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) 830 830 114 <.05 Xylene 3.90 3.90 17.50 <0.0005 TPH (Diesel) <1.0 NA 160 1.070 Ethylbenzene 3.80 3.80 2.92 <0.0005 Benzene <0.5 <0.5 0.735 <0.0005 Oil &Grease NA NA NA NA Toluene <0.5 <0.5 15.50 <0.0005 Heavy Metals 7.70 Pb 7.70 Pb 0.048 Pb NA MTBE Unk Unk 15.10 0.0006 Comments: The soil before and the soil after concentrations are from sample TB-2 (the source area)taken at 12.5 feet bgs at the time of UST removals. The ground water before and the ground water after concentrations are from MW4 located within 10 feet of the tank pit and TB-2 (the source area). 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: NIA Should corrective action be reviewed if land use changes?Yes MonitoringlVapor wells decommissioned: No Number Decommissioned: 0 Number retained: 4 List enforcement actions taken: Level One, NOR sent to the RP List enforcement actions rescinded: None V. Local Agency Re resentative Data Name: Adrienne Ellsaesser Title: : Acting Program Coordinator Signature: Date: !� VI. Cen ral Valley Regional Water Quality Control Board RB Notification Date Submitted to RB: Response Date: RB Staff: J. Barton Response. Title: Eng. Geologist VII. Additional Comments, Data, etc. IF- This document and the related CASE CLOSURE LETTER, Shall be retained by the lead agency as part of the official site file.