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r <br /> r _ <br /> Case Closure Summary Page 2 <br /> Leaking Underground Fuel Storage Tank Program <br /> III Release and Site Characterization Information (continued) <br /> �t <br /> Maximum Documented Contaminant Concentrations -- Before and After Cleanup <br /> Contaminant Soil (ppm) Water (ppm) Contaminant Soil (ppm) Water (ppm) <br /> Before Alter Before After Before After Before After <br /> TPH (Gas) 48,000 21,000 <.05 <.05 Ethylbenene 910 490 .00072 <.0005 <br /> TPH (Diesel) Xylene 6,100 4,400 .0028 <.0005 . <br /> Benzene <250 <.5 <.0005 <.0005 'CCE <br /> Toluene 3,900 31 .00052 <.0005 PCE <br /> MTBE 180 1.8 .041 <br /> Comments: Soil Before results are from beneath piping removed on 913/93 at 6 feet below surface grade. Soil After results <br /> are from confirmation boring CB-10 on 2111199, except MTBE which is from MW1-50 on 8123/99. Water Before results are <br /> from MW1 on 1111/00. Water After results are from MW3 on 6/17/02. Vapor extraction was conducted from 2/25/98 until <br /> 2199. <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?Yes <br /> MonitoringNapor wells decommissioned: No Number Decommissioned: 0 Number retained: 6 <br /> List enforcement actions taken: NOR <br /> List enforcement actions rescinded: <br /> V. Local Agency Representative Data <br /> Name: Margaret Lagorio Title: Supervising REHS <br /> Signature: Date: Q 1.5 10 y <br /> VI. Central Valley Regional Water Quality Control Board (RB) Notification <br /> Date Submitted to RB: Response Date: <br /> RB Staff: Mark List Response: <br /> Title: Engineering Geologist <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 /> i <br />