The existing treatment facility along Austin Street was constructed around 2008. Due to flooding concerns, a portion of the upper system is not currently in use. The new system will install an impermeable liner to address the flooding downstream, pre-settle the stormwater to reduce sediment entering the infiltration area, and distribute the flows evenly throughout the treatment system. Typical Bioretention soil is not recommended near phosphorus-sensitive waters like Lake Whatcom. Instead, the system will use the new High Performance Bioretention Soil Mix (HPBSM) designed to capture phosphorus and other pollutants better.
Status - The consultant is preparing the final bid documents.
Next Steps - The project will solicit bids for construction in early spring 2023 for a mid-summer 2023 construction.
Schedule - TBD
Engineer - Herrera Environmental Consultants, Inc.
Construction Contractor - TBD
Construction Costs - Determined through a competitive bid
Project Benefits
Replace failing system
Improve water quality
Development of a new treatment technology
The existing treatment facility along Austin Street was constructed circa 2008. Due to reports of flooding the system needed to be taken off-line. The system experienced uneven sediment distribution, sediment impedes infiltration through the media. Typical Bioretention soil is not recommended near phosphorus sensitive waters like Lake Whatcom.
The new system will install an impermeable liner to address the flooding downstream, will pre-settle the stormwater to reduce sediment entering the infiltration, and will distribute the flows more evenly throughout the treatment system. The system will use a new High Performance Bioretention Soil Mix (HPBSM) that is designed to be better at capturing phosphorus and other pollutants.