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Case Closure Summary Page 2 1%1 <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 Soll 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 1 0.61 ND<1.0 Oxygenates ---- ND<0.005 ND<0.5 ND<5.0 <br /> f <br /> mple Before denotes analytical results of samples taken during the 1990 tank removal avid the preliminary investigation <br /> 1997. Sample After denotes analytical results of the samples collected from the quarterly samplings and monitoring well <br /> stallation. Investigation and six quarters of samplings indicated minimal contamination in the groundwater. Investigation <br /> owed 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 Pian? 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:0 <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 List enforcement actions rescinded: None 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 Environmental Health <br /> Signature: p oadct�= Date: I;.2(—O <br /> Vi. Central Valley Regional Water Quality Control Board(RB)Notification <br /> Date Submitted to RB: August/03/2001 Response Date:September/11/2001 <br /> RB Staff:Marty Hartzell Response: <br /> Title:Assoc Eng Geologist <br /> VII. Additional Comments, Data,etc. <br /> All monitoring wells were properly destroyed by pressure grouting on October 23,2001 <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 />