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i <br /> Case Closure Summary Page:Z <br /> Ling Underground Fuel Storage Tank Pron <br /> 111 Release and Site Characterization Information (continued) <br /> Mi.aximum Documented Contaminant Concentrations -- Before and After Cleanup <br /> Contaminant Soil Soil Water Water `Contaminarit= Soil Soil Water Water <br /> Before After Before After Before After (ppb) <br /> Before <br /> After <br /> (ppm) (Ppb) (ppb) y <br /> TPH (Gas) 330fl 64 210 ND Ethylbenzere 89 1.2 5 D <br /> .4 N <br /> T;PH (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 i <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 /> 1V. 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: Yes Number Decommissioned: 3 Number retained: 0 <br /> List enforcement actions taken: NOR Letter sent . <br /> List enforcement actions rescinded: None <br />` V. Local Agency Representative Data <br /> :Name: Donna Heran Title: Director of Environmental Health <br /> Signature: Date: J i26 Q <br /> Cent a Valley Regional Water Quality Control Board (RB) Notification <br /> Date Submitted to RB:August 17, 2001 Response,Date: September 21, 2001 <br /> 1RB Staff: Marty Hartzell Response' Concurrence with no further action is required <br /> Title: Assoc Eng Geologist <br /> VII. Additional Comments, Data, etc. <br /> -t <br /> IJ <br /> This document and the related CASE CLOSURE LETTER, Shall be retained by the lead agency as part of the official site <br /> file. (08124193) Exhibit N Page 2 of 2 <br />