Title
Contract No. 2002915
Redesign of Circular Scum System and
Scum Concentration Facility
Body
Agenda of: February 23, 2022
Item No.: 2022-045
Amount: $2,240,403.00
TO: The Honorable
Board of Directors
Great Lakes Water Authority
FROM: Suzanne R. Coffey, P.E.
Interim Chief Executive Officer
Great Lakes Water Authority
DATE: February 1, 2022
RE: Contract No. 2002915
Redesign of Circular Scum System and Scum Concentration Facility
Vendor: Arcadis of Michigan, LLC.
MOTION
Upon recommendation of Navid Mehram, Chief Operating Officer - Wastewater Operating Services, the Board of Directors (Board) of the Great Lakes Water Authority (GLWA), authorizes the Interim Chief Executive Officer (ICEO) to enter into Contract No. 2002915, "Redesign of Circular Scum System and Scum Concentration Facility" with Arcadis of Michigan, LLC., at a cost not to exceed $2,240,403.00 for a duration of 1,825 Days; and authorizes the ICEO to take such other action as may be necessary to accomplish the intent of this vote.
BACKGROUND
The Water Resource Recovery Facility (WRRF) at the Great Lakes Water Authority (GLWA) utilizes primary treatment to meet effluent limits required in its National Pollutant Discharge Elimination System (NPDES) permit. The GLWA WRRF facility operates 12 rectangular clarifiers with 90 million gallons per day (MGD) and 6 circular clarifiers with 180 MGD capacity that provide primary treatment. Part of the primary treatment process is to remove floatable fats, oils, and grease (FOG) or scum from the wastewater stream. The primary circular clarifiers and primary rectangular clarifiers each have an independent scum collection, conveyance, and disposal systems.
For the circular clarifiers, the scum is removed from the surface of each clarifier with skimmers, attached to a collector arm that radiate out from the tank's center drive. As the scum collector arm rotates, it pushes the accumulation of material on the surface of the water onto either on...
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