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Development of a Phosphorus Control Plan for the Lake Champlain Basin

The Lake Champlain Phosphorus Total Maximum Daily Load (TMDL) was finalized by the Environmental Protection Agency (EPA) in June 2016. The TMDL requires the development of Phosphorus Control Plans (PCPs) to identify and document a suite of best management practices (BMPs) that will be able to achieve reductions in the amount of phosphorus in stormwater discharges as required by the TMDL. For the Missisquoi watershed, Stone developed an enhanced hydrography dataset; identified areas of potential localized erosion; identified hydrologically connected road segments; defined phosphorus control plan areas in remaining drainages; investigated approaches for assigning phosphorus loading

For the Missisquoi watershed, Stone developed an enhanced hydrography dataset; identified areas of potential localized erosion; identified hydrologically connected road segments; defined phosphorus control plan areas in remaining drainages; investigated approaches for assigning phosphorus loading factors, and developed coefficients for phosphorus loading for VTrans’ land uses in the watershed.

Stone is now extending this work to VTrans-controlled lands throughout the entire Lake Champlain Basin. Stone has been working with Vtrans to better understand the data needed and level of effort required to develop PCPs throughout the Champlain Basin, as well as the magnitude and effectiveness of potential projects that can be implemented to reduce runoff and phosphorus contributions from state-managed roadways and developed infrastructure to Lake Champlain. Many of the techniques developed in this project may be directly applicable to the Phosphorus Control Plans that will be required of Franklin County MS4s with forthcoming revisions to that permit in 2017.