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1 <br /> Monta Brothers Service Station 6 July 16, 1992 <br /> 1 <br /> M: . <br /> ' Table 2 presents a summary of the analytical results for TPH as gasoline and diesel, <br /> the fuel constituent volatile aromatics, EDB, PCBs, and total lead in the soil sample <br /> from beneath the waste oil tank <br /> TABLE 2 Analytical Results expressed in milligrams per kilogram <br /> ' Sample Depth TPH TPH TPH Volatile IDB PCBs Total <br /> Gas�ng Diesel G&G Aromatics Lead <br /> ' TK-4 9' ND ND 1 400 0 ' ND I ND ND 1 '25 0 <br /> AL NA 10 100 100 NA 1 002 1 ND 15110001 <br />' ND None Detected at or above minimum reporting level. <br /> NA Not Applicable <br /> r exceeds current recommended guidelines <br /> A L Regional Water Quality Control Board recommended guidelines for contaminants in soil The <br /> recommended guidelines were calculated using the LUFT methodology by multiplying the most <br /> stringent current federal or state water quality standards by a factor of 100 to account for <br /> attenuation due to soil composition and distance from groundwater <br /> Based on the soil sampling and analysts, concentrations of TPH as gasoline and the <br />' gasoline constituent volatile aromatics present in the soils at the site exceed current <br /> recommended guidelines Additional site characterization was required by the San <br />' Joaquin County Department of Environmental Health Services in the vicinity of the <br /> north end of the gasoline product pipelines, and beneath the former 5,000 gallon <br />' underground unleaded gasoline storage tank ESE was retained by Crisp Construction <br /> to perform the site characterization Below are the results of the site <br /> characterization <br /> A total of seven soil borings were drilled within this phase of soil characterization <br />' (Figure 2) A soil boring (TH-1) was advanced through the northern end of the <br /> former eastern 5,000 gallon gasoline tank excavation and slant drilled at 200 from <br />' vertical to the south with a bottom hole location beneath the center of the tank to <br /> assess the vertical extent of impacted soil beneath this probable source Four soil <br />' borings (TH-3 through TH-6) were positioned to assess the lateral extent of gasoline <br /> concentrations in the soil A soil boring (TH-2) was advanced adjacent to the former <br /> location of the product pipeline adjacent to the northern dispenser island due to the <br /> overhanging canopy, and slant drilled at 200 from vertical to the east with a bottom <br />' E13-8101-3 9207-E037.WP <br />■ <br />