W9128F26QA054 GP Drain Rehab - Questions and Answers Update 7-23-26.pdf
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- Attached to
- Gavins Point Powerhouse Drain Rehab
- Solicitation number
- W9128F26QA054
About this file
This is a Questions and Answers document for federal contract W9128F26QA054, the Gavins Point Powerhouse Drain Rehab project. The document addresses contractor inquiries regarding the scope, site conditions, and technical requirements for rehabilitating drain lines at the facility.
The project involves lining drain lines with Cured-in-Place Pipe (CIPP) technology on the B-Floor of the powerhouse. The drain lines contain room temperature fresh water, with occasional exposure to very diluted EarthTec QA molluscide (parts-per-billion concentration) and minimal use of Rydlyme descaler. No additional cleanouts or access points will be permitted, as piping is encased in concrete; contractors must work within existing access points shown on provided prints and complete all work using existing infrastructure. A known obstruction—a stuck cutting head from a sewer snake—exists in the piping and must be removed by the contractor at no additional cost, utilizing whatever means and methods necessary including vacuum extraction if required. All pipeline preparation, including removal of heavy tuberculation, scale, and debris to restore original pipe diameter, is the contractor's responsibility and must be priced within applicable Contract Line Items (CLINs). For the 6-inch line, ASTM F3240-17 compliant Seamless Molded Hydrophilic Gaskets are required at all terminal ends; for 3-inch and 4-inch lines, contractors may use approved hydrophilic paste, caulking, or alternative end-seal methods to ensure watertight seals. Service connection reinstatement through robotic means is considered standard CIPP lining work and requires no separate line item. Site visits can be arranged by contacting eric.e.johnson@usace.army.mil or Michael.y.nuss@usace.army.mil, with detailed piping section views and above-ground photographs provided in supplementary attachments.
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Text version
W9128F26QA054
Gavins Point Powerhouse Drain Rehab
Questions & Answers
7/23/26 Q: Are there any chemicals or high temperatures going into these lines?
A: There are no high temps that go through the drain lines. Everything is usually room temperature or colder. For chemicals, these lines may occasionally see a very diluted amount, parts-per-billion, of EarthTec QA molluscide.There are no chemicals that are used to a great extent on the lines on B-Floor. In the past, we have used Rydlyme descaler on occasion, but that use has diminished greatly since the zebra mussels have been under control and the drains have been repaired, and will likely not be used at all after the completion of this contract. The usual flow through the lines is room temperature fresh water.
6/14/26
Q: Would it be possible to do a site visit to review the project location and layout of the work area?
A: If you would like to arrange an appointment to view the site, please contact eric.e.johnson@usace.army.mil or Michael.y.nuss@usace.army.mil.
Q: Are there any existing videos and/or inspection reports for each line?
A: We have the tradesmen’s working knowledge, but no saved videos or reports.
Q: What are the existing access points? What are the diameters of those access points?
A: Access points are noted on the prints that are posted with the solicitation. Diameters of the access points should be close to the same size as the pipe being accessed.
Q: Will the owner allow the installation of additional clean-outs or access points to facilitate the heavy cleaning needed, the liner installations and access for the robotic cutter for reinstating any branch connections?
A: No additional cleanouts will be allowed. Piping is encased in concrete and extensive work would be needed to add clean outs. Drains on other floors were completed in the same manner without additional clean outs.
Q: If so, will the owner add a line item to cover this work?
A: No additional line items will be added.
Q: Will the owner allow “Minimally Invasive Clean-Outs” to be installed for access. One hundred percent compliant with ASTM F3097-22.
A: No additional cleanouts will be allowed.
Q: What are the depths of the lines?
A: Refer to piping section views shown in Attachment A.
Q: Can you provide above ground photos of the project area?
A: View photo attachment PDF uploaded with this Q&A document.
Q: Will the owner add a line item to cover the unknown time/materials needed to remove the jet head that is stuck in the pipe?
A: It is a cutting head to a sewer snake. No separate line item will be added for the removal of the existing stuck cutting head. This obstruction is a known site condition. The contractor must factor the removal of known pipeline obstructions into their mobilization, cleaning, and preparation pricing.
Q: If the jet head cannot be removed through trenchless methods, will the owner add a line item to provide a small vacuum excavation to retrieve the jet nozzle?
A: No pre-emptive line item will be added. As stated in the previous response, this is a known obstruction. The contractor is responsible for utilizing whatever means and methods are necessary (including vacuum extraction, if required) to clear the line and fulfill the contract scope. Additional compensation will not be provided for alternative methods used to remove a known obstruction.
Q: Is it the intent to line the trunk lines only or does the owner want to line/seal each connection as well? If so, what means or methods are to be used for the connection portion of the pipe?
A: The drain line segments subject to lining, including requirements for connections, are clearly shown in Attachment A. The specific means and methods used to execute the connection portions are the responsibility of the contractor, subject to the material and performance requirements outlined in the contract specifications and Government submittal approval.
Q: Would the owner consider adding a line item for the heavy tuberculation removal either by the hour or by the foot. This will eliminate the need for a contractor to artificially inflate the cost due to unknown time/labor that will be needed to complete.
A: No. Pipeline preparation, including the removal of heavy tuberculation, scale, and debris to restore the pipe to its original inner diameter prior to lining, is the sole responsibility of the contractor. This must be priced in under applicable CLIN items.
Q: Will the owner add a line item for each service reinstatement to be completed through robotic means?
A: Reinstatement of active service connections is a standard component of CIPP lining. No separate line item will be added.
Q: Does the owner require Seamless Molded Hydrophilic Gaskets at each end of every liner? ASTM F3240-17 compliant.
A: For the 6-inch line, the contractor shall install ASTM F3240-17 compliant Seamless Molded Hydrophilic Gaskets at all terminal ends.
For the 3-inch and 4-inch lines, due to diameter constraints, the contractor may utilize an approved ASTM F3240-compliant hydrophilic paste, caulking, or alternative end-seal method to ensure a watertight seal without restricting the pipe’s hydraulic capacity.
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