Burns & McDonnell is providing planning, design and construction-phase engineering services to the City of Gillette for the pipeline project. The city is experiencing aggressive population growth because of burgeoning energy development in the Powder River Basin and across Wyoming. An increase in water demand has resulted from this population growth, especially during peak periods that are taxing Gillette's existing water supplies. The city also realized that the existing water supply conduit from their long-term water source did not provide the redundancy and reliability of service required of critical infrastructure.
In order to improve system delivery and meet the city's long-term water needs, the team is designing the new Madison Formation Well Field, 52 miles of 36- and 42-inch-diameter pipeline, a 23.5 million-gallon-per-day pump station, a 1 million-gallon welded steel water storage tank, an on-site sodium hypochlorite disinfection generation facility, three miles of 18-inch-diameter blending water line, and a water blending facility to improve distribution system water quality.
- Alignment evaluation and selection
- Pipeline material evaluation
- Easement and land acquisition
- Pipeline materials evaluation
- Grading, erosion, sediment control plan and SWPPP permitting
- Hydraulic analysis and surge study
- On-site sodium hypochlorite generation
- Resident project observation
- Construction management
Complete hydraulic modeling, including surge analysis, was performed for the entire water system (including new and existing transmission pipelines) to determine the future demand and storage requirements for the new tank, confirm all proposed transmission and future distribution pipe sizes, determine all system pressures and flows, and project water quality.
The 52-mile pipeline crosses of Interstate (I-90) three times. It also has two railroad crossings, dozens of creek and waterway crossings, and frequent crossings of state and county roads. Coordination with the Wyoming Department of Transportation, Campbell County, Crook County, the Army Corps of Engineers, the Bureau of Land Management, and Burlington Northern Santa Fe Railroad was required for permitting and crossing agreements.
Environmental studies were required to identify wetlands and other environmentally sensitive areas. Multiple bores are required for crossing under critical infrastructure or environmentally sensitive areas with minimal disturbance. The project team developed easement exhibits and legal descriptions. More than 100 license agreements, land acquisitions, temporary and permanent easements are required for this project.
The Burns & McDonnell team and the City of Gillette continue to coordinate with the Wyoming Water Development Commission to help secure regional support and funding for this project. Pipeline material and cathodic protection workshops were held with pipe manufacturers and cathodic protection specialists to determine the allowable pipeline material and cathodic protection because of the project's magnitude and importance. Burns & McDonnell will continue to support the City of Gillette through the multiple work phases and contracts to complete a successful regional project.