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Based on the statistical analysis, the soil, if treated as a whole and sampled on a composite basis <br /> from stockpiles generated during construction activities,may not be considered a hazardous <br /> waste. However, if management of the soil within the variance is required based on soluble lead <br /> concentrations, the statistical data indicate that the soil may be able to be handled within <br /> condition 1 of the variance. This condition requires that the soil be used as fill beneath at least <br /> one foot of clean (non-hazardous) soil fill and five feet above the water table. This conclusion is <br /> based on the calculated 90%UCLs for total lead and DI WET data within the 0 to 0.6 meter(0 to <br /> 2 foot) data set. <br /> Soil samples were reported to contain total petroleum hydrocarbons as diesel, total petroleum <br /> hydrocarbons as motor oil, and organic lead. The reported organic lead concentration exceeds <br /> the U.S. Environmental Protection Agency, Region 9,residential soil Preliminary Remediation <br /> Goal. A groundwater grab sample was reported to contain weathered total petroleum <br /> hydrocarbons as gasoline, benzene, toluene, ethylbenzene, and xylenes. All reported <br /> concentrations were below drinking water Maximum Contaminant Levels. The soil and <br /> groundwater data are interpreted to indicate that a release of motor vehicle fuels may have <br /> occurred on the parcel at the southwest corner of the intersection. Further investigation should <br /> be conducted on that parcel and within Caltrans right of way to investigate impacts from the <br /> interpreted release. <br /> SrtcDP-N:IrancjpllProjectsl8218217641ReponU20 Aastm report.doc ES-2 <br /> 5121101 <br />