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CENTRAL VALLEY REGIONAL BOARD REQUESTS <br /> FOR SITE CLOSURE <br /> (ADDENDUM TO APPEvi DI ( A) <br /> The Central Valley Underground Tank Program (Program) is implemented to <br /> achieve the objectives of State policies, regulations, and procedures adopted by the <br /> State Water Resources Control Board and Region Fivers Basin Plan To provide <br /> consistency in the Program, Appendix A to Tri-Regional Board Staff <br /> Recommendations for Preliminary Investigation and Evaluation of Underground <br /> Tank Sites was developed in 1981 by the Central Valley Regional Board staff and is <br /> revised periodically to accommodate statutory, regulation and policy changes. <br /> Appendix A prescribes minimum report contents which are to be submitted for <br /> review and approval. Appendix A streamlines the process for investigation and <br /> cleanup of sites to assure the discharger that the remediation system proposed is <br /> appropriate for the site subsurface conditions. Compliance with Regional Board's <br /> Appendix A is necessary before a request for closure may be submitted. <br /> Central Valley Board staff recognize that total cleanup of a site, although generally <br /> possible, is not always feasible or warranted ("site" includes on- and/ or off-site <br /> problems resulting from the release of underground tank contents). Therefore, <br /> closure of a site may be unconditional if the site has been remediated successfully, or <br /> with conditions that "no further action is required at this tune" when total cleanup <br /> can not be achieved. If complete remediation of the site has been achieved, the <br /> discharger can be provided with certification of that site status. To determine that a <br /> "no further action" at this time closure of a site is warranted and that some soil or <br /> ground water contaminants will remain, the discharger must submit a single report <br /> for Regional Board review. The report must discuss the site history, existing <br /> conditions, and rationale why the site may be closed with contamination remaining. <br /> The minimum information required is to be included in the report includes the <br /> following: <br /> 1. Distance to production wells for municipal, domestic, agriculture, <br /> industry and other uses within 2000 feet of the site, <br /> 2. Site maps, to scale, of area impacted showing locations of former <br /> and existing tank systems, elevation contours, gradients, and <br /> nearby surface waters, buildings, streets, and subsurface utilities, <br /> 3. FUgh and low ground water levels (below ground surface), <br /> 4. Tabulated results of all sampling and analyses, <br /> 5. Concentration contours of contaminants found and those <br /> remaining in soil and ground water, both on and off site, <br /> 6. Mass balance calculation of the substance treated versus that <br />