SW7080403_CURRENT PERMIT_20081117

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

TF9
wot. Michael F. Easley, Governor
William G Ross Jr, Secretary
North Carolina Department of Environment and Natural Resources
t '-I
Villas at the Pointe, LLC
Attn: Mr. Eric Avery
821 Ocean Trail, Suite 4
Corolla. NC 27927
Dear Mr. Avery:
Coleen H Sullins Director
Division of Water Quality
November 17, 2008
Subject: Stormwater Permit No. SW7080403
Villas at the Pointe
High Density Stormwater Project
Currituck County
The Washington Regional Office received a completed Stormwater Management Permit application
for the subject project on September 29, 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. SW7080403 dated November 17, 2008
for the subject project.
This permit shall be effective from the date of issuance until November 17, 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 and in the submitted application. 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 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
either Bill Moore, or me at [phone].
5 cerely,
Al Hodge
Regional Supervisor
Surface Water Protection Section
cc: Landmark Engineering & Environmental
tuck County Building Inspections
L,Vvashington Regional Office
Central Files
North Carolina Division of Water Quality Internet. h2o.enr state nc us
943 Washington Square Mall Phone: [phone]
Washington, NC 29889 FAX [phone]
An Equal OpponumtylAKrmative Action Employer - 50 % Recycled110 h Post Consumer Paper
NorthCarojina
Naturally

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
Villas At The Pointe, LLC
Villas at the Pointe
Currituck County
176]Ci1:IZ
construction, operation and maintenance of a wet detention basin 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 November 17, 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 in Section 1.6 on page 3 of this permit. The stormwater controls have been
designed to handle the runoff from 7.43 acres of impervious area.
3. 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 and permit.
4. The tract will be limited to the amount of built -upon area indicated on page 3 of this
permit, and per approved plans.
5. The runoff from all built -upon area within the permitted drainage areas of this project
must be directed into the permitted stormwater control system.
Page 2 of 7

6. The following design criteria have been provided in the wet detention basin and must be
maintained at design condition:
a.
Drainage Area:
23.0 acres
b.
Total Impervious Surfaces:
7.43 acres
C.
Design Storm:
1.0 - inch
d.
Pond Depth:
6.50 ft
e.
TSS removal efficiency:
90 %
f.
Permanent Pool Elevation, FMSL:
3.50 ft
g.
Permanent Pool Surface Area Required:
28,385 sf
h.
Permanent Pool Surface Area Provided:
53,233 sf
i.
Permanent Storage Volume Required:
28,385 cf
j.
Permanent Storage Volume Provided:
89,783 cf
k.
Temporary Storage Elevation, FMSL:
5.00 ft
I.
Small Diameter Controlling Orifice:
3.00 - inch pipe
M.
Receiving Stream/River Basin:
UT-Currituck Sound
n.
Classification of Water Body:
SC
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 Plans 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 bypass structure, filter media, flow spreader,
catch basins, piping and vegetated filter.
g. A clear access path to the bypass structure must be available at all times.
Page 3 of 7

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. 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.
6. 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.
8. Access to the stormwater facilities shall be maintained via appropriate easements at all
times.
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, 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.
10. The permittee shall submit final site layout and grading plans for any permitted future
areas shown on the approved plans, prior to construction.
11. A copy of the approved plans and specifications shall be maintained on file by the
Permittee at all times.
12. 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.
13. This permit shall be effective from the date of issuance until November 17, 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.
Page 4 of 7

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. A copy of the approved plans and specifications shall be
maintained on file by the Permittee for the life of the project.
9. The permittee shall notify the Division of any name, ownership or mailing address
changes within 30 days.
Permit issued this the 17 th day of November, 2008.
NC11`2TH CAROLINA ENVIRONMENTAL MANAGEMENT COMMISSION
for
Coleen H. Sullins, Director
Division of Water Quality
By Authority of the Environmental Management Commission
Permit Number SW7080403
Page 5 of 7

Stormwater Permit No. SV 7080403
Wet Pond System
Villas at the Pointe
Powells Point, NC
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.
Note: The checklist on the following page must be included with this Certification. Any changes
or deviations from the approved plans and specifications must be explained in detail, and may
require a permit modification. The certification forms should be submitted to the Division of
Water Quality at the appropriate Regional office.
Signature
Registration Number
Date
SEAL
Page 6 of 7

Complete this checklist for each system and include with Certification:
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 bypass structure elevations are per the approved plan.
6. The bypass structure is located per the approved plans.
7. A 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. All required design depths are provided.
13. All required parts of the system are provided.
14. The required system dimensions are provided per the approved plans.
Page 7 of 7

LANDMARK ENGINEERING & ENVIRONMENTAL, P.C.
MAILING: P.O. BOX 1 1 90 • KITTY HAWK. NC 27949
PHYSICAL: 8460 CARATOKE HWY. - SUITE 202 • POWELLS POINT. NC 27966
PHONE: [phone] • FAX: [phone] • EMAIL: OFFICE@LANDMARKENG. NET
September 13, 2008
Mr. Bill Moore
NCDE&NR
Division of Water Quality
943 Washington Square Mall
Washington, NC 27889
Re: Villas at the Pointe
Powells Point, Currituck County, NC
Stormwater Management Plan Review SW7080403
Additional Information Submittal
Dear Mr. Moore:
SEP 29 /-"0Gr
Jvi-u`�'1r,J
On Behalf of Villas at the Pointe, LLC, Landmark Engineering & Environmental, P.C. submits the
revised information requested in your letter dated August 28, 2008. The revised items are as follows:
1.) Plan sheet C2 has been corrected.
2.) Plan sheet C6 has been revised, and sheet C4 shows the detailed landscaping plan for the
stormwater pond. The narrative has been revised as requested.
3.) The supplement sheet and and calculation have been revised.
4.) Structural support for the 3 inch outlet orifice has been added on plan sheet C6.
5.) Two sets of revised plans, stormwater narrative, calculations and wet pond supplement are
attached.
Thank you for your time and attention to this matter. If you have any questions or require additional
information please contact me at [phone].
Respectfully submitted,
Landmark Engineering & Environmental, P.C.
Vic *orE.hite, P.E.

' Permit No.
(to be provided by DWQ)
W AJE�O
NCDENR o G
STORMWATER MANAGEMENT PERMIT APPLICATION FORM T
401 CERTIFICATION APPLICATION FORM
WET DETENTION BASIN SUPPLEMENT
This form must be filled out, printed and submitted.
The Required Items Checklist (Part 1/1) must be printed, filled out and submitted along with all of the required information.
I. PROJECT INFORMATION
Project name Villas at the Porte
Contact person Victor White, P.E.
Phone number 252-491-2125 (office) 252-202-6460 (mobile)
Date 9/13/2008
Drainage area number 1
II. DESIGN INFORMATION
Site Characteristics
Drainage area 1,003,276.00 fe
Impervious area 323,548.00 ft2
% impervious
32.25
%
Design rainfall depth
1.00
in
Storage Volume: Non -SR Waters
Minimum volume required
28,385.00
(f3
Volume provided
89,78300
ft'
Storage Volume: SR Waters
1-yr, 24-hr runoff depth
NA
in
Pre -development 1-yr, 24-hr runoff
NA
ft3
Post -development 1-yr, 24-hr runoff
NA
ft3
Minimum volume required
#VALUE!
It'
Volume provided
NA
ft3
Peak Flow Calculations
1-yr, 24-hr rainfall depth
331
in
Rational C, pre -development
0.15
(unittess)
Rational C, post -development
038
(unifless)
Rainfall intensity: 1-yr, 24hr storm
0.14
m/hr
Pre -development 1-yr, 24-hr peak flow
0.48
fl'/sec
Post -development 1-yr, 24-hr peak flow
0.10
ft'Isec
Pre/Post 1-yr, 24-hr peak flow control
-0.39
ft'/sec
Basin Elevations
Basin bottom elevation
-3.00
ft
Sediment cteanoutelevation
-1.00
ft
Bottom of shelf elevation
3.00
It
Permanent pool elevation
3.50
It
SHWT elevation
350
It
Top of shelf elevation
4.00
It
Temporary pool elevation
5.00
It
Form SW401-Wet Detention Basin-Rev.4 Parts I, a 11 Design Summary, Page 1 of 2

• Permit No.
(to be pmv ded by DWQ)
II. DESIGN INFORMATION
Volume and Surface Area Calculations
SAIDA ratio
2.70
(unitless)
Surface area at the bottom of shelf
46,685.00
fe
Volume at the bottom of shelf
139,635.00
ft3
Permanent pool, surface area required
28,385.00
le
Permanent pool, surface area provided
53,233 00
fly OK
Permanent pool volume
186,348.00
ft3
Average depth for SAIDA tables
350
ft OK
Surface area at the top of shelf
57,63100
fe
Volume at the top of shelf
212,441.00
ft3
Forebay volume
41,06100
ft3
Forebay %of permanent pool volume
22.03
% Must be approx. 20%, Adjust pond dimensions
Temporary pool, surface area provided
66,503.00
fh
Drawdown Calculations
Treatment volume drawdown time
Treatment volume discharge rate
Pre -development 1-yr, 24-hr discharge
Post -development 1-yr, 24-hr discharge
Additional Information
Diameter of orifice
Design TSS removal
Basin side slopes
Vegetated shelf slope
Vegetated shelf width
Length of flowpath to width ratio
Length to width ratio
Trash rack for overflow & orifice?
Freeboard provided
Vegetated filter provided?
Recorded drainage easement provided?
Capures all runoff at ultimate build -out?
Drain mechanism for maintenance or emergencies
3.18 days
0.10 ft3/s
0.48 ft3/s
0.10 ft3/s
3
in
90
%
4.00
:1
10.00
1
10.00
ft
18.33
1
18.33
1
Y
(Y or N)
2.00
ft
Y
(YorN)
NA
(YorN)
Y
(Y or N)
NA
OK
OK
OK
OK
OK
OK
OK
OK
OK
OK
OK
OK
OK
Form SW401-Wet Detenton Basin -Rev 4 Paris I & II. Design Summary, Page 2 of 2

Permit
(to be provided by DWQ)
III. REQUIRED ITEMS CHECKLIST
Please indicate the page or plan sheet numbers where the supporting documentation can be found. An incomplete submittal package will
result in a request for additional information. This will delay final review and approval of the project. Initial in the space provided to
indicate the following design requirements have been met. If the applicant has designated an agent, the agent may initial below. If a
requirement has not been met, attach justification.
Page/ Plan
Initials
Sheet No.
VEW
C2,C3
1. Plans (1" - 50' or larger) of the entire site showing:
- Design at ultimate build -out,
- Off -site drainage (if applicable),
- Delineated drainage basins (include Rational C coefficient per basin),
- Basin dimensions,
- Pretreatment system,
- High flow bypass system,
- Maintenance access,
- Proposed drainage easement and public right of way (ROW),
- Overflow device, and
- Boundaries of drainage easement.
VEW
C6
2. Partial plan (1" = 30' or larger) and details for the wet detention basin showing:
- Outlet structure with trash rack or similar,
- Maintenance access,
- Permanent pool dimensions,
- Forebay and main pond with hardened emergency spillway,
Basin cross-section,
- Vegetation specification for planting shelf, and
- Filter strip.
NA
NA
3. Section view of the dry detention basin (1" = 20' or larger) showing:
Side slopes, 3:1 or lower,
- Pretreatment and treatment areas, and
- Inlet and outlet structures.
NA
NA
4. If the basin is used for sediment and erosion control during construction, dean out of the basin is specified
on the plans prior to use as a wet detention basin.
VEW
NARR/CALC
5. A table of elevations, areas, incremental volumes & accumulated volumes for overall pond and for forebay,
to verify volume provided.
VEW
C4
6. A construction sequence that shows how the wet detention basin will be protected from sediment until the
entire drainage area is stabilized.
VEW
CALCS
7. The supporting calculations.
VEW
0&M
8. A copy of the signed and notarized operation and maintenance (O&M) agreement.
NA
NA
9. A copy of the deed restrictions (if required).
VEW
SOILS
10. A soils report that is based upon an actual field investigation, soil borings, and infiltration tests. County
soil maps are not an acceptable source of soils information.
Form SW401-Wet Detention Basin-Rev.4 Part III. Required Items Checklist, Page 1 of 1

LANDMARK ENGINEERING & ENVIRONMENTAL, P.C.
MAILING: P.O. Box 1 190 • KITTY HAWK, NC 27949
PHYSICAL: 8460 CARATOKE Hwy - SUITE 202 • POWELLS POINT. NC 27966
PHONE: [phone] • FAX: [phone] • EMAIL: OFFICE@LANDMARKENG. NET
Villas at the Pointe
Stormwater Management Plan
Revised Design Narrative
September 13, 2008
The above referenced project is a development of a 23 acre parcel into a multifamily
development consisting of 90 town home units and associated amenities and associated parking
and infrastructure. The project also proposes 2 professional office building and associated
infrastructure. The site is located off of US Highway 158 in Powells Point, Currituck County,
North Carolina.
The stormwater management plan consits of a single drainage area as per a telephone
conversation with Mr. Bill Moore of the Division of Water Quality. Stormwater runoff from
proposed impervious surfaces will be conveyed to the stormwater retention system via a
combination of sheet flow and stormwater catch basins/pipes and 2 conveyance decorative
ponds. The proposed Stormwater management system incorporates pipes to provide hydraulic
connections, of the conveyance ponds (ponds B and C). The entire system provide in excess of
the ten year two hour storm, conservatively assuming that 95% of all stormwater is conveyed to
the proposed wet detention pond system. The system is sized to draw down runoff from a 1 inch
storm in 3.18 days using a 3" orifice in the outlet. Provisions have also been designed to provide
an emergency outlet in the event of storms substantially over the design storm. system. The
temporary pool will be drawn down over time and be discharged out of the outlet control
structure through a vegetative filter before entering the Tig-Ma-Tar Ditch. The UDSA's Soil
Survey of Currituck County North Carolina maps the soils as a Portsmouth find sandy loam,
however field investigations of the soil indicate that the soil more closely resembles a Munden
loamy sand. The upper surface horizions are very acidic, creating a hard pan at a depth of
approximately 14 to 18 inches. Underneath this layer is a sand with moderate to rapid
permeability. Based on existing elevations at the site and both Landmark Engineering and
Protocol sampling Services investigations, a seasonal high water table elevation of 3.5 msl
(NAVD 88 datum) was calculated and used for design purposes. A stormwater pond landscaping
plan has been added on plan sheet C4 to show the layout of stormwater planting, (both shallow
water and shallow land), to meet the requirements of section 10.3.7 "Plant and Landscape
Requirements" for a wet detention basin. The wet detention basin cross section on Sheet C6 has
also been revised to reflect the landscaping plan on sheet C4.

LANDMARK ENGINEERING & ENVIRONMENTAL, P.C.
MAILING: P.O. BOX 1 190 • KITTY HAWK, NC 27949
PHYSICAL: 8460 CARATOKE HWY. - SUITE 202 • POWELLS POINT, NC 27966
PHONE: [phone] • FAX: [phone] • EMAIL: OFFICE@LANDMARKENG NET
Villas at the Pointe
STORMWATER MANAGEMENT PLAN CALCULATIONS
Revised 9/13/08
Wet Detention basin A Contour Areas (Calculated by Autocad)
5.0' - 66,503 sq.ft. (Top of Storage @ Overflow Elevation)
4.0'- 57,631 sq. ft.
3.5' - 53,233 sq.ft. (Bottom of temporary storage)
Temporary Pool Volume
5.0' to 4.0' 1.0 ft x ((66,503 sq. ft. + 57,631 sq. ft.)/2) = 62,067 cu. ft.
4.0' to 3.5' 0.5 ft x ((57,631 sq. ft. + 53,233 sq. ft.)/2) = 27,716 cu. ft.
Direct Storage Wet Detention Basin A = 89,783 cu ft
Total impervious coverage = 323,548 sq. ft.
Assume 95% of runoff from impervious coverage reaches infiltration basins
89,783 cu. ft. /(0.95 x 323,548 sq. ft.) = 0.2921 ft. or 3.50 inches
Therefore storage is provided in excess of the design storm
Even if we conservatively assume 100% of runoff reaches basins
89,783 cu. ft. / 323,548 sq. ft. = 0.2775 ft. or 3.33 inches
Which is still well in excess of the design storm

PLANDMARK ENGINEERING & ENVIRONMENTAL, P.C.
I
MAILING: P.O. BOX 1 190 • KITTY HAWK. NC 27949
PHYSICAL: 8460 CARATOKE HWY. - SUITE 202 • POWELLS POINT, NC 27966
11 ' PHONE: [phone] • FAX: 252.491,2285 • EMAIL: OFFICE(-aLANDMARKENG. NET
July 3, 2008
Mr. Bill Moore
VD
NCDE&NR
Division of Water Quality
943 Washington Square Mall �p��g �_
Washington, NC 27889 IY l WAR0
Re: Villas at the Pointe
Powells Point, Currrtuck County, NC
Stormwater Management Plan Review SW7080403
Additional Information Submittal
Dear Mr. Moore:
On Behalf of Villas at the Pointe, LLC, Landmark Engineering & Environmental, P.C. submits the
additional information requested in your letter dated May 28, 2008. The additional items are as follows:
1.) Attached is a portion of a USGS Topo Map and NCRS County Soils Map show the project
location,
2.) As per our conversation, the site is delineated as a single drainage basin. With a single pond
(pond "A") being the permitted stormwater wet pond.
3.) The proposed pond meets the average depth requirements, as shown on the revised supplement
forms, This issue was corrected by utilizing only the volume and surface areas in pond "A"
although the pond has been deepened after our conversation in which you informed me that a 2 to
1 slope could be used below the water surface and vegetative shelf.
4.) Vegetation plan has been revised to meet requirement of rules/BMP manual
5.) Details of vegetated filter, including energy dissipater provided, 3" drawdown orifice
calculations provided
6.) Revised Stormwater narrative provided, as well as revised plans and details reflecting changes.
Thank you for your time and attention to this matter. If you have any questions or require additional
information please contact me at [phone].
Respectfully submitted,
LandmaT Engeering & Environmental, P.C.
Victor White, P.E.

Permit No.
(to be Provided by DW()
'®� A 20F WArpgO
O G
NCDENR
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATION APPLICATION FORM
WET DETENTION BASIN SUPPLEMENT
This form must be filled out, printed and submitted.
The Required Items Checklist (Part ill) must be printed, filled out and submitted along with all of the required information.
I. PROJECT INFORMATION
Project name Villas at the Porte
Contact person Victor White, P.E.
Phone number 252-491-2125 (office) 252-202-6460 (mobile)
Date 7/3/2008
Drainage area number 1
II. DESIGN INFORMATION
Site Characteristics
Drainage area
1,003,276.00
ft'
Impervious area
323,548.00
ft'
% impervious
32.25
%
Design rainfall depth
1.00
in
Storage Volume: Non -SR Waters
Minimum
26,962.00
38S
volume required
Volume provided
89,783.00
fl3—
ft3 1
Storage Volume: SR Waters
1-yr, 24-hr runoff depth
NA
in
Pre -development 1-yr, 24-hr runoff
NA
ft,
Post-development 1-yr, 24-hr runoff
NA
ft,
Minimum volume required
#VALUE!
83
Volume provided
NA
ft,
Peak Flow Calculations
1-yr, 24-hr rainfall depth
3.31
in
Rational C, pre -development
0.15
(unifiers)
Rational C, post -development
0.38
(unifless)
Rainfall intensity: 1-yr, 24-hr stone
0.14
inthr
Pre -development 1-yr, 24-hr peak flow
048
ft"/sec
Post -development 1-yr, 24-hr peak flow
0.10
tt3/sec
Pre/Post 1-yr, 24-hr peak flow control
-0.39
ft3/sec
Basin Elevations
Basin bottom elevabon
-3.00
It
Sediment cleanout elevation
-1.00
ft
Bottom of shelf elevation
3.00
ft
Permanent pool elevation
3.50
ft
SHWTelevation
3.50
It
Top of shelf elevation
4.00
ft
Temporary pool elevation
5.00
fl
Forth SW401-Wet Detention aasin-Rev.4 Parts I. 811 Design Summery, Page 1 of 2

Permit
(to be pmvided by DWQ)
II. DESIGN INFORMATION
Volume and Surface Area Calculations
SA/DA ratio 2.70 (unitless)
Surface area at the bottom of shelf
46,685.00
fe
Volume at the bottom of shelf
139,635.00
ft'
Permanent pool, surface area required
27,088.00
fe
Permanent pool, surface area provided
53,233 00
fe —
OK elf V. 3. >
Permanent pool volume
186,348.00
ft'
Average depth for SA/DA tables
3.50
ft
OK
Surface area at the top of shelf
57,631.00
ft'
Volume at the top of shelf
212,44100
ft'
Forebay volume
41,061.00
ft
Forebay % of permanent pool volume
22.03
%
Must be approx. 20%, Adjust pond dimensions
Temporary pool, surface area provided
66,563.00
ft2 ✓
tk-.�.
Drawdown Calculations
Treatment volume drawdown time
3.18
days
OK
Treatment volume discharge rate
0.10
ft3/s
Pre -development 1-yr, 24-hr discharge
0.48
ft'/s
OK
Post -development 1-yr, 24-hr discharge
0.10
Ill
OK
Additional Information
Diameter of orifice
3
in /
Design TSS removal
90
% v/
Basin side slopes
4.00
:1
OK
Vegetated shelf slope
10.00
:1
OK
Vegetated shelf width
10.00
ft
OK
Length of flowpath to width ratio
18.33
:1
OK
Length to width ratio
18.33
.1
OK
Trash rack for overflow & orifice?
Y
(Y or N)
OK
Freeboard provided
2.00
it
OK
Vegetated filter provided?
Y
(Y or N)
OK
Recorded drainage easement provided?
NA
(Y or N)
OK
Capures all runoff at ultimate build -out?
Y
(Y or N)
OK
Drain mechanism for maintenance or emergencies
NA
Fonn SW401-Wet Detention Basin-Rev.4 Parts I & II. Design Summary, Page 2 of 2

LANDMARK ENGINEERING & ENVIRONMENTAL, P.C.
MAILING: P.O. Box 1 190 • KITTY HAWK. NC 27949
PHYSICAL: 8460 CARATOKE HWY. - SUITE 202 • POWELLS POINT, NC 27966
PHONE: [phone] • FAX: [phone] • EMAIL: OFFIC E9LAN DMARKENG. NET
Villas at the Pointe
Stormwater Management Plan
Revised Design Narrative
July 3, 2008
The above referenced project is a development of a 23 acre parcel into a multifamily
development consisting of 90 town home units and associated amenities and associated parking
and infrastructure. The project also proposes 2 professional office building and associated
infrastructure. The site is located off of US Highway 158 in Powells Point, Currituck County,
North Carolina.
The stormwater management plan consits of a single drainage area as per a telephone
conversation with Mr. Bill Moore of the Division of Water Quality. Stormwater runoff from
proposed impervious surfaces will be conveyed to the stormwater retention system via a
combination of sheet flow and stormwater catch basins/pipes and 2 conveyance decorative
ponds. The proposed Stormwater management system incorporates pipes to provide hydraulic
connections, of the conveyance ponds (ponds B and C). The entire system provide in excess of
the ten year two hour storm, conservatively assuming that 95% of all stormwater is conveyed to
the proposed wet detention pond system. The system is sized to draw down runoff from a 1 inch
storm in 3.18 days using a 3" orifice in the outlet. Provisions have also been designed to provide
an emergency outlet in the event of storms substantially over the design storm. system. The
temporary pool will be drawn down over time and be discharged out of the outlet control
structure through a vegetative filter before entering the Tig-Ma-Tar Ditch. The UDSA's Soil
Survey of Currituck County North Carolina maps the soils as a Portsmouth find sandy loam,
however field investigations of the soil indicate that the soil more closely resembles a Munden
loamy sand. The upper surface horizions are very acidic, creating a hard pan at a depth of
approximately 14 to 18 inches. Underneath this layer is a sand with moderate to rapid
permeability. Based on existing elevations at the site and both Landmark Engineering and
Protocol sampling Services investigations, a seasonal high water table elevation of 3.5 msl
(NAVD 88 datum) was calculated and used for design purposes.

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LANDMARK ENGINEERING & ENVIRONMENTAL, P.C.
MAILING: P.O. BOX 1 1 90 • KITTY HAWK, NC 27949
PHYSICAL: 8460 CARATOKE Hwy. — SUITE 202 • POWELLS POINT, NC 27966
PHONE: [phone] • FAX: [phone] • EMAIL: OFFICECaLANDMARKENG. NET
Villas at the Pointe
Orifice Drawdown Calculations
Design Storm = 1.0 inches
Design Storm Volume = 26,962.0 cu. ft.
3 inch orifice cross -sectional area = 0.0490873 sq. ft.
velocity through orifice = 2 ft/second
Flow through orifice = 0.0981746 cu. ft./ sec
Drawdown time for design storm = 26,962/0.0981746 = 274,633 seconds — 4,577 minutes
= 76.29 hours = 3.1786 days
Drawdown time is between 2days and 5 days for the design storm and is therefore acceptable.

LANDMARK ENGINEERING & ENVIRONMENTAL, P.C.
MAILING: P O. Box 1 1 90 • KITTY HAWK. NC 27949
PHYSICAL: 8460 CARATOKE HWY. — SUITE 202 • POWELLS POINT. NC 27966
PHONE: [phone] • FAX: [phone] • EMAIL: OFFICECaLANDMARKENG. NET
Villas at the Pointe
STORMWATER MANAGEMENT PLAN CALCULATIONS
Revised 7/3/08
Wet Detention basin A Contour Areas (Calculated by Autocad)
5.0' - 66,503 sq.ft. (Top of Storage @ Overflow Elevation)
4.0' - 57,631 sq. ft.
3.5' - 53,233 sq.ft. (Bottom of temporary storage)
Temporary Pool Volume
5.0' to 4.0' 1.0 ft x ((66,503 sq. ft. + 57,631 sq. ft.)/2) = 62,067 cu. ft.
4.0' to 3.5' 0.5 ft x ((57,631 sq. ft. + 53,233 sq. ft.)/2) = 27,716 cu. ft.
Direct Storage Wet Detention Basin A = 89,783 cu ft
Total impervious coverage = 323,548 sq. ft.
Assume 95% of runoff from impervious coverage reaches infiltration basins
tt,gnurrgr
89,783 cu. ft. /(0.95 x 323,548 sq. ft.) = 0.2921 ft. or 3.50 inches +'CQ ,N CAq`
Therefore storage is provided in excess of the design storm G�
Even if we conservatively assume 100% of runoff reaches basins Gt'tE '' ':•;
OR E
89,783 cu. ft. / 323,548 sq. ft. = 0.2775 It. or 3.33 inches rrrrrtrttt,a
Which is still well in excess of the design storm

;;
��
�Y `
'�f �'u+ •rL� rs iu��.
y'\• ...

Permit Number:
(to be provided by DWQ)
Drainage Area Number: I
Wet Detention Basin Operation and Maintenance Agreement
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, RECEIVED
pretreatment including forebays and the vegetated filter if one is provided.
Ws system (check one): APR 0 3 2008
J& does ❑ does not incorporate a vegetated filter at the outlet. DWQ-WARD
This system (check one): fl
Mdoes ❑ 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
tong.
approximately six inches.
Form SW401-Wet Detention Basin O&M-Rev.3 Page 1 of 4

Permit Number:
(to be provide! by DWQ)
Drainage Area Number: 11
BMP element:
Potentialproblem:
How I will remediate theproblem:
The inlet device: pipe or
The pipe is clogged.
Unclog the pipe. Dispose of the
swale
sediment off -site.
The pipe is cracked or
Replace the pipe.
otherwise damaged.
Erosion is occurring in the
Regrade the swale if necessary to
swale.
smooth it over and provide erosion
control devices such as reinforced
turf matting or riprap to avoid
future problems with erosion.
The forebay
Sediment has accumulated to
Search for the source of the
a depth greater than the
sediment and remedy the problem if
original design depth for
sediment storage.
possible. Remove the sediment and
dispose of it in a location where it
will not cause impacts to streams or
the BW.
Erosion has occurred.
Provide additional erosion
protection such as reinforced turf
matting or riprap if needed to
prevent future erosion problems.
Weeds are present
Remove the weeds, preferably by
hand. If pesticide is used, wipe it on
the plants rather than spraying.
The vegetated shelf
Best professional practices
Prune according to best professional
show that pruning is needed
practices
to maintain optimal plant
health.
Plants are dead, diseased or
Determine the source of the
dying.
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.
Weeds are present.
Remove the weeds, preferably by
hand. If pesticide is used, wipe it on
the plants rather than spraying.
The main treatment area
Sediment has accumulated to
Search for the source of the
a depth greater than the
sediment and remedy the problem if
original design sediment
possible. Remove the sediment and
storage depth.
dispose of it in a location where it
will not cause impacts to streams or
the BMP.
Algal growth covers over
Consult a professional to remove
50% of the area.
and control the algal growth.
Cattails, phragmites or other
Remove the plants by wiping them
invasive plants cover 50% of
with pesticide (do not spray).
the basin surface.
Form SW401-Wet Detention Basin O&M-Rev3 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.
Make all needed repairs.
An annual inspection by an
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 feet in the main pond, the
sediment shall be removed.
When the permanent pool depth reads '� . S feet in the forebay, the sediment
shall be removed.
Sediment Removal
Bottom
0-Pt I I
BASIN DIAGRAM
ill in the blanks)
/-ft Min.
Sediment
Storage
Permanent Pool Elevation 3 'St,
Pool
Po Sediment Removal Elevation -o S } Volume
---------------
--------------
--/
Bottom Elevation— I . S-A 2 1-ft Nry
Storage
FOREBAY
MAIN POND
Form SW401-Wet Detention Basin O&M-Rev.3 Page 3 of 4

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:
BMP drainage area number:
Print name: G f 1
Address: NfO 11a a�e1a-7
Phnne
1(4,09
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, k P-gv\PAk-\ rA • 1—i rJcl ptwl a Notary Public for the State of
I�oQAA, CA(tSQ Wi ) County of Ct -aVi 1-uCk , do hereby certify that
ER-i_G A -I) OLl'-\ personally appeared before me this
day of and acknowledge the due execution of the
forgoing wet detention basin maintenance requirements.
seal,
TAMMY J. FL.
INCHAM
Notary Public
North Carolina
Currituck County
SEAL
My commission expires `I - a lc-'9O 1 I
Witn ss my hand and official
U�
Form SW401-Wet Detention Basin O&M-Rev3 Page 4 of 4

Permit No.
_
(to be pmvnded by DWO)
O= � WATCgUG
\�
NCDENR
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATION APPLICATION FORM
WET DETENTION BASIN SUPPLEMENT
This form must be filled out, printed and submitted.
The Required Items Checklist (Part 111) must be printed, filled out and submitted along with all of the required information.
I. ;PROJECT INFORMATION
t = '' "
Project name
Villas at the Porte
Contact person
Victor White, P.E.
Phone number
252A91-2125 (office) 252-202-6460 (mobile)
Date
3/24/2008
Drainage area number
1
11.=DESIGN INFORMATION"
Site Characteristics
Drainage area
Impervious area
% Impervious
Design rainfall depth
Storage Volume: Non-SRWaters
Minimum volume required
Volume provided
Storage Volume: SR Waters
1-yr, 24-hr runoff depth
Pre -development 1-yr, 24-hr runoff
Post -development 1-yr, 24-hr runoff
Minimum volume required
Volume provided
Peak Flow Calculations
1-yr, 24-hr rainfall depth
Rational C, pre -development
Rational C, post -development
Rainfall intensity: 1-yr, 24-hr storm
Pre -development 1-yr, 24-hr peak flow
Post -development 1-yr, 24-hr peak flow
Pre/Post 1-yr, 24-hr peak flow control
Basin Elevations
Basin bottom elevation
Sediment cleanout elevation
Bottom of shelf elevation
Permanent pool elevation
SHWT elevation
Top of shelf elevation
Temporary pool elevation
1,003,276.00 ft'
323,548.00 ftz
32.25 %
1.UU in
26,962.00
450,194.00 It
NA In
NA ft'
NA ft'
#VALUE! ft'
NA ft'
3.31
in
0.15
(unllless)
0.38
(unllless)
0.14
infhr
0.48
l sec
010
ft'Isec
-0 39
ft'/sec
3 `
fit! APR 0 3 2008
DWQ-WARO
-2.00 ft f ��
-1.00 ft
3 00 ft � S 5
3 50 ft
3.50 It
4.00 It
500 If
Form SW401-Wet Detenbon Basm-Rev 4 Parts 18 11 Design Summary, Page 1 of 2

Permit No.
' (to be provided by DwO/
II. DESIGN INFORMATION .
-771
Volume and Surface Area Calculations
SA/DA ratio 2.70 (unitless)
Surface area at the bottom of shelf 58,254.00 f 2
Volume at the bottom of shelf 153,601.00 ffa r
Permanent pool, surface area required 27,088.00 ftz / �$ 3 5 .4 C"L'i
Permanent pool, surface area provided 87,631.00 ffz OK KA (�Q, //', p +
Permanent pool volume 190,073.00 ft' i, 0 n P. j
Average depth for SA/DA tablesx—i 2.17 It tttt���� Minimum of 3 ft required, Increase depth
Surface area at the top of shelf 95,921.00 ft' A+
Volume at the top of shelf 235,958.00 ft' /\ 1�'f A
]
Forebay volume 41,061 00 ft'
Forebay % of permanent pool volume 21.60 % OK
Temporary pool, surface area provided 112,707.00 ft'
Drawdown Calculations
Treatment volume drawdown time 3 18 days OK
Treatment volume discharge rate 0.10 ft3/s
Pre -development 1-yr, 24-hr discharge 0.48 ft3/s OK
Post -development 1-yr, 24-hr discharge 0.10 ft'/s OK
Additional Information
Diameter of orifice 3 in
Design TSS removal 11!!_� 90 %
Basin side slopes 4.00 :1 OK
Vegetated shelf slope 10.00 .1 OK
Vegetated shelf width 10.00 It OK
Length of flowpath to width ratio 18.33 :1 OK
Length to width ratio 18.33 :1 OK
Trash rack for overflow & odfce9 Y (Y or N) OK
Freeboard provided 2.00 It OK
Vegetated filter provided? Y (Y or N) OK
Recorded drainage easement provided? NA (Y or N) OK
Capures all runoff at ultimate build -out? Y (Y or N) OK
Drain mechanism for maintenance or emergencies NA
Form SW401-Wet Detention Basin -Rev 4 Parts I & 11, Design Summary, Page 2 of 2

Permit No.
(to be provided by DWQ)
III: REQUIRED ITEMS CHECKLIST `r ,. 7 7-
Please indicate the page or plan sheet numbers where the supporting documentation can be found. An incomplete submittal package will
result in a request for additional information. This will delay final review and approval of the project. Initial in the space provided to
indicate the following design requirements have been met. If the applicant has designated an agent, the agent may initial below. If a
requirement has not been met, attach justification.
Pagel Plan
Initials Sheet No.
VEW C2,C3
1. Plans (1" - 50' or larger) of the entire site showing:
- Design at ultimate build -out,
- Off -site drainage (if applicable),
- Delineated drainage basins (include Rational C coefficient per basin),
- Basin dimensions,
- Pretreatment system,
- High flow bypass system,
- Maintenance access,
- Proposed drainage easement and public right of way (ROW),
- Overflow device, and
- Boundaries of drainage easement.
VEW C6
2. Partial plan (1" = 30' or larger) and details for the wet detention basin showing:
- Outlet structure with trash rack or similar,
Maintenance access,
Permanent pool dimensions,
Forebay and main pond with hardened emergency spillway,
Basin cross-section,
Vegetation specification for planting shelf, and
Filter strip.
NA
NA
3. Section view of the dry detention basin (1" = 20' or larger) showing:
- Side slopes, 3:1 or lower,
- Pretreatment and treatment areas, and
- Inlet and outlet structures.
NA
NA
4. If the basin is used for sediment and erosion control during construction, clean out of the basin is specified
on the plans prior to use as a wet detention basin.
VEW
NARRICALC
5. A table of elevations, areas, incremental volumes & accumulated volumes for overall pond and for forebay,
to verify volume provided.
VEW
C4
6. A construction sequence that shows how the wet detention basin will be protected from sediment until the
entire drainage area is stabilized.
VEW
CALCS
7. The supporting calculations.
VEW
0&M
8. A copy of the signed and notarized operation and maintenance (0&M) agreement.
NA
NA
9. A copy of the deed restrictions (if required).
VEW SOILS 10. A soils report that is based upon an actual field investigation, soil borings, and infiltration tests. County
soil maps are not an acceptable source of soils information.
Form SW401-Wet Detention Basin-Rev.4 Part III. Required Items Checklist, Page i of i