SW8021031_COMPLIANCE_20030113

STORMWATER DIVISION CODING SHEET
POST -CONSTRUCTION PERMITS
PERMIT NO.
SW
DOC TYPE
❑ CURRENT PERMIT
❑ APPROVED PLANS
❑ HISTORICAL FILE
COMPLIANCE EVALUATION INSPECTION
DOC DATE
YYYYMMDD

DETENTION POND ANALYSIS FILE NAME: G:IDATAIWPDATAIWQSIPOND1021031.WK1
PROJECT #: SW8 021031 REVIEWER: L. Lewis
PROJECT NAME: Joe & Moe's Auto Services Site
DATE: 13-Jan-03
Receiving Stream: Shailotte River Class: C SW
Drainage Basin: Lumber Index No. LBR59 15-25-2-15-(1)
Site Area 2.19 acres
Drainage Area 722$. 00 square feet Area = 1.70 acres
IMPERVIOUS AREAS
Building
Parking
SW
TOTAL
SURFACE AREA CALCULATION
IMPERVIOUS 67.55%
Des. Depth 5
TSS: 90
7500,00
square feet
40238.00
square feet
2405.00
square feet
square feet
square feet
square feet
5014:3 C10'
square feet
SAIDA Ratio
Req. SA
Prov. SA
Rational C
Rational Cc=
4.83%
3584 sf
X. sf
VOLUME CALCULATION " place a "1" in the box if Rational is used
Rational ?*
Des. Storm
:......1.'DO
_..
inches
Rv=
0.66
Bottom
4 msl
Perm. Pool
9':Q(n msl
Design Pool
10.25 msI
Design SA
4770 sf
Req. Volume
407fJ
cf
Prov. Volume
xx-
cf
ORIFICE CALCULATION
Avg. Head =
Flow Q2, cfs
Flow Q5, cfs
No. of Orifices
Diameter, inches
Drawdown =
0.60 ft
0.024 cfs
0.009 cfs
weir HxW
days
FOREBAY
Perm. Pool Volume=
Req. Forebay Volume=
Provided Volume=
Percent=
SA @ _
Elevation=
5385
1077
1088.00
Q2 Area =
0.91
sq. in.
Q5 Area =
0.36
sq. in.
Orifice Area
0.79
sq. in.
Q=
0.020
cfs
i n
x
FTU
COMMENTS
Surface Area , Volume and Orifice are within Design Guidelines
in
M

JOE & MOE'S AUTO SERVICES, INS-a0�
SHALLOTTE, NC
STORMWATER DESIGN CALCULATIONS
FOR
SITE DEVELOPMENT
May 2002
Prepared by:
East Coast
Engineering Company, P.A.
Consulting Engineers
Shallotte, North Carolina 28459
Post Office Box 2469 4918 Main Street
Office: 910.754.8029

r
O
U
cn
m
W
C
6L
0
U.
L
0
d
L
0
N
N
3
c�
w
7
C3
L
m
��o
0
O
Cf)
O
L
O
L
O
L
O
N
CAA
N
U
N
i=
N
U
(A
(�S
N
U
N
C
C
C
N
(A
co
N'q
(7
(D
ti
to
OD
�
00
O
1'-
N
O
w
w
M
r
M
N
Lo
N
O
Iti
cD
m
v
N
O
O
ce)
(D
(D
Q
O)
co
(D
m
O
O
M
1~
In
O
Lo
N
1-
co
O
N
N
r
o
(D
O
N
u7
M
O
0
}
r
0
ti
r
0
O
0
0
O
O
O
of,_
CD
O
ti
W
q'
C
r
IA
O
CD(D
O
d
O
r
O
O
O
IL
a)
E
c
m
%
E
L
N
N
N
Q)
Q
a
00 M
X
J
U)
N
O
O
U.)
Co >
-a
(V
N
T
u)
X
O
T
T
=
C
c
II
EEL
—
D
r"
C)
O
7
7
p)
O
O
_o
x
Q)
a
I I
O 'r
�
a)
N
a)N
CD
N
-
s
C? x>
O C
11
a
0
m
O
m"
O
c
s
ro
O
CL
N
O
❑
o+�
W
O
�t6
VJ
v
v
E
r
a
X
Lo II
C
(LU
U
'a
C
rr
X
X
O
N
O
QO
E Op0
(n
N
N
LN
m
�
U
a0
U
N
r
CO
Q
aLL
Q
��>
1' Q
C
C
C
r
c0
11
11
k
II
I I
I I
s
U
Q
Q
Q
z
0
L
V
V
b
o
U
U
p��
aci
b
m
N
U
m
U
m
U
II
II
N
nn��
�
(0
Cyh..
V
�
Y"
m
_
$
,�
+:
,E
..
` Y
Y+
Q�
co
L
Otl
Wcl
W
q)
O
O
co
co
.O
Z
-
+—
ro
CL
p
N
Q)
cC
I
O
-0
-0
O
C
A
4
Q
r-LO
m
Cl)¢
m
b
t
p
41
q)
O
_
co
m
(p
co
y
b
b�
b
U
-�
c
o\°\°
co
Q
Q
'b
b
Cn
o
Q
F`
m
a
co
Q y
>
L
a��i
coo
Cn
c6
Ycvs,O
w
�,
Z30-
U
o
o
�ZEZ
nw
�n
oc
z
a
Cr
�o�
ro
Q
�QQ
Q��
dL�
V)w
c
cy

�§
§
0
§ ci 6 00 °
Q
b § \ 7 /
\ o o
_ \
E
\§kk\k/ \7
E
/
� §
°®Im
Sƒ 2 E k§; g f
@2\��kkE2f�f
c c m g a a q u]§ d\
q
k
f
\
k
CL
o
�
ja
§ § f § B
§ § (D
w § f \
Lr) H
a R
§ 2
U
<
E z
Cl)
-
cc
<
/
)
} \
§
-
E
/ 4/
4\
a 0
It
\
%t
)
cn
§
\ &
±f<
(b
\
\
k
_
\
k

Joe and Moe's Auto Repair Service, Inc.
Forebav Calculations
TOTAL POND VOLUME at PERMANENT POOL
East Coast Engineering Company, PA
SMH
FT MSL) AREA (SF) VOLUME (CF) VOLUME (CF)
4 78
169 169
6 544
731 1303
7 919
1302 2604
8 1685
2257 4861
20% OF PERMANENT POOL VOLUME = 972.253
Surface area at Permanent Pool @ 9 3602
Surface area at Storage Pool @ 10.25 5014
Total storage volume provided 5385 cf
FOREBAY VOLUME at PERMANENT POOL
ELEVATION SURFACE INCREMENTAL ACCUMULATIVE
(FT MSL) AREA (SF) VOLUME CF VOLUME (CF)
6 95
163 163
7 231
345 508
1
Sheet 3

kI
62
n
¢
\
LU
\
0
)
0:
§
2
�_j
�w
&6
\q
\�
LU�
o
r
f
n
\
22
\m
/�
7�
K
Q\
2
/ \
ƒ
E
%
\
\
\
�
®
2
\
/
/
\
d
6
c
m
o
�
m2
U
E
\
g
9
¥
0)
a
R
/
2
o
Q
O
/
\
/
:
K
_
-
o
�
/
k
w
�
k
%
b
ƒ
LU
i
w
w
�
\
\
/
w
LLJ
Cl)
®
®
\
w
w
z
/
z
7
\
§
A
o
@
w
/
k
-j
0
®
m
>
/
�
z
D
2
7LL
e
z
±
w
I_
-
6
w
=
u
O
n
w
2
<
/
_m
\
\
ƒ
3
®
E
O
f
,It
k
m

7 W 742
7130'
o 001
73B
25' 3y
218C 000 FEET
1765
C
rJ r)
r:,
socc
Lj ' ( -
FEET
7
; I
�
'u
J!
fl,
7
�)34&1
-39
A
130,
r
so 'A
Radio,
CL
er
;no
"WIN
'I BTUnswlc
Gri(✓
e"Qh
4w
mot
�A
un pl
cu'r t
4,
mes' h
Y
s
0 -g'-
r,fl Masonic
-AO
a I I nt1pe TOY—w r s h i
xl_
4
L79
V rtOn
. - rA
Y
52
A
NJ IR
Chur Go
0
m
B
bun d I f
Peasant Hill
.0
33
57' 30"
760
3759

NARRATIVE
for
Joe & Moe's Auto Services, Inc.
Shallotte, Brunswick County, NC
.DESCRIPTION
The site is a 2.19-acre tract located in Shallotte, NC, at 5651 Main Street. The
proposed development on the site is a commercial development consisting of an auto
service center with adjacent parking and display area. The project is an expansion of the
existing business on the site. The site has an existing garage and a gravel circle drive
with an asphalt entryway from Business Hwy 17. A 1.70-acre section of the site will be
disturbed and graded to accommodate the proposed plans. Construction is scheduled to
begin as soon as all permits and approvals are obtained.
STORMWATER MEASURES
The stormwater runoff from the site is estimated using the rational method. The
site is located near the origins of the Shallotte River and classified as C-Sw, HQW
waters. The first inch (1.0") of rainfall is accounted for in the design. The stormwater
will collect into one (1) wet detention basin (pond) on the site. The pond is designed so
the 25-year storm event, using rainfall data for the area, will not overflow the available
freeboard. The stormwater run-off will be directed to the pond by proper grading of the
asphalt paving and curbing around the perimeter of the parking and driveways. No
pretreatment device is designed for the pond other than the proposed forebay.
EROSION CONTROL MEASURES
The perimeter of the project area will be protected from erosion and
sedimentation runoff with silt fencing. Vegetation will be established quickly in the
disturbed areas not to be paved after the initial grading activities have concluded.
Excelsion matting will be used as necessary to eliminate soil erosion. The 'grading
contractor and the developer will provide the maintenance for the erosion control
measures.
CONSTRUCTION SEQUENCE
The Contractor will install silt fence prior to beginning any clearing and grading
operations. The wet detention basin will be constructed immediately after that portion of
the site is graded, and the outlet structure will be installed. The disturbed areas will be
landscaped and seeded upon completion, and as soon as possible. The building will be
constructed and the paving will be installed as per the design plans. The wet detention
basin will be restored to design depth after completion of all other construction.