BL011-26, Purchase of Replacement Mixers for Digestors 1 and 2 at the F. Wayne Hill Water Resources

Gwinnett County Board of Commissioners, Department of Water Resources, is soliciting competitive sealed bids for the purchase of two replacement draft tube sludge mixers for Digesters 1 and 2 at the F. Wayne Hill Water Resources Center. The procurement encompasses propeller-type mechanical mixers with top-mounted drive assemblies rated at 6,500 gallons per minute capacity, designed for 1.0 million gallon egg-shaped digester tanks, with 20-horsepower maximum motors operating at 480 volts three-phase, 60 Hz, and 900 rpm maximum speed in Class I, Division 2, Group D hazardous environments. Deliverables include the two complete mixer systems with intake sections, splash discs, mixer shafts, impellers, bearing housings, motors, motor pedestals, grease pumps, shaft protection sleeves, discharge sections, seating rings, coatings, tools, spare parts, submittal preparation with shop drawings, vendor site visit for field verification, Operations and Maintenance Manuals in hard copy and electronic PDF format, onsite installation assistance (four days total across two trips), field and functional testing (two days total across two trips), and one day of vendor training for Owner personnel. Qualified vendors must conduct mandatory site visits to verify existing equipment dimensions and ensure compatibility, submit comprehensive technical documentation including shop drawings, performance specifications, motor efficiency test results, vibration signatures, and factory shop testing reports demonstrating minimum 8-hour continuous operation with hourly measurements of shaft speed, power draw, pumping rate, and vibration. Equipment must comply with NEMA, IEEE, ASTM, AWS, and AGMA standards with ASTM A36 structural steel, ASTM A576 shaft material, and Class F insulation motors with minimum 94 percent efficiency. The pre-bid conference is scheduled for 10:00 A.M. on March 12, 2026, at the F. Wayne Hill Water Resources Center in Buford, Georgia; questions must be submitted to Anna West, Purchasing Associate II, no later than March 27, 2026; sealed bids must be received by 2:50 P.M. on April 8, 2026, with virtual bid opening at 3:00 P.M. the same day. Award will be made to the lowest responsive and responsible bidder, with warranty covering mechanical parts for 36 months from delivery, ending no later than 42 months after advice of readiness for shipment.

This solicitation is not subject to any specific set-aside program for disadvantaged enterprises. Bidders currently on the Gwinnett County ineligible source list are prohibited from submitting offers, and all contractors must comply with E-Verify participation requirements and the Illegal Immigration Reform Enhancements for 2013. Insurance requirements include Commercial General Liability with minimum $2,000,000 general aggregate and $1,000,000 per occurrence, Automobile Liability of $1,000,000 combined single limit, Workers Compensation at Georgia statutory limits, and Umbrella/Excess Liability based on contract value, with all insurance companies requiring an A.M. Best rating of A-7 or higher and authorization to do business in Georgia. Contractors must submit a Code of Ethics affidavit, non-collusion certification, and three project references of similar scope, with preference indicated for vendors with existing Gwinnett County locations. The replacement equipment must integrate with existing F. Wayne Hill Water Resources Center infrastructure designed for the current MFS-4 Draft Tube Sludge Mixer specifications, with approved equivalent manufacturers such as Ovivo or WesTech permitted subject to submission of complete product documentation for Owner and Engineer evaluation and final approval. No specific budget range is disclosed in the solicitation documents; however, pricing shall include all charges for equipment delivery and field startup services to the installation contractor, with payment made within thirty days of receipt of approved payment requests and interest accruing at a stated monthly rate if payment exceeds sixty days.