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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 /> Water (ppm) Contaminant �32 <br /> l (ppm) Water (ppm) <br /> Contaminant Soil (ppm} ore After Before After <br /> Before After Before After <0.0005 <0.0005 <br /> TPH(Gas) 1,400 80 0.62 <0.050 Ethylbenzene 0.13 <br /> TPH(Diesel) NA NA NA NA Xylenes 190 1.0 0.0088 <0.0005 <br /> Benzene 4.3 <0.005 <0.0005 <0.0005 MTBE 39 0.31 0.52 0.0060 <br /> <0.0005 1,2-DCA NA NA <0.0005 NA <br /> Toluene 46 0.12 0.0036 Lead NA NA NA NA <br /> Comments: The 'sail before' concentrations are taken from sample T2N on 912211998. The 'soil after' concentrations are <br /> taken from sample North East (north wall east end)on 11/10/1998. The groundwater before and after concentrations are <br /> taken from MW-1 on 05/17/2006 and 06/16/2010, respectively. NA—not anal ed <br /> 1V.Closure <br /> FDoes <br /> pleted corrective action protect existing beneficial uses per the Regional Board Basin Plan? Yes <br /> pleted correctiveaction protect potential beneficial uses per the Regional Board Basin Plan? Yes <br /> ective 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 decommissioned: No Number Decommissioned: 0 Number retained: 3 <br /> List enforcement actions taken: NOR <br /> List enforcement actions rescinded: None <br /> V. Local Agency Representative Data <br /> Name: Adrienne Ellsaesser, REHS Title: Acting Program Coordinator <br /> Signature- III Date: /;Z /�� <br /> —10 <br /> VI. Central Valley Regional Water Quality Control Board (RB) Notification <br /> Date Submitted to RB: Response Date: <br /> t <br /> RB Staff: James L.L. Barton Response: <br /> Title:Associate Engineering 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 />