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- Case Closure Summary Page 2. U <br /> Leaking Underground Fuel iStorage Tank Program <br /> 111 Release and Site Characterization Information (continued) <br /> Maximum Documented Contaminant Concentrations,; <br /> Contaminant Soil Before(ppm) Soil After(ppm) Water Before(ppm) Water After(ppm) <br /> TPH-E(Diesel) 8.2 '--- """- <br /> TPH-E(Oil) 280 <10 .1 <.50 <br /> < <br /> TPH-Purgeable 12,000 <1.0 <.10 <.05 <br /> Benzene <2 <.005 <.0005 <.0005 <br /> Toluene <2 <.005 .0006 <.000&11 <br /> Ethylbenzene 7.1 <.005 <.0005 .0005 <br /> 0005 <br /> MTBE <br /> <.005 <.0005 <br /> < <br /> Xylene <2 006 <.005 <.0005 <.0005 <br /> Soil and Water Before Results are from samples collected beneath the UST at the time of removal. Soil and Water After <br /> Results are from Geoprobe sampling 8130100. Tanks were removed in April 2000 and soil sampled at 16 feet below surface <br /> grade. Stockpiled soil was used to fill the excavation when subsequent investigation and laboratory analyses of samples <br /> water. Beneficial uses of groundwater are protected, now and in the future. <br /> indicated minimal impact to soil and ground <br /> P <br /> TV. 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 wells decommissioned: NIA Number Decommissioned: NIA. Number retained: NIA <br /> List enforcement actions taken: NOR sent <br /> List enforcement actions rescinded: None <br /> V. Local Agency Representative Data <br /> Name: Margaret Lagorio Title: Supervising RENS <br /> Signature: I Date: i I <br /> VI. Central Valley Regional Water Quality Control Board (RB) Notification <br /> Date Submitted to RB: Response Date: <br /> 4 <br /> RB Staff: Marty Hartzell Response: <br /> Title: Assoc Eng Geologist <br /> VII. Additional Comments, Data, etc. <br /> I <br /> This document and the related CASE CLOSURE LETTER, Shall be retained by the lead agency as part of the <br /> official site file. (08/24193) Exhibit N Page 2 of 2 <br />