SITE INFORMATION AND CORRESPONDENCE

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Y Case Closure Summary Pa �eaking Underground Fuel Storage Tankylgram 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) 64.0 3.0 xxxxxx xxxxxx Xylene 0.9 0.02 xxxxxx xxxxxx TPH(Diesel) 5,200 ND xxxxxx xxxxxx Ethylbenzene 0.3 0.05 xxxxxx xxxxxx Benzene 0.008 0.073 xxxxxx xxxxxx Oil&Grease NA NA xxxxxx xxxxxx Toluene 0.012 0.15 xxxxxx xxxxxx Heavy Metals NA NA xxxxxx xxxxxx MTBE 0.18 0.18 xxxxxx xxxxxx Comments: 'Before' results from the tank removal sampling; 'After"results from the over-excavation sampling. 'Before'MTBE sample from dispenser, D-2, at 6 feet bsg. 'After' MTBE sample from over-escavation,WX-9,at 20 feet bsg. 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0 Number Decommissioned: 0 Number retained: 0 List enforcement actions taken: NOR List enforcement actions rescinded: NONE V. Local Agency Representative Data Name: DOT LOFSTROM, RG Title: ENGINEERING GEOLOGIST, SITE MITIGATION UNIT Signature: il Date: /C)//(o 1 O VI. Central Valley Regional Water Quality Control Board (RB) Notification Date Submitted to RB: Response Date: RB Staff: MARTY HARTZELL, Response: Title: ASSOC ENG GEOLOGIST VII. Additional Comments, Data,etc. SOIL ONLY; DEPTH TO GROUNDWATER ANTICIPATED TO BE APPROXIMATELY 60 FEET BSG OR GREATER. This document and the related CASE CLOSURE LETTER,Shall be retained by the lead agency as part of the official site file.