CATEGORICAL EXCLUSION DETERMINATION - City of Green River Wastewater Treatment Plant Replacement Facility Construction

Wyoming Department of Environmental Quality  | view as a webpage

Wyoming Department of Environmental Quality

CATEGORICAL EXCLUSION DETERMINATION

For the City of Green River Wastewater Treatment Plant Replacement Facility Construction,
Sweetwater County, Wyoming

The Department of Environmental Quality/Water Quality Division (DEQ) has conducted a review of the proposed City of Green River Wastewater Treatment Plant Replacement Facility Construction 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 project includes the construction of a new activated sludge wastewater treatment facility to replace the City’s existing lagoon system, originally constructed in 1962. The work will involve the construction of a new headworks facility, oxidation ditch, clarifiers, sludge digester, and UV disinfection system. A new laboratory and administration building will also be constructed. The new facility will be located adjacent to the existing wastewater treatment plant at 220 East Teton Boulevard in Green River. The majority of the existing WWTP infrastructure will be removed and the property eventually reclaimed. Completion of the new construction is expected around the end of 2022.

The City of Green River 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 Green River plans to borrow $27.6 million from the Wyoming Clean Water State Revolving Loan Fund. The City had previously borrowed $2.4 million from the same source for the design of the new facility, resulting in a total loan amount of $30 million. The loans have terms of 2.5% and 30 years. Increased user fees will repay the loan. Monthly wastewater rates will be increased on an annual basis until typical monthly rates are in excess of $50, depending on customer water usage.

The City of Green River 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 the project will replace existing infrastructure on property adjacent to the existing facility. This project will be completely constructed in previously disturbed ground, specifically ground disturbed by development as an overflow parking area for the nearby rodeo grounds. 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 Green River, Sweetwater County, Wyoming.

The documentation to support this decision will be on file in the DEQ Cheyenne 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 W. 17th St. Suite 200, Cheyenne, WY 82002, Tel. (307) 777-6371, FAX (307) 635-1784, email: stanley.miller@wyo.gov.

Publish Date: November 20, 2019