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Harding Lawson Assoc,2tes <br /> III € <br /> VI RESULTS <br /> Table �2` summarizes the results of soil sample analyses to' date.'` TPH con- <br /> centrations above 100 ppm were found to extend across an area northeast of the <br /> I <br /> �. <br /> tank s. Concentrations in excess of 1000 ppm were found at P-A, MW-1, and <br /> } P-4. Concentrations between 100 ppm and 1000 ppm were noted at P-B and MW-8, <br /> r <br /> while concentrations below 100 ppm were noted at MW-5 and P-6. Plate 13 shows <br /> I� the areas of the site where detectible TPN concentrations in the soils have <br /> M been identified. <br /> Results of analyses on ground-water grab samples from exploratory borings <br /> are presented in Table 3; those from analyses on water samples from monitoring <br /> wells are presented in Table 4. Ground-water grab samples collected from P-2, <br /> P-3, P-41 P-6, and P-7 indicate the presence of gasoline constituents across <br /> an area northeast of the underground tank (Table 3 and Plate 14). <br /> Ground-water samples obtained fromthe monitoring wells confirmed the <br /> presence of the gasoline constituents identified in borings P-2, P-3, P-�41(13 <br /> I. <br /> j <br /> P-6, and P-7. The highest concentrations were noted in MW-7, with generally . <br /> decreasing concentrations in MW-B and MW-1 (Table 4 and Plate 14). <br /> #_ The Central.,Valley RWQCB generally requires ground-water remediation if <br /> concentrations of organic chemicals in the ground water exceed the Drinking <br /> ( , Water Action Levels (DWAL) of the State of California Department of Health <br /> �� exvices {D(MS)._- <br /> 'The DWAL-for BTXE are presented in Table 5. . <br /> rj _ <br />