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TABLE 1 <br /> Analytical Results of Soil Samples <br /> Rotor Blades <br /> mg/kg <br /> Sample TPH as TPH as Ethyl- <br /> ID Gasoline Diesel Benzene Toluene benzene Xylenes <br /> B1-15 ND ND ND ND ND ND <br /> W1-9 ND ND ND ND ND ND <br /> 51-11 1.1 ND ND ND ND ND <br /> SP-1,2 ND ND ND ND ND 0.029 <br /> m&lkg = parts per mfflwn.ppm <br /> 5.0 CONCLUSIONS & RECOMMENDATIONS <br /> 5.1 Hydrocarbon Impacted Soil <br /> Soil samples collected from the excavation indicate that a very low concentration of gasoline <br /> (1.1 ppm) remains along the southern sidewall of the excavation at a depth of 11 feet. No <br /> petroleum hydrocarbons were detected in the sample from the floor of the excavation (15 <br /> feet). <br /> Soil was excavated to within two feet of the southern property line at the site. Additional <br /> excavation in this area is not feasible. Furthermore, since groundwater depth is estimated <br /> at 60 feet at the site, it is unlikely that the remaining soil along the southern property line <br /> poses a threat to groundwater. <br /> 5.2 Stockpiled Soil <br /> We recommend that the stockpiled soil be used to backfill the excavation. The excavation <br /> should be backfilled and compacted according to San Joaquin County guidelines. <br /> Very low concentrations of xylenes were detected in the stockpiled soil. Since depth to <br /> groundwater is in excess of 40 feet below the floor of the excavation, it is unlikely that the <br /> impacted soil would have any adverse impact on groundwater quality. <br /> 53 Site Closure <br /> After the excavation has been properly backfilled, we recommend that the site be certified <br /> for closure. <br /> d.I.SW A"t S.Mi I- <br /> 5 <br /> Rohr B66.4911955 <br />