Biofilter Infrastructure Upgrades

This contract awards the design‑build of Phase 1 aerated biofilter upgrades at Appleton International Airport, encompassing storm‑sewer modifications, concrete manhole installation, recirculation and sprinkler systems, biofilter planting, and associated electrical work. The work is to be performed under a competitive sealed‑bid process, with a base‑price award to Advance Construction and an alternate A for a concrete ditch. The project must be substantially completed by mid‑November 2024, with penalties for late completion. • Scope: removal, grading, new concrete structures, biofilter aeration & recirculation pumps, sprinkler system, landscaping, and electrical upgrades. • Procurement: sealed bid, unit‑price schedule, award to a single contractor (Advance Construction). • Timeline: start mid‑August 2024, finish by 15 Nov 2024; bid deadline 4 Sep 2024; Addendum issued 29 Aug 2024. • Financials: Base bid $626,061 plus $51,750 for Alternate A, total approx. $678 K. • Compliance: Requires FAA Form 7460‑1 submission, adherence to WisDOT and FAA specifications, insurance/bonding per Attachment A.