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«i (b) The hydrogeologic characteristics of the site and the surrounding area where the unauthorized release has migrated or may migrate, (c) The proximity and quality of nearby surface water or ground water, and the past, present, or future beneficial uses of these waters, (d) The potential effects of residual contamination on nearby surface water and ground water (2) A Feasibility Study, in accordance with the following The responsible party shall conduct a feasibility study to evaluate alternatives for remedying or mitigating the actual or potential adverse effects of the unauthorized release Each alternative shall be evaluated for cost-effectiveness, and the responsible party shall justify the alternative proposed for implementation (a) For all sites, each alternative shall be designed to mitigate nuisance conditions and risk of fire or explosion, (b) For sites where the unauthorized release affects or threatens to affect waters with past, present, or future beneficial uses designated in water quality control plans, the feasibility study shall also identify and evaluate at least two alternatives for restoring or protecting these beneficial uses, and for complying with other applicable provisions of the water quality control plans, (c) For sites where the unauthorized release affects or threatens waters with no past, present, or future beneficial uses designated in water quality control plans, the feasibility study shall identify and evaluate at least one alternative to satisfy paragraph (a) of this subsection (3) Develop Applicable Cleanup Levels, in accordance with the following (a) Each alternative shall contain cleanup levels, either proposed by the responsible party for regulatory agency concurrence or established by the regulatory agency (4) Develop a Verification Monitoring Program, in accordance with the following (a) The Verification Monitoring Phase includes all activities required to verify that no further corrective action is required (b) The responsible party shall make this verification by sampling or other monitoring of soil and/or water for such period of time and intervals agreed to by the regulatory agency ASSESSMENT OF IMPACTS Previous Site Assessment Activities A complete summary of all soil and groundwater investigation activities is contained in a Request for Site Closure Report (Acton Mickelson van Dam, Inc (AMV), 1995) The Request for Site Closure Report (RSCR) included a site history, water supply well survey, the initial distribution of petroleum hydrocarbons in soil and groundwater, hydrogeology, the current (post-remediation) distribution of petroleum hydrocarbons in soil and groundwater, a mass balance of petroleum constituents in soil and groundwater, discussions and recommendations, attainable cleanup levels, and their rationale for closure The RSCR was deemed to be incomplete by PHS in a letter to Ultramar dated February 24, 1995, however, PHS did not specify any particular deficiencies RTD reviewed the RSCR and correspondence with PHS As part of RTDs review of the RSCR in comparison to the Appendix B - 2 -