QnA 9.23.2020.pdf
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- Attached to
- CO FLAP US50(1) Little Blue Creek Canyon
- Solicitation number
- 6982AF20B000008
About this file
This document contains questions and answers from a presolicitation for the CO FLAP US50(1) Little Blue Creek Canyon federal contract opportunity. The project involves reconstructing 4.17 miles of roadway to widen the travel way and shoulders, add 1.5 miles of climbing lanes, conduct large scale rock excavation and embankment work, install retaining walls and drainage culverts, and perform paving, guardrail installation, and bridge work. Notable quantities include 180,000 cubic yards of roadway excavation, 38,500 cubic yards of waste, 580 cubic yards of grouted riprap stream armoring, 60,000 square feet of mechanically stabilized earth walls, 2,500 linear feet of rock bolts, and 70,000 tons of aggregate base. The questions and answers provide clarification but no electronic design files will be provided, mumble strips must be bid as specified, and excavation for stream armoring is considered incidental work. The contractor must coordinate obtaining construction water from the Blue River.
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Text version
Questions and Answers during Advertisement for
CO FLAP US50(1) Little Blue Creek Canyon
September 17, 2020
Questions Answers
1 Are there electronic CAD files for the project that can be made available to contractors? Having the electronic files increases the efficiency and accuracy of our earthwork take-offs.
No, electronic CAD files will not be provided.
2 The Ditch Armoring at STA. 614+25 – 614+80 LT is not shown on the cross sections. Will cross sections be provided showing the
Ditch Armoring at STA 614+25 – 614+80 LT.? If yes, please provide.
Armoring is not shown in sections. Armoring to be field fitted to meet the existing slope, and fit within the criteria shown on the sheet. Cross Sections showing the armoring will not be provided.
3 The Bank Stabilization at STA 615+80 to 616+10 LT is not shown on the cross sections. Will cross sections be provided showing the bank stabilization at STA 615+80 to 616+10 LT? If yes, please provide.
Stabilization is not shown in sections. Armoring to be field fitted to meet the existing slope, and fit within the criteria shown on the sheet. Cross
Sections showing the armoring not to be provided.
4 Will the FHWA consider changing the Mumble strips (sinusoidal) specification to a standard CDOT rumble strip detail?
No, bid the project using mumble strips.
5 To install the Riprap per the cross sections and typical section(s) on sheets G2-G3, excavation and backfill will be required. Please confirm the excavated quantities will be paid under 20401-0000
Roadway Excavation.
Excavation required to place the stream armoring is incidental to the pay item. Excavation material generated is shown under Available Material in the grading summary.
Refer to the SCR’s and the FP-14 for work considered incidental.
Excavation for these quantities is not measured for payment and not paid for under the 20401-000, Roadway Excavation Item.
September 23, 2020
Questions Answers
6 Will bids be accepted for alternate pipe materials for the culverts/drainage? I would propose corrugated HDPE pipe which meets CDOT requirements.
No, but a value engineering proposal may be considered after contract award.
7 Does FHWA require the assistance of a blasting consultant for approval of contractor submittals? Not at this time.
8 The geotechnical report references two reports that were done by YA and Associates.
Will the FHWA provide these reports? The Geotechnical report indicates that the YA reports should be referenced while reading the Geotechnical Reports. The actual bore logs are needed to evaluate the temporary shoring for the retaining walls and to design the support of excavation required for the
Rockery Walls and the GRS walls. In Table 2 “Summary of the YA Borings
Performed within the current CO US50(1) Alignment” no elevations are given , which requires inaccurate scaling from cross-sections to determine the rock elevation for the 12 bores that were taken for the retaining wall. In addition, It’s necessary to make a determination of the quality of the in-situ material above the rock to assess the predicted “hang time” of the excavation to design the support of excavation required.
These reports will be uploaded with the solicitation.
9 Has the FHWA obtained the required approvals for the successful contractor to obtain construction water by pumping water from the Blue River
FHWA has not obtained water rights. The successful contractor will need to coordinate this on their behalf.
File details come from the government source that posted it. Updated .