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Case Closure Summary Page 2 <br /> Lk Bing Underground Fuel Storage Tank Progv.,wi <br /> 111 Release and Site Characterization Information (continued) <br /> Maximum Documented Contaminant Concentrations -- Before and After Cleanup <br /> Contaminant Soil Soil Water Water Contaminant Soil Soil Water Water <br /> Before After Before After Before After Before After <br /> (ppm) (ppb) (ppb) <br /> TPH (Gas) i3300 64 210 ND Ethylbenzene 89 1.2 5.4 ND <br /> TPH (Diesel) NA NA NA NA Xylene 400 1.6 21 ND <br /> Benzene 13 0.16 4.3 ND Oil & Grease NA NA NA NA <br /> Toluene 190 0.97 16 5.0 Heavy Metal NA NA NA NA <br /> Mineral Spirits 41 NA NA NA EDB NA ND NA ND <br /> MTBE NA ND ND ND 1,2 DCA NA ND NA 1.0 <br /> The numbers above under"Before" reflect results of investigations from the time of the tank pull up to the soil borings <br /> investigation 1998, and the numbers under"After'reflect results of samples from the monitoring well installation. Limited <br /> contamination exists in the soil (vadose zone)at about 40 feet below surface grade. 2 quarters of sampling from monitoring. <br /> wells showed minimal impact to groundwater. Beneficial uses of groundwater are protected, now and in the future. <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 decommissioned: No Number Decommissioned: 0 (to be destroyed) Number retained: 3 <br /> List enforcement actions taken: NOR Letter sent <br /> List enforcement actions rescinded: None <br /> V. Local Agency Representative Data <br /> Name: Magaret Lagorio Title: Supervisor of LOP <br /> Signature: `' n c T Date: <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:Assoc Eng 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 site <br /> file. (08/24/93) Exhibit N Page 2 of 2 <br />