SW4210803_Stormwater Narrative_20220120

PROJECT NARRATIVE
The proposed project, "Community Road Substation" is a substation development that is located in
Lexington, North Carolina. The site is located on Community Road south of Mt Olivet Church Road and
north of Enterprise Road. The proposed entrance is on Community Road.
The project site is not located in Zone X per FEMA Flood Map Community Panel Numbers: 3710681000J,
dated March 16, 2009. The existing site consists of mostly planted fields with the southwestern part of the
site wooded. An existing 200' Duke Energy transmission line and 200' right-of-way are located directly
northeast of the site. The existing storm water runoff flows across the full site into the wooded area in the
southwestern corner which drains into Huffman's Creek. There are no known flooding problems located
either downstream or immediately adjacent to the site.
The proposed site will be a roughly 0.75 AC fenced -in gravel lot with a 20' wide gravel entrance drive from
Community Road. There will be a total of one (1) dry detention basins on site, which is not a required SCM.
There will be conveyance swales for other drainage coming from on and off -site The site will be graded in
one phase. The total site, including the offsite gravel access drive will disturb approximately 2.82 acres.
The total on -site drainage area for stormwater permitting is 2.46 acres.
On site erosion control measures will be provided throughout the construction phases. The erosion control
plan will have two (2) phases. These erosion control measures include one (1) skimmer type sediment
basin that has been designed to meet the North Carolina Erosion and Sediment Control Planning and
Design Manual.
Conclusion
The proposed dry detention basin and conveyance swales will help route and control stormwater from the
proposed development. The optional dry detention basin will help detain the majority of stormwater flows
and release them in a manor at or below pre -development rates.
In conclusion, due to existing site conditions and proposed runoff control measures, the proposed project
is not anticipated to have negative impacts on downstream or adjacent properties.