PROJ00223

• Contract/PO #: C153723
• Contractor Name: Orchard Mesa Irrigation District
• Contract Type: Loan
• Water District: 0
• County: Mesa
• Bill Number: HB 95-1155
• Loan Projects - Doc Type: Feasibility Study

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bid for PVC pipe, concrete pipe and polyethylene pipe. For purposes of
this analysis, PVC pipe will be used as the basis for cost comparison.
Three different pipeline sizes are to be used in Phase 1: 30 inch, 27 inch
and 24 inch. A flow control gate and trash removal structure is located at
the inlet to the pipeline at the junction with Canal No.1. At station
94+ 15, the discharge pipe from the Colorado River pump station on 29
Road will connect to the Mutual Mesa pipeline; a meter box structure is
located at that point. A 20 inch flow meter will be placed on the pump
discharge pipe in the valve box. Air vents will be provided on the main
line pipe.

The mainline pipe will flow under pressure and all diversions to water users
will be done through a tap or tee on the pipe. For larger water users, a
concrete structure with a weir plate will be installed on the diversion pipe.
For smaller water users, the diversion pipe will consist of a riser and
valve. Larger diversions will use butterfly valves; smaller diversions will
use globe valves and angle valves.

The estimated cost for Alternl\te A-I is shown in Table V-A.

Alternative A-2 (Concrete LimoJl Ditch) Under this alternative, the Mutual
Mesa ditch will be replaced with a reinforced concrete ditch system. Three
different cross sections will be constructed to match the capacity of the 3
different pipeline sizes. A new flow control gate will be placed at the
connection to Orchard Mesa Canal No.1. The trash removal facility will
not be needed, since the system will be an open ditch. The 20 inch meter
will be installed at the pump discharge line in a separate meter box.

Concrete transition structures will be placed at locations where the open
ditch connects to pipelines or culverts. This would occur at road and ditch
crossings.

Standard headgates will be used at all turn-outs in lieu of the valves and
overflow structures used with the pipeline. No air vents will be needed.

The estimated cost for Alternate A-2 is shown in Table V-B.

5.

Annual Cost

a. Amortization Costs. Amortized costs are equivalent to the annual
payment made to payoff a debt. There are three sources of funds for
the project 1) the CWCB loan, 2) the NRCS grant, and 3) the aMID
contribution. Although only one is actually a loan, the amortized cost
provides a true equivalent cost of each investment on an annual basis.
The terms applied to each contribution are as follows:

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