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Case Closure Summary <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 (ppmJ Water (pprn) <br /> Before After Before After Before After Before After <br /> TPH (Gas) 66 NA 41 <0.050 Ethylbenzene 0.15 NA 0.67 <0.0005 <br /> TPH (Diesel) NA NA NA NA Xylenes 1.6 NA 6.2 "0" <br /> Benzene 0.035 NA 0.6 <0.0005 MTBE 0.05 NA 0.22 <0.0005 <br /> Toluene 0.18 NA 2.0 <0.0005 1,2-DCA <0.005 NA 0.35 0.11 <br /> Lead 17.2 NA NA NA <br /> Comments: The `soil before' concentrations for TPH( as are from P1-50 @ 50' (01125199); benzene and xylenes are from <br /> B1 (MW1) @ 65' (02/25/99); toluene, ethylbenzene, and MTBE are from B1 (MW1) @ 70' (02/25199)-1 1,2-DCA from MW4 <br /> @ 70' (06109105) and lead from P2-10 @ 10' (01102100). There is no 'soil after' data. The `groundwater before' <br /> concentrations for TPH(Gas) are from MW2 (03111199); benzene and xylenes are from MW3 (03/11199); toluene from B5 <br /> (03105199); ethylbenzene from B1 (02125199); MTBE from MW3 (03127103); and 1,2-DCA from MW3 (2004-2005). The <br /> "groundwater after" concentrations for TPH(Gas) and BTEX are from MW3 (03130/10); MTBE from MW3 (09126108); and <br /> 1,2-DCA from MW-1 (03130110) NA—not analyzed. <br /> 1V. 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 /> MonitoringNapor wells decommissioned: Yes Number Decommissioned: 10 monitoring wells Number retained: 0 <br /> and 5 soil vapor wells <br /> List enforcement actions taken: NOR <br /> ristnforcement actions rescinded: None <br /> V. Local Agency Representative Data <br /> Name: Donna Heran, REHS Title: Director <br /> Signature: Date: November 2, 2012 <br /> VI. Central Valley Re ional Water Quality Control Board RB Notification <br /> Date Submitted to RB: April 17, 2012 Response Date: April 27, 2012 <br /> RB Staff: James L.L. Barton Response: Concurrence <br /> Title: Associate Engineering 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 site file. <br /> Page 2 <br />