Ahtna Global (Ahtna) self-performed all project oversight, carpentry work, demolition work, and surveying for this sidewalk upgrade. The goal of the project was to replace the sidewalk with one that is ADA-compliant. The work included demolishing wooden stairs, part of a boardwalk, a concrete sidewalk, and part of an asphalt parking lot to build a concrete sidewalk and ramp in compliance with ADA. To achieve the desired slope of the concrete ramp, the concrete stairs had to be shifted outside the perimeter of the ramp as to provide adequate head clearance.

Complexities

After arriving on site, it was discovered that many details in the project plans about the existing conditions were not accurate. Ahtna had to develop a plan in the field to achieve the drainage pathways detailed in the plans with differing elevations and still conform to ADA requirements.

The plans detailed Douglas Fur for much of the carpentry work, while the existing boardwalk and guardrail wood was cedar. Due to the site being a historical landmark, it was required that we match existing construction. Achieving this took a great deal of coordination with local NPS officials and historical landmark experts.

During concrete construction, the weather was frequently below freezing overnight. This required measures to be taken to prevent frost damage in the concrete during concrete. Also, there was frequent rain, so Ahtna was required to assist its concrete subcontractor with building shelters to prevent the fresh concrete from becoming water damaged.

Logistics

Bartlett Cove is in Glacier Bay National Park and Preserve which borders Gustavus. Gustavus, Alaska was only accessible via ferry semi-weekly and small aircraft semi-daily during construction. This required coordination to receive all large items via ferry in time for placement/installation, coordination with the expediter in Gustavus.

Categories: Construction