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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(Motor Oil) 9600 1800 NA NA Ethylbenene .054 <.005 NA NA <br /> TPH(Diesel) 8100 280 NA NA Xylene .14 <.005 NA NA <br /> Benzene <.022 <.005 NA NA 8270 Scan <.5 <.05 <.05 <br /> Toluene <.010 <.005 NA NA MTBE NA <.05 NA NA <br /> TRPH 13,000 13,000 1.1 <.5 <br /> Comments: TRPH Results from beneath sump in courtyard area. No cleanup of this area was required because the <br /> contamination was limited and access to the area is limited. Soil Before and After for all other contaminants are from the <br /> 210,000 gallon UST area which was over-excavated. Soil Before Results for TPH-d and TPH-mo are from T9. Soil After <br /> Results for TPH-d and TPH-mo are from T20 &T18. Soil Before Results for BTEX are from T3. Soil After Results for <br /> BTEX are from all samples. Water Before Results are from MW2 on 6/10/93. Water After Results are from all wells on <br /> 6/24/99. A h dro unch grab water sample from the courtyard area did evidence 1.8 m TPH-d and 2.7_ppm TPH-mo. <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 /> Monitoring/Vapor wells decommissioned: No Number Decommissioned: 0 Number retained: 4 <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 List enforcement actions rescinded: 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: <br /> VI. Central Valley Regional Water Quality Control Board (RB) Notification l <br /> Date Submitted to RB: Response Date: <br /> RB Staff: Marty Hartzell 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 />