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<br />• The channel was designed to have a trapezoidal shape with a 6-foot bottom width, 3H:1 V side <br />slopes, and a minimum depth of 3 feet. The side slopes and bottom width were visually checked <br />along the entire length by the Field Engineer. Once the channel met the design specifications, <br />riprap was placed. <br />Riprap was taken from two on-site stockpiles. The riprap consisted of two sizes, minus 12-inch <br />and minus 18-inch. Although the required mean rock size (DSO) was specified as 3 and 5 inches, <br />the on-site riprap was utilized. As previously discussed, the transition point from the steeper <br />slope to the flatter slope is at about Station 5+50. The minus 18-inch rock was used on the <br />upper, steeper section of the channel, and the minus 12-inch rock was used for the flatter channel <br />segment. Use of riprap larger than the specified sizes will not detract from the stability of the <br />channel. <br />The lazge size of the riprap made it difficult to place the rock and still maintain a trapezoidal <br />cross-sectional azea. Due to potential concerns regarding channel flow capacity, BMRI <br />• completed channel modification during the week of August 1 to reduce channel irtegularities and <br />thus enhance flow capacity. The resulting modified channel configuration was surveyed and <br />found to comply with the design requirements. <br />3.0 EVAPORATION SYSTEM <br />The pumps, evaporative sprayers, and water lines were placed according to the plans and <br />specifications. The concrete pads supporting the pumps and the five evaporative sprayers were <br />constructed as shown in the design drawings. The water line was constructed from 6-inch <br />diameter Standard Dimension Ratio (SDR) 11 HDPE pipe, and pipe connections were welded <br />according to manufacturer specifications and visually checked by the Field Engineer. The water <br />line was secured to the evaporative sprayer pads in order to prevent movement. The model of <br />evaporator used was the Turbo Mist 30P manufactured by Slimline Mfg. Inc. <br />U <br />Battle Mountain Resources, Inc. 4 August 10, 1999 <br />