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Morita Brothers Service Station 6 January 23, 1992 <br />Table 2 presents a summary of the analytical results for TPH as gasoline and <br />diesel, the fuel constituent volatile aromatics, EDB, PCBs, and total lead in the soil <br />sample from beneath the waste oil tank: <br />TABLE 1. Analytical Results expressed in milligrams per kilogram. <br />Sample Depth TPH I <br />TPH <br />TPH <br />Volatile EDB <br />Bs Totat <br />olive <br />i el <br />O&G <br />Aromatics <br />Lead <br />TK -4 9ND <br />ND <br />40.0 <br />ND Z ND <br />ND 25.0 <br />AL NA 10 <br />100 <br />100 <br />NA 1 0.02 <br />ND 5/1000 <br />ND: None Detected at or above minimum reporting level. <br />NA: Not Applicable. <br />*: 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 />7.0 CONCLUSIONS <br />Based on the soil sampling and analysis, concentrations of TPH as gasoline and <br />the gasoline constituent volatile aromatics present in the soils at the site exceed <br />current recommended guidelines. Additional site characterization is likely to be <br />required by the San Joaquin County Department of Environmental Health Services in <br />the vicinity of the north end of the product pipelines, and beneath the former 5,000 <br />r' <br />gallon underground unleaded gasoline storage tank. <br />8.0 CLOSURE <br />This report has been prepared for the exclusive use of Crisp Construction <br />Company, and Morita Brothers as it pertains to the referenced property in Stockton, <br />California. The findings and conclusions rendered in this report are opinions based <br />on laboratory testing of the soil samples collected during this project. This report <br />does not reflect subsurface variations which may -exist between sampling points. <br />These variations cannot be anticipated nor can they be entirely accounted for even <br />with exhaustive additional testing. All work has been performed in accordance with <br />generally accepted practices in geotechnical/environmental engineering, <br />EB -8101-1 9201-E081.RPT <br />