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! L %VM4 <br /> Case Closure Summary Page 2 <br /> Leaking Underground Fuel Storage Tank Program <br /> !fl 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 <br /> Before After Before After <br /> TPH (Gas) <1.0 <1 0.270 NA Ethylbenene <0.025 <.005 <0.0005 NA <br /> TPH(Diesel) <1.0 1.1 0.079 NA Xylene <0.025 <.005 <0.0005 NA <br /> Benzene <0.025 <.005 <0.0005 NA MTBE 2.1 <.005 <0.0005 NA <br /> Toluene <0.025 <.005 <0.0005 NA Ethanol <2 <.010 0.043 NA <br /> Dodecane NA NA 0.0056.1 NA Chloroform NA NA 0.260 NA <br /> Comments: Soil Before results are from soil beneath the Regular fill bucket on 1130104. Soil After results for TPH diesel are <br /> from soil boring B-2-7@36' collected on 10120104, all other soil samples collected at that time at various depths were non- <br /> detect for all contaminants of concern_ Water Before results are from soil boring B-2 collected at approximately 40 feet bsg <br /> on 10120104, except the water result for dodecane is from soil boring B-1 and is reported as an estimated value (J)since the <br /> result was taken from a Tentatively Identified Compound TIC search. NA—not analyzed <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: None <br /> Should corrective action be reviewed if land use changes? Yes <br /> Monitoring/Vapor wells decommissioned: NA Number Decommissioned: NA Number retained: NA <br /> List enforcement actions taken: NOR 02/20/04 <br /> List enforcement actions rescinded: None <br /> V. Local Agency Representative Data <br /> Name: Margaret Lagorio, REHS Title: Program Coordinator Unit IV <br /> Signature: Date: 3 1 4/0'7 <br /> VI. Central Valley Regional Water Quality Control Board (RB) Notification ! r <br /> Date Submitted to RB: Response Date: <br /> RB Staff: James L.L. Barton Response: <br /> Title: Associate Engineering 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 />