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The weir system proposed for installation at Site IR- 14 consists of three weir stacks with each <br /> stack containing two single side channels and one double center channel for a total of four channels per <br /> stack . As a result , the IR- 14 installation will require 12 separate 2x8 flange extensions . Each 2x8 flange <br /> extension must be fabricated from a single board to extend the full 13 . 9- ft range of adjustability required <br /> by the IR- 14 facility, from - 1 . 2 ft NGVD to at least + 12 . 7 ft NGVD . The first elevation corresponds to the <br /> height of the base plate or sill of each weir stack. The second elevation corresponds to the maximum <br /> allowable water level in the IR- 14 basin to maintain the required 2 ft freeboard below the + 14 . 7- ft <br /> elevation of the dike crest . <br /> The contractor will permanently attach each 2x8 flange extension to the I-beam flange as follows : <br /> 1 . Drill a series of holes , 2-ft on center and arranged vertically , through the center of the <br /> C-channel flange (that is , 1 % in . from the flange ' s edge) to accept 5/ 16-in . x 3 -in . <br /> stainless steel bolts . <br /> 2 . Chamfer one corner of each 2x8 flange extension to clear the filet of the I-beam <br /> channel and thereby allow one edge of the 2x8 to seat against the I-beam' s web (Figure <br /> 2 . 1a) . <br /> 3 . If necessary, plane one face of the 2x8 flange extension to match, as closely as <br /> possible, the taper of the I-beam flange . <br /> 4 . With the 13 . 9-ft+ base of the flange extension firmly seated on the weir base plate and <br /> the edge of the flange extension firmly seated on the I-beam web, mark then drill <br /> matching holes in the extension. <br /> 5 . On the upstream face of the flange extension , counter-sink the holes 3/ in. to accept a <br /> nut and washer. <br /> 6 . Begin installation of the flange extensions by placing a bed of roofing asphalt on the <br /> weir base plate to receive and seal the bottom of the flange extension. <br /> 7 . To improve the seal between the flange extension and the I-beam channel ' s bituminous <br /> coating, wrap the mating surfaces (edge and face) of the flange extension with a <br /> continuous gasket fabricated from rubber, neoprene, heavy roofing felt, or other <br /> approved materials . <br /> 8 . Firmly seat the extensions against the weir base plate and the inner face and web of the <br /> I-beam channels . <br /> 9 . Align the holes with the pre-drilled holes in the C-channel flange . <br /> . 7 - <br />