Project At A Glance:
A portion of Stevens Brook in St. Albans is classified as stormwater-impaired under the EPA 303d waters list. The City of St. Albans contracted Watershed to complete a watershed-wide retrofit assessment and modeling study for flow restoration of Stevens Brook as part of the implementation of the Total Maximum Daily Load (TMDL) plan for the watershed.

Client: City of St Albans

Partners: Lakeside Environmental Group

Location: St. Albans (Town and City), VT

Description:

Watershed was contracted by the City of St. Albans, under the Vermont Department of Environmental Conservation’s Ecosystem Restoration Program, to complete a stormwater retrofit study of the Stevens Brook impaired Watershed for implementation of the Stevens Brook TMDL, and MS4 stormwater permit compliance. Stevens Brook drains into nutrient-impaired Lake Champlain, therefore reducing polluted stormwater flow to Stevens Brook is important in preventing pollution of the lake. Watershed was responsible for assessing existing stormwater treatment practices for retrofit potential, and completing a Watershed-wide retrofit assessment for implementation of the Stevens Brook TMDL, as measured by reductions in the stream’s high-flows.

The Team determined optimal locations for proposed BMP’s, completed BMP designs, and assessed the watershed-wide impact of the proposed retrofits using the VT Best Management Practice Decision Support System (BMPDSS) model. In partnership with Lakeside Environmental Group, Watershed developed design plans for each recommended retrofit along with an assessment of financial and technical needs, land ownership, natural resource constraints, and permitting considerations.

Additionally, the team assisted the City and Town of St. Albans, and VTRANS with outlining permitting constraints related to compliance with their MS4 permit.