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Case Closure Summary : Exhibit N Pio1 of 2 <br /> 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/ppm (ppm) Water (ppb) Contaminant Soil (ppb) Water (ppb) <br /> Before After (ppb) After Before After Before After <br /> Before <br /> TPH(Gas) 4,300 1.5 690 ND <br /> Toluene 78 .013 22 ND <br /> Benzene 7.5 .012 19 5.5 <br /> Ethylbenzene 82 .016 17 1.1 <br /> Xylene 400 .048 75 .97 <br /> TPHdiesel 870 --- NA ND <br /> MTBE --- ND ND 4.3 <br /> Soil before results are from beneath removed tank. Soil after results are from MW BT1 boring 11/10/97. MW2 and 3 soil <br /> borings were ND at 20 ft bsg. Water before results are from MW3 in 11/97. Water after results are from MWs on 3/10/99, <br /> except TPHd obtained in 8/99. Remediation not performed. <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: Yes Number Decommissioned: 4 Number retained: 0 <br /> FListnforcement actions taken: NOR sent <br /> nforcement actions rescinded: None <br /> V. Local Agency Representative Data <br /> Name: Donna He n Title: Director of Environmental Health <br /> Signature: Date: /� 2 y 9 <br /> Vjentral Valley Regional Water Quality Control Board (RB) Notification <br /> - ') <br /> Date Submitted to RB: 10/15/99 Response Date: 11/16/99 <br /> RB Staff: Michael Smith Response: Concurrence <br /> Title: Environmental Specialist II <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 />