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k , Request for Site Closure page 6 Chevron U.S.A. Products Company,3245 East Fremont Street, Stockton, CA January 3, 1995 REQUIRED INFORMATION Listed below is a summary of the information required for closure requests as outlined in the Addendum to Appendix A of the Tri-Regional Board Staff Recommendations For Preliminary Evaluation and Investigation of Underground Storage Tanks (CRWQCB-NCR, SFB, CVR, 1990). 1. Distance to production wells for municipal, domestic, agriculture, industry and other uses within 2000 feet of the site. ■ Figures 1 and 2 ■ Report of Investigation (EA, 1987) 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 ■ site map showing elevation contours and nearby surface waters (Figure 1) ■ site map showing buildings, streets and subsurface utilities (Figure 2) ■ site map showing locations of former tank systems (Figure 3) ■ site map-showing groundwater gradient (Figures 8 and 9) ■ site maps showing areas of impact (Figures 4, 5, 6 and 7) 3. High and low groundwater levels ■ Table 2, Figures 5, 6, and 10 4. Tabulated results of all sampling and analyses ■ Table 1 (Soil) Table 2 (Groundwater) 5. Concentration contours of contaminants found and those remaining in soil and groundwater both on and off site. Figures 4, 5 and 6 (Soil) Figure 7 (Groundwater) 6. Mass balance calculation of the substance treated versus that remaining ■ Attachment 3 7. Not Applicable 8. Not Applicable 9. Rationale why conditions remaining at the site will not adversely impact water quality, health, or to other beneficial uses. ■ See Rationale For Site Closure section above. REFERENCES 0072clos.rpt DEAN GROUNDWATER ❑❑❑ TECHNOLOGY ,