PROJ00455

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

I
I
I
I
'I
I
I
I
I
I
I
I
I
I
I
I
I
I
I

drilling with a jack-leg air drill, blasting, mucking into muck cars and then placing any necessary
temporary support. It is anticipated that excavation will proceed through good, dry ground and that
no major problems will be encountered. The existing roads to the east and west portals would be
upgraded to allow for material deliveries.

5.6 Maintenance Considerations

No extraordinary maintenance requirements are anticipated with either tunnel Alignment A or B.
Both will require maintaining a section of pipeline up the steep slope leading to the East Portal.
However, it is our understanding that the existing 24 inch diameter pipeline has had no major
problems. As stated earlier, it is anticipated that the pipeline would be anchored to the rock in this
area to prevent catastrophic failure. Additionally, it is anticipated that the existing roads which will
be upgraded during construction will require regular grading and maintenance to maintain their
condition.

There will be differing maintenance conditions for each of the three typical cross-sections described
above. The configuration as shown in typical cross-section SA, will require periodically coating of
exposed pipe surfaces to prevent corrosion. This painting will probably have to be performed during
the summer time and allowances for ventilation and lighting in the tunnel during painting operations
will be required. Additionally, the District must maintain the portal such that air flow through the
tunnel is not permitted during winter in order to prevent pipe freezing. Alternative 5B will require
little to no maintenance. The only maintenance that is anticipated will be periodic inspections. It
is anticipated that these inspections will be yearly the first two or three years and then progress to
a five year inspection schedule. During inspections allowances for ventilation will be necessary.

Typical section 5C will require little to no maintenance other than periodic inspections. However,
should repairs be required, this alternative would probably be the most costly and require the most
time to affect repairs. Repairs would require shutting down the complete pipeline, digging up a
section of the pipeline and repairing it by hand.

5.7 Cost Estimate and Schedule

Tables 5.1 and 5.2 present cost comparisons for the three alternative tunnel and pipe configurations.
Refer to figure 5.4 for illustration of the three alternatives.

Costs presented in tables 5.1 and 5.2 include costs for the pipeline inside the tunnel and connections
to the existing pipeline. Expansions proposed by Western Engineers have been included. The
limits of costs included are from Junction Box TI to the connection with the existing 24 inch

18