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Case Closure Summary <br /> Leaking Underground Fuel Storage Tank Program <br /> 111. Release and S to 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) 6,000 NA 8.4 2.2 Ethylbenzene 71 NA 0.210 0.026 <br /> TPH (Diesel) 6,600 NA 33 2.1 Xylenes 310 NA 0.270 0.033 <br /> TPH(Motor Oil) 18,000 NA <1.2 NA MTBE 0.22 NA <0.002 NA <br /> Benzene <0.10 NA 0.069 0.037 1,2-DCA <0.10 NA <0.0005 NA <br /> Toluene 2.1 NA 0.016 0.0074 Lead 790 NA NA NA <br /> Comments: The 'Soil Before' concentrations for TPH (gas), ethylbenzene and xylenes are from sample S67-20 @ 20 feet <br /> on 09108106, TPH (diesel)from MW6-25 @ 25 feet on 05106110, TPH (motor oil), benzene and 1,2-DCA from South TK-8' @ <br /> 8 feet on 04/29/03, toluene from MW5-35 @ 35 feet on 05106110, MTBE from SB3-6.0 @ 6 feet on 05105104, and lead from <br /> dispenser @ 2 feet on 04129103. 'Soil After'concentrations were not collected. The 'Groundwater Before' concentrations <br /> for TPH (gas) are from MW4 on 09107106, TPH (diesel)from 5611-36 on 09128106, TPH (motor oil) and benzene are from <br /> MW-5 on 05128110, toluene from MW-4 on 05128109, ethylbenzene, xylenes and MTBE are from MW-4 on 05125107, and <br /> 1,2-DCA from MW-4 on 08129108. The'Groundwater After'concentrations for TPH (gas), TPH (diesel), toluene, <br /> eth (benzene, and xylenes are from MW-4 on 05118111, and benzene from MW-5 on 05118111. NA—not anal zed <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 Plan? Yes <br /> Does corrective action protect public health for current land use? Yes <br /> Site management--equirements: None <br /> Should corrective action be reviewed if land use changes? Yes <br /> Monitoring/Vapor wells decommissioned: Yes Number Decommissioned: 11 Number retained: 0 <br /> List enforcement actions taken: Notice of Responsibility on 11/04/03 <br /> List enforcement actions rescinded: None <br /> V. Local Agency Representative Data <br /> Name: Donna Heran, REHS Title: Director f <br /> Signature: Date: October 7, 2013 <br /> VI Central Valley Regional Water Quali Control Board RB Notification <br /> Date Submitted to RB: September 13, 2012 Response Date: October 11, 2012 <br /> RB Staff: James L_'-, Barton Response: Concurrence <br /> Title: Associate Engineering Geologist <br /> VII.Additional Comments, Data, etc. <br /> Active remediation did not take place at this site. <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 />