C153514 Feasibility Study

• Contract/PO #: C153514
• Contractor Name: Farmers Water Development Company
• Contract Type: Loan
• Water District: 60
• County: San Miguel
• Bill Number: SB 87-15
• Loan Projects - Doc Type: Feasibility Study

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A detailed description of the emergency repair program can be found in
the Steffen Robertson and Kirsten (Colorado) Inc. (SRK) reports of March
and May 19B7 titled "Emergency Repair Program Design Report, Gurley
Reservoir" and "Emergency Repair Program As-Built Report, Gurley
Reservoir", respectively.

The proposed remedial design for the Phase 2 remediation program
has been developed to complement the emergency repair (Phase 1) program
completed during April 1987 and includes:

1. Rehabilitation of the outlet works tunnel by inserting and
grouting a steel liner section inside the existing concrete
tunnel structure;

2; Construction of a replacement intake structure for the
existing intake control box at the upstream end of the outlet
works;

3. Installation of a new, hydraulically actuated sluice gate on
the new intake structure with new hydraulic lines and a new
hand operated control system mounted in the existing gate
house;

4. Installation of a new air vent system to address the surging
and hammering noted during operation of the existing outlet
conduit and to minimize associat~d cavitation damage; and

5. Completion of a foundation grout curtain in the vicinity of
the outlet works to reduce foundation seepage in the area
which historically has been prone to sinkhole development.

The following sections of this report summarize available field data and
laboratory test results and present engineering assessments which were
used to develop the proposed remedial design concept.

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