SW7080801_CURRENT PERMIT_20080820

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

g= ' —I
lnl�RO
Michael F. Easley, Governor
William G. Ross Jr., Secretary
North Carolina Department of Environment and Natural Resources
August 20, 2008
Mr. Daniel F. Scanlon, II, County Manager
Currituck County
PO Box 39
Currituck, NC 27929
Dear Mr. Scanlon:
Coleen H. Sullins, Director
Division of Water Quality
Subject: Stormwater Permit No. SW7080801
Moyock Public Library
High Density Project
Currituck County
The Washington Regional Office received a complete Stormwater Management Permit
Application for Moyock Public Library on August 4, 2008. 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. SW7080801
dated August 20, 2008, for the construction of the subject project.
r213//s-I
This permit shall be effective from the date of issuance until August 20, 2018, 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 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 150E of the North Carolina General Statutes, and filed with the Office of
Administrative Hearings, 6714 Mail Service Center, Raleigh, NC 27699-6714. 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 Samir Dumpor, or me at [phone].
Sincerely,
L Al H
Regional Supervisor
Surface Water Protection Section
AH/sd: J:\WPDATA\WQS\ State SW-SD\Permits — Wet Pond\SW7080801
cc: Scott Acey, PE, MSA, P.C. (5033 Rouse Dr., Virginia Beach, VA 23462-3708)
AC rntuck County Building Inspections
AC
Regional Office
Central Files
North Carolina Division of Water Quality Internet www.ncwaterguality.org One
943 Washington Square Mall Phone [phone] NorthCarolina
Washington, NC 27889 Fax [phone] Naturally
An Equal Opportunity/Affirmative Action Employer —50%Recycled110% Post Consumer Paper Naturally

1
State Stormwater Management Systems
Permit No. SW7080801
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
Currituck County
Moyock Public Library
Currituck County
FOR THE
construction, operation and maintenance of a wet detention pond in compliance with
the provisions of 15A NCAC 2H .1000 (hereafter referred to as the "stormwater rules')
and the approved stormwater management plans and specifications and other
supporting data as attached and on file with and approved by the Division of Water
Quality and considered a part of this permit.
This permit shall be effective from the date of issuance until August 20, 2018, and shall
be subject to 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 on page 3 of this permit, the Project Data Sheet. The
stormwater control has been designed to handle the runoff from 138,652 square
feet of impervious area.
3. The tract will be limited to the amount of built -upon area indicated on page 3 of
this permit, and per approved plans.
4. All stormwater collection and treatment systems must be located in either
dedicated common areas or recorded easements. The final plats for the project
will be recorded showing all such required easements, in accordance with the
approved plans.
5. The runoff from all built -upon area within the permitted drainage area of this
project must be directed into the permitted stormwater control system.
Page 2 of 8

estate zz)tormwater management oysterns
Permit No. SW7080801
l
13.
The following design criteria have been provided in the wet detention pond and
must be maintained at design condition:
a. Drainage Area, acres:
5.07 (on -site)
2.85 (off -site)
b. Total Impervious Surfaces, ftZ:
64,818 (on -site)
73,834 (off -site)
C. Pond Depth, feet:
6.50
d. TSS removal efficiency:
90%
e. Permanent Pool Elevation, FMSL:
4.00
f. Required Permanent Pool Surface Area, ftZ:
16,914
g. Provided Permanent Pool Surface Area, ftZ:
16,928
h. Permanent Pool Volume, ft3:
56,110
i. Temporary Storage Elevation, FMSL:
4.70
j. Required Storage Volume, ft3:
11,827
k. Provided Storage Volume, ft3:
13,533
I. Controlling Orifice:
2" 0 pipe
M. Receiving Stream/River Basin:Northwest River / Pasquotank River basin
n. Stream Index Number: 30-1-2-2
o. 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
Page 3 of 8

f
State Stormwater Management Systems
Permit No. SW7080801
specifications.
f. Debris removal and unclogging of outlet structure, orifice device, flow
spreader, catch basins and piping.
g. Access to the outlet structure must be available at all times.
4. Records of maintenance activities must be kept and made available upon
request to authorized personnel of DWQ. The records will indicate the date,
activity, name of person performing the work and what actions were taken.
Decorative spray fountains will 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 this pond is 1/6 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. Access to the stormwater facilities shall be maintained via appropriate
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. Redesign 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,
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.
Page 4 of 8

State Stormwater Management Systems
Permit No. SW7080801
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 at all times.
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
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 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) 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 a request 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.
Page 5 of 8

I
State Stormwater Management Systems
Permit No. SW7080801
9. The permittee shall notify the Division any name, ownership or mailing address
changes within 30 days.
10. This permit shall be effective from the date of issuance until August 20, 2018.
Application for permit renewal shall be submitted 180 days prior to the expiration
date of this permit and must be accompanied by the processing fee.
Permit issued this the 20th day of August, 2008.
NORTH CAROLINA ENVIRONMENTAL MANAGEMENT COMMISSION
Coleen H. Sullins, Director
Division of Water Quality
By Authority of the Environmental Management Commission
Stormwater Permit No. SW7080801
for
Page 6 of 8

State Stormwater Management Systems
Permit No. SW7080801
Moyock Public Library
Stormwater Permit No. SW7080801
Currituck 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:
Signature
Registration Number
Date
SEAL
Page 7 of 8

State Stormwater Management Systems
Permit No. SW7080801
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 Washington Regional Office
Currituck County Building Inspections
Page 8 of 8

Fron:MSA P.C. 7574600634 10/23/2008 08:07 #645 P.001/003
MSA, P.C., 5033 Rouse Drive, Virginia Beach, Virginia 23462-3708
757490-9264 (OFFICE) 757490-0634 (FAX)
www.msaonline.com
"Offices in Hampton Roads and Virginia's Eastern Shore"
Environmental Sciences • Geosciences • Planning • Surveying • 5pfteering • Landscape Architec&re
Pro 1AAte:
Project Numb of pages (including cover sheet)
1 I
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REMARKS:
Celebrating
Years
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From:NSA P.C.
7574900634 10/23/2009 08:08 #645 P.002/003
waw vwr,n..I , Jyslerns
. Permit No. SVV7080801
Moyock Public Library
Stormwater Permit No. SW7080801
Currituck County
Designer's Certification
I, C. Scott Acey , as a duly registered Professional Engineer in the
State of North Carolina, having been authorized to observe Brio ioal weekly/ full
time) the construction of the project,
Movock Public Library
(Project)
for Currituck County (Project Owner) hereby state that, to the
best of my abilities, due care and diligence was used in the observation of the project.
construction such that the construction was observed to be built within substantial
compliance and intent of the approved plans and specifications.
The checklist of items on page 2 of this form is included in the Certification.
Noted deviations from approved plans and specification:
SEAL
Signature C C'! 0�/Vi��
Registration Number 03172 `2
A
Date October 21, 2009 = 0.317r28� ;
lu 21 � C
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Page 7 of 8

From:MSA P.C. 7574900634 10/23/2009 08:08 #645 P.003/003
State Storms er Management Systems
Permit No. SVV7080801
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.
_V�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.
_V,-'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.
�1. The permitted amounts of surface area and/or volume have been
provided.
✓ 12. Required drawdown devices are correctly sized per the approved plans
3. All required design depths are provided.
�14. All required parts of the system are provided, such as a vegetated shelf,
and a forebay.
5. The required system dimensions are provided per the approved plans.
cc: NCDENR-DWQ Washington Regional Office
Currituck County Building Inspections
Page 8 of 8

wago colpY
...... . :. :. ,` . DWQ USE ONLY
Date Received
Fee Paid
Permit Number
ufir 4 a�o9
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W a 8 o go I
c.K-1- gG069
State of North Carolina
Department of Environment and Natural Resources
Division of Water Quality
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
77iis 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):
Currituck County
2. Print Owner/Signing Official's name and title (person legally responsible for facility and compliance):
Daniel F. Scanlon, II , County Manager
3. Mailing Address for person listed in item 2 above:
City: Currituck State: NC Zip: 27929
Phone: ( 252 ) 232-2075 Ext. 221 Fax: ( 252 ) 232-3551
Email: dscanlon©co.currituck.nc.us
4. Project Name (subdivision, facility, or establishment name - should be consistent with project name on plans,
specifications, letters, operation and maintenance agreements, etc.):
Moyock Public Library
5. Location of Project (street address):
City: Moyock County: Currituck Zip: 27958
6. Directions to project (from nearest major intersection):
Approximately 0.40 miles from intersection of Guinea Road and Tulls Creek Road
7. Latitude:36° 30' 55" N Longitude:76° 07' 53" W of project
8. Contact person who can answer questions about the project:
Name: C. Scott Acey Telephone Number: ( 757 ) 490-9264
Email: Scott AceyQmsaonline.com
IL PERMIT INFORMATION:
1. Sp cify whether project is (check one): ®New []Renewal ❑Modification
�iry to
C I Iva/h �m�c cnl,yC', ccn,
Form SWU-101 Version 03.27.08 Page 1 of

2. If this application is being submitted as the result of a renewal or modification to an existing permit, list the
existing permit number N/A and its issue date (if known) N/A
3. Specify the type of project (check one):
❑Low Density ®High Density ❑Redevelop ❑General Permit ❑Universal SMP ❑Other
4. Additional Project Requirements (check applicable blanks; information on required state permits can be
obtained by contacting the Customer Service Center at 1-877-623-6748):
❑CAMA Major ®Sedimentation/Erosion Control 0404/401 Permit ❑NPDES Stormwater
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.
The proposed stormwater runoff will be collected and treated in a proposed wet detention basin facility. The
BMP has been adequately sized to achieve the 90% TSS removal requirement
2. Stormwater runoff from this project drains to the Northwest River basin.
3. Total Property Area: 12.20 acres 4. Total Wetlands Area: N/A acres
5. 100' Wide Strip of Wetland Area: N/A acres (not applicable if no wetlands exist on site)
6. Total Project Area**: 12.20 acres 7. Project Built Upon Area: 30 (project site) %
8. How many drainage areas does the project have? 1
9. 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.
For high density projects, com lete the table with one drainage area for each engineered stormwater device.
Basindnformation
Drainage Area 1
Drainage Area 2
Receiving Stream Name
Northwest River
Stream Class & Index No.
C; Sw / 30-1-2-2
Total Drainage Area (so
344,995
On -site Drainage Area (so
220,780
Off -site Drainage Area (so
124,215
Existing Impervious* Area (so
7,450
Proposed Impervious*Area (so
138,652
Impervious* Area (total)
40.2
Impervious* Surface Area
Drainage Area 1
Drainage Area 2
On -site Buildings (so
10,931
On -site Streets (so
-
On -site Parking (so
44,192
On -site Sidewalks (so
9,695
Other on -site (so
-
Off -site (so
73,834
Total (so:
138,652
* Impervious area is defined as the built upon area including, but not limited to, buildings, roads, parking areas,
sidewalks, gravel areas, etc.
**Total project area shall be calculated based on the current policy regarding inclusion of wetlands in the built upon area
percentage calculation. This is the area used to calculate percent project built upon area (BUA).
Form SWU-101 Version 03.27.08 Page 2 of

10. How was the off -site impervious area listed above derived? The pavement for "Campus Drive" (including
part of Tulls Creek Road improvments) and also the development of the Future Site (assuming 70%
imperviousness) has been accounted for.
IV. DEED RESTRICTIONS AND PROTECTIVE COVENANTS
One of the following 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. Forms can be
downloaded from httl2:/ih2o.enr.state.nc.us/su/bml2 forms.htm - deed restrictions.
Form DRPC-1
High Density Commercial Subdivisions
Form DRPC-2
High Density Developments with Outparcels
Form DRPC-3
High Density Residential Subdivisions
Form DRPC-4
Low Density Commercial Subdivisions
Form DRPC-5
Low Density Residential Subdivisions
Form DRPC-6
Low Density Residential Subdivisions with Curb Outlets
By your signature below, you certify that the recorded deed restrictions and protective covenants for this
project shall include all the applicable items required in the above form, 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. Forms can be downloaded from htt2://h2o.enr.state.nc.us/su/bml2 forms.htm.
Form SW401-Low Density
Form SW401-Curb Outlet System
Form SW401-Off-Site System
Form SW401-Wet Detention Basin
Form SW401-Infiltration Basin
Form SW401-Infiltration Trench
Form SW401-Bioretention Cell
Form SW401-Level Spreader
Form SW401-Wetland
Form SW401-Grassed Swale
Form SW401-Sand Filter
Form SW401-Permeable Pavement
Low Density Supplement
Curb Outlet System Supplement
Off -Site System Supplement
Wet Detention Basin Supplement
Infiltration Basin Supplement
Underground Infiltration Trench Supplement
Bioretention Cell Supplement
Level Spreader/Filter Strip/Restored Riparian Buffer Supplement
Constructed Wetland Supplement
Grassed Swale Supplement
Sand Filter Supplement
Permeable Pavement Supplement
Farm SWU-101 Version 03.27.08 Page 3 of

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 compplete application package should be
submitted to the appropriate DWQ Office. (Appropriate office may be found by locating project on the
interactive online map at http://h2o.enr.state.nc.us/su/msi maos.htm)
1. Please indicate that you have provided the following required information by initialing in the space provided
next to each item.
Initials
• Original and one copy of the Stormwater Management Permit Application Form c-5A
• Original and one copy of the Deed Restrictions & Protective Covenants Form (if r.bA
required as per Part IV above)
• Original of the applicable Supplement Form(s) and O&M agreement(s) for each BMP cSA
• Permit application processing fee of $505 (Express: $4,000 for HD, $2,000 for LD)
payable to NCDENR c5A
• Calculations & detailed narrative description of stormwater treatment/management GSA
• Copy of any applicable soils report r5A
• Two copies of plans and specifications (sealed, signed & dated), including: [gA
- 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. (ex. designing engineer or firm)
Designated agent (individual or firm): M SA,P. C. - C• Scoi1- A"
Mailing Address: 5033 f�ouSe. Dn4e.
City: Vic:qrnfra &2ac_�-, State: VA Zip: Z5Jg0
Phone: (']5,7 ) 1-490- 3264
Email: 5 d MS co.vt.
VIII. APPLICANT'S CERTIFICATION
Fax: ( '75-7 ) W16- "34
I, (print or hype name of person listed in General Information, item 2) C��kr �. �� �� Ss
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 corded, and that the proposed project complies with the requirements of 15A
NCAC 2H .1Q00. ,­
Date:_ _ -(-� -Q8
Form SWU-101 Version 03.27.08
Page 4 of 4

MSA, P.C.
5033 Rouse Drive, Virginia Beach, VA 2,W2-3708
[phone] e [phone] (FAX) o wknvmsaini ine.com
Offices in Virginia Beach and Virginia's Eastern Shore
Environmental Sciences • Geosciences • Planning • Surveying • Engineering • Landscape Architecture
July 21, 2008
Washington Regional Office
The Division of Water Quality
943 Washington Square Mall
Washington, NC 27889
RE: Moyock Public Library
MSA #05144A
Review for State Stormwater Permit
To Whom It May Concern:
Enclosed for your review and approval is the first submittal package for the referenced project.
Should you have any questions or need additional information, please contact me at (757) 490-
9264 or email me at [e-mail].
cU
C. Scott cey P.E., NSPE
Associate, erector of Engineering
CSA/cag
Enclosures
Cc: Ed Lazaraon — The Design Collaborative
Eric Weatherly— Currituck County
"F.%PF.RIFNCF..-THE 31SA DIFFERF.,\'CE!"

D F?l��Il�(I Permit Number:
U 11 (to be provided by DWQ)
Drainage Area Number: 1
AUG 0 Waltbetention Basin Operation and Maintenance Agreement
DWO-W ° R0
I will keep a maintenance record on this BMP. This maintenance record will be kept in a
log in a known set location. Any deficient BMP elements noted in the inspection will be
corrected, repaired or replaced immediately. These deficiencies can affect the integrity
of structures, safety of the public, and the removal efficiency of the BMP.
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 ® does not incorporate a vegetated filter at the outlet.
This system (check one):
❑ does ® does not incorporate pretreatment other than a forebay.
Important maintenance procedures:
— Immediately after the wet detention basin is established, the plants on the
vegetated shelf and perimeter of the basin should be watered twice weekly if
needed, until the plants become established (commonly six weeks).
— No portion of the wet detention pond should be fertilized after the first initial
fertilization that is required to establish the plants on the vegetated shelf.
— Stable groundcover should be maintained in the drainage area to reduce the
sediment load to the wet detention basin.
— If the basin must be drained for an emergency or to perform maintenance, the
flushing of sediment through the emergency drain should be minimized to the
maximum extent practical.
— Once a year, a dam safety expert should inspect the embankment.
After the wet detention pond is established, it should be inspected once a month and
within 24 hours after every storm event greater than 1.0 inches (or 1.5 inches if in a
Coastal County). Records of operation and maintenance should be kept in a known set
location and must be available upon request.
Inspection activities shall be performed as follows. Any problems that are found shall
be repaired immediately.
BMP element:
Potentialproblem:
How I will remediate theproblem:
The entire BMP
Trash/debris is present.
Remove the trash/debris.
The perimeter of the wet
Areas of bare soil and/or
Regrade the soil if necessary to
detention basin
erosive gullies have formed.
remove the gully, and then plant a
ground cover and water until it is
established. Provide lime and a
one-time fertilizer application.
Vegetation is too short or too
Maintain vegetation at a height of
long.
approximately six inches.
Form SW40I-Wet Detention Basin O&M-Rev.3 Page I of 4

Permit Number:
BMP element:
The inlet device: pipe or
Swale
The forebay
The vegetated shelf
treatment area
(to be provided by DWQ)
Drainage Area Number: I
Potential problem:
The pipe is clogged.
The pipe is cracked or
otherwise damaged.
Erosion is occurring in the
Swale.
Sediment has accumulated to
a depth greater than the
original design depth for
sediment storage.
Weeds are present.
Best professional practices
show that pruning is needed
to maintain optimal plant
health.
Plants are dead, diseased or
dying.
Weeds are present.
Sediment has accumulated to
a depth greater than the
original design sediment
storage depth.
Algal growth covers over
50% of the area.
Cattails, phragmites or other
invasive plants cover 50% of
the basin surface.
How I will remediate the prob]
Unclog the pipe. Dispose of the
sediment off -site.
Replace the pipe.
Regrade the Swale if necessary to
smooth it over and provide erosion
control devices such as reinforced
turf matting or riprap to avoid
future problems with erosion.
Search for the source of the
sediment and remedy the problem if
possible. Remove the sediment and
dispose of it in a location where it
will not cause impacts to streams or
the BMP.
Provide additional erosion
protection such as reinforced turf
matting or riprap if needed to
prevent future erosion problems.
Remove the weeds, preferably by
hand. If pesticide is used, wipe it on
the plants rather than spraying.
Prune according to best professional
practices
Determine the source of the
problem: soils, hydrology, disease,
etc. Remedy the problem and
replace plants. Provide a one-time
fertilizer application to establish the
ground cover if a soil test indicates
it is necessary.
Remove the weeds, preferably by
hand. If pesticide is used, wipe it on
the plants rather than soravine.
Search for the source of the
sediment and remedy the problem if
possible. Remove the sediment and
dispose of it in a location where it
will not cause impacts to streams or
the BMP.
Consult a professional to remove
and control the algal growth.
Remove the plants by wiping the
with pesticide (do not spray).
Form SW401-Wet Detention Basin O&M-Rev.3 Page 2 of 4

Permit Number:
(to be provided by DWQ)
Drainage Area Number: I
BMP element:
Potentialproblem:
How I will remediate theproblem:
The embankment
Shrubs have started to grow
Remove shrubs immediately.
on the embankment.
Evidence of muskrat or
Use traps to remove muskrats and
beaver activity is present.
consult a professional to remove
beavers.
A tree has started to grow on
Consult a dam safety specialist to
the embankment.
remove the tree.
An annual inspection by an
Make all needed repairs.
appropriate professional
shows that the embankment
needs repair.
The outlet device
Clogging has occurred.
Clean out the outlet device. Dispose
of the sediment off -site.
The outlet device is damaged
Repair or replace the outlet device.
The receiving water
Erosion or other signs of
Contact the local NC Division of
damage have occurred at the
Water Quality Regional Office, or
outlet.
the 401 Oversight Unit at 919-733-
1786.
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 6.5 feet in the main pond, the sediment
shall be removed.
When the permanent pool depth reads 44:5 feet in the forebay, the sediment
shall be removed.
BASIN DIAGRAM
ill in the blanks)
Permanent Pool Elevation 4_0
Sediment Removal . -0.5 Pe manen Pool
-------------- Volume Sediment Removal Elevation -2.5 Volume
Bottom Elevatio -1.5 -ft Min.
------------------------------ ------------- ------
Sediment Bottom Elevation -3.5 1-ft r
Storage Sedimet
Storage
FOREBAY MAIN POND
Form SW401-Wet Detention Basin O&M-Rev.3 Page 3 of 4

It
Permit Number:
(to be provided by DWQ)
I acknowledge and agree by my signature below that I am responsible for the
performance of the 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.
Project name:Moyock Public Library
BMP drainage area number:
Print name: OF Jr -
Title: Cis •iaiJa�
Address:
Date:
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.
h Ma r,q. (2, l be,4 a Notary Public for the State of
ll e C4-1% ((la r n 1,a County of do hereby certify that
10.( C7. So ? N (o n 'Tf personally appeared before me this / S
day of 3 �,o o g , and acknowledge the due execution of the
forgoing wet etention basin maintenance requirements. Witness my hand and official
seal,
SEAL
My commission expires a
Form SW401-Wet Detention Basin O&M-Rev.3
Page 4 of 4

STORMWATER SUBMITTAL REQUIREMENTS
WET DETENTION POND
Objectjve
A. collect all runoff from all BUA (proposed and/or existing and/or offsite) as the case may be,
by any means including piping or swales, and direct it to the pond.
B. Check the proposed pond design to make sure it meets or exceeds the minimum design
criteria for surface area, volume and drawdown.
H. What tikes up a complete wet detention pond application package?
A. wo sets of sealed, signed & dated layout & grading plans with appropriate details.
(Additional sets of plans may be requested for projects in certain counties)
B. Completed application with supplement(s), SWU-101, SW401-Wet Pond, and inspection and
d�gJ�aintenance agreements.
C.Y/�Yt�eed restriction document, if applicable (for subdivisions & projects with out parcels)
D. 1✓/ Sealed, signed & dated calculations.
E. Estimated seasonal high water table elevation at all pond locations.
F Chlorides test results must be provided if the project is within ''/z mile of SR waters (Phase 11).
/ (This is only required to test out of SR water treatment requirements)
III. BIMS entry (for DWQ use only)
Enter & track application acknowledged date, review date, add info requested/received dates, permit
issue dates, and drainage area info. Best done after the add info letter is written and before sending
permit up for signature.
IV. Shell documents (for DWQ use only)
Permit shells: s:\wqs\stormwater\shells\highcompond
s:\wqs\stormwater\shells\highsubpond
s:\wqs\stormwater\shells\HDhybrid
Spreadsheet: s:\wqs\stormwater\excel spreadsheets\pond
VI. Review Procedure
A. APPLICATION
1. �n original signature is required. Photocopied signatures cannot be accepted.
2. t/,; completed wet detention pond supplement and a signe dated and notarized wet
V/detention pond Inspection and Maintenance Agreeme�h an original signature.
3. The numbers on the supplement match up to the numbers used in the calculations and
/ hown on the plan details.
4. t//�uilwtpon uareas are reported in square feet in Section 111.6.
5. V Receiving stream name and classification. This is important because in the non -Phase
I counties, a wet pond cannot be used on a project that is.within'/z mile of and draining
to SA waters. For Phase II,'a wet pond is allowed within '/z mile of SA•waters.
6.V ection 111.6 is filled in -cannot be left blank. One column must be filled in for each
/proposed wet pond.
7. If the applicant is a corporation, partnership orLLC, look it up on the Secretary of State
Corporations Database. Make sure corporation is spelled correctly (capitalization and
punctuation matter) and that the person signing the application is at least a vice-
president in the corporation, a General Partner in the partnership, a member in a
member -managed LLC, or the manager of a manager -managed LLC. Need
documentation to support if the Articles of Incorporation do not list the members or
managers of the LLC. If an agent signs, then a letter of authorization is needed from the
president, vice president, general partner, member or manager.
8or subdivided projects, a signed and notarized deed restriction statement must be
9'�F
provided.

Wet Detention Pond, cont.
B. CALCU/IONS
1. The orifice is sized based on drawing down the calculated minimum volume in 2-5
days. The average head to use in the orifice equation is approximately;one-third of
the distance between the permanent pool elevation (PPE) and the elevation of the
next available outlet above the permanent pool. The elevation of the next available
outlet must be either the elevation where the minimum volume is provided, or it can
be higher. The temporary pool elevation (TPE) to report on the supplement will be
the elevation of the next available outlet above the PPE. The temporary pool volume
(TPV) to report on the supplement is the volume between the specified PPE and the
2P/TPE.
1 For Phase II projects that are within '/2 mile of and draining to SR waters, the
difference in runoff from the predevelopment and post -development conditions for
he 1 year 24 hour storm must be controlled and treated.
3 For Phase II projects, the discharge rate leaving the pond can be no more than the
re -development discharge rate for the 1 year 24 hour storm.
41)F r Phase II projects draining to SA water, no discharge to surface waters may occur
/ om wet ponds. The discharge leaving the orifice must be effectively infiltrated prior to
reaching surface waters.
5.7deeper
a average pond depth is the permanent pool volume divided by the permanent pool
rface area. The result must be between 3 ft. and 7.5 ft. Parts of the pond can be
than 7.5 ft., but in no case can any part of the pond be less than 3 ft deep.
6.he 85% a is used a 30' vegetated filter must be provided at the outlet of the .
/;,
d. If th 90% T S chart is used, no filter is required.
7.n the co ec DA TSS chart from the BMP Manual noting that there are different
di Brent areas of the State.
8.equired surface area at permanent pool.
9. Provided surface area at permanent pool (Based on pond dimensions)
1 Oequired volume calculation based on 1.5" storm for Phase II projects' and 1" storm for
T all others projects. 'unless the project is Phase II and within'/z mile of and draining to
SR waters then the volume calculation must be based on difference between the pre
/a d post development conditions for the 1-yr 24-hr storm.
11. ble of elevations, areas, incremental volumes and accumulated volumes for overall
pond and for forebay, to verify volumes provided.
12. Forebay designed to hold 20% of the permanent pool volume. (Range of 18%-22%
1' on)erosive flow for 10 yr. storm in the vegetated filter, if using 85% TSS.
14 T � seasonal high water table must be at or below the proposed permanent pool
eyation to assure that the necessary volume will be available above the permanent
Pool.
15. ounding numbers off during the calculation process can result in•deficiencies. Do not
ound the numbers until you get to the final result.
16. An additional one foot must be excavated below the bottom elevation of the pond. The 1
foot sediment accumulation depth is not included in the average depth calculation.
C�a� �vid� �o(Vw.e i-� sne a��-' 5,45
I „�(� c�1�5
o S"Ph�—� Z,S)T �1�r5_C-3.50>
V=e�Q �A x 2 ����s 40
oGU
�V = 0.O5 X 0,9 n �� _ ().�I Come. W'4� ?8750
V= 36-3�0 " 1 x P'V �_'eP�)ec' f1'nJV71
363v '� 1 X � x 7-52

Wet Detention Pond, cont.
C. PLANS- Due to storage space constraints, plan sheets should be kept to a minimum. For
small commercial single wet pond projects, the plan set could consist of only 2 or 3 sheets,
layout, rading and details. For larger projects, show as much information as possible on as
few is as possible, without cluttering them up.
1. velopment/Project Name
2. ngineer name and firm.
3. egend
4. orth Arrow
5. ocation Map with nearest intersection of two major roads shown. Major road is any 1,
or 3 digit NC, US or interstate highway.
6. ale- standard engineering scale, no off-the-wall stuff.
7. to
8. sion number and date, if applicable.
9. rnvegrts,
inal contours, proposed contours, spot elevations, finished floor elevations, pipe
swale inverts, etc.
10. sting drainage (piping, swales, ditches, ponds, etc.), including off -site. Include a map
elineating the offsite drainage areas.
11 operty/Project boundary lines, bearing & distances.
12 can High Water Line or Normal High Water Line, if applicable.
�C 13. he permanent pool elevation must be above the SHWT and above the lowest
tevation of adjacent wetlands. Evaluate the need for a liner and/or berm/slurry wall to
event dewatering the wetland.
14.rainage easement widths, pipe sizes and swale inverts are provided.
15. Wetlands delineated, or a note on the plans that none exist. Get a copy of the wetlands
delineation map signed by the Corps of Engineers, or have the applicant include a copy
oythe unsigned delineation map submitted to the Corps. Wet ponds may not be located
n wetlands unless a permit to fill those wetlands has been obtained.
16Y Details for the roads, parking, cul-de-sacs, including sidewalk width, radii, dimensions &
1 V7nd
artment / Condo development- Provide a typical building footprint with dimensions
note all concrete and wood deck areas.
18 drainage area for each wet pond is clearly delineated and numbered to match up to
calculations and supplement. Drainage area delineation is best done as a separate
In asheet.
19. A pond section detail to include the forebay, a 10 foot wide vegetated shelf, pertinent
elevations for the bottom, permanent pool, temporary pool, and SHWT, 3:1 slopes
ove the permanent pool, and the weir elevation between the main pond and the
9�eb.
20 The 10ayvegetated shelf extends 6" below and 6" above the permanent pool elevation.
21 An outlet structure detail showing a trash rack with <_6" square openings, the necessary
p'rifice invert elevation (i.e., the permanent pool), orifice size and temporary pool
22Wimensions for each line and arc formed by the permanent pool contour.
2 ere the 85% TSS chart was used, a 30 ft. vegetated filter strip is required to be
wn on the plans & detailed (elevations, inverts, slopes, and flow spreader
echanism). Please note that the filter strip is not a ditch.
24. orebay is provided for each inlet and located so as to prevent short-circuiting.
25.E Jrh pond must have a minimum 1.5:1 length to width ratio and a minimum 3:1 flow path
V I gth. Artificial "baffles" of timber, vinyl, or earth can be used to create a longer flow
ath. The top elevation of the baffle should be set at the temporary pool elevation or
higher.
26. A Vegetation plan is specified for the pond, including slopes. Wetlands species are
li ted for planting on the 10:1 shelf. Weeping Love Grass is not suitable as a permanent
egetated cover for pond slopes.
27. All roof drainage must be directed to the pond. Show the roof drain collection lines on
the plan. This is necessary for projects where the buildings back up the property lines
where roof drainage may leave the site prior to going through the pond.