SITE INFORMATION AND CORRESPONDENCE

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Case Closure SummaryPz!� ,eaking Underground Fuel Storage TFI---- ram 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 Atter Before After TPH (Gas) 23,000 950.0 sheen <0.050 ylene 1,500 80.0 27,000 <0.005 TPH (Diesel) NIA thylbenzene 610 1.3 unknown <0.005 Benzene 150 <0.50 7,900 <0.005 it &Grease NIA Toluene 2,100 <0.50 21,000 <0,005 eavy Metals NIA TBE unknown unknown unknown .0063 Comments: Residual soil contamination (gasoline)exists ir NE quadrent of former tank field as evidenced in confirmation boring CB-4IVEW-1 completed 09107194. The h st round of groundwater sample results were below detection limits for gas and BTEX. MW#35 has 6.3 ppb MT E. 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: I Should corrective action be reviewed if land use changes? (YES) Monitoring/Vapor wells decommissioned: (YES) Number Decommissioned: 36 Number retained: 0 List enforcement actions taken: NOR sent to Responsible Party; 151 level enforcement. List enforcement actions rescinded: V. Local Agency Representative Data Name: Donna Heran Title: Director of Environmental Health Signature: Date: Vl. Central Valley Regional Water Quality Control Board (RB) Notification Date Submitted to RB: 08/19197 Response Date: 08/28/97 RB Staff: J. Brathovde Response: Title: Assoc 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.