Q&A_Version_2.docx

Chips Creek Trail Bridge (129AC718R0002) Questions and Answers Document

Subsequent versions of this document will contain questions from all previous versions.

Version 1: 07/24//2018

Q1 - I had some pictures from the project site sent to me from someone who attended the site visit. From the looks of the pictures it appears the bridge location is mainly on bedrock. So my question is, would we be required to blast the bedrock to required bottom elevations of foundations or could we adjust foundations with bridge engineer to have a more cost effective foundation all the while keeping the same bridge design?

A1 – Recommend that the bidders bid the plans that we have prepared for the project. The contract language stipulates that the bridge site is to be located by a licensed land surveyor and that blasting “may be required” to install the abutments. Once the actual location of the bridge is established and the site specific conditions can be observed by all, then there may be a need to make appropriate adjustments to the geometry of the footings by the Structural Engineer due to a difference in the site conditions stated in the plans.

Q2 - I have some confusion, due to thinking too much or not enough, about the specs. For the base course and surface course rock. Could a single grade of rock like a washed pea rock (3/8 inch washed of fines) meet the specs? If not what about a 3/4 minus rock (less than 5% passing #200 sieve) for both the base and surface course?

A2 – The aggregate base and surface courses for the trail are clearly shown on the drawings. Please see sheet 16 of 20 of the project plans wherein the Base Couse is shown to be a Pit run material 1.5” minus with less than 5% passing No. 200 Sieve and the Surface course material is shown to be a Pit run material ¾” minus with less than 5% passing No. 200 Sieve. It is recommended to bid what is shown on the drawings.