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Case Closure Summary Page 2 <br /> Leaki- underground Fuel Storage Tank <br /> III. Release and Site Char.` 'arization Information (continue <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) 1800 1.3 N/A N/A Xylene 23.0 ¢23.0 N/A N/A t <br /> TPH (Diesel) 29 <29 N/A N/A Ethylbenzene 6.4 c6.4 N/A N/A <br /> Benzene X0.4 .0017 X/A N/A Oil & Grease - N/A N/A N/A <br /> Toluene 0.83 c0.83 N/A N/A Heavy metals - N/A N/A N/A <br /> Otheri - - N/A N/A Other - N/A N/A <br /> Comments (Depth of Remediation, etc.) : 7 <br /> TANK #6 AND #16 SUCCESSFULLY OVEREXCAVATED. TANK #4 AND #5 OVEREXCAVATED AND THEN <br /> REMEDIATED UTILIZING A VAPOR EXTRACTION SYSTEM WHICH OPERATED 'FROM 11/04/94 TO '05/06/95. <br /> THE REMAINING CONTAMINATION MASS IS ESTIMATED TO BE 5 POUNDS. <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: <br /> Should, corrective action be reviewed if land use changes? (Yes) No <br /> Monitoring wells Decommisioned: Yes • No Number Decommisioned: Number Retained: <br /> List enforcement actions taken: LEVEL #1 <br /> I <br /> List enforcement actions rescinded: <br /> a <br /> V. Local Agency Representative Data' <br /> Name: DO HERAN Title: DIRECTOR OF ENVIRONMENTAL HEALTH <br /> Signature: Date: <br /> VI. RWQCB Notification <br /> Date Submitted to RB: RB Response: <br /> RWQCB Staff Name:E THAYER Title:ASSOC ENGINEER Date: <br /> VII. Additional Comments, Data, etc. <br /> SOIL ONLY- VES REDUCED TPH MASS AND VOLATILES AFTER OVEREXCAVATION. <br /> j <br /> i <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 /> - R.: JrJ <br />