SITE INFORMATION AND CORRESPONDENCE

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4r 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) 1600 <1 <.05 Ethylbenene .14 <.005 <.0005 TPH (Diesel) 18000 <10 <.05 Xylene .96 <.005 <.0006 Benzene <.01 <.005 <.0005 MTBE <.01 <.005 <.001 Toluene <.01 <.005 <.0005 Comments: Soil before results are from the soil sample collected beneath the piping at PP-1 in September 2002. Soil after results are from soil samples collected from borings performed March 2003. Groundwater before is from the borings performed in March 2003. Contamination limited to soil beneath replaced piping. 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? Yes Monitoring/Vapor wells decommissioned: NA Number Decommissioned: Number retained: List enforcement actions taken: NOR List enforcement actions rescinded. V. Local Agency Representative Data Name: Margaret Lagorio Title: Supervising REHS Signature: Date: VI. Central Valley Regional Water Quality Control Board (RB) Notification E EJames to RB: Response Date: L.L. Barton Response: Engineering Geologist VII. Additional Comments, Data, etc. Soil Only. This document and the related CASE CLOSURE LETTER, Shall be retained by the lead agency as part of the official site file.