SW8030525_HISTORICAL FILE_20090317

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

PlYA
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NCDENR
North Carolina Department of Environment and Natural Resources
Division of Water Quality
Beverly Eaves Perdue Coleen H. Sullins
Governor Director
March 17, 2009
Mr. Rick Blacher, Owner
Smith Creek Storage Facilities, Inc.
5633 Market St.
Wilmington, NC 28405
Subject: Approved Plan Revision
Smith Creek Boat Storage Phase II
Stormwater Project No. SW8 030525
New Hanover County
Dear Mr. Blacher:
Dee Freeman
Secretary
On March 6, 2009, the Wilmington Regional Office received a plan revision for
Stormwater Management Permit Number SW8 030525. The revisions include the
relocation of two catch basins. It has been determined that a formal permit modification
is not required for the proposed changes. We are forwarding you an approved copy of
the revised plans for your files. Please replace the old approved plan sheet with the
new one.
Please be aware that all terms and conditions of the permit issued on September 15,
2003 remain in full force and effect. Please also understand that the approval of this
revision to the approved plans for the subject State Stormwater Permit is done on a
case -by -case basis. Any other changes to this project must be submitted to and
approved through the Division of Water Quality prior to construction. The issuance of
this plan revision does not preclude the permittee from complying with all other
applicable statutes, rules, regulations or ordinances which may have jurisdiction over
the proposed activity, and obtaining a permit or approval prior to construction.
If you have any questions concerning this matter, please do not hesitate to call me at
[phone].
Sincerely, �- 1
David ox
Environmental Senior Specialist
GDSldwc: S:IWQSISTORMWATERIPERMIT1030525PR.mar09
cc: Charles Cazier, P.E.
New Hanover County Building Inspections
David Cox
CW.ilmington-Regional Office-- )
Central Files
Wilmington Regional office
127 Cardinal Drive Extension, Wilmington, North Carolina 28405
Phone: [phone] FAX: [phone] l Customer Service: 1-877-623-6748
Internet: www.ncrraterquality.org
NorthCarolina
;Vaturallr�
An Equal Opportunity 1 Affirmative Action Employer

Smith Creek sw8 001009 and Sw8 030525
Subject: Smith Creek sw8 001009 and Sw8 030525
From: "Charles Cazier"<[e-mail]>
Date: Thu, 5 Feb 2009 13:17:08 -0500
To: "'David W Cox"' <[e-mail]>
David,
I have been working with the owner and surveyor on the above mentioned projects. We had hoped to
have everything including drawing changes and certification of the basins ready by now. I have
provided the owner with some items to complete so that the basins can be certified. We have all
information necessary to complete the revised drawings and I will deliver them to your office in the
next few days. The pond certifications will be issued when the contractor has addressed the punch list
items and corrections for the wash down areas are complete.
The owner is disconnecting the wash down area that was within the SW8 030525 permit area. For the
SW8 001009 permit we are proposing the runoff from the wash down area be intercepted by a Oil/Grit
chamber then allowed to sheet flow across a natural area behind the basin. These adjustments will be
in the drawings provided for approval.
Thank you for your patience in this matter,
Charles Cazier
gi P3i�an`F�int R�.
? wilm.iiigtirn, NG z8409
Ghar[ie(�iniracstalengin�ring:�in gia-q"og' 3567
1 of 1 2/1 1/2009 8:41 AM

Smith Creek sw8 001009 and Sw8 030525
Subject: Smith Creek sw8 001009 and Sw8 030525
From: "Charles Cazier" <[e-mail]>
Date: Thu, 5 Feb 2009 13:17:08 -0500
To: "'David W Cox"' <[e-mail]>
David,
I have been working with the owner and surveyor on the above mentioned projects. We had hoped to
have everything including drawing changes and certification of the basins ready by now. I have
provided the owner with some items to complete so that the basins can be certified. We have all
information necessary to complete the revised drawings and I will deliver them to your office in the
next few days. The pond certifications will be issued when the contractor has addressed the punch list
items and corrections for the wash down areas are complete.
The owner is disconnecting the wash down area that was within the S W8 030525 permit area. For the
SW8 001009 permit we are proposing the runoff from the wash down area be intercepted by a Oil/Grit
chamber then allowed to sheet flow across a natural area behind the basin. These adjustments will be
in the drawings provided for approval.
Thank you for your patience in this matter,
Charles Cazier
Intracoastal
Engineermg
I1LLC
C11.1l1-l+ 11. (iric�`iir F'L
tj 1 1�01- , -P' tRi it1:.
Wilraingtan; k-284og
ClrarligC�intracaistal�ngincring:com gio-;{og=3 6 y
1 of 1 2/11/2009 8:41 AM

REC'D F E B 2 8 Z009
Intracoastal Engineering PLLC
February 12, 2008
NCDENR
Division of Water Quality
127 Cardinal Drive Extension
Wilmington, NC 28405
Attn: David Cox
Re: Smith Creek Storage
SW8 00"Hy 03 r7 SZS'
PN 100-014
Dear Mr. Cox,
In response to your November 18th inspection report we have enclosed (2) copies
of revised plans providing revised location of catch basins leading to the pond.
Previously used wash down area has been taken out of service. Roof drains have all
been rerouted to the forebay of the basin.
Please review for approval and contact us with any questions, comments or additional
information needed. Upon approval of these changes we will provide certification of the
stormwater facility.
Sincerely,
Intracoastal Engineering PLLC
Charles D. Cazier, P
�CF-
FEB 2 6 M9
gi Pelican Point Rd. Wilmington, NC 28409 [phone]

STATE OF NORTH CAROLINA
Department of Environment and Natural Resources
WIRO Regional Office
FILE ACCESS RECORD r�
SECTION SWP DATE/TIME
NAME �/��,��i'r C �2i �-�� REPRESENTING
Guidelines for Access: The staff of the Regional Office is dedicated to making public records in our
custody readily available to the public for review and copying. We also have the responsibility to the public
to safeguard these records and to carry out our day-to-day program obligations. Please read carefully the
following before signing the form.
1. Due to the large public demand for file access, we request that you call at least a day in
advance to schedule an appointment for file review so you can be accommodated.
Appointments are scheduled between 9:00 a.m. and 3:00 p.m_ Viewing time ends at 4:45
p-m. Anyone arriving without an appointment may view the files to the extent that time and
staff supervision are available.
2. You must specify files you want to review by facility name or incident number, as
appropriate. The number of files that you may review at one appointment will be limited to
five.
3. You may make copies of a file when the copier is not in use by the staff and if time permits.
There is no char_ a for 25 or less copies.: cost per copy after the initial 25 is 2.5 per copy.
Payment is to be made by check, money order, or cash in the administrative offices.
4. Files must be kept in the order you received them. Files may not be taken from the office.
No briefcases, large totes, etc. are permitted in the file review area. To remove, alter,
deface, mutilate, or destroy material in public files is a misdemeanor for which you can be
fined up to $500.00.
5. In accordance with GS 25-3-512, a $25.00 processing fee will be charged and collected for
checks on which payment has been refused.
6. The customer must present a photo ID, sign -in, and receive a visitor sticker prior to
reviewing files.
7. SITE PLAN COPIES -- If you wish to request copies of site plans, your cost is $5.00 PER
PAGE. Indicate the pages you need, and staff will have the plans made offsite as time
allows. ' /Jri L-
FACILITY NAME
1.
2.
3.
4.
5.
Signature/Name irm or Business Date
(Please attach bustbdss card to form if available)
# Copes: Amt. Pd:
COUNTY
---�1t_
Time In Time Out

Re: Smith Creek Boat Sorrage SWS 001009 and SWS 0030525
Subject: Re: Smith Creek Boat Sorrage SWS 001009 and SWS 0030525
From: David W Cox <[e-mail]>
Date: Thu, 15 Jan 2009 12:46:29 -0500
To: Charles Cazier <[e-mail]>
Hey Charlie,
I can allow you until 2/2/2009 to get that info in.David
Charles Cazier wrote:
David,
I have been working to get all the necessary old drawing files to address the
concerns of your November 18"th inspection report. It has taken until this
morning to obtain them. In my letter December 16, 2008 I optimistically stated
that the updated drawings and such would be addressed by today January 15,
2009. Since I have just received the files I am requesting another two weeks to
complete the drawings. This will give me until Monday February 2, 2009 to
address the items. I thank you for your help in this matter.
Please acknowledge that you have received this e-mail.
Have a great week,
Charles Cazier
1 of 1 1/16/2009 3:55 PM

SMITH CREEK STORAGE FACILITIES, INC.
5633 MARKET STREET
WILMINGTON, N.C. 28405
910- 791-2005
December 8, 2008
David Cox
Senior Environmental Specialist
127 Cardinal Dr.
Wilmington, NC 28405
Dear Mr. Cox,
This letter is in response to your findings at my facility November 12, 2008.
I have had all the downspouts on the building you had concerns about, redirected away
from the creels and into the drive area. Also, the rinse down area on plan sw8001009 has
been eliminated.
Charles Cazier, with Intracoastal Engineering is working on revised drawings to show
building locations and the catch basins.
Hopefully, you should receive these updated plans within the time frame you have
requested.
Sincerely,
Richard Blacher
Smith Creek Storage
5633 Market St.
Wilmington, NC 28405
2008

L h
Ji,

Intracoastal Engineering
December 16, 2008
NCDENR
Division of Water Quality
127 Cardinal Drive Extension
Wilmington, NC 28405
Attn: David Cox
Re: Smith Creek Storage
SW8 001009 and SW8 0030525
PN 100-014
Dear Mr. Cox,
In response to your November 181h inspection report we are notifying you of our
proposed actions:
1. All roof drains previously not routed to the stormwater facility have been directed
to the pond.
2. We are currently working on a design for the wash down areas to be retrofitted
with a grease trap and for the discharge to be directed appropriately. We
estimate this design to he completed and submitted for approval by January 15th
2009.
3. Updated drawings will be provided with building and inlet changes by January
151h 2009.
4. Once all these items are addressed we will provide certification of both Wet
Detention Basins.
Please review for approval and contact us with any questions, comments or additional
information needed.
Sincerely,
Intracoastal Engineering PLLC
Charles D. Cazier, .
91 Pelican Point Rd, Wilmington, NC 28409 [phone]

State Stormwater Management Systems
Permit No. SW8 030525
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES
DIVISION OF WATER QUALITY
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
Smith Creek Storage Facility, LLC
Smith Creek Bout Storage
New Hanover County
FOR THE
construction, operation and maintenance of a wet detention pond 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 Water Quality and considered a part of this
permit.
This permit shall be effective from the date of issuance until September 15, 2013, 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. The stormwater control has
been designed to handle the runoff from 72,100 square feet of impervious area.
3. The tract will be limited to the amount of built -upon area indicated on page 3 of this
permit, and per approved plans.
4. All stormwater collection and treatment systems must be located in either dedicated
common areas or recorded easements. The final plats for the project will be recorded
showing all such required easements, in accordance with the approved plans.
The runoff from all built -upon area within the permitted drainage area of this project must
be directed into the permitted stormwater control system. A permit modification must be
submitted and approved prior to the construction of additional built -upon area from
outside of the approved drainage area.
2

State Stormwater Management Systems
Permit No. SW8 030525
DIVISION OF WATER QUALITY
PROJECT DESIGN DATA SHEET
Project Name:
Permit Number:
Location:
Applicant:
Mailing Address:
Application Date:
Receiving Stream/River Basin:
Stream Index Number:
Classification of Water Body:
Drainage Area, acres:
Onsite, sq. ft.:
Offsite, sq. ft.:
Total Impervious Surfaces, sq. ft.:
Pond Depth, feet:
TSS removal efficiency:
Permanent Pool Elevation, FMSL:
Permitted Surface Area, sq. R.:
Permitted Storage Volume, cubic ft.:
Temporary Storage Elevation, FMSL
Controlling Orifice:
Permitted Forebay Volume, cubic ft.:
Smith Creek Boat Storage
SW8 030525
New Hanover County
Mr, Richard Blacher
Smith Creek Storage Facility, LLC
5633 Market Street
Wilmington, NC 28405
September 8, 2003
Smith Creek / Cape Fear
CPF 23 18-74-63
"C Sw"
3.00
130,680
none, per engineer
72,100
6.5
90% (no filter is required)
24.0
7,130@Permanent Pool
6,894
24.9
1.25 (drawdown in 2-5 days)
4,872
91

State Stormwater Management Systems
Permit No. SW8 030525
II. SCHEDULE OF COMPLIANCE
1. The stormwater management system shall be constructed in its entirety, vegetated and
operational for its intended use prior to the construction of any built -upon surface.
2. During construction, erosion shall be kept to a minimum and any eroded areas of the
system will be repaired immediately.
3. The permittee shall at all times provide the operation and maintenance necessary to assure
the permitted stormwater system functions at optimum efficiency. The approved
Operation and Maintenance Plan must be followed in its entirety and maintenance must
occur at the scheduled intervals including, but not limited to:
a. Semiannual scheduled inspections (every 6 months).
b. Sediment removal.
C. Mowing and revegetation of slopes and the vegetated filter.
d. Immediate repair of eroded areas.
C. Maintenance of all slopes in accordance with approved plans and specifications.
f. Debris removal and unclogging of outlet structure, orifice device, flow spreader,
catch basins and piping.
g. Access to the outlet structure must be available at all times.
4. Records of maintenance activities must be kept and made available upon request to
authorized personnel of DWQ. The records will indicate the date, activity, name of
person performing the work and what actions were taken.
Decorative spray fountains will not be allowed in the stormwater treatment system.
6. The facilities shall be constructed as shown on the approved plans. 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.
7. 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. Any deviations from the approved plans and specifications
must be noted on the Certification. A modification may be required for those deviations.
If the stormwater system was used as an Erosion Control device, it must be restored to
design condition prior to operation as a stormwater treatment device, and prior to
occupancy of the facility.
9. The permittee shall submit to the Director and shall have received approval for revised
plans, specifications, and calculations prior to construction, for any modification to the
approved plans, including, but not limited to, those listed below:
a. Any revision to any item shown on the approved plans, including the stonmwater
management measures, built -upon area, details, etc.
b. Project name change.
C. Transfer of ownership.
d. Redesign or addition to the approved amount of built -upon area or to the drainage
area.
C. Further subdivision, acquisition, or sale of all or part of the project area. The
project area is defined as all property owned by the permittee, for which
Sedimentation and Erosion Control Plan approval or a CAMA Major permit was
sought.
f. Filling in, altering, or piping of any vegetative conveyance shown on the approved
plan.
L,

State Stormwater Management Systems
Permit No. SW8 030525
10. The permittee shall submit final site layout and grading plans for any permitted future
areas shown on the approved plans, prior to construction. If the proposed BUA exceeds
the amount permitted under this permit, a modification to the permit must be submitted
and approved prior to construction.
11. 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.
12. At least 30 days prior to the sale or lease of any portion of the property, the permittee
shall notify DWQ and provide the name, mailing address and phone number of the
purchaser or leasee. An access/maintenance easement to the stormwater facilities shall be
granted in favor of the permittee if access to the stormwater facilities will be restricted by
the sale or lease of any portion of the property.
13. The permittee must maintain compliance with the proposed built -upon area and ensure
that the runoff from all the built -upon is directed into the permitted system.
14. 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.
15. The permittee must maintain the current permitted drainage area. No additional runoff
from outside of the permitted drainage area boundary may enter the penrnittcd stormwater
facilities without first applying for and receiving a permit modification.
III. GENERAL CONDITIONS
This permit is not transferable except after notice to and approval by the Director. In the
event of a change of owership, or a name change, the permittee must submit a formal
permit transfer request to the Division of Water Quality, accompanied by a completed
name/ownership change form, 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. The permittee is responsible
for compliance with all permit conditions until such time as the Division approves the
transfer request.
Failure to abide by the conditions and limitations contained in this permit may subject the
Permittee to enforcement action by the Division of Water Quality, in accordance with
North Carolina General Statute 143-215.6A to 143-215.6C.
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. The permittee grants DENR Staff permission to enter the property during normal business
hours for the purpose of inspecting all components of the permitted stormwater
management facility.
6. 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.

State Stormwater Management Systems
Permit No. SW8 030525
7. Unless specified elsewhere, permanent seeding requirements for the stormwater control
must follow the guidelines established in the North Carolina Erosion and Sediment
Control Planning and Design Manual.
8. Approved plans and specifications for this project are incorporated by reference and are
enforceable parts of the permit.
9. The permittee shall notify the Division any name, ownership or mailing address changes
within 30 days.
Permit issued this the 15th day of September, 2003.
NORTH CAROLINA ENVIRONMENTAL MANAGEMENT COMMISSION
Alan . Klimek, P.E., Director
Division of Water Quality
By Authority of the Environmental Management Commission
6

State Stormwater Management Systems
Permit No. SW8 030525
Smith Creek Boat Storage
Stormwater Permit No. SW8 030525
New Hanover County
Designer's Certification
as a duly registered
in the State of North Carolina, having been authorized to observe (periodically/weekly/full time)
the construction of the project,
(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.
The checklist of items on page 2 of this form is included in the Certification.
Noted deviations from approved plans and specification:
SEAL
Signature
Registration Number
Date

State Stormwater Management Systems
Permit No. SW8 030525
I1 Certification Requirements:
1. The drainage area to the system contains approximately the permitted acreage.
2. The drainage area to the system contains no more than the permitted amount of
built -upon area.
3. All the built -upon area associated with the project is graded such that the runoff
drains to the system.
4. The outlet/bypass structure elevations are per the approved plan.
5. The outlet structure is located per the approved plans.
G. Trash rack is provided on the outlet/bypass structure.
7. All slopes are grassed with permanent vegetation.
8. Vegetated slopes are no steeper than 3:1.
9. The inlets are located per the approved plans and do not cause short-circuiting of
the system.
10. The permitted amounts of surface area and/or volume have been provided.
11. Required drawdown devices are correctly sized per the approved plans.
12. All required design depths are provided.
13. All required parts of the system are provided, such as a vegetated shelf, and a
forebay.
14. The overall dimensions of the system, as shown on the approved plans, are
provided.
cc: NCDENR-DWQ Regional Office
New Hanover County Building Inspections
.

TRIPP ENGINEERING, P.C.
419 Chestnut Street
Wilmington, North Carolina 28401
Phone: [phone] - FAX: [phone]
September 5, 2003
NCDENR
Division Water Quality
127 Cardinal Drive
Wilmington, NC 28405-3845
Attn: Ms. Laurie Munn
Re: Smith Creek Boat Storage
SW8 030525
New Hanover County, NC
TE 03024
Dear Laurie:
She
In response to your correspondence dated July 2, 2003, we offer the following:
1. A highlighted map has been provided to illustrate the drainage area. A
diversion swale has been shown to relieve any off -site flows to the pond.
Crossing pipe will be the high point. Runoff will break to the Phase I and
Phase II sites at this location.
2. Note has been added.
3. Inlet Pipe has been lengthened.
4. Pond has been detailed with proposed dimensions.
5. Pond is not shown in the wetlands. Wetland line has been shown on the
highlighted plan.
Please review for approval and contact us with any questions, comments or if you
need additional information. "Thank you.
Sincerely,
Tripp Engineering, P.C.
Charles D. Cazier, E.I.
CDC:dcb
Enc.

8/29/2003
CDC
Smith Creek Boat Storage
Stormwater Calculations
03024
Total Drainage Area
s . ft.
acres
130,680
3.00
Impervious Area
Land Use
s . ft.
acres
building
28,700
0.66
asphalt
43,400
1.00
concrete
0
0.00
Total
72,100
1.66
Stormwater Calculations:
Time of Concentration
Hydraulic Length (L) = 350 ft.
hange in Height (H) = 2 ft.
Tc = (L' !H)"'O / 128
= 5.19 min.
Flow for 10 year, 6 hour Storm (Q10)
QPRE - (CPRE) x (110) x (Area)
4.73 cfs
QPosr = (CPosT) x (110) x (Area)
12.10 cfs
Detention Pond Design:
Pond Size:
Elevation
ft.
Surface Area
(sq. ft.
Normal Pool
24.00
7,130
Flood Pool
24.90
8,190
Top of Bank
27.50
11,474
Bottom of Pool
17.50
398
Total Provided Storage Volume:
Vol. _ [(Normal pool SA + Flood Pool SA) / 2]
x (F.P. elev. - N.P. elev.)
6,894 cu. ft,
% impervious = 0.552
= 55.2%
say 56.0%
CPRE _ 0.25
CPosr = (% imp.)(.95)+(1-% imp.)(.25)
= 0.64
110 = 6.30 in/hr
150 = 7.79 in/hr
Flow for 50 year, 6 Dour Storm (Q50):
QPRE - (CPRE) x (1t0) x (Area)
= 5.84 cfs
QPosT = (CPosT) x (110) x (Area)
14.96 cfs
State Surface Area Requirement at normal 000l:
Pond side slopes = 3 :1
Depth below N.P. = 6.5 ft.
SA/DA = 0.0272
(Chart for 90% TSS Removal for Wet Detention
Pond without Vegetative Filter
Required SA = (SA/DA) x (Total Drainage Area)
= 3,554 s . ft.
State Volume Requirement for Storaae of first 1" runoff:
Rv = ,05+.009(Percent Impervious)
= 0.5465565 in/in
Vol. = (Design Rainfall)(Rv)(Drainage Area)
- 5952 cu. ft.
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k-IA-7 9.8-03
03024POND
1 of 2

9/2/2003
CDC
Smith Creek Boat Storage
Stormwater Calculations
03024
Pond Volume:
Bottom SA = 398 sq. ft.
Normal Pool SA = 7,130 sq. ft.
Vol. _ [(N.P. SA + Bottom SA) / 2] x (N.P. el. - Bottom el.)
24,466 cu. ft.
Forebay:
Required Volume
Vol. = 20% of storage volume
= 4,893 cu, ft.
Provided Volume
Bottom SA= 1,041 sq. ft.
Normal Pool SA = 2,207 sq, ft.
Vol. _ [(N.P. SA + Bottom SA) / 2] x (N.P. el. - Bottom el.)
= 4,872 cu. ft.
depth = 3 ft.
Outlet Structure Design:
Flow for 2-day drawdown:
for 1st 1" of stormwater,
Q = Required Vol. / 172,800 sec. (2-days)
0.034 cfs
fired Area of Hine for 1-dav drawdown;
A= Q/[Cd xSQRT(2xgxh)]
Cd = 0.6
g = 32.2 ft./s2
h = (F. P. elev.- N.P. elev,) /2
0.45 ft.
A = 0,0107 sq. ft.
Diameter of Pioe for 2-dav drawdown:
DIA. = SQRT((A x 4) / pi] j
0.1165 ft.
1.40 in.
Use 1,25" orifice
Outlet Structure Check:
Using a 4' x 4' Basin,
Perimeter L = 16 ft.
Q = CIA
C = (% imp.)(.95) + (1-% imp.)(.25)
0.64
1 = 6,30 in. fora 10 yr. Storm
A = 3,00 Acres
12.10 cfs
Flow for 5-day drawdown:
for 1st 1" of stormwater,
Q = Required Vol. / 432,000 sec. (5-days)
0.014 cfs
Kequired Area of Hoe for 5-dav drawdown
A= Q/[Cd xSQRT(2xgxh)]
Cd = 0.6
g = 32.2 ft./s2
h = (F.P. elev. - N.P. elev.) / 2
= 0,45 ft.
A = 0.0043 sq. ft.
Diameter of Pipe for 5-day drawdown;
DIA. = SQRT[(A x 4) / pi]
= 0.0737 ft.
0.88 in.
Q= CwxLXH 1.5
H = [Q / (Cw x L)]2'3
Cw = 3
= 0.40 ft.
Peak elevation = flood pool elevation + H
= 25.30 ft.
03024 PON D
2 of 2

8/29/2003
CDC
Smith Creek Boat Storage
Stormwater Calculations
03024
Total Drainage Area
s . ft.
acres
130,680
3,00
Impervious Area
Land Use
s . ft.
acres
building
28,700
0.66
asphalt
43,400
1.00
concrete
0
0.00
Tota I
72,100
1.66
Stormwater Calculations:
Time of Concentration:
Hydraulic Length (L) = 350 ft.
hange in Height (H) = 2 ft.
Tc = (LIj /H),sas 1 128
5.19 min.
Flow for 10 year, 6 hour Storm (Q10);
QPRE _ (CPRE) X (110) x (Area)
4.73 cfs
QPosT _ (CPosT) x (110) x (Area)
= 12.10 cfs
Detention Pond Design:
Pond Size:
Elevation
ft.
Surface Area
(sq. ft.
Normal Pool
24.00
7,130
Flood Pool
24.90
8,190
Top of Bank
27.50
11,474
Bottom of Pool
17.50
398
Total Provided Storage Volume;
Vol. _ [(Normal pool SA + Flood Pool SA) / 2]
x (F.P. elev. - N.P. elev.)
6,894 cu. ft.
% impervious = 0.552
= 55.2%
say 56.0%
CPRE = 0.25
Caos-r = (% imp.)(.95)+(1-% imp.)(.25)
= 0.64
110 = 6.30 in/hr
150 = 7.79 in/hr
Flow for 50 year, 6 hour Storm (05a):
QPRE - (CPRE) x (110) x (Area)
= 5.84 cfs
QPOST = (CPOST) x (1S0) x (Area)
= 14.96 cfs
State 5urtace Area Ke uirement at normal poor
Pond side slopes = 3 A
Depth below N.P. = 6.5 ft.
SA/DA = 0.0272
(Chart for 90% TSS Removal for Wet Detention
Pond without Vegetative Filter
Required SA = (SA/DA) x (Total Drainage Area)
3,554 s . ft.
State Volume Requirement for Storage of first 1" runoff:
Rv = .05+.009(Percent Impervious)
= 0.5465565 in/in
Vol. = (Design Rainfall)(Rv)(Drainage Area)
5952 cu. ft,
��•`� �'L CpR
0.
SEAi.���9 i
ti
17374 'a
i ! •..GIN„E,� �Q ��
GREGOO N•
03024POND
1 of 2

9/2/2003
CDC
Smith Creek Boat Storage
Stormwater Calculations
03024
Pond Volume:
Bottom SA = 398 sq. ft.
Normal Pool SA= 7,130 sq. ft.
Vol, _ ((N.P SA + Bottom SA)12] x (N.P. el. - Bottom el.)
24,466 cu. ft.
Forebay:
Required Volume
Vol. = 20% of storage volume
= 4,893 cu. ft.
Provided Volume
Bottom SA= 1,041 sq. ft.
Normal Pool SA = 2,207 sq. ft.
Vol. _ [(N.P. SA + Bottom SA) / 2] x (N.P. el, - Bottom el.)
= 4,872 cu. ft.
depth = 3 ft.
Outlet Structure Design:
Flow for 2-day drawdown:
for 1st 1" of stormwater,
Q = Required Vol. 1172,800 sec. (2-days)
— 0.034 cfs
n'ULjUIICU I1iCO VI ripu iul c-uar ulemuU ii.
A= Q/ [Cd x SQRT(2 x g x h)]
Cd = 0.6
g = 32.2 ft./s2
h = (F.P. elev.- N.P, elev.) /2
= 0.45 ft.
A = 0.0107 sq. ft.
Diameter of Pipe for 2-dav drawdown
DIA. = SQRT[(A x 4) / pi]
0.1165 ft.
1.40 in.
Use 1.25" orifice
Outlet Structure Check:
Using a 4' x 4' Basin,
Perimeter L = 16 ft.
Q = CIA
C = (% imp.)(.95) + (1-% imp.)(.25)
0.64
1 = 6.30 in. for a 10 yr. Storm
A = 3.00 Acres
12.10 cfs
Flow for 5-day drawdown:
for 1st 1" of stormwater,
Q = Required Vol. / 432,000 sec. (5-days)
0.014 cfs
area Area of N1Ae for !)-aav drawdown:
A= Q/[Cd xSQRT(2xgxh)]
Cd = 0.6
g = 32.2 ft./s2
h = (F.P. elev. - N.P. elev.) / 2
— 0,45 ft.
A = 0.0043 sq. ft.
Diameter of Pipe for 5-day drawdown:
DIA. = SQRT[(A x 4) / pi]
— 0.0737 ft.
— 0.88 in.
Q= CwxLxH
H = [Q / (Cw x L)]'3
Cw = 3
0.40 ft.
Peak elevation = flood pool elevation + H
= 25.30 ft.
03024POND
2of2

-. �OF W A r��Q Michael F. Easley, Governor
William G. Ross Jr., Secretary
Division of Water Quality
Coleen H. Sullins, Deputy Director
North Carolina Department of Environment and Natural Resources
5 � Alan W. Klimek, P.>=.,Director
.�
Division of Water Quality
\5
July 2, 2003 -
Mr. Richard Blacher, Member Manager
Smith Creek Storage Facilities, LLC
5633 Market Street
Wilmington, NC 28405
Subject: REQUEST FOR ADDITIONAL INFORMATION
Stormwater Project No. SW8 030525
Smith Creek Boat Storage
New Hanover County
Dear Mr. Blacher:
The Wilmington Regional Office received a Stormwater Management Permit Application for
Smith Creek Boat Storage on May 27, 2003. A preliminary review of that information has determined
that the application is not complete. The following information is needed to continue the stormwater
review:
Please provide a drainage delineation map to include any off -site runoff. The plans
indicate that runoff from Martin Luther King Parkway may be draining on the site.
have enclosed a drawing with areas of concern.
Please provide a note on the plans that all roof drainage must be directed to the pond.
Please relocate the inlet pipe to lengthen the flow path to the outlet structure.
4. Please label and dimension the permanent pool contour.
It appears that the pond is located in the wetlands. The pond must be located outside of
the wetland boundary.-.- -- - -
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 August 2, 2003, or the application
will be returned as incomplete. The return of a project will necessitate resubmittal of all required items,
including the application fee.
If you need additional time to submit the information, please mail or fax your request for a time
extension to the Division at the address and fax number at the bottom of this letter. The request must
indicate the date by which you expect to submit the required information. The Division is allowed 90
days from the receipt of a completed application to issue the permit.
N. C. Division of Water Quality 127 Cardinal Drive Extension'. [phone] Customer Service
Wilmington Regional Office Wilmington, NC 28405 [phone] Fax [phone] DEPi.

Mr. Richard Blacher
July 2, 2003
Stormwater Project No. SW8 030525
The construction of any impervious surfaces, other than a construction entrance under an
approved Sedimentation Erosion Control Plan, is a violation of NCGS 143-215.1 and is subject to
enforcement action pursuant to NCGS 143-215.6A.
Please reference the State assigned project number on all correspondence. Any original
documents that need to be revised have been sent to the engineer or agent. All original documents must be
returned or new originals must be provided. Copies are not acceptable. If you have any questions
concerning this matter please feel free to call me at [phone].
Sincerely,
1,
Laurie Munn
Environmental Engineer
RSS/.Ism S:IWQSISTORMWATIADDINF0120031030525.july03.doc
cc: Laurie Munn
Charles Cazier

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TRIPP ENGINEERING, P.C.
4 19 Chestnut Strut
Wilmington, North Carolina 28' 4 1
Phone: [phone] FAX: O3-5631
May 27, 2003
NCDENR RECEIVED
Division Water Quality 7-2-0
� 20�a
127 Cardinal Drive
Wilmington, NC 28405-3845 BYcnn7. L Z KO
Attn: Ms. Linda Lewis C ►�- A190
Re: Smith Creek Boat Storage
New Hanover County, NC
TE 03024
Dear Linda:
Enclosed please find two (2) sets of plans, one (1) signed original and one (1)
copy of the application form with narrative, one (1) wet detention basin supplement, two
(2) sets of calculations and one check for the application fee.
Please review for approval and contact us with any questions or comments.
Thank you.
Sincerely,
Tripp Engineering, P.C.
f
Jennifer Rohde
JLR:dcb
Ene.

May 27, 2003
Stormwater Narrative
Smith Creek Boat Storage
New Hanover County, NC
TE 03024
Smith Creek' Boat Storage is a vacant 3.0 acre tract proposed as a boat storage facility.
The site is considered high density and will be treated by wet detention. The wet
detention pond is designed to treat the State's 1" and the County's 25-year pre -post
requirement. Outflow will be discharged to Smith Creek, classification C-SW.