PROJ00455

• Contract/PO #: C153583
• Contractor Name: Ute Water Conservancy District
• Water District: 0
• Bill Number: XB 99-999
• Loan Projects - Doc Type: Feasibility Study

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the construction due to pennitting considerations present a problem. It is therefore
recommended that the pipeline be routed around the rest area and continue south
on the west side of the grove of mature cottonwoods. There appears to be a service
road west of SH 65 which presents an ideal relocation alignment for the pipeline.
The pipeline could be extended south to a point clearing the cottonwood trees. The
pipeline could then continue north to a point at which it would proceed east, down
the slope, and under SH 65.

2) On the north side of the Colorado River, the alignment of the pipeline should be
directly adjacent to the railroad R.O.W. The realignment of the pipeline in this
manner may reduce construction difficulties due to the presence of more competent
subsurface material, as well as address some potential environmental considerations.

Based on the Hydraulic Grade Line (HGL) developed by WEI, the pipeline along this portion of
the project is subjected to high water pressures. The static pressure for this section of the pipe is
estimated to be on the order of 210 psi. The dynamic (waterhammer) pressure is estimated to be
on the order of 260 psi. Oue to these relatively high pressures, large pipe size and adverse
subsurface conditions, the following design considerations have been identified for the subject
pipeline:

I) PIPELINE MATERIAL: the existing pipeline was constructed of reinforced concrete
pipe (SP-23) manufactured by Lock Joint Pipe Company. The alternatives for new
pipe material include pretensioned concrete pipe, high density polyethylene (HOPE)
pipe, and steel pipe. The new pipeline should be constructed of steel pipe for the
following reasons:

a) The problems encountered with the maintenance of the existing concrete
pipe;
b) The limited availability of new pretensioned concrete pipe;
c) The increased construction costs associated with installation of concrete pipe;
d) The high cost associated with HOPE pipe production; and
e) The lack of available 42" and 36" HOPE pipeline of sufficient wall thickness
for the appropriate pressure rating.

2) PIPELINE JOINTS and BENDS: The joints and bends along this section of the
pipeline are most prone to failure. The steel pipe construction will predominately
require bell and spigot type construction. The segments of pipeline placed under 1-
70 and the Colorado River should be welded. The valves should be secured using

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