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Case Closure Summary Paga _ <br /> `{ -Ceaking Underground Fuel torage 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) 12.0 12.0 35.0 6.5 Xylene .490 .490 8.1 1.03 <br /> TPH (Diesel) NA NA NA NA Eth benzene .500 .500 1.3 .521 <br /> Benzene <005. <005. .15 <.006 Oil &Grease NA NA NA NA <br /> Toluene .110 .110 2.7 .09 Heivy Metals <5 <5 NA NA <br /> MT13E <.01 <.01 .12 <.01 <br /> Comments: The Before and After Soil results are from MW-2, located in the former UST area, at 45 feet bgs. MW-2 was <br /> the only well that indicated any soil contamination. The groundwate results are from GMX-1 located down-gradient from the <br /> UST area. <br /> GMX-1 had the highest gasoline concentrations throughout the mor itoring period from 1999 to 2005. <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?Y s <br /> Site management requirements: NA <br /> Should corrective action be reviewed if land use changes? NA <br /> Monitoring/Vapor wells :5 Number Decommissioned: 5 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 List enforcement actions rescinded: NA 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 71t <br /> e: Director of Environmental Health <br /> Signature: ��- �r. Da te: <br /> VI. Central Valley Regional Water Quality Control Board (RB) NotificEition <br /> i <br /> Date Submitted to RB: 8/3/2005 Response Date: 8123105 <br /> RB Staff: J. Barton Response: Concurrence <br /> Title: Eng. Geologist <br /> VII. Additional Comments, Data, etc. <br /> I <br /> Endwater pump and treat system removed 824,626 gallons an gasoline and concentration were significantly <br /> d. <br /> This document and the related CASE CLOSURE LETTER, Shall tie retained by the lead agency as part of the official <br /> site file. <br />