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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 /> Contaminant Soil (ppm) Water (ppm) Contaminant Soil (ppm) Water (ppm) <br /> Before After Before After Before After Before After <br /> TPH (Gas) 870 <5 0.590 <0.05 Xylene 4.2 <0.01 <0.0005 <0.0005 <br /> TPH (Diesel) 44,000 8100 440 3.6 Ethylbenzene <1.2 <.005 <0.0005 <0.0005 <br /> Benzene <1.2 <0.005 <0.0005 <0.0005 Oil &Grease NA NA 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 MW12. 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 TPN are from MW 3 on 315109 and the BTEX <br /> concentrations are from MW3 on 6119108. <br /> IV. Closure <br /> t 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 i <br /> Site management requirements: None <br /> n <br /> Should corrective action be reviewed.if land use changes?Yes <br /> I' <br /> Monitoring[Vapor 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 List enforcement actions rescinded: None 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: Date: <br /> VI. Central Valley Regional Water Quality Control Board RB Notification <br /> Date Submitted to RB: Oct. 8, 2009 Response Date: Oct. 30, 2009 d <br /> f <br /> RB Staff: J. Barton Response: NFAR Concurrence <br /> Title: Eng. 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 /> k site file. <br /> is <br />