B09 Amendment 3 Yellowstone Canyon Project Report 0003.pdf
Posted: Sept. 2, 2026
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Summary
This **Chapter 3 Permit to Construct Design Report**, prepared by Stantec Consulting Services, Inc. for the National Park Service and Wyoming Department of Environmental Quality, addresses the proposed potable-water, fire-suppression, and sanitary-sewer improvements supporting 10 modular employee-housing units in Yellowstone National Park’s Canyon Government Area in Park County, Wyoming.
Dated June 19, 2026, the report covers development along portions of Badger Road and Wolf Road and is intended to provide the information required under Chapters 11 and 12 of the Wyoming Water Quality Rules and Regulations. Construction is anticipated to begin in fall 2026.
The project proposes approximately 1,460 linear feet of new 8-inch AWWA C900 DR18 PVC water main, ten individual 2-inch HDPE water and fire-service connections, valves, one new fire hydrant, and an air-release valve.
The water system will be a dead-end extension connected near existing maintenance facilities approximately 650 feet south of the modular units and will be owned and maintained by Yellowstone National Park.
Hydraulic modeling used average daily demand of 2,500 gallons per day, maximum daily demand of 6,800 gallons per day, peak-hour demand of 18.9 gallons per minute, automatic fire-suppression demand of 55 gallons per minute, and a 1,000-gallon-per-minute, one-hour site fire flow.
Modeling indicates peak-hour pressures of approximately 55.38 to 81.72 psi, fire-suppression residual pressures of at least 55.14 psi at the suppression location and 58.05 psi elsewhere, and 32.36 psi available residual pressure at the modeled hydrant during the 1,000-gpm fire-flow scenario. These results exceed the Chapter 12 minimum 20-psi requirement.
Sanitary improvements include approximately 1,030 linear feet of new 8-inch SDR26 PVC sewer main tied to the existing system, six new 48-inch manholes, and ten 4-inch SDR26 PVC sanitary-sewer services.
Proposed sewer slopes range from approximately 0.60 to 3.70 feet per 100 feet, with service lines designed at a minimum slope of 2.00 feet per 100 feet.
The project adds no water-storage, pumping, or treatment facilities and does not modify the existing treatment plant. The report states that the existing Canyon water system and wastewater treatment facilities have adequate capacity for the proposed demands.
Supporting materials include permit drawings, specifications, potable-water hydraulic analyses, sewer-capacity calculations, and a treatment-plant basis-of-design report.
Dated June 19, 2026, the report covers development along portions of Badger Road and Wolf Road and is intended to provide the information required under Chapters 11 and 12 of the Wyoming Water Quality Rules and Regulations. Construction is anticipated to begin in fall 2026.
The project proposes approximately 1,460 linear feet of new 8-inch AWWA C900 DR18 PVC water main, ten individual 2-inch HDPE water and fire-service connections, valves, one new fire hydrant, and an air-release valve.
The water system will be a dead-end extension connected near existing maintenance facilities approximately 650 feet south of the modular units and will be owned and maintained by Yellowstone National Park.
Hydraulic modeling used average daily demand of 2,500 gallons per day, maximum daily demand of 6,800 gallons per day, peak-hour demand of 18.9 gallons per minute, automatic fire-suppression demand of 55 gallons per minute, and a 1,000-gallon-per-minute, one-hour site fire flow.
Modeling indicates peak-hour pressures of approximately 55.38 to 81.72 psi, fire-suppression residual pressures of at least 55.14 psi at the suppression location and 58.05 psi elsewhere, and 32.36 psi available residual pressure at the modeled hydrant during the 1,000-gpm fire-flow scenario. These results exceed the Chapter 12 minimum 20-psi requirement.
Sanitary improvements include approximately 1,030 linear feet of new 8-inch SDR26 PVC sewer main tied to the existing system, six new 48-inch manholes, and ten 4-inch SDR26 PVC sanitary-sewer services.
Proposed sewer slopes range from approximately 0.60 to 3.70 feet per 100 feet, with service lines designed at a minimum slope of 2.00 feet per 100 feet.
The project adds no water-storage, pumping, or treatment facilities and does not modify the existing treatment plant. The report states that the existing Canyon water system and wastewater treatment facilities have adequate capacity for the proposed demands.
Supporting materials include permit drawings, specifications, potable-water hydraulic analyses, sewer-capacity calculations, and a treatment-plant basis-of-design report.
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