SW8961209_CURRENT PERMIT_20030131

STORMWATER DIVISION CODING SHEET
POST -CONSTRUCTION PERMITS
PERMIT NO.
SW
DOC TYPE
� CURRENT PERMIT
❑ APPROVED PLANS
❑ HISTORICAL FILE
❑ COMPLIANCE EVALUATION INSPECTION
DOC DATE-
�CYJ3dT 3�
YYYYMMDD

Michael F. Easley, Governor
cO
co7r
o �
Dr. J. William Eakins, Partner
Primary Care Associates
1960 South 16°i Street
Wilmington, NC 28401
Dear Dr. Eakins:
William G. Ross Jr., Secretary
North Carolina Department of Environment and Natural Resources
Alan W. Klimek, P.E.,Director
Division of Water Quality
Coleen H. Sullins, Deputy Director
Division of Water Quality
July 31, 2003
Subject: Permit No. SW8 961209 Modification
New Hanover Medical Group Satellite Office 42
High Density Stormwater Project
New Hanover County
The Wilmington Regional Office received a complete Stormwater Management Permit Application for
New Hanover Medical Group Satellite Office ##2 on July 21, 2003. Staff review of the plans and
specifications has determined that the project, as proposed, will comply with the Stormwater Regulations
set forth in Title 1 SA NCAC 2H.1000. We are forwarding Permit No. SW8 961209 Modification dated
July 31, 2003, for the construction,of New Hanover Medical Group Satellite Office 42.
This permit shall be effective from the date of issuance until July 31,'2013, and shall be subject to the
conditions and limitations as specified therein. Please pay special attention to the Operation and
Maintenance requirements in this permit. Failure to establish an adequate system for operation and
maintenance of the stormwater management system will result in future compliance problems.
If any parts, requirements, or Iimitations 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 1 S0B 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 Laurie
Munn, or me at [phone].
Sincerely, .
Rick Shiver
Water Quality Regional Supervisor
RSS/:Ism S:\WQS\STORMWAT\PERMln961209MOD.juIO3
cc: John K. Klein, P.E.
New Hanover County Building Inspections
Beth E. Wetherill, New Hanover County Engineering
Laurie Munn
Wilmington Regional Office
Central Files
XXV
N. C. Division of Water Quality 127 Cardinal Drive Extension [phone] Customer Service"
Wilmington Regional Office Wilmington, NC 28405 [phone] Fax [phone] - idCDlwe

State Stormwater Management Systems
Pen -nit No. SWS 961209 Modification
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
Primary Care Associates
New Hanover Medical Group Satellite Office #2
New Hanover County
FOR THE
construction, operation and maintenance of a wet detention pond in compliance with the
provisions of 15A NCAC 2H A 000 (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 July 31, 2013, and shall be subject
to the following specified conditions and limitations:
I. DESIGN STANDARDS
This permit is effective only with respect to the nature and volume of stormwater
described in the application and other supporting data.
2. This stormwater system has been approved for the management of stormwater runoff as
described on page 3 of this permit, the Project Data Sheet. The stormwater control has
been designed to handle the runoff from 86,909 square feet of impervious area.
The tract will be limited to the amount of built -upon area indicated on page 3 of this
permit, and per approved plans.
4. All stormwater collection and treatment systems must be located in either dedicated
common areas or recorded easements. The final plats for the project will be recorded
showing all such required easements, in accordance with the approved plans.
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. A permit modification must be
submitted and approved prior to the construction of additional built -upon area from
outside of the approved drainage area.
2

State Stormwater Management Systems
Permit No. SW8 961209 Modification
DIVISION OF WATER QUALITY
PROJECT DESIGN DATA SHEET
Project Name:
Permit Number:
Location:
Applicant:
Mailing Address:
Application Date:
Receiving Stream/River Basin:
Stream Index Number:
Classification of Water Body:
Drainage Area, acres:
Onsite, sq. ft.:
Offsite, sq. ft.:
Total Impervious Surfaces, sq. ft.:
Pond Depth, feet:
TSS removal efficiency:
Permanent Pool Elevation, FMSL:
Permitted Surface Area, sq. ft..
Permitted Storage Volume, cubic ft.
Temporary Storage Elevation, FMSL:
Controlling Orifice:
Permitted Forebay Volume, cubic ft.:
New Hanover Medical Group Satellite Office #2
SW8 961209 Modification
New Hanover County
Dr. J William Eakins
Primary Care Associates
1960 South 160' Street
Wilmington, NC 28401
July 21, 2003
Mott Creek 1 Cape Fear
CPF 17 18-82
"C Sw"
3.69
160,612
none, per engineer
86,909
4.0
90% (no filter is required)
22.5
8,388 @ Permanent Pool
7,889
23.5
1.625" � (drawdown in 2-5 days)
7,472
3

State Stormwater Management Systems o,.—
Permit No. SW8 961209 Modification
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.
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.
S. Decorative spray fountains will not be allowed in the stormwater treatment system.
6. The facilities shall be constructed as shown on the approved plans. This permit shall
become voidable unless the facilities are constructed in accordance with the conditions of
this permit, the approved plans and specifications, and other supporting data.
7. Upon completion of construction, prior to issuance of a Certificate of Occupancy, and
prior to operation of this permitted facility, a certification must be received from an
appropriate designer for the system installed certifying that the permitted facility has been
installed in accordance with this permit, the approved plans and specifications, and other
supporting documentation. Any deviations from the approved plans and specifications
must be noted on the Certification. A modification may be required for those deviations.
If the stormwater system was used as an Erosion Control device, it must be restored to
design condition prior to operation as a stormwater treatment device, and prior to
occupancy of the facility.
9. The permittee shall submit to the Director and shall have received approval for revised
plans, specifications, and calculations prior to construction, for any modification to the
approved plans, including, but not limited to, those listed below:
a. Any revision to any item shown on the approved plans, including the stormwater
management measures, built -upon area, details, etc.
b. Project name change.
C. Transfer of ownership.
d. Redesign or addition to the approved amount of built -upon area or to the drainage
area.
e. Further subdivision, acquisition, or sale of all or part of the project area. The
project area is defined as all property owned by the permittee, for which
Sedimentation and Erosion Control Plan approval or a CAMA Major permit was
sought.
f. Filling in, altering, or piping of any vegetative conveyance shown on the approved
plan.
4

State Stormwater Management Systems
_Ail Permit No. SW8 961209 Modification
10. The perrtiince shall submit final site layout and grading plans for any permitted future
areas shorn on the approved plans, prior to construction. If the proposed BUA exceeds
the amount permitted under this permit, a modification to the permit must be submitted
and approved prior to construction.
11. A copy of the approved plans and specifications shall be maintained on file by the
Permittee for a minimum of ten years from the date of the completion of construction.
12. At least 30 days prior to the sale or lease of any portion of the property, the permittee
shall notify DWQ and provide the name, mailing address and phone number of the
purchaser or leasee. An access/maintenance easement to the stormwater facilities shall be
granted in favor of the permittee if access to the stormwater facilities will be restricted by
the sale or lease of any portion of the property.
13. The permittee must maintain compliance with the proposed built -upon area and ensure
that the runoff from all the built -upon is directed into the permitted system.
14. The Director may notify the permittee when the permitted site does not meet one or more
of the minimum requirements of the permit. Within the time frame specified in the notice,
the permittee shall submit a written time schedule to the Director for modifying the site to
meet minimum requirements. The permittee shall provide copies of revised plans and '
certification in writing to the Director that the changes have been made.
15. The permittee must maintain the current permitted drainage area. No additional runoff
from outside of the permitted drainage area boundary may enter the permitted stormwater
facilities without first applying for and receiving a permit modification.
III. GENERAL CONDITIONS
This permit is not transferable except after notice to and approval by the Director. In the
event of a change of owership, or a name change, the permittee must submit a formal
permit transfer request to the Division of Water Quality, accompanied by a completed
name/ownership change form, documentation from the parties involved, and other
supporting materials as may be appropriate. The approval of this request will be
considered on its merits and may or may not be approved. The permittee is responsible
for compliance with all permit conditions until such time as the Division approves the
transfer request.
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) which have jurisdiction.
4. In the event that the facilities fail to perform satisfactorily, including the creation of
nuisance conditions, the Permittee shall take immediate corrective action, including those
as may be required by this Division, such as the construction of additional or replacement
stormwater management systems.
The permittee grants DENR Staff permission to enter the property during normal business
hours for the purpose of inspecting all components of the permitted stormwater
management facility.
6. The permit may be modified, revoked and reissued or terminated for cause. The filing of
a request for a permit modification, revocation and reissuance or termination does not
stay any permit condition.
5

State Stormwater Management Systems_,
Permit No. SW8 961209 Modification
7. Unless specified else,.vhere, 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 31 st day of July, 2003,
NORTH CAROLINA ENVIRONMENTAL MANAGEMENT COMMISSION
Alan W. Klimek, P.E., Director
Division of Water Quality
By Authority of the Environmental Management Commission
Cel

State Stormwater Management Systems
Permit No. SW8 961209 Modification
New Hanover Medical Group Satellite Office #2
Stormwater Permit No. SW8 961209 Modification
New Hanover County
Designer's Certification
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:
Si gnature
Registration Number
Date
SEAL
7

State Stormwater Management Systems �4
Permit No. SW8 961209 Modification
Certification Requirements:
1. The drainage area to the system contains approximately the permitted acreage
2. The drainage area to the system contains no more than the permitted amount of
built -upon area.
3. All the built -upon area associated with the project is graded such that the runoff
drains to the system.
4. The outletibypass structure elevations are per the approved plan.
S. The outlet structure is located per the approved plans.
6. Trash rack is provided on the outlet/bypass structure.
7. All slopes are grassed with permanent vegetation.
8. Vegetated slopes are no steeper than 3:1.
9. The inlets are located per the approved plans and do not cause short-circuiting of
the system.
10. The permitted amounts of surface area and/or volume have been provided.
11, Required drawdown devices are correctly sized per the approved plans.
12. All required design depths are provided.
13. AlI required parts of the system are provided, such as a vegetated shelf, and a
forebay.
14. The overall dimensions of the system, as shown on the approved plans, are
provided.
cc: NCDENR-DWQ Regional Office
New Hanover County Building Inspections
E.1

RECEIVE
KLEIN ENGINEERING DEC2 $1998 322 South 4th Street
r Wilmington, NC 28401
AND ASSOCIATES BY: J [phone]
December 23, 1998
Ms. Linda Lewis
NCDENR, DWQ
127 Cardinal Drive Extension
Wilmington, NC 28405-3845
Re: Satellite Office for New Hanover Medical Group
Monkey Junction, New Hanover County
Stormwater Project No.: SW8 961209 Modification
Engineer's Certification
Dear Ms. Lewis:
File No.: 97019
Please find enclosed Certification for the above referenced project. Should there be any questions
concerning the Certification or the project in general, please feel free to contact our office (new
phone number 799-7967).
Sincerely,
KLEIN ENGINEERING AND ASSOCIATES
HN K. KLEIN, PE
enclosures
cc: Ms. Jo Wilkens

wo-111mg Oxwywvlazronfflwmaw
New Hanover Medical Group Satellite Office #2
Stormwater Permit No. SW8 961209 Modification
New Hanover County
1,
Engineer's Certification
I, 3 VV} �. s a duly registered Professional Engineer in the State of North
Carolina, having been authorized to observe ttD
week4yifitH-fim) the construction of the project,
tJe,_3 d.., o"oe mrtmo t.. G •J;r,, 'S AT 6�t.�'t E OFF: k-c AA. Z _ (Project)
for Fqk%yAAg:j Cores %,%c�e_rATES (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.
Noted deviations from approved plans and specification:
1­I`�KMJ�j,ff SEE�ttJ1G� flS�At�USMKFJ�T Silt. RE��tRED.
Signature
Registration Numbe kQtiO9
Date '1 Z- Z'x -9$
,`,,��418.
•lob CAROI/ ..
ESSipy;9
r
? SEAL
14109
NE�`••�
SEAL

C, <
OFFICE USE ONLY
Date Received
Fee Paid
Permit Number
fv O o
to. 7
6 /a49
IState of North Carolina
Department of Environment and Natural Resources
Division of Water Quality
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
This form may be photocopied for use as an original
1. GENERAL INFORMATION
1. Applicants name (specify the name of the corporation, individual, etc. who owns the project):
T�RXMS
2. Print Owner/Signing Official's name and title (person legally responsible for facility and compliance):
3. Mailing Address for person listed in item 2 above:
kg60 So.+'t l(oTH SrryawET
City:_ WNUVAX1.1 -rot.] State: ►JC Zip: n40l
Telephone Number: _( '{l0 1 343 - g94i
4. Project Name (subdivision, facility, or establishment name - should be consistent with project name on plans,
specifications, letters, operation and maintenance agreements, etc.):
aAt3oV6�t, NIsb - Q -rto h E1'ti01�EL
5. Location of Project (street address):
5 �►5 SaQ_ry% CoLtrEC�E t2n�o
City: VJ% L.t-A It,) 6,T-01J County: N 8w
6. Directions to project (from nearest major intersection):
ti
��. �O Sovrl+ oP to.�TEre56�.�',lgN o� Ge+�EEN4.iYL�A+t'2oAA ��
N4t> S .Co'Lme- Qt> NG 13z.) AL.oI-A G S . COL-( -:-CS `204-O
r
7. Latitude: 0 34°_ 8. g(64 t Longitude: '%tJ 1 `T O SS. dt`J(V of project
$. Contact person who can answer questions about the project:
Name:_ Telephone Number: ( 910
II. PERMIT INFORMATION:
1. Specify whether project is (check one)
New
Form SWU-101 Version 3.99 Page I of
Renewal ✓ Modification

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2. If this application is being submitted as the result of a renewal or modification to an existing permit, list the
existing permit number S ZSG AZvoj and its issue date (if known) 4 ^ t`'T - 98
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.
WET T �Y�1TlbtiV TSAS1N
2. Stormwater runoff from this project drains to the tAW7V C'9.E.M River basin.
3. Total Project Area: acres 4. Project Built Upon Area: Sio•4P %
5. How many drainage areas does the project have? Z
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.
A. a7r txo AKsac ,,%bee . , = &tr AaPj=-,AS
Basin Information
Drainage Area I
Drainage Area 2
Receiving Stream Name
oT CvtF_6K
o W ces
Receiving Stream Class
C- 5",,
Drainage Area
5p
L,\$ A'L
Existing Impervious` Area
CIS
Proposed Impervious`Area
% Impervious' Area (total)
Impervious"' Surface Area
Drainage Area 1
Drainage Area 2
On -site Buildings
Sir
On -site Streets
On -site Parking
0 SG
On -site Sidewalks
O SC
Other on -site
Off -site
Total: 'RootS,;:,
Total: b
Impervious area is defined as the built upon area including, but not limited to, buildings, roads, parking areas,
sidewalks, gravel areas, etc.
Form SWU-101 Version 3.99 Page 2 of 4

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7, How was the off -site impervious area listed above derived?— rSoaE P+EV_V%%. *rvriea Td
__. bJ2,P -%-) taro Pvto yu CT O%RAw.JAtt E AVe,4
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
N, h . 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 __ N ) .A 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 be 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-I09
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)
• Detailed narrative description of stormwater treatment/management
• 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)
Vll. 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):P LLC.
Mailing Address: 'AIO Ave
City: \).1%\.►.a NO rwatJ State: 13G Zip: Z5403
Phone: ( g \ 0
VIII. APPLICANT'S CERTIFICATION
Fax:
1. (print or type name of fw.mn listed in General Information, item Z) b Y2 . . W *t-�-� Aw► IRAy_iNS
certify that the information included on this permit application form is, to the best of my knowledge, correct and
that the project will be constructed in conformance with the approved plans, that the required deed restrictions
and protective covenants will be recorded, and that the proposed project complies with the requirements of 15A
NCAC 21-1.1000. /)
Date: `G l
Form SWU-101 Version 3.99 Page 4 of 4

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Permit No.
{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
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: A-OAMOPz Alap 1RG od��
Contact Person: Mt . e W%vreNc. Phone Number: q
For projects with multiple basins, specify which basin this worksheet applies to: tJ IA
elevations
Basin Bottom Elevation 1$. ft.
Permanent Pool Elevation 22-5 ft.
Temporary Pool Elevation Z3•S ft.
areas
Permanent Pool Surface Area 83815 sq. ft.
Drainage Area Z • SO ac.
Impervious Area Z.O°�� ac.
volumes
Permanent Pool Volume
Temporary Pool Volume
Forebay Volume
Other parameters
SA/DA I
Diameter of Orifice
Design Rainfall
Design TSS Removal 2
; {73 cu. ft.
i Sag -cu. ft.
i'4 -7 Z cu. ft.
`7.4
t - s718 in.
1• in.
Cto %
(floor of the basin)
(elevation of the orifice)
(elevation of the discharge structure overflow)
(water surface area at the orifice elevation)
(on -site and off -site drainage to the basin)
(on -site and off -site drainage to the basin)
(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 SWU-102 Rev 3.99 Page I of 4

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Footnotes:
When using the Division SAIDA tables, the correct SAIDA 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.
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.
1I. 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
i
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.
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)
i The basin length to width ratio is greater than 3:1.
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.
ZAX k. A recorded drainage easement is provided for each basin including access to nearest right-
of-way.
I. 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.
TZ\JMA 1M T'WuwN bu-b
III. 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 `,does not incorporate a vegetated filter at the outlet.
This system (check one) 0 does Kdoes not incorporate pretreatment other than a forebay.
Farm SWU-102 Rev 3.99 Page 2 of

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. 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 scmi-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 shalt be such that it will give an accurate
depth reading and not readily penetrate into accumulated sediments.
When the permanent pool depth reads 3 • D feet in the main pond, the sediment shall be removed.
When the permanent pool depth reads 3.0 feet in the forebay, the sediment shall be removed.
BASIN DIAGRAM
(fill in the blanks)
0 Permanent Pool Elevation
Sediment Re oval El, Vol •S 75 0
-------------- -- Sediment Removal Elevation ISt•S 75%
Bottom Ele ation 18, %\ ----------------
----
Bottom Elevation 18 • 25%
F'OREBAY 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 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 name: br#- - .3. W \ A +v"+ E n►x DNS
Title: lfA.--r,3 rn V.
Address: VR40 .m► \(o r+ WC, ZbAok
Phone
Signa
Date:
Note: The legally responsible party should not be a homeowners association unless more than 501/o of the lots have been sold and a
resident of the subdivision has been named the president.
I, �P bt) rah �f r_� n 5eui e 1 I , a Notary Public for the State of _A�bC`f`Yl l a ice( I � (La ,
County of KI.N1 H�AhbVP,i , do hereby certify that �� s �_1'Yi Co, �, 0 S
personally appeared before me this Je day of flu.! bD , and acknowledge the due
execution of the forgoing wet detention b sin maintenance requirements. Witness my hand and official seal,
A
arwj A111L
�
n
t
SEAL
My commission expires."
Form SWU-102 Rev 3.99 Page 4 of 4

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