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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) 14000 2200 FP ND Xylene 1900 23 FP ND <br /> TPH (Diesel) Ethylbenzene 340 1.4 FP ND <br /> Benzene 410 ND FP ND Oil & Grease <br /> Toluene 1100 NS FP ND Heavy metals <br /> Other Other <br /> Comments (Depth of Remediation, etc.) : Free product removed Jan-July 1989. Vapor <br /> extraction conducted from 8/15/91 to 12/93. Groundwater samples non-detect when new <br /> monitoring wells were installed in June 1994. Confirmation soil boring show some <br /> residual contamination between 20 and 35 feet below grade. <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 <br /> should corrective action be reviewed if land use changes? Yes (No) <br /> Monitoring wells Decommisioned: (Yes) No Number Decommisioned:10 Number Retained: <br /> List enforcement actions taken: NOR 7/06/89 <br /> List enforcement actions rescinded: None <br /> V. Local Agency Representative Data <br /> Name: onna rDan Title: Director of Environmental Health <br /> ature: Date; "-� —9 <br /> VI. RWQCB Notification <br /> Date Submitted to RB: 3/18/97 RB Response: concurrence <br /> RWQCB Staff Name: J. Brathovde Title:Asso. Eng. Geo. Date: 4/21/97 <br /> VII. Additional Comments, Data, etc. <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 /> s, Exhibit N Page 2 of 2 <br />