SITE INFORMATION AND CORRESPONDENCE

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v Case Closure Summary Page 2 Leaking Underground Fuel Storage Tank Program Ill. Release and Site Characterization Information continued Maximum Documented Contaminant Concentrations--Before and After Cleanup Contaminant Soil Before (ppm) Water (ppm) Contaminant Soil Before (ppm) Water (ppm) After Before After After Before After TPH(Gas) 19,200 170 19.0 Xylenes 103 12.0 2.1 TPH(Diesel) 1500 <0.05 NA Ethylbenzene 251 3.2 0.750 Benzene 251 42.0 2.4 Motor Oil <5000 NA NA Toluene 1160 51.0 1.2 Heavy Metals <0.5 Pb NA NA MTBE NA <0.50 Comments. The before and after ground water concentrations are from MW-1. The before soil concentrations are from boring AA3-45(45 feet bgs)which was converted to an air sparge remediation well in the source area prior to conducting SVEIIAS; except Diesel, Pb and motor oil results from tank pull samples. No confirmation soil samples were collected. 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: NA Should corrective action be reviewed if land use changes?Yes Monitoring/Remediation Wells Decommissioned?Yes Number Decommissioned:40 Number retained: 0 List enforcement actions taken: NOR sent to RPs List enforcement actions rescinded: None V. Local Agency Re resentative Data Name., Donna Heran, REHS Title: Director Signature: Date. VI. Central Valley Regional Water Quality Control Board RB Notification Date Submitted to RB: February 13, 2012 Response Date: February 29, 2012 RB Staff: J. Barton Response: No Further Action Required Concurrence Title: Eng. 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.