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5 <br /> Case Closure Summary Page' <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 1(ppm) Water (ppm) <br /> Before After Before After Before After Before After <br /> TPH (Gas) 12000 560 12 <2 Xylene 1500 <0.05 1.9 <0.04 <br /> TPH(Diesel) NA NA NA NA Ethylbenzene 230 <0.05 0.5 <0.02 <br /> Benzene 26 <0.05 1.0 <0.02 Oil &Grease NA NA NA NA <br /> Toluene 970 <0.05 2.4 <0.02 MTBE NA 0.1 1.8 0.052 <br /> 1,2-DCA NA <0.05 0.037 0.012 <br /> Comments: Soil Before concentrations are from boring for MW1 at 16 feet below grade. Soil After concentrations are from <br /> CPT-1 A at 10 feet below grade after remediation. Groundwater Before concentrations are from VW-21D (flooded vapor well) <br /> (TPH & BTEX on 5/15197, MTBE on 8113197, 1,2-DCA on 11112/99). Groundwater After concentrations are from MW5 on <br /> 12115105. Public Participation requirements in Section 2728 of the California Code of Regulations has been met. <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 requirements: None <br /> Should corrective action be reviewed if land use changes?Yes <br /> MonitoringNapor wells installed: 13 Number Decommissioned: 0 Number retained: 13 <br /> List enforcement actions taken: NOR sent to RP. <br /> List enforcement actions rescinded: NA <br /> V. Local Agency Representative Data <br /> Name: Margaret Lagorio Title: REHS, Program Coordinator Unit IV <br /> Signature: Date: <br /> VI. Central Valley Regional Water Quality Control Board (RB) Notification <br /> Date Submitted to RB: Response Date: <br /> RB Staff: James Barton Response: <br /> Title: 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 <br /> site file. <br />