SW6210907_Stormwater Narrative_20210930

Storm wafer Management Report
September 2, 2021
Timberland Gas Station
Calloway Road
Hoke County, NC
Prepared for:
Double D Engineering, PLLC
150 S. Page Street
Southern Pines, NC 28387
910-684-8646
Prepared by:
Triangle Site Design, PLLC
4004 Barrett Drive, Suite 101
Raleigh, NC 27609
[phone]
License#P-0619
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TABLE.- QF - CORTENTS
WKS
WSGS WORATHO MAj-
FFMI rpm MAP
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SHE REPOW
WAIER OUANTITY-INVILTRATION BASIN
OWN ARVA ON
Jsa EU&J mNT
32-RACE«« HYS (I A P P
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'WE S. ELLVAhON (won)
KLEVAKON VOLUME-ILDW SOMM40
SCV SUMMARY
DMI 01 CONCENINKON

YERVI.EW
This report contains the storm water mancgement overview for the proposed gas station
site on Calloway Road in Hoke Cour: y. The project site is currently un—developed. The
proposed site consists of 4.392 acres and approximately 3.72 acres will be disturbed as
part of this project for the construction of the site improvements.
The proposed site is located it Flood Zone `X' as shown on FEMA FIRM Panel 3710940400J
with an effective date of I0/17/06. Flood zones are subject to change by FEMA.
There are no existing stream or wetland features on the proposed property.
The
drainage
area consists
cf 18,267sf (0.42 ac) off—sife area that will be considered
100% BUA.
The proposed
sfcrrn water management
facility (infiltration
basin) outlined in
this
report has been designed for post —development
peak attenuation to
treat the impervious
areas
of the
development.
The Infiltration Basin is
designed to capture
a drainage area of
2.90
cc with
an impervious area of 2.02 or,. The
balance of the site
is open space and
will
by—pass
the proposed
SCM. The SCM are designed to treat a 1.0"
storm event.
ImRsaleis-
Parkina _
59,359
1. 6
Sidewalk_
2,338
0.05
BuildkN _
8,000
0.18
Off -site
18 267
0.42
Total IA to Pond.
395 036
2.02
Soils.
The County Soils Survey indicates that Autryville Loamy Sand and Candor Sand soils are
present ❑n the site.