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I <br /> i !+ <br /> PAGE 8 �] <br /> F <br /> [. it <br /> 3� <br /> compounds it potentially contains are pumped away from the work <br /> area, thus reducing the potential for exposure. <br /> I,: <br /> i <br /> HRA RESULTS <br />' SoiI and ground water data were compared the risk-based screening levels <br /> described in the preceding section. The results of these comparisons are <br /> discussed below. !t ' <br /> SOIL �p <br /> Soil data from both the excavation confirmation sampling and the post- <br /> excavation investigation were compared to the risk-based screening levels <br /> for soil. All detected concentrations were well below thiE alculated <br /> screening levels. Table 5 summarizes the comparison of the maximum <br /> detected soil concentrations and the calculated screening Ilevels'. Based on <br /> this comparison, residual constituents in soil are not expected to pose an <br /> unacceptable risk under current and realistic future land use conditions, <br /> including construction, at the subject properties. <br /> The risk-based screening levels developed in this analysis do not consider <br /> cumulative exposures to multiple constituents. However; cumulative <br /> exposures to soil constituents are not expected to pose an!'unacceptable <br />` risk under a construction scenario for the following reasons: <br /> • Residual soil constituents were detected infrequently.; i <br /> • The opportunity for exposure to soil constituents is limited. <br /> f <br /> • The calculated screening levels far exceeded any of the reported <br /> constituent concentrations. !i <br /> GROUND WATER <br /> i} <br /> Post-remediation ground water monitoring data (i.e., data collected after <br /> October 1996) were compared to the risk-based screening;levels for <br /> ground water. All detected concentrations were below the calculated <br /> screening levels. Table 6 summarizes the comparison of the maximum <br /> detected ground water concentrations and the calculated,screening levels. <br /> Based on this comparison, residual constituent concentrations in ground <br /> water are not expected to pose an unacceptable risk under current and <br /> realistic future land use conditions, including construction, at the subject <br /> Pro erties. ,> <br /> p ;� <br />