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r � <br /> 1013 Shaw Road, Stockton,CA (' 3 August 30, 140 <br /> HECOI[IIIENDATIONS <br /> In order to evaluate the potential impact of leaving the existing soil in-place under the <br /> former underground tanks, a Leaching Potential Analysis as prescribed in the LUFT manual <br /> t, -c�°• <br /> was conducted. The information necessary to perform the Leaching Potential Analysis was <br /> first obtained. <br /> The depth to groundwater at the site was obtained from existing records of groundwater <br /> depths available from the San Joaquin County, Department of Public Works, Flood Control <br /> Division as approximately 75 feet. The average annual precipitation in Stockton was obtained <br /> from the National Weather Service as 14.0 inches. There are no fractures in the subsurface, <br /> man-made vertical conduits,or unique site features such as coarse soil (sand or gravel). Since <br /> Il the groundwater table is greater than five feet below the former bottom of the underground <br /> tanks and no evidence of significant soil contamination was found, the subject site can be <br /> classified in Category 1 of the LUFT manual. <br /> g <br /> Using the inputs described above, the.Leaching Potential Analysis was conducted and <br /> resulted in a total score of 48 points. The LUFT manual states that sites with scores ranging <br /> from 41 to 48 points can leave existing soil in-place if the following contaminant levels are not <br /> exceeded: <br /> B.T.X&E _ 0.3.0.3.1.0.1.0;Ppm. respectively <br /> TPH 100 ppa <br /> The subject site currently has BT%&E as non-detectable at minimum detection limits and <br /> one sample detected as having TPH of 15 ppm and the other non-detectable. Therefore, the <br /> present contaminant levels are far less than the maximum levels as recommended in the LUFT <br /> manual. Furthermore, there are no anticipated risks to resources other than groundwater. <br /> Therefore, in accordance with LUFT manual procedures and recommendations, no remedial <br /> action is necessary and the site soil can be left in-place. However, ultimate jurisdiction <br /> regarding the site status rests with the Lead Regulatory Agency, in this case the San Joaquin <br /> County Public Health Services. <br />