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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) 1240 1240 <0.050 <0.050 Xylene <0.50 <0.50 <0.00050 <0.0005 <br /> TPH(Diesel) 50200 50200 23.10 0.240 Ethylbenzene <0.50 <0.50 <0.00050 <0.0005 <br /> Benzene <0.50 <0.50 <0.00050 <0.00050 Oil&Grease NA NA NA NA <br /> Toluene <0.50 <0.50 <0.00050 <0.00050 Heavy Metals Pb<13 <13 NA NA <br /> MTBE <0.050 <0.050 <0.0050 1<0.0050 <br /> Comments: <br /> The soil before and after concentrations are from a sample collected at 30 bsg in soil boring C-4/6, which was completed in <br /> the UST source area. The ground water before and after concentrations are from MW-1 located in the UST source area. <br /> Water contaminant concentrations have declined over time in all of the impacted MWs. Lead (heavy metal)concentration is <br /> from the soil sample collected at the time of UST removal. MTBE in soil and ground water is from is from soil borin B-4. <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: NA <br /> Should corrective action be reviewed if land use changes?Yes <br /> Monitoring/Vapor wells Decommissioned:Yes Number Decommissioned: 7 Number retained: 0 <br /> List enforcement actions taken: NOR sent to the RP <br /> List enforcement actions rescinded: NA <br /> V. Local Agency Representative Data <br /> Name: Donna Heran, REHS Title: Director <br /> Signature: Date:3 <br /> VI. Central Valley Regional Water Quality Control Board RB Notification <br /> Date Submitted to RB: 11/16/2010 Response Date: 12/14/2010 <br /> RB Staff: J. Barton Response: No Further Action Required <br /> Title: Eng. Geologist <br /> VII.Additional Comments, Data, etc. <br /> 11 Site closed with contaminated soil above ground water left in place. <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 />