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SECTION 5 <br /> CONCLUSIONS <br /> ' Soil and groundwater samples were collected and analyzed, and a <br /> total of four groundwater monitoring wells (MW-1A through MW-4A) <br /> were installed at former tank site #2, located at 1325 West Weber <br /> ' Avenue, Stockton, California Petroleum products were found in soil <br /> and groundwater beneath and in the vicinity of this tank site. The <br /> petroleum products consist of gasoline (most likely unleaded) and <br /> ' BTEX compounds The distribution of these compounds in the soil <br /> and groundwater is discussed below <br /> Stu1 <br /> ' Based on the data obtained during this investigation, it appears that <br /> the maximum depth of hydrocarbon affected soil at the site is <br /> approximately 10 feet below the ground surface The volume of soils <br /> containing TPH as gasoline in excess of 100 ppm at the former tank <br /> site #2 is estimated to be approximately 400 cubic yards <br />' TPH as gasoline was detected in 3 of 8 soil samples The maximum <br /> concentration of TPH as gasoline was measured at 1,200 ppm in the <br /> vicinity of MW-3A No TPH as gasoline was detected in soils at MW- <br /> 2A and MW4A <br /> BTEX compounds were detected in 4 of 8 soil samples The <br /> maximum measured concentrations of BTEX compounds in soil <br /> were the following benzene (31 ppm), toluene (31 ppm), <br /> ethylbenzenes (24 ppm); and xylenes (83 ppm) Soils around each of <br /> the monitoring wells except for MW-4A contained detectable <br />' quantities of BTEX However, in soils at MW-2A, BTEX was <br /> measured in low concentrations (less than 20 ppb) <br />' TPH as diesel was detected in soil only in the vicinity of MW-1A The <br /> maximum concentration of TPH as diesel measured in soil was 180 <br /> ppm <br />' No gasoline, diesel or related petroleum constituents were detected in <br /> the soils from the boring inside the warehouse building (MW-4A) <br /> 5-1 <br />