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<br />CHAPTER V <br /> <br />PLAN OF DEVELOPMENT <br /> <br />A. Physical Plan - The Lake Loveland outlet tunnel is the <br />primary structure that is capable of draining Lake Loveland com- <br />pletely. The 60 inch outlet tunnel supplies water to the Greeley <br />and Loveland Irrigation Company, as well as the Seven Lakes <br />Reservoir Company systems, The outlet tunnel was originally con- <br />structed in 1909 and consists primarily of brick and mortar. <br />Over the years the Lake Loveland outlet tunnel has deteriorated <br />and is in need of repair. The proposed rehabilitation of the <br />Lake Loveland outlet tunnel consists of relining the tunnel with <br />steel pipe, gunite, or polyethylene pipe. The steel pipe method <br />will consist of relining the existing outlet tunnel with steel <br />pipe. The steel pipe will be a 48" diameter pipe liner with the <br />void between the liner and existing outlet properly grouted, The <br />wall thickness of the steel pipe is one-half inch and the pipe <br />will be lined with Tremic Epoxy Polyamide. <br /> <br />The gunite method will consist of applying shotcrete to the <br />existing outlet tunnel. The gunite method will conform to the <br />requirements of "Specifications for Materials", Porportioning, <br />and Application of Shotcrete (ACl-506.2)", published by the <br />American Concrete Institute. <br /> <br />The polyethylene pipe method will consist of relining the <br />existing outlet tunnel with a polyethylene pipe, The polyethylene <br />pipe will be a 48" diameter pipe liner with the voids between the <br />liner and the existing outlet tunnel properly grouted. The liner <br />will be High Density Polyethylene Pipe (HDPE), Class 63, ASTM D1248. <br /> <br />In evaluating the three alternatives, the following analysis <br />was performed: <br /> <br />Alternative <br /> <br />Advantage <br /> <br />Disadvantage <br /> <br />1. Steel Pipe <br /> <br />1. Durable with a <br />long life. <br /> <br />1. Highest Cost <br />2. Difficult <br />construction <br /> <br />2, Gunite <br /> <br />1, Lowest cost. <br /> <br />1. Shorter life. <br />2. Possible future <br />maintenance <br />problems. <br /> <br />3, <br /> <br />Polyethylene Pipe <br /> <br />1. Durable with a 1. <br />long life. <br />2. Construction easier <br />than steel pipe. <br />3. Lower cost than steel <br /> <br />Higher cost <br />than gunite. <br /> <br />6 <br />