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•��_� X #CNC. SACRAMENTO <br /> investigation report was submitted on behalf of Pacific Bell to <br /> SJEHD. <br /> The investigation identified the presence of up to 7, 100 <br /> milligrams per kilogram (mg/kg) of petroleum hydrocarbons as <br /> diesel at a depth of 30 feet below the surface. Benzene, <br /> toluene, ethylbenzene, and xylenes (BTEX) were also reported to <br /> be present. Benzene was identified at less than 1. 0 mg/kg and <br /> the other volatile compounds were in the range from below <br /> detection limits to six mg/kg. It is unknown if ground water, <br /> which is reported to be present at the site at a depth of greater <br /> than 60 feet below the surface, had been impacted. Figure 3 <br /> presents the location of the site investigation boreholes and the <br /> analytical laboratory results by location. <br /> Based upon the findings of the site assessment, Versar <br /> developed a remediation plan for the facility. The initial <br /> • remediation plan recommended the excavation and bioremediation of <br /> contaminated soil from beneath the former UST site. Subsequent <br /> feasibility studies of the proposed excavation at the site <br /> determined that the structural integrity of the building would be <br /> severely affected. It was also determined that the cost of <br /> shoring, required to protect the integrity of the building, <br /> presented a cost/benefit feasibility problem. Based on this <br /> data, a pilot study of soil-vapor extraction was proposed in an <br /> addendum to the original Versar workplan. The results of the <br /> pilot study are presented in this Interim Remediation/Pilot Study <br /> Report. <br /> 1. 2 InterimRemediation/Pilot Study Objectives <br /> The primary objective of the interim remediation/pilot study <br /> was to determine if soil-vapor extraction technology could be <br /> successfully utilized in the remediation of the diesel-impacted <br /> soils at the site. The general objectives were to: <br /> 2 <br />