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+" <br />JOHN F. ABEL, JR. <br />MINING ENGINEER <br />Mr, Steve Fearn <br />Silver Wing Co. <br />P.O. Box 299 <br />Silverton, CO 81433 <br />~~99~~'~~~~~ <br />~~ w~ _ _VY <br />~O,,,r~ o~"e <br />~ GQ%9Y <br />310 LOOKOUT VIEW COURT <br />GOLDEN, CO 80401 <br />303-279-4901 <br />FAX 278163 <br />JFAEel2®f asiro( <br />September 8, 2003 <br />Reference: Final Koehler Tunnel bulkhead inspection <br />Dear Steve: <br />This letter report presents my inspection of the Koehler <br />Tunnel bulkhead form on September 5, 2003. The as built bulkhead <br />preparations meet all the design criteria. Filling of the <br />bulkhead form should proceed when the concrete is available. <br />I arrived at the bulkhead location at approximately 1:30 p.m. <br />and entered the bulkhead for the inspection. All but one of the <br />horizontal and two of the vertical #10 bars had been tied into the <br />downstream (airside) cage at a minimum 4 inches from the form <br />plywood, exceeding the minimum 3.5 inches required. The three <br />bars not fully tied into the cage permitted access into the <br />bulkhead form for the inspection and final cleaning of the form <br />floor, immediately before filling. The untied horizontal bar was <br />temporarily tied below the access opening, ready for positioning <br />when the concrete pour reaches that elevation. The two vertical <br />bars in front of the access opening had been spread sideways nor <br />access at the top of the form and were tied into the cage near the <br />floor. They will be pulled back and tied into the cage as the <br />concrete rises in the form. All the #6 bars had been tied into <br />the upstream (waterside) cage at the minimum 3.5 inches from the <br />form plywood. The two-way airside rebar had been tied into the <br />cage on the specified 14-in centers and the two-way waterside <br />rebar had been tied into the cage on the specified 12-in centers. <br />All the loose rock on the perimeter of the nominal 12-ft <br />thick bulkhead location between Stations 3+0,2 and 3+14 had been <br />completely scaled. The resulting rock surface was clean, exposing <br />fresh rock everywhere. The 4-in diameter stainless steel bypass <br />pipe, complete with the combination thrust/waterstop plate welded <br />in the center of the bulkhead, was installed and functioning. Two <br />additional waterstops were welded along the bypass pipe, halfway <br />between the combination thrust/waterstop and each form face. Trim <br />1 <br />