Q&A_Boulder(4).pdf

MT Sweetgrass 210(1)

Main Boulder River Road Improvements

# General Technical Question Answer Date

1 x Miller Creek Bridge drawing RG3067‐H sheet

M.30 middle‐bottom of sheet has VERTICAL

WATERSTOP DETAILS (Typical at all corners).

Because the box beams set directly on the pile cap there is no space below the beam to install this detail at the corners. Please advise.

The detail does not attach to the precast concrete beams. The vertical waterstop is installed at the vertical joint between the cast in place (CIP) backwall and the wingwall:

11/16/16

2 x

Section 203 Removal of Structures and

Obstructions: lead based paint ids present on nearly all surfaces of the existing 2‐Mile Bridge.

Montana DEQ has no policy regarding LBP in this instance. Sletten intends to legally dispose of the existing bridge off site. Does WFL have any

LBP requirements other than what is listed in this section?

Follow Section 203 11/29/16

3 x

Is an alternate section allowed? For instance, Forterra in Billings, MT produces a BTEE, but shorter than that called out in the plans. Can we use this shorter bulb tee as long as it meets the design requirements?

We don’t allow alternate sections as this could have an adverse effect on other components of the bridge, i.e. bearings, abutment seat elevation, abutment width, railing. If an alternate section is desired, this would be considered a value engineering change, and therefore all revisions to the bridge (include backup calculations) would need to be submitted according to Section

103.03. The alternate sectionng for Two

Mile bridge is shallower than what the contract plans call for, therefore, they would need to also submit all changes to the bridge including those to the abutment seat elevation and/or the bearing height. 11/29/16

4 x

Bid item 15708‐1400 does not differentiate between the two types of fiber rolls.

Either type will be acceptable. When 100% biodegradable excelsior is not available, use other 100% biodegradable product. 12/7/16

5 x

Sheet M.30 “Vertical Waterstop Details” – detail calls for a 1/8” Butyl Rubber Sheet – is it acceptable to substitute Neoprene Rubber Sheet for the Butyl? According to my supplier Butyl

Rubber is prone to cracking in this application.

As an aside, the Montana Department of

Transportation specifies Neoprene Rubber.

This is acceptable.

12/7/2016

6 x

Sheet M.30 Miller Creek Post box beam ‐ post‐ tensioning. Please confirm that grouting of the tendons after they are tensioned is not required

Correct, grouting of the post tensioning voids after tensioning the rods, is not required.

12/12/2016

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