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I %WI Case Closure Summary Page 2 14,40d <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 After Before After Before After Before After <br /> (Ppm) (Ppb) (Ppm) (Ppb) <br /> TPH(Gas) 220 ND<1.0 10,000 ND<50 Ethylbenzene 1.1 ND<0.005 280 ND<0.5 <br /> Motor Oil ND ---- ---- --- Xylene 2.1 ND<0.005 610 ND<0.5 <br /> Benzene 0.067 ND<0.005 ND<9 ND<0.3 Lead ND ---- ---- --- <br /> Toluene 0.017 ND<0.005 ND<9 ND<0.3 Diesel 89 ND<1.0 660 4,100 <br /> MTBE ---- ND<0.005 0.61 ND<1.0 Oxygenates ---- ND<0.005 ND<0.5 ND<5.0 <br /> Sample Before denotes analytical results of samples taken during the 1990 tank removal and the preliminary investigation <br /> in 1997. Sample After denotes analytical results of the samples collected from the quarterly samplings and monitoring well <br /> installation. Investigation and six quarters of samplings indicated minimal contamination in the groundwater. Investigation <br /> showed minimal 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: No Number Decommissioned: 0 Number retained:4 <br /> List enforcement actions taken: NOR sent <br /> List enforcement actions rescinded: None <br /> V. Local Agency Representative Data <br /> Name: Margaret Lagorio Title: Supervisor of LOP <br /> Signature: Date: g �s D <br /> VI. Central Valley Regional Water Quality Control Board (RB)Notification <br /> Date Submitted to RB Response Date: <br /> RB Staff: Marty Hartzell Response: <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 />