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Case Closure Summary: Exhibit N Page 1 of 2 p <br /> 11 <br /> Case Closure Summary Page 2 <br /> Leaking Underground Fuel Storage Tank Program <br /> Ill Release and Site Characterization Information (continued) : <br /> �f t <br /> ,3 k <br /> Maximum Documented Contaminant Concentrations-- Before and After Cleanup <br /> Contaminant Soil Before(ppb) (ppb) After Water Before (ppb)After <br /> TPH gas ND ND 'I NA <br /> TPH diesel ND NA NA <br /> Toluene 7 ND ND <br /> Benzene 15 ND 3. ND <br /> Xylene 12 ND I; ND <br /> MTBE 45 ND j ND <br /> Ethyl Benzene ND ND ND <br /> TAME 440 NID NA <br /> TBA, DIPE, ND NA <br /> NDD <br /> ETBE N <br /> ND <br /> No remediation required. Soil Before results are from samples beneath the tanks at the time of their removal on 06110198. <br /> f The highest soil contaminant concentrations were in stockpiled soil that was disposed of at Altamont Landfill. Soil After i <br /> samples are from borings on 08109199. Groundwater Before results are from a water sample collected from a boring on <br /> 3122100. <br /> IV. Closure 'f <br /> �3I a <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 lRegio nnal 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? Yes I� s <br /> Monitoring wells decommissioned: NA Number Decommissioned: 0 Number retained: NA ► <br /> List enforcement actions taken: NOR sent ;j r <br /> List enforcement actions rescinded: None I} <br /> E V. Local Agency Representative Data <br /> �I k <br /> 'r <br /> Name: DONN ERAN Title: DIRECTOR OF ENVIRONMENTAL HEALTH <br /> Signature: ,v. _ Date: f' 03;;;-0� <br /> VI. Central Valley Regional Water Quality Control Board (RB) NotificatIj ion <br /> , <br /> Date Submitted to RB: 4121100 Response,Date:-5/25/00 <br /> RB Staff: Marty Hartzell Response: Concurrence <br /> Title: Engineering Geologist <br /> VII. Additional Comments, Data, etc. <br /> f Minimal soil contamination, no groundwater contamination detected. <br /> This document and the related CASE CLOSURE LETTER, Shall be retained by the lead agency as part of the <br /> official site file. (08124193) Exhibit N Page 2 of 2 <br /> I� P <br /> i <br />