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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 /> .I <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 /> 1 <br /> Comments: Soil Before concentrations are taken from B-4 at 20 feet bsg collected on 04127194. Soil After data are taken <br /> from CB-2 at 20 feet bsg collected on 10/14103. 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 02112109. NA-- <br /> not analyzed <br /> IV. Closure <br /> Does completed corrective action protect existing beneficial uses.per the Regional'°Board Bas+n 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 /> MonitoringNapor wells decommissioned: Yes Number Decommissioned: 6MWs, 11VWs, 4 IAS wells Number retained: 1 <br /> MW-5 retained;b the Water Bd. for nitrate monitoring <br /> List enforcement actions taken: NOR <br /> I - . . <br /> List enforcement actions rescinded: None <br /> V. Local Agency Representative Data. <br /> Name: Donna Heran, RENS Title: Director <br /> Signature. Date: April.;19, 2012 <br /> VI. Central Valley Regional Water Quality Control Board (RB) Notification <br /> Date Submitted to RB: October 18, 2011 Response"Date.: November 1, 2011 <br /> RB Staff. James Barton, PG Response: Concurrence <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 />