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a significant risk to current Site occupants due to the default attenuation factor of 0.03 being overly <br /> conservative for risk evaluations of soil gas concentration in the State of California. <br /> None of the detected OCPs in the collected surface soil samples exceeded their respective human health <br /> risk screening levels except for chlordane and dieldrin in three (3) of the collected samples. Furthermore, <br /> three of the chlordane results exceeded the Title 22 hazardous waste threshold of 2.5 milligram per kilogram <br /> (mg/kg). The exposure pathway associated with OCPs is ingestion. The alternative method of isolating the <br /> exposure pathway when the remediation of hazardous chemicals (i.e. removal and proper disposal of <br /> contaminated soil) is not practical or safe, is by encapsulating the material in place (i.e. asphalt/concrete <br /> cap,hardscape landscaping). <br /> In summary, it is Condor's opinion that no further environmental investigation is warranted at the Site <br /> related to potential vapor encroachment condition. However, for greater certainty of the Site-specific risk <br /> associated with chloroform, indoor air and ambient air sampling could be conducted to evaluate actual <br /> chloroform concentrations in indoor air. <br /> Condor recommends that exposed soil surrounding the existing apartment complex be encapsulated to <br /> reduce the exposure pathway to the residual OCPs in surface soil. <br /> LIMITATIONS TO EXECUTIVE SUMMARY <br /> This executive summary should only be read as a brief summary, and not as a complete discussion of the <br /> full report text. The scope of work and limitations should be understood prior to reading the Site-specific <br /> information,results, and discussion. <br /> �/► CONDOR <br />