Reconstruction of CR 29, 22H and CR31D (PN 9319, 9325 & 9436)
Questions and Answer Details for B15-22
Project Manager: Matt Johnson
Project Construction Manager: Gabe Routzahn
It is the responsibility of the bidder to verify all information within this document. If bidders
use the information in preparing a proposal, it is used at their own risk. Bidders are responsible
for all conclusion, deductions, and inference drawn from such information.
Source of Question: Pre-Bid Meeting, 10/7/2015
Question 1: Testing of battered micropiles for CR22H wall is problematic. Can testing occur for
only the vertical micropile?
Response: Yes, testing can occur on only the vertical micropiles. Revision of Section 503 Micropile has been revised accordingly.
Question 2: Clarify the gradation requirements for the Structural Backfill (Class 2) material as
specified on page 45.
Response: Revision of Section 206 – Excavation and Backfill for Structures has been revised to
remove any reference to ABC Class 4 or Class 5 materials.
Question 3: Please clarify rock anchor spacing?
Response: Rock anchor spacing is called out on Sheet 54 of the plan set, in the design table.
Question 4: Bearing Plates/nuts don't have corrosion protection called for in plans - is
galvanized ok?
Response: Yes, galvanized protection is ok.
Question 5: Please confirm grout strength requirements and pay length of the micropiles.
Response: Grout shall have a 28-day minimum compressive strength of 4000 psi. Pay length
will be defined as the total length, cased plus uncased. Plan sheet 57 has been revised.
Question 6: Please confirm micropile casing sizing. The 6" x1/4" casing doesn’t provide the
necessary wall thickness for the threads.
Response: Plan sheet 57 has been revised to include a 7” diameter x 0.408 inch Steel Casing.
Question 7: Was the micropile analyzed for the uncased segment?
Response: Yes.
Question 8: Will the County provide color image files for the rock scaling photos? It’s difficult to
identify the fracture locations?
Page 1 of 2
Larimer County PN 9319, 9325 & 9436, Bid No. 15-22
Reconstruction of CR 29, CR 22H and CR 31D
Reconstruction of CR 29, 22H and CR31D (PN 9319, 9325 & 9436)
Questions and Answer Details for B15-22
Project Manager: Matt Johnson
Project Construction Manager: Gabe Routzahn
Response: The plan documents include color images of the rock scaled locations. The
Contractors are encouraged to visit the sites prior to bidding, but no additional rock scaling
info/photos/diagrams will be provided.
Question 9: How is the rock scaling pay item measured? Is it per hour for all crewman,
equipment, etc.
Response: Yes. Refer to Revision of Section 203 Rock Scaling in the special provisions.
Question 10: Will the County allow cable lashing for rock scaling mitigation?
Response: No.
Question 11: Is blasting for rock excavation for wall spread footings allowed?
Response: No.
Question 12: Are they any weight restrictions on the CR 31D Bridge?
Response: No; however, any overweight or oversize vehicles shall be submitted to the
Engineer 1-week prior to construction for review.
Question 13: Is pre-drilling required for the installation of the Type 3 roadway approach
guardrail?
Response: Yes, please refer to the notes on Sheet 8.
Page 2 of 2
Larimer County PN 9319, 9325 & 9436, Bid No. 15-22
Reconstruction of CR 29, CR 22H and CR 31D