To:
From:
Re:
D. Motion:
Discussion:
City of Nashua, Public Works Division
Board of Public Works Meeting Date: July 28, 2022
Daniel Hudson, P.E., City Engineer
Engineering Department
2022 Sewer Rehabilitation — Siphon Rehabilitation Construction
To approve the construction contract for Siphon Rehabilitation with Insituform
Technologies LLC of Chesterfield, MO in an amount of $1,173,000. Funding will
be through Department: 169 Wastewater; Fund: Bond; Activity: Sewer
Infrastructure Improvements.
During Phase 1 of the Capacity, Management, Operation and Maintenance
(CMOM) program, eight locations where inverted sewer siphons convey
wastewater from one side of a waterway to the other side were cleaned and
inspected using closed circuit television (CCTV). Fourteen of the 22 siphon
sections, ranging in size from 8 inches to 36 inches, were identified with
deficiencies that include cracks, erosion of cement lining, corrosion, holes, and
exposed rebar. Rehabilitation of these pipes will be completed using cured-in-place
pipe lining (CIPP) methods. Strategies to temporarily redirect wastewater flow
through different barrels are required to make the repairs. Access to these sites with
lining equipment will be a challenge and will likely require tree and vegetation
removal.
This project was advertised for bid on June 14, 2022. A mandatory prebid meeting
was held on June 23, 2022 and three contractors attended. On July 14, 2022, the
following bids were received:
Insituform Technologies LLC of Chesterfield, MO $1,173,000.00
National Water Main Cleaning Co. of Boston, MA $1,337,750.00
Insituform Technologies at a bid price of $1,173,000.00 is the qualified low bidder.
Their references have been checked by engineering consultant Hazen.
