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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 <br /> Before After Before After ( <br /> PPM) Water (ppm) <br /> TPH(Gas) 13000 <1 BeforeBefore After <br /> 22 <.05Ethylbenene 250 <,500 <.0005 <br /> TPH(Diesel) 140 NA <.150 <.05 X eneBenzene 160 .0074 8.4 <,00051400 .860 <.0005 <br /> Toluene 1100 <.005 <.500 <.0005 MTBE <br /> NA .011 NA <.0005 <br /> Comments: All levels in ppm. Soil Before levels from soil below UST#1 at 14.5 feet below surface grade at time of <br /> removal. Soil After levels are from soil boring 5 at 82 feet below surface grade on 5/25/99. Samples from all the other soil <br /> borings completed on 5/25/99 were non detect. Groundwater Before levels are from monitoring well MW2 on 4/11/94 <br /> except Diesel which is from 10/29/93. Groundwater After levels are from MW2 on 10/25/00. 1500 cubic yards of soil were <br /> excavated in October and November 1992, allowed to aerate on site in stock piles,then placed back in the excavation in <br /> January 1994. <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: 7 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 List enforcement actions rescinded: None 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 /> 3-0 <br /> VI. Central Valley Regional Water Quality Control Board (RB)Notification <br /> Date Submitted to RB: 4/17/01 Response Date: 4/19/01 <br /> RB Staff. Marty Hartzell Response: Concurrence <br /> Title:Associate En ineerin Geolo ist <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 official <br /> site file. <br />