St. Johns County Masters Tract Regional Stormwater Treatment Facility
St. Johns County is required to implement projects to reduce nutrient loads to the Lower St. Johns River in order to meet Total Maximum Daily Load compliance goals of the Lower St. Johns River Basin Management Action Plan. To assist the County in this endeavor, Jones Edmunds prepared a Preliminary Engineering Report and is in the final design and permitting stages for the Masters Tract Regional Stormwater Treatment Facility. The Master’s Tract is a 272-acre parcel of land owned by St. Johns County adjacent to Deep Creek, a tributary of the Lower St. Johns River. Stormwater runoff from upstream areas is negatively impacted by heavy agricultural uses, resulting in high nutrient loads to Deep Creek. The preliminary engineering report focused on optimizing nitrogen removal through multiple treatment methodologies, including wet pond construction, stormwater harvesting, infiltration canals, and variety of constructed and enhanced wetland communities.
The final construction documents include details for routing incoming creek flows to a stormwater pump station that discharges to a regional stormwater basin for initial treatment and nutrient removal. Water is then routed to agricultural irrigation (i.e. stormwater harvesting), vegetated infiltration canals, or a series of wetlands for further treatment.
Secondary benefits that this project provides to the County include a water source for agricultural reuse and portions of the constructed wetlands being used to provide wetland credits to offset the future impact of an unrelated County roadway project.
Other services provided by Jones Edmunds included conducting ecological and habitat assessments of the property, reviewing and analyzing two nearby regional stormwater treatment facilities, and providing funding assistance.