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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2.2.3 Previous Studies

In order to evaluate possible alternatives for providing an adequate and reliable water transmission
system, the District retained WEI to conduct a feasibility study of the Plateau Creek pipeline. The
results of WEI study were presented in an October 1987 report titled, "Feasibility Study Plateau
Creek Pipeline".

The WEI report presented six alternatives to provide raw water to the District's treatment plant.
The recommended alternative was to augment the existing 24-inch pipeline with a larger parallel
pipeline. This larger pipeline could be constructed in phases as need arose and cross-connected to
the existing pipeline to form an integrated water delivery system.

WEI's alternative considers construction of the upgrade pipeline in three phases. The first phase
would consist of approximately 8,620 feet of 42-inch diameter and 13,200 feet of 36-inch diameter
pipeline. The larger pipeline would be constructed in Plateau Canyon and along the Colorado River
to bypass the tunnel. The smaller pipeline would be constructed in the Plateau Creek area along
the Highway 65. Sections of Plateau Creek are to be armored to protect the 24-inch diameter
pipeline and minimize the potential for pipeline breaks during flooding. The second and third
phases will each add approximately 15,625 feet of36-inch diameter pipe and the necessary armoring
for sections of Plateau Creek.

2.2.4 Rationale for Feasibility Study Amendment

Following review and evaluation of WEI's report, it was determined that the recommended
alternative route for the pipeline presented special regulatory and engineering considerations which
would require additional evaluation prior to the final route selection. In October 1990, the District
retained SRK to conduct additional studies and further evaluate the feasibility and requirements
for construction of the pipeline in the vicinity of the confluence of Plateau Creek and the Colorado
River. After studying the problems associated with the old raw water delivery system and reviewing
the work performed by WEI, SRK in collaboration with BLI determined that an alternate delivery
system may be feasible for this section. This alternative consists of a new tunnel to be constructed
parallel and adjacent to the existing Plateau Creek raw water supply tunnel.

2.3 Scope of Work

The scope of work for this feasibility study amendment was to perform a detailed evaluation of the
technical, permitting and financial considerations for the pipeline bypass alternative versus the
SRKIBLI tunnel alternative. The scope of work was limited only to the portion of the phase I

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