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Case Closure Summary Page r <br /> Leaking Underground Fuel Storage Tank irogram <br /> ill Release and Site Characterization information (continued) <br /> Maximum Documented Contaminant Concentrations --Before and After Cleanup <br /> Contaminant Soil Soil Water Water Contaminant Soil Soil Water Water <br /> Before After Before After Before After Before After <br /> i <br /> (ppm) (ppm) (ppb) (ppb) (ppm) (ppm) (ppb) (ppb) i <br /> TPHdiesel 5200 ND NA i NA I TPHmo 3800 ND <br /> Toluene 0.035 ND . <br /> Ethylbenzene 0.093 ND <br /> Xylene 0.98 ND <br /> MTBE ND ND k� <br /> Comments: Soil Before samples were stockpile soil that was returned to UST pit. 'Soil After samples were from beneath <br /> UST at 15 feet bsg and beneath the piping at 10.5 feet bsg. No water was encountered. Contaminated stockpile was <br /> replaced back into UST excavation on top of clean fill.Analysis for MTBE was performed on the soil samples collected <br /> beneath the piping and dispenser on 1011197. <br /> IV. Closure <br /> Does completed corrective action protect existing beneficial uses per the Regional Board Basin Plan? Yes <br /> Does completed corrective action protect potential beneficial uses per the Regional Board Basin Plan? Yes + <br /> Does corrective action protect public health for current land use? Yes <br /> Site management requirements: none <br /> Should corrective.action be reviewed if land use changes? NO <br /> Monitoring wells decommissioned: NA Number Decommissioned: NA Number retained: 0 <br /> List enforcement actions taken: NOR sent <br /> List enforcement actions rescinded: None <br /> V. Local Agency Representative Data <br /> Name: Donna Heran r t t1 Title: Director of Environmental Health <br /> Signature: Date: ,s It q <br /> VI. Central Valley Regional Water Quality Control Board (RB)Notification 1 <br /> Date Submitted to RB: Response Date: <br /> i <br /> RB Staff: Mark List Response: � <br /> Title: Engineering Geologist <br /> VII. Additional Comments, Data, etc. <br /> Soil only contamination. Approximately 130 tons of soil with an average concentration of 805 mg/kg TPHd and 35 tons of <br /> soil with an average of 1200 mg/kg of TPHmo was calculated as being used to complete the filling of the UST,excavation. <br /> Approximately 40 feet of soil separate the contaminated soil from.groundwater. <br /> This document and the related CASE CLOSURE.LETTER,Shall be retained by the lead agency as part of the official site file. <br /> (08124193) Exhibit N Page 2 of 2 <br />