SW8040805_COMPLIANCE_20040813

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

DETAILED NARRATIVE
STORMWATER PLAIN
Ct'.MI.ON ASSISTED LIVING, LLC
SOliTHPORT, NORTH CAROLNA
August 13, 2004
RECEIVED
AUG 13 2004
DWQ
PROD #
This project is located just north of Southport along SR 1527. The site is a 4.48 development. It
will be a high density project with approl unately 36 percent impervious. Attached is a vicinity
map for your reference.
After our preliminary meeting with Linda Lewis we decided to utilize a pond that will remove 90
percent of TSS. A vegetated filter will not be necessary. This system will increase the
effectiveness of the treatment system and reduce the long term maintenance issues associated
with a vegetated filter system.
The site slopes from about elevation 25 to around elevation 8 or 9. The front half of the site will
use a collection system of pipes beneath the asphalt parking area.. The back half of the site will
utilize grassed swales for the majority of the collection and transportation to the treatment system.
The vegetated swale will assist in the treatment of the stormwater by allowing some of it to soak
into the ground prior to reaching the pond area. The roof drainage will be collected in pipes and
discharged to either the grass swale or the collection pipe in the front of the building. -
In an effort to ma_-xinuze the effectiveness of the pond treatment system the stormwater collected
in the front of the site will be piped to the back to discharge into the forebay area. This is in lieu
of adding a second forebay in the front.
Since this project is located in the City of Southport's jurisdiction we have also designed the pond
so that the flow from a 25-year storm will not be any larger that the pre -construction flow from a
25-year storm. We also routed a 100-year storm through the pond to verify the elevations and
have established an emergence overflow in case the main outlet gets clogged. The overflow if set
above the 25-year storm elevation and in fact is actLiallv_ set above the 100-pear storm elevation
according to the routing data.
The normal pond elevation is actually set above the adjacent wetlands. This means that the pond
system will not drain the wetlands. In fact, it will probably assist in keeping the area moist.

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a CHURCH
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'ES
I� 1, L7 HicNWAYGARAGE OR &ra r YARD
1516 F Haan I' � { C) IWIWAY OIv,OR DIS7, OFFICE
k d:i 1317 ••' a, WEIGHTSIATICu
PATROL STATION
L 1 I A REST AktA
O MONUMENT—SMA[E HISTORICAL SITE
1515
sj 1,5 ISxI
14'05'
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L3NG SPRING A
AKES /
POP. 9Vg
`+ c ORTON
J PLANTATION
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Orton GARDENS
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otn ea4NswlcK
RUIN
_ i I INTRACOASTAL '
i' /' pWATERWAY
l,' !2y 1 EU//Ifl ' Ji94 — 224 130P 1}47
�- Lip p — I]9R ]li
SUNNY POINT
ARMY TERMINAL 1
lIII KEY TO COUNTY ROAD NUMBERS
AcCE55 + / / _
NSALL �}55�s-10
J�
Par-r
1 7., ,sue "/ -.. . ��;j(i f� ,•��� RUNSWICK COUNN'TY...
-� NORTH CAROLINA
PREPARED BY THE
NORTH CAROLINA DEPARTMENT OF TRANSPORTATION
Cg� sx� I xi t, ZEKI� HH I
_ z7 ISLAND { DIVISION OF HIGHWAYS —PLANNING AND RESEARCH BRANCH
r q 1
x I ! IN COOPERATION WITH THE
T--
. I a U.S. DEPARTMENT OF TRANSPORTATION
Iy FEDERAL HIGHWAY ADMINISTRATION
'BATTERY �` T� t / 1Fr SCALE
S NOTE: MAP INCLUDES ONLY SPATE MAINTAINED ROADS
1 ISLAND ls's5' .
!l r \ T 0 I Y 3 OR IMPORTANT NON -SYSTEM ROADS. +MILES
MILEAGE NOT SHOWN ON FRONTAGE ROADS. U _ —r�T M1EE�
_ I I�STRIKING // ✓' / �C-ykf. ROADS SHOWN AS OF JAN. I, 198S,
ISLAND: ,^!
t�/ SCALE FOR ENLARGEMENTS
ld'T
S7 r 111JL"�ARIf !r�
EMgL 1;ROUNU5 A„` BAY ` J

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PROPOSED PURCHASE = 4.45 AGRES (4.Oq U5A13LE AGRES OUTSIDE DESIGNATED WETLAND) OF
EXISTING 68.2q AGRE PARGEL. PROPOSED STORMWATER POND .35 AGRES.
PROPOSED PURGHASE PROPERTY V.- SUB -PARCEL OF PROPERTY - 2220000604
TelPOwwir
qq! TRUGTI0N --
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Total Tract Area — \
66.3 AcresMUM&IN
(co Z
4

Drainage Calculations
Carillon Assisted Living
Southport, NC
Pond Calculations
Temporary Pool Volumes
t�;ll 1191(jf�r
F
SA L.
Ii270 _
,p
hyf L./D
RECEIVED
AUG 2 5 2004
DWQ
PROJ# sw�vs
Elevation
Detention Pond
Volume CF
Forebay 1
Volume CF
Total
Volume
Rad ft
SA
Adjt SA
Tot.SA
Step
Total
Rad Ft
SA
A! �t SA
Tot.SA
Step
Total
SA
CF
I
9
40.4501
3.141593
5140
5140.282
0
19.215
3.141593
1160
1159.927
0
1 6300
0
10
43.450
3.141593
5931
-159
5772.021
5456
5456
22.215
3.141593
1550
-159
1391.396
1276
12761
7163
6732
10.1
43,750
3/141593
6013
-176
5837.205
580
6037
22.515
3,141593
1593
-176
1416,553
140
14161
7254
7453
10.2
44.050
3.141593
6096
-194
5902.455
587
6624
22,815
3,141593
1635
-194
1441,775
143
1559I
7344
8183
10.3
44,350
3.141593
6179
-212
5967,77
594
7217
23.115
3.141593
1679
-2121
1467.063
145
1704
! 74351
8922
10.31
44.380
3.141593
6188
-214
5974
60
7277
211451
3.141593
1683
-2141
1469
151
17191
7-4-44-F
8996
Permanent Pool Volumes
Elevation
Detention Pond
Volume CF
Forebay 1
Volume CF
Total
SA
Volume
CF
Rad ft
SA
[Step
Total
Rad ft
SA
Step
Total
i
9
40.500
3A41593
5153
0
19.110
3.141593
1147
01
6300
0
8
37.500
3.141593
4418
4785
4785
16.110
3.141593
815
981
9811
5233
5767
7
34.500
3,141593
37391
1631
6417
13.110
3.141593
540
678
1659
1 4279
8076
6
31.500
3,141593
31171
171
6588
10.110
3.1415931
321
431
2089
1 3438
8678
5
28.500
3.1415931
25521
2835
9423
7.110
3.1415931
1591
2401
23291
2711
11752
Check Percentages of Pool Volumes
Tem ora
Perm.
Total
Pool
Pool
Pool
Volume
Volume
Volume
CF
CF
CF
Detention Pond
7,277
9,423
16,700
Forebay No, 1
1,719
. 2,329
4,049
Total
8,996
1 11.752
20,748
Total Forebay
1,719
2,329
4,049
1
Percent Forebay
1 19.11%1
19.82%
1 19.51%
Check Percentages of Pool SA
Tem .
Perm.
Pool
Pool
SA
SA
SF
SF
Detention Pond
i 5,974
5,153
Forebay No. 1
1,469
1,147
Total
7,444
6.300
Total Forebay
1,469
1,147
Percent Foreba
19.74%
18.21%