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�.1 <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) 9,300 140 0.97 Xylenes 1,100 12 0.0086 <br /> TPN (Diesel) 3,100 150 ND Ethylbenzene 180.0 2.8 0.0009 <br /> Benzene 44.0 9.6 0.010 Oil &Grease NA NA NA <br /> Toluene 430.0 30 0.001 Heavy MTBE Metals NA NA NA <br /> 0.16 x.0005 <br /> Comments: Soil 'before' results from tank removal samples. There are no Soil 'after' results because no confirmation soil <br /> borings were installed. Soil vapor samples were collected in June 2009; all analytical results were reported non-detect. <br /> Water'before' results are the highest detected in MW2 in 2000, except TPH-diesel is from MW5 on 4130199, all results <br /> before remediation started. Water'after' results are from 6130109 groundwater analytical results from MW-5. <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 uses changes?YES <br /> Monitoring/Remediation wells: 25 Number Decommissioned: 25 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 List enforcement actions rescinded: NONE 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 <br /> Signature: Date: <br /> VI. Central Valley Regional Water Quality Control Board (RB) Notification <br /> Date Submitted to RB: NOVEMBER 19, 2009 Response Date: DECEMBER 21, 2009 <br /> RB Staff: JAMES L.L. BARTON, PG Response: CONCURRENCE <br /> Title: ENGINEERING GEOLOGIST <br /> VII. Additional Comments, Data, etc. <br /> Compliance with the Public Participation requirements in Section 2728 of the California Code of Regulations has been met. <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 />