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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 (ppm) Water (ppm) <br /> Before After Before After Before After Before After <br /> TPH (Gas) 2,100 NA 29 0.36 Xylene 300 NA 5.7 0.0014 <br /> TPH (Diesel) NA NA NA NA Ethylbenzene 47 NA 1.7 0.00089 <br /> Benzene 4.3 NA 0.70 0.00065 Oil &Grease NA NA NA NA <br /> Toluene 61 NA 0.76 0.012 Lead(Pb) 13 NA NA NA <br /> MTBE 126 NA 56 0.0031 <br /> Comments: SOIL BEFORE CONCENTRATIONS: TPH-g, benzene (B), toluene (T), xylene (X), ethylbenzene (E), and <br /> MTBE are from sample T2-5-8' at 8' on 10/22/1998; Pb is from sample L-2-3' at 3'on 11/13/1998. <br /> SOIL AFTER CONCENTRATIONS: No soil results are available. WATER BEFORE CONCENTRATIONS: TPH-g and X <br /> are from MW4R on 6/8/2005; B is from MW4R 6/15/1998; T is from MW4 on 10/17/1997; <br /> E is from MW4R on 1/16/2006; and MTBE is from MW7 on 3/26/2003. WATER AFTER CONCENTRATIONS: all analyte <br /> concentrations are from MW4R collected on 1/7/2013. <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 decommissioned: Yes Number Decommissioned:10 Number retained:0 <br /> List enforcement actions taken: NORs provided to RPs 3/5/1997 and 8/10/2000 <br /> List enforcement actions rescinded: NA <br /> V. Local Agency Representative Data <br /> Name: Donna Heran, REHS Title: Director <br /> Signature: Date: 6/23/2014 <br /> VI. Central Valley Regional Water Quality Control Board RB Notification <br /> Date Submitted to RB: 6/4/2013 Response Date: 6/10/2013 <br /> RB Staff: James L.L.Barton Response: Concurrence <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 />