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%woe <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 After <br /> TPH (Gas) 87.0 <1.0 0.270 <0.05 Xylene <0.1 <0.01 0.0276 <0.001 <br /> TPH (Diesel) 28000 130 <0.05 <0.05 Ethylbenzene <0.05 <0.005 0.0023 <0.0005 <br /> Benzene <0.05 <0.005 <0.0005 <0.0005 Oil &Grease NA NA <1.0 <1.0 <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 UST-2 at time of removal in November 2002. The soil after <br /> concentrations are from MW1 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, collected 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 /> Site management requirements: NA <br /> Should corrective action be reviewed if land use changes?YES <br /> Monitoring/Vapor wells decommissioned: NO Number Decommissioned: 0 Number retained: 3 <br /> List enforcement actions taken: NOR SENT TO RP <br /> List enforcement actions rescinded: NA <br /> V. Local Agency Representative Data <br /> Name: Margaret Lagorio Title: Program Coordinator <br /> Signature: Date: y O Q <br /> VI. Central Valley Regional Water.Quality Control Board R8 Notification II <br /> Date Submitted to RB: Response Date: <br /> RB Staff: James Barton Response: <br /> Title: 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 />