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I I I I I I I I I I I I I I I I I I I alignment profiles were examined to determine the different head classes that would apply. Table 3.10 presents a summary of the sizes, class, and length for the pipe types evaluated. This table also illustrates how the lengths change for various pipe types, priMarily due to differences in the inside di ameter. As note1 previ ously, a common fri cti on factor was used for all pipes. A composite cost for the various sizes, class an1 length was compute.1 for each alternative alignment, 1esign discharqe and alignment. This sinqle unit cost per foot was then included in the estimate times the total oioeline 1 ength. Install ati on costs were estimated for the different trenchi ng, backfil 1 i nq, and handl i ng costs associ ated wi th the vari ous pi pe types. Fiqure 3. 9 sho\~s the typical sections of the pipe installations with the earthwork and backfi 11 i ng requi rements. Fi gure 3.10 shows the areas where rock and wet excavation conditions are estimated to occur. The tlielve cost estimates are summarized in Table 3.11 and more detaile1 breakdowns are shown on the four summary sheets at the end of this section. ------------------------------------------------------------------------------- ------------------------------------------------------------------------------- Tab1 e 3.11 Summary of Alternative Pipeline Estimated Costs Alignment A A1ignm'!nt B Q = 2.5 Ducti 1 e Iron Pretensioned Cylinder Concrete PVC/Permastran $3,229,000 3,36~,000 :l,159,000 $:l,44tl,OOO :l,"i71,000 3,468,000 Q = 3.0 Ductile Iron Pretensioned Cylinder Concrete PVC/Permastran $3,443,000 3,473,000 3,286,000 $3,685,000 3,689,000 3,617,000 =============================================================================== 3-4:l l060c