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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />CONSULTING <br />~ ENGINEERS <br />~ ~~r~~~K-e-r~~~AN~NGINEERING COMPANY, INC. <br /> <br />MIDWEST DISTRICT OFFICE <br />1777 S, BElL.AIRE STREET I DENVER, COLORADO 80222 <br />PHONE. (303) 157-&>86 <br /> <br />September 11, 197B <br /> <br />Mr. Nick Ioannides <br />Supervisory Water Resources Engineer <br />Department of Natural Resources <br />State of Colorado <br />1313 Sherman St. <br />Denver, CO 80203 <br /> <br />Dear Mr. Ioannides: <br /> <br />This report is submitted in accordance with our contract dated August 15, <br />1978 to perform an engineering feasibility review of the proposed Yamcolo <br />project. The review includes three phases: geology, design, and construc.. <br />tion. The first two phases concentrate primarily upon abutment and shoreline <br />stability and related design requirements. The third deals with overall <br />construction considerations with a view to reducing costs and avoiding <br />delays. <br /> <br />It is the conclusion of our consultant geologist, Dr. Charles Robinson, <br />that there are no geologic problems at the Yamcolo site which cannot be <br />overcome by standard engineering procedure. With this in mind, several <br />relatively minor dam design modifications are recommended to provide <br />increased abutment stability. As for the reservoir shoreline, we concur <br />with Western Engineers that borrow excavation should be controlled in the <br />vicinity of Borrow Area A to insure the stability of the reservoir bank. <br />Specific recommendations are made for that area as well as for a limited <br />section of stream bank immediately downstream of the left abutment. <br /> <br />Documents reviewed in the preparation of this report include the following: <br /> <br />1. Contract Documents and Specifications for Construction of Yamcolo Dam, <br />Reservoir, and Relocation of Forest Service Access Road. August 1978. <br /> <br />2, Drawing Sheets Nos. 1-11, Less No.3, Preliminary Prints. <br /> <br />3. Yamcolo Damsite, Geological Exploration Report, November, 1977, <br /> <br />4. Yamcolo Reservoir, Geotechniy Data, 1977. <br /> <br />5. Yamcolo Reservoir, Spillway Foundation Investigation, 1969. <br /> <br />6. U.S. Bureau of Reclamation Letter dated November 27, 1968, with logs <br />of four test pits. <br /> <br />7. CO River Water Conservation District letter dated December 9, 1963, <br />with report by Jay A. Olson dated October 15, 1963. <br /> <br />~ <br />