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• An individual COC:carcinogenic risk of 1.0E-6, a cumulative COC risk of 1.0E-5 and a <br /> hazard index of 1.0E+0'are the,acceptable target risk levels. <br /> ,,� • Average depth to groundwater in the site vicinity is 45 feet. ! <br /> • The average annual precipitation rate in the site vicinity is 14 inches per year. <br /> • ° Soil samples collected from confirmation soil boring CPT-1A in August 2000 comprise <br /> the soil data set used in the assessment. <br /> ` • Groundwater analytical data collected during the four 2005 quarterly monitoring events <br /> comprise the groundwater°data set used in the RBCA assessment. <br /> f • A 98% upper confidence level (UCL) is representative of constituent concentrations in <br /> soil and groundwater. <br /> E, <br /> '( • The off-site receptor selected'for..the Domenico Groundwater Model is St. Joseph's <br /> Hospital approximately 500 feet to the west of the former USTs. <br /> • The closest drinking water s",upply well is located at St. Joseph's Hospital. This is based <br /> on a water well survey conducted in November 2000 by Ramage Environmental, Inc. A <br /> copy of the water well survey;is included as Appendix E. <br /> . ... <br /> 4.2 Results <br /> _ The RBCA assessment was based'oh soil analytical data from boring CPT-1A, and from 2005 <br /> groundwater analytical data from: site4ells MW-2 through MW-7, MW-8A, MW-81B, VW-1 D and <br /> VW-2D. The results of this assessment-indicated that none of the target risk levels or hazard <br /> I + indices were exceeded. In addition-,' on' <br /> ne of the SSTLs generated by the RBCA tool were <br /> S_ <br /> LA ­ <br /> exceeded. Finally, results from the Domenico groundwater model predict that point of exposure <br /> U concentration limits will not be met or exceeded. <br /> I <br /> f 19 <br /> iL) <br />