Hornsby Bend Ammonia Removal Facility And Drainage Imp.

The City of Austin is seeking bids for the construction of an on-site Ammonia Removal Facility at the Hornsby Bend Biosolids Management Plant to treat high-strength ammonia and nitrogen side streams generated from anaerobic digestion of wastewater sludge. Currently discharged into the on-site pond system, this effluent must be treated to meet environmental regulatory standards, with the new facility projected to reduce ammonia loads by 80 to 90 percent. The project also includes essential drainage and stormwater management upgrades to support the facility’s operation and ensure proper site hydrology. The work is structured under CIP IDs 3164.125 and 3164.094, which are being bundled and bid together as a single project. The solicitation, identified as IFB 6100 CLMC1165, has a response deadline of August 6, 2026, and is open to local contractors with an NAICS code of 237990. The total estimated contract value ranges from $6.4 million to $8.0 million, anchored by a $6.07 million lump sum allowance for the ANITA MOX® MBBR deammonification system, along with supplementary allowances for the equalization basin mixer, contaminated soil and water removal, rip rap, and security upgrades. The contract is structured as a fixed-price arrangement, with payments based on unit prices and mobilization timelines, and is subject to a 25 percent maximum increase without contractor consent. The performance requirements are rigorous and comprehensive, demanding the installation of a 60x70-foot concrete equalization basin, a three-pump transfer lift station, and all associated mechanical, electrical, and control systems, with full operational testing and certification mandated. Equipment must meet UL, CSA, NEC, OSHA, and other industry standards, and includes stringent labeling, spare parts provisions (10 percent of each item or minimum two units), and long-term warranties—10 years for door closers and five years for panic hardware. All construction personnel must hold OSHA 10-hour certification, and submittals must include detailed shop drawings, operational and maintenance manuals, factory test reports, and seismic certifications. The contractor must also comply with MBE and WBE participation goals through a documented compliance plan, with good faith efforts required if targets are not met. The place of performance is the Hornsby Bend facility in Austin, Texas, with materials delivered to the