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Case Closure Summary Page 2 <br /> Leaking Underground Fuel Storage Tank Program <br /> III Release and Site Characterization Information (continued) <br /> FMaximum Documented Contaminant Concentrations -- Before and After Cleanup <br /> Contaminant Soil Before (ppb) (ppb)After Water Before (ppb)After <br /> TPH gas 37,000 ND NA ND <br /> TPH diesel ND NA NA NA <br /> Toluene 160 ND NA ND <br /> Benzene 120 ND NA ND <br /> Xylene 680 7.3 NA ND <br /> MTBE NA ND NA ND <br /> Ethyl Benzene 280 ND NA ND <br /> No remediation required. Soil before results were from tank removal sampling on 06/06189. Soil after samples were from <br /> monitoring well borings 12/98. Water after samples are from monitoring wells 1998. <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 wells decommissioned: YES Number Decommissioned: 3 Number retained: 0 <br /> List enforcement actions taken: NOR sent <br /> List enforcement actions rescinded: None <br /> V. Local Agency Representative Data <br /> n <br /> Name: D na Heran.' / Title: Director of Environmental Health <br /> Signatur Date: 1-5-2 �2_- <br /> Vl. tral Valley Regional Water Quality Control Board (RB) Notification <br /> Date Submitted to RB: 9/20/99 Response Date: 1119/99 <br /> RB Staff: Mike Smith Response: CONCURRENCE <br /> Title: <br /> VII, Additional Comments, Data, etc. <br /> Minimal soil and water contamination. Migration Potential Report reflects that groundwater velocity is 0.3 ft./yr. <br /> Investigative report reflects impact to domestic well is unlikely. <br /> This document and the related CASE CLOSURE LETTER, Shall be retained by the lead agency as part of the <br /> official site file. (08124/93) Exhibit N Page 2 of 2 <br />