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*age 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 Soil Water Water <br /> BeforeAfter Before After <br /> TPHdiesel 7192ppm 12ppm 2.78ppm ND <br /> TPHgas 1972ppm <100ppm .639ppm ND <br /> Benzene 4.454ppm 015ppm ND <br /> Toluene 9.1fi7ppm <.012ppm ,003 <br /> ppm ND <br /> <012 <br /> ppm 4.919ppm ppm .028ppm ND <br /> Xylene 18.42ppm <.012ppm NT <br /> Dppm ND <br /> ND <br /> MTBE 0.49 ppm <br /> NA <br /> Soil Before results were from soil borings 7125196. Soil After results were from sidewall at 10 ft. during second <br /> overexcavation. Water Before samples were grab water from borings on 7125196. Water After was from MWs. <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: MWs need to be destroyed. <br /> Should corrective action be reviewed if land use changes?YES <br /> Monitoring wells to be decommissioned: three Number Decommissioned: none Number retained: 3 <br /> List enforcement actions taken. NOR sent <br /> List enforcement actions rescinded: None <br /> V. Local Agency Representative Data <br /> Name: Margaret Lagorio Title: Supervising REHS <br /> Signature: Date: L�Ic( 01 <br /> VI. Central Valley Regional Water Quality Control Board (RB) Notification <br /> Date Submitted to RB: Response Date: <br /> RB Staff: Mark List Response: <br /> Title: Engineering Geologist <br /> VIE. Additional Comments, Data, etc. <br /> Approximately 200 cu. yds. Of contaminated soil was excavated out of the UST and dispenser location. MWs have been <br /> ND for contaminants. Pit soil samples collected on 8121198 evidence low concentrations of contaminants. Bottom sample of <br /> excavation was ND, except.005 ppm Benzene. Clayey soils. <br />