SW4210703_Stormwater Narrative_20210803

Stormwater Treatment & Management Narrative
Middleton Subdivision
July, 2021
The Middleton subdivision is a single family subdivision located along Hege Road
west of the intersection of Hege Road and South Union Grove Road in Davidson
County, The site is located within the NPDES Phase II area. It is now owned by
Sagamore Homes NC, Inc.
The subdivision is planned for 30 single family lots with approximately 1,323
linear feet of ribbon paved road. With a site area of 18.67 acres and a built -
upon area of 15.0%, the site is a low density development.
Vegetated roadside ditches are utilized along all roadways. A side slope of 3:1 is
utilized on each side of the ditches. Calculations are included that show no
erosion should occur during the 10-year storm event.
Riprap stormwater outlets have been engineered to prevent downslope erosion
at all discharge points while also creating dispersed flow. Discharges occur a
minimum of 120 feet from jurisdictional streams which allows flow through a
vegetated buffer prior to reaching the streams.
All of the runoff for the site flows into Fryes Creek (12-94-15 Class Q.
An Erosion and Sedimentation Control Plan was approved for the site on 3uly 10,
2020. The subsequent Certificate of Coverage was obtained on 3uly 16, 2020.
Measures have been put in place to help prevent any off -site sedimentation
during the construction activities. A copy of this plan is also included in this
submittal. Sediment basins and other erosion control devises will remain in place
until site stabilization has occurred.
Following the completion of the home construction, the lots will be sold to
individuals and the common areas will be transferred to a home owners
association.