SITE INFORMATION AND CORRESPONDENCE

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i r +V 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) 1,400 80 0.62 <0.050 Ethylbenzene 32 0.13 <0.0005 <0.0005 TPH(Diesel) NA NA NA NA Xylenes 190 1.0 0.0088 <0.0005 Benzene 4.3 <0.005 <0.0005 <0.0005 MTBE 39 0.31 0.52 0.0060 Toluene 46 0.12 0.0036 <0.0005 1,2-DCA NA NA <0.0005 NA Lead I NA I NA I NA I NA Comments: The`soil before' concentrations are taken from sample T2N on 912211998. The 'soil after' concentrations are taken from sample North East(north wall east end)on 11/10/1998. The groundwater before and after concentrations are taken from MW-1 on 05/17/2006 and 06/16/2010, respectively. NA—not anal zed 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: No Number Decommissioned: 0 Number retained: 3 List enforcement actions taken: NOR List enforcement actions rescinded: None V. Local Agency Representative Data Name: Adrienne Ellsaesser, REHS Title: Acting Program Coordinator Signature �n1 r&r& �J Date: Vl. 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.