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r <br /> Case Closure Summary Page 2 <br /> Leaking Underground Fuel Storage Tank Program <br /> i <br /> 111 Release and Site Characterization Information (continued) <br /> Maximum Documented Contaminant Concentrations--Before and After Cleanup <br /> Water (ppm} Contaminant Soil (ppm) Water. (PPM) <br /> Contaminant Soil (ppm) Before After Before After Before After <br /> Before After 120 Xylene 730 4.6 FFPH <br /> .00111 <br /> TPH(Gas} 8900 29 FPPH <0.5 FFPH .0013 <br /> TPH(Diesel) NA NA NA NA Ethytbenzene <br /> Benzene 8.9 <0.5 FP <br /> PH 0.0025 Oil &Grease NNAA <br /> NA NA NA <br /> Toluene 270 <0.5 FPPH <0.0005 Heavy Metals NA NA NA N� <br /> MTBE unk <0.5 0.0412 <O.00Q5. <br /> Comments: The Soil Before concentrations are from soil sample TP3 NE collected beneath one of the USTs (16.5 feet <br /> below grade)at the time of removal. The Soil After concentrations are from confirmation boring SB-13 at 30 ft. after <br /> remediation. The Water Before concentrations are from MW#1 on 2117100. Free phase petroleum hydrocarbon (FFPH) <br /> appeared in MW#1 after SVE/AS began. The Water After concentrations are from MW#1 on 8114105. No 1,2-DCA, EDS or <br /> other fuel oxygenates were detected in water after remediation. The SEVIAS remediation removed approximately 39,000 <br /> pounds of gasoline from 1999 to 2004. <br /> NA=not analyzed <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/Vapor wells :22 Number Decommissioned: 0 Number retained: 22 <br /> List enforcement actions taken: NOR sent to R.P./Level 1 <br /> List enforcement actions rescinded: NA <br /> V. Local Agency Representative Data <br /> Name: Margaret Lagorio Title: Supervising REHSISite Mitigation/LOP Unit IV <br /> Signature: 4 Date: 12 7 Q <br /> VI. Central Valley Regional Water Quality Control.Board (RB) Notification <br /> Date Submitted to RB: Response Date: <br /> RB Staff: J. Barton Response: <br /> Title: Eng, Geologist <br /> VII. Additional Comments, Data, etc. IN, ,. <br /> This document and the related CASE CLOSURE LETTER,Shall be retained by the lead agency as part of the official <br /> site file. <br />