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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) 2400 2400 0.059 <0.05 Xylene 230 230 0.0016 <0.05 <br /> TPH (Diesel) 9900 9900 <0.05 <0.05 Ethylbenzene 39 39 <0.0005 <0.0005 <br /> Benzene 0.68 0.68 0.0012 <0.0005 Oil &Grease na na na na <br /> Toluene <0.5 <0.5 0.0051 <0.0005 Heavy Metals lead 12 12ppm na na <br /> MTBE junk junk 1 <0.00050 <0.0005 <br /> Comments: Soil analytical results before and after are from the base of the tank excavation after sail removal on 10/18/93 <br /> (T11-K). Groundwater results before are from MW#4 (shallow well) after well installation on 4113187. Groundwater after <br /> results are from MW4 on 911199. <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: na <br /> Should corrective action be reviewed if land use changes? no <br /> Monitoring/Vapor wells decommissioned:no Number Decommissioned: 0 Number retained: 10 <br /> List enforcement actions taken: level one, NOR sent to RPs <br /> List enforcement actions rescinded:na <br /> V. Local Agency Representative Data <br /> Name: Margaret Lagorio— ---]Title: Supervising REHSISite Mitigation/LOP Unit IV <br /> Signature: Date: '? ILI 03 <br /> %-.,, L"n�a� <br /> VL Central Valley Regional Water Quality Control Board (RB) Notification <br /> Date Submitted to RB: Response Date: <br /> RB Staff: J. Barton Response: <br /> Title: Assoc Eng 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 />