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<br />I <br />I <br /> <br />a new outlet works is considered for the reconstruction project <br />with an alterante of repairing the existing outlet. <br /> <br />I <br /> <br />SITE GEOLOGY <br /> <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />Reservoir No. 15 1S located adjacent to the foothills of the <br />Rocky Mountains. The Reservoir lies at the junction of two dis- <br />tinct geologic formations. The Eastern portion of the reservoir <br />approaches the Pierre Shale formation. The Western portion of <br />the reservoir is in the Niobrara group, including Apishapa shales <br />and Timpas limestone. The limestone formation is visible at the <br />Western edge of the reservoir. <br /> <br />Por this feasibility, we contracted with Chen and Associates, Inc. <br />to provide additional geologic and geotechnical investigations of <br />this site. Their report, in complete context, is included in <br />Appendix "D" of this report. <br /> <br />I <br />I <br />I <br /> <br />For the 1975 Report, soils investigations Ivere conducted <br />by Empire Laboratories of Fort Collins, Colorado. Their Soils <br />report is included in the "Preliminary Report of Rehabiliation of <br />The North Poudre Irrigation Company Reservoir No. 15 Dam", dated <br />December, 1975. <br /> <br />DESIGN <br /> <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />The design criteria used to establish the proposed improvements to <br />this reservoir was taken from the following reference: <br />1. Design of small dams, Bureau of Reclamation <br />2. Colorado State Engineer's Office <br />3. Generally accepted practices in the profession <br /> <br />The normal high waterline of the reserV01r was established at 42.2 <br />feet as measured from the highest point in the invert of the outlet <br />works to restore the high waterline to the original decreed depth. <br /> <br />11 <br />