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<br />. <br /> <br />.. <br /> <br />J}9db~ of the R.M.A.G. committee members that the railroads may <br /> <br />have made measurements where their roadbeds cross the evaporite <br /> <br />in adjacent areas and these could be checked. According to the <br /> <br />engineering department of the Denver and Rio Grande Railroad they <br /> <br />have a fairly large mileage of track laid on the evaporite along <br /> <br />the Eagle River valley north of Ruedi. Their measurements over <br /> <br />the years have shown no evidence of any significant movement of the <br /> <br />evaporite under their tracks or bridges or other structures. Also, <br /> <br />within the limited records of the U. S. G. S. Topographic Branch, <br /> <br />the writer could find no evidence of historic movement of the <br /> <br />evaporite. <br /> <br />It has been contended that there will be collapse of the <br /> <br />valley bottom and walls and dangerous landslides within the reser- <br /> <br />voir, assumedly in the gypsiferous rocks. To date, twenty-one <br /> <br />holes, totaling 8897 feet of drilling, have been drilled in the <br />+ <br />reservoir basin to depths of 300 to 600 feet and no void has been <br /> <br />located into which the surface could collapse. The development <br /> <br />of such large voids within the historic life of the project after <br /> <br />the reservoir has been filled would have to come by means of solu- <br /> <br />tion and this does not seem probable since the drill holes indicate <br /> <br />that the natural voids of the formation in the valley bottom are <br /> <br />essentially saturated now and the presence of reservoir water will <br /> <br />not do more than increase the head. <br /> <br />There is no question in the writer's mind that there will be <br /> <br />slumping along the margins of the reservoir when the formations <br /> <br />7 - <br />