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Case Closure Summary Page 2 <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) 12,000 48 2.4 Xylene 1,400 4.7 <0.001 <br /> TPH (Diesel) 1,560 NA NA Ethylbenzene 120 0.72 0.0016 <br /> Benzene 3.8 3.0 <0.001 Oil &Grease NA NA NA <br /> Toluene 96 3.2 <0.001 Heavy Metals NA NA NA <br /> MTBE NA 0.62 <0.001 <br /> Comments: <br /> The soil before concentrations are from sample (DSP-1-4)taken at 4 feet bsg during dispenser upgrade activities on <br /> June 8, 1995; no post remediation "after" soil samples were collected. The before and after ground water concentrations are <br /> from MW-4, the most contaminated well, which is located down-gradient of the dispenser island and up-gradient of the <br /> former USTs. <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: NFAR <br /> Should corrective action be reviewed if land use changes?Yes <br /> Monitoring/Vapor wells Decommissioned: Yes Number Decommissioned: 15 Number retained: 0 <br /> List enforcement actions taken: NOR sent to RPs <br /> List enforcement actions rescinded: NA <br /> V. Local Agency Representative Data <br /> Name: Donna Heran, REHS Title: Director <br /> Signature: Date: <br /> VI. Central Valley Regional Water Quality Control Board RB Notification <br /> Date Submitted to RB: Response Date:9/15/2012 <br /> RB Staff: J. Barton Response: No Further Action Required Concurrence <br /> Title: Engineering Geologist <br /> VII. Additional Comments, Data, etc. <br /> There were two LOP Cases at this site. The LOP Site Codes 18971 and 0001718. <br /> This document and the related CASE CLOSURE LETTER shall be retained by the lead agency as part of the official site file. <br />