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Rationale why conditions remammd_at the state will not adversely impact water quality, health_or <br /> 1 other beneficial uses <br /> ' In soil, the high ratio of xylene concentrations to benzene concentrations in impacted soil <br /> generally indicates an aged gasoline release In addition, there is a soil interval between the <br /> lowest detected TPH-as-gasoline, benzene and MTBE and groundwater of approximately 65 feet <br /> ' Therefore, natural attenuation processes including biodegradation and volatilization should <br /> continue to reduce concentrations of petroleum hydrocarbons in sod over time Given that the <br /> ' release appears to be old, the site is capped, reducing surface water infiltration, and that a 65-foot <br /> soil buffer exists above the groundwater table, the gasoline hydrocarbons remaining in sod should <br /> not impact groundwater above water quality goals <br /> Since no volatile organic compounds, including benzene, were detected in soil samples collected <br /> adjacent to the on-site budding, the soil-volatilizing-to-indoor air exposure pathway for health risk <br /> assessment is not complete Exposures from hydrocarbons in soil-volatilizing-to-outdoor air are <br /> ' probably exceeded by exposures to hydrocarbon vapors produced by ongoing fueling operations, <br /> and pose little, if any, additional health risk <br /> Appendix B Summary <br /> 1 The Appendix B Summary as described in Tri-Regional Recommendations for Preliminary <br /> Investigation and Evaluation of Underground Storage Tank Sites, Appendix B, Requests for <br /> Closure is included in Appendix C <br /> . 16 <br />