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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) Water (ppm) Contaminant Soil (ppm) Water (ppm) <br /> Before After Before After Before After Before After <br /> TPH (Gas) <0.1 <1.0 16.0 <0.05 Xylene 0.0032 <0.0050 1.30 <0.0005 <br /> TPH(Diesel) NA NA NA NA Ethylbenzene <0.001 <0.0050 .710 <0.0005 <br /> Benzene <0.001 <0.005 0.440 <0.0005 Oil&Grease NA NA NA NA <br /> Toluene <0.001 <0.005 <.01 <0.0005 MTBE 0.175 <0.0050 3.40 <0.0005 <br /> TBA 1<0.20 0.0063 <2.5 <0.0005 <br /> Comments: The soil before concentrations are from a GeoProbe (GP-4) at 15 feet on 6/17/99 and the soil after <br /> concentrations are from GeoProbe (GP-7)at 15 feet on 10/16/07. Water before concentrations are from MW-1 on 1/15/01 <br /> and Water after concentrations are from GeoProbe GP-7. Two vapor wells/air sparge wells were installed and 2 vapor <br /> extraction pilot tests were performed at different periods in 2002. Ground water contaminants concentrations have declined <br /> to non-detect in all monitoring wells. <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 /> Monitoring/Vapor wells installed: 6 Number Decommissioned: 6 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 List enforcement actions rescinded: NA 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 /> Name: Donna Heran Title: Director of Environmental Health <br /> Signature: Date: <br /> VI. Central Valley Regional Water Quality Control Board (RB) Notification <br /> Date Submitted to RB: May 30, 2008 Response Date: June 19, 2008 <br /> RB Staff: J. Barton Response: NO FURTHER ACTION REQUIRED <br /> Title. Eng. Geologist CONCURRENCE <br /> VII. Additional Comments, Data, etc. <br /> All monitoring and vapor wells destroyed on 7/15/2008 <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 />