(2)_Two_Simplified_Construction_Schedules_3.pdf
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- Solicitation number
- DOIRFBO240024
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This document contains two simplified construction schedules for the Heart Butte Dam Safety of Dams Modification project. The schedules outline the proposed sequence and timing of key construction activities, including jet grouting, filter installation, conduit repairs, and reservoir drawdown, under both a 2-year and 3-year construction timeline.
The schedules were prepared by the Bureau of Reclamation to supplement the Questions for Contractors document released for the Heart Butte Dam Industry Day event. The two timelines present the benefits and drawbacks of each approach, with the 2-year schedule potentially requiring only one reservoir drawdown, but posing increased congestion and schedule risk, while the 3-year schedule spreads out the work over a longer period but necessitates two drawdowns. The Bureau is evaluating the appropriate construction approach based on these factors.
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Two (2) Simplified Construction Schedules
On October 3, 2024, the Buerau of Reclamation posted Questions for Contractors at Heart Butte Dam Industry Day document uploaded to SAM.gov. Reclamation prepared the following two simplified construction schedules to supplement the Question 1 and 2 of that document.
The reservoir will be drawn down as much as possible prior to starting work within the outlet works conduit, as the outlet works is the only way to evacuate water from the reservoir. If the work can be constructed in two construction seasons instead of three, Reclamation might be able to avoid a second drawdown of the reservoir in the middle of construction.
2 construction season discussion:
Benefits are that possibly only one reservoir drawdown to dead pool is needed.
Drawbacks:
o A considerable amount of congestion around the outlet works stilling basin is happening all at once, including jet grouting, dewatering, filter trench, filter work in the channel, and access for work inside the conduit. Reclamation is evaluating whether this induces too much construction schedule risk.
3 construction season discussion:
Benefits are that work is spread out over a longer period, resulting in less site congestion.
Drawbacks are that two reservoir drawdowns to dead pool are needed.
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10/8/2024
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TASK
Cell B8 con
2‐Year Schedule.
Award Oct. 2026
Mob and Site Preparation
Jet Grouting
Void Grouting Below Conduit
Filter Trench
Stilling Basin Filters
Filter Blanket Exavate
Joint Grouting Inside Conduit
Seeding and Cleanup row con
TASK
Cell B8 con
3‐Year Schedule.
Award Oct. 2026
Mob and Site Preparation
Jet Grouting
Void Grouting Below Conduit
Filter Trench
Stilling Basin Filters
Filter Blanket Exavate
Joint Grouting Inside Conduit
Seeding and Cleanup
Construction Complete. Normal Operations
Possible Outlet Works Flow
Jet Grout Outside Conduit & Dewatering Installation
Jet Grout Outside Conduit & Dewatering Installation
Backfill MSE Wall
Unwater and Install Filters
Install Dewatering
Site prep.
Bench install
No Outlet Works Flow No Outlet Works Flow
Jet Grout Interior work
Repair Conduit Interior
Reservoir Drawdown Possible Reservoir
Drawdown
Reservoir Drawdown No Outlet Works Flow Reservoir Drawdown No Outlet Works Flow
Install Dewatering
Site prep.
Bench install
Preparation with Grouting in Nov.
Install Filter Trench
Jet Grout Interior work
Repair Conduit Interior
Install Filter Trench
Preparation with Grouting in Nov.
Unwater and Install Filters
Backfill MSE Wall
| Two Simplified Construction Schedules |
| Heart Butte Dam 2-year and 3-year simplified construction schedules |
File details come from the government source that posted it. Updated .