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• n <br /> Case Closure Summary Page 2 <br /> Leaking Underground Fuel S orage 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 (ppm) Water (ppm) <br /> Before After Before After I Before After Before After <br /> TPH (Gas) 7,600 NA 4.9 0.78 Xyl nes 780 NA 1.0 0.055 <br /> TPH (Diesel) NA NA NA NA MT 3E <0.5 NA <0.002 NA <br /> Benzene <0.25 NA 0.39 0.13 1,2 DCA <0.5 NA 0.36 <0.0005 <br /> Toluene 21 NA 0.87 <0.001 Me hanol <200 NA <0,5 NA <br /> Ethylbenzene 82 NA 0.25 0.12 Eth anol <100 NA <0.25 NA <br /> ED <1.0 NA <0.002 NA <br /> Comments: Soil Before concentrations are taken from CPT boring " B-1 at 21.5 feet bsg on July 19, 2001; Soil After data <br /> are not available since confirmation samples were not collected. Wiilter Before concentrations for gas, BTEX, MTBE, and <br /> EDB are taken from MW-1 on 09127107; and 1,2-DCA, methanol, an J ethanol from MW-1 on 10131/05. Water After <br /> concentrations are taken from MW-1 on 11117/09. NA--not an z d <br /> IV. Closure <br /> Does completed corrective action protect existing beneficial uses pe^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 /> Monitoring/Vapor wells decommissioned: No Number Decommissioned: 0 Number retained: 9 <br /> List enforcement actions taken: NOR <br /> List enforcement actions rescinded: None <br /> V. Local Agency Representative Data <br /> Name: Adrienne Ellsaesser, REHS Tit] : Acting Program Coordinator <br /> Signature: umDa e: <br /> VI. Central Valley Regional Water Quality Control Board (RB) Notification <br /> Date Submitted to RB: Re 3ponse Date: <br /> RB Staff: Re ponse: <br /> Title: <br /> VII. Additional Comments, Data, etc. <br /> This document and the CASE CLOSURE LETTER shall be retained by the lead agency as part of the official site file. <br />