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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) 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 TPH diesel is <br /> from soil beneath UST-7 when it was removed on 3/14/88. The Soil After concentrations are from geoprobe soil samples <br /> collected 4/29/09. The Water Before concentrations are from MW-2 on 5/28/93. The Water After concentrations are from <br /> MW-2 (currently the only impacted well)on 5/12/09. There has been no documented MTBE at this site. Site remediation <br /> included soil excavation and pump and treat. Soil vapor levels are acceptable for commercial property. <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:Yes Number Decommissioned: 3 Number retained: 10 <br /> List enforcement actions taken: NOR sent to RP. <br /> List enforcement actions rescinded: NA <br /> V. Local Agency Representative Data <br /> Name: Margaret Lagorio Title: Program Coordinator <br /> Signature: Date: -1126 / U <br /> VI. Central Valley Regional Water Quality Control Board (RB) Notification <br /> Date Submitted to RB: Response Date: <br /> RB Staff: J. Barton Response: <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 /> site file. <br />