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Leaking Underground Fuel StorageTank Program <br /> ;l <br /> 1 III Release and Site Characteon Information.(continued) <br /> Maximum Documented Contaminant Concentrations --Before and After Cleanup <br /> ,; , <br /> Contaminant Soil Soi!After Water Water Contaminant Soil Soil After. Water Water <br /> Before Before After Before Before After <br /> (mg/kg) (ug11) (mglkg) (µg11) <br /> TPH (Gas) 220 6 5,800 330 Ethylbenzene 0.0075 ND<0.005 95 ND<0.5 <br /> Motor Oil -- --- '1 ---- Xylenes 0.011 ND<0.005 570 ND<0.5 <br /> Benzene ND<0.005 ND<0.005 160 ND<0.5 Lead - 2.85 <br /> Toluene 0.025 ND<9.005 140 0.082 TPH (diesel) 12 ND<1 --- 1.0 <br /> 0 <br /> MTBE ND<0.01 ND<0.005 ---- 45 Oxygenates ---- ND<0.005 --- 1. <br /> P <br /> "Soil before" reflects sample results from time soil boring investigation in 1996, and "Soil After' reflects results from the tank <br /> pull in 1999. Investigation showed minimal impact to soil and groundwater. Beneficial uses of groundwater are protected, <br /> 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 z <br /> Site management requirements: none <br /> Should corrective action be reviewed if land use changes?Yes <br /> Monitoring wells decommissioned: No Number Decommissioned: 0 Number retained: 0 <br /> List enforcement actions taken: NOR and multiple compliance notification letters sent. Office meetings <br /> List enforcement actions rescinded: None <br /> V. Local Agency Representative Data <br /> it <br /> Name: Dot Lofstrom 'I Title: Engineering Geologist <br /> Signature: Date: Q <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 /> Ell <br /> Title: Assoc Eng Geologist <br /> VII. Additional Comments; Data, etc. .f <br /> Monitoring wells will be destroyed once concurrence for closure has been received from CVRWQCI3. Final closure will be <br /> issued only after-all monitoring wells are'destroyed. <br /> i� <br /> This document and the related CASE CLOSURE LETTER,Shall be retained by the lead agency as part of the <br /> official site file. (08124193) Exhibit N Page 2 of 2 <br />