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Case Closure summary Yeaking <br /> Page 2 <br /> Underground Fuel Storage Tank dram <br /> Ill. 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) 150 7.0 3.4 Xylenes 5.5 0.52 0.033 <br /> TPH(Diesel) NA NA NA MTBE x0.010 x0.0005 x0.0010 <br /> Benzene <0.10 0.011 0.0029 1,2-DCA NA 0.0049 0.00059 <br /> Toluene 0.18 x0.010 x0.001 EDB NA x0.0005 NA <br /> Eth benzene _111.8 1 10.77 10.24 <br /> Comments: Soil Before concentrations are taken from GP-1 at 15.5 feet bsg collected on 08116101. Soil After data are not <br /> available since remediation was-not performed and confirmation soil samples were not collected. Water Before <br /> concentrations are taken from MW-3 collected on 03/16/06 except MTBE and 1,2-DCA concentrations are taken from MW-3 <br /> collected on 12122105, and EDB concentrations are taken from MW-3 collected on 12/28104. Water After concentrations are <br /> taken from MW-3 collected on 12122110. NA—not analyzed <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: No ., Number Decommissioned: 0 Number retained: 5 <br /> List enforcement actions taken: NOR <br /> List enforcement actions rescinded:None <br /> f <br /> V. Local Agency Representative Data <br /> Name: Adrienne Ellsaesser,'REHS Title: Acting Program Coordinator <br /> Signat e.C��l�/z2 G7 � Date: <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 />