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0 <br />Relevant Features to <br />CRRP <br />0 Steep terrain — 40% <br />• Deep excavations <br />• Highway Crossigs <br />Allen Mccol%ch Pipeline <br />Parallel Reaches S2 and <br />Municipal Water District of Orange County <br />Post Office Box 20895 <br />Fountain Valley, CA 92728 <br />Karl Seckel, P.E. (714) 963 -3058 <br />Project Description <br />Continued growth in the project area strained the existing water delivery pipeline -- <br />the 26 -mile Allen McColloch Pipeline, previously designed by Boyle -- to its limit. <br />The new pipeline parallel, planned when the original was constructed, will increase <br />the flow capacity and deliver water for 1.6 million people in the southern part of the <br />county. <br />The new reaches of the pipeline, designated S2 and S3, consist of tie -ins to existing <br />85 -inch welded steel pipeline at the northern end and 78 -inch prestressed concrete <br />cylinder pipeline at the southern end. Single branching wyes connect the new <br />parallel, constructed of 18,000 feet of 66 -inch diameter steel pipe with dielectric <br />coating. Three major valve vaults were constructed for two 66 -inch and one 54 -inch <br />butterfly valves. <br />Minimizing the down time for the existing pipeline was a major design constraint. <br />Round - the -clock construction accomplished all the tie -in work in seven days. <br />The pipeline route included steep hills with up to 40 percent slope and earth covers <br />up to 19 feet. Construction crossed an avocado orchard; over 2,000 trees were <br />removed and later replanted, timed to allow maximum harvest and optimum <br />replanting. Other areas along the route were graded and hydroseeded to minimize <br />erosion and to restore the right -of -way to its original condition. <br />i3OVLE <br />S3 <br />