SITE INFORMATION AND CORRESPONDENCE FILE 1

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CCR, TITLE 23, DIVISION 3, CNArrER 16, UNDERGROUND STOMCE T.WK REGUTATIONS 2725. So" and Water Investigation Phase - � (a) The data nail and Water Investigation Phase includes the collection and analysis of necessary to assess the nature and vertical and lateral ascent of the release and to determine a cost-clf cdve method of cleanup. (b) Using information obtained during the investigation, the responsible parry shall Propose a CorreciW Acdon Plan. The CbrfecriVC MCdOn Pian shall consist of those acrivicies determined to be coso-cffecuve. (c) The responsible parry shall submit the Correcdve Acrion Plan to the regulatory agency for review and concurrence. The regulatory agency shall concur with the COrracrive Action Plan after determining Chat implementation of the plan will adequately protect human health, safety and the environment and will restore or protect current or potential beneficial uses of water. The responsible party shall modify the Correcrive Action Plan in response to a final regulatory agency directive. (d) The Corrective Action Plan shall include the following elements: ( 1) an assessment of the impacts listed in subsection (c) of chis Section; (2) a feasibility study, in accordance with subsection (1) Of this Section; and (3) applicable cleanup levels, in accordance with subsection (g) of chis Section. (c) An assessment of the Impacts shall include, but is nor limited in, the following: ( 1) The physical and chemical characteristics of the hazardous substance or its constituents, including their toxicity, persistence and potential for migration in water, soil, and air; (2) The hydrogeologic characteristics of the She and rhe surrounding area where the Unauthorized release has migrated or may migrate; (3) The proximity and quality of nearby surface warer or ground water, and Che current and potential beneficial uses Of these waters; (4) The potential effects of residual contamination on nearby surface water and ground water; and (t) The responsible parry shall conduce 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 propose to implement the most cost-effectiveCorrective action. (1) For all sires, each recommended alternative shall be designed cc mitigate nuisance conditions and risk of Fre or explosion; (2) For Sims where the unauthorized release affects or threatens waters with current or potential beneficial uses designated in water quality control plans, the feasibility study shag also idencify and evaluate at least two alternatives for restoring or protecting these beneficial uses; (3) For sires where the unauthorized release affects or threatens waters with no current or potential beneficial uses designated in water quality control plans, the feasibility study shall identify and evaluate at lease one alternative to satisfy paragraph ( 1) of this subsection. (g) Cleanup levels for ground or surface waters, affected or threatened by the unauthorized release, Shall comply with the requirements of Section 2721(b) and shalt meat the following requirements: ( 1) For waters with current or potential beneficial uses for which numerical objectives have been designated in water quality control plans, the responsible parry shall propose a least two alternatives co achieve these numerical objectives; (2) For waters with currcnc or potential beneficial uses for .which no numetical Objectives have been designated in water quality control plans, the responsible parry shall recommend urger cleanup levels for long- term corrective actions to rhe regulatory agency for concurrence. Target cleanup levels shall be based on the impact assessment, prepared in accordance with subsection (e) of this section. Authority: H&SC Section 25299, 77 Reference: H3:SC Sections 25299.370 25299. 57