Title
Contract No. 2300154
PS 2 Bar Rack Replacement and Grit System Improvements
CIP #211007/BCE Score: 75.7
Body
Agenda of: September 25, 2024
Item No.: 2024-284
Amount: $224,985,000.00
TO: The Honorable
Board of Directors
Great Lakes Water Authority
FROM: Suzanne R. Coffey, P.E.
Chief Executive Officer
Great Lakes Water Authority
DATE: August 30, 2024
RE: Contract No. 2300154
PS 2 Bar Rack Replacement and Grit System Improvements
Vendor: Commercial Contracting Corporation
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 Chief Executive Officer (CEO) to enter into Contract No. 2300154, "PS 2 Bar Rack Replacement and Grit System Improvements" with Commercial Contracting Corporation, at a cost not to exceed $224,985,000.00 for a duration of 2,008 days; and authorizes the CEO to take such other action as may be necessary to accomplish the intent of this vote.
BACKGROUND
The Pump Station 2 Rack and Grit (PS2RG) processing system for the Water Resource Recovery Facility (WRRF) was constructed in 1990 and last improved in 2015. The PS2RG system removes floating debris and grit from the waste stream before it enters the primary circular clarifiers for further treatment. It is estimated this system currently removes a combined ~15 tons per day of screenings and grit from Pump Station No. 2 influent. The existing system for PS2RG operates at 15% screenings removal efficiency and 32% grit removal efficiency. We estimate, as a result of this poor efficiency, that approximately 64 tons per day of screenings and grit pass through this process area and travel further into other plant processes, thereby causing other issues further downstream, such as greater wear and tear on pumping or solids processing equipment, or higher inorganic solids content making processing of the biosolids more difficult. The processi...
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