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1 . <br /> GRANITE CONSTRUCTION <br /> WKA No 2088 07 <br /> April 7, 1995 <br /> Page 3 <br /> 1 <br />' per kilogram (mg/kg) to 10 mg/kg and TPH as gasoline concentrations ranging from 270 mg/kg <br /> to 5,900 mg/kg <br />' Analysis of samples obtained beneath the former UST product lines revealed no detectable <br /> concentrations of TPH as motor oil or diesel One sample obtained from beneath the product <br /> lines revealed a trace concentration of TPH as gasoline Sample P4, obtained from beneath the <br /> former dispenser island, revealed a TPH as gasoline concentration of 1.30 mg/kg and a TPH as <br />' diesel concentration of 15,000 mg/kg at a depth of six feet below site grade <br />' A detailed discussion of the laboratory results and observations during UST removals is contained <br /> in our Soils Sampling and Testing report, dated May 12, 1992, on file with San Joaquin County <br /> Public Health Services - Environmental Health Division (EHD) <br /> Based on analysis of soil samples obtained during removal of the USTs, a Site Contamination <br /> Workplan dated January 28, 1993, was submitted to delineate the lateral and vertical extent of <br /> soil and ground water contamination in the vicinity of the former diesel and unleaded gasoline <br /> USTs Additionally, excavation was proposed to remove trace concentrations of motor oil <br /> contamination from beneath the former waste oil tank <br /> In accordance with the Site Contamination Workplan, seventeen soil borings (B1 through B17) <br />' and three monitoring wells (MWI through MW3) were drilled and sampled at three locations, <br /> former waste oil UST, former dispenser island, and the former gasoline and diesel USTs Two <br />' soil borings (131 and 132) were drilled at an approximate 30° angle from vertical to evaluate soils <br /> beneath the former waste oil tank (site conditions prevented the excavation and removal of the <br /> remaining motor oil contamination) Laboratory results of soil samples obtained from the two <br />' angle borings (B1 and 132) indicated that the soils beneath the former waste oil UST located <br /> adjacent to the easterly side of the shop building did not contain significant concentrations of <br />' petroleum hydrocarbons, nor did the soil samples contain elevated concentrations of the waste oil <br /> metals, cadmium, chromium, lead, zinc, and nickel <br /> INK <br />' WALLACE KUHL <br /> Recyded paper $ASSOCIATES INC <br />