SW6220503_Stormwater Narrative_20220605

5245 Ratsl,NC2 Church2
Rd
FLEETTEMPLE C11
ENGINEERING 910.658.2446
[e-mail]
PLLC Firm License P-2357
Evit's Place
Grove Township, Harnett County
03.18.2022
PROJECT NARRATIVE
Project & Site Description
The purpose of this project is to develop an 8.34 acre residential subdivision. The
property is existing farmland and woodland. Existing topography drains to the north
and east at slopes of approximately 2% -10%to Black River (East) and to an un-named
tributary Black River (North). Wetlands have been delineated on site. The entrance
drive will require land disturbance wetland permitting. Necessary permits will be
obtained from a licensed professional. The Site is limited to maximum 24% impervious
area upon build -out (Low Density Development).
Adjacent Property
The land uses in the surrounding areas are residential and agricultural.
Soils
The soils in this project consist of primarily of NoB (Norfolk sandy loam, 2 to 6%slopes),
NoC (Norfolk sandy loam, 6 to 10% slopes), and Pa (Rains sand loam).
NoB is categorized as well drained, moderately permeable, and is well suited to most
urban and recreational uses. NoC is categorized as well drained, moderately
permeable, and is well suited to most urban and recreational uses. Pa is categorized
as poorly drained, moderately permeable, and is poorly suited to most urban and
recreational uses.
Planned Stormwater Manaaement. Erosion and Sediment Control
As shown on the Erosion Control Plan the project will be controlled and stabilized with
diversion berms, silt fence, rock check dams, and temporary skimmer basins with
baffles. Diversion berms will be constructed from topsoil graded from the site and will
be backed with silt fence where needed. All measures will be constructed and
maintained to NCDEQ & Harnett Countystandards and requirements.
After erosion control measures are removed. Surface waters from the roadway areas
will drain via grassed roadside ditches to owner maintained grassy swales which will
convey the runoff from the property. Impervious areas on some portions of the lots
will surface drain through the grassed yard areas over the natural contours of the Site.
Project impervious percentage is limited to 24%. Proposed impervious limits as
fo I I ows:
363,092SF*0.24=87,142SF MAX IMPERVIOUS AREA
ROADWAY AREA: 22,763SF
12 LOTS (a MAXI M U M 5,300SF/LOT: 63,600SF
TOTAL IMPERVIOUS BY DESIGN: 86,363SF (23.8%)