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Case Closure Summary Page �! <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 <br /> Before After Before After (ppm) Water (ppm) <br /> Before After Before After <br /> TPH (Gas) NA NA NA NA Xylene NA <.005 NA <.0005 <br /> TPH (Diesel) 11 <5 .240 <.05 Ethylbenzene NA <.005 NA <.0005 <br /> Benzene NA <.005 NA <.0005 Oil &Grease NA NA NA NA <br /> Toluene NA <.005 NA <.0005 MTBE NA <.05 NA <.0005 <br /> Comments: Soil Before results are from geoprobe GP4 on 12/20/04 and the analysis was for TPH-diesel only. Soil After <br /> results are from the monitoring wells installed in September 2006. Water Before results are from GP1 on 12/20/04 and the <br /> analysis was for TPH-diesel only. Water After results are from the monitoring wells on 10/27/06. <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? No <br /> Monitoring/Vapor wells decommissioned:Yes Number Decommissioned: 3 Number retained:0 <br /> List enforcement actions taken: NOR sent to RP. <br /> List enforcement actions rescinded: NA <br /> V. Local Agency Representative Data <br /> Name: Donna Heran Title: Director of Environmental Health <br /> Signature: Date: <br /> t^���. - ) 1-3� -o <br /> VI. Central Valley Regional Water Quality Control Board (RB) Notification <br /> DaEEng, <br /> itted to RB: May 15, 2007 Response Date: June 1, 2007 <br /> RB Barton Response: Concurrence <br /> TitlGeologist <br /> VII. Additional Comments, Data, etc. <br /> Contamination discovered in geoprobe samples was not confirmed in the groundwater investigation using 3 on-site <br /> monitoring wells. The MWs 3 were destroyed under EHD permit. <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 />