SITE INFORMATION AND CORRESPONDENCE

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;. CCR, Trrt.r: 23, DIVISION 3, CIIAPTEH 16, (UNDERGROUND STORAGE TANK REGULATIONS 2725. Soil and Water Investigation Phase '----- _ (a) The Soil and Water Investigation Phase includes the collection and analysis of data necessary to assess he nature and vertical and lateral extent of the release and to determine a coat-effective method of cleanup. (b) Using information obtained during the investigation, the responsible parry shall Propose a Corrective Action Plan.'The Corrective Action Plan shall consist of those activities determined to be cost-effective. (c) The responsible parry shall submit the Corrective Action Alan to the regulatory agency for review and concurrence. The regulatory agency shall concur with the Corrective Action Plan aper 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 Parry shall modify the Corrective Action Plan in response to a final regulatory agency directive. (d) The Corrective Action Plan shall include the following elements: (1) an assessmentof the impacts listed in subsection(c) of this Section; (2) a feasibility study, in accordance with subsection(1)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 not limited to, the following; (1) The physical and chemical characteristics of the hazardous substance or its constituents,including their toxicity, Persistence and potential for f migration in water,soil, and air; (2) The hydrogeologic characteristics of the site and the surrounding area where the unauthorized release has Migrated ted Or may y migrate; (3) The Proximity and quality of nearby surface water or ground water, and [tie current and Potential beneficial uses of these waters; } (4) The potential effects of residual contamination on nearby surface water and ground warcr;and (t) The responsible party shaft conduct Ia feasibility study[o evaluate alternatives for remedying or mitigating the acrual or potential adverse effects of the unauthorized release. Each alrcrnauvc corrective action. shall be evaluated for cosy-effecriveness, and the responsible party shall prop oae to implement the most cost-effective (1) For all sites, each recommended alternative shall be designed to mitigare nuisance conditions and risk of fire or explosion; (2) For sites where the unauthorized release affects or threatens waters with current or potential 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; (3) For sites where the unauthorized release affects or threarens waters with no current or potential bcneticial uses designated in water quality control plans, the feasibility study shall identify and evaluate a ir'vje;Lsone alternative to satisfy paragraph (1)of this subsccuon. (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 shall meet the following requirements; (t) For waters with current or Poendal 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 objectives have been designated in water quality control plans, the responsible party shall recommend target cleanup levels for long- term cprrectivc actions to the regulatoryagency 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 23299.77 Reference: H&SC Sections 25299.37, 25299.57