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' <br />I� <br />�� <br />' <br />� <br />' <br />' <br />�I <br />1 <br />' <br />�I <br />NEED FOR THE PROJECT <br />The Wood Lake Mutual Water & Irrigation Company is undertaking this project to meet the <br />requirements of the State Engineer's Office for dam safety and to continue to provide irrigation water <br />to its shareholders to irrigate their crops. <br />The Angel Lake and Dam and associated structures were constructed in the early 1900's. The dam <br />is approximately 2,000 feet in length, has approximately 3 to 1 to 5 to 1 upstream slopes and <br />approximately 1.5 to 1 downstream slope at the outlet with a crest width of 50 feet and a maximum <br />structural height of approximately 16 feet. The dam is located on the south and east sides of the <br />reservoir with the outlet located on the south side. A portion of the dam is also the highway <br />embankment for Weld County Road 74 and the outlet penetrates the roadway embankment. <br />The outlet conduit is an 18-inch diameter clay pipe that has reached its usable life span. The pipe <br />is cracked and leaking but does not appear to be structurally unstable at this time. The service <br />spillway conduit is and 18-inch clay pipe that is in very poor condition and does not appear to be <br />structurally sound. The pipe has been repaired in the past but appears to be failing at the joints. <br />Photographs 1, 2, 3, and 4 in Appendix A show photographs of the dam and outlet works. <br />The intent of the Company is to address the above deficiencies and rehabilitate the outlet such that <br />it meets current standards and requirements of the State Engineer. <br />ALTERNATIVESEVALUATED <br />A range of alternatives were considered including 1) Complete replacement of the outlet and service <br />' spillway, 2) repair of the outlet and spillway conduits by lining, and 3) no action to repair the outlet <br />conduits. <br />' Alternative 1- Replace the Exiting Outlet Works <br />Alternative 1 is for a complete replacement of the outlet works including the service spillway. The <br />' dam would be breached and the existing structures removed and replaced. The outlet conduit will <br />be replaced by a 30-inch diameter concrete or ductile iron pipe. A new concrete gate tower will be <br />' constructed and act as the control for the outlet and the service spillway. The outlet operator and <br />gate will be also replaced. Figure 3 shows the proposed details of the outlet works proposed. <br />' <br />�� <br />' <br />' <br />The estimated total project cost for this alternative is $ 234,000 as show in Table l. A complete <br />breakdown of the work proposed and expected costs are included in Table 1. <br />Alternative 2- Line the Existing Outlet Conduits <br />This alternative considered lining the outlet conduit and the spillway conduit with either an HDPE <br />Liner or using the Insitu Form process. Inspection of the outlet has indicated installing a pipe within <br />Angel Lake Feasibility Study Page 4 <br />' <br />