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Tri-Valley Growers November 9, 1987 <br /> Project No. 1582G Page 6- 1 <br /> SECTION 6.0 <br /> DISCUSSION <br /> — At the time of the original excavation (January and February, 1987) to <br /> remove four underground storage tanks, hydrocarbons contamination was <br /> detected in the areas of tanks T2, T3, T4 and T5. Tables 1 and 2 of this <br /> report show petroleum hydrocarbon contamination near the tanks located <br /> near the forklift shop. These laboratory results indicate that concentrations <br /> of benzene in soil from the above mentioned areas ranged from 120 ppb at T3 <br /> #1 to 1,700 ppb at T2 #2. Toluene concentrations in soil ranged from 11,000 <br /> ppb at T3 #1 to 2,900 ppb at T4 #1. Xylene concentrations ranged from <br /> 15,000 ppb at T4 #1 to 33,000 ppb at T3 #1. Diesel concentrations were <br /> detected at 65 ppm in T4 #1 and 330 ppm in T5 #1. Total lead <br /> concentrations ranged from 1.5 ppm at T1 #1 to 8.9 ppm at T2 #2. <br /> .,: <br /> ,.. On August 20 and 21, 1987, Exceltech installed three groundwater <br /> monitoring wells near the forklift shop. The purpose of the monitoring wells <br /> was to further delineate the extent of subsurface contamination. A review <br /> of the chemical data from these wells indicates no hydrocarbon <br /> contamination was detected within the three monitoring wells. Soil and <br /> water samples all tested below the detection limit (BDL) for TVH, BTX, and <br /> total hydrocarbons as diesel. Total lead concentrations were detected in soil <br /> and water samples taken. The concentration for lead in soil ranged from 3.4 <br /> ppm at MW-2 to 5.4 at MW-3 and MW 1. Total lead results for water ranged <br />