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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 Soil Water Water Contaminant Soil Soil Water Water <br /> Before Before After Before After Before After <br /> (ppm) After (ppb) (ppm) (ppb) <br /> TPH(Diesel) 1,100 3,700 160 290 Ethylbenzene NA NA <.0003 NA <br /> Benzene ND<0.5 NA <.0003 NA Xylene <.5 NA <.0003 NA <br /> Toluene ND<0.5 NA <.0003 NA <br /> Soil Before results from 1987 borings. Soil After results from 1988 excavation. Water Before results are from HP 19 drilled <br /> in November 1991. Water After results are from MW5 on 7/24/02. <br /> MW-1, 2, and 3 were destroyed in 1991. Sampling of MW-4, 5, and 6 ceased in 1995 but resumed for two quarters in 2002. <br /> Results of all three wells sampled in 2002 were non-detect except MW-5 sample from July. Well survey using DWR data <br /> identified the closest receptor well to be approximately 1/81h mile from site. <br /> Investigation showed minimal impact to soil and groundwater. Beneficial uses of groundwater are protected, now and in the <br /> future. <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: Some Number Decommissioned: 6 Number retained: 6 <br /> List enforcement actions taken: NOR sent <br /> List enforcement actions rescinded: None <br /> V. Local Agency Representative Data <br /> Name: Donn Heran Title: Director of Environmental Health <br /> < Signature: Date: 3--3—03 <br /> VI. Central Valley Regional Water Quality Control Board (RB) Notification <br /> Date Submitted to RB: Response Date: January 9, 2003 <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. (08/24/93) Exhibit N Page 2 of 2 <br />