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Mee&q Regarding Former CaWwrda Fud• r <br /> 838 Mokelumne Street,Woodbridge,Cal f`� J <br /> 2. Six additional soil borings are to be drilled on site for the purpose of collecting soil <br /> samples for laboratory analysis of petroleum hydrocarbons. Three of the borings <br /> are to be drilled near the southern property line, near the southwest corner, and <br /> three borings are to be drilled within the limits of the former excavation. The <br /> borings will be properly abandoned following collection of the soil samples. <br /> The latter three borings are to be targeted to penetrate, as nearly as possible, the <br /> locations of residual diesel hydrocarbons as indicated by soil sampling following <br /> the excavation (please refer to the enclosed figure). All six borings are to be <br /> drilled to a maximum depth of 32 feet below surface; 2 feet below the maximum <br /> depth of the former excavation. <br /> 3. The borings are to be sampled at 5-foot intervals, beginning 10 feet below the <br /> existing ground surface, to account for the 5 feet of fill imported to raise the level <br /> of the site. <br /> 4. The collected soil samples are to be analyzed, by a state-certified laboratory, for <br /> total petroleum hydrocarbons, as diesel, by CAM-WET (waste extraction test) <br /> method(s). In addition, selected samples will be analyzed by an appropriate <br /> laboratory for petrophysical properties, including vertical permeability and porosity. <br /> 5. A results report of the findings from the soil borings and laboratory analysis will be <br /> prepared and issued. The report is to include a discussion of the site's <br /> hydrogeologic and other environmental characteristics, including soil moisture and <br /> evapo-transpiration data, in support of the argument for site closure. <br /> We appreciate the interest of the CVRWQCB in this matter. Please call me directly, as <br /> soon as possible, at (916) 782-2110 if you have any questions or concerns regarding the <br /> above understandings. <br /> Sincerely, <br /> AEGIS ENVIRONMENTAL, INC. <br /> J, ,,-- ..� <br /> Douglas I. Sheeks <br /> Senior Geologist <br /> CRG No. 5211 <br /> DIS/law <br /> Attachment <br /> cc: D. Atwater, California Fuels <br /> R. Valinoti, San Joaquin County Public Health Services <br /> 89-031 Y.LTR <br />