SITE INFORMATION AND CORRESPONDENCE

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t CENTRAL VALLEY REGIONAL BOARD REQUESTS {- FOR SITE CLOSURE t. 3 .:- % Al- The -The Central Valley Underground Tank Program (Program) is implemented to achieve the objectives discussed in this section using State policies, regulations, and 3 procedures adopted by the State Water Resources Control Board and the contents of f: this Basin Plan. To provide consistency in the Program, Regional Board Reporting Requirements for Underground Tanks have been promulgated and is revised periodically to accommodate statutory, regulation and policy changes. Appendix A , prescribes minimum report contents which are to be submitted for review and - approval. The Requirements streamline the process for investigation and cleanup of sites to assure the discharger that the remediation system proposed is appropriate for the site subsurface conditions. Compliance with Regional Board Reporting Requirements for Underground Tanks is required before a request for closure may be submitted. It is recognized that total cleanup of a site is not always possible ("site" includes on- f and/ or off-site problems resulting from the release of underground tank contents). F' 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. If complete remediation of the site has been achieved, the discharger can be provided with certification of that site status. To determine that a "no further action at this time closure" of a site is warranted and that some soil or ground water contaminants will remain, the discharger may submit a request for Regional Board review. The request must discuss the site history, existing conditions, and rationale why the site may be closed with contamination remaining. The minimum information required :rust be included in a single report discuss the following: 1. Distance to production wells for municipal, domestic, agriculture, industry and other uses within 2000 feet of the site, 2. Site maps, to scale, of area impacted showing locations of former and existing tank systems, elevation contours, gradients, and nearby surface waters, buildings, streets, and subsurface utilities, i 3. High and low ground water levels (below ground surface), A 4. Tabulated results of all sampling and analyses, 5. Concentration contours of contaminants found and those remaining in soil and ground water, both on and off site,