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Case Closure Summary Page 2 <br /> Leaki�IInderground Fuel Storage Tank + rgram <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) Xylene 6.7 .89 .130 ND <br /> TPH (Diesel) 740 64 110 ND Ethylbenzene 4.5 1.3 NA ND <br /> Benzene .065 .05 1 .042 ND Oil & Grease <br /> Toluene .13 .34 ND Heavy metals <br /> Other Other <br /> Comments (Depth of Remediation, etc.) : Highest DTW in MW1 on 5/30/90 and lowest in MW3 on <br /> 10/09/92. Concentrations detected in soil (before) were obtained from SBI on 7/27/92 and <br /> after from TPWW on 10/8/92 after the excavation attempt. Residual soil contamination was <br /> defined by B2 on 6/25/93. <br /> IV. Closure <br /> Does completed corrective action protect existing beneficial uses per the Regional Board <br /> Basin Plan? (Yes) No <br /> Does completed corrective action protect potential beneficial uses per the Regional Board <br /> Basin Plan? (Yes) No <br /> Does corrective action protect public health for current land use? (Yes) No <br /> Site management requirements: None following monitoring well destruction. <br /> Should corrective action be reviewed if land use changes? Yes (No) <br /> Monitoring wells Decommisioned: (Yes)No Number Decommisioned: 4 Number Retained: 0 <br /> List enforcement actions taken: NOR on 1/15/89 and 1/14/91. <br /> List enforcement actions rescinded: None <br /> Its <br /> V. Local Agency Representative Data <br /> Name: Donna Berea Title: Director <br /> Signature: Date: <br /> VI. RWQCB Notification <br /> Date Submitted to RB: 04/13/94 RB Response: verbal concurrance <br /> RWQCB Staff Name: Gordon Boggs Title: Program Coord. Date: 01/02/96 <br /> VII. Additional Comments, Data, etc. <br /> Greg Stahl, RG 5023 currently of Ground Zero estimated that the residual petroleum <br /> hydrocarbon contamination remaining is approximately 15 pounds and will not pose a <br /> future threat to groundwater <br /> This document and the related CASE CLOSURE LETTER, Shall be retained by the lead agency <br /> as part of the official site file. (08/24/93) <br /> Exhibit N Page 2 of 2 <br />