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Case Closure Summary Page 2 <br /> Leaking Underground Fuel Storage Tank Program <br /> III Release and Site Characterization Information continued <br /> Maximum Documented Contaminant Concentrations--Before and After Cleanup <br /> Contaminant Soil (ppm) T65 <br /> Contaminant Soil (ppm) Water (ppm) <br /> Before After Before After Before After <br /> TPH (Gas) 5900 0.67 Xylene 1000 0.068 0.330 ,0.0005 <br /> TPH(Diesel) 15000 <10.0 Ethylbenzene 190 <0.005 0.036 <0.0005 <br /> Benzene 70 0.042 Oil&Grease NA NA NA <br /> Toluene 630 0.017 5 Heavy Metals NA NA NA NA <br /> MTBE NiA NA NA ,0.0005 <br /> Comments: Soil Before result are from samples (T3A, P4)that were collected at the time of the UST and piping removal. <br /> Soil After results arefrom MW#2 at 19 feet below grade. Water Before results are from MW2 on 5/11/95. Water After <br /> results are from MW2 on 10/29/04. 700 cubic yards of soil was removed from the area of P4 (dispenser area)and was <br /> remediated on-site. No other remediation occurred at this site. Groundwater monitoring was conducted from 1993-2005. <br /> GROUNDWATER RESULTS ARE FROM MW#2 WHICH HAD THE HIGHEST CONTAMINANT CONCENTATIONS <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: NA <br /> Should corrective action be reviewed if land use changes? NA <br /> Monitoring/Vapor wells: 8 Number Decommissioned: 8 Number retained: 0 <br /> List enforcement actions taken: NOR SENT TO RP <br /> List enforcement actions rescinded: NA <br /> V. Local Agency Representative Data <br /> ame: Donna HeS Title: Director, Environ ental Health Department <br /> Signature: Date: <br /> VI. ntfal Valley Regional Water Quality Control Board (RB) Notification <br /> Date Submitted to RB: 3/13/06 Response Date: 5/8/06 <br /> RB Staff: Brian Newman Response: No Further Action Required Concurrence <br /> Title: Underground Tank Program Manager <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 <br /> site file. <br />