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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(�) 500 350 80 3 Ethylbenene 4 11 .21 .028 <br /> TPH(Diesel) 1100 160 66 9.6 Xylene 48 11 .54 .360 <br /> Berne 5.3 .082 .870 .0018 NA .024 <br /> Toluene 23 .92 .760 .0021 MTBE <br /> rafter <br /> ents: The soil before concentrations are from soil samples collected at the time the tanks were removed. The soil <br /> oncentrations are from a sidewall sample after the August 1993 excavation of contaminated soil. Groundwater <br /> ntrations before are from MW1 on 1/9/90. Groundwater concentrations after are from MW1 on 7/2/97. <br /> NA(not analyzed) <br /> IV.Closure <br /> F <br /> ted corrective action protect existing beneficial uses per the Regional Board Basin Plan? Yes <br /> ted corrective action protect potential beneficial uses per the Regional Board Basin Plan? Yes <br /> oescive 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: 4 Number retained: 0 <br /> List enforcement actions taken: NOR 8/10/89 <br /> List enforcement actions rescinded: <br /> V. Local Agency Representative Data <br /> Name: Donna Heran Title: Director of Environmental Health <br /> Signature: Date: 1,2--1( _y <br /> VI. Central Valley Regional Water Quality Control Board(RB) Notification <br /> Date Submitted to RB: 10/27/97 Response Date: 11/24/97 <br /> RB Staff: P.Anderson Response: Concurrence <br /> Title:Hydrogeologist <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 /> r �� <br />