SWA000186_Construction Sequence_20230302

Project Narrative
The proposed project consists of the construction of six new outdoor self storage buildings and
an office. The site is located on Reynolda Road in Pfafftown, North Carolina. Existing
conditions onsite consist of an existing junk yard on the eastern side of the site with two
additional existing buildings along Reynolda Road, one of which is to be removed.
The site generally drains from east to west with a small portion of the developing area draining
to the east. There is a small stream running south to north located on the western side of the
property; no impacts are proposed. Outlets from storm drainage infrastructure are proposed to
outlet and flow over land to the stormwater control measure forebay. Design calculations for
the outlets have been completed to size velocity dissipater pads, and then will be conveyed in
a lined ditch to the SCM forebay.
In order to mitigate stormwater impacts from the construction of the project, one above ground
wet pond has been designed to treat runoff from the site in accordance with the North Carolina
Stormwater Manual and to detain post -development flow rates to be equal or less than pre -
development flow rates for the 2-, 10- and 25- year storm events.
A multi -phase erosion control plan has been designed to provide the required erosion and
sediment control protection during construction. Measures generally include silt fence, silt
fence outlets, utilization of the wet pond as a skimmer basin during construction and other inlet
and gravel protection measures. Phase one of the erosion control plan has been developed to
install perimeter measures and remove only the amount of existing site infrastructure
necessary to install the wet pond and skimmer and clear and grub the area to be developed.
Stage two progresses with the installation of infrastructure, and addresses erosion control
once the site has reached finished grade and installation of storm drainage piping and fill has
been placed.
Future development of the property is anticipated to include construction of additional storage
facilities placed on fill between the current proposed locations and the stormwater
management facility. At that time we believe that storm drainage infrastructure will be extended
to the forebay of the pond.
In conclusion, as proposed the development as designed will meet stormwater quality
requirements and detention requirements as the pond meets the 2-, 10, and 25- year detention
from predevelopment to post development rates.
Detention Summary
POA #
2-Yr Storm cfs
10-Yr Storm cfs
25-Yr Storm cfs
1
5.59
2.69
-529/(o
18.89
14.34
-24%
28.71
26.41
-8%
2
1.63
1.51
-7%
5.16
3.99
-23%
7.76
5.74
-26%