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Case Closure Summary Page 2 ` <br /> Lin ) <br /> g Underground Fuel,Storage Tank Prom <br /> III Release and Site Characterization Information (continued) <br /> Maximum Documented Contaminant Concentrations -- Before and After Cleanup <br /> Contaminant Soil Soil After Water Water Contaminant Soil Soil After Water Water <br /> Before Before After Before Before After <br /> (mg/kg) (pg/1) (mg/kg) (Ag/1) <br /> TPH(Gas) 220 6 . 5,800 330 Ethylbenzene 0.0075 ND<0.005 95 ND<0.5 <br /> Motor Oil ---- ---- ---- ---- 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<0.005 140 0.082 TPH (diesel) 12 ND<1 4,000 . 450 <br /> MTBE ND<0.01 ND<0.005 --- 45 Oxygenates ---- ND<0.005 ---- 1.0 <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 <br /> Site management requirements: none <br /> Should corrective action be reviewed if land use changes?Yes P <br /> Monitoring wells decommissioned: Yes Number Decommissioned:4 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 List enforcement actions rescinded: None 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 /> Name: Don&a Heran Title: Director of Environmental Health <br /> Signature: c!i1tiu� ,� Date: 2 -3-0 ) <br /> VI. Central Valley Regional Water Quality Control Board (RB) Notification <br /> Date Submitted to RB: Response Date: July 13, 2001 <br /> RB Staff: Marty Hartzell Response: Concurrence with no further action is required <br /> Title:Assoc Eng Geologist <br /> VII. Additional Comments,Data, etc. <br /> All remaining monitoring wells were destroyed by pressure grout. <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 /> i <br /> If - <br />