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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 (ppm) Water (Ppm) Contaminant soil (Ppm) Water (ppm) <br /> Before After Before After Before After Before After <br /> ITPH(Gas) 2,200 11000 12 14 Ethylbenens 14 28 .830 .920 <br /> TPH(Diesel) Xylene 300 110 2.8 1.3 <br /> Benzene 11 4.6 .028 <.005 <br /> Toluene 390 54 .033 <.011 MTBE <.500 <.050 <br /> Comments: All levels in ppm. Sod Before levels from excavation sidewail soil sample on 4/16/93. Soil After levels from <br /> excavation bottom soil sample on 5/25/93. Groundwater Before levels from MW1 on 4/12196. Groundwater After levels <br /> from MW1 on 6/16/97. 1023 tons of contaminated soil removed in April-May 1993. <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/Vapor wells decommissioned: Yes Number Decommissioned: 3 Number retained: 0 <br /> List enforcement actions taken: NOR <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 List enforcement actions rescinded: None 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 /> Vl. Central Valley Regional Water Quality Control Board(RB) Notification <br /> Date Submitted to RB: 02/18/98 Response Date. 07/10/98 <br /> RB Staff. Mark List Response: Concurrence <br /> Title: Engineering ist <br /> VII. Additional Comments, Data,etc. <br /> E .j <br /> This document and the related CASE CLOSURE LETTER,Shall be retained by the lead agency as part of the official <br /> SRO file. <br />