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Case Closure Summary : Exhibit N ",qe 1 of 2 <br /> Case Closure Summary Page 2 <br /> Leaking Underground Fuel Storage Tank Program <br /> III Release and Site Characterization Information (continued) <br /> Maximum Documented Contaminant Concentrations --Before and After Cleanup <br /> Contaminant Soil (ppb) Water (ppb) Contaminant Soil (ppb) Water (ppb) <br /> Before After Before After Before After Before After <br /> TPH (Gas) 3.1 ppm ND NA <0.50 <br /> Toluene oo6ppm ND NA <0.50 <br /> Benzene ND ND NA <0.50 <br /> Xylene 024ppm ND NA <0.50 <br /> MTBE NA ND <0.50 <br /> Ethyl Benzene ND ND <0.50 <br /> No remediation required. Soil before results were from soil borings drilled 1/19/92. Soil and groundwater after results were <br /> from a follow up boring at 20 ft bsg. <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: NA Number Decommissioned: NA Number retained: 0 <br /> List enforcement actions taken: NOR sent <br /> List enforcement actions rescinded: None <br /> V. Local Agency Representative Data <br /> Name: Donna Hk�heran Title: Director of Environmental Health <br /> Signature: Date: /�—�f <br /> VI. Central Valley Regional Water Quality Control Board (RB) Notification <br /> Date Submitted to RB: May 28, 1999 Response Date: <br /> RB Staff: Mark List Response: No response <br /> Title: Engineering Geologist <br /> VII. Additional Comments, Data, etc. <br /> Soil Only. <br /> This document and the related CASE CLOSURE LETTER, Shall be retained by the lead agency as part of the <br /> official site file. (08/24/93) Exhibit N Page 2 of 2 <br />