SW6221103_Stormwater Narrative_20221128

DocuSign Envelope ID: 7D8BBAD3-49CA-494D-8540-BE287C7FDFB1
5245 Red Hill Church Rd
FLEET TEM PLE Coats, NC 27521
ENGINEERING 910.658.2446
[e-mail]
PLLC Firm License P-2357
Iron Man Self Storage
Anderson Creek Township, Harnett County
09.14.2022
PROJECT NARRATIVE
Project & Site Description
The purpose of this project is to develop a 8.2 acre commercial site (outdoor PV/boat
storage). The property is existing undeveloped land and woodland. Existing
topography drains to the north and east at slopes of approximately3% -10% to an un-
named tributary S. Prong Anderson Creek. No wetlands will be disturbed on the Site.
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 BnB (Blaney loamy sand, 2 to 8 percent slopes), GaB
(Gilead loamy sand, 2 to 8% slopes), and Pa (Pains sandy loam).
BnB is categorized as well drained, moderately slowly permeable, and is moderately
suited to most urban and recreational uses. GaB is categorized as moderately well
drained, moderately slowly permeable, and is moderately 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 Management. 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 yard areas over the natural contours of the Site. Project
impervious percentage is limited to 24%. Proposed impervious limits as follows:

DocuSign Envelope ID: 7D8BBAD3-49CA-494D-8540-BE287C7FDFB1
IMPERVIOUS AREA CALCULATIONS:
TOTAL PROPERTY AREA 3SS,380 SF
IMPERVIOUS AREA ALLOWED: 24% MAX (LOW DENSITY)
3SS,380 SF X 0.24=85,291 SF MAXIMUM ALLOWABLE IMPERVIOUS
IMPERVIOUS AREA BY DESIGN
10,780 SF ROAD (R/W)
35,232 SF (GRAVEL- LOT1)
36,921 SF (GRAVEL- LOT2)
82,933 SF TOTAL IMPERVIOUS BY DESIGN (23.3%)
CA
44 �+ =
433
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9/22/2022