Public Notice: Clean Water Act Certification for the Canyon Wastewater Treatment Plant Project in Yellowstone National Park

The proposed project is to rehabilitate and replace components of the Canyon Village Wastewater Treatment Plant (WWTP) and upgrade segments of the collection system to improve wastewater treatment and collection. The project includes construction at six sites as described below.

Work completed below the ordinary highwater mark for the following three sites include:

• Demolition of existing buildings and lagoons at the Canyon Village WWTP and construction of new buildings and ponds within the existing fence limits. The Headworks Building will extend slightly beyond the existing fence to maintain operation during construction. Construction will result in permanent (0.069 acres) and temporary (0.079 acres) wetland impacts.
• Construction at the influent gravity sewer alignment to Canyon Village WWTP includes removal of existing 2,100 feet of 10 inch sewer pipe and replacement with a 12 inch sewer pipe using an open cut method along the existing alignment. Construction will result on 0.007 acres of temporary wetland impacts from excavation and 68 cubic yards of backfill.
• Construction at the Government Area gravity sewer alignment to Government Lift Station includes removal of 1,785 feet of 6 inch gravity sewer pipe that will be replaced with 8 inch gravity sewer pipe using an open cut method along the existing alignment. Construction will result in temporary wetland impacts from excavation and 77 cubic yards of backfill.

Upland work completed for the project includes demolition of the existing lift station building at the Government Area lift station and construction of a new building and overflow tank for the lift station pumps and valves. Work completed at the Government Area force main alignment includes abandoning the existing pumped pipeline from the lift station and constructing a new force main using an open cut method along a new alignment to avoid impacts to a wetland and trees that have grown in along the existing alignment. The new alignment will primarily be along an existing road and will cross two roads using a horizontal direction drill method. The existing lift station building at the Brink of Upper Falls will be demolished and a new building and overflow tank will be constructed for the lift station pumps and valves. There are no wetland impacts at these three upland sites.

Public Comments

Submit comments as described in the “How to Comment” box at the righthand side of this webpage. The EPA must receive comments by 11:59 pm MST on January 17, 2025.

All comments received prior to the end of the comment period will be considered in the preparation of the Clean Water Action Section 401 Water Quality Certification and will be part of the administrative record. Contact Estella Moore ([email protected]; 303-312-6329) to request additional information, public notice updates, submit comments or provide additional information relevant to this certification.

Notice of any extension of the comment period will be published on this page and sent to those who have requested updates.

At this time there is no opportunity to review the submitted material and documents in person at an EPA office. These documents are only available electronically and can be provided upon request.

Public Hearings

Any person may request, in writing within the comment period specified in this notice, that a public hearing be held to consider this application. If the Administrator, in his or her discretion, determines that a public hearing is appropriate or necessary, the EPA will schedule a public hearing. You may request a public hearing using the information in the “How to Comment” box on the righthand side of this webpage.