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Case Closure Summary Page " <br /> making Underground Fuel Storage Tank Pr,%e am <br /> 111 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) < 1 <1 .00063 <.05 Ethylbenene .025 <.005 .053 <.0005 <br /> TPH(Diesel) NA NA NA NA Xylene .430 <,01 .09 <.0005 <br /> Benzene <.005 <.005 .037 <.0005 MTBE 4.7 .053 27 .0014 <br /> Toluene .0086 <.005 .019 <,0005 1,2 DCA NA <.005 ND .00081 <br /> Comments: Soil Before results are from soil beneath Dispenser 3 on 11/20/96, except MTBE that is from boring SB2 at 16 <br /> feet on 10/5/98. Soil After results are from MW11 at 26 feet on 10/30/03. Water Before results are from MW2 on 9/10/01 <br /> except for MTBE which is from MW 1 on 6/4/01. Water After results are from MW9 on 11/20/08. Samples from other wells <br /> on 11/20/08 were non-detect. The only cleanup performed was the extraction of groundwater for the pump test in <br /> November 2003. <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: Some Number Decommissioned: 3 Number retained: 10 <br /> List enforcement actions taken: NOR <br /> List enforcement actions rescinded: <br /> V. Local Agency Representative Data <br /> Name: Margaret Lagorio Title: Program Coordinator <br /> Signature: Date: a 9l0 <br /> VI. Central Valley Regional Water Quality Control Board (RB) Notification <br /> Date Submitted to RB: Response Date: <br /> RB Staff: James L.L. Barton Response: <br /> Title:Associate Engineering Geologist <br /> VII. Additional Comments, Data, etc. <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 />