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i <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) "A7 <br /> Contaminant Soi! (ppm) Water fpp ) Before After Before After Before After <O.D1 TPH(Gas) 870 <5 0.590 <Q.05 Xylene 4.2<q 2 <.005 TPH(Diesel) 14,000 8100 440 3.6 Ethylbenzene Benzene <1.2 <pADS <0.0005 <0.0005 Oil &Grease NA NA <br /> Toluene 1.3 <0.005 <0,0005 <0.0005 Heavy Metals NA NA NA NA <br /> MTBE <0.1 <.005 <.002 NA <br /> Comments: The Soil Before concentrations are from MW 2 at 20 feet below surface. The Soil After concentrations are from <br /> an excavation sample (EXE-East)taken at 28 feet bsg after approximately 1200 cubic yards of soil were removed except <br /> TPH gas is from MW 12. The Water Before concentrations are from MW 2 on 8111105 before it was destroyed, except the <br /> MTBE is from MW2 on 8115198. The Water After concentrations for TPH are from MW 3 on 315109 and the BTEX <br /> concentrations are from MW3 on 6119108. <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 /> MonitoringNapor wells decommissioned: Yes Number Decommissioned: 11 Number retained: 0 <br /> List enforcement actions taken: First level; NOR sent to RPs. <br /> List enforcement actions rescinded: None <br /> V. Local Agency Representative Data <br /> Name: Donna Heran, REHS Title: Director <br /> Signature: r r� Date: 3—'g—U <br /> VI. Central Valley Regional Water Quality Control Board RB Notification <br /> Date Submitted to RB: Oct. 8, 2009 Response Date: Oct. 30, 2009 <br /> RB Staff: J. Barton Response: NFAR Concurrence <br /> Title: Eng. Geologist <br /> Vil. 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 />