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  5. ›2024 Water Treatment Plant Fi​lter 18/20 Underdrain…

Awarded contract·City of Ann Arbor·Michigan

2024 Water Treatment Plant Fi​lter 18/20 Underdrain Improvements

Won by Sorensen Gross$1.2MSingle Award
Contract source

Awarded vendors

  • Sorensen Gross

Description

This contract concerns the design and construction of underdrain improvements for the 2024 Water Treatment Plant Filter 18/20 system. The work includes civil engineering, excavation, installation of drainage piping, and associated site restoration to enhance plant reliability and compliance with water quality standards. • Scope: Underdrain installation, pipe placement, and related civil works for a water treatment filtration system. • Procurement: Open competition (ITB) with a tentative award to Sorensen Gross, pending council approval. • Documentation: Full ITB package (including plans and an addendum) is available; bids were due August 30 2024. • No explicit contract value or schedule is disclosed, implying a standard lump‑sum construction contract for a municipal water infrastructure upgrade.

Attached files

The award documents live at the source — open the contract source above to download them.

Key dates

Questions due
1/29/2026
Pre-bid meeting
1/29/2026
Bids closed
8/30/2024
Duration
730 days

Last updated

Details

Award type
Single Award
Procurement
Full and Open Competition
Solicitation
Invitation for Bid
Industry
Water Management and Sanitation
NAICS
237110
Solicitation №
ITB 4752​

Contract value

$1,200,000

No dollar amount is disclosed in the provided documents. However, typical underdrain projects for municipal water treatment facilities range from a few hundred thousand to a few million dollars, depending on length of pipe, site conditions, and material specifications. Given the “Filter 18/20” designation suggests a moderate‑size upgrade, a reasonable ballpark estimate would be between $0.8 million and $1.5 million. Assuming mid‑range complexity and standard regional labor rates, an estimate of roughly $1.2 million is plausible. This figure accounts for engineering design, excavation, pipe installation, backfilling, and site restoration, but excludes ancillary costs such as permitting or long‑term maintenance contracts.

AI estimate from the award documents

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