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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 soli (ppm) Water (ppm) Contaminant Soil (ppm) Water (ppm) <br /> Before After Before After Before After Before After <br /> TPH(Gas) 130 NA .420 .100 Ethylbenene .1 <.1 <.0005 <.0005 <br /> TPH (Diesel) 8800 4500 2 .510 Xylene .2 .2 <.0005 <.0005 <br /> Benzene c1 <.1 <.0005 <.0005 <br /> Toluene <br /> <,1 <.1 <.0005 <.0005 MTBE <1 <.2 .0011 <.0005 <br /> Comments: All levels in ppm. Soil Before levels from soil boring SB7 on 5128198 at 15 feet below surface grade. Soil After <br /> levels are from southeast sidewall of excavation at 17 feet below surface grade after removal of contaminated soil in June <br /> 1999. Groundwater Before is from MW1 on 612198. Groundwater After is from MW1 on 2125199. Estimate 3370 pounds of <br /> diesel removed by excavation of contaminated soil in June 1999. Site is now part of Highway 99 interchange at Jack Tone <br /> Road in Ripon. Further action is not feasible. <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 /> MonitoringlVapor 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 List enforcement actions rescinded: None 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: Margaret Lagorio Title: Supervising REHS <br /> Signature: Date: r _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: Associate Engineering 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 official <br /> site file. <br />