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. Request for Site Closure — 5 Chevron U S A Products Company,2400 Airport Way,Stockton,CA January 15, 1996 REQUIRED INFORMATION Listed below is a summary of the information required for closure requests as outlined in the Addendum to Appendix B 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 2,000 feet of site ■ Table 3 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(Figure 3) ■ Site maps showing areas of impact(Figure 3) 3 High and low groundwater levels ■ Table 2 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 ■ Figure 3 (soil), no impacted groundwater 6 Mass balance calculation of the substance treated versus that remaining ■ Figure 4 7 Technology used to clean the site, if Best Available Technology(BAT)was not used, explain why ■ Not Applicable 8 Zone of influence calculated for the subsurface remediation system and the zone of capture attained for the sod and groundwater remediation system ■ Not Applicable 9 Reasons why"background"was/is unattainable using BAT ■ Not Applicable 10 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 0INclas rpt(Chv-56) ❑❑®GROUNDWATER ❑❑❑TECHNOLOGY