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Case Closure Summary Page 2 11%-4 <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 /> ContaminantSoil Soil Water Water Contaminant Soil Soil Water Water <br /> Before After Before After Before After Before After <br /> (ppm) (ppb) (Ppm) (ppb) <br /> TPH(Gas) 8100 11,000 ---- ---- Ethylbenzene 66 8.9 ____ <br /> Motor Oil ---- ---- Xylene 760 1,500 --- <br /> Benzene ND<25 ND<3.0 ---- ---- Lead ---- -'-- '""" """" <br /> Toluene 49 ND<3.0 ---- ---- EDB ---- ---- <br /> MTBE ND<0.01 ND<5.0 ---- ---- Oxygenates ND<0.01 ND<3.0 ---- ---- <br /> Samples from the tank removal in 1991 indicated contamination in the soil around the piping. Subsequent investigations <br /> demonstrated the size and mass of the soil contamination to be limited to a small area. Investigation showed minimal <br /> impact to soil and groundwater. Beneficial uses of groundwater are protected, now and in the 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: N/A Number Decommissioned: 0 Number retained: 0 <br /> List enforcement actions taken: NOR Letter sent <br /> List enforcement actions rescinded: None <br /> V. Local Agency Representative Data <br /> Name: Donna Heran Title: Director of Environmental Health <br /> Signature: Date: <br /> V . ntral Valley Regional Water Quality Control Board (RB) Notification <br /> 16Zate Submitted to RB: June 12, 2001 Response Date: July 11, 2001 <br /> RB Staff: Marty Hartzell Response: RWQCB concurs that no further action is <br /> Title:Assoc Eng Geologist required <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 />