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 Before (ppm) Water (ppm) Contaminant Soil Before (ppm) Water (ppm) After Before After After Before After TPH(Gas) 2,600 <1 2.4 0.5 Xylene 400 <.005 0.13 0.0013 TPH(Diesel) NA NA NA NA Ethylbenzene 51 <.005 0.048 0.0003 Benzene 0.86 <.005 0.11 0.0003 Oil&Grease NA NA NA NA Toluene 120 <.005 0.35 0.0008 Heavy Metals ND NA NA NA MTBE 87 <.01 0.077 <.0005 Comments: SOIL BEFORE RESULTS FROM 01/28/00 SOIL BORING B2. SOIL AFTER RESULTS FROM 08/06/03 SOIL BORING 65. BEFORE WATER RESULTS FROM MW-3 ON 06/27/01. AFTER WATER RESULTS FROM MW-3 ON 12/08103. 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: 0 Number Decommissioned: 0 Number retained: 3 List enforcement actions taken: NOR List enforcement actions rescinded: NONE V. Local Agency Representative Data Name: MARGARET LAGORIO, REHS Title: SUPERVISOR, SITE MITIGATION UNIT Signature: Date: Name: 3 Q Lo VI. Central Valley Regional Water Quality Control Board (RB)Notification Date Submitted to RB: Response Date: RB Staff: JAMES L.L. BARTON Response: Title: ENGINEERING GEOLOGIST VII. Additional Comments, Data, etc. I —j This document and the related CASE CLOSURE LETTER,Shall be retained by the lead agency as part of the official site file.