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r <br /> ] Case Closure Summary Page 2 <br /> 3` Luing Underground Fuel Storage Tank Progr <br /> III Release and Site Characterization Information (continued) <br /> Maximum Documented Contaminant Concentrations E: <br /> Contaminant Soil Before(ppm) Soil After(ppm) Water Before (ppm) Water After(ppm) <br /> TPH-E(Diesel) 8.2 ---- ---- "" <br /> TPH-E(Oil) 280 <10 ---- <.50 <br /> TPH-Purgeable 12,000 <7.0 <.10 <.05 <br /> <2 <.005 <.0005 x.0005 <br /> Benzene l <br /> Toluene <2 <.005 .0006 <.0005 <br /> Ethylbenzene 7.1 <.005 <.0005 <.0005 <br /> 006 <.005 <.0005 <.0005 <br /> Xylene <br /> MTBE <2 <.005 <.0005 <.0005 <br /> Soil and Water Before Results are from samples collected beneath the UST at the time of removal. Soil and Water After <br /> Results are from Geoprobe sampling 8130100. Tanks were removed in April 2000 and soil sampled at 16 feet below surface <br /> grade. Stockpiled soil was used to fill the excavation when subsequent investigation and laboratory analyses of samples <br /> indicated minimal impact to soil and groundwater. Beneficial uses of groundwater are protected, now and in the future. <br /> IV. Closure <br /> f <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 wells decommissioned: NIA Number Decommissioned: NIA Number retained: NIA <br /> List enforcement actions taken: NOR sent <br /> fist enforcement actions rescinded: None <br /> I <br /> V. Local Agency Representative Data 1 <br /> Name: DoTa Heran Title: Director of Environmental Health <br /> Signature: Date:Date: ,Zy,U o� <br /> VI. Central Valley Regional Water Quality Control Board (RB) Notification <br /> Date Submitted to RB: 11/20/2000 Response Date: 11/27/2000 <br /> RB Staff: Marty Hartzell Response: Concurrence that no further action is required <br /> Title: Assoc 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 <br /> official site file. (08124193) Exhibit N Page 2 of 2 <br />