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Show THE ALL-AMERICAN CANAL, 37 tion to operate successfully. This board believes that it would be unwise to permit any experimentation which does not at the outset give almost certain promise of success, and it has, therefore, adopted unit costs based on methods of work which experience has standardized and which will give assurance of successful accomplishment within a time limit that can be predicted with some certainty, It is known that practically all of the work can be done with such standard equipment as drag-line excavators and steam shovels and that such work, under payment for electric energy or the generation of power at the drops or with oil as fuel, should be done at a cost of about 20 to 30 cents per cubic yard when no powder is required to loosen the material, and 75 cents per cubic yard for rock. Wherever the conditions are such that the excavated material must be transported for a considerable distance lengthwise, steam shovels are well adapted for the work. They will load upon cars, and trackage will have to be provided to send the excavated material to selected dumps or to some place where its deposit will be of some use. For the rock cuts at and adjacent to Laguna Dam, steam shovels with the addition of a clamshell or orange-peel excavator and a hydraulic dredge for the excavation of the desilting basin are contemplated. The material from the rock cuts will be hauled for use in the training jetty of the settling basin and to riprap the levee, which affords protection to the upper end of the main canal. Some of this material may be placed in the reservation levee of the Yuma project, but the haulage costs for this work would not be charged to the all-American canal. For the enlargement of the 10 miles of the Yuma project main canal to siphon drop large size drag-line excavators are contemplated. These will handle all the material with the exception of a few short stretches where the main canal hugs the base of the mesa bluffs. In these stretches a medium-sized steam shovel will be used. From siphon drop to Araz practically all the work is suited for drag-line excavators, and from Araz to Pilot Knob for steam shovels. At Pilot Knob, too, practically all the excavation will be made with steam shovels. Space for spoil along the line of the canal, which will be but a few hundred feet from the international boundary, is limited. The excavated material must nearly all be transported for a considerable distance lengthwise of the canal. It is proposed to have the steam-shovel track system connected with the track on the "River" levee and to extend this track the full length of the Saiz levee and also to put a track on the Ockerson levee, connecting with this line and extending to the head of the Bee River. It will thereby be made possible, at the cost of some extra haul, which is small, to send the material from the canal to the "River," Saiz, |
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Original book: [State of Arizona, complainant v. State of California, Palo Verde Irrigation District, Coachella Valley County Water District, Metropolitan Water District of Southern California, City of Los Angeles, California, City of San Diego, California, and County of San Diego, California, defendants, United States of America, State of Nevada, State of New Mexico, State of Utah, interveners] : California exhibits. |