DENA HQ Utility Infrastructure Upgrade EA

The National Park Service (NPS) is proposing to upgrade the utility systems in the headquarters area of Denali National Park and Preserve. The purpose of the project is to provide reliable utility service for the headquarters facilities, protect the health and safety of park staff in performing operations and maintenance, increase the utility infrastructure energy efficiency, and reduce the park's energy consumption and operating costs.

The existing utilidor system consists of underground concrete and corrugated metal pipe structures that connect the administrative facilities and permanent housing units in the headquarters area. The utilidor houses multiple utilities, including steam, water, sewer, electrical, and communication (i.e., power, telephone, data, fire alarm, and satellite) lines. The steam, sewer, and water lines have not been replaced since the utilidor's construction in 1958, and are well past their serviceable life.

The Environmental Assessment evaluates the environmental and operational impacts of two alternatives, the no action alternative and the NPS preferred alternative to upgrade the utility systems and complete the transition from steam to propane heating. Under the no action alternative the park would continue to maintain the existing utility infrastructure. The preferred alternative includes the placement of new water, sewer, propane, and electric/communication lines in buried trenches located mostly under the headquarters road system, the installation of new propane tanks near some of the buildings, and the abandonment of the current utilidor.

Document Content:

DENA Headquarters Utility Infrastructure Upgrade EA   (2.7 MB, PDF file) Disclaimer: Links within the above document(s) were valid as of the date published. Note: Some of the files may be in PDF format and can be viewed using the Adobe Acrobat Reader software. You may download a free copy of from Adobe Systems.