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Excluding the three samples analyzed by Argon in the area of impact the equivalent confidence <br /> intervals are: <br /> Total Lead: 45.24 5 µ L 78.76 ppm <br /> Soluble Lead:1.71 5 µ S 5.79 ppm <br /> In either event the total lead concentrations within the impacted arra do not exceed the Cal EPA <br /> Modified Residential PRG of 130 ppm. Accordingly,no significant risk to human health or the <br /> environment is posed by the impacted soil. <br /> 7.0 REMEDIAL ACTION GOAIS <br /> The goals of the remedial action are to: <br /> • Prevent human exposure to any soil with concentrations of contaminants that might <br /> be expected to pose a significant health risk. <br /> • Prevent groundwater degradation by the leaching of any contaminants that have the <br /> solubility and mobility to impact groundwater. <br /> • Comply with applicable laws and regulations and the Judgement of the Court. <br /> 3.0 EVALUATION OF REMEDIAL ALTERNATIVES <br /> In Ground Zero's report Swnmary of Soil Contamination Investigatiow and Soil Remediation <br /> Plan (11/21/47) several remedial alternatives were evaluated. In the development of <br /> recommendations for remedial action,four options were considered:No Action,Site Capping <br /> (Paving), Insitu Treatment of Soil, and Soil Excavation. These were evaluated for <br /> protectiveness,implementability,and cost. <br /> 9.0 RECOMMENDED ALTERNATIVE <br /> Raced on the site conditions,property use,lack of health threat and lack of threat to groundwater <br /> Ground Zero recommended adopting either the No Accton or the Capping Option. This <br /> recommendation was presented in the report S"mmory of Soil Contamination Investigations and <br /> Soil Remediation Plan dated November 21, 1997. <br /> The investigations completed to date have shown that the volume of soil affected by elevated <br /> lead concentrations is not laterally nor vertically extensive and concentrations are erratically <br /> distributed. The concentrations present are not significant in terms of potential health risks. <br /> There is no indication that the affected soil poses a threat to groundwater. From the perspective <br /> �Td Wt+Li:aT 866T 11 i £886 8£8 6a-, : 'ON 3:JcHd STSFIeUU o�2Z punw8 t.gyj <br />