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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 /> F(Diesel) <br /> t Soil (ppm) Water (ppm) Contaminant Soil (ppm) Water (ppm) <br /> Before After Before After Before After Before After <br /> NA Xylene 0.17 0.17 <.0005 00005 <br /> NA NA NA <.0005 <.0005 <br /> <.050 Eth benzene 0.17 0.17 <br /> 3600 3600 0.150 yl<.005 <.005 <.0005 <000S Oil&Grease NA NA NA NA <br /> <.005 <.005 <.0005 <.0005 Heavy Metals NA NA NA NA <br /> MTBE <.005 <.005 NA NA <br /> LL= not <br /> 371 tons of contaminated soil was removed before soil borings and MWs were completed outside excavation. <br /> fter soil results are from soil boring B10-3 located 5 feet east of excavation, 12 feet bgs. Groundwater results <br /> fter are from MW#3 located 40 feet downgradient of the south end of the excavation. MW#3 has been ND <br /> 1. No benzene ever detected in soil or groundwater. <br /> lyzed <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: notify EHD when land use changes <br /> Should corrective action be reviewed if land use changes? yes <br /> Monitoring/Vapor wells decommissioned:yes Number Decommissioned: 3 Number retained: 0 <br /> List enforcement actions taken: level one. NOR <br /> 11 List enforcement actions rescinded: <br /> V. Local Agency Representative Data <br /> Name <br /> Donna Heran <br /> Title: Director of Environmental Health <br /> Signature: Date: 3o—t <br /> Vi. Central Valley Regional Water Quality Control Board (RB) Notification <br /> [FRB <br /> te Submitted to RB: September 20, 2002 Response Date: October 2, 2002 <br /> f Staff: M. Hartzell Response: Concurrence that no further actioh is required <br /> e: Assoc Eng Geologist <br /> VII. Additional Comments, Data, etc. <br /> soil only case <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 />