Addendum to Bidder Inquire Atchison CSO Construction.pdf
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- Solicitation number
- W912DQ27BA002
About this file
This document is an Addendum to Bidder Inquiry for the Atchison CSO Construction project dated 09 November 2026. It provides clarifications and answers to five technical questions submitted by bidders regarding project specifications and installation requirements.
The addendum addresses material and installation specifications for the project, including requirements for Reinforced Concrete Pipe (RCP) with industry-standard testing certifications referenced in Appendix A Section 2600; site restoration using seed and/or sod at the contractor's discretion to restore areas to original or better condition; concrete headwall installation in accordance with USACE Solicitation Specification and City of Atchison Public Works (APWA) specifications rather than MODOT specifications; restrained joint installation on RCP outfall pipe in the last three joints to prevent pipe separation due to steep slope, required in combination with the headwall; and trench backfill under paved surfaces using flowable fill or aggregate backfill (such as AB-3 or pipe bedding) if sufficient clearance exists, with specified compaction requirements and testing mandated for aggregate backfill. The document does not contain bidding deadlines, award dates, pricing terms, or set-aside information, serving instead as technical guidance for bidders preparing proposals.
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Addendum to Bidder Inquire Atchison CSO Construction
09 November 2026
Question 1: We have had issues finding RCP manufacturers that will provide the testing requirements in the specifications. Would you have any contact information for manufacturers that provided budget for this project?
Answer 1: RCP Testing certification in the specification are industry standard.
See Appendix A Section 2600.
Question 2: If sod is required, can they explain where they want it or is it just seeding.
Answer 2: Seed and Sod is used to "Restore areas used during the performance of the Contract to the original or better condition". Contractor to determine if seed and/or sod is needed to restore areas to the original condition.
Question 3: The concrete headwall detail is a MODOT Standard plan sheet. Are we to install this in accordance with MODOT Specifications?
Answer 3: Installation in accordance with USACE Solicitation Specification. Specification included Appendix A - CITY OF ATCHISON PUBLIC WORKS SPECIFICATIONS. Appendix A comprises of APWA specifications.
Question 4: Detail on sheet C-508 / B2 shows restrained joints being installed on the last 3 joints of the RCP Run. I typically see this when the last joint is connected to an end section or not connected to anything. Are they requiring restrained when the RCP run is being terminated into a storm inlet or Headwall?
Answer 4: Restrained joints are being installed on the RCP outfall pipe due to the steep slope to prevent future separation of pipe segments. These will be required in combination with the headwall.
Question 5: Detail for trench installation under a paved surface on sheet C-509 shows Flowable fill backfill for utility trenches under a paved surface. The APWA Detain on sheet 21-22 of the APWA portion shows that granular bedding or flowable fill can be used for the trench backfill. Is granular bedding acceptable for the utility trench backfill under paced surfaces or does it have to be flowable fill.
If granular bedding can be used is AB-3 or pipe bedding acceptable for the backfill?
Answer 5: All trenches under pavement are likely to narrow or otherwise obstructed to ensure proper compaction of aggregate backfill. If enough clearance exists for aggregate backfill then it can be used and will require specified compaction requirements and testing.
File details come from the government source that posted it. Updated .