SITE INFORMATION AND CORRESPONDENCE

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`wle 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) 2,200 1,000 12 14 Ethylbenene 14 28 .830 .920 TPH (Diesel) Xylene 300 110 2.8 1.3 Benzene 11 4.6 .028 <.005 Toluene 390 54 .033 <.011 MTBE <.500 <.050 Comments: All levels in ppm. Soil Before levels from excavation sidewall soil sample on 4/16/93. Soil After levels from excavation bottom soil sample on 5/25193. Groundwater Before levels from MW1 on 4/12/96. Groundwater After levels from MW1 on 6/16/97. 1023 tons of contaminated soil removed in April- May 1993. II 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No Number Decommissioned: 0 Number retained: 3 List enforcement actions taken: NOR I List enforcement actions rescinded: None V. Local Agency Representative Data Name: Margaret Lagorio Title: Supervising REHS Signature: Date: VI. Central Valley Regional Water Quality Control Board (RB) Notification Date Submitted to RB: Response Date: RB Staff: P. Anderson Response: Title: Hydrogeologist 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.