Categorical Exclusion for the Sheridan Airport Mains Project

Wyoming Department of Environmental Quality  | view as a webpage

Wyoming Department of Environmental Quality

Public Notice: Categorical Exclusion for the Sheridan Airport Mains Project

For the City of Sheridan - 16-inch Airport Transmission Main Project
Sheridan County, Wyoming

The Department of Environmental Quality/Water Quality Division (DEQ) has conducted a review of the proposed City of Sheridan’s (City) 16-inch Airport Transmission Main Project (Project) in accordance with Environmental Protection Agency (EPA) and State of Wyoming (State) procedures for implementing the State Environment Review Process. DEQ has determined that the Project is eligible for a categorical exclusion. Accordingly, DEQ is exempting the Project from further substantive environmental review requirements under the State Environmental Review Process. Neither an Environmental Assessment/Finding of No Significant Impact nor an Environmental Impact Statement/Record of Decision will be required for the proposed action.

The following is a brief description of the situation and the proposed action, and a brief statement of how the action meets the criteria for a categorical exclusion.

Project Purpose and Need: The Project involves replacing an existing line that has failed in the past, is approaching the end of its life, and is in critical need of replacement. This water supply line connects an existing water supply line in the eastern end of the Big Goose Valley to major service areas at the airport, areas to the south including the State Girl’s School, the entire Little Goose Valley, the Big Horn Area, Sheridan College, and southeastern Sheridan.

Description of Proposed Improvements: The Project principally includes approximately 7,400 linear feet of 24-inch PVC water main, 3,900 linear feet of 20-inch water main, 6,100 linear feet of 16-inch water main, metering upgrades and SCADA, replacing approximately 800 linear feet of 8-inch DIP lateral to the airport, a new PRV station on the 8-- inch lateral, a PRV Bypass, and all other appurtenances associated with this project.

Project Financing: The Project’s estimated cost is $4,632,100. Funding for the Project is planned to come from the Wyoming Water Development Commission (WWDC), Sheridan Area Water Supply (SAWS), and the State’s Drinking Water State Revolving Fund program as follows:

● 67% of the estimated project cost ($3,102,000) will come from a grant from the WWDC which was previously approved by the 2019 Wyoming State Legislature.
● 17% of the estimated project cost ($765,000) will come from a 2.5% rate, 20-year loan with 25% Principal Forgiveness from the DWSRF. The anticipated annual payment for this loan is $47,400.
● 17% of the estimated project cost ($765,000.00) will come from funding provided by the Sheridan Area Water Supply (SAWS).

The City intends to pay back the principal of its 2.5% rate loan with Water Enterprise Funds. The Project is included in the City’s Capital Improvement Plans for water and sewer facilities, and has thus been addressed for funding as part of the City’s user rate structure.

The City is aware of and accepts the fact that it will be responsible for any required mitigative actions associated with and including stormwater runoff, erosion control, archeological/historic artifacts, and air quality concerns. These will be part of the standard State Revolving Funds Program contract conditions.

DEQ is granting a categorical exclusion because the Project rehabilitates existing infrastructure and will be completely constructed entirely inside existing structures, or on previously disturbed ground. DEQ has determined that exempting the proposed Project from further review under the State Environmental Review Process will not result in adverse impacts to the population, or areas within the City or within Sheridan County.

The documentation to support this decision will be on file in the DEQ Casper Field Office and is available for public scrutiny upon request. Comments concerning this decision may be addressed to Stanley Miller, SRF Project Engineer, DEQ, 200 West 17th St, Suite 200, Cheyenne, WY 82002, telephone (307) 777-6371, email

Publish Dates: July 31, 2020, Para español, visite