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Case Closure Summary Page 2 <br /> L.,dking Underground Fuel Storage Tank Prod <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) 8400 <1.0 15.0 <0.05 Xylene 750 <0.005 1.2 <0.0005 <br /> TPH (Diesel) NA NA NA NA Ethylbenzene 100 <0.005 .270 <0.0005 <br /> Benzene 15 <0.005 1.2 <0.0005 Oil &Grease NA NA NA NA <br /> Toluene 150 <0.005 <.5 <0.0005 MTBE 23 <0.005 15.0 <0.0005 <br /> Comments: The soil before concentrations are from sample 3-EXC at 14 feet bgs in the excavation at time of UST removal. <br /> The soil after concentrations are from confirmation samples CB-1, CB-2, CB-3 and CB-4 collected after remediation. The <br /> ground water before concentrations are from S-1 (remedial sparge well in source area)on 6/28199 and the after ground <br /> water concentrations are from MW-8 located nearest and down-gradient of the source area on 5123108. No EDB or 1,2- <br /> DCA, were reported at this site. <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 /> Monitoring/Vapor wells installed: 14 Number Decommissioned: 1 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 List enforcement actions rescinded: NA 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: Donna Heran, REHS Title: Director <br /> Signature:, Date: <br /> VI. Central Valley Regional Water Quality Control Board (RB) Notification <br /> Date Submitted to RB: 12/09/09 Response Date: 01/09/09 <br /> RB Staff: J. Barton Response: CONCURRENCE <br /> Title: Eng- Geologist <br /> VII. Additional Comments, Data, etc. <br /> F_ <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 />