SW8001009_CURRENT PERMIT_20220728

STORMWATER DIVISION CODING SHEET
POST —CONSTRUCTION PERMITS
PERMIT NO.
SW8 001 0cl GI
DOC TYPE
J�U CURRENT PERMIT
❑ APPROVED PLANS
❑ HISTORICAL FILE
❑ COMPLIANCE EVALUATION INSPECTION
DOC DATE
2022012Ss
YYYYMMDD

ROY COOPER
Governor
ELIZABETH S. BISER
Secretary
BRIAN WRENN
Director
July 28, 2022
Smith Creek Storage Facilities, Inc.
Attn: Richard Blacker, President
5633 Market Street
Wilmington, NC 28405
NORTH CAROLINA
Environmental Qual ty
Subject: Permit Renewal
Post -Construction Stormwater Management Permit No. SW8 001009
Smith Creek Storage Facilities Phase I
New Hanover County
Dear Mr. Blacher.
Effective August 1, 2013 the Post -Construction Stormwater Management Program has been transferred from the
Division of Water Quality ("DWQ") to the Division of Energy, Mineral and Land Resources ("DEMLR"). All
previous references to DWQ will remain in older permits issued prior to August 1, 2013 until they are modified.
Please note that this permit will now reference DEMLR as the Division responsible for enforcement of the permit.
On August 5, 2009, the Governor signed Session Law 2009-406. This law impacted any development approval
issued by the former Division of Water Quality under Article 21 of Chapter 143 of the General Statutes, which
was current and valid at any point between January 1, 2008, and December 31, 2010. The law extended the
effective period of any permit that was set to expire during this time frame to three (3) years from its current
expiration date. On August 2, 2010, the Governor signed Session Law 20 t0-177, which granted an extra year for
a total of four (4) years extension.
The Division of Energy, Mineral and Land Resources received a complete 8-year Permit Renewal Application for
the subject permit on July 21, 2022. The Division is hereby notifying you that permit SW8001009 has been
renewed, updated, and re -issued on July 28, 2022, as attached. A copy of the current operation and maintenance
agreement is also enclosed. Please be aware that the renewal and re -issuance of this stormwater permit does not
imply that the site is currently in compliance.
This permit shall be effective until January 10, 2027, which includes all available extensions, and does not
supersede any other agency permit that may be required. The project shall be subject to the conditions and
limitations as specified therein. This permit does not impose new or increased stormwater control requirements; it
clarifies the rules and requirements of this program to provide you with a better understanding of your obligations
under this permit. Failure to comply with these requirements will result in future compliance problems. Please
note that this permit is not transferable except after notice to and approval by the Division.
If any parts, requirements, or limitations contained in this permit are unacceptable, you have the right to request
an adjudicatory hearing by filing a written petition with the Office of Administrative Hearings (OAH). The
written petition must conform to Chapter 150B of the North Carolina General Statutes and must be filed with the
OA1-I within thirty (30) days of receipt of this permit. You should contact the OAH with all questions regarding
the filing fee (if a filing fee is required) and/or the details of the filing process at 6714 Mail Service Center,
Raleigh, NC 27699-6714, or via telephone at 919-431-3000, or visit their website at www.NCOAH.com. Unless
such demands are made this permit shall be final and binding.
If you have any questions concerning this permit, please contact Ashley Smith in the Wilmington Regional
Office, at [phone] or [e-mail].
Sincerely,
.� Brian Wrenn, Director
Division of Energy, Mineral and Land Resources
D_E Q�� North Carolina Department of Environmental Qtagty I Division of Energy, Mineral and land Resources
Wilmington Regional Office 1127CardlnaIDdve Extension 1 Wilmington, North Carolma28405
Mum
910.796,7215

State Stormwater Permit No. SW8 001009
Page 2 of 2
Enclosures: Attachment A — Designer's Certification Form
Attachment C — Permitting History
Renewal Application Documents
Copy of the current operation and maintenance agreement
DES/ams: %Stormwater\Permits & Projects\2000\001009 14D\2022 07 permit 001009
cc: Wilmington Regional Office Stormwater File
erl�ftrfi Q,� North Carolina Department of Errvhonmental Quality I Division of Energy, Mineral and Land Resources
Wilmington Regional Office 1127Cardlnal Drive Extension I Wilmington. North Carolina 211405
910.796.7215

Post -Construction Stormwater Management
Permit No. SW8 001009
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENTAL QUALITY
DIVISION OF ENERGY, MINERAL AND LAND RESOURCES
POST -CONSTRUCTION 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 Facilities, Inc.
Smith Creek Storage Facility Phase 1
5633 Market Street, Wilmington, 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 as outlined in the
application, approved stormwater management plans, supplement, calculations, operation and
maintenance agreement, recorded documents, specifications, and other supporting data (the
"approved plans and specifications") as attached and/or on file with and approved by the Division of
Energy, Mineral and Land Resources (the "Division" or "DEMLR"). The project shall be constructed,
operated and maintained in accordance with these approved plans and specifications. The approved
plans and specifications are incorporated by reference and are enforceable part of this permit.
This permit shall be effective from the date of issuance until January 10, 2027 and shall be subject to
the following specified conditions and limitations. The permit issued shall continue in force and effect
until the permittee files a request with the Division for a permit modification, transfer, renewal, or
rescission; however, these actions do not stay any condition. The issuance of this permit does not
prohibit the Director from reopening and modifying the permit, revoking and reissuing the permit, or
terminating the permit for cause as allowed by the laws, rules, and regulations contained in Title 15A
NCAC 2H.1000 and NCGS 143-215.1 et.al.
I. DESIGN STANDARDS
1.' 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 in Section 1.6 on page 2 of this permit. The stormwater control has been designed to
handle the runoff from 111,929 square feet of impervious area.
3. The tract will be limited to the amount of built -upon area indicated on page 2 of this permit, and
per approved plans. The built -upon area for the future development is limited to 2,221 square
feet.
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.
5. The runoff from all built -upon area within the permitted drainage area of this project must be
directed into the permitted stormwater control system.
Page 1 of 7

Post -Construction Stormwater Management
Permit No. SW8 001009
t�
The following design criteria have been provided in the wet detention pond and must be
maintained at design condition: I
a. Drainage Area, acres:
Onsite, ftz:
Offsite, ftz:
b. Total Impervious Surfaces, ftz:
G. Design Storm, inches:
d. Pond Depth, feet:
e. TSS removal efficiency:
f. Permanent Pool Elevation, FMSL:
g. Permanent Pool Surface Area, ftz:
h. Permitted Storage Volume, ft3:
i. Temporary Storage Elevation, FMSL
j. Controlling Orifice:
k. Permitted Forebay Volume, ft3:
I. Receiving Stream/River Basin:
M. Stream Index Number:
n. Classification of Water Body:
II. SCHEDULE OF COMPLIANCE
3.64
158,449
None
111,929
1
6.5
90%
24.00
6,603
10,159
25.37
1.5"0 pipe
3,018
Spring Branch / Cape Fear
18-74-63-1
"C; Sw"
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 the design condition. 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.
e. 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.
Records of maintenance activities must be kept and made available upon request to
authorized personnel of DEMLR. The records will indicate the date, activity, name of person
performing the work and what actions were taken.
Decorative spray fountains are allowed in the pond, subject to the following criteria
a. The minimum permanent pool volume is 30,000 cubic feet.
b. The fountain must draw its water from less than 2' below the permanent pool surface.
C. Separated units, where the nozzle, pump and intake are connected by tubing, may be
used only if they draw water from the surface in the deepest part of the pond.
d. The fountain may not be placed into the forebay.
e. The falling water from the fountain must be centered in the main pond, away from the
shoreline.
f. The maximum horsepower for a fountain in this pond is 1/8 horsepower.
6. The facilities shall be constructed, operated and maintained in accordance with the provisions
of this permit, the approved plans and specifications, and the supporting documents attached
to this permit and on file with the Division.
Page 2 of 7

Post -Construction Stormwater Management
Permit No. SW8 001009
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.
8. No person or entity, including the permittee, shall alter any component shown in the approved
plans and specifications. Prior to the construction of any modification to the approved plans,
the permittee shall submit to the Director, and shall have received approval for modified plans,
specifications, and calculations including, but not limited to, those listed below. For changes to
the project or SCM that impact the certifications, a new or updated certification(s), as
applicable, will be required and a copy must be submitted to the appropriate DEQ regional
office upon completion of the modification.
a. Any modification to the approved plans and specifications, regardless of size including
the SCM(s), BUA, details, etc.
b. Redesign or addition to the approved amount of BUA or to the drainage area.
C. Further development, subdivision, acquisition, lease or sale of any, all or part of the
project and/or property area as reported in the approved plans and specifications.
d. Altering, modifying, removing, relocating, redirecting, regrading, or resizing of any
component of the approved SCM(s), the stormwater collection system and/or
vegetative conveyance shown on the approved plan.
e. The construction of any allocated future BUA.
f. The construction of any permeable pavement, #57 stone area, public trails, or
landscaping material to be considered a permeable surface that were not included in
the approved plans and specifications.
g. Other modifications as determined by the Director.
9. 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.
10. Access to the stormwater facilities shall be maintained via appropriate easements at all times.
11. 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.
III. GENERAL CONDITIONS
1. CORRECTIVE ACTIONS REQUIRED. If the facilities fail to perform satisfactorily, the
permittee shall take immediate corrective actions. This includes actions required by this
Division and the stormwater rules such as the construction of additional or replacement on -site
stormwater systems. These additional or replacement measures shall receive a permit from
the Division prior to construction.
2. PERMIT RENEWAL. A permit renewal request must be submitted at least 180 days prior to
the expiration date of this permit. The renewal request must include the appropriate
application, documentation and the processing fee as outlined in Title 15A NCAC
02H.1045(3).
3. CHANGES TO THE PROJECT NAME, PERMITTEE NAME OR CONTACT INFORMATION.
The permittee shall submit a completed Permit Information Update Application Form to the
Division within 30 days to making any one of these changes.
Page 3 of 7

Post -Construction Stormwater Management
Permit No. SW8 001009
4. TRANSFER. This permit is not transferable to any person or entity except after notice to and
approval by the Director. Neither the sale of the project and/or property, in whole or in part, nor
the conveyance of common area to a third party constitutes an approved transfer of the permit.
a. TRANSFER REQUEST. The transfer request must include the appropriate application,
documentation and the processing fee as outlined in 15A NCAC 02H.1045(2). This
request must be submitted within 90 days of the permit holder meeting one or more of
the following:
i. A natural person who is deceased;
ii. A partnership, limited liability corporation, corporation, or any other business
association that has been dissolved,
iii. A person or entity who has been lawfully and finally divested of title to the
property on which the permitted activity is occurring or will occur through
foreclosure, bankruptcy, or other legal proceeding.
iv. A person or entity who has sold the property, in whole or in part, on which the
permitted activity is occurring or will occur
V. The assignment of declarant rights to another individual or entity,
vi. The sale or conveyance of the common areas to a Homeowner's or Property
Owner's Association, subject to the requirements of NCGS 143-214.7(c2);
b. TRANSFER INSPECTION. Prior to transfer of the permit, a file review and site
inspection will be conducted by Division personnel to ensure the permit conditions
have been met and that the project and the on -site stormwater system complies with
the permit conditions. Records of maintenance activities performed to date may be
requested. Projects not in compliance with the permit will not be transferred until all
permit and/or general statute conditions are met.
5. COMPLIANCE. The permittee is responsible for compliance with the terms and conditions of
this permit until the Division approves the transfer request.
a. APPROVED PLANS AND SPECIFICATIONS. A copy of this permit, approved plans,
application, supplement, operation and maintenance agreement, all applicable
recorded documents, and specifications shall be maintained on file by the permittee at
all times.
b. DIVISION ACCESS. The permittee grants Division Staff permission to enter the
property during normal business hours to inspect all components of the permitted
project.
C. ENFORCEMENT. Any individual or entity found to be in noncompliance with the
provisions of a stormwater management permit or the requirements of the stormwater
rules is subject to enforcement procedures as set forth in NCGS 143 Article 21.
d. ANNUAL CERTIFICATION. The permittee shall electronically submit to the Division an
annual certification completed by either the permittee or their designee confirming the
projects conformance with permit conditions
e. OBTAINING COMPLIANCE. 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 modified plans and certification in writing to the Director that the
changes have been made.
Page 4 of 7

Post -Construction Stormwater Management
Permit No. SW8 001009
OTHER PERMITS. The issuance of this permit does not preclude the permittee from
complying with and obtaining any other permits or approvals that are required for this
development to take place, as required by any statutes, rules, regulations, or
ordinances, which may be imposed by any other Local, State or Federal government
agency having jurisdiction. Any activities undertaken at this site that cause a water
quality violation or undertaken prior to receipt of the necessary permits or approvals to
do so are considered violations of NCGS 143-215.1, and subject to enforcement
procedures pursuant to NCGS 143-215.6.
Permit renewed, updated and reissued this the 28th day of July 2022.
NORTH CAROLINA ENVIRONMENTAL MANAGEMENT COMMISSION
.�,,SianW Wrenn, Dire or
Division of Energy, Mineral and Land Resources
By Authority of the Environmental Management Commission
Page 5 of 7

Post -Construction Stormwater Management
Permit No. SW8 001009
Smith Creek Storage Facility Phase
Stormwater Permit No. SW8 001009
New Hanover County
Designer's Certification
Attachment A
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:
Signature
Registration Number
Date
SEAL
Page 6 of 7

Post -Construction Stormwater Management
Permit No. SW8 001009
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. All roof drains are located such that the runoff is directed into the system.
5. The outlet/bypass structure elevations are per the approved plan.
6. The outlet structure is located per the approved plans.
7. Trash rack is provided on the outlet/bypass structure.
8. All slopes are grassed with permanent vegetation.
9. Vegetated slopes are no steeper than 3:1.
10. The inlets are located per the approved plans and do not cause short-circuiting of the
system.
11. The permitted amounts of surface area and/or volume have been provided.
12. Required drawdown devices are correctly sized per the approved plans.
13. All required design depths are provided.
14. All required parts of the system are provided, such as a vegetated shelf, and a forebay.
15. The required system dimensions are provided per the approved plans.
cc: NCDEQ-DEMLR Wilmington Regional Office
New Hanover County Building Inspections
Page 7 of 7

Attachment C - Permitting History
Smith Creek Storage Facilities Phase I
Permit No. SW8 001009
Approval
Permit
BIMS
Description of the Changes
Date
Action
Version
2/13/2001
Original
1.0
Approval
one building was smaller than originally thought; business name
9/2/2003
Modification
1.1
change to Smith Creek Storage Facilities, Inc.
addition of building 3; change in the building and paved area
1/10/2005
Modification
1.2
square footage
include an additional building and wash down areas that were
Plan
not previously included on the January 10, 2005 approved plan.
5/18/2009
Revision
1.3
The future impervious allocation of 2,221 sf for this permit is
now limited to 1,324 sf.
7/28/2022
Renewal
2.0
Expires January 10, 2027

Date Received Fee Paid v L Permit Number
1. Current Permit Holder's
2. Signing Official's Name:
3. Signing Official's Title:
4. Mailing Ad ress:
City: / % / M
5. Street Address:
City: �-
6. Phone: V! l_)
NC DEQ Division of Energy, Mineral and Land Resources
STATE STORMWATER:
PERMIT RENEWAL APPLICATION FORM
In accordance with 15A NCAC 2H.1045(3j, the current permit holder shall renew their high density permit 180 days
prior to its expiration. Renewed permits are valid for a period of 8 years per Session Law 2011-398 (SB 781)
Section 60. (c). This application form is for permit renewals only.
A. PROJECT INFORMATION
1. State Stormwater Permit Number: Su��DD/op
2. Project name: J/�1//��4 Q495 /(i/�f%
3. Project streVt j dd ess:
City: 4/i��/ '/G County: IW VAb,41A
4. What, if any, changes have been made to the project as permitted? 42ON f
If the project has changed from the original approved plans, please complete SWU-101 for a Major
Modification or Minor Modification Application form available at: https://deq.nc.aov/about/divisions/energy-
inineral-land-resources/en ergy-m i neral-land-rules/stormwater-oroo ra m/post-construction.
B. PERMITTEE INFORMATION
If changes to the permittee or project name have been made, please complete either the Permit Update form
or the Permit Transfer form available at: https://deci.nc.gov/about/divisions/energy-mineral-land-resources/
energy-mineral-land-rules/stormwater-i)rooram/post-construction. State Stormwater Permits do not
automatically transfer with the sale of the property �,
l
i<=Sf/tom
ZIP
ZIP :
h
JUL 2 1 2022
Stormwater Permit Renewal Form Page 1 of 3 May 11, 2018

C. SUBMITTAL REQUIREMENTS
Submit the application package to the appropriate DEMLR Regional Office (Coastal, SA Waters) or DEMLR
Central Office (Urbanizing Areas Ph 2, USMP, Non -Coastal HQW/ORW). Only applications packages that
include pit required items listed below will be accepted and reviewed.
Initial each item below to indicate that the required information is provided in the application package:
1. A permit application processing fee of $505.00 payable to NCDEQ.
_ 2. One original signed hard copy and one electronic copy of this completed form. The signing official
named on this application to represent the current permittee must meet one of the following:
a. Corporation — a principle executive officer of at least the level of vice-president;
b. Limited Liability Company (LLC) — a manager or company official as those terms are defined
in G.S. 57D "North Carolina Limited Liability Company Act,"
c. Public Entity — a principal executive officer, ranking official, or other duly authorized employee;
d. Partnership or limited partnership — the general partner;
e. Sole proprietor; or
f. Letter of authorization signed by one of the signatories noted in a — e above authorizing the
signature of another entity.
3. One hard copy and one electronic copy of recorded documents required by the original permit that have
not yet been received by DEMLR, including: deed restrictions, protective covenants, condominium/
planned community declaration and easements. If the project has been built, include
documentation that the maximum BUA per lot or maximum total BUA has not been exceeded. If the
project has not been built, include a signed agreement that the final recorded deed restrictions and
protective covenants will be submitted at a later date.
_ 4. O&M Agreements, Please select one:
I have a copy of the current recorded O&M Agreement for all SCMs, and I will continue to keep
this on file with the permit; or
I do not have a copy of the current recorded O&M Agreement for all SCMs and am requesting a
copy be sent to me. I agree to keep this on file with the permit.
_ 5. Designer Certifications, Please select one:
A copy of the certification(s) confirming that the project was built in accordance with the
approved plans have been previously provided to the Division; or
A copy of the certification(s) confirming that the project was built in accordance with the
approved plans are enclosed; or
The project has not yet been built.
_6. [IF APPLICABLE) If the project has been built, one original hard copy and one electronic copy of a
signed, sealed, and dated letter from a licensed professional stating that the SCMs have been
inspected, and that they have been built and maintained in accordance with the permit.
_7. [IF APPLICABLE) When the permittee is a corporation or a limited liability corporation (LLC): Provide
one hard copy and one electronic copy of documentation from the NC Secretary of State, or other
official documentation, which supports the titles and positions held by the persons listed in Section
C.2 per 15A NCAC 2H. 1043(3)(b). https://wvvw.sosnc.gov/online services/search/by title/
Business Registration
Stormwater Permit Renewal Application Form Page 2 of 3 May 11, 2018

177

D. PERME',SRTIFI I�!/
I, CC��tt////�',, C/ the person legally responsible for the permit, certify that I have
a copy of the Permit and O&M Agreement on site (or I will obtain a copy and it will be kept on site), that I am
responsible for the performance of the maintenance procedures, and the site has been and will be maintained
according to the O&M Agreement and approved plans. I agree to notify DEMLR of any problems with the SCMs
or built -upon area and to submit the proper forms to modify or transfer the permit prior to any changes to the
project, SCMs, or o ggrship. All informs ion provided on this permit renewal application is, to the best of my
knowledge, corr et'd complete.
Signature: r Date:
NOTfjRIZATI�ONr ��L�DA AJ a Notary Public for the State of
W, County of QPIO 14'qJ:J hoY do hereby certify
tha 1 *rho 0ILPCH621 personally appeared before me
this the a n day of c l Liu 2022_�, and acknowledge the due
execution of the forgoing instrument. Witness my hand and official seal,
(Notary Seal)
r Notary Signature.' 2Cc Ca_ 1 CMG.
My commission expires 'O _ A091LP
Stormwater Permit Renewal Application Form Page 3 of 3 May 11, 2018

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Permit No. S( 9,66100g1t/0JD
(to be provided by DIPO)
State of North Carolina
Department of Environment and Natural Resources
Division of Water Quality
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
WET DETENTION BASIN SUPPLEMENT
This form maV he photocopied for use as an original
DWO Stormwater Management Plan Review:
A complete stormwater management plan submittal includes a wet detention basin supplement for each basin,
design calculations, plans and specifications showing all basin and outlet structure details, and a signed and
notarized operation and maintenance agreement.
PROJECT INFORMATION (please complete the following information):
Project Name: Smith Creek Storage Facilities lac
Contact Person: Richard Blacher Phone Number: [phone]
For projects with multiple basins, specify which basin this worksheet applies to: 1
ele valioris
Basin Bottom Elevation
1750 ft.
(floor oJ'ihe basin)
Permanent Pool Elevation
24.00 ft.
(elevotion of the orifice)
Temporary Pool Elevation
25.37 ft.
(elevation of the discharge struucture over loiv)
areas
Permanent Pool Surface Area 6603 sq.ft.
Ovater surface arect at the orifice elevation)
Drainage Area
3.64 ac.
(on -site noel qff--site drainage to the hcrsin)
Impervious Area
2.57 ac.
(on-sile crud off -site drainage to the basin)
Volumes
Permanent Pool Volume
14,159_
cu.ft. (conibiued volinite of tncihi hct.viti and fbrehav)
Temporary Pool Volume
10,159_
cu.ft. (vohinte deiciiliecl above the pernianeiil pooh
Forebay Volume
_3.018
cu.ft. (appro.viinciiely 2o% of toial volimie)
Oiher paramelers
SA/DAI 034 (surface area to drainage area ratio from DWO iahle)
Diameter of Orifice 1.5 in. (2 to .i day iemporciq pool clrcnv-down required)
Design Rainfall 1.0 in.
Design TSS Remova12 90 % (minininni 85% requirecO
Form SWU-102 Rer 3.99 Page I of 4

Footnotes:
I. When using the Division SAMA tables. the correct SA/DA ratio for pennanent pool sizing should be computed based upon the
actual impervious'90 and pennmteut pool depth. Linear interpolation should be employed to determine the correct value for non-
standard table entries.
2. In the 20 coastal counties. the requirement for a vegetative filter may be waived if the %vet detention basin is designed to provide
90%TSS removal. The NCDENR DMP uranual provides design tables for both 85%TSS removal and 90%TSS removal.
It. REQUIRED ITEMS CHECKLIST
The following checklist outlines design requirements per the Stonnwater Best Management Practices Manual
(N.C. Department of Environment, Health and Natural Resources, February 1999) and Administrative Code
Section: 15 A NCAC 2I-1 .1008.
Initial in the space provided to indicate the following design requirements have been met and supporting
documentation is attached. If the applicant has designated an agent in the Stormwater Management Permit
Application Form, the agent may initial below. If it requirement has not been met, attach justification.
Applicants Initials
a. The permanent pool depth is between 3 and 7 1/2 feet (required minimum of 3 feet).
b. The forebay volume is approximately equal to 20% of the total basin volume.
c. The temporary pool controls runoff from the design storm event.
d. The temporary pool draws down in 2 to 5 days.
e. If required, a 30-foot vegetative filter is provided at the outlet (include non -erosive flow
calculations).
f The basin length to width ratio is greater than 3: I.
g. The basin side slopes above the permanent pool are no steeper than 3:1.
It. A submerged and vegetated perimeter shelf with a slope of 6:1 or less (show detail).
i. Vegetative cover above the permanent pool elevation is specified.
j. A trash rack or similar device is provided for both the overflow and orifice.
k. A recorded drainage easement is provided for each basin including access to nearest right-
of-way.
1. If the basin is used for sediment and erosion control during construction, clean out of the
basin is specified to be performed prior to use as a wet detention basin
�n. A mechanism is specified which will drain the basin for maintenance or an emergency.
Portable pump.
Ill. WET DETENTION BASIN OPERATION AND MAINTENANCE AGREEMENT
The wet detention basin system is defined as the wet detention basin, pretreatment including forebays and the
vegetated filter if one is provided.
This system (check one) ❑ does X does not incorporate a vegetated filter at the outlet.
This system (check one) ❑ does X does not incorporate pretreatment other than a forebay.
Form SWU-102 Rev 3.99 Page 2 of 4

Maintenance activities shall be performed as follows:
After every significant runoff producing rainfall event and at least monthly:
a. Inspect the wet detention system for sediment accunudation, erosion, trash accumulation,
vegetated cover, and general condition.
b. Check and clear the orifice of any obstructions such that drawdown of the temporary pool occurs
within 2 to 5 clays as designed.
2. Repair eroded areas immediately, re -seed as necessary to maintain good vegetative cover, mow vegetative
cover to maintain a maximum height of six inches, and remove trash as needed.
3. Inspect and repair the collection system (i.e. catch basins, piping, swales, riprap, etc.) quarterly to
maintain proper functioning.
4. Remove accumulated sediment from the wet detention basin system semi-annually or when depth is
reduced to 75% of the original design depth (see diagram below). Removed sediment shall be disposed
of in an appropriate manner and shall not be handled in a manner that will adversely impact water quality
(i.e. stockpiling near a wet detention basin or stream, etc.).
The measuring device used to determine the sediment elevation shall be such that it will give an accurate
depth reading and not readily penetrate into accumulated sediments.
When the permanent pool depth reads _4.875_ feet in the main pond, the sediment shall be removed.
When the permanent pool depth reads 4.875_ feet in the forebay, the sediment shall be removed.
BASIN DIAGRAM
(fill in the blanks)
Permanent Pool Elevation 24.0
Sediment ftnoval El. 19.12 1 75
Sediment Removal Elevation 19.12
Bottom cvation 17.i11 . X --------------------------1-25-/�
Bottom Elevation 17.50
17OREBAY MAIN POND
5. Remove cattails and other indigenous wetland plants when they cover 50% of the basin surface. These
plants shall be encouraged to grow along the vegetated shelf and forebay berm.
6. If the basin must be drained for an emergency or to perform maintenance, the flushing of sediment
through the emergency drain shall be minimized to the maximum extent possible.
Form SWU-102 Rev 3.99 Page 3 of 4

7. All components of the wet detention basin system shall be maintained in good working order.
I acknowledge and agree by my signature below that I am responsible for the performance of the seven
maintenance procedures listed above. I agree to notify DWQ of any problems with the system or prior to any
changes to the system or responsible party.
Print name: Richard Blacher
Title: Owner
Address: 5633 Market Street, Wilmington, NC 28405
Phone
Signa
Date
Note: The legally responsible party should not be a homeowners association unless more than 501A of the lots have been sold and
❑ resident of the subdivision has been named [lie president.
0 I, 0—, I a Notary Public for the State of North Carolina
County of V , do he certify that Richard Blacher
personally appeared before me this �� day of �L ,e [, 2O0and acknowledge the due
execution of the forgoing wet detention basin maintenance requirements. Witness my hand and official seal,
LJD
y'. Y C C
SEAL
My commission expires �`���2��
Form SWU-102 Rev 3.99 Page 4 of 4

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