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The northern adit (Water Tunnel Level) is presently closed with a wooden cover. The cover <br /> must be removed prior to installation of the steel grating. The Project Manager will designate the <br /> location for the steel grating. The northern adit currently has inside dimensions of 7.5 feet high <br /> by 8 feet wide. <br /> The southern adit (Butte Tunnel) is currently open. The adit has inside dimensions of 7.5 to 8 <br /> feet in height by 9 feet wide. <br /> No concrete footing is required at either adit. An angle iron frame must be placed along the <br /> bottom of the steel grating. Number 6 rebar must be driven into the floor of the adits on 12-inch <br /> centers, to a depth of two feet or refusal. The rebar must then be welded to the angle iron <br /> frame. If there is ice at the grating location, the ice must be removed prior to installation of the <br /> steel grate. <br /> Return by 4:00 p.m., September 8, 1999 to: <br /> Yvonne Brannon <br /> 1313 Sherman St., #215 <br /> Denver, CO 90203 <br /> Fax (303) 832-8106 <br />