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Case Closure Summary Page 2 <br /> Leaking Underground.Fuel Storage Tank gram <br /> III. 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 /> TRH(Gas) 2.6 <0.50 23 0.27 Xylenes 0.19 <0.0010 4.5 0.026 <br /> TPH (Diesel) NA NA NA NA MTBE NA <0.0010 2.6 0.032 <br /> Benzene <0.005 <0.0010 0.94 0.029 1,2-DCA NA <0.0010 0.085 <0.0005 <br /> Toluene 0.0098 <0.0010 1.2 <0.0005 EDB NA <0.0010 <0.05 NA <br /> Eth lbenzene 10.027 1<0.0010 11.4 0.019 <br /> Comments: Soil Before concentrations are taken from B-1/MW-1 at 36.5 feet bsg collected on 08128/95. Soil After data are <br /> taken from MW-1 R at 36 feet bsg collected on 4/27109. Water Before concentrations are taken from MW-1 collected on <br /> 9110/99 except 1,2-DCA and EDB are taken from 9112102. Water After concentrations are taken from MW-1 on 3/25109. <br /> 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: Some Number Decommissioned: 5 Number retained: 9 monitoring wells,4 vapor <br /> extraction wells, and 1 airsparge well <br /> List enforcement actions taken: NOR <br /> List enforcement actions rescinded: None <br /> I <br /> V. Local Agency Representative Data <br /> Name: Adrienne Ellsaesser, REHS Title: Acting Program Coordinator <br /> Signature: f�f Date.- <br /> VI. <br /> ate: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 />