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Case Closure Summary Page 2 <br /> 'Leaking Underground Fuel Storage Tank Pam <br /> g <br /> I <br /> 111. 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 /> TPM(Gas) 150 ' 7.0 . 3.4 Xylenes 5.5 0.52 0:033 <br /> TPI(Diesel) NA NA NA MTBE <0.010 <0.0005 <0.0010 <br /> Benzene <0.10 0.011 0.0029 1;2-DCA NA 0.0049 0.00059 <br /> [Toluene 0.18 <0.010 <0.001 EDB NA <0.0005 NA <br /> Ethylbenzene 1.8 1 10.77 10.24 <br /> Comments: Soil Before concentrations are taken from GP-1 at 15.5 feet bsg collected on 08116101. Soil After data are Rot ' <br /> available since remediation was not performed and confirmation soil samples were not collected. Water Before <br /> concentrations are taken from MW-3 collected on 03/16/06 except MTBE and 1,2-DCA concentrations are taken from MW-3 <br /> collected on 12122105, and EDB concentrations are taken from MW-3 collected on 12128104. Water After concentrations are <br /> taken from MW-3 collected on 12122110. NA--not analyzed . <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 Pian? 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 decommissioned: Yes Number Decommissioned: 5 Number retained: 0 <br /> List enforcement actions taken: NOR <br /> List enforcement actions rescinded: None <br /> V. Local Agency Representative Data <br /> Name: Donna Heran, REHS Title: Director <br /> Signature: Date: July 6, 2012 . <br /> VI. Central Valley Regional Water Quality Control Board (RB)Notification <br /> Date Submitted to RB: November 10, 2011' Response Date: December 2, 2011 <br /> RB Staff: James Barton, PG Response: Concurrence <br /> Title: Engineering Geologist <br /> VII. Additional Comments, Data, etc. <br /> This document and the CASE CLOSURE LETTER shall be retained by the lead agency as part of the official site file. <br />