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Case Closure Summary Page 2 v <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 012 .015ppm ND <br /> < <br /> Toluene 9.167ppm ppm .003ppm ND <br /> Ethylbenzene 4.919ppm <.012ppm .028ppm ND <br /> Xylene 18.42ppm <.012ppm .01 ppm ND <br /> MTBE ND 0.49 ppm NT ND <br /> NA <br /> Soil Before results were from soil borings 7/25/96. Soil After results were from sidewall at 10 ft. during second <br /> overexcavation. Water Before samples were grab water from borings on 7/25/96. 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: NONE <br /> Should corrective action be reviewed if land use changes?YES <br /> Monitoring wells to be decommissioned: three Number Decommissioned: 3 Number retained: 0 <br /> List enforcement actions taken: NOR sent <br /> List enforcement actions rescinded: None <br /> V. Local Agency Representative Data <br /> Name: Do na Heran 42 <br /> Title: Director of Environmental Health <br /> Signature Date: 2 <br /> V. C tral Valley Regional Water Quality Control Board (RB) Notification <br /> Date Submitted to RB: 04/13/99 Response Date: 06/03/99 <br /> RB Staff: Mark List Response: Concurrence <br /> Title: Engineering Geologist <br /> VII. Additional Comments, Data, etc. <br /> Approximately 200 cu. yds. Of contaminated soil was excavated out of the UST and dispenser location. MWs have been j <br /> ND for contaminants. Pit soil samples collected on 8/21/98 evidence low concentrations of contaminants. Bottom sample of <br /> excavation was ND, except .005 ppm Benzene. Clayey soils. <br />