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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 Cleanup7777777= <br /> m Water (ppm} Contaminant Soil (ppm) 7AN <br /> ) <br /> Contaminant Soil (ppm) Before After .Before After Before After. . NA 005TPH (Gas) 1,60q NA 150 <q.050 Ethylbenzene 340.18 NA Xylenes 190 NA 00BTPH (Diesel) 7,900 NA X0.0005 MTBE 27 NA 01Benzene 15 NA 2:0 NA Toluene 95 NA 0.24 <O.00gS . 1,2-DCA NALead NA NA <br /> Comments: The`Soil Before' concentrations for TPH,g, toluene, ethylbenzene, and xylenes are from sample T.1A @ 15 <br /> feet on 03129195, benzene from B2-S3 @ 18.6 feet.on 11127195, MTBE from CPT-1 @ 35 feet on 06111103, and TPH-d from <br /> stockp7ile composite SP91SP101SP11 on 05/06/99-. `Soil After' concentrations were not collected. <br /> The `Groundwater Before' concentrations for TPH-g, MTBE, and.1,2-DCA are from MW-1 an 06106108, TPH-d from CPT- <br /> 5-a on 06113103, benzene from MW-1 on 0r PH 8, toluene and ethylbenzene from CPT-1-108' on 06111103, xylenes from <br /> MW-3 on 04127199. The `Groundwater After' concentrations are taken from MW-1 on 03110111. NA—not analyzed <br /> f IV. Closure <br /> FDoescormnpleted <br /> ted corrective action protect existing beneficial uses per the Regional Board Basin Plan? Yes <br /> corrective action protect potential beneficial uses per the Regional Board Basin Plan? Yes <br /> ve action protect public health for current land use? Yes <br /> G <br /> Site management requirements: None <br /> Should corrective action be reviewed if land use changes? Yes <br /> Monitoring/Vapor wells decommissioned: Yes Number Decommissioned: 12 Number retained: 0 <br /> List enforcement actions taken: NOR <br /> I <br /> List enforcement actions rescinded: None <br /> V. Local Agency Representative resentative Data <br /> Name: Donna Heran, REHS Title: Director <br /> Signature: Date: March 25, 2013 <br /> 4 <br /> V1 Central Valley Regional Water Quality Control Board RB Notification <br /> i <br /> Date Submitted to RB: June 8,2012 Response Date: June 27, 2012 <br /> I RB Staff: James L.L. Barton Response: No Further Action Required Concurrence <br /> Title: Associate Engineering Geologist <br /> VI1. Additional Comments, Data, etc. . <br /> SVE/IAS remediation took place between April 20.08 and December 2010. <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 />