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• � v v <br /> Case Closure Summary Page 2 <br /> 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) <4.5 <2.0 0.054 Xylenes <0.023 <0.04 <0.001 <br /> TPH (Diesel) NA NA NA Ethylbenzene <0.023 <0.02 <6.001 <br /> Benzene <0.023 <0.02 <0.0005 Oil &Grease NA NA NA <br /> Toluene <0.023 <0.02 <0.001 Heavy Metals NA NA NA <br /> MTBE 1.3 4.2 0.049 <br /> Comments: WATER 'BEFORE'AND 'AFTER' DATA FROM MW-6 ON 04/29/05 AND 0709110, RESPECTIVELY. INTERIM <br /> REMEDIATION BY BATCH EXTRACTION WAS CONDUCTED ON WELL MW-1 FROM 8105 - 8108, ON WELL MW-6 <br /> FROM 8/05 - 1109, AND ON WELL MW-2 FROM 9108 - 1109. SOIL'BEFORE' SAMPLES ARE FROM 2005, MW-6 BORING; <br /> NO SAMPLES WERE ANALYZED IN 2003 WHEN MW-1 THRU MW-4 WERE INSTALLED; NO SOIL SAMPLES WERE <br /> COLLECTED ONSITE AFTER 2005. NO SOIL REMEDIATION HAS BEEN CONDUCTED AT THE SITE. <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: NONE <br /> Should corrective action be reviewed if land use changes?YES <br /> Monitoring/Vapor wells decommissioned: NO Number Decommissioned: 0 Number retained: 9 <br /> List enforcement actions taken: NOR <br /> List enforcement actions rescinded: NONE <br /> V. Local Agency Representative Data <br /> Name: ADRIENNE ELLSAESSER, RENS Title: ACTING PROGRAM COORDINATOR <br /> Signature: I Date: 261-21110 <br /> VI. Central Valley Regional Water Quality Control Board (RB) Notification <br /> Date Submitted to RB: s I Z y 1 ) 0 Response Date: <br /> RB Staff: .LAMES L.L. BARTON, PG Response: <br /> Title: ENGINEERING GEOLOGIST <br /> VII. Additional Comments, Data, etc. <br /> 11 Site passes ESL screening levels for potential threat to vapor intrusion from both soil and groundwater. <br /> This document and the related CASE CLOSURE LETTER shall be retained by the lead agency as part of the official site file. <br />