA <br /> �. MW-3 890 9 68 14 1 ,500 NA <br /> NA = Not Analyzed <br /> 77 <br /> 5U-rQiARY <br /> In order to remove remaining gasoline hydrocarbons from the <br /> subsurface soils, an excavation was performed in the location of <br /> the former underground product-storage tank, waste-oil tank, and <br /> pump islands. Analytical results for soil samples collected from <br /> the base of the former product-storage tank pit excavation <br /> reported up to 3,400 ppm TPH-as-gasoline. Soil samples analyzed I <br /> - from the former waste-oil tank and pump island locations were <br /> p <br /> below laboratory MDL. The excavation of the former product- <br /> storage <br /> .. <br /> storage tank pit was halted at a depth of approximately 20-feet <br /> below grade, due to equipment limitations. <br /> Under permit from the San Joaquin County Air Pollution <br /> Control District, the excavated soil was stockpiled on site and <br /> aerated. Once the concentrations of TPH-as-gasoline in the soil <br /> had been reduced to below 1 ppm, it was authorized for use as <br /> backfill material by the SJCHSD. The excavations were backfilled <br /> --- ---=- to-grade--using- <br /> imp= the--aerated n-1-clean soil,-arid-clean— - ------�-- -- <br /> ted soil, and were compacted to meet City of Stockton <br /> building codes. <br /> wd <br /> VF GROUNDWATER <br /> TECHNOLOGY.INC. <br /> y - <br />