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CENTRAL VALLEY REGIONAL WATER QUALITY CONTROL BOARD STAFF RECOMMENDATIONS FOR CLOSURE REQUESTS The Central Valley Underground Tank Program (Program) is implemented td achieve the goals of State policies, regulations, and procedures adopted by the State Water Resources Control Board and the Regional Board's Basin Plans. To provide consistency in the Program, the Tri-Regional Board Staff Recommendations for Preliminary Investigation: and Evaluation of Underground Tank Sites and its Appendix A, both based on concepts originally developed in 1981 by the Central Valley Regional Board staff, are revised periodically to accommodate statutory, regulation and policy changes. Appendix Aprescribes minimum report contents which are to be submitted for review and approval. Appendix A streamlines the process for investigation and cleanup of sites to assure the discharger that the remediation system proposed is appropriate for the site subsurface conditions. Appendix B for site closure has been developed to complete the documentation process. Compliance with Regional Board's Appends-,--13 is necessary before a request for closure may be submitted. The request must include signatures of registered individuals as required by the California Business and Professions Code. The purpose for a closure report is to provide a document upon which the regulator may make an objective decision regarding the requested. closure. The closure report and the Board's summary closure letter will remain on file in the Regional Board office for public review. Central Valle}' Regional Board staff recognize that total cleanup of a site, although generally possible, is not always feasible or warranted ("site" includes on- and/or off- site problems resulting from the release of underground storage tank contents). Therefore, closure of a site may be unconditional if the site has been remediated successfully, or with conditions that "no further action is required at this time" when total cleanup can not be achieved. Regardless of the action requested, a closure report is required for Regional Board review The closure report is to document whether complete remediation of the site has been achieved, or that a "no further action" closure of a site is warranted and that some soil or ground water contaminants will remain. The report must discuss the site history, existing conditions, and rationale why the site may be closed with contamination remaining. The rationale must include a finding about future impacts on water quality and health. The summary checklist is to be completed and submitted with the closure report by the Responsible Party0es) or their designee. If it has been determined that only soil has been impacted, evidence r substantiating the condition must be submitted. t