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• + Case Closure Summary Page 2 AOW% <br /> Leaking Underground Fuel Storage Tank t-igram <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) 40000 ND 28 ND Xylene 520 ND 11 ND <br /> TPH (Diesel) Ethylbenzene 100 ND .290 ND <br /> Benzene 20 ND .390 ND Oil & Grease <br /> Toluene 140 ND .260 ND Heavy metals <br /> other Other <br /> Comments (Depth of Remediation, etc.) : <br /> Sheen on groundwater from 4/92 to 1/93. Vapor extraction conducted from 4/93-10/93, <br /> 12/94-3/95, 7/95-8/95, and pulsed from 8/95-12/95. <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: 6 Number Retained: 0 <br /> List enforcement actions taken: NOR dated 5/19/89 <br /> List enforcement actions rescinded: <br /> V. Local Agency Representative Data <br /> Name: DonnarVeran Title: Director Environmental Health Division <br /> Signature: Date: 7 <br /> VI. RWQCB Notification <br /> Date Submitted to RB: 9/5/96 RB Response: Concurrence <br /> RWQCB Staff Name: J. Brathovde Title: Asso. Eng. Geo. Date: 11/27/96 <br /> VII. Additional Comments, Data, etc. <br /> Groundwater samples and confirmation soil samples from borings indicated vapor <br /> extraction and natural bioremediation has removed contamination from soil and <br /> 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 />