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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 /> Contaminant Soil (ppm) Water (ppm) Contaminant Soil (ppm) Water (ppm) <br /> Before After Before After Before After Before After <br /> TPN(Gas) 3300 220 34 .190 Ethylbenene NA 1 2.3 <.0005 <br /> TPH (Diesel) <1 <5 <.05 <.05 Xylene 380 5.6 6.1 <.0006 <br /> Benzene 54 .084 12 <.0005 MTBE NA <.005 .120 <.001 <br /> Toluene 280 .044 4.9 <.0005 <br /> Comments: Soil Before results are from soil sample collected beneath Tank 1 when it was removed. Soil After results are <br /> from the soil sample collected from confirmation boring C133 at 25 feet at the soil/water interface. Water Before results are <br /> from VW2d on 11/26/97. Water After results are from VW2d on 6/5/06. Vapor extraction and air sparging was conducted <br /> from October 2001 until May 2003. The TPH remaining in the soil doesn't exceed the San Francisco Bay Regional Water <br /> Quality Control Board Environmental Screening Level for gross contamination or direct exposure. The vapor extraction <br /> system exhaust was non detect for contaminants when it was shut down in May 2003. The extent of remaining soil and <br /> groundwater contamination is limited. This is a fire fighting training facility as well as a fire station. Compliance with the <br /> Public Participation requirements in Section 2728 of the California Code of Regulations has been met. <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: Number Decommissioned: 22 Number retained: 0 <br /> List enforcement actions taken: NOR <br /> List enforcement actions rescinded: <br /> V. Local Agency Representative Data <br /> dame: Donna Hera n ' Title: Director of Environmental Health <br /> Sign ure: i Date. /� Q <br /> r <br /> Vl. Ce ral.Valley Regional-Water Quality Control Board (RB) Notification <br /> Dat Submitted to RB: 3112/07 Response Date: 4123/07 <br /> RB Staff: James L.L. Barton Response: Concurrence <br /> Title: Associate Engineering Geologist <br /> Vli. Additional Comments, Data, etc. <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 />