SW8060631_CURRENT PERMIT_20220726

STORMWATER DIVISION CODING SHEET
POST -CONSTRUCTION PERMITS
PERMIT NO.
SW8 O\o 1
DOC TYPE
® CURRENT PERMIT
❑ APPROVED PLANS
❑ HISTORICAL FILE
❑ COMPLIANCE EVALUATION INSPECTION
DOC DATE
-2 o2Z 0-12�0
YYYYMMDD

ROY COOPER
Governor
ELIZABETH S. BISER
Secretary
BRIAN WRENN
Director
July 26`a, 2022
JT'V Investments, LLC
Attn: Jon Vincent, Owner/Manager
1015 Ashes Dr, Suite 202
Wilmington, NC 28405
NORTH CAROLINA
Environmental Quality
Subject: Permit Renewal
Post -Construction Stormwater Management Permit No. SW8 060631
Sunnyvale Business Park
New Hanover County
Dear Mr. Vincent:
The Division of Energy, Mineral and Land Resources received a complete 8-year Permit Renewal Application for
the subject permit on June 23`d, 2022. The Division is hereby notifying you that permit SW8 060631 has been
renewed, updated, and re -issued on July 25', 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 October 19', 2028 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
OAH within thirty (30) days of receipt of this permit. You should contact the OAR 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.
This project will be kept on file at the Wilmington Regional Office. If you have any questions concerning this
permit, please contact Dylan MCPeake in the Wilmington Regional Office, at [phone] or
[e-mail].
Sincerely,
37, Brian Wrenn, Director
Division of Energy, Mineral and Land Resources
Enclosures: Attachment A — Designer's Certification Form
Attachment C — Permitting History
Renewal Application Documents
Copy of the current operation and maintenance agreement
DES/DM: \\\Stormwater\Permits & Projects\2006\060631 HD\2022 07 permit 060631
cc: Wilmington Regional Office Stormwater File
�tt North Carolina Department of Environmental Quality I Division of Energy, Mineral and land Resources
��E J/ Wilmington Regional Office 1 127 Cardinal Drive Extension I Wilmington, North Carolina 28405
910.796.7215

Post -Construction Stormwater Management
Permit No. SW8 060631
�W_111111I:11•la2IQ:ir:[N_ ZI1014I.r_1
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
JTV Investments
Sunnyvale Business Park
36021360613608 Carolina Beach Rd, 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 October 1911, 2028 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.
1. 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 in Section 1.6 on page 2 of this permit. The stormwater control has been
designed to handle the runoff from 75,511 square feet of impervious area.
3. The tract will be limited to the amount of built -upon area indicated on page 1 of this
permit, and per approved plans. There is no allotment for future built -upon area at the
site.
Page 1 of 7

Post -Construction Stormwater Management
Permit No. SW8 060631
5.
Q
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.
The following design criteria have been provided in the wet detention pond and must be
maintained at design condition:
a. Drainage Area, acres:
Onsite, ft2:
Offsite, ft2:
b. Total Impervious Surfaces, ft2:
Onsite Buildings, ft2:
Onsite Parking, ft2:
Onsite Sidewalks, ft2:
C. Design Storm, inches:
d. Pond Depth, feet:
e. TSS removal efficiency:
f. Permanent Pool Elevation, FMSL:
g. Permanent Pool Surface Area, ft2:
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
2.62
114,127
None
75,511
23,967
45,194
6,350
1.0
3.5
90%
32.5
7,781
6,155
33.29
1.0" O pipe
2,083
Barnards Creek / Cape Fear
18-80
I.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. 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.
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.
q. Access to the outlet structure must be available at all times.
Page 2 of 7

Post -Construction Stormwater Management
Permit No. SW8 060631
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.
5. 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. 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.
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.
8. During construction, erosion shall be kept to a minimum and any eroded areas of the
system will be repaired immediately.
9. 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.
10. Access to the stormwater facilities shall be maintained via appropriate easements at all
times.
Page 3 of 7

Post -Construction Stormwater Management
Permit No. SW8 060631
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
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).
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.
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.
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.
Page 4 of 7

Post -Construction Stormwater Management
Permit No. SWS 060631
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.
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 and reissued this the 261 day of July, 2022.
NORTH CAROLINA ENVIRONMENTAL MANAGEMENT COMMISSION
Brian Drector
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 060631
Attachment A
Sunnyvale Business Park
Stormwater Permit No. SW8 060631
New Hanover County
Designer's Certification
Page 1 of 2
I, , 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 060631
Page 2 of 2
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
Page 7 of 7

Attachment C - Permitting History
Sunnyvale Business Park
Permit No. SW8 060631
Approval
Date
Permit
Action
BIMS
Version
Description of the Changes
10/19/2006
Original
Approval
10
7/25/2014
Transfer
1.1
Transferred from Tr -Coast
Properties, LLC to JTV
Investemns, LLC
7/26/2022
Renewal
2.0
Expires 10/19/2028

DEMLR USE ONLY
Date R ceive
Fee Paid
Permit Number
a3
317 SD5 =
1 S W iS 0(,66,31
NC DEQ Division of Energy, Mineral and Land Resources
STATE STORMWATER:
PERMIT RENEWAL APPLICATION FORM
In accordance with 15A NCAC 2H.1045(3), 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:
SW8060631
2. Project name: Sunnyvale Business Park
3. Project street address: 3602, 3606, 3608 Carolina Beach Rd
City: Wilmington County: New Hanover
4. What, if any, changes have been made to the project as permitted?
N/A
n/a
ZIP: 28412
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: hfps://deg.nc.gov/abouUdivisions/energv-
mineral-land-resou rceslenergv-mineral-land-rules/stormwater-program/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://deg.nc.gov/abouUdivisions/energy-mineral-land-
resources/energv-rnineral-land-rules/stormwater-program/post-construction. State Stormwater Permits do not
automatically transfer with the sale of the property.
1. Current Permit Holder's Company Name/Organization:
2. Signing Official's Name: Jon Vincent
3. Signing Official's Title: Owner
4. Mailing Address: 1015 Ashes Or Suite 202
City: Wilmington
Jtv Investments
ZIP: co-rv.
5. Street Address: 1015 Ashes Dr Suite 202
City: ming on State: ZIP : 264
6. Phone:( 910. ) 208-0828 Email: [e-mail]
JUN 2 3 10V
BY:--- --- - --.
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/ORI). Only applications packages that
include all 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:
JV 1. A permit application processing fee of $505.00 payable to NCDEQ.
JV 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.
JV 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.
JV 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.
V 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).
hitD;;://www.sosnc.gov/online services/search/by title/ Business Registration
JUN 2 3 2022
BY.
Stormwater Permit Renewal Application Form Page 2 of 3 May 11, 2018

D. PERMITTEE'S CERTIFICATION
Jon Vincent , 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 1 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 pi . I agree to notify DEMLR of any problems with the SCMs
or built -upon area nd to submit the proper fo o modify or transfer the permit prior to any changes to the
project, SCMs, or nership. All informatio rovided on this permit renewal application is, to the best of my
knowledge, come d complete.
Signature: Date: JU V1Z 2-0, 2o2Z
C County of "P1.7 [j,
that ✓1
this theme.... - day of (A VU--
exae�n�(i@¢ging instrument. Witness my hand and official seal,
A
(�o'ta�Seap R y ,1 v
2 p �G
Sigat
NOVF,R
My cor rniswan'Lzpires
a Notary Public for the State of
do hereby certify
personally appeared before me
202-%, and acknowledge the due
ZY pa .
JUN 2 3 2022
Stormwater Permit Renewal Application Form Page 3 of 3 1 May 11, 2018

a
-7/-Z406- &'oY remit.,T Permit No. Shur/ 06o(e3I
9/z /I a t( ' 1 (to be provided by DWQ)
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 may be photocopied for use as an original
DWO Stormwater NlanaQement Plan Review:
A complete stormwater management plan submittal includes an application form, a wet detention basin
supplement for each basin, design calculations, and plans and specifications showing all basin and outlet
structure details.
1. PROJECT INFORMATION
Project Name:
Contact Person: ��� G✓iz'Tt "r Phone Number: 0/0 1 « s G 7 0 a
For projects with multiple basins, specify which basin this worksheet applies to:
elevations
Basin.Bottom Elevation °t q° O ft. (floor of the basin)
Permanent Pool Elevation Ste. ft. (elevation of the orifice)
Temporary Pool Elevation ft. (elevation of the discharge structure overflow)
areas
Permanent Pool Surface Area sq. ft. (water surface area at the orifice elevation)
Drainage Area cl b ac. (on -site and off -site drainage to the basin)
Impervious Area /• 3 ac. (on -site and off -site drainage to the basin)
volumes
Permanent Pool Volume /// /o cu. ft. (combined volume of main basin and forebay)
Temporary Pool Volume Ei / ems, cu. ft. (volume detained above the permanent pool)
Forebay Volume u, 02 Y cu. ft. (approximately 20% of total volume)
Other parameters
SA/DA I (surface area to drainage area ratio from DWQ table)
Diameter of Orificein. (2 to 5 day temporary pool draw -down required)
Io lq
Design Rainfall in.
Design TSS Removal 2 i 0 % (minimum 85% required)
Form SWU-102 Rev 3.99 Page I of 4

Footnotes:
When using the Division SA/DA tables, the correct SA/DA ratio for permanent pool sizing should be computed based upon the
actual impervious % and permanent 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 wet detention basin is designed to provide
90%TSS removal. The NCDENR BMP manual provides design tables for both 85% TSS removal and 90% TSS removal.
H. REQUIRED ITEMS CHECKLIST
The following checklist outlines design requirements per the Stormwater Best Management Practices Manual
(N.C. Department of Environment, Health and Natural Resources, February 1999) and Administrative Code
Section: 15 A NCAC 2H .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 a requirement has not been met, attach justification.
Applicants Initials
a.
b.
C.
d.
►� A e.
The permanent pool depth is between 3 and 6 feet (required minimum of 3 feet).
The forebay volume is approximately equal to 20% of the basin volume.
The temporary pool controls runoff from the design storm event.
The temporary pool draws down in 2 to 5 days.
If required, a 30-foot vegetative filter is provided at the outlet (include non -erosive now
calculations)
The basin length to width ratio is greater than 3:1.
The basin side slopes above the permanent pool are no steeper than 3:1. (IZAnrvw Wa-
A submerged and vegetated perimeter shelf with a slope of 6:1 or less (show detail).
Vegetative cover above the permanent pool elevation is specified.
A trash rack or similar device is provided for both the overflow and orifice.
A recorded drainage easement is provided for each basin including access to nearest right-
of-way. ( To be )
yk 1. If the basin is used for sediment and erosion control during construction, clean out of the
basin is specified prior to use as a wet detention basin.
m. A mechanism is specified which will drain the basin for maintenance or an emergency.
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) 0 does 0 does not incorporate a vegetated filter at the outlet.
This system (check one) 0 does 0 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 basin system for sediment accumulation, 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 days 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.
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 be handled in a manner that will not 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 2• 0. feet in the main pond, the sediment shall be removed.
When the permanent pool depth reads
Sediment
Bottom
El. �� • gg'
on '). Prot--
FOREBAY
2'62 feet in the forebay, the sediment shall be removed.
BASIN DIAGRAM
(fill in the blanks)
t
Permanent Pool Elevation 3 1. 50
t
Sediment Removal Elevation �Z - 8 75%
--------- ---------------A--
--o-
� Bottom Elevation �9 00 ---------1-25%
MAIN POND
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 practical.
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 namc S—n
J'e <3o2
Note: The leg ly esponslble parry should not be a homeowners association unless more than 50% of the lots have been sold and a
resident f t o subdivision has been named the president. '
1, \---A S5�)' , a Notary Public for the State of
County of do hereby certify that 1nw�
personally appeared before me this day of S\ x) t \ nd acknowledge the due
execution of the forgoing wet detention basin maintenance requirements. Witness my hand and official sea],
My commission expires Q J�CIFIV=Q.��\JJ�
Form SWU-102 Rev 3.99
Page 4 of 4
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