Although the facility was meeting nitrogen requirements, the existing treatment process couldn’t meet required phosphorus levels. By converting the disinfection system to UV disinfection, the facility can drastically decrease chemical usage, have consistent and reliable control over the disinfection process and effectively meet all discharge permit requirements for disinfection.

Photo courtesy PCL Construction

PCL worked with the city to establish a multiple GMP approach to accelerate process equipment and materials procurement to help insulate the project from high forecasted escalation costs. The contractor held a competitive bidding process between three UV manufacturers prior to the 30% design milestone, and the team evaluated unique UV system criteria, such as power consumption, number of lamps, ballast and cost of spares.

The addition’s initial design called for a masonry building with steel trusses to match the existing facility. Given long lead times and budget constraints, the design team proposed a preengineered metal building to meet the owner’s budget and lower operation and maintenance costs while meeting the client’s criteria for durability.

Crews completed work across three phases, all of which ended on time or early, leading to an on-budget and on-time completion in May 2023.