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% �rI <br /> 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 <0.20 0.0063 1 <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 10/16107. Water before concentrations are from MW-1 on 1115101 <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: 0 Number retained: 6 <br /> List enforcement actions taken: NOR sent to RP. <br /> List enforcement actions rescinded: NA <br /> V. Local Agency Representative Data <br /> Name: Margaret Lagorio Title: REHS, Program Coordinator <br /> Signature: Date: 5 �0 <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. <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 />