RFI.pdf

RFI

Specs Civil Solutions.

Question: I noticed a discrepancy between your plans and your specs with regard to the headwall heights on the arch culverts. The plans (sheet C9, Structure Note #1) note a headwall height 1’ over the crown of the arch. The specs (page 58) note a headwall height of 30” over the arch crown.

Can you please verify which dimension you need? Additionally, please confirm if the specs are to be followed to account for vehicular impact on the headwalls.

Answer: There is a discrepancy on sheet C-9 and in the specifications and between the specs and the drawings. The note indicates the headwall should be 12” above the arch crown and the note at the upper left corner drawing indicates the top of asphalt road is 12” above the crown of the culvert, but the headwall extends an additional 18” above this to incorporate an additional “curb”. This is indeed the desired final condition.

The total headwall height is to be 30” above the culvert crown with 12’’ to hold the fill and road surface and an additional 18” curb. This curb is intended to be designed for vehicular impact as it says in the specification.

Fletcher Construction

Question: Can we use another manufacturer for the precast bridge structure or is contech the only one.

Answer: Yes an equal product can be submitted, however the product must be truly equal and will be subject to review process.

Question: On the schedule of items sheet. on pay item 204.17c, 204.17d, 204.17e, 207.10, 208.13 it calls out on-site material conforming to codes 704.07,703.14, 704.04, 714.1, 704.04. They are not in any of the paperwork downloaded for the fbo web site is there another site I can go to and get those codes

Answer: Each of the material specifications can be found in the Standard Specifications for Construction of Roads and Bridges on Federal Highways Projects (FP-14). You can download this document at the following website in either word or PDF format.

http://flh.fhwa.dot.gov/resources/specs/