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Case Closure Summary Page 2 <br /> Leaking Underground Fuel Storage Tank Program <br /> III Release and Site Characterization Information (continued) <br /> Maximum Documented Contaminant Concentrations - - Before and After Cleanup <br /> Contaminant Soil (ppm) Water (ppm) Contaminant Soil (ppm) Water (ppm) <br /> Before After Before After Before After Before After <br /> TPH (Gas) 13,000 4,300 100 .430 Ethylbenene 170 .78 2.3 .023 <br /> TPH (Diesel) Xylene 1500 12 7 .0049 <br /> Benzene 18 <.4 21 .00092 <br /> Toluene 270 <.4 17 <.0009 MTBE <.009 <br /> Comments: All levels in ppm. Soil Before BTX levels from soil below UST at time of removal, EB result from RW1 at 35' <br /> below grade, TPH-g level from P2 at 40' below grade. Soil After levels are from P5 at 40' below grade, at 55' below grade <br /> was ND. Groundwater Before is from MWi on 1017193. Groundwater After is from MW4 on 10123197, <br /> L_ - <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 /> I <br /> Should corrective action be reviewed if land use changes? Yes <br /> MonitoringNapor wells decommissioned: No Number Decommissioned: 0 Number retained: 11 <br /> List enforcement actions taken: NOR <br /> List enforcement actions rescinded: None <br /> V. Local Agency Representative Data <br /> Name: Margaret Lagorio Title: Supervising RENS <br /> Signature: Date: ( �� T <br /> r' <br /> VI. Central Valley Regional Water Quality Control Board (RB) Notification <br /> Date Submitted to RB: Response Date: <br /> RB Staff: P. Anderson Response: <br /> Title: Hydrogeologist <br /> VII. Additional Comments, Data, etc. <br /> This document and the related CASE CLOSURE LETTER, Shall be retained by the lead agency as part of the official <br /> site file. <br />