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Case Closure Summary Page 2 <br /> Leaking Underground Fuel Storage Tank Program <br /> III Release and Site Characterization Information (continued) <br /> Maximum Documented Contaminant Concentrations--Before and After Cleanup <br /> Contaminant Soil (ppm) Water (ppm) Contaminant Soil {ppm) Water (ppm <br /> Before After -Before After Before After Before After <br /> TPH(Gas) 16,000 13,060 52 .87 Ethylbenene 210 160 1.8 .007 <br /> TPH(Dlesel) NA NA NA NA Xilene 920 450 7.2 .003 <br /> Benzene 55 20 9.7 .025 <br /> Toluene 69 119 6.9 .0014 MTBE NA NA NA <.001 <br /> Comments: Soil Before Results for Benzene and Toluene are from SB3 (8194),for TPH-g, Ethylbenzene, Xylene are from <br /> Pit Interior Sample 2-12'(7/98). Soil After Results are from excavation sidewall sample 1-12' (7/98) Water Before Result: <br /> are from MW1 on 8126194. Water After Results are from MW1A on 3124104. See site specific reports. 1522 cubic yards•c <br /> soil were excavated in 7198. Groundwater sample contaminant results have reduced significantly since the excavation of <br /> the contaminated soil. Some contaminated soil remains In place. <br /> IV.Closure - <br /> Does completed corrective action protect existing beneficial uses per the Regional Board Basin Plan? Yes <br /> Does completed corrective action protect potential beneficial uses per the Regional Board Basin Plan? Yes <br /> Does corrective action protect public health for current land use? Yes <br /> Site management requirements: None <br /> Should corrective action be reviewed if land use changes?Yes <br /> Monitoring/Vapor wells decommissioned: Yes Number Decommissioned: 10 Number retained: 0 <br /> List enforcement actions taken: NOR <br /> List enforcement actions rescinded: <br /> t <br /> V. Local Agency Representative Data <br /> EName: onna Horan, REPS Title: Director, Environmental Health Department <br /> : Date: cJ Z-�C7 <br /> Vi. Central Valley Regional Water Quality Control Board (RB)Notification <br /> FStaff. <br /> ed to RB: 7129/04 Response Date: 08/11/04 <br /> es Barton Response: Concurrence <br /> te En ineerin Geol2aist <br /> VII. Additional Comments, Data, etc. <br /> FNew production well with 200 foot annular seal installed in March 2004. Old production well destroyed by explosion and <br /> ent rout in Max2004. <br /> This document and the related CASE CLOSURE LETTER,Shall be retained by the lead agency as part of the officl <br /> site file. <br />