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■VZ1 INC <br /> The depth to groundwater at the Hi Hopes property is approximately 35 feet below the <br /> • base of the remaining hydrocarbon impacted soil left in lace Table 2-1 of <br /> P p the State of <br /> California Water Resources Control Board and Department of Health Services Leaking <br /> Underground Fuel Tank (LUFT) Field Manual Guidelines for Site Assessment, Cleanup, <br /> and Underground Storage Tank Closure, 1989 manual allows the establishment of soil <br /> leaching conditions for gasoline and its fuel components This table was utilized as a <br /> methodology to establish concentrations of gasoline fuel and its components that could <br /> be left in place without impacting groundwater The table can apply to the hydrocarbon <br /> impacted soil left in place in the subsurface because of the small volume of material and <br /> the very low concentration levels <br /> According to this analysis, the maximum levels of benzene, toluene, ethyl benzene, and <br /> xylene that can be left in the subsurface are 0 3, 0 3, 1, and 1 mg/kg, respectively Total <br /> petroleum hydrocarbon as gasoline fuel concentrations in soil that may be left in place are <br /> 100 mg/kg Concentrations of hydrocarbon impacted soil left in place on the Hi Hopes <br /> property are below the recommended action levels according to the leaching potential <br /> analysis for all the gasoline components and total petroleum hydrocarbons as gasoline <br /> WZI concludes that local groundwater under the Hi Hopes site is not threatened by any <br /> of the remaining gasoline impacted soil left in place in the subsurface Based on historical <br /> data developed during the investigation and ratios of benzene to xylene and benzene to <br /> total petroleum hydrocarbon as gasoline fuel concentrations, the spill appears to be very <br /> old Overtime, natural bioremediation processes will further degrade the gasoline fuel and <br /> its components that remain in the subsurface The site is planned to be developed as a <br /> commercial property with a warehouse building and paved parking area in the near future <br /> The former tank location site will be completely covered at the surface which will prevent <br /> downward migration of storm water <br /> 08220010 011 5 <br />