SITE INFORMATION AND CORRESPONDENCE_1

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CCR, TIn.E 23, DIVISION 3, CHAPTER 16, UNDERGROUND STORAGE TANK REG111AnONS CCR, TITLE 23, DIVISION 3, CHAPTER 16, UNDERGROUND STORAGE TANK REGULATIONS Reference: 1I&SC Sections 25295, 25298, 25299.37, and 40 CFR Sections 280.61 and agency directive. 280.62 (d) The Corrective Action Plan shall include-elle following elements: (1) an assessment of die Impacts listed in subsection(e)of this Section; 2724. Conditions That Require SoR and Water Investigation The responsible party shall conduct Investigations of the unauthorized release,the (2) a feasibility study, In accordance with subsection(f)of this Section;and release site,and the surrounding area possibly affected by the unauthorized release,If (3) applicable cleanup levels,in accordance with subsection(g)of this any of the following conditions exists: Section. (1) There Is evidence that surface water or ground eater has been or may be (e) M assessment of the impacts shall Include,but is not limited to, the following: affected by the unauthorized release; J ct Is found at the site where the unauthorized release (1) The physical and chemical characteristics of the Hazardous substance or (2) Free product occurred u 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 hydrogeologlc 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 current and potential beneficial uses of these waters; of nearby surface water or ground water,and water or ground water resources or based on the increased risk of fire or -elle explosion. (4) The potential effects of residual contamination on nearby surface water Authority: iI&SC Section 25299.77 and ground water;and Reference: Ff&SC Sections 25299.37 and 40 CFR Sections 280.61 through 280.64 (f) The responsible parry 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 shall propose to Implement the most cost-effective (a) The Soil and Water investigation Please Includes the collection and analysis of corrective action. data necessary to assess the nature and vertical and lateral extent of the release (1) For all sites,each recommended alternative shall be designed to mitigate and to determine a cost-effective method of cleanup. nuisance conditions and risk of fire or explosion; (b) Using Information obtained during the investigation,the responsible party shall 2 For sites where the unauthorized release affects or threatens waters with propose a Corrective Action Plan. The Corrective Action Plan shall consist of ( ) current or potential beneficial uses designated in water quality control those activities determined to be cost-effective. plans, the feasibility study shall also Identify and evaluate at least two (c) The responsible party shall submit-elle Corrective Action Plan to the regulatory alternatives for restoring or protecting these beneficial uses; agency for review and concurrence. The regulatory agency shall concur with For sites where the unauthorized release affects or threatens waters with the Corrective Action Plan after determining that implementation of the plan (3) no current or potential beneficial uses designated in water quality will adequately protect human health,safety and the environment and will control plans, the feasibility study shall Identify and evaluate at least one restore or protect current or potential beneficial uses of water. The responsible alternative to satisfy paragraph(1)of this subsection. parry shall modify the Corrective Action Plan in response to a final regulatory 11 -6 I1 • 5 S � }