CT2017-1402 Approval Letter

• Contract/PO #: CT2017-1402
• Contractor Name: North Poudre Irrigation Company
• Contract Type: Loan
• Loan Projects - Doc Type: Approval Letter

North Poudre Irrigation Company Agenda Item 13b
July 20-21, 2016 Board Meeting(Updated July 22, 2016)
Page 3 of 5
Average annual diversions of the entire Company are 44,400 acre-feet.
Project Description
The purpose of the Project is to repair damage to the Livermore tunnel system, resulting from partial
collapse of the tunnels in multiple reaches, thus restoring overall delivery capacity, which has been
impacted by the accumulation of rock fall and debris. Repairs will be made to six collapse zones, and,
proactively, to an additional ten shear/void areas.
The Feasibility study evaluated several alternatives for this project:
Alternative 1 - No Action: This alternative was considered unacceptable. Left alone, the tunnel would
be vulnerable to future collapses of unknown extent that could result in service interruptions and
emergency repairs with uncontrollable costs.
Selected Alternative 2 - Repair collapse zones and repair shear/void areas: The proposed project
generally includes repairing six collapse zones with rock scaling and excavation to remove existing
damage and rock fall, installation of a concrete liner plate base, installation of overhead and side liner
plates, and filling of the voids remaining between the new liner plates and the existing tunnel wall/roof
with foam and concrete backfill. Ten shear/void areas will be repaired using shotcrete, mesh, and rock
bolting. The estimated cost of the project is $1,597,000 including construction, contingency, and
engineering support.
Alternative 3 - Repair collapse zones only: The Company also analyzed saving cost by repairing only
the six collapse zones described in Alternative 2 above. The ten shear/void areas would not be repaired
under this alternative. While, ultimately, these shear zones will need rehabilitation, they are stable in
the short term. Leaving these repairs out of the Project would save approximately $120,500 in
construction, contingency and engineering support costs, resulting in an estimated total project cost of
$1,476,400. This option was not selected, since future costs to repair these areas as a separate project
would be much higher than the short-term amount saved.
TABLE 1: ESTIMATED PROJECT COSTS
Task Cost
Design and Permitting � $140,000
Construction $1,457,000
Total $1,597,000
Permitting: The Company has full access to the project area under existing easements. No
permits or additional easements are required to complete the project.
Schedule: Preliminary drawings and cost estimates have been prepared. A final design will be developed
in concert with a contractor selected through a bid and qualifications process. Construction is planned
for fall 2016 when the diversion can be closed and the tunnel drained, with completion targeted prior to
the spring 2017 irrigation season.