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• and miscellaneous costs. The total job cost for Alternate No. 3 is <br />$575,100. This cost does not include possible physical conflicts with <br />the existing Grand Junction water intake. <br />b. The design life of this project is estimated as 5U <br />years, taking into consideration the age (fib years old) of the existing <br />dam structure. During the life of the project, the large mechanical <br />equipment items should only require proper maintenance. This alternate <br />should not incur any major replacement costs during the life of the <br />project. <br />F. Alternate No. 4. <br />1. Description of Major Features. <br />a. This alternate closely relates to preliminary Alternates <br />C and D described previously. The entrances to the fishway all lead into <br />a collection channel. The collection channel was proposed to eliminate <br />the need for two separate fish ladders. The channel leads fish up to an <br />American Fishways ladder that raises 12 feet in two circular rotations to <br />the exit and trap. The exit leads into the power canal and fish swim into <br />the river through the headgates or a new open channel. The slope of the <br />ladder floor is 1 foot vertical to 12 feet horizontal. This fishway does <br />not have any provisions to adjust the velocities within the baffled flume. <br />b. The fishway exit area is large enough to accommodate an <br />8-foot-wide, 16-foot-long, 5-foot-high trap. The fish are guided into <br />the trap through a V-shaped notch in the trap structure. Fish easily <br />find their way into the trap but do not easily find their way out through <br />the notch. The trap allows for exiting or trapping of fish by means of <br />an upstream gate. The downstream end of the notch can be closed and the <br />fish can be crowded to the water surf ace for observation or tagging. <br />Fish can also be removed from the ladder, while being contained in the <br />trap, by means of a hoist. <br />c. This alternate provides vertical bar screens downstream <br />from the ladder exit in the power canal, if necessary. These screens <br />will prevent downstream passage of adults toward the powerhouse. A trash <br />shear boom is also provided to reduce maintenance problems for the fish <br />ladder and fish screens in the power canal. <br />d. The ladder also provides auxiliary attraction water at <br />the upstream fish entrance in the collection channel. Water enters fran <br />the power canal through a trashrack under the ladder exit and is piped to <br />• the diffuser. A valve is provided at the diffuser to adjust the quantity <br />of water. The maximum velocity into the trashrack and from the diffuser <br />31 <br />