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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) 11,000 400 45 <0.05 Xylenes 840 27 5.7 0.0066 <br /> TPH (Diesel) 1,000 NA 1.1 NA Ethylbenzene 180 2.1 1.2 0.003 <br /> Benzene 42 0.05 5.0 0.0099 Oil&Grease NA NA NA NA <br /> Toluene 420 1.7 5.4 <0.0005 Heavy Metals NA NA NA NA <br /> MTBE <1.0 <0.005 <0.13 <0.001 <br /> Comments: Soil Before results are from geoprobe boring P3 at 40 feet. Soil After results are from confirmation boring B-101 <br /> at 20 feet. Water Before results are from MW-2 on 12/04/98. Water After results are from MW-2 on 09/01/06; 1,2-DCA and <br /> EDB results were <0.0005. Confirmation soil samples were non-detect for 1,2-DCA and EDB. No SFBRWQCB <br /> Environmental Screening Levels were exceeded. Compliance with the Public Participation requirements in Section 2728 of <br /> the California Code of Regulations has been met. Soil vapor extraction and air sparging was conducted at the site from April <br /> k�2000 until June 2005. <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: 23 Number retained: 0 <br /> List enforcement actions taken: NOR <br /> List enforcement actions rescinded: NONE <br /> V. Local Agency Representative Data <br /> Name: DONNA RERAN, 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: 09/21/06 Response Date: 10/04/06 <br /> RB Staff: JAMES L.L. BARTON Response: CONCURRENCE <br /> Title: ENGINEERING GEOLOGIST <br /> VII. Additional Comments, Data, etc. <br /> WELLS DESTROYED AUGUST 20-23, 2007. <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 />