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Page 2 <br /> rCase Closure Summary <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 Before (ppm) Water (ppm) Contaminant Soil Before (ppm) Water (ppm) <br /> After Before After After Before After <br /> TPN (Gas) 19,200 170 19.0 Xylenes 103 12.0 2.1 <br /> TPH(Diesel) 1500 <0.05 NA Ethylbenzene 251 3.2 0-750 <br /> Benzene 251 42.0 2.4 Motor Oil <5000 NA NA <br /> Toluene 1160 51.0 1.2 Heavy Metals <0.5 Pb NA NA <br /> MTBE NA <0.50 <br /> Comments: The before and after ground water concentrations are from MW-1. The before soil concentrations are from <br /> goring AA3-45(45 feet bgs)which was converted to an air sparge remediation well in the source area prior to conducting <br /> SVEIIAS; except Diesel, Pb and motor oil results from tank pull samples. No confirmation soil samples were collected. <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?Yes <br /> MonitotnglRemediation Wells Decommissioned?Yes Number Decommissioned: 2 Number retained: 36 <br /> List enforcement actions taken: NOR sent to RPs <br /> List enforcement actions rescinded: None <br /> V. Local Agency_Representative Data <br /> Name: Adrienne Ellsaesser, REHS Title: Acting Program Coordinator <br /> Signature: �4o�,�,� Date: <br /> VI. Central Valley Regional Water Quali 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. <br /> Soil excavated to 35 feet bgs after UST removals in 1990. SVEIIAS performed as final remediation. <br /> This document and the related CASE CLOSURE LETTER shall be retained by the lead agency as part of the official site file. <br />