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KLEINFELDER <br /> 6 DISCUSSION OF ANALYTICAL RESULTS, CONCLUSIONS AND <br /> RECOMMENDATIONS <br /> 1 Twenty two (22) of the 33 soil samples collected during this assessment were analyzed <br /> for various analytical suites and analytes including metals, petroleum constituents, <br /> volatile organic compounds and semi-volatile organic compounds as listed in Section 5. <br /> Of the requested analyses selected metals and TRPH only, were detected above <br /> reporting limits. The analytical results are summarized in the attached Tables 1 , 2 and <br /> 3. Total metal results are summarized on Table 1 and 2 and the remaining analyses <br /> ' are summarized on Table 3. For details refer to the chain-of-custody form and <br /> analytical reports in Attachment C. <br /> j The TRPH results were reported by the laboratory and detected TRPH concentrations <br /> in three of six soil samples from the Debris Area and ranged in concentration from 10 to <br /> 20 mg/kg, slightly above the reporting limit. These values appears to be a deminimus <br /> quantities of TRPH, and based on Kleinfelder's experience would not generally trigger <br /> additional sampling or enforcement actions by regulatory enforcement agencies or have <br /> additional restrictions for disposal purposes. <br /> 1 <br /> The detected me compared metal results were to the California Code of Regulations <br /> 22CCR§66261.24 (CCR) and/or the Residential U.S. EPA Region IX Preliminary <br /> Remediation Goals (PRGs), dated November 1, 2000 and the Office of Environmental <br /> Hazard Assessment (OEHHA) health risk values. <br /> PRGs are contaminant concentrations in environmental media (i.e. soil, air, water), <br /> calculated by the U.S. EPA, that can be used as screening tools to evaluate a site for <br /> potential human health risks. PRGs are calculated using standard assumptions and <br /> are specific for land use conditions (e.g. residential or industrial). The chemical <br /> concentrations calculated by the U.S. EPA typically correspond to a fixed level of risk <br /> (usually 10-6, or 1 in 1,000,000 cancer risk, or a non-cancer hazard quotient of 1) for <br /> soil, air, and water. The following exposure pathways were accounted for in the PRG <br /> calculation for soils assuming residential land use: <br /> 1 . Ingestion <br /> Inhalation of particulates <br /> Inhalation of volatiles <br /> ` 0 Dermal (skin) absorption <br /> OEHHA values follow similar criteria and are also based on similar factors such as a 1 <br /> in 1,000,000 cancer risk. See Tables 1 and 2 for comparison of values between <br /> OEHHA and Residential PRGs. <br /> 58671.E02/ST05R1127/DH:ly Page 16 of 22 <br /> ©2005 Kleinfelder, Inc. September 15, 2005 <br />