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Case Closure Summary <br /> Leaking Underground Fuel Storage Tank Program <br /> Ill. 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) 3,400 NA 44 <0.050 Ethylbenzene 19 NA 1.5 <0.0005 <br /> TPM(Diesel) NA NA NA NA Xylenes 430 NA 5.6 <0.0006 <br /> Benzene 21 NA 5.0 <0.0005 MTBE 770 NA 130 <0.001 <br /> Toluene 320 NA 7.2 <0.0005 1,2-DCA <0.005 NA 0.015 <0.0005 <br /> Lead 8.5 NA NA NA <br /> Comments: The `Soil Before' concentrations for TPH (gas), benzene, toluene, xylenes and MTBE are from sample L1 @ <br /> 2.5 feet on 10/31196, ethylbenzene from B4-5 @ 5 feet on 06124198, 1,2-DCA from MW-9 @ 10 feet on 03/23101, and lead <br /> from T2N and T2S @ 9 feet on 10/31196. `Soil After' concentrations were not collected. The `Groundwater Before' <br /> concentrations for TPN (gas) are from MW-7 on 12/02/99 and 08128104, benzene and MTBE from MW-7 on 12108100, <br /> toluene, ethylbenzene, and xylenes from MW-7 on 12102199, and 1,2-DCA from MW-7 on 01102107. The 'Groundwater <br /> After' concentrations for TPH (gas)and MTBE are from MW-7 on 03/09/11, and benzene, toluene, ethylbenzene, xylenes, <br /> and 1,2-DCA are from MW-7 on 11125108. NA—not analyzed <br /> IV. Closure <br /> Does completed corrective action protect existing beneficial uses per the Regional Board Basin flan? 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: 23 Number retained: 0 <br /> List enforcement actions taken: Notice Of Responsibility on 01/16/98 <br /> List enforcement actions rescinded: None <br /> V. Local Agency Representative Data <br /> Name: Donna Heran, REHS Title: Director <br /> Signature: L+� Date: May 15, 2013 <br /> VI Central Valley Regional Water Quality Control Board RB Notification <br /> Date Submitted to RB: September 07, 2012 Response Date: October 18, 2012 <br /> RB Staff: James L.L. Barton Response: Concurrence <br /> Title: Associate Engineering Geologist <br /> VII. Additional Comments, Data, etc. <br /> Ozone injection totaled 24,255 hours between 01 June 2004 and 14 July 2009. <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 />