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Case Closure Summary Page 2 <br /> �h Leaking Underground Fuel Storage Tank Program <br /> Ill. 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 /> TPH(Gas) 630 24 &0 0.064 Xylenes 13.0 0.2 0.20 <0.001 <br /> TPH(Diesel) NA NA NA NA Ethylbenzene 2.9 <0.1 0.064 <0.0005 <br /> Benzene 1.4 <0.1 0.013 <0.0005 Oil&Grease NA NA NA NA <br /> Toluene 1.3 <0.1 <0.0025 <0.0005 Heavy Metals NA NA NA <br /> INA <br /> MTBE <0.5 <0.05 0.016 0.0053 <br /> Comments: SOIL 'BEFORE' DATA FROM TANK REMOVAL OR INITIAL SOIL BORING SAMPLES FROM TANK PIT <br /> AREA; SOIL 'AFTER' DATA FROM BORINGS FOR MONITORING WELL MW-71OCATED IN TANK PIT AREA. <br /> WATER'BEFORE' DATA FROM SOIL BORING GRAB SAMPLE AND INITIAL GW MONITORING SAMPLES; WATER <br /> AFTER' DATA FROM THE MOST RECENTLY REPORTED GW MONITORING EVENT. <br /> IV. Closure <br /> Does completed corrective action protect existing beneficial uses per the Rdgional iBoard Basin Plan?YES <br /> �i <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 decommissioned: YES Number Decommissioned: 11 Number;retained: 0' <br /> List enforcement actions taken: NOR <br /> List enforcement actions rescinded: NONE <br /> V. Local Agency Representative Data <br /> Name: DONNA HERAN, REHS Title: DIRECTOR,.ENVIRONMENTAL HEALTH DEPT. <br /> Signature: Date: t <br /> .3 4-06 <br /> VI. Central Valley Regional Water Quality Control Board (RB) <br /> Notification <br /> i <br /> Date Submitted to RB: 03/16/06 Response Date: 05/08/06 <br /> RB Staff: JAMES L.L. BARTON Response:!CONCURRENCE <br /> Title: ENGINEERING GEOLOGIST <br /> f <br /> f <br /> VII, Additional Comments, Data, etc. <br /> II <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 />