SW8950711_HISTORICAL FILE_19951221

STORMWATER DIVISION CODING SHEET
POST -CONSTRUCTION PERMITS
PERMIT NO.
SW8 Q S 07 11
DOC TYPE
❑ CURRENT PERMIT
❑ APPROVED PLANS
HISTORICAL FILE
❑ COMPLIANCE EVALUATION INSPECTION
DOC DATE
8 12 21
YYYYMMDD

State of North Carolina F5VA
Department of Environment,
Health and Natural Resources 4�
Division of Environmental Management 111 A
James B. Hunt, Jr., Governor C A
Jonathan B. Howes, Secretary ID C i V
A. Preston Howard, Jr., P.E., Director
December 21, 1995
Mr. Mark L. Maynard
Cardinal Associates, L.L.C.
Post Office Box 5601
Wilmington, North Carolina 28403
Subject: Permit No. SW8 950711 Modification
Cardinal Trade Center
High Density Stormwater Project
New Hanover County
Dear Mr. Maynard:
The Wilmington Regional Office received the modification to the Stormwater Application for Cardinal Trade Center on
December 5, 1995, with final information on November 8, 1995. Staff review of the plans and specifications has
determined that the project, as proposed, will comply with the Stormwater Regulations set.forth in Title 15A NCAC
2H.1000. We are forwarding Permit No. SW8 950711 dated December 21, 1995, to Cardinal Associates, L.L.C.
This permit shall be effective from the date of issuance until December 5, 2005 and shall be subject to the conditions and
limitations as specified therein. Please pay special attention to the Operation and Maintenance requirements in this permit.
Failure to establish an adequate system for operation and maintenance of the stormwater management system will result
in future compliance problems.
If any parts, requirements, or limitations contained in this permit are unacceptable, you have the right to request an
ajudicatory hearing upon written request within thirty (30) days following receipt of this permit. This request must be
in the form of a written petition, conforming to Chapter 150B of the North Carolina General Statutes, and filed with the
Office of Administrative Hearings, P.O. Drawer 27447, Raleigh, NC 27611-7447. Unless such demands are made this
permit shall be final and binding.
If you have any questions, or need additional information concerning this matter, please contact Linda Lewis, or me at
[phone].
Sincerely,
1 ale,
Dave Adkins
Regional Water Quality Supervisor
DA/arl: S:\WQS\STORMWAT\PERMIT\95071LDEC
cc: Jim Honeycutt. P.E.
Alan Golden, New Hanover County Inspections
Beth Easley, New Hanover County Soil Erosion
Linda Lewis
Wilmington Regional Office
Central Files
P.O. Box 29535, Raleigh, North Carolina 27626-0535 Telephone [phone] FAX [phone]
An Equal Opportunity Affirmative Action Employer

State Stormwater Management Systems
Permit No. SW8 950711
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT, HEALTH AND NATURAL RESOURCES
DIVISION OF ENVIRONMENTAL MANAGEMENT
STATE STORMWATER MANAGEMENT PERMIT
HIGH DENSITY DEVELOPMENT
In accordance with the provisions of Article 21 of Chapter 143, General Statutes of North Carolina as amended,
and other applicable Laws, Rules, and Regulations
PERMISSION IS HEREBY GRANTED TO
Cardinal Associates, L.L. C.
Cardinal Trade Center
New Hanover County
FOR THE
construction, operation and maintenance of stormwater management systems in compliance with the provisions
of 15A NCAC 2H .1000 (hereafter referred to as the "stormwater rules') and the approved stormwater
management plans and specifications and other supporting data as attached and on file with and approved by
the Division of Environmental Management and considered a part of this permit.
This permit shall be effective from the date of issuance until December 5, 2005 and shall be subject to the
following specified conditions and limitations:
I. DESIGN STANDARDS
This permit is effective only with respect to the nature and volume of stormwater described in the
application and other supporting data.
2. This stormwater system has been approved for the management of stormwater runoff as described on
page 3 of this permit, the Project Data Sheet.
3. Approved plans and specifications for this project are incorporated by reference and are enforceable
parts of the permit.
2

State Stormwater Management Systems
Permit No. SW8 950711
DIVISION OF ENVIRONMENTAL MANAGEMENT
Project Name:
Permit Number:
Location:
Applicant:
Mailing Address:
Application Date:
Water Body Receiving Stormwater Runoff:
Classification of Water Body:
If Class SA, chloride sampling results:
Pond Depth:
Permanent Pool Elevation:
Total Impervious Surfaces Allowed:
Offsite Area entering Pond:
Green Area entering Pond:
Required Surface Area:
Provided Surface Area:
Required Storage Volume:
Provided Storage Volume:
Temporary Storage Elevation:
Controlling Orifice:
PROJECT DATA
Cardinal Trade Center
950711
New Hanover County
Mr. Mark L. Maynard
Cardinal Associates, L.L.C.
Post Office Box 5601
Wilmington, North Carolina 28403
December 5, 1995
Bradley Creek
"SC HQW"
N/A
7.0 feet
38.8 MSL
89,962 square feet
N/A square feet
13,496 square feet
3,846 square feet
3,850 square feet
7,467 cubic feet
7,509 cubic feet
40.43 MSL
1.25" pipe
Q

State Stormwater Management Systems
Permit No. SW8 950711
4. No homeowner/lot owner/developer shall be allowed to fill in, alter, or pipe any vegetative practices
(such as swales) shown on the approved plans as part of the stormwater management system without
submitting a revision to the permit and receiving approval from the Division.
5. The following items will require a modification to the permit:
a. Any revision to the approved plans, regardless of size.
b. Project name change.
C. Transfer of ownership.
d. Redesign or addition to the approved amount of built -upon area.
e. Further subdivision of the project area.
In addition, the Director may determine that other revisions to the project should require a modification
to the permit.
6. The Director may notify the permittee when the permitted site does not meet one or more of the
minimum requirements of the permit. Within the time frame specified in the notice, the permittee shall
submit a written time schedule to the Director for modifying the site to meet minimum requirements.
The permittee shall provide copies of revised plans and certification in writing to the Director that the
changes have been made.
H. SCHEDULE OF COMPLIANCE
1. The permittee will comply with the following schedule for construction and maintenance of the
stormwater management system:
a. The stormwater management system shall be constructed in it's entirety, vegetated and
operational for it's intended use prior to the construction of any built -upon surfaces except roads.
b. Daring construction, erosion shall be kept to a minimum and any eroded areas of the system will
be repaired immediately.
2. The facilities must be properly maintained and operated at all times. The approved Operation and
Maintenance Plan must be followed in it's entirety and maintenance must occur at the scheduled
intervals.
3. The permittee shall at all times provide the operation and maintenance necessary to assure the permitted
stormwater system functions at optimum efficiency including, but not limited to:
a. Semiannual scheduled inspections (every 6 months).
b. Sediment removal.
C. Mowing and revegetation of side slopes.
d. Immediate repair of eroded areas.
e. Maintenance of side slopes in accordance with approved plans and specifications.
f. Debris removal and unclogging of outlet structure, orifice device and catch basins and piping.
g. Access to the outlet structure must be available at all times.
2

State Stormwater Management Systems
Permit No. SW8 950711
4. Records of maintenance activities must be kept and made available upon request to authorized personnel
of DEM. The records will indicate the date, activity, name of person performing the work and what
actions were taken.
5. This permit shall become voidable unless the facilities are constructed in accordance with the conditions
of this permit, the approved plans and specifications, and other supporting data.
6. Upon completion of construction, prior to issuance of a Certificate of Occupancy, and prior to operation
of this permitted facility, a certification must be received from an appropriate designer for the system
installed certifying that the permitted facility has been installed in accordance with this permit, the
approved plans and specifications, and other supporting documentation. Mail the Certification to the
Wilmington Regional Office, 127 Cardinal Drive Extension, Wilmington, North Carolina, 28405,
attention Water Quality Section.
7. A copy of the approved plans and specifications shall be maintained on file by the Permittee for a
minimum of ten years from the date of the completion of construction.
III. GENERAL CONDITIONS
1. This permit is not transferable. In the event there is a desire for the facilities to change ownership, or
there is a name change of the Permittee, a formal permit request must be submitted to the Division of
Environmental Management accompanied by an application fee, documentation from the parties
involved, and other supporting materials as may be appropriate. The approval of this request will be
considered on its merits and may or may not be approved.
2. Failure to abide by the conditions and limitations contained in this permit may subject the Permittee to
enforcement action by the Division of Environmental Management, in accordance with North Carolina
General Statute 143-215.6(a) to 143-215.6(c).
3. The issuance of this permit does not preclude the Permittee from complying with any and all statutes,
rules, regulations, or ordinances which may be imposed by other government agencies (local, state, and
federal) which have jurisdiction.
4. In the event that the facilities fail to perform satisfactorily, including the creation of nuisance conditions,
the Permittee shall take immediate corrective action, including those as may be required by this
Division, such as the construction of additional or replacement stormwater management systems.
5

State Stormwater Management Systems
Permit No. SW8 950711
5. The permit may be modified, revoked and reissued or terminated for cause. The filing of a request for
a permit modification, revocation and reissuance or termination does not stay any permit condition.
Permit issued this the 21st day of December, 1995.
NORTH CAROLINA ENVIRONMENTAL MANAGEMENT COMMISSION
for A. Preston Howard, Jr., P.E., Director
Division of Environmental Management
By Authority of the Environmental Management Commission
Permit Number SW8 950711
Z

State Stormwater Management Systems
Permit No. Sw8 950711
Cardinal Trade Center
Stormwater Project No. 950711
New Hanover County
Engineer's Certification
1, , as a duly registered Professional Engineer in the State of
North Carolina, having been authorized to observe (periodically/weekly/full time) the construction of the
project,
for (Project Owner) hereby state that, to the best of my abilities, due
care and diligence was used in the observation of the project construction such that the construction was
observed to be built within substantial compliance and intent of the approved plans and specifications.
Signature
Registration Number
Date
7

DETENTION POND ANALYSIS
PROJECT #: SW8 950711
PROJECT NAME: Cardinal Trade Center
Drainage Basin: Bradley Creek
Drainage Area
IMPERVIOUS AREA
% IMPERVIOUS
FILE NAME: S:\WQS\POND\950711.WK1
REVIEWER: arl
DATE: 21—Dec-95
Class: SC HQW Chlorides: n/a
/ii. 97_ 74-4 -/11
1 UbbaU square feet
108630 square feet
Area in Acres 2.49380165 acres
Buildings
Concrete
Asphalt
TOTAL
82.82%
SURFACE AREA CALCULATION
SA/DA
Req. SA
Prov. SA
VOLUME CALCULATION
Green
Bottom
Perm. Pool
Design Pool
Design SA
Req. Volume
Prov. Volume
ORIFICE CALCULATION
Runoff Coefficient
28780 1
3665 0.95
57517 0.95
square feet
Pond Depth
3.541 %
3846.32 square feet
3850' square feet
Adjusted SA 28780
Adjusted SA 3481.75
Adjusted SA 54641.15
TOTAL 86902.9
7 TSS:
[From plan Contours]
[From plan Contours]
Avg. Head = 0.7889583 ft
Flow Q2, cfs 0.04345723 Area, in2 1.463198 Dia 2, inches
Flow Q5, cfs 0.01738289 Area, in2 0.585279 Dia 5, inches
Engineer uses 1.25 Inches Area = 1.2271846 in2
Q, cfs = 0.0364475 Drawdown = 2.3846433 days
COMMENTS
Surface Area, Volume and Orifice are within Design Guidelines.
rR

DIVISION OF ENVIRONMENTAL MANAGEMENT
NORTH CAROLINA STORMWATER MANAGEMENT PERMIT APPLICATION�p qy��}
I. GENERAL INFORMATION
I. Project Name D cA2 I1JAL -r2ApE o CrrER DEC 051995
2. Location, directions to project (include County, Address, State Road) Attach map. New H iCW0yE12 CO.
CA2DINAL. D21vE EXTENSION
3.Owner'sName CA2Dir-AL PtSSOCIATEE LLC Phone 910- 7g9-52.(P4
4.Owner's Mailing Address P• 0 • BOX S(00 1
city W I L_ al i NGTO N State N C zip X 4 0 3
5. Application date(A.gS- Fee enclosed $
6. Nearest Receiving Stream g 12AD LEY G2 EEK Class SC H Q W
7.Projectdescription OFFICE IWHSE s 2ET,+IL.
II. PERMIT INFORMATION
I. Permit No. (To befiaedinbyoear)
5Gu8
9/5071(
2. Permit Type New
Renewal
V Modification(existing Permit No.)
S U 3 q 5 011 I
3. Project Type: _Low Density
_Detention_
Infiltration Other:_ Redevelop
_General _Dir Cert
4. Other State/Federal Permits/Approvals Required (Check appropriate blanks)
CAMA Major Sedimentation/Erosion Control V 404 Permit
III. BUILT UPON AREA (Please see NCAC 211.1005 thru .1007for applicable density limits)
Drainage Drainage Breakdown of Impervious Area
Basin Basin (Please indicate below the design impervious area)
Classification SC Buildings a91 f? 90 Ss• Pr
Allowable Impervious Area 0.741acu
Total Project Area 2.49 Ctcr2,
Proposed Impervious Area a1 .0 y 04 LL
% Impervious Area
IV. STORMWATER TREATMENT (Describe how the runoff will be treated)
WET POn1D
Streets NLA
Parking/SW & 0 ) 1 R.2 Sa FT.
Totals R8i9UP, Sa.rr.
A . o4 A a.E

�i

Ik
V. DEED RESTRICTIONS AND PROTECTIVE COVENANTS
Deed restrictions and protective covenants are required to be recorded for all low density projects and all
subdivisions prior to the sale of any lot. Please see Attachment A for the specific items that must be recorded
for the type of project applied for.
By your signature below, you certify that the recorded deed restrictions and protective covenants for this project
shall include all the items required by the permit, that the covenants will be binding on all parties and persons
claiming under them, that they will run with the land, that the covenant cannot be changed or deleted without
concurrence from the State, and that they will be recorded prior to the sale of any lot.
VI. OWNER'S CERTIFICATION
VII.
tK*
1, /U#'a I.. A'4-iWAA-9 , certify that the information included on this permit
(Pleaee pint or type name clearly)
application form is correct, that the project will be constructed in conformance with the approved plans, that
the deed restrictions will be recorded with all required permit conditions, and that to the best of my knowledge,
the proposed project complies with the requirements of 15A NCAC 2H.1000.
1 authorize the below named person or firm to submit stormwater plans on my behalf.
Authorized Agent
AGENT AtMIORIZATION (MUST BE COMPLETED)
Date
Person or firm name NONENCUTT "GINemirIG cornPRNY
Mailing Address
P.o. B0X 1503(0
City WILM1N6TON
State NC Zip 2g408 Phone 910— 950-0031
Please submit application, fee, plans and calculations to the appropriate Regional Office.
Applicant/WiRO//Central Files
Office use only
STURAPIATER
DEC 0 5 1"5
D E M
l? OJ #'SWS9S0711

Drainage Calculations for Cardinal Dr. Trade Center, Wilmington, NC
Project 5042 7/20/95
Revised 11/5/95
A _ 108630 A 2.4938 acres ...total area Revised 12/4195
total 43560 total =
A paved
p
:= 56517
A = 1.297 acres ...paved area
paved
43560
A side -
3665
A = 0.084 acres ...sidewalk area
side
43560
A bidg "
28780
A bidg = 0.661 acres ...Total area of buildings
43560
A imp A paved + A side A imp = 1.382 acres - total impervious area excl. bldgs
A other A total - A imp - A bldg A other = 0.452
C pre := .20 ...pre -development C C bldg := 1.00
C imp := .95 ...paved area C
C imp C pro 1 A total) + C imp, total, + C bldg' �A total
/
C comp = 0.83 ...composite C (post -development)
L 750 ft •••hydraulic length
H := 311 ...height
3/. 385
- (128
H
T
T c = 10.71 minutes
STORWIN TER
I�uu�(UUU Do
DEC 0 5 1"S
rROJ
5W 8 _50? ( I(
...time of concentration
Intensity -Duration -Frequency Relationships:
Values of G and H*
R G H
10 252 30
50 338 33
R= Return Period
*Source: Master Drainage Plan for City of Wilmington
'" Cq /
,o�P,.. O
=� pFESSiw0
* SEAL
j 9524 >t

.,ill tort, %i oq rvA!IIlI!I1G'y'C u
kj= E56IM1asl;c
20 330
3�
LJ
j 23 ii-
O v IH
iyvii2tfi•rv���^rutp�-_ g; ir,^IJC;.!4C-!Sr1n_OPIQ
Fair ril rYV �1 �'G: ii: Cfy�;li
H
. 1
r,
120 I _
tY 2 cQWDu2;lE G .Q2[ yBAS�uD' '3L'Ii
cou-1b _ . bLG •�Sg! 11 .. r. !Wb I
/ l
yj
...
i,;
_ his b.. � „v - 'j(i :,'.—,.-'i:3ASj'Jill:.:tbi:i 1„ (,; � Ir
OS�' i0rai i,l, hlrgr �.rllcl
. i1`_.1b
;y -
ba
Cr -.`
21C!^J iti?'.�, _ V.,-
t' -
r:r a i-, _ica it r
.irriJ sme2 - 16,_i !wbGLA *rig ` b: _i rlg82
i3IO
IS'el
..L.58
— n
2iGc- _
. Wcl
a1Gb
Gci.52
2q.ems;x `1e2
-
b. r`cJ.:'sq
� �.�ti
.bUASCq = j70
9C18?.
'bSABfJ EfiS^,
�E2!A
-
. MIS! 1222c=
.v • 1 / 465
_ oiBCf 201
PIS! R Lec _ S; l8a
�F.1.1 �iLta
QLQU3CC. C!3jC'fj3'!C ? 1.;L C0Lq!L'"^_-i Jat' f t3^u yjv

T := T, Time of duration
G 10 := 252
H10:=30
:_
G 10
10
(H10rT)
G 50 := 338 H 50 := 33
G 50
150
:= (H 50 T)
Compute runoff rates:
Page 2
110 = 6.19 in/hr ...10 year stone intensity
150 = 7.733 in/hr ...50 year storm
Q pre C pre' 1 10'A total
Q pre = 3.09 cfs ...pre -development runoff from 10 yr. storm
Q 10 C comp' 110'A total
Q 10 = 12.77 cfs •.•post -development discharge rate from 10 yr. storm
Q 50 C comp' 1 50.A total
Q 50 = 15.96 cfs ...post -development discharge rate from 50 yr. storm
Volume of runoff from developed area of site:
P := 4.8 in
Soil type = Seagate
CN := 70 Curve No.
S := 1100 I - 10 S = 4.286
1111CN/(P- 0.2•S)2
R depth := P .8 S
R depth = 1.889 in. ...runoff depth
R vol R depth' (A total' 43560. 11 2
R Vol = 17103 cubic feet ...total runoff volume
T R depth' (A total 43560. 1
p 1.39•(Q 10) (-L
12) 60
T p = 16.05 ...time to peak flow

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Determine size of 7' deep pond without vegetative filter: Page 3
IMP% := A imp + A bidg IMP% = 0.819
A total
IMP% 80 := .034
IMP% g0 := .039
IMP := IMP% 80 + IMP% 90 - IMP% 80)•.19
IMP = 0.03495
DA := A total-43560
SA != (IMP)•DA
SA = 3797
Determine storage volume required for treatment of first Inch of runoff:
C Comp = 0.827
V 122.A total- 43560•C comp
V = 7491 cubic feet
Assume 110' x 35' pond. Solve for depth "d" to provide required storage:
1 := 110 w := 35 w•I = 3850
d := 1.5 ...guess value
I•w+(I+6•d)•(w+6•d)
f(d) := .d ...function of d for rectangular pond w/3:1 side
2
g(d) := V slopes
d := root((f(d) - g(d)),d)
d = 1.63 ft. - depth required to provide required storage for 1 inch
Q 2day 2.24 60.60 Q 2day = 0.0433 cis ...Max discharge for 2 day drawdown
V
Q 5day '- 5.24.60.60 Q 5day = 0.0173 cfs... Max discharge for 5 day drawdown
g := 32.2
h:=d h=0.813ft
2
A orifice _ Q 2day
Cd.(2.g.h).5
C d := .6 ...orifice coefficient
..avg. head
A orifice = 0.01 Square ft.

f �c'G :lBfEli 9'vlfE't:arge; 3uQF{?!�' bti4� �rgEt 'C fo Q•t12 9RtfiiS9}5i1
_ i33Cct
!91 d
,-''eKW.0 = ,MlI
:FTr S !`+ 7� Cia �?1 �2ii7 'i ;n9 [7ba
A 6;u
a (grvF„
aJ.0 - LSif7D^.
eeE'E'?fe be-flupei ehlveiq of "b•' tffgeb iE? ev!O?..br?!z '4C- t 'DPP SlFY."?aA
S?Ji21':;.iVriiin;m,�-ISWRM3109'Il0ibT6noI;anlJi...
r v
)iiOtiT !?
rynn -> en- u ti: -pel -,ins ! h_r, ' ps', rife` b - 7�+1 .Jw_r��' j �:+�.j..r... r S4'I: �.:C �. 1J.• •ii.•.•J � i.y ,
rival WFlb Pli 10,1 f..m G^,fjaaih x-nm... Fig: F; $,n r z �, 0i
t(nv=
(iivuS%i r'♦.-.h ,alb = iQ •. __ �+ia i7 rir ... �i:. y1 i U,tJ - n r}
l7a•oa

A orifice 5 Page 4
D := 4 12 D = 1.353 in. - for 2 day drawdown
3.14 )
Q 5day = 0.0173 cis
A orifice :_
Q 6day A orifice = 0.004 Square ft.
Cd,(2.g_h).5
5
D := 4. A orifice 12 D = 0.856 in - for 5 day drawdown
3.14
Use 1.25 inch diameter pipe in routing chart
Check capacity of emergency spillway to pass 50 year peak flow:
L := 16 ft ...Length of weir
H := 12 ft ...Driving head
C w := 3.0 ...Weir coefficient
Q := C w L• H1.5 ...Weir capacity
Q = 16.97 must be => Q 50 = 15.96 O.K.
Using a 12" barrel, check velocity at outlet:
D := 1 ft q := 4.91 ...max barrel discharge from routing sheets
m DZ
A pipe := 4 A pipe = 0.785
V outlet A q V outlet = 6.25 fps
pipe
Determine outlet apron dimensions and riprap size for discharge from pond:
From Figure 8.06.b.1 and Figure 8.06.b.2 choose Zone 1.
L a := 3• D L a = 3 ft - minimum length of apron from figure 8.06b2
W := 3• D W = 3 ft - minimum width of apron from figure 8.O6b2
dia 3 diameter of stone in inches
t := 12 thickness of apron in inches
REFER TO ATTACHED SHEETS FOR ROUTING RESULTS
Note: References to chart nos., table nos., and page nos. refer to Erosion and
Sediment Control Planning and Design Manual unless noted otherwise

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$ Z
CONTOUR INCR ACCUM
CONTOUR AREA VOL VOL STAGE In S In Z Z est
38.80
3850
0 0
0.00
0.00
39.30
4294
2036 2036
0.50
7.6187
-0.6931
0.51
39.80
4756
2263 4299
1.00
8.3660
0.0000
0.98
40.43
5364
3188 7486
1.63
8.9208
0.4886
1.59
40.80
5734
2053 9539
2.00
9.1632
0.6931
1.96
41.30
6250
2996 12535
2.50
9.4363
0.9163
2.48
41.80
6784
3259 15794
3.00
9.6674
1.0986
3.03
42.30
7336
3530 19324
3.50
9.8691
1.2528
3.61
Regression
Output:
Constant
8.38666
Ks= 4388
Std Err of Y Est
0.029838
b= 1.15
R Squared
0.998808
No. of Observations
7
XCoefficient(s)
1.1W53
Sid Err of Coef.
0.017832

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STAGE -DISCHARGE FOR RISER/BARREL SPILLWAY WITH EMERGENCY WEIR
RISER/BARREL:
7.5
Dr = 3.516 Area of grate openings
Etop = 40.43 Elev. top riser (ft)
Cwr = 3 Riser weir coefficient
Cdr = 0.59 Riser orifice coefficient
Do
=
1.25
Orifice dia.(in)
Einv
=
38.80
Elev inv. orifice (ft)
Co
=
0.6
Orifice coeff.
Db
=
1
ft.
Binv
=
38.80
Barrel invert
Cdb
=
0.6
EMERGENCY WEIR:
Cw
=
3
Weir coefficient
Ecr
=
41.00
Elev. weir crest (ft)
Lw
=
16
Weir length (ft)
1
2
3
4
5
6 7
8
Stage
Riser
Riser
Barrel
1.25"
Princ. Emerg.
Total
(weir)
(orifice)
orifice
Spillway Weir
Outflow
[ft]
[efs]
[ifs]
[cf8]
[cfs]
[cfs] Ids]
[cfsl
38.80
0.00
0.00
0.00
0.00
0.00 0.00
0.00
39.05
0.00
0.00
0.00
0.02
0.00 0.00
0.02
39.30
0.00
0.00
0.00
0.03
0.00 0.00
0.03
39.55
0.00
0.00
0.00
0.04
0.00 0.00
0.04
39.80
0.00
0.00
0.00
0.04
0.00 0.00
0.04
40.05
0.00
0.00
0.00
0.05
0.00 0.00
0.05
40.30
0.00
0.00
0.00
0.05
0.00 0.00
0.05
40.55
0.94
5.77
5.00
0.05
0.94 0.00
0.99
40.80
5.06
10.13
5.35
0.06
5.06 0.00
5.12
41.05
10.98
13.11
5.67
0.06
5.67 0.54
6.21
41.30
18.26
15.53
5.98
0.06
5.98 7.69
13.86
41.55
26.67
17.62
6.27
0.07
6.27 19.58
25.85
41.80
36.08
19.49
6.55
0.07
6.55 34.35
40.89
42.05
46.39
21.19
6.81
0.07
6.81 51.64
58.46
42.30
57.54
22.76
7.07
0.08
7.07 71.15
78.22
42.55
69.45
24.24
7.32
0.08
7.32 92.63
99.95
42.80
82.09
25.63
7.56
0.08
7.56 115.92
123.48

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COMPOSITE STAGE DISCHARGE
60
80
70
60
m 50
O
K
6
S
U
N
'p 40
30
20
10
0
r1 m o en m m n m m n m m
STAGE
1-4-R(W) tR(0) -d-BARREL -D(-ORIFICE

W, 0
io 'v: i•i 'vi ._� - is >u
BOAT;

DISCHARGE
38.8
39.3
39.8
40.3
40.8
w
O 41.3
m
41.8
j 42.3
0 42.8
m
n
y

3e^ARNO8i0
m

CHAINSAW ROUTING
Input data:
Qp= 12.77 RESULTS:
Tp= 16.1 OUTFLOW PEAK= 4.96
MAX STAGE= 40.98
dT= 1.6
Ks= 4388
b= 1.15
7.5
Etop = 40.43
Top of riser
Or = 3.516
Area of grate openings
Db= 1
Binv= 38.8
N= 1
No. of orif.
Cd= 0.6
Orifice coeff.
D= 1.25
Dia. of orifice
Zi= 38.8
Inv. elevation
Cw= 3 Weir Coefficient
L= 16 Length of overflow weir
ZCr= 41 Elev. of overflow weir

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b

1
2
3
4
5
6
7
8
TIME
INFLOW
STORAGE
STAGE
OUTFLOW
ORIFICE
WEIR
RISER/
[min]
[cts]
[cu ft]
[ft]
[cfs]
[cfs]
[cfs]
BARREL
0
0.00
0
38.8
0.00
0.000
0.00
0.00
1.6
0.31
0
38.80
0.00
0.000
0.00
0.00
3.2
1.21
30
38.81
0.00
0.000
0.00
0.00
4.8
2.62
146
38.85
0.00
0.003
0.00
0.00
6.4
4.39
397
38.92
0.01
0.011
0.00
0.00
8
6.35
817
39.03
0.02
0.017
0.00
0.00
9.6
8.32
1426
39.18
0.02
0.023
0.00
0.00
11.2
10.10
2222
39.35
0.03
0.029
0.00
0.00
12.8
11.52
3189
39.56
0.03
0.034
0.00
0.00
14.4
12.44
4292
39.78
0.04
0.040
0.00
0.00
16
12.77
5482
40.01
0.04
0.044
0.00
0.00
17.6
12.48
6704
40.24
0.05
0.048
0.00
0.00
19.2
11.59
7897
40.46
0.19
0.052
0.00
0.14
20.8
10.28
8992
40.66
2.57
0.055
0.00
2.51
22.4
9.03
9732
40.79
4.67
0.057
0.00
4.62
24
7.93
10151
40.87
4.79
0.058
0.00
4.73
25.6
6.97
10453
40.92
4.87
0.059
0.00
4.81
27.2
6.12
10654
40.96
4.92
0.060
0.00
4.86
28.8
5.38
10770
40.98
4.95
0.060
0.00
4.89
30.4
4.72
10811
40.98
4.96
0.060
0.00
4.90
32
4.15
10788
40.98
4.95
0.060
0.00
4.89
33.6
3.65
10711
40.97
4.93
0.060
0.00
4.87
35.2
3.20
10587
40.95
4.90
0.059
0.00
4.84
36.8
2.81
10424
40.92
4.86
0.059
0.00
4.80
38.4
2.47
10228
40.88
4.81
0.058
0.00
4.75
40
2.17
10004
40.84
4.75
0.058
0.00
4.69
41.6
1.91
9756
40.80
4.68
0.057
0.00
4.62
43.2
1.68
9490
40.75
4A5
0.057
0.00
4.09
44.8
1.47
9253
40.71
3.37
0.056
0.00
3.31
46.4
1.29
9071
40.68
2.80
0.055
0.00
2.75
48
1.14
8926
40.65
2.38
0.055
0.00
2.32
49.6
1.00
8806
40.63
2.05
0.055
0.00
1.99
51.2
0.88
8706
40.61
1.78
0.054
0.00
1.73
52.8
0.77
8619
40.59
1.56
0.054
0.00
1.51
54.4
0.68
8543
40.58
1.38
0.054
0.00
1.32
56
0.59
8476
40.57
1.22
0.054
0.00
1.17
57.6
0.52
8416
40.56
1.09
0.054
0.00
1.03
59.2
0.46
8361
40.55
0.97
0.053
0.00
0.92
60.8
0.40
8312
40.54
0.87
0.053
0.00
0.81
62.4
0.35
8268
40.53
0.78
0.053
0.00
0.73
64
0.31
8227
40.52
0.70
0.053
0.00
0.65
65.6
0.27
8189
40.52
0.63
0.053
0.00
0.58
67.2
0.24
8155
40.51
0.57
0.053
0.00
0.52
68.8
0.21
8123
40.51
0.52
0.053
0.00
0.46
70.4
0.19
8094
40.50
0.47
0.053
0.00
0.41
72
0.16
8067
40.49
0.42
0.053
0.00
0.37

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1
2
3
4
5
6
7
8
TIME
INFLOW
STORAGE
STAGE
OUTFLOW
ORIFICE
WEIR
RISER/
[min]
[cfs]
[cu ft]
IN
[ofs]
[cfs]
[cfs]
BARREL
73.6
0.14
8042
40.49
0.39
0.052
0.00
0.33
75.2
0.13
8019
40.49
0.35
0.052
0.00
0.30
76.8
0.11
7997
40.48
0.32
0.052
0.00
0.27
78.4
0.10
7977
40.48
0.29
0.052
0.00
0.24
80
0.09
7958
40.47
0.27
0.052
0.00
0.21
95
0.03
7794
40.45
0.09
0.052
0.00
0.04
110
0.01
7733
40.43
0.06
0.052
0.00
0.01
125
0.00
7688
40.43
0.05
0.051
0.00
0.00
140
0.00
7644
40.42
0.05
0.051
0.00
0.00
155
0.00
7598
40.41
0.05
0.051
0.00
0.00
170
0.00
7553
40.40
0.05
0.051
0.00
0.00
185
0.00
7507
40.39
0.05
0.051
0.00
0.00
200
0.00
7461
40.38
0.05
0.051
0.00
0.00
215
0.00
7415
40.38
0.05
0.051
0.00
0.00
230
0.00
7370
40.37
0.05
0.050
0.00
0.00
245
0.00
7324
40.36
0.05
0.050
0.00
0.00
260
0.00
7279
40.35
0.05
0.050
0.00
0.00
275
0.00
7234
40.34
0.05
0.050
0.00
0.00
290
0.00
7189
40.33
0.05
0.050
0.00
0.00
305
0.00
7144
40.33
0.05
0.050
0.00
0.00
320
0.00
7099
40.32
0.05
0.050
0.00
0.00
335
0.00
7054
40.31
0.05
0.050
0.00
0.00
395
0.00
6876
40.28
0.05
0.049
0.00
0.00
455
0.00
6700
40.24
0.05
0.048
0.00
0.00
515
0.00
6526
40.21
0.05
0.048
0.00
0.00
575
0.00
6354
40.18
0.05
0.047
0.00
0.00
635
0.00
6184
40.15
0.05
0.047
0.00
0.00
695
0.00
6016
40.11
0.05
0.046
0.00
0.00
755
0.00
5850
40.08
0.05
0.046
0.00
0.00
815
0.00
5686
40.05
0.04
0.045
0.00
0.00
875
0.00
5524
40.02
0.04
0.044
0.00
0.00
935
0.00
5365
39.99
0.04
0.044
0.00
0.00
995
0.00
5207
39.96
0.04
0.043
0.00
0.00
1055
0.00
5052
39.93
0.04
0.043
0.00
0.00
1115
0.00
4898
39.90
0.04
0.042
0.00
0.00
1175
0.00
4747
39.87
0.04
0.041
0.00
0.00
1235
0.00
4598
39.84
0.04
0.041
0.00
0.00
1295
0.00
4451
39.81
0.04
0.040
0.00
0.00
1355
0.00
4307
39.78
0.04
0.040
0.00
0.00
1415
0.00
4164
39.76
0.04
0.039
0.00
0.00
1475
0.00
4024
39.73
0.04
0.038
0.00
0.00
1535
0.00
3886
39.70
0.04
0.038
0.00
0.00
1595
0.00
3750
39.67
0.04
0.037
0.00
0.00
1655
0.00
3616
39.65
0.04
0.037
0.00
0.00
1715
0.00
3485
39.62
0.04
0.036
0.00
0.00
1775
0.00
3355
39.59
0.04
0.035
0.00
0.00

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5
6
7
8
TIME
INFLOW
STORAGE
STAGE
OUTFLOW
ORIFICE
WEIR
RISER/
[min]
[cfs]
[cu ft]
[ft]
Ids]
[cfs]
[ofs]
BARREL
1835
0.00
3228
39.57
0.03
0.035
0.00
0.00
1895
0.00
3103
39.54
0.03
0.034
0.00
0.00
1955
0.00
2981
39.52
0.03
0.033
0.00
0.00
2015
0.00
2861
39.49
0.03
0.033
0.00
0.00
2075
0.00
2743
39.47
0.03
0.032
0.00
0.00
2135
0.00
2627
39.44
0.03
0.031
0.00
0.00
2195
0.00
2514
39.42
0.03
0.031
0.00
0.00
2255
0.00
2403
39.39
0.03
0.030
0.00
0.00
2315
0.00
2294
39.37
0.03
0.030
0.00
0.00
2375
0.00
2188
39.35
0.03
0.029
0.00
0.00
2435
0.00
2084
39.32
0.03
0.028
0.00
0.00
2495
0.00
1982
39.30
0.03
0.028
0.00
0.00
2555
0.00
1883
39.28
0.03
0.027
0.00
0.00
2815
0.00
1707
39.26
0.03
0.026
0.00
0.00
2675
0.00
1693
39.24
0.03
0.025
0.00
0.00
2735
0.00
1601
39.22
0.02
0.025
0.00
0.00
2795
0.00
1512
39.20
0.02
0.024
0.00
0.00
2855
0.00
1425
39.18
0.02
0.023
0.00
0.00
2915
0.00
1341
39.16
0.02
0.023
0.00
0.00
2975
0.00
1259
39.14
0.02
0.022
0.00
0.00
3335
0.00
785
39.02
0.02
0.017
0.00
0.00
3695
0.00
416
38.93
0.01
0.011
0.00
0.00
4055
0.00
169
38.86
0.00
0.004
0.00
0.00
4415
0.00
82
38.83
0.00
0.002
0.00
0.00
4775
0.00
48
38.82
0.00
0.001
0.00
0.00
5135
0.00
31
38.81
0.00
0.000
0.00
0.00
5495
0.00
21
38.81
0.00
0.000
0.00
0.00
5855
0.00
15
38.81
0.00
0.000
0.00
0.00
6215
0.00
11
38.81
0.00
0.000
0.00
0.00
6575
0.00
9
38.80
0.00
0.000
0.00
0.00
6935
0.00
7
38.80
0.00
0.000
0.00
0.00
7295
0.00
6
38.80
0.00
0.000
0.00
0.00
7655
0.00
5
38.80
0.00
0.000
0.00
0.00

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State of North Carolina
Department of Environment, Health, and Natural Resources
Wilmington Regional Office
James B. Hunt, Jr. DIVISION OF ENVIRONMENTAL MANAGEMENT Jonathan B. Howes
Governor WATER QUALITY SECTION Secretary
November 22, 1995
Mr. Jim Honeycutt, P.E.
Honeycutt Engineering
Post Office Box 15036
Wilmington, North Carolina 28409
Subject: ADDITIONAL INFORMATION
Stormwater Project No. SW8 950711 Modification
Cardinal Trade Center
New Hanover County
Dear Mr. Honeycutt:
The Wilmington Regional Office received a modification to the Stormwater Management Permit
Application for Cardinal Trade Center on November 8, 1995. A preliminary review of that information
has determined that the application is not complete. The following information is needed to continue the
stormwater review:
1. Completed permit application form, enclosed.
2. The SA/DA ratio you have used did not change from the last submittal. The percent
impervious has increased, therefore, the required surface area will increase. T h e
previously permitted surface area of 3,805 square feet is insufficient to support the
impervious area increase.
3. What is the surface area at the revised storage elevation of 40.48?
127 Cardinal Drive Extension, Wilmington, N.C. 28405-3845 • Telephone [phone] • Fax [phone]
An Equal Opportunity Affimtetive Action Employer

Mr. Honeycutt
November 22, 1995
Stormwater Project No. SW8 950711 Modification
Please note that this request for additional information is in response to a preliminary review. The
requested information should be received by this Office prior to December 22, 1995, or the application
will be returned as incomplete.
If you have any questions concerning this matter please feel free to call me at [phone].
Sincerely,
Ms. Linda Lewis
Environmental Engineer
DA/arl: S:\WQS\STORMWAT\ADDINFO\950711.NOV
cc: Linda Lewis
Central Files
2