SITE INFORMATION AND CORRESPONDENCE_FILE 1

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` CCR1i �t• 23, DIVISION j, C1IAPTER 16; UNDERGROUND ,STORAGE TANK / REG UI(TIONS 2725. Soil and Water Investigation Phase - +) The Soil and Water in' data necessary estigaclon Phase includes the collection and analysis of to assess the nature and vertical and lateral extent of the release and to determine a cost-effective method of cleanup. (b) Using information obtained during the investigation, the responsible party shall Propose a Corrective Action Plan. The Corrective Action Plan shall consist of those activities determined to be cost-ef ecrive. (C) The responsible parry shall submit the Corrective Action Plan to the regulatory agency,For review and concurrence. The regulatory agency shall concur with the Corrective Action Plan after determining that 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 Corrective Action Plan in re agency directive, sponse to a final regulatory (d) The Corrective Action Planshall include thefollowing elements: (1) an assessment of the impacts listed in subsection(c)of this Section; _ i (2) a'_feasibiliry study, in accordance with subsection(f)of this Section- and (3) applicable cleanup levels,in accordance with subsection(g) of this Section. (e) An assessment of the impacts shall include, but is nor limited to, the following: (l) The physical and chemical characteristics of the hazardous substance or its constituents, including their coxiciry, persistence and potential for migration in water,soil, and air; ('-) The hydrogeologic characteristics of the site and the surrounding area where the unauthorized release has migrated or may migrate; i (3) The proximicy and quality Of nearby surface water or ground'wacer, and the current and potential beneficial uses of these waters; (4) The potential effects of residual contamination on nearby surface water and ground water; and (f) The responsible parry 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 cvaluafcd for cost-effectiveness, and the responsible party shall propose co implement the most cost-effective corrective action. (1) For all sites,each recommended alternative shall be designed to mitigate nuisance conditions and risk of fire or explosion; (2) For sites where the unauthorized release affecrS.or threatens waters with current or potential bencficW uses designated in water quality control plans; the feasibility study shad also identify and evaluate ac least two alternatives for restoring or protecting these beneficial uses; (3) For sites where the unauthorized release affecrs or threatens waters with no current orpotential 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 bythe unauthorized release,shall comply with the requirements of Section 2721(b) and shall.meet 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 at least two alternatives to achieve these numerical objectives; (2) For waters with current or potential beneficial uses for which no numerical obiectives have been designated in water quality control plans, the responsible parry shall recommend target cleanup levels for long- term corrective actions to the 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: H&SC Sections 25299.37, 25299.57