SW8040727_CURRENT PERMIT_20040913

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

W AT
E9QG
Michael F. Easley, Governor
Wdliam G. Ross, Jr., Secretary
North Carolina Department of Environment and Natural Resources
September 13, 2004
Ms. Judy Core -Hicks, Manager
Blue Dolphin Investments, LLC, General Partner
Driftwood Limited Partnership
c/o Integra Development Partners
4325 Lake Boone Trail, Suite.200
Raleigh, NC 27607
Subject: Stormwater Permit No. SW8 040727
Driftwood Apartments
High Density Project
New Hanover County
Dear Ms. Core -Hicks:
Alan W. Klimek, P.E. Director
Division of Water Quality
The Wilmington Regional Office received a complete Stormwater Management Permit Application for
Driftwood Apartments on September 10, 2004. Staff review of the plans and specifications has
determined that the project, as proposed, will comply with the Stormwater Regulations set forth in Title
15A NCAC 2H.1000.. We are forwarding Permit No. SW8 040727 dated September 13, 2004, for the
construction of the subject project.
This permit shall be effective from the date of issuance until September 13, 2014, and shall be subject
to the conditions andlimitations as specified therein. Please pay special attention to the Operation and
Maintenance requirements in this permit. Failure to establish an adequate system for operation and
maintenance of the stormwater management system will result in future compliance problems.
If any parts, requirerrients, or limitations contained in this permit are unacceptable, you have the right to
request an adjudicatory hearing upon written request within thirty (30) days following receipt of this
permit. This request must be in the form of a written petition, conforming to Chapter 150B of the North
Carolina General Statutes, and filed with the Office of Administrative Hearings, P.O. Drawer 27447,
Raleigh, NC 27611-7447. Unless such demands are made this permit shall be final and binding.
If you have any questions, or need additional information concerning this matter, please contact Linda
Lewis, or me at [phone].
Sincerely,
Rick Shiver ,.
Regional Supervisor
Surface Water Protection Section
RSSlarl: S:1WQSISTORMWATIPERMIT1040727,sep04
cc: David Koss, P.E., Fenner & Proffitt, Inc.
Tony Roberts, New Hanover County Building Inspections
City of,Wilmington Stormwater Services
Beth E. Wetherill, New Hanover County Engineering
Linda Lewis
Wilmington Regional Office
Central Files
North Carolina Division of Water Quality 127 Cardinal Drive Extension Phone [phone] Customer Service 1.877-623-6748
Wilmington Regional Office...._.- .. _ Wilmington, NC 28405-3845 - .. - FAX [phone] Internet: h2o.enr.slate.nc.us One
An Equal Opportunity/Affirmative Action Empbyer— 50% Recycled110% Post Consumer Paper NorthCar011na
JVatura!!�

State Stormwater Management Systems
Permit No. SW8 040727
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
Judy Core -Hicks & Blue Dolphin Investments, LLC & Driftwood Limited Partnership
Driftwood Apartments
3805 Princess Place Drive, New Hanover County
FOR THE
construction, operation and maintenance of two wet detention ponds 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 13, 2014, and
shall be subject-,#o the following specified conditions and limitations:
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 1.7 on page 3 of this permit. The wet det ntion
ponds 1 9nd 2 have been designed to handle the runoff from 31,865 Band
12,060 ft respectively, of impervious area.
3. The tract will be limited to the amount of built -upon area indicated in Section 1.7
on page 3 of this permit, and per approved plans.
4. All stormvirater 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 areas of this
project m'bst be directed into the appropriate permitted stormwater control
system.
6. Each wet pond must be operated with a 30' vegetated filter at the outlet.
Page 2 of 7

State Stormwater Management Systems
Permit No.
SW8 040727
7. The following design criteria have been provided in the wet detention ponds and
must be maintained at design condition:
Pond 1
Pond 2
a.
r
Drainage Area, acres:
1.34
0.75
Onsite, ft :
58,350
32,460
Offsite, ft2:
0
0
b.
Total Impervious Surfaces, ft2:
31,865
12,060
C.
Design Storm, inches:
1
1
d.
Pond Depth, feet:
3.5
3.0
e.
TSS removal efficiency:
85%
85%
f.
Permanent Pool Elevation, FMSL:
37.0
37.0
g..
Permanent Pool Surface Area, ft2:
3,242
1,500
h.
Permitted Storage Volume, ft3:
2,612
1,125
i.
Temporary Storage Elevation, FMSL:
37.75
37.67
j.
Controlling Orifice:
1"0 pipe
518"0 pipe
k.
Permitted Forebay Volume, ft3:
809
308
I.
Receiving Stream/River Basin:
Smith Creek 1 Cape
Fear
M.
Stream Index Number:
CPF17 18-74-63
n. Classification of Water Body: "C Sw"
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.
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.
Page 3 of 7

State Stormwater Management Systems
Permit No. SW8 040727
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.
5. Decorative spray fountains will be allowed in the stormwater treatment system,
subject to the following criteria:
a. The fountain must draw its water from less than 2' below the permanent
pool surface.
b. 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.
c. The falling water from the fountain must be centered in the pond, away
from the shoreline.
d. The maximum horsepower for a fountain in either pond is 118 horsepower.
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.
8. 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. Free access to the stormwater facilities must be provided via appropriately
maintained easements at all times.
10. 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
stormwater management measures, built -upon area, details, etc.
b. Project name change.
C. Transfer of ownership.
d. Re`'design or addition to the approved amount of built -upon area or to the
drainage area.
e. Further subdivision, acquisition, lease or sale of all or part of the project
area. The project area is defined as all property owned by the permittee,
fort 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.
11. The permittee shall submit final site layout and grading plans for any permitted
future areas shown on the approved plans, prior to construction.
12. 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.
Page 4 of 7

State Stormwater Management Systems
Permit No. SW8 040727
13. 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. This permit is not transferable except after notice to and approval by the Director.
In the event of a change of ownership, or a name change, the permittee must
submit a Jormal 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.
2. 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) having 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 arequest for a permit modification, revocation and reissuance or
termination does not stay any permit condition.
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 13th day of September, 2004.
NORTH CAROLINA ENVIRONMENTAL MANAGEMENT COMMISSION
Alan W. Klimek, P.E. Director
Division of Water Quality
• By Authority of the Environmental Management Commission
Page 5 of 7

State Stormwater Management Systems
Permit No. SW8 040727
Driftwood Apartments
Stormwater Permit No. SW8 040727
New Hanover Count
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:
Signature
Registration Number
Date
SEAL
Page 6 of 7 --- --- --� — --

State Stormwater Management Systems
Permit No. SW8 040727
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: NCDENR-DWQ Regional Office
Tony Roberts, New Hanover County Building Inspections
Page 7 of 7 -

OFFICE USE ONLY
Date Received
Fee Paid
Permit Nurnber
State of North Carolina
Department of Environment and Natural Resources
Division of Water Quality
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
This form may he photocopied for use as an original
I. GENERAL INFORMATION
1. Applicants name (specify the name of the corporation, individual, etc. who owns the project):
D41Y-fWaoto LIMire4 AAToMSAlp
2. Print Owner/Signing Official's name and title (person legally responsible for facility and compliance): L
.1y0 Co/�� . 131cits M2n2lP� qbrn�l�2�fh7�ill S i L� ()C'iJPIZ� �drT/7P�
3. Mailing Address for person listed in item 2 above:
C v loi%44A D%wgrto� ,mr e rNeR5 , 4325 LAY&Is a�Nt TIAIL. } s'vsl Zoa
L
City: JAL E t4f _.. State: 1y G Zip:__. Z I� D q
Telephone Number: ( 211 -O 1go (Ay) -
4. Project Name (subdivision, facility, or establishment name -should be consistent with project name on plans,
specifications, letters, operation and maintenance agreements, etc.):
041> fwcot7 h1AATA4fNf5
5. Location of Project (street address):
3Y,oS PA)AICCSs PL.ACe DAME
City: WILM'Air'rari _ County: 06P AfJdVEIL
6. Directions to project (from nearest major intersection):
.TA-ews To �ie/31/1lLSS5 LUKCd KAuP 1,1411f , 4o &JeML Qtocle.s, PRlAltLfss
i ON( ol-we AM Ws o alb 4t411F_ 64 Nce Jvsf sf imlelyaTtor+ WIA k%rf-f X.
7. Latitude: N �W_ 14 • b o' Longitude: YV 7-7 y — S3.54' of project
8. Contact person who can answer questions about the project:
Name: OAuo AA. kosS . P9 Telephone Number: ( 252 ) Z 3'1-4131e
II. PERMIT INFORMATION:
1. Specify whether project is (check one)
Form SWU-101 Version 3.99
L 2 sz) 237.4138 f fAx)
v New Renewal Modification
Page 1 of RECEIVED
JUL 3 0 2004
BY:

If this application is being submitted as the result of a renewal or modification to an existing permit, list the
existing permit number PIA and its issue date (if known)
3. Specify the type of project (check one):
Low Density ✓ High Density Redevelop General Permit Other
4. Additional Project Requirements (check applicable blanks):
_CAMA Major Sedimentation/Erosion Control _404/401 Permit _NPDES Stormwater
Information on required state permits can be obtained by contacting the Customer Service Center at
1-877-623-6748.
III. PROJECT INFORMATION
1. In the space provided below, summarize how stormwater will be treated. Also attach a detailed narrative
(one to two pages) describing stormwater management for the project .
ALL &Ajgff r� IMQ6V1ouS !�'RFAr On)10 0��JeLf 51ft'r (10CLV6W6j AAAwAry AAMS
�Np A cLtrSs ILL & DAZ490 To W Du-51r, WI."T NrOU '1o1J BAsWs -
2. Stormwater runoff from this project drains to the
CAN
NM-
River basin.
3. Total Project Area: 2.40 acres
4,
Project Built Upon Area:
4 Z,S %
5. How many drainage areas does the project have? 2
6. Complete the following information for each drainage area. If there are more than two drainage areas in the
project, attach an additional sheet with the information for each area provided in the same format as below.
Basin Information
Drainage Area I
Drainage Area 2
Receiving Stream Name
5MtrA r-gary—
5mgik cAaX
Receiving Stream Class
n C- 5WAMP"
1% G -5WAAP �+
Drainage Area
S g srSa 41
3 2 46o f Z
Existing Impervious' Area
O
a
Proposed Impervious"Area
31 t6 15,611
12,0 60 6f �
% Impervious' Area (total)
$4, b
37. Z
Impervious* Surface Area
Drainage Area 1
Drainage Area 2 M I C+D
On -site Buildings
3.5bo a1
8100 J 2
On -site Streets
j)A
tj)A
On -site Parking
On -site Sidewalks
►NcGug�fl�
Z330 jA4WO 4 2
Other on -site 51 GrUe{ Pdh
6 eo }2 (pASF!)
630 44-6-. m-,A)
Off -site
Total: $bs
Kf2
Total: 1 i Obi A41
* impervious area is defined as the built upon area including, but not limited to, buildings, roads, parkiry areas,
sidewalks, gravel areas, etc.
Form SWU-101 Version 3.99 Page 2 of 4

7. How was the off -site impervious area listed above derived? PI fA
IV. DEED RESTRICTIONS AND PROTECTIVE COVENANTS
The following italicized deed restrictions and protective covenants are required to be recorded for all
subdivisions, outparcels and future development prior to the sale of any lot. If lot sizes vary significantly, a table
listing each lot number, size and the allowable built -upon area for each lot must be provided as an attachment.
1. The following covenants are intended to ensure ongoing compliance with state stormwater management permit number
as issued by the Division of Water Quality. These covenants may not be
changed or deleted without the consent of the State.
2. No more than square feet of any lot shall be covered by structures or impervious materials.
Impervious materials include asphalt, gravel, concrete, brick, stone, slate or similar material but do not include wood
decking or the water surface of swimming pools.
3. Swales shall not be filled in, piped, or altered except as necessary to provide driveway crossings.
4. Built -upon area in excess of the permitted amount requires a state stormwater management permit modification prior to
construction.
5. All permitted runoff from outparcels or future development shall be directed into the permitted stormwater control
system. These connections to the stormwater control system shall he performed in a manner that maintains the integrity
and performance of the system as permitted.
By your signature below, you certify that the recorded deed restrictions and protective covenants for this project
shall include all the applicable items required above, that the covenants will be binding on all parties and persons
claiming under them, that they will run with the land, that the required covenants cannot be changed or deleted
without concurrence from the State, and that they will be recorded prior to the sale of any lot.
V. SUPPLEMENT FORMS
The applicable state stormwater management permit supplement form(s) listed below must be submitted for each
BMP specified for this project. Contact the Stormwater and General Permits Unit at [phone] for the status
and availability of these forms.
Form SWU-102
Wet Detention Basin Supplement
Form SWU-103
Infiltration Basin Supplement
Form SWU-104
Low Density Supplement
Form SWU-105
Curb Outlet System Supplement
Form SWU-106
Off -Site System Supplement
Form SWU-107
Underground Infiltration Trench Supplement
Form SWU-108
Neuse River Basin Supplement
Form SWU-109
Innovative Best Management Practice Supplement
Form SWU-101 Version 3.99 Page 3 of 4

VI. SUBMITTAL REQUIREMENTS
Only complete application packages will be accepted and reviewed by the Division of Water Quality (DWQ).
A complete package includes all of the items listed below. The complete application package should be
submitted to the appropriate DWQ Regional Office.
1. Please indicate that you have provided the following required information by initialing in the space provided
next to each item.
• Original and one copy of the Stormwater Management Permit Application Form
• One copy of the applicable Supplement Form (s) for each BMP
• Permit application processing fee of $420 (payable to NCDENR) A00 0
• Detailed narrative description of stormwater treatment/management +.�Q
• Two copies of plans and specifications, including:
- Development/Project name
- Engineer and firm
-Legend
- North arrow
- Scale
- Revision number & date
Mean high water line
Dimensioned property/project boundary
Location map with named streets or NCSR numbers
Original contours, proposed contours, spot elevations, finished floor elevations
Details of roads, drainage features, collection systems, and Stormwater control measures
- Wetlands delineated, or a note on plans that none exist
- Existing drainage (including off -site), drainage easements, pipe sizes, runoff calculations
- Drainage areas delineated
- Vegetated buffers (where required)
VII. AGENT AUTHORIZATION
If you wish to designate authority to another individual or firm so that they may provide information on your
behalf, please complete this section.
Designated agent (individual or firm):
DAVio M. bss PAW,
Mailing Address: P• o • 6ax I z6s
City: W I tS o N
Phone: ( 252 ) Z31-413b
VIII. APPLICANT'S CERTIFICATION
1, (print or type name of person listed
certify that the information in
that the project will be c ructe(
and protective cov nts will b r
NCAC 2H .100 .
Signature:
State: NC Zip: Z_1sGQ--
Fax: ( 2Sz ) V1-4US
bev�l$&
n tc 1 Information, item 2) J D ( D F2Er t�I C K S
d on this permit application form is, to the best of my knowledge, correct and
in conformance with the approved plans, that the required deed restrictions
-or4ed, and that the proposed project complies with the requirements of 15A
Fonn SWU-101 Version 3.99 Page 4 of 4
0¢

Permit No. 5WL q0 Z�
(to be provided by DWO
State of North Carolina
Department of Environment and Natural Resources
Division of Water Quality
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
WET DETENTION BASIN SUPPLEMENT
This farm may be photocopied for use as an original
DWQ_Stormwater Management 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: DAllrfWaoo APAATPtwrs
Contact Person: OAoio M. Kass P9 Phone Number: ( 252 ) 231- 4136
For projects with multiple basins, specify which basin this worksheet applies to: SA 510 ilk 1
elevations
Basin Bottom Elevation 33.50 ft. (floor of the basin)
Permanent Pool Elevation 31. eo ft. (elevation of the orifice)
Temporary Pool Elevation 3 3. 7s ft. (elevation of the discharge structure overflow)
areas
Permanent Pool Surface Area 3 Z4 2- sq. ft. (water surface area at the orifice elevation)
Drainage Area 1.34, ac. (on -site and off -site drainage to the basin)
Impervious Area _ 0.13 ac. (on -site and off -site drainage to the basin)
volumes
Permanent Pool Volume
Temporary Pool Volume
Forebay Volume
Other parameters
SA/DA 1
Diameter of Orifice
Design Rainfall
Design TSS Removal 2
31 Of. cu. ft.
Z lr 12 cu. ft.
d
d nq cu. ft.
4.13
1n.
1 in.
�S
(combined volume of main basin and forebay)
(volume detained above the permanent pool)
(approximately 20% of total volume)
(surface area to drainage area ratio from DWQ table)
(2 to 5 day temporary pool draw -down required)
(minimum 85% required)
Form 5WU-102 Rev 3.99 Page 1 of 4

Footnotes:
l 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% "fSS removal and 90% TSS removal.
11. 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. The permanent pool depth is between 3 and 6 feet (required minimum of 3 feet).
b. The forebay volume is approximately equal to 20% of the basin volume.
c. The temporary pool controls runoff from the design storm event.
e.
The temporary pool draws down& 5 days.
If required, a 30-foot vegetative filter is provided at the outlet (include non -erosive flow
calculations) �� S
The basin leng o width ratio is greater than 3.1, ( fIMA% OhJey�t-Ns)
g. The basin side slopes above the permanent pool are no steeper than 3:1.
h. 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 casement is provided for each basin including access to nearest right-
of -way.
If the basin is used for sediment and erosion control dun' , construction, clean out of the
basin is specified prior to use as a wet detention basin_ �t;S
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 (cheek one) does 0 does not incorporate a vegetated filter at the outlet.
This system (cheek one) 0 does does not incorporate pretreatment other than a forebay.
honn SWU-102 Rev 3.99 Page 2 of4

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.
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 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 34 feet in the main pond, the sediment shall be removed.
When the permanent pool depth reads Z.ZS feet in the forebay, the sediment shall be removed.
BASIN DIAGRAM
(fill in the blank )
Permanent Pool Elevation . 7• o
Sediment Re oval El -Alf 75 o
-------------- -- Sediment Removal Elevation 34-0 75%
Bottom Ele 'ation ..�%--------------------------------------------- ------
Bottom Elevation V-6 25'%
FOREBAY
MAIN POND
l MaiwfAmi 3`AAWW44 O PTO
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.
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 Pale 3 of

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 or1re nsiblc party. i
Print name: �J �0 1 � (AGe� - I.i�-L—� 1.0 t +'\I�
Tit
Address: 'If 3
A07
Lt'Q
Note: The legally responsible party should not be a homeowners association unless more than 50% of the lots have been sold and a
resident of the subdivision has been named the president.
I, V G. a Notary Public for the State o
County of ���r , do hereby certify that V—
personally appeared before me this _(0— day of ` , and acknowledge the due
execution of the forgoing wet detention basin mamtenancc re uirements. Witness my hand and official seal,
...................:....
SISAL
My cotnmission ex ires � ,
Form SWU-102 Rev 3.99 Page 4 ol'4

Permit No. sweo 4U Z7
(to be provided by DWQ)
State of North Carolina
Department of Environment and Natural Resources
Division of Water Quality
f.�lll•��ritl:7ll� : u : ► _[ ►� ► : u : ' ' �7: l�l [�7►f�L�
WET DETENTION BASIN SUPPLEMENT
This form may be photocopied for use as an original
DWO Stormwater Management 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: DRIPrWoop APAATMefuT5
Contact Person: DAvi-O At. keSs I t Phone Number: (ZS2) Z37- 413ty
For projects with multiple basins, specify which basin this worksheet applies to: OA5+N Ik2
elevations
Basin Bottom Elevation
Permanent Pool Elevation
Temporary Pool Elevation
areas
Permanent Pool Surface Area
Drainage Area
Impervious Area
volumes
Permanent Pool Volume
Temporary Pool Volume
Forebay Volume
Other parameters
SA/DA I
Diameter of Orifice
Design Rainfall
Design TSS Removal z
34 •o ft. (floor of the basin)
0 ft. (elevation of the orifice)
37_ (09 ft. (elevation of the discharge structure overflow)
!Soo
sq. ft.
(water surface area at the orifice elevation)
.'15
ac.
(on -site and off -site drainage to the basin)
, 2 o
_ ac.
(on -site and off -site drainage to the basin)
1390
cu. ft.
(combined volume of main basin and forebay)
1 129
cu. ft.
(volume detained above the permanent pool)
30$
cu. ft.
(approximately 20% of total volume)
2• 77 (surface area to drainage area ratio from DWQ table)
Sj8 in. (2 to 5 day temporary pool draw -down required)
1.0 in.
o° S % (minimum 85% required)
Form SWU-102 Rev 3.99 Page 1 of 4

Footnotes:
t 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%'I'SS removal and 90%'I'SS 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 [net, attach justification.
Applicants Initials
a. The permanent pool depth is betweer. 3 and 6 feet (tequirc-&minimum of 3 feet): - -
b. The forebay volume is approximately equal to 20% of the basin volume.
c. The temporary pool controls runoff from the design storm event.
d. The temporary pool draws down i400 5 days.
e. If required, a 30-foot vegetative filter is provided at the outlet (include non -erosive flow
calculations 65
f. The basin lcn idth ratio is greater than 3:1. (DIVD�51-1 WAL,. AUIPpJ0)
g. The basin side slopes above the permanent pool are no steeper than 3:1.
h. A submerged and vegetated perimeter shelf with a slope of 6:1 or less (show detail).`
J•
k
•
MIMI
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 casement is provided for each basin including access to nearest right-
of-way.
If the basin is used for sediment and erosion control du 7 construction, clean out of the
basin is specified prior to use as a wet detention Masi _ q�r.S
A mechanists is s
pecified which will drain the basin for aintenance or an emergency.
II1. 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 0 does not incorporate a vegetated filter at the outlet.
This system (check one) 0 does Adoes not incorporate pretreatment other than a forebay.
Donn SWU-102 Rev 3.99 Page 2 of4

Maintenance activities shall be performed as follows:
1. 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.
3. lxtspect 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 (set -diagram bel6W).Removed sediment shall be.disposcd of
in an appropriate manner and shall be handled in a manner that will riot adivers61y- impact wate;oquality (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 1 0' feet in the main pond, the sediment shall be removed.
When the permanent pool depth reads feet in the forebay, the sediment shall be removed.
BASIN DIAGRAM
(rill in the blanks)
0 Permanent Pool Elevation 3�• a a
Sediment Re oval El. 3 • is o
--- -____--:75
-- Sediment Removal Elevation 3Q•ea 75"/0
------
Bottom Elc anon .�.'Sa % ----------------------------------------------
Bottom Elevation 3�'aa 25%�
FOREBAV MAIN POND
ii-Tr: MAjoTAIN 5 LJw1lAuPA >l--6tvo IpLrA14
5. Remove cattails and other indigenous wetland plants when they cover 50% of the basin surface. These
plants steal I be encouraged to grow along the vegetated shelf and forebay berm.
G. 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-lot Rev 3.99 Page 3 of

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 1 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: �� v�06
Title: O V'�
Address: 4 3 Oo h P ��ot �t r %P Zp v / i ( /)c Z 76197
Phone: „ A �%� .0 Q /��
Signature:
Date: 7•
Note: The legally responsible party should not be a homeowners association unless more than 50% of the lots have been sold and a
resident of the st�hdivision has en named the president.
O1 S "Notary Public fo the State oaf,_. ,
County of , Ae
do hereby certify that GC L
C
personally appeared before me this f day of Z � , and acknowledge the due
execution of the forgoing wet detention basin maintenance requirements. Witness my hand and official seal,
cOt1N`��'..
S1:AI_
My commission expires��
Form SWO-102 Rev 3.99 Page 4 of 4