SITE INFORMATION AND CORRESPONDENCE

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NNW Case Closure Summary Page 2 Leaking Underground Fuel Storage Tank Program III Release and Site Characterization Information (continued) Maximum Documented Contaminant Concentrations --Before and After Cleanup Contaminant Soil (ppm) Water (ppm) Contaminant Soil (ppm) Water (ppm) Before After Before After Before After Before After TPH(Gas) <1 <1 <.05 <.05 Ethylbenene <.003 <.005 <.0005 <.0005 TPH(Diesel) NA NA NA NA Xylene .025 <.005 <.0005 <.0005 Benzene <.003 <.005 <.0005 <.0005 MTBE 11 .011 1.3 <.0005 Toluene <.003 <.005 <.0005 <.0005 Comments: Soil Before results are from beneath UST 4/7/00. Soil After results are from boring TP-4S at 15 feet on 7/5/00. Water Before results are grab groundwater sample results from TP-4 on 7/5/00. Water After results are from the monitoring wells on 4/11/03. IV. Closure Does completed corrective action protect existing beneficial uses per the Regional Board Basin Plan? Yes Does completed corrective action protect potential beneficial uses per the Regional Board Basin Plan? Yes Does corrective action protect public health for current land use? Yes Site management requirements: None Should corrective action be reviewed if land use changes? Monitoring/Vapor wells decommissioned: No Number Decommissioned: 0 Number retained:4 List enforcement actions taken: NOR List enforcement actions rescinded: V. Local Agency Representative Data Name: Margaret Lagorio Title: Supervising REHS Signature: L/I Date: r VI. Central Valley Regional Water Quality Control Board (RB)Notification Date Submitted to RB: Response Date: RB Staff: James L.L. Barton Response: Title:Associate Engineering Geologist VII. Additional Comments, Data, etc. This document and the related CASE CLOSURE LETTER, Shall be retained by the lead agency as part of the official site file.