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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 13,000 52 .87 Ethylbenene 210 160 1.8 .0073 <br /> TPH(Diesel) NA NA NA NA Xylene 920 450 7.2 .0032 <br /> Benzene 55 20 9.7 .025 <br /> Toluene 69 19 6.9 .0014 MTBE NA NA NA < .001 <br /> Comments: Soil Before Results for Benzene and Toluene are from SB3 (8/94), 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 Results <br /> are from MW 1 on 8/26/94. Water After Results are from MW 1 A on 3/24/04. See site specific reports. 1522 cubic yards of <br /> soil were excavated in 7/98. Groundwater sample contaminant results have reduced significantly since the excavation of <br /> the contaminated soil. Some contaminated soil remains in place. <br /> L- 11 <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: Number Decommissioned: 5 Number retained: 5 <br /> List enforcement actions taken: NOR <br /> List enforcement actions rescinded: <br /> V. Local Agency Representative Data <br /> Name: Margaret Lagorio Title: Supervising REHS <br /> Signature: Date: -7 �� I <br /> VI. Central Valley Regional Water Quality Control Board (RB) Notification t <br /> Date Submitted to RB: Response Date: <br /> RB Staff: James Barton Response: <br /> Title: Associate Engineering Geologist <br /> VII. Additional Comments, Data,etc. <br /> New production well with 200 foot annular seal installed in March 2004. Old production well destroyed by explosion and <br /> cement grout in May 2004. <br /> This document and the related CASE CLOSURE LETTER, Shall be retained by the lead agency as part of the official <br /> site file. <br />