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GEOMATRIX <br /> Based on the limited areal extent of the separate-phase petroleum, the low concentrations of <br /> volatile petroleum hydrocarbon constituents, and the 30 feet of soil between the separate-phase <br /> petroleum and the ground surface, chemicals volatilizing from the separate-phase petroleum are <br /> not considered to be a significant source of exposure at the site. Therefore, the separate-phase <br /> petroleum at depth is unlikely to pose an unacceptable risk to human health under an industrial <br /> scenario. <br /> 6.0 RECOMMENDATION <br /> Site data indicate that the residual petroleum present in the subsurface is not significantly <br /> impacting the beneficial use of groundwater(i.e.,groundwater constituents were not detected <br /> above WQOs). Therefore, according to the Consistent Technical Approach, the site would be <br /> classified as a"Soil Case", and site conditions would be evaluated by the local agency (in this <br /> case the SJC-EHD),which would include an evaluation of potential health risks associated with <br /> the residual petroleum in soil. Site data indicate that the residual petroleum in the soil <br /> (including the separate-phase petroleum) does not present an unacceptable risk to human <br /> health. Site data also indicate that no further site investigation activities are required at this <br /> time. However, due to the presence of separate-phase petroleum collocated with groundwater <br /> at the site, site conditions should be presented to RWQCB for their evaluation. <br /> 4\sf31deptdata\Doc Safe15000s\SoI IVS1 HRA Rpt.dac 13 <br />