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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 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 <0.001 <br /> Benzene <0.023 <0.02 X0.0005 Oil&Grease NA NA NA <br /> Toluene <0.023 <0.02, <0.001 Heavy Metals NA NA NA <br /> - I I MTBE 11.3 1 14.2 10.049 <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 MWA FROM 8/05-8108, ON WELL MW-6 <br /> FROM 8105- 1109,AND ON WELL MW-2 FROM 9108- 1/09. 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- YES Number Decommissioned: 9 Nurnberretained: 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 List.enforcement actions rescinded: NONE 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: <br /> VI. Central Valley Regional Water Quality Control Board (RB) Notification <br /> Date Submitted to RB: 08/24/10 Response Date: 09/21/10 <br /> RB Staff: JAMES L.L. BARTON, PG Response: CONCURRENCE <br /> Title: ENGINEERING GEOLOGIST <br /> VII. Additional Comments, Data, etc. <br /> 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 /> r - e . <br />