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CASE CLOSURE SUMMARY Page 2 <br /> Leaking Underground Storage Tank Program <br /> V. Treatment/Disposal Methods Attach any additional information <br /> Material Amount(Include Action(Treatment or Disposal Method) Date <br /> Units) <br /> Tanks 6,000 gallon UST Removed Jan-1999 <br /> 1,000 gallon UST Removed Jan-1999 <br /> Piping NA <br /> Free Product NA No Free Product Encountered <br /> Soil 10,403 tons Disposed of at Forward Landfill Jan-2006 <br /> Ground Water NA <br /> Maximum Documented Contaminant Concentrations—Before and After Cleanup <br /> Contaminant Soilm Contaminant <br /> ( g/kg) Water(µg/L) Soil(mglkg) Water(µg/L) <br /> Before After Before After Before After Before After <br /> TPH(Gas) <1.0 0.31* 12,000 <50 1,2-DCA NA NA qNA <br /> 3.3 <br /> TPH(Diesel) 22,000 410* 94,000 170 Oil&Grease NA NA NA <br /> Benzene <1.2 <0.0049 28 <0.50 Lead NA NA NA <br /> Toluene <1.2 <0.0049 22 <0.50 MTBE <50 1.9 <50 <0.50 <br /> Ethylbenzene 1 16 <0.0049 550 <0.50 TBA NA NA <5.0 <4.0 <br /> Xylenes 61 <0.0099 2400 <0.60 Other <br /> Comments: *Sample was collected at the approximate depth of the soil-groundwater interface and is likely more <br /> representative of current groundwater conditions at that location. <br /> VI. Closure <br /> Does completed corrective action protect existing beneficial uses per the Basin Plan? yes <br /> Does completed corrective action protect potential beneficial uses per the Basin Plan? yes <br /> Does corrective action protect public health for current land use?yes <br /> Site Management Requirements: <br /> Should corrective action be reviewed if land use changes?yes <br /> ber Destroyed:4(2005) Number Retained: 3 <br /> Monitoring Wells Destroyed?Some TNum <br />