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ti <br /> 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 I After <br /> TPH(Gas) NA NA NA NA Xylene 0.17 0.17 <.0005 <.0005 <br /> TPH (Diesel) 3600 3600 0.150 <.050 Ethylbenzene 0.17 0.17 <.0005 <.0005 <br /> Benzene 0005 <.005 <.0005 1 <,0005 Oil&Grease NA NA NA NA <br /> Toluene 0005 <.005 <.0005 00005 Heavy Metals NA NA NA NA <br /> MTBE <.005 <.005 NA NA <br /> Comments: 371 tons of contaminated soil was removed before soil borings and MWs were completed outside excavation. <br /> Before and after soil results are from soil boring B10-3 located 5 feet east of excavation, 12 feet bgs. Groundwater results <br /> before and after are from MW#3 located 40 feet downgradient of the south end of the excavation. MW#3 has been ND <br /> since 06128101. No benzene ever detected in soil or groundwater. 1 <br /> i <br /> NA= not analyzed <br /> IV. Closure <br /> i <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 /> MonitoringNapor wells decommissioned:0 Number Decommissioned: 0 Number retained: 3 <br /> List enforcement actions taken: level one. NOR <br /> List enforcement actions rescinded: i <br /> V. Local Agency Representative Data >! <br /> i <br /> Name: Margaret Lagorio 19 Title: Supervising REHSISite Mitigation/LOP Unit IV <br /> Signature: Date: -r/1 t DT, <br /> VI. Central Valley Regional Water Quality Control Board (RB) Notification <br /> Date Submitted'to RB: Response Date: <br /> RB Staff: M. Hartzell Response: <br /> Title: Assoc Eng Geologist <br /> VII. Additional Comments, Data, etc. <br /> Currently soil only case based upon 3 MWs sampled. <br /> This document and the related CASE CLOSURE LETTER, Shall be retained by the lead agency as part of the official <br /> site file. i <br /> l <br />