Addendum to Bidder Inquire Atchison CSO Construction

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.