SITE INFORMATION AND CORRESPONDENCE

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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) <0.52 <0.53 <0.100 NA Ethylbenzene <0.0052 <0.0053 <0.001 NA TPH(Diesel) 240 <4.2 0.045 NA Xylenes <0.016 <0.016 <0.003 NA Benzene <0.0052 <0.0053 <0.001 NA MTBE <0.0052 <0.0053 <0.001 NA Toluene <0.026 <0.026 <0.005 NA 1.2 DCA NA NA NA NA Heavy metals NA NA NA NA Comments: Soil Before analytical data are taken from sample D6-1.5 collected on 5122109; Soil After analytical data are taken from soil boring sample SB-1 collected on 02104110. Water Before analytical data are taken from soil boring sample SB-1 collected on 02104110;Water After analytical data are not available. NA—not analyzed 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: Not applicable Number Decommissioned: 0 Number retained: 0 List enforcement actions taken: NOR List enforcement actions rescinded: None V. Local Agency Representative Data Name: Donna Heran, REHS Title: Director Signature: Date: VI. Central Valley Regional Water Quality Control Board (RB) Notification Date Submitted to RB: May 19, 2011 Response Date: June 9, 2011 RB Staff: James L.L. Barton Response: Concurrence 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.