CATEGORICAL EXCLUSION DETERMINATION - Town of Thermopolis, 2017 – Thermopolis Pipeline Replacement Project

Wyoming Department of Environmental Quality  | view as a webpage

Wyoming Department of Environmental Quality


For the Town of Thermopolis, 2017 – Thermopolis Pipeline Replacement Project,

Hot Springs County, Wyoming

The Department of Environmental Quality/Water Quality Division (DEQ) has conducted a review of the proposed 2017 – Thermopolis Pipeline Replacement 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.

This project will replace approximately 11,500 ft. of existing drinking water transmission lines. The lines to be replaced include the lines along 5th and 7th St. between Shoshoni and Broadway, Warren St. between 4th and 5th St., 4th St. between Warren and Broadway, and the two transmission lines running from the water treatment plant west to 8th St. and north under the Big Horn river along 6th St. Also to be replaced in this project are the transmission lines from Broadway St. through E. Park St. to the State Park Water Tank, and the section of transmission line along Valley View Dr. between the water pump station and S.14th St. The total cost of this project will be $2,845,200.00. Funding for the project will come from Wyoming Water Development Commission (WWDC) and the Drinking Water State Revolving Loan Fund (DWSRF) administered by the Wyoming Office of State Lands and Investments. The town will be borrowing $1,300,000.00 from the DWSRF. Half of the overall principal amount ($650,000.00) will be subject to a 2.5% interest rate for a 20 year term and the remaining 50% ($650,000.00) will qualify for loan forgiveness. WWDC will be providing a $1,545,200.00 grant for the remaining cost of the project. The loan through DWSRF will be paid for using water revenues and/or the depreciation reserve. User rates and fees will not be affected by this construction project.

The Town of Thermopolis, Wyoming 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. Other than documenting the location of asbestos cement pipe and areas where asbestos cement pipe is replaced with pipe bursting, no noteworthy environmental issues, impacts, or mitigation have been identified regarding this project.

DEQ is granting an exclusion because the project will be replacing existing infrastructure in ground that has been previously disturbed by the installation of the existing waterlines. 

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 the Town of Thermopolis and Hot Springs County, Wyoming.

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 Brian Mark, PE, SRF Principal Engineer, DEQ Water Quality Division, 200 W. 17th St. 2nd Floor, Cheyenne, WY 82002, telephone (307) 777-6371, FAX (307) 635-1784, email

Publish Date: April 20, 2017