SITE INFORMATION AND CORRESPONDENCE

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CCR, TrrLE 23, DtvistoN 3, CHAPTER 16,UNDERGROUND STORAGE TANK REGUtAnoNs CCR,TITLE 23, OMSFON 3,CHAPTER 16, UNDERGROUND STORAGH TANK REGuiAnONS Reference: H&SC Sections 25295, 25298, 25299.37,and 40 CFR Sections 280.61 and agency directive. 280.62 (d) The Corrective Action Plan shall include the fotlowing elements: 2724. Conditions That Require Soil and Water.Investigation (1) an assessment of the Impacts listed in subsection(e)of this Section; The responsible party shall conduct investigations of the unauthorized release,the (2) a feasibility study,in accordance with subsection(f)of thls Section; and release site,and the surrounding area possibly affected by the unauthorized release,If any of the following conditions exists: (3) applicable cleanup levels,in accordance with subsection(g)of this Section. (1) There is evidence that surface water or ground eater has been or may be affected by the unauthorized release; (e) An assessment of the impacts shall Include,but is not limited to, the following: (2) Free product is found at the site where the unauthorized release (1) The physical and chemical characteristic's of the hazardous substance or occurred or In the surrounding area; its constituents,Including their toxicity, persistence and potential for migration In water,soil, and air; (3) There is evidence that contaminated soils are or may be in contact with surface water or ground water;or (2) The hydrogeologic characteristics of the site and the surrounding area where the unauthorized release has migrated or may migrate; (4) The regulatory agency requests an Investigation,based on the actual or potential effects of contaminated soil or ground water on nearby surface (3) The proximity and quality of nearby surface water or ground water,and water or ground water resources or based on the Increased risk of fire or the current and potential beneficial uses of these waters; explosion. (4) The potential effects of residual contamination on nearby surface water Authority: H&SC Section 25299.77 and ground water;and Reference: H&SC Sections 25299.37 and 40 CFR Sections 280.61 through.280.64 (f) . The responsible party shall conduct a feasibility study to evaluate alternatives for remedying or mitigating the actual or potential adverse effects of the 2725. Soil and Water Investigation Phase unauthorized release. Each alternative shall be evaluated for cost-effectiveness, and the responsible party shalt propose to implement the most cost-effective (a) The Soil and Water investigation Phase includes the collection and analysis of corrective action. data necessary to assess the nature and vertical and lateral extent of the release and to determine a cost-effective method of cleanup. (1) For all sites,each recommended alternative shall be designed to mitigate nuisance conditions and risk of fire or explosion, Using Information obtained during the investigation, the responsible party shall propose a Corrective Action PIan, The Corrective Action Plan shall consist of (2) For sites where the unauthorized release affects or threatens waters with those activities determined to be cast-effective. current or potential beneficial uses designated in water quality control plans,the feasibility study shall also identify and evaluate at least two (c) The responsible party shall submit the Corrective Action Pian to the regulatory alternatives for restoring or protecting these beneficial uses; agency for review and concurrence. The regulatory agency shall concur with the Corrective Action Plan after determining that implementation of the plan (3) For sites where the unauthorized release affects or threatens waters with will adequately protect human health,safety and the environment and will no current or potential beneficial uses designated in water quality restore or protect current or potential beneficial uses of water. The responsible control plans, the feasibility study shall identify and evaluate at least one party shall modify the Corrective Action Plan in response to a final regulatory alternative to satisfy paragraph(1)of this subsection. 11 5 11 -6