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07/19/96 PRI 10 41 FAX 583 3282 ULTRAKAR i + HORIZON SAC Q 004 CENTRAL VALLEY REGIONAL WATER QUALITY CONTROL BOARD STAFF RECOMMENDATIONS FOR CLOSURE REQUEST'S The Central Valley Undergmund Tank Program (Program) is unplemented to achieve the goals of State P0hcies, regulations, and procedures adopted by the State Water Resources Control Board and the Regional Board's Basir% Plans To provide consistency in the Program, the Trf-Regtonal Board Staff Recommendations for PrChm:nary Investigation and Evaluation of Underground Tank Saes 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 A prescribes 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 --2j process. ZiLmpliance with Regional Board's Appendix B 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 art objective decision regarding the requested closure. The closure report and the Board's sum=ary closure letter will remain on file in the Regional Board office for public review. Central Valley Regional Board staff recognize that total cleanup of a site, although generally possible, is not always feasible or warranted ("site" includes on- and/gr 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 .ter total cleanup can not be achievedCRegardless 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 ,sod or ground water contanmutants will remain. +--� The report must discuss the site history, existing conditions, and rationale why the site may be closed with contamination renis rung. The rationale must include a finding aboututu a !MP- crs on water quality and health, The summa checklist is to be completed and submitted with the closure report by the Responsible PaRyUR or their designee. If it has been determixted that only soil has been impacted, evidence substantiating the condition must be submitted. V d wc2!. Wb LE LL 9sst-61-L