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<br />O~--~~ <br />" ~ u . <br /> <br />downstream from the dam to permit dewatering of the con- <br />struction site. <br /> <br />The Crystal Powerplant will contain one generating unit <br />with a capacity of 28,000 kw, firm operation, and will be <br />located downstream of the left abutment of the dam. <br /> <br />A major construction item will be the concrete operation, <br />both for aggregate processing and concrete batching. The <br />contractor will be required to obtain his aggregate from <br />the river channel. Three possible locations of aggregate <br />within the Gunnison River include the following: the <br />reservoir basin upstream from the dam, the dewatered area <br />between the cofferdams, and the reach of the river below <br />the dam proposed for channelization. It is anticipated <br />that in order to obtain the required aggregate for the <br />concrete in the dam, the contractor will have to process <br />approximately 310,000 cubic yards of material. The waste <br />material from that operation will be disposed of in the <br />reservoir area. Because of the limited area at the bottom <br />of the canyon for aggregate stockpiles, it is anticipated <br />that the processing operation will be carried on between <br />June and September during the last two years of the con- <br />struction period. <br /> <br />The next major construction item will be that of excava- <br />tion for the dam foundation and stripping of the abutments. <br />All waste material generated in this operation again will <br />be disposed of upstream of the dam in the reservoir area. <br /> <br />Another major item of work in the prime contract will be <br />channel excavation. The reasons for stream channelizing <br />are to create sufficient power head to maximize power <br />production at Crystal Powerplant as well as obtain concrete <br />aggregate for the dam. Approximately 8,000 feet of <br />channelizing below Crystal Dam, ranging in depths up to <br />24 feet, will be required. It is anticipated that some <br />280,000 cubic yards of material will be excavated--all of <br />which will be processed for aggregate, with rejected mate- <br />rial being wasted upstream of the dam in the reservoir <br />area. <br /> <br />c. Transmission lines.--The requirement for electrical <br />power to construct the Crystal Dam is of significance as <br />well as the permanent connection between Crystal and the <br />Project's transmission system. It is anticipated that a <br />separate contract will be awarded for construction of a <br />transmission line out of the canyon to the existing <br />transmission line which connects to the Curecanti Sub- <br />station. Approximately 10 miles of wood-pole transmission <br /> <br />8 <br />