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Excluding the three samples analyzed by Argon in the area of impact the equivalent confidence intervals are: Total Lead: 45.24 :!5; <_ 78.76 ppm Soluble Lead:1.71 _< It S 5.79 ppm In either event the total lead concentrations within the impacted area do not exceed the Cal EPA Modified Residential PRG of 130 ppm. Accordingly, no significant risk to human health or the environment is posed by the impacted soil. 7.0 REMEDIAL ACTION GOALS The goals of the remedial action are to: • Prevent human exposure to any soil with concentrations of contaminants that might be expected to pose a significant health risk. • Prevent groundwater degradation by the leaching of any contaminants that have the solubility and mobility to impact groundwater. • Comply with applicable laws and regulations and the Judgement of the Court. 8.0 EVALUATION OF REMEDIAL ALTERNATIVES In Ground Zero's report Summary of Soil Contamination Investigations and Soil Remediation Plan (11/21/97) several remedial alternatives were evaluated. In the development of recommendations for remedial action, four options were considered: no action, paving, insitu treatment of soil, and soil excavation. These are discussed below. 8.1 No Action There would be no further work with this option. Insofar as the lead concentrations at the site do not exceed the PRG level, no significant health threat would be expected to result from this option. The lack of elevated lead concentrations in samples collected below 1.5 feet and the low solubility of the lead in water indicates that the lead is immobile and does not pose a threat to groundwater quality by leaching. The estimated cost of this option was $0. 8.2 Paving This option would involve paving the area from the northeastern portion of the property east of the line established by samples SS-2 and SS-3 southward along the eastern edge of the existing building to the vicinity of soil sample CC, or approximately 2,300 fe. MY$\reports\raw.Tt 8