Q A_Elk_Lake_Road_(11-17-2016).pdf

Project No. MT Beaverhead 237(1)

Project Elk Lake Road

# General Technical Question Answer Date

1 X

There are no backwalls for the ends of the bridge shown on the drawing, can you please indicate what type of walls the contractor will need to provide? Please include material type, galvanized steel, precast concrete etc. and dimensions in your reply.

The back wall design/material is at the

Contractor’s option.

2 X

The specifications section 555.03 A (c) (1) require the guardrail to meet TL‐2 requirements but the drawings on sheet P.05 note 3 show a TL‐1 rail system. Please clarify.

See Amendment A001, that corrects the SCR

555.03 A (c) (1) to reflect the TL-1

requirement.

3 X

Are the offset blocks shown between the guardrail posts and guardrail in the illustrative drawing on sheet P.05 a requirement? They are not mentioned in the specifications or drawing notes.

Typical railings are shown on P.05, contractor may submit an alternate rail as part of their bridge design, the railing must meet TL‐1.

4 X

The precast sill beams shown on drawing P.04 will weigh in excess of 56,000 lbs, can they be supplied in multiple pieces per sill or do they need to be one piece?

Multiple pieces are acceptable, provided the connections are designed and submitted for approval.

5 X Is there a place to waste sub‐excavated material on site?

No on‐site location has been identified for waste material.

6 X

Where does the bridge being removed from

Red Rock Creek need to be delivered? Will the county be providing the equipment to unload the bridge at this site?

See SCR 203.04

7 X

Does Elk Springs Creek need to be diverted to remove the existing culverts or can they be removed in live water?

Cofferdams are included in the estimate of quantities and it is anticipated that they will be used to reduce sediment. The contractor will need to comply with all requirements in the SCRs and FP‐14 and the permits

(especially MTDEQ 318 Short Term Water

Quality Standard for Construction Activity and

401 Water Quality Certification), including the following relevant to this question:

FP‐14 107.10(a), SCR 107.10(d)(14), FP‐14

157.10, and FP‐14 208.05

8 X Where can construction dewatering be discharged? Will it be necessary to discharge the water into a silt bag?

Construction dewatering water can be discharged in an upland area at least 50 feet away from wetlands or streams per SCR

107.10(d)(13). It is not necessary to discharge water into a silt bag.

11/8/2016

Check General or Technical

10/28/16

9 X What if the sheet piling can't be installed to the desired depth in the plans?

This issue would be handled during construction.

10 X

How deep from the top of the piling does native ground need to be excavated to, to allow for the installation of the concrete seal and the granular backfill?

Per Section P of the plans, 2 ft of select granular backfill or concrete seal is required under the concrete sill beams at each bridge.

11 X Will the utility be relocated prior to the start of the project (existing bridge removal)?

See SCR 107.02. The utility will not be relocated prior to start of the project. It is up to the contractor to coordinate with the utility company.

12 X

Will the utility need to go across the new bridge?

The utility is not planned to go across the new bridge, though the bridge is currently designed with the conduit. The Contractor will need to coordinate with the utility company (See SCR 107.02) and submit preliminary plans (See SCR 155.08)

13 X

Is the plan to use the existing bridge at Red

Rock Creek for a detour bridge while constructing the proposed new bridge at station 115+98 to 116+58? If so it appears the installation of the cofferdams and the excavation for the foundations will be conflicting with the existing structure and unable to maintain proper detour lane width.

See Amendment A002. 11/11/2016

14 X

There appears to be no design or specs for the cofferdams. Are we supposed to design and submit for the sheetpile thickness? And do the cofferdams remain after project completion?

The sheet piling cofferdam design are specified on each of the foundation layout sheet with Note 2. The cofferdams are permanent.

11/16/2016

11/9/2016