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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 /> Maximum Documented Contaminant Concentrations- - Before and After Cleanup <br /> Contaminant Soil Before (ppm) Water (ppm) Contaminant Soil Before (ppm) Water (ppm) <br /> After Before After After Before After <br /> TPH-g 3.9 <1 Xylene .304 <.005 <br /> Benzene .0425 < .005 Lead 15.7 <br /> Toluene .192 < .005 EDB <.005 <br /> Ethylbenzene .0578 < .005 MTBE NA <.05 <br /> Comments: <br /> Soil before results from the sample taken beneath the UST when it was removed 5/7/86. Soil after results are from samples <br /> taken during boring investigation on 2/22/02. Groundwater depth taken from groundwater monitoring wells onsite that monitor <br /> discharge from the wastewater treatment ponds. Conflicting documentation as to whether tank was 300 gallons or 450 gallons. <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: No Number Decommissioned: 0 Number retained: N/A <br /> List enforcement actions taken: NOR <br /> List enforcement actions rescinded: <br /> V. Local Agency Representative Data <br /> Name: Donna Heran Title: Director of Environmental Health <br /> Signature: Date: -O Z, <br /> VI. Central Valley Regional Water Quality Control Board (RB) Notification <br /> Date Submitted to RB: 5/23/02 Response Date: 6/3/02 <br /> RB Staff: Marty Hartzell Response: Concurrence <br /> Title: 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 />