TO: Mayor and City Council
FROM: Beth Beatty, City Manager
SUBJECT:
title
Professional Services Agreement for the Westside Wastewater Treatment Plant Expansion Project to Strand Assoc Inc. in the amount of $6,175,114.00
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BACKGROUND:
The Westside Wastewater Treatment Plant, which provides wastewater treatment for portions of Joliet, Channahon, and Shorewood, was constructed in 1972 and had its last major upgrade in 2002. Many of the facilities and equipment at the plant have reached the end of their useful life and need to be replaced to meet current design and code standards. In addition, regulatory changes have resulted in the need to upgrade certain processes to meet lower limits. Furthermore, additional development in the service area is expected to occur which necessitates the need for expansion of the Plant's treatment capacity.
In 2019, the City retained Strand Assoc Inc. to complete a capacity evaluation at the Westside Wastewater Treatment Plant. The plant is currently permitted to treat a design average flow of 14 million gallons per day and a design maximum flow of 28 million gallons per day. Current average day flows are approximately 12 million gallons. With anticipated growth to occur in the Westside service area, it is critical that the City expand treatment capacity.
In 2021, Strand Assoc Inc. prepared a Project Plan for the Westside Wastewater Treatment Plant expansion which was the first step in obtaining approval from IEPA to expand the wastewater treatment plant. The Project Plan identified the following improvements necessary to expand the treatment capacity to 18.16 million gallons per day, upgrade aging facilities and meet new regulatory requirements:
? Add 4th influent pump
? Replace wet weather screens
? New grit and primary scum removal systems
? Rehabilitate existing and add primary and final clarifiers
? Add aeration tanks and implement biological nutrient removal
? Anaerobic digestion upgrades and expansion
? New sl...
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