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s <br /> Case Closure Summary Page 2 <br /> Leaking Underground Fuel Storage Tank Program s <br /> 111 Release and Site Characterization Information (continued) <br /> Maximum Documented Contaminant Concentrations --Before and After Cleanup I <br /> Contaminant Soil (ppm) Water (ppm) Contaminant Sol] (ppm) Water (ppm) <br /> Before After Before After Before After . Before. After <br /> TPH(Gas) 87.0 <1.0 0.270 <0.05 Xylene X0.1 <0.01 0.0276 <0.001 <br /> TPH (Diesel) 28000 130 <0.05 <0.05 Ethylbenzene <0.05 X0.005 0.0023 <0.0005 <br /> Benzene <0.05 <0.005 '<0.0005 <0.0005 Oil &Grease NA NA <1.0 <1.0 6 <br /> Toluene <0.05 <0.005 0.0026 <0.0005 Heavy Metals Pb<5.0 Pb<5.0 NA; NA <br /> MTBE <0.05 <0.05 NA" <0.001 <br /> Comments: <br /> The soil before concentrations are from soil beneath U8T-2.at time of removal in November 2002: The soil after ' <br /> concentrations are from MW 1 drilled on 2120103, except for TPH-g that is.from boring PB2.drilled on 7124102. Soil was <br /> excavated to 20 feet below ground surface (bgs) and the excavation was backfilled with clean soil. After backfilling, a soil <br /> boring was completed near UST-2 and all soil results were ND at 25 and 30 feet bgs. The ground water before <br /> concentrations are from PB2H2O (GeoProbe grab sample)taken near the source area down-gradient of'former USTs on <br /> 7124102. The ground water after concentrations are from the 3 MWs installed around the source area, coilected 1018103. <br /> The 3 MWs are within 50 feet of the former USTs. <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 /> 1 4 <br /> Site management requirements: NA <br /> Should corrective action be reviewed if land use changes?YES i <br /> Monitoring/Vapor wells decommissioned: YES Number Decommissioned: 3 Number retained: 0 ` <br /> List enforcement actions taken: NOR SENT TO RP <br /> List enforcement actions rescinded:NA <br /> V. Local Agency Representative Data <br /> Name: Donna Heran Title: Director of Environmental Health <br /> Signature: Date: <br /> VI. Central Valley Regional Water Quality Control Board RB Notification <br /> Date Submitted to RB: 5113109 Response Date: 5119109 <br /> RB Staff: James Barton Response: Concurrence <br /> Title: Eng. Geologist' <br /> VII. Additional Comments, Data, etc. <br /> This document and the related CASE CLOSURE LETTER, Shall be retainedby the lead agency as part of the official y <br /> site file. <br /> R <br />