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<br />I <br />I <br />, <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 />detected near the outlet works conduit during drilling operations in September <br />1985. <br /> <br />In February 1986, the City of Greeley applied to the Colorado Water <br />Conservation Board (CWCB) for partial funding of a feasibility study to <br />rehabll I tate Peterson lake Dam. That fundi ng was approved by the CWCB In <br />r~ay 1986. Morrl son-Knudsen Engl neers, !nc. (MKE) was se1 ected to perform the <br />feasibility study In June of 1986. <br /> <br />The study was initiated by reviewing available reference material on file at <br />the City of Greel ey and the SEO. Thl s i ncl uded the Phase I Inspect! on Report <br />of the National Dam Safety Program, sponsored by the U.S. Corps of Engineers; <br />various hydrological and geotechnical reports; and specifications and drawings <br />of previous rehabilitation work. A list of these references was compiled; <br /> <br />Background Information on the City of Greeley's history, laws, physical <br />assets, and present and future financial status \1aS gathered. The City's <br />water exchange plan with the North Poudre Irrigation Company for Colorado-Big <br />Thompson (CBT) water was researched. The City's water requirements were <br />assessed as a function of population projections and per capita use rates. <br />The water supply and project yield were determined using the Peterson lake <br />total storage right of 1,252 acre-feet. The firm annual yield for Peterson <br />lake Reservoir at the present restricted level Is 595 acre-feet, but due to <br />the City-imposed restriction Is effectively zero acre-feet. <br /> <br />If the dam were rehabilitated and the restriction removed, the firm annual <br />yield would Increase to 1,010 acre-feet. The sediment yield In the Peterson <br />lake Reservoir drainage basin was estimated at 26 acre-feet, for a 100-year <br />project life. Water quality of the Cache 1a Poudre River was analyzed and was <br />generally found to be excellent for domestic, municipal, Industrial, and <br />agricultural purposes. <br /> <br />Previous work had indicated that the spillway capacity at Peterson lake Dam <br />was sufficient to pass the probable maximum flood (PMF) , as required by the <br />SEO for high hazard dams. A hydrological analysis of the drainage basin was <br /> <br />ff <br />