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Case Closure Summary Page ) <br /> i"l�r <br /> Leaking Underground Fuel Storage Tan bgram <br /> - <br /> Release and Site C haractedzation information (continued} <br /> 111 <br /> maximum Documented Contaminant Concentrations --Before and After Cleanup Water 'Water <br /> M Soil Sod <br /> Soil Before After <br /> SWater Water Contaminant <br /> Soil l Befine (ppb) <br /> Contaminant Before After Before , (Ppm) (ppb)After (pp ) <br /> (ppm) (ppm) (ppb) (ppb) <br /> NA TPHma 3800 NO <br /> 5200 ND NA i <br /> TpHdiesel NO <br /> Toluene 0.035 <br /> Ethylbenzene 0.93 ND <br /> Xylene 0.98 ND <br /> MTBE ND ND <br /> ere from les were stockpile soil that was returned to USS uin Bred. Contaminated stockpile was beneath <br /> Comil After samples w <br /> ments: Soil Before samples in at 10.5 feet bsg. No water was en <br /> UST at 15 feet bsg and beneath the piping <br /> laced back into UST excavation on top of clean fill.Analysis for MTBE was performed on the soil samples collected <br /> replaced <br /> beneath the piping n and dispenser on 70!1197. <br /> IV. Closure <br /> EDoescomplletedcorrective action protect existing beneficial uses per the Regional Board Basin Plan? Yes <br /> eted corrective actionprotect potential beneficial uses per the Regional Board'Basin flan? Yes <br /> ctive 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 List enforcement actions rescinded: None 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: D a Heran Title: Director of Environmental Health <br /> Signature: �r-y�.�, ' Date: C <br /> VI. Central Valley Regional Water Quality Control Board (RB) Notification <br /> Date Submitted to RB: 4113199 Response Date: <br /> RB Staff: Mark List Response. No response as of 6/1199 <br /> Title: Engineering Geologist <br /> V11. 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 excavationJ <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 /> (08/24193) Exhibit N Page 2 of 2 <br />