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.y <br /> 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 /> m Contaminant Soil (ppm) Water (ppm) <br /> Contaminant Soilf(A <br /> Water (Ppm) Before After Before After <br /> BeforeBefore After <U 0005 <br /> TPH (Gas) 830114 <.05 Xylene 3.90 3.90 2.92 <0.0005 <br /> TPH (Diesel) <1.016Q 1.070 Ethylbenzene 3.80NA° NANA <br /> Benzene <0.50.735 <0.0005 Oil &Grease NA <br /> Toluene <0.515.50 <0.0005 Heavy Metals 7.70 Pb 7.70 Pb 0.048 Pb NA <br /> MTBE Unk Unk 15.10 0.0006 <br /> Comments: The soil before and the soil after concentrations are from sample TB-2 {the source area) taken at 12.5 feet bgs <br /> at the time of UST removals. The ground water before and the ground water after concentrations are from MW4 located <br /> within 10 feet of the tank pit and TB-2 (the source area). <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: NIA <br /> Should corrective action be reviewed if land use changes? Yes <br /> MonitoringNapor wells decommissioned: Yes Number Decommissioned: 4 Number retained: 0 <br /> List enforcement actions taken: Level One, NOR sent to the RP <br /> List enforcement actions rescinded: None <br /> V. Local Agency Representative Data <br /> Name: Donna Reran, RENS Title: Director <br /> Signature: Date: 1 -3o—lo <br /> Vl. Central Valley Regional Water ualit Control Board (RB) Notification <br /> Date Submitted to RB: July 9, 2010 Response Date: July 19, 2010 <br /> RB Staff: J. Barton Response: <br /> Title: Eng. Geolo ist Concurrence <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 />