SW6211204_Stormwater Narrative_20220216

noch
n o ch P.A.
Joe E. Godwin Sr., P.E., P.L.S. Consulting Engineers & Surveyors Phone: [phone]
[phone]
1403 NC Hwy 50 South Fax: [phone]
Benson, NC 27504 Email: [e-mail]
Lane Farms
Buckhorn Township, Harnett County
STORMWATER NARRATIVE
Project Description
The purpose of this project is to develop a 16 lot residential subdivision. The subdivision site is 20.94
acres and is located along Wade Stephenson Road (SR 1407) at its intersection with Truelove Rd. (SR
1452) in Buckhorn Township, Harnett County, NC. Construction of streets, utilities, associated storm
drainage as well as temporary skimmer basin area has been considered in this land disturbance activity
for a total disturbance of 2.8 acres.
Site Description
The site is existing woods and open farmland. Existing topography drains to the north and south with
slopes ranging from approximately 1% - 8%. The site located in HQW/ORW Area and is designed for
maximum 12% impervious area upon build -out (Low Density Development).
Adjacent Property
The land uses in the surrounding areas are residential and undeveloped.
Soils
The soils in the project area consist primarily of
CeB (Cecil fine sandy loam, 2 to 8% slopes), CeD (Cecil fine sandy loam, 8 to 15% slopes), DoB
(Dothan loamy sand, 2 to 6% slopes), and FaB (Fuquay sandy loam, 0 to 6% slopes). CeB is categorized
as well drained, moderately permeable, and is well suited to most urban and recreational uses. CeD is
categorized as well drained, moderately permeable, and is moderately suited to most urban and
recreational uses. DoB is categorized as well drained, moderately permeable, and is moderately suited to
most urban and recreational uses. FaB is categorized as well drained, moderately permeable, and is
moderately suited to most urban and recreational uses.
Planned Stormwater Manaizement, Erosion and Sediment Control
As shown on the Grading, Drainage, and Erosion Control Plan the project will be controlled and
stabilized with diversion berms, silt fence, straw w/net matting, rock check dams, and temporary
skimmer basins w/baffles. Topsoil will be wasted on -site as non-structural fill material and berms will be
constructed from topsoil graded from the site. Skimmer basins will be constructed with baffles and outlet
protection. All measures will be constructed and maintained to NCDEQ standards 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 12%. Proposed
impervious limits as follows:
912,320SF*0.12=109,478SF MAX IMPERVIOUS AREA
ROADWAY AREA: 29,549SF
16 LOTS @ MAXIMUM 4,995SF/LOT: 79,920SF
TOTAL IMPERVIOUS BY DESIGN: 109,469SF (11.99%)