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Case Closure Summary.Page 2 <br /> Leaking.Underground Fuel.Storage Tank Program <br /> 111 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) 1300 < 1.0 .460 <.05 Ethylbenene 20 <0.005 .0021 <.0005 <br /> TPH. (Diesel) NA NA NA NA Xylenes 140 <0.005 .0023 <.0005 <br /> Benzene 0.055 <0.005 <.0005 <.0005 MTBE 34 <0.005 1.7 <.0005 <br /> Toluene 29 <0.005 <.0005 <.0005 1,2-DCA NA NA <.0005 <br /> EDB NA NA <.0005 <br /> Comments:Active remediation was not performed at this site. All "Before".and "After".results reported in parts per million.. <br /> NA: Not analyzed <br /> Soil.Before'concentrations are from beneath.UST system at time of removal.on 08/15/96. <br /> Soil After concentrations are from.cone penetrometer test boring CPT-1 advanced on December 5, 2000 <br /> Water Before concentrations are from 10-07-98 quarterly sampling of monitoring well MW-1 <br /> Water After concentrations are from 10-10-05 quarterly sampling of.MW-1 <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: Yes. Number Decommissioned: 3 Number retained:. 0. <br /> List enforcement actions taken: NOR sent 06/16/97 <br /> List enforcement actions rescinded: None <br /> V. Local Agency Representative Data <br /> Name: Donna.Heran. Title: Director- San.Joaquin County Environmental Health <br /> Department <br /> Signature: _, Date: <br /> VI. Central Valley Regional Water Quality Control.Board (RB) Notification <br /> Date Submitted to RB: 12/23/05 Response Date: 01/24/06 <br /> RB Staff:James L.L..Barton. Response: No Further Action Required Concurrence. <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 />