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9.0 REQUEST FOR NO FURTHER ACTION Based on the recommendation for NFA at the site, SECOR has Included supplementary information to assist the SJCEHD in its evaluation of the site for case closure Additional site information is provided below in accordance with the Table 1 -- Checklist of Required Data For No Further Action Requests at Underground Tank Sites of the RWQCB's Appendix B Tn- Regional Board Staff Recommendation For Preliminary Investigations And Evaluations Of Underground Tank Sites— No Further Action Requests A compilation of historical site data Is Included as park of the Site Conceptual Model, and is further outlined and referenced below 1 91 Checklist of Required Data Presented below are the itemized categories of required site Information as outlined in Table 1 — Checklist of Required Data for No Further Action Requests at Underground Tank Sites, followed 1 by supporting site data Information previously submitted under a separate cover is referenced where applicable 1 (1) Distance to production wells for municipal, domestic, agriculture, industry, and other uses within 2000 feet of the site, lipAs discussed in Section 3 3, SECOR performed a water supply well survey In June 1997 (Appendix E) Review of DWR files and Information supplied by the Lockeford Community Services District confirmed the presence of one Irrigation well and two municipal wells within a 2,000-foot radius of the site The municipal wells are located approximately 900 feet northeast (upgradient) and 1,500 feet southwest (downgradient) of the site (SECOR, September 8, 1998) Other sensitive receptors in the vicinity of the site are the Mokelumne River, which Is located approximately 0 75 miles north (upgradienticross-gradient) of the site, and a creek situated approximately 600 feet northwest (upgradient) of the site A drainage pond for surface runoff during rainfall events is located In the southwest (downgradient) of the site This pond Is typically dry (SECOR, September 8, 1998) (2) Site maps, to scale, of area impacted showing locations of former and existing tank systems, excavation contours and sample locations, boring and monitoring well elevation contours, gradients, and nearby surface waters, buildings, streets, and subsurface utilities, ' Site features (wells, areas of excavation, soil borings, grab soil sample locations, soil vapor probe locations), and the surrounding site area, geologic-cross sections are Included on Figures 1 and 2, and on historical figures included in Appendix D Sensitive receptors are referenced above, and are included on a figure presented in Appendix E A groundwater elevation contour ' map and contaminant concentration map for October 4, 2004 are Included as Figures 4 and 8 Historical groundwater elevation contour maps and groundwater concentration maps from previous quarterly sampling events are Included In past quarterly report submittals, which are documented under Item 10 below A map showing the location and depth of underground utilities has not been constructed due to the depth to groundwater beneath the site (Table 3) ' Time Oil Asmt&SCM doc 15 March 17, 2005 770T 41 658 00 0015