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U � <br /> Case Closure Summary Page 2 <br /> Leaking Underground Fuel Storage Tank Program <br /> Ili Release and Site Characterization Information (continued) <br /> Maximum Documented Contaminant Concentrations -- Before and After Cleanup <br /> Contaminant Soil (ppm) Water (ppm) Contaminant Soil (ppm) Water (ppm) <br /> Before After Before After Before After Before After <br /> TPH(Gas) 3,800 <1.0 6.7 <0.050 Xylenes 8.4 <0.005 0.350 <0.0006 <br /> TPH (Diesel) 280 1,300 39 <0.050 MTBE NA <0.005 <0.001 <0.001 <br /> Benzene 1.4 <0.005 0.023 <0.0005 1,2-DCA NA <0.005 0.021 <0.0005 <br /> Toluene 0.21 <0.005 0.0037 <0.0005 EDB NA <0.005 <0.001 <0.0005 <br /> Ethylbenzene 7.4 <0.005 0.290 <0.0005 <br /> Comments: Soil Before concentrations are taken from B-4 at 20 feet bsg collected on 04127/94. Soil After data are taken <br /> from CB-2 at 20 feet bsg collected on 10114/03. Water Before concentrations are taken from MW-1 collected on 11/07/00 <br /> except 1,2-DCA and EDB are taken from 10104101. Water After concentrations are taken from MW-1 on 02/12109. NA— <br /> not analyzed <br /> 1V. 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: 7MWs, 11VWs, 4 IAS wells <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 List enforcement actions rescinded: None 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: Date: <br /> •� /O/id/�/ <br /> VI. Central Valley Regional Water Quality Control Board (RB) Notification <br /> Date Submitted to RB: Response Date: <br /> RB Staff: James Barton, PG Response: <br /> Title: Engineering Geologist <br /> VII. Additional Comments, Data, etc. <br /> This document and the CASE CLOSURE LETTER shall be retained by the lead agency as part of the official site file. <br />