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Case Closure.,Summary <br /> making Underground Fuel Storage Tank Pr�am <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) 1,400 80 0.62 <0.050 Ethylbenzene 32 0.13 <0.0005 <0.0005 <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 /> Toluene 46 0.12 0.0036 <0.0005 1,2-DCA NA NA <0.0005 NA <br /> Lead NA NANA NA <br /> Comments: The 'soil before' concentrations are taken from sample T2N on 9/22/1998. 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 analyzed <br /> IV. Closure <br /> Fcompiteted <br /> ed corrective action protect existing beneficial uses per the Regional Board Basin Plan? Yes <br /> ed corrective action protect potential beneficial uses per the Regional Board Basin Plan? Yes <br /> e action protect public health for current land use? Yes <br /> ent requirements: None <br /> ive action be reviewed if land use changes? Yes <br /> Monitoring/Vapor wells decommissioned: Yes Number Decommissioned: 3 Number retained: 0 <br /> List enforcement actions taken: NOR <br /> List enforcement actions rescinded: None <br /> V. Local AQency Representative Data <br /> Name: Donna Heran, REHS Title: Director <br /> Signature: Date: <br /> -�- 3 7-.2--o F12-- <br /> VI. Central Valley Regional Water Quality Control Board RB Notification <br /> Date Submitted to RB: 07/12/2011 Response Date: 07/28/2011 <br /> RB Staff: James L.L. Barton Response: Concurrence <br /> Title: Associate Engineering Geologist <br /> VII. Additional Comments, Data, etc. <br /> E:: <br /> This document and the related CASE CLOSURE LETTER shall be retained by the lead agency as part of the official site file. <br /> Page 2 <br />