CATEGORICAL EXCLUSION DETERMINATION - City of Laramie, North Laramie Sanitary Sewer Trunk Main Project

Wyoming Department of Environmental Quality  | view as a webpage

Wyoming Department of Environmental Quality


For the City of Laramie, North Laramie Sanitary Sewer Trunk Main Project, Albany County, Wyoming.

The Department of Environmental Quality/Water Quality Division (DEQ) has conducted a review of the proposed North Laramie Sanitary Sewer Trunk Main Project in accordance with EPA and State of Wyoming procedures for implementing the State Environmental Review Process. DEQ has determined that this 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.

The North Laramie Sanitary Sewer Trunk Main project includes the design and construction of a sanitary sewer main that runs from the City’s main lift station on the east side of the Laramie River, easterly to the intersection of 30th Street and Asphalt Lane. The project includes approximately 13,000 lineal feet of sanitary sewer mains of various sizes (12” to 36” diameter) along the northern extent of the community. The system will ultimately serve to provide a sewer service to the northern portions of town addressing future demands and existing deficiencies.

The proposed sewer main will provide service to future development along the northern portion of the community, including Cirrus Sky, as well as relieve portions of the existing system that are at capacity.

The City of Laramie intends to use funds from the Wyoming Clean Water State Revolving Loan Fund administered by the Wyoming Office of State Lands and Investments. Based on current estimates, the City of Laramie plans to borrow $2,500,000 from the Wyoming Clean Water State Revolving Loan Fund. Current user fees will repay the loan and do not require an increase in rates at this time. Loan terms will be 2.5% over 30 years.

The City of Laramie is aware of and accepts the fact that they will be responsible for any required mitigative actions associated with and including storm water 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 an exclusion because this project utilizes already existing infrastructure adjacent to the Laramie River and is otherwise being constructed in previously disturbed ground, specifically ground disturbed by the installation of water mains, sewer mains, streets, and grazing operations. 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 the area of Laramie, Albany County, Wyoming.

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

Publish Date: December 22, 2018