Q A_3-20.pdf

AK IRR Fort 1002(1)

Ivars Road Bridge

# General Technical Question Answer Date

2 x

Regarding the referenced project, will the FHWA accept welded wire reinforcements and facing in the integrated bridge system designed in accordance with FHWA‐HRT‐11‐026?

No, welded wired reinforcing and facing will not be acceptable for this structure

3 x

Plan Sheet F2: Section A-A indicates a propsed channel bottom elevation of 985, is the contractor required to re-grade the existing streambed in locations not affected by construction efforts or just limit to the extents of project placed materials (GBS- IBS Materials and Riprap)?

Only regrading of areas affected by construction activities is required, Sheet F.2 shows the proposed streambed elevation that is required when removing the pipe culverts as part of the contract work. The

985 ft elevation is an approximate thalweg elevation at the crossing.

3/10/2016

4 x

Can you please provide flow or velocity data for the Sucker River near the proposed/existing bridge location?

Additional flow velocity is not available: the

Sucker River is mainly influenced by backwatering of the Yukon River and is fairly slow moving through most of the year.

3/10/2016

5 x

Can bridge manufactures propose an alternate deck design to the timber laminated deck if we comply with all other design and Live Load criteria?

Please bid the project as designed with the timber deck (Value Engineering proposals can be proposed after award in accordance with FP‐14 Section 103.

3/16/2016

6 x

The type of "Roadway Aggregate" called out on the plans seems somewhat vague. Please specify type or gradation to adhere to.

Please refer to FP‐14 standard specification, sections 302 and 703.

3/17/2016

7 x

OHW = 991.0'* callout on Sheet G.1 of Project Plans has an asterisk with "Navigational Opening: 7'-0" Min.". How is this OWH level to be interpreted with the 7'- 0" Min Navigational Opening?

the Minimum Navigation Opening is the difference between the OHW elevation and

Lower Cords Elevation.

3/17/2016

3/2/2016

Check General or Technical

1 X Can we propose an alternative bridge design using a steel truss bridge?

This is a site specific design and all design options had been considered, so no alternatives will be allowed.

10/12/2015