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1 <br /> 1.-" <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) 610 <50 9.9 <0.05 Xylene 39 <1.0 0.30 0.0017 <br /> TPH(Diesel) 23,600 <50 1.1 <0.05 Ethylbenzene 6.5 <0.5 <.025 <0.0005 <br /> Benzene 0.63 <0.5 2.8 0.0054 Oil&Grease NA NA NA NA <br /> Toluene 6.1 <0.5 0.180 <0.0005 MTBE NA NA unk <0.0005 <br /> Comments:The Soil Before Concentrations are from beneath UST-2 when it was removed on 9/28/92, except for the TPH <br /> diesel taken beneath UST-7 when it was removed on 3/14/88. The Soil After Concentrations are from Geoprobe soil <br /> samples collected 4/29/09. The Water Before Concentrations are from MW-2 collected on 5/28/93. The Water After <br /> Concentrations are from MW-2 (currently the only impacted well)on 5/12/09. There has been no documented MTBE at this <br /> site. Site remediation included soil excavation and pump and treat. <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 /> Monitoring/Vapor wells installed: 13 Number Decommissioned: 13 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 List enforcement actions rescinded: NA 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 <br /> Signature: Date: <br /> VI. Central Valley Regional Water Quality Control Board (RB) Notification <br /> Date Submitted to RB: 09/30/2009 Response Date: 10/12/2009 <br /> RB Staff: J. Barton Response: NFAR Concurrence <br /> Title: Eng. Geologist <br /> VII. Additional Comments, Data, etc. <br /> 11 11 <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 />