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Case Closure Summary <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 Before (ppm) Water (ppm) ContaminantSoil Before (ppm) Water (ppm) <br /> After Before After After Before After <br /> TPH (Gas) 14,000 650 170 2.6 Xylenes 1,200 16.6 20 0.0211 <br /> TPH (Diesel) NA NA NA NA Ethylbenzene 0.11 2.4 4,6 0.0025 <br /> Benzene 89 0.91 23 <0.0005 Oil&Grease NA NA NA NA <br /> Toluene 800 1.0 40 <0.0005 Heavy Metals NA NA NA NA <br /> MTBE 0.0088 <0.005 0.69 <0.001 <br /> Comments: Soil Before: TPH(Gas), benzene, toluene, xylene, and ethylbenzene are from soil boring BT-16 at 16 feet bgs <br /> on 6/29.1994;and MTBE is from VW1-20 at 20 feet bgs on 11/24/1999. Soil After: TPH(Gas), benzene, toluene, xylene, <br /> ethylbenzene and MTBE are from soil boring 134-25 at 25 feet bgs on 5/2/2007. Water Before: TPH (Gas) is from MW-2 on <br /> 12/11/1995; benzene is from MW-2 on 10/28/1994; toluene is from MW-2 on 3/12/1996; xylene is from MW-2 on 9/11/1996; <br /> ethylbenzene is from MW-4A on 9/16/1998; and MTBE is froMW-2 on 9/16/1998. Water After: All analyte concentrations <br /> are from MW-2 on 5/26/2006. <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/Vaporwells decommission: Yes Number Decommissioned: 1(EW) Number retained:19 <br /> List enforcement actions taken: NOR sent to RP on 4/11/1994. <br /> List enforcement actions rescinded: None <br /> V. Local Agency Representative Data <br /> Name: Adrienne Ellsaesser, REHS Title: Program Coordinator <br /> Signature: Date: <br /> VI. Central Valley Regional Water Quality Control Board RB Notification <br /> Date Submitted to RB: Response Date: <br /> RB Staff: J. Barton Response: No Further Action Required 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 site file. <br /> Page 2 <br />