SW7091205_CURRENT PERMIT_20100811

STORMWATER DIVISION CODING SHEET
POST -CONSTRUCTION PERMITS
PERMIT NO.
SW ZW�
DOC TYPE
CURRENT PERMIT
❑ APPROVED PLANS
❑ HISTORICAL FILE
❑ COMPLIANCE EVALUATION INSPECTION
DOC DATE6y��1
YYYYMMDD

NCDENR
North Carolina Department of Environment and Natural Resources
Division of Water Quality
Beverly,Eaves Perdue Coleen H. Sullins Dee Freeman
Governor Director Secretary
Mr. Douglas A. Twiddy
Twiddy Family Partnership, LLC
PO Box 369
Corolla, NC 27927
Subject: Stormwater Permit No. SW7091205 Modification
Twiddy Operations Building
High Density Project
Currituck County
Dear Mr. Twiddy:
The Washington Regional Office received a complete Stormwater Management Permit
Modification Application for Twiddy Operations Building on August 6, 2010. Staff review of the
plans and specifications has determined that the project, as proposed, will comply with the
Stormwater Regulations set forth in Session Law 2008-211 and Title 15A NCAC 2H.1000. We
are forwarding Permit No. SW7091205 Modification dated August 11, 2010, for the
construction of the subject project. 1, 13 1 /r/
This permit shall be effective from the date of issuance until August 11, 2020, shall void Permit
Number SW7091205 issued on December 18, 2009 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 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 Samir Dumpor, or me at [phone].
inc ly,
t..
AI Hod
Regional Supervisor
Surface Water Protection Section
AH/ so: S:\WQS\STORMWATER\PERMIT\SW7091205
cc: Andy Deel, PE, Quible & Associates, P.C.
Currituck County Building Inspections
I.\TVashington Regional Office
Central Files
North Carolina Division of Water Quality Internet: www.ncwmernuulity.ore
943 Washington Square Mall Phone: [phone] One
Washington, NC 27889 FAX [phone] NortljFF/C�`yd�ro/fi/na
An Equal Opportunity/Affirmative Action Employer- 50% Recycled110% Post Consumer Paper Natu Q([,il

State Stormwater Management Systems
Permit No. SW7091205 MOD
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
Twiddy Family Partnership, LLC
Twiddy Operations Building
Currituck County
FOR THE
construction, operation and maintenance of a Wetlands Basin and a Permeable
Pavement section in compliance with the provisions of Session Law 2008-211 and 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 11, 2020, and shall
be subject to the following specified conditions and limitations:
I. DESIGN STANDARDS
This permit is effective only with respect to the nature and volume of stormwater
described in the application and other supporting data.
This stormwater system has been approved for the management of stormwater
runoff as described in Section 1.7 of this permit. The stormwater control has been
designed to handle the runoff from 10,772 square feet of impervious area.
3. The tract will be limited to the amount of built -upon area indicated in Section I. 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.
The runoff from all built -upon area within the permitted drainage area of this
project must be directed into the permitted stormwater control system.
The built -upon areas associated with this project shall be located at least 50 feet
landward of all perennial and intermittent surface waters.
7. The following design criteria have been provided in the Wetlands Basin and must
Page 2 of 7

Permit No. SW7091205 MOD
be maintained at design condition
a.
Drainage Area, ftZ:
Wetlands Basin
18,803
b.
Total Impervious Surfaces, ft2:
10,772
C.
Design Storm, inches:
1.5
d.
Wetland Forebay Depth, feet:
1.5
e.
TSS removal efficiency:
85%
f.
Permanent Pool Elevation, FMSI :
2.50
9.
Permanent Pool Surface Areq, ft :
1,225
h.
Permitted Storage Volume, ft :
2,477
i.
Temporary Storage Elevation, FMSL:
3.50
j.
Controlling Orifice:
0.75" 0 pipe
k.
Permitted Forebay Surface Area, ftz:
324
I.
Receiving Stream/River Basin:
Currituck Sound
M.
Stream Index Number:
30-1
n.
Classification of Water Body:
"SC"
The
following design criteria have been provided in
the Permeable Pavement
and
must be maintained at design condition:
Permeable Pavement
a.
Soil type:
medium sands
b.
Infiltration rate in/hr:
2.00
C.
Seasonal High Water Table elev.:
2.50
d.
Surface Area of Permeable Pavement, ftz:
2,690
e.
Gravel base thickness, inches:
7.0
f.
Pervious credit factor:
60%
g.
Impervious area reduction, ft2:
1,614
h.
Bottom elevation of permeable pavement:
4.50
i.
Traffic volume (vehicles per day):
50
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 time 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 re -vegetation of slopes and the vegetated filter strip.
d. Immediate repair of eroded areas.
e. Maintenance of all slopes in accordance with approved plans and
specifications.
f. Debris removal and unclogging of outlet structure, orifice device, level
spreader, filter strip, catch basins and piping.
a. Access to the outlet structure must be available at all times
4. Records of maintenance activities must be kept for each permitted BMP. The
records will indicate the date, activity, name of person performing the work and
what actions were taken.
The permittee shall submit to the Division of Water Quality an annual summary
report of the maintenance inspection records for each BMP. The report shall
Page 3 of 7

State 5tormwater Management Systems
Permit No. SW7091205 MOD
summarize the inspection dates, results of the inspections, and the maintenance
work performed at each inspection.
6. Access to the stormwater facilities shall be maintained via appropriate
easements at all times.
7. The facilities shall be constructed as shown on the approved plans. This permit
shall become void unless the facilities are constructed in accordance with the
conditions of this permit, the approved plans and specifications, and other
supporting data.
8. 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.
9. 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.
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.
11. The Director may notify the permittee when the permitted site does not meet one
or more of the minimum requirements of the permit. Within the time frame
specified in the notice, the permittee shall submit a written time schedule to the
Director for modifying the site to meet minimum requirements. The permittee
shall provide copies of revised plans and certification in writing to the Director
that the changes have been made.
12. The permittee shall submit final site layout and grading plans for any permitted
future areas shown on the approved plans, prior to construction.
13. A copy of the approved plans and specifications shall be maintained on file by
the Permittee at all times.
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 completed Name/Ownership Change form, to the Division of Water
Quality, signed by both parties, and accompanied by supporting documentation
Page 4 of 7

Permit No. SW7091205 MOD
as listed on page 2 of the form. The project must be in good standing with the
Division. The approval of this request will be considered on its merits and may or
may not be approved.
2. The permittee is responsible for compliance with all permit conditions until such
time as the Division approves the transfer request.
3. 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.
4. 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.
5. 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.
6. 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.
7. The permit issued shall continue in force and effect until revoked or terminated.
The permit may be modified, revoked and reissued or terminated for cause. The
filing of a request for a permit modification, revocation and re -issuance or
termination does not stay any permit condition.
8. 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.
9. Approved plans and specifications for this project are incorporated by reference
and are enforceable parts of the permit.
10. The issuance of this permit does not prohibit the Director from reopening and
modifying the permit, revoking and reissuing the permit, or terminating the permit
as allowed by the laws, rules and regulations contained in Session Law 2008-
211, Title 15A NCAC 21-1.1000, and NCGS 143-215.1 et.al.
11. The permittee shall notify the Division of any name, ownership or mailing
address changes at least 30 days prior to making such changes.
12. This permit shall be effective from the date of issuance until August 11, 2020.
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 11th day of August, 2010.
NO T AROLINA ENVIRONMENTAL MANAGEMENT COMMISSION.
for
oleen H. ullins, Director '
Division of Water Quality
By Authority of the Environmental Management Commission
Stormwater Permit No. SW7091205 Modification
Page 5 of 7

State Stormwater Management Systems
Permit No. SW7091205 MOD
Twiddy Operations Building
Stormwater Permit No. SW7091205 Modification
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 6 of 7

Permit No. SW7091205 MOD
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 7 of 7

Quible
Quible & Associates, P.C.
ENGINEERING • ENVIRONMENTAL SCIENCES • PLANNING • SURVEYING
SINCE 1959
November 30, 2010
Mr. Samir Dumpor
Mr. Scott Vinson
NCDENR
Division of Water Quality
943 Washington Square Mall
Washington, North Carolina 27889
Re: Stormwater Management Permit
Stormwater Permit No. SW7091205MOD
Twiddy Operations Building
Dear Mr. Dumpor & Mr. Vinson:
DEC 0 2 2010
P,O, Drawer 870
KIHy Hawk NC 27949
Phone: [phone]DO
Fax: [phone]
Web. quale.com
PRINCIPALS
Eduardo J. WltlMeso, P.E.
Brian D. Rubino. PG.
Warren D. Eodm P.G.
ASSOCIATES
Joseph J. AnI P.E.
Dodd A, Deel, P.E.
Katherine C. Marohello. P.L.S.
Attached, for your records, please find an original copy of the Stormwater Designer's Certification for the
above referenced project.
If you need anything else, please do not hesitate to contact me at [phone].
Sincerely,
uible & Associates, .C.
avtd . Dcc

Permit No. SW7091205 MOD
Twiddy Operations Building
Stormwater Permit No. SW7091205 Modification
Currituck County
Designer's Certification
I, I Ja. id Del as a duly registered - in the
State&of North Carolina, having been authorized to obse (periodically/ weekly/ full
time) the construction of the project,
Ti,yir,4i;/ CIA or4yno,s •Ruilt4'lin
(Project) . , ..
for Tu,r „ I'an)4 Pal4tepp, L1,L (Project Owner) hereby state that, to the
best of my abilities,"due care and diligence vvas used in the observation of the project
construction such that the construction was,observedto 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.
v
Noted deviations from approved plans and specification:-'
SEAL
'g6pF14i����Q .
Signature
Registration Number o251, RA �� a
4 SEALS
Date (��/o Q25158 ••�
•.tip: .� `/`
4 .
Page 6 of 7

Permit No. SW7091205 MOD
Certification Requirements:
_1.
The drainage area to the system contains approximately the permitted
acreage.
D�D _2.
The drainage area to the system contains no more than the permitted
amount of built -upon area.
N3.
All the built -upon area associated with the project is graded such that the,
runoff drains to the system.
DAD4.
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.
�AD_6.
The outlet structure is located per the approved plans.
7.
Trash rack is provided on the outlet/bypass structure.
DAD 8. :..
. All slopes are grassed -with permanent vegetation. -Seeded. 6rrass area; will be mooi
fargrevcd{ln a�cf re 3 %c( as necesvey
fLD 9.
Vegetated slopes are no steeper than 3:1. b &1�5fabfi3h propel groUA�4Loved-
iav_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.
DflD 13.
All required design depths are provided.
f nAD 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
WA(w<)
pict ,kings kQve been t„:>611 c( a„cf wi I / be mom fore For groat{� {l rc �
tie wi4e.'
arc{ ii4o Ike spI�g Planfinq season uHli JLt( es(ab(i.�,ed .
Page 7 of 7

OF/W A�TFH
NCDENR o/`ry�JW`7�r T
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATION APPLICATION FORM
WETLAND SUPPLEMENT
This form must be filled out, printed and submitted.
The Required Items Checklist (Part III) must be printed, filled out and submitted along with all the required information.
I. PROJECT INFORMATION
Project name Twiddy Operations Building
Contact name David A. Deal
Phone number [phone]
Date June 10, 2010
Drainage area number 1
II. DESIGN INFORMATION
Site Characteristics
Drainage area
18,803.00 it,
Impervious area
10,772.00 ft2
Percent impervious
57.3% % ✓✓
Design rainfall depth
1.50 inch
Peak Flow Calculations
1-yr, 24-hr rainfall depth
3,11 in
1-yr, 24-hr intensity
in/hr
Pre -development 1-yr, 24-hr runoff
0, 3S 1S ft3/sec from X P3I`0rrn MOM
Post -development 1-yr, 24-hr runoff
0111. 3 1 ft3/sec
Pre/Post 1-yr, 24-hr peak control
0 Z33 ft3/sec
Storage Volume: Non -SA Waters
Minimum required volume
1,810.00 to
Volume provided (temporary pool volume) 2,477.00 it ✓ OK
Storage Volume: SA Waters Parameters
1.5" runoff volume ft3
Pre -development 1-yr, 24-hr runoff volume it
Post -development 1-yr, 24-hr runoff volume If
Minimum volume required If
Volume provided If
Outlet Design
Depth of temporary pool/ponding depth (Dpa„J
12.00 in
OK
Drawdown time
3.88 days kl
OK
Diameter of orifice
0.75 in I✓
OK
Coefficient of discharge (Co) used in orifice diameter
0.60 (unitless)
calculation
Driving head (He) used in the orifice diameter calculation
0.50 ft
OK
Form SW401-Wetland-Rev.6-11/16/09 Parts I and 11. Project Design Summary, Page 1 of 3

Surface Areas of Wetland Zones
Surface Area of Entire Wetland
3,103.00 f?
OK
Shallow Land
1,252.00 jf`
P�oPor ct l%w
The shallow land percentage is:
40%%
sGn
Ialx� /7:, A01Z o Icf(cct/.
Shallow Water
1,225.00 fe
OK
The shallow water percentage is:
39% %
Deep Pool
Forebay portion of deep pool (pretreatment)
324.00 If
OK
The forebay surface area percentage is:
10% %
Non-forebay portion of deep pool
302.00 It
OK
The non-forebay deep pool surface area percentage is:
10% %
Total of wetland zone areas
3,103.00 ft2
OK
Add or subtract the following area from the zones
0.00 fe
Topographic Zone Elevations
Temporary Pool Elevation (TPE)
Shallow Land (top)
3.50 ft amsl
Permanent Pool Elevation (PPE)
Shallow Water/Deep Pool (top)
2.50 it amsl
Shallow Water bottom
2.00 It amsl
Most shallow point of deep pool's bottom
1.00 If amsl
Deepest point of deep pool's bottom
1.00 If amsl
Design must meet one of the following two options:
This design meets Option N1,
Y (Y or N)
Top of PPE is within 6' of SHWT, If yes:
SHWT (Seasonally High Water Table)
2.50 If amsl
OK
This design meets Option N2,
(Y or N)
Wetland has liner with permeability <0.01 in/hr, If yes:
Depth of topsoil above impermeable liner
in
Topographic Zone Depths
Temporary Pool
Shallow Land
12.00 in
OK
Permanent Pool
Shallow Water
6.00 in
OK
Deep Pool (shallowest)
18.00 in
OK
Deep Pool (deepest)
18.00 in
OK
Planting Plan
Are cattails included in the planting plan?
N (Y or N)
OK
Number of Plants recommended in Shallow Water Area:
Herbaceous (4'cubic-inch container)
350
Number of Plants recommended in Shallow Land Area:
Herbaceous (4'cubic-inch container), OR
350
Shrubs (1 gallon or larger), OR
56
Trees (3 gallon or larger) and Herbaceous (4+cubic-inch)
7 and
280
Number of Plants provided in Shallow Water Area:
Herbaceous (4'cubic-inch container)
N/A
OK
Number of Plants orovided in Shallow Land Area:
Herbaceous (4'cubic-inch container)
N/A
OK
Shrubs (1 gallon or larger)
N/A
OK
Trees (3 gallon or larger) and
N/A
OK
Grass -like Herbaceous (4+cubic-inch)
N/A
OK
Form SW401-Wetland-Rev.6-11/16/09 Pans I and 11. Project Design Summary, Page 2 of 3

Additional Information
Can the desigri volume be contained?
Y (Y or N)
OK
Does project drain to SA waters? If yes,
N (Y or N)
Excess volume must pass through filter.
What is the length of the vegetated filter?
30.00 ft
Are calculations for supporting the design volume provided in the
Y or N Y
( )
OK
application?
Is BMP sized to handle all runoff from ultimate build -out?
Y (Y or N)
OK
Is the BMP located in a recorded drainage easement with a
N/A (Y or N)
Insufficient ROW location.
recorded access easement to a public Right of Way (ROW)?
The length to width ratio is:
1.66 :1
OK
Approximate wetland length
116.00 it
Approximate wetland width
70,00 ft
Approximate surface area using length and width provided
8,120.00 flz
This approx. surface area is within this number of square feet
of the entire wetland surface area reported above:
Will the wetland be stabilized within 14 days of construction?
Y (Y or N)
OK
Form SW401 -W etland-Rev.6-11/16/09 Parts I and 11. Project Design Summary, Page 3 of 3

Permit
(to be provided by DWQ)
111. 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.
Initials Page/ Plan
Sheet No.
�Af) 1. Plans IV - 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),
Wetland dimensions (and length to width ratio),
Pretreatment system,
Maintenance access,
Proposed drainage easement and public right of way (ROW),
Overflow device, and
Boundaries of drainage easement.
AD— P b0692. Plan details (1" = 50' or larger) for the wetland showing:
- Wetland dimensions (and length to width ratio)
Pretreatment system,
Maintenance access,
Proposed drainage easement and public right of way (ROW),
Design at ultimate build -out,
Off -site drainage (if applicable),
Overflow device, and
Boundaries of drainage easement.
IV &Ng 6h 3. Section view of the wetland (1' = 20' or larger) showing:
Side slopes, 3:1 or lower
Wetland layers
All wetlands: Shallow land depth, shallow water depth, deep pool depth
Option 1, no clay liner: SLWT depth
Option 2, clay liner: Depth of topsoil on top of liner, liner specifications
UO &43&L6B 4. A detailed planting plan (1" = 20' or larger) prepared by a qualified individual showing:
A variety of several suitable species (not including cattails),
Sizes, spacing and locations of plantings,
Total quantity of each type of plant specified,
A planting detail,
The source nursery for the plants, and
Fertilizer and watering requirements to establish vegetation.
6d 1 — ;Hart 54 Q 5. A construction sequence that shows how the wetland will be protected from sediment until the entire
drainage area is stabilized.
ur-u— A&_4,e�_ 6. The supporting calculations (including drawdown calculations).
UBb—_ IyAcki -L 7. A copy of the signed and notarized operation and maintenance (0&M) agreement
Sh�_ N /A 8. A copy of the deed restrictions (if required).
4td0ka if
DW-- Jfub ' 9. A soils report that is based upon an actual field investigation and soil borings. County soil maps are not an
acceptable source of soils information.
SW401-Wetland-Rev.6-11/16/09 Part III, page 1 of 1

_ ';
Permit
(to be provided by DWO)
o2oFWATfgy
®p� STORMWATER MANAGEMENT PERMIT APPLICATION FORM o�
NCDENR 401 CERTIFICATION APPLICATION FORM
PERMEABLE PAVEMENT 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.
jl. PROJECT INFORMATION
Project Name
Twiddy Operations Building
Contact Person
David A. Deel, P.E.
Phone Number
[phone]
Date
18-Jun-10
Drainage Area I Lot Number
1
Lot Owner's Signature
II. DESIGN INFORMATION
Soils Report Summary
Soil type
medium sands
Infiltration rate
2.00 in/hr OK
SHWT elevation
2.50 fmsl
Credit Calculation- Enter an in the appropriate cell below
Within 1/2 mile of & draining to SA waters?
Permeable concrete without a gravel base
Permeable concrete with at least 6' gravel base
Flexible pavements with at least 4" gravel base
Flexible pavements with at least 7' gravel base
Bottom elevtion of the permeable pavement cross-section
SA of permeable pavement being proposed
Resulting BUA counted as impervious
n Y/N
x
4.50 fmsl
2,690.00 (f2
1,076.00 ft2
Managed Grass Factor:
0.6
OK
ao/ C,K
Additional Information
Slope of permeable pavement
0.50
%
OK
Construction sequence minimizes compaction to soils?
y
Y/N
OK
Traffic volume (vehicles per day)
50.00
v/day
OK
Washed stone is specified for the gravel layer (if used)?
y
Y/N
OK
Concetrated flow from roofs & other surfaces directed away?
y
YIN
OK
Additional Information for Residential Lots Only
Total BUA allocated to this lot
ft2
Remaining lot BUA available
n2
Application Approved
Application Rejected
Reason for rejecting application:
Signature of permittee / HOA:
Date
Farm SW401-Permeable Pavement-Rev.t Pans I. a II. Design Summary, Page 1 of 1

Permit
III. REQUIRED ITEMS CHECKLIST
(to be provided by DWQ)
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.
J)�D p(u. �F a 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),
Location of permeable pavement,
Roof and other surface flow directed away from permeable pavement,
W pkl h 5k}S
DAD prBOSa F}Fl
VW_ P(tI0_kL+
Example #1
2. Section view of the permeable pavement (1" = 20' or larger) showing:
Layers, and
SHWT
3. A soils report that is based upon an actual field investigation, soil borings, and infiltration tests. The
results of the soils report must be verified in the field by DWQ, by completing & submitting the soils
investigation request form. County soil maps are not an acceptable source of soils information.
4. A construction sequence that shows how the permeable pavement will be protected from sediment until
the entire drainage area is stabilized.
5. The supporting calculations.
6. A copy of the signed and notarized operation and maintenance (OW) agreement.
7. A copy of the deed restrictions (if required).
Project is a lot with a maximum allowed BUA of 5,000 sq. ft. that drains to class SC waters.
Project proposes a 1,000 sq. ft. permeable concrete driveway with a 6" gravel base.
Managed grass factor = 0.6
1000 x 0.6 = 600 square feet is counted as managed grass.
1000 - 600 = 400 square feet is counted as built -upon area.
5000 - 400 = 4,600 square feet available for house and other BUA.
Example #2
Project is a high density commercial site with a 5,000 square foot parking lot.
Project is within 1/2 mile of and draining to SA waters. An infiltration system is proposed.
The parking lot will handle <100 cars per day and is a flexible pavement with a 4" gravel base.
Managed grass factor is one half of 0.4. = 0.2
5000 x 0.2 = 1000 square feet is counted as managed grass.
5000 - 1000 = 4,000 square is counted as impervious.
The total BUA used to calculate the minimum volume draining to the
infiltration system can be reduced by 1,000 square feet.
Form SW401-Permeable Pavement-Rev.1 Page 1 of 1 Part III. Required Items Checklist, Page 1 of 1

Permit Number:
(to be provided by DWQ)
Drainage Area / Lot Number:
Permeable Pavement 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.
Important operation and maintenance procedures:
— Stable groundcover will be maintained in the drainage area to reduce the sediment
load to the permeable pavement.
— The area around the perimeter of the permeable pavement will be stabilized and
mowed, with clippings removed.
— Any weeds that grow in the permeable pavement will be sprayed with pesticide
immediately. Weeds will not be pulled, since this could damage the fill media.
— Once a year, the permeable pavement surface will be vacuum swept.
— At no time shall wet sweeping (moistening followed by sweeping) be allowed as a
means of maintenance.
— There shall be no repair or treatment of Permeable Pavement surfaces with other
types of pavement surfaces. All repairs to Permeable Pavement surfaces must be
accomplished utilizing permeable pavement which meets the original pavement
specifications.
— Concentrated runoff from roof drains, piping, swales or other point sources,
directly onto the permeable pavement surface shall not be allowed. These areas
must be diverted away from the permeable pavement.
Initial Inspection: Permeable Pavements shall be inspected monthly for the first three
months for the following:
BMP element:
Potentialproblem:
How to remediate theproblem:
The perimeter of
Areas of bare soil and/or
In the event that rutting or failure of the groundcover
the permeable
erosive gullies have
occurs, the eroded area shall he repaired immediately
pavement
formed.
and permanent groundcover re-estahli shed.
Appropriate temporary Erosion Control measures (such
as silt fence) shall be installed in the affected area
during the establishment of permanent groundcover,
and any impacted area of permeable pavement is to be
cleaned via vacuum sweeping.
The surface of the
Rutting / uneven
This indicates inadequate compaction of the pavement
permeable
settlement
base / sub -base. If rutting or uneven settlement on the
pavement
order of/z inch or greater occurs, permeable pavement
shall he removed and base / sub -base re -compacted,
smoothed, and permeable pavement shall then be re-
installed. Base and sub -base compaction shall be
monitored by a licensed geotechnical engineer to ensure
that infiltration capacity of hase and sub -base are not
com romised b compaction and smoothing processes.
The pavement does not
,Vasa . If the pavement still
dewatcr between storms,
(does not dewater, consult a professional.
or water is runningolf.
��� Renlcre, redtme„f htden Paue( aacl rr kuce W cja
lNue/
Form SW401-Permeahle Pavement O&M-Rev3 Page I of 3

Permit Number:
(to be provided by DWQ)
Drainage Area / Lot Number:
The permeable pavement will be inspected once a quarter 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 will be kept in a known set location and will be
available upon request.
Inspection activities shall be performed as follows. Any problems that are found shall
be repaired immediately.
BMP element:
Potentialproblem:
How to remediate theproblem:
The perimeter of the
Areas of bare soil and/or erosive
Regrade the soil if necessary to remove
permeable pavement
gullies have formed.
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
long.
Maintain vegetation at a height of 3 to 6
inches (remove clippings).
The surface of the
Trash/debris is present.
Remove the trash/debris.
permeable pavement
Weeds are growing on the
Do not pull the weeds (may pull out
surface of the permeable
media as well). Spray them with
uvement.
pesticide.
Sediment is present on the
wemem ZeMev& se
surface.
(eaten auel t fe acE W clean Pave( .
The structure is deteriorating or
Consult an appropriate professional.
damaged.
Damaged areas of the pavement shall be
removed and repaired.
The pavement does not dewater
Yasuuai-4wecp4lre.pavernem. If the
between storms.
pavement still does not dewater, consult
a professional. Permanently clogged
pavement shall be removed and
repaired.
Remove sedi,„et{ laden replace
w�clea.. gPa,:e�
ilmeJ
Form SW401-Permcahle Pavement O&M-Rev.3 Page 2 of 3

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:Twiddy Operations Building
BMP drainage area or lot number. I _
Print name:Douglas A. Twiddv
Title:Managing Member. Twiddv Family Partnership
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• ,�/�" ` ` a Notary Public for the State of
n _,County of do hereby certify that
�0 K r`1 • � &nbt personally appeared before me this ZZ'
day of aO�and acknowledge the due execution of the
forgoing permeable pavement maintenance requirements. Witness my hand and official
seal,
My commission expires j� -� 015
Form SW401-Permeable Pavement O&M-Rev.3 Page 3 of 3

d
DWQ USE ONLY
Date Recciv
Fee Paid C" I tf
Permit Number
Applicable Reties: ❑ Coastal SW —1995 oastal SW — 2008 ❑ Ph II - Post Construction
(select all thaQrFj�Jfi IMn-Coastal SW- HQW/ORW Waters ❑ Universal Stormwater Management Plan
❑ Other WQ M mt Plan:
kip r1rWme
State of North Carolina
Department of Environment and Natural Resources
Division of Water Quality
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
This form may be photocopied for use as an original
1. GENERAL INFORMATION
1. Project Name (subdivision, facility, or establishment name -should be consistent with project name on plans,
specifications, letters, operation and maintenance agreements, etc.):
Twiddy Family Partnership LLC
2. Location of Project (street address):
1141 and 1143 Persimmon Street
City:Corolla County:Currituck Zip:27948
3. Directions to project (from nearest major intersection):
Project is located on the north side of Persimmon Street approximately 310 feet east of the intersection of
Persimmon Street and Corolla Village Road
4. Latitude:36° 22' 49.73" N Longitude:75° 49' 55.32" W of the main entrance to the project.
IL PERMIT INFORMATION:
1. a. Specify whether project is (check one): ®New ❑Modification
b.If this application is being submitted as the result of a modification to an existing permit, list the existing
permit number , its issue date (if known) and the status of
construction: ❑Not Started ❑Partially Completed* ❑ Completed* *provide a designer's certification
2. Specify the type of project (check one):
❑Low Density ®High Density ❑Drains to an Offsite Stormwater System ❑Other
3. If this application is being submitted as the result of a previously returned application or a letter from DWQ
requesting a state stormwater management permit application, list the stormwater project number, if
assigned, and the previous name of the project, if different than currently
proposed,
4. a. 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):
❑LAMA Major
❑NPDES Industrial Stormwater
QSedimentation/Erosion Control: 0.94 ac of Disturbed Area
W404/401 Permit: Proposed Impacts
b.If any of these permits have already been acquired please provide the Project Name, Project/Permit Number,
issue date and the type of each permit:n/a
FormSWU-101 Version07Ju112009 Page I of

III. CONTACT INFORMATION
1. a. Print Applicant / Signing Official's name and title (specifically the developer, property owner, lessee,
designated government official, individual, etc. who owns the oroiect):
Applicant/Organization:Twiddv Family Partnership LLC
Signing Official & Title:Douglas A. Twiddy, Managing Member
b.Contact information for person listed in item la above:
Street Address:
City:
State:
Mailing Address (if applicable):P.O. Box 369
City:Corolla State:NC Zip:27927
Phone: (252 ) 457-1177 Fax:
c. Please check the appropriate box. The applicant listed above is:
® The property owner (Skip to Contact Information, item 3a)
❑ Lessee* (Attach a copy of the lease agreement and complete Contact Information, item 2a and 2b below)
❑ Purchaser* (Attach a copy of the pending sales agreement and complete Contact Information, item 2a and
2b below)
❑ Developer* (Complete Contact Information, item 2a and 2b below.)
2. a. Print Property Owner's name and title below, if you are the lessee, purchaser or developer. (This is the
person who owns the property that the project is located on):
Property Owner
Signing Official &
b.Contact information for person listed in item 2a above:
Street Address:
City:
Mailing Address (if
Phone:
State:
Fax: ( 1
3. a. (Optional) Print the name and title of another contact such as the project's construction supervisor or other
person who can answer questions about the project:
Other Contact Person
Signing Official &
b.Contact information for person listed in item 3a above:
Mailing Address:
City: State:
Form SWU-101 Version 07July2009 Page 2 of 7

Phone:
Fax:
4. Local jurisdiction for building permits: Currituck County
Point of Contact:Mr. Ben Woody, Planning Director
IV. PROJECT INFORMATION
Phone #: (252 ) 232-3055
1. In the space provided below, briefly summarize how the stormwater runoff will be treated.
Stormwater from impervious surfaces will be collected via curb and gutter and storm sewer and conveyed
to a constructed wetland for treatment.
2. a. If claiming vested rights, identify the supporting documents provided and the date they were approved:
❑ Approval of a Site Specific Development Plan or PUDApproval Date:
❑ Valid Building Permit Issued Date:
❑ Other: Date:
b.Identify the regulation(s) the project has been designed in accordance with:
® Coastal SW —1995 ❑ Ph lI — Post Construction
3. Stormwater runoff from this project drains to the Pasquotank River basin.
4. Total Property Area: 0.57 acres
5. Total Coastal Wetlands Area: n/a acres
6. Total Surface Water Area: n/a acres
Total Property Area (4) — Total Coastal Wetlands Area (5) — Total Surface Water Area (6) = Total Project Area':
0.57 acres
Total project area shall be calculated to exclude the following: the normal pool of impounded structures, the area
between the banks of streams and rivers, the area below the )Jornwl High Water (NHW) line or Mean High Water
(MHW) line, and coastal wetlands landward from the NHW (or MHO) line. The resultant project area is used to
calculate overall percent built upon area (BUA). Non -coastal wetlands landward of the NIIW (or MHW) Iine may be
included in the total project area.
8. Project percent of impervious area: (Total Impervious Area / Total Project Area) X 100 = 49.8 '%
9. How many drainage areas does the project have?1 (For high density, count 1 for each proposed engineered
stormwater BMP. For low density and other projects, use 1 for the whole property area)
10. Complete the following information for each drainage area identified in Project Information item 9. If there
are more than four drainage areas in the project, attach an additional sheet with the information for each area
provided in the same format as below.
Form SWU-101 Version 07July2009 Page 3 of 7

Basin Information
Draina e Area _
Draina e Area _
Draina e Area _
Draina e.A" ea
Receiving Stream Name
Currituck Sound
Stream Class
SC
Stream Index Number *
30-1
Total Drainage Area (sf)
18,803 sf
On -site Drainage Area (sf)
18,803 sf
Off -site Drainage Area (sf)
0 sf
Pro osed Impervious Area** (sf)
12,386 sf
% Impervious Area** (total)
65.9
11�'A
Impervious— Surface Area
Draina e Area _
Dr ' a e Area _
Draina e Area _
Draina e Area _
On -site Buildings/Lots (sf)
4,069 sf
On -site Streets (sf)
n/a
On -site Parking (sf)
8,317 sf
On -site Sidewalks (sf)
n/
Other on -site (sf)
/a
Future (sf)
n/a
Off -site (sf)
n/a
Existing BUA*** (sf)
n/a
Tot a f):
12,386 sf
Stream Class and Index Number can be determined at:http:/At2o.enr.state.tic.us/bints/reports/reportsWB htntl
/inppervious area is defined as the built upon area including, but not Iitnited to, buildings, roads, parking areas,
sidetaalks, gravel areas, etc.
Report only that mnount of existing BUA that Will remain after development. Do not report any existing BUA that is
to be removed and which will be replaced by new BUA.
11. How was the off -site impervious area listed above determined? Provide documentation.
Proieets in Union County: Contact DWQ Central Office staff to check if the project is located within a Threatened &
Endangered Species watershed that may be subject to more stringent storanvater requirements as per NCAC 028.0600.
V. SUPPLEMENT AND O&M FORMS
The applicable state stormwater management permit supplement and operation and maintenance (O&M) forms
must be submitted for each BMP specified for this project. The latest versions of the forms can be downloaded
fromlittl2://h2o.enr.state.nc.us/su/bmp forms.htm.
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. A detailed application instruction sheet and BMP
checklists are available from http://h2o.enr.state.nc.us/su/bmp forms.htm. The complete application package
should be submitted to the appropriate DWQ Office. (The appropriate office maybe found by locating project
on the interactive online map at http://h2o.enr.state.nc.us/su/msi maps.htm.)
Please indicate that the following required information have been provided by initialing in the space provided for
each item. All original documents MUST be signed and initialed in blue ink. Download the latest versions for
each submitted application package from http://h2o.enr.state.nc.us/su/bmp forms.htm.
Initials
1. Original and one copy of the Stormwater Management Permit Application Form.
2. Original and one copy of the signed and notarized Deed Restrictions &Protective Covenants
Form. (if required as per Part VII below)
3. Original of the applicable Supplement Form(s) (sealed, signed and dated) and O&M�
agreement(s) for each BMP.
4. Permit application processing fee of $505 payable to NCDENR. (For an Express review, refer to�
http://www.envhelp.org/12ages/­onestopexl2ress.htmi for information on the Express program
and the associated fees. Contact the appropriate regional office Express Permit Coordinator for
additional information and to schedule the required application meeting.)
Form SWU-101 Version 07July2009 Pagc4 of7

5. A detailed narrative (one to two pages) describing the stormwater treatment/management for
the project. This is required in addition to the brief summary provided in the Project
Information, item 1.
6. A USGS map identifying the site location. If the receiving stream is reported as class SA or the
receiving stream drains to class SA waters within 1h mile of the site boundary, include the'k
mile radius on the map.
7. Sealed, signed and dated calculations.
8. Two sets of plans folded to 8.5" x 14" (sealed, signed, & dated), including:
a. Development/Project name.
b. Engineer and firm.
c. Location map with named streets and NCSR numbers.
d. Legend.
e. North arrow.
f. Scale.
g. Revision number and dates.
h. Identify all surface waters on the plans by delineating the normal pool elevation of
impounded structures, the banks of streams and rivers, the MHW or NHW line of tidal
waters, and any coastal wetlands landward of the MHW or NHW lines.
• Delineate the vegetated buffer landward from the normal pool elevation of impounded
structures, the banks of streams or rivers, and the MHW (or NHW) of tidal waters.
i. Dimensioned property/project boundary with bearings & distances.
j. Site Layout with all BUA identified and dimensioned.
k. Existing contours, proposed contours, spot elevations, finished floor elevations.
1. Details of roads, drainage features, collection systems, and stormwater control measures.
m. Wetlands delineated, or a note on the plans that none exist. (Must be delineated by a
qualified person. Provide documentation of qualifications and identify the person who
made the determination on the plans.
n. Existing drainage (including off -site), drainage easements, pipe sizes, runoff calculations.
o. Drainage areas delineated (included in the main set of plans, not as a separate document).
p. Vegetated buffers (where required).
9. Copy of any applicable soils report with the associated SHWT elevations (Please identify Mp
elevations in addition to depths) as well as a map of the boring locations with the existing
elevations and boring logs. Include an 8.5"x1l" copy of the NRCS County Soils map with the
project area clearly delineated. For projects with infiltration BMPs, the report should also
include the soil type, expected infiltration rate, and the method of determining the infiltration rate.
(Infiltration Devices submitted to WiRO: Schedule a site visit for DWQ to verify the SHWT prior
to submittal, [phone].)
10. A copy of the most current property deed. Deed book: 1068 Page No: 649 & 670 -DA))
11. For corporations and limited liability corporations (LLC): Provide documentation from the NC _DAD
Secretary of State or other official documentation, which supports the titles and positions held
by the persons listed in Contact Information, item la, 2a, and/or 3a per NCAC 2H.1003(e). The
corporation or LLC must be listed as an active corporation in good standing with the NC
Secretary of State, otherwise the application will be returned.
http•//www.secretary.state.nc.us /Corporations/ CSearchas nix
VIL DEED RESTRICTIONS AND PROTECTIVE COVENANTS
For all subdivisions, outparcels, and future development, the appropriate property restrictions and protective
covenants are required to be recorded prior to the sale of any lot. If lot sizes vary significantly or the proposed
BUA allocations vary, a table listing each lot number, lot size, and the allowable built -upon area must be provided
as an attachment to the completed and notarized deed restriction form. The appropriate deed restrictions and
protective covenants forms can be downloaded from
http://h2o.enr.state.nc.us/su/bmp forms.htm#deed restrictions. Download the latest versions for each submittal.
In the instances where the applicant is different than the property owner, it is the responsibility of the property
owner to sign the deed restrictions and protective covenants form while the applicant is responsible for ensuring
that the deed restrictions are recorded.
By the notarized signature(s) below, the permit holder(s) certify that the recorded property restrictions and
protective covenants for this project, if required, shall include all the items required in the permit and listed
on the forms available on the website, 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 NC DWQ, and that they will be recorded prior to the sale of any lot.
Form SWU-101 Version 07July2009 Page 5 of 7

Vill. CONSULTANT INFORMATION AND AUTHORIZATION
Applicant: Complete this section if you wish to designate authority to another individual and/or firm (such as a
consulting engineer and/or firm) so that they may provide information on your behalf for this project (such as
addressing requests for additional information).
Consulting Engineer:David A. Deel, P.E.
Consulting Firm: Quible & Associates. P.C.
Mailing Address:P.O. Drawer 870
City:Kitty Hawk State:NC Zip:27949
Phone: (252 ) 261-3300
Email:[e-mail]
Fax: (252 ) 261-1260
IX. PROPERTY OWNER AUTHORIZATION (if Contact Information, item 2 has been filled out, complete this
section)
I, (print or type name of person listed in Contact Information, item 2a) certify that I
own the property identified in this permit application, and thus give permission to (print or type name of person
listed in Contact Information, item la) with (print or type name of organization listed in
Contact Information, item lb) to develop the project as currently proposed. A copy of
the lease agreement or pending property sales contract has been provided with the submittal, which indicates the
party responsible for the operation and maintenance of the stormwater system.
As the legal property owner I acknowledge, understand, and agree by my signature below, that if my designated
agent (entity listed in Contact Information, item 1) dissolves their company and/or cancels or defaults on their
lease agreement, or pending sale, responsibility for compliance with the DWQ Stormwater permit reverts back to
me, the property owner. As the property owner, it is my responsibility to notify DWQ immediately and submit a
completed Name/Ownership Change Form within 30 days; otherwise I will be operating a stormwater treatment
facility without a valid permit. I understand that the operation of a stormwater treatment facility without a valid
permit is a violation of NC General Statue 143-215.1 and may result in appropriate enforcement action including
the assessment of civil penalties of up to $25,000 per day, pursuant to NCGS 143-215.6.
a Notary Public for the State of
do hereby certify that
before me this _ day of
stormwater permit. Witness my hand and official seal,
SEAL
County of
personally appeared
and acknowledge the due execution of the application for a
My commission
Form SWU-101 Version 071uly2009 Page 6 of 7

X. 'APPLICANT'S CERTIFICATION
1, (print or type name of son listed it Contact Information, itent 2) Douglas A. Tmiddu
certify that the inlor olio includ on permit application form is, to the best of my knowledge, correct and
that the project will be con tructe m c formance with the approved plans, that the required deed restrictions
and protective covenants ill b iec ded, and that the proposed project complies with the requirements of the
applicable stormwater es t er A N , C 2H .1000, SL 2006-246 (Ph. 11-Post Construction) or SL 2008-211.
Signature:
before me this
stormwater permit.
{/ �_
Date: O "
a Notary Public for the State of County of
_ do hereby certify that 12)© personally appeared
ay of ��Oy✓14 iel� o�. and a tub} ledge th du executie�n o e application for a
/��Witness my hand and official seal, %
A
ue `eIL.
yr 0UWIv
SEAL
My commission expires a�_ • /3 C:;D'(9/0
7
Form SWU-101 Version 071uly2009 Page 7 of 7

®R
NCDENR
EXPRESS
DEC 1;0 Z009
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
NC DENR 401 CERTIFICATION APPLICATION FORM
WETLAND SUPPLEMENT
This form must be filled out, printed and submitted.
The Required Items Checklist (Part III) must be printed, filled out and submitted along with all the required information
11. PROJECT INFORMATION
Project name Twiddy Operations Building
Contact name David A. Dee], P.E.
Phone number [phone]
Date December 7, 2009
Drainage area number 1
0 OF WArf; O,
9
� r
o
II. DESIGN INFORMATION
Site Characteristics
Drainage area
18,803.00 ft2 ✓
Impervious area
12,386.00 ft2
Percent impervious
65.9%%
Design rainfall depth
1.50 inch
Peak Flow Calculations
IYyr, 24-hr rainfall depth
in
l Q-yr, 24-hr intensity
in/hr
Pre-developmenl,l'yr, 24-hr runoff
1.17 ft'/sec
Post -development) yr, 24-hr runoff
0,4�2_ ft3/sec
Pre/Post 1-yr, 24-hr peak control
ft3/sec
Storage Volume: Non -SA Waters
Minimum required volume
2,046.00 it3
Volume provided (temporary pool volume) 3,552.00 it OK
Storage Volume: SA Waters Parameters
1.5 runoff volume
ft3
Pre -development 1-yr, 24-hr runoff volume
it
Post -development 1-yr, 24-hr runoff volume
to
Minimum volume required
it
Volume provided
rya
Outlet Design
Depth of temporary pool/ponding depth (Dp,jJ
12.00 in OK
Drawdown time
2.22 days OK
Diameter of orifice
1.00 in OK
Coefficient of discharge (Co) used in orifice diameter
calculation
0.60 (unitless)
Driving head (He) used in the orifice diameter calculation
0.50 it OK
Form SW401-Wetland-Rev.5-7/10/09 Pans I and II. Project Design Summary, Page 1 of 3

Surface Areas of Wetland Zones
Surface Area of Entire Welland
Shallow Land
The shallow land percentage is:
Shallow Water
The shallow water percentage is:
Deep Pool
Forebay portion of deep pool (pretreatment)
The forebay surface area percentage is:
Non-forebay portion of deep pool
The non-forebay deep pool surface area percentage is:
Total of wetland zone areas
Add or subtract the following area from the zones
Topographic Zone Elevations
Temporary Pool Elevation (TPE)
Shallow Land (top)
Permanent Pool Elevation (PPE)
Shallow Water/Deep Pool (top)
Shallow Water bottom
Most shallow point of deep pool's bottom
Deepest point of deep pool's bottom
Design must meet one of the following two options:
This design meets Option #1,
Top of PPE is within 6" of SHWT, If yes:
SHWT (Seasonally High Water Table)
This design meets Option #2,
Welland has liner with permeability <0.01 infhr, If yes:
Depth of topsoil above impermeable liner
Topographic Zone Depths
Temporary Pool
Shallow Land
Permanent Pool
Shallow Water
Deep Pool (shallowest)
Deep Pool (deepest)
Planting Plan
Are cattails included in the planting plan?
Number of Plants recommended in Shallow Water Area:
Herbaceous (4'cubic-inch container)
Number of Plants recommended in Shallow Land Area:
Herbaceous (4' cubic -inch container), OR
Shrubs (1 gallon or larger), OR
Trees (3 gallon or larger) and Herbaceous (4+cubic-inch)
Number of Plants orovided in Shallow Water Area
Herbaceous (4'cubic-inch container)
Number of Plants provided in Shallow Land Area
Herbaceous (4'cubic- inch container)
Shrubs (1 gallon or larger)
Trees (3 gallon or larger) and
Grass -like Herbaceous (4+cubic-inch)
4,852.00 f? OK
1,908.00 fe OK
39% %
1,957.00 it OK
40% %
509.00 ft, OK
10% %
478.00 ft' OK
10% %
4,852.00 f12 OK
0.00 ft,
3.50 it amsl
2.50 ft amsl
2.00 it amsl
1.00 it amsl
1.00 ft amsl
Y (Y or N)
2.50 it amsl OK
(Y or N)
in
12.00 in OK
6.00 in OK
18.00 in OK
18.00 in OK
n (Y or N) OK
500
500
80
10 and 400
500 OK
500
OK
n/a
OK
n/a
OK
n/a
OK
Form SW401-Wetland-Rev.5-7/10/09 Parts I and II. Project Design Summary, Page 2 of 3

Additional Information
Can the design volume be contained?
Does protect drain to SA waters? If yes,
What is the length of the vegetated filter?
Are calculations for supporting the design volume provided in the
application?
Is BMP sized to handle all runoff from ultimate build -out?
Is the BMP located in a recorded drainage easement with a
recorded access easement to a public Right of Way (ROW)?
The length to width ratio is:
Approximate wetland length
Approximate wetland width
Approximate surface area using length and width provided
y (Y or N)
n (Y or N)
30.00 ft
y (Y or N)
y (Y or N)
n/a (Y or N)
4.69 :1
150.00 It
32.00 It
4,800.00 It
Will the wetland be stabilized within 14 days of construction? y (Y or N)
OK
Excess volume must pass through filter.
OK
Cd7
Insufficient ROW location.
OK
This approx. surface area is within this number of square feet
of the entire wetland surface area reported above:
OK
Form SW401-Wetland-Rev.5.7/10/09 Pans I and 11, Project Design Summary, Page 3 of 3

Permit No.
(to be provided by DWQ)
III. REQUIRED ITEMS CHECKLIST
Plea5e 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.
Initials Page/ Plan
rr�'�
Sheet No.
ID— c115 1. Plans (1" - 50' or larger) of the entire site showing:
51WI62,6, 69 - Design at ultimate build -out,
- Off -site drainage (if applicable),
- Delineated drainage basins (include Rational C coefficient per basin),
- Wetland dimensions (and length to width ratio),
- Pretreatment system,
- Maintenance access,
►Vj14- Proposed drainage easement and public right of way (ROW),
- Overflow device, and
g/A - Boundaries of drainage easement.
1SIJ� P)un jails 2. Plan details (V = 50' or larger) for the wetland showing:
2460 - Wetland dimensions (and length to width ratio)
- Pretreatment system,
- Maintenance access,
iv,h - Proposed drainage easement and public right of way (ROW),
- Design at ultimate build -out,
- Off -site drainage (if applicable),
- Overflow device, and
LAP
Nth- Boundaries of drainage easement.
L �P plate 1W 6 3. Section view of the wetland (V = 20' or larger) showing:
- Side slopes, 3:1 or lower
- Wetland layers
All wetlands: Shallow land depth, shallow water depth, deep pool depth
Option 1, no clay liner: SLWT depth
Option 2, clay liner: Depth of topsoil on top of liner, liner specifications
OAO "165 4. A detailed planting plan IV = 20' or larger) prepared by a qualified individual showing:
Nr,aitPP Apfj E - A variety of several suitable species (not including cattails),
- Sizes, spacing and locations of plantings,
- Total quantity of each type of plant specified,
- A planting detail,
- The source nursery for the plants, and
- Fertilizer and watering requirements to establish vegetation.
CAD f& 615 5. A construction sequence that shows how the wetland will be protected from sediment until the entire
NWAIVdt1r 6 drainage area is stabilized.
UD NnrmjiuP ijppt 6. The supporting calculations (including drawdown calculations).
_6z� 7. A copy of the signed and notarized operation and maintenance (0&M) agreement.
I N/R 8. A copy of the deed restrictions (if required).
_JDqL f` at 1&e,A r 9. A soils report that is based upon an actual field investigation and soil borings. County soil maps are not an
acceptable source of soils information.
SW401-Wetland-Rev.5-7/10/09 Part III, page 1 of 1

DEC 1,0 2009
NC DENR
Permit Number'S6'3 7O"1 I ZO! -
po be pmvided L,v D1VO
Drainage Area Number:
Stormwater Wetland 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.
Important maintenance procedures:
- Immediately following construction of the stormwater wetland, bi-weekly inspections will be
conducted and wetland plants will be watered bi-weekly until vegetation becomes established
(commonly six weeks).
- No portion of the stormwater wetland will be fertilized after the first initial fertilization that is
required to establish the wetland plants.
- Stable groundcover will be maintained in the drainage area to reduce the sediment load to the
wetland.
- Once a year, a dam safety expert should inspect the embankment.
After the stormwater wetland is established, I will inspect it monthly 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 will be kept in a known set location and will be available upon request.
Inspection activifies shall be performed as follows. Any problems that are found shall be repaired
immediately.
)BMPielemeriti,___ _'�
f,T'otenrial io 'lem (: _' j
llowlIiwill reatediate-`thei rolilem _ �j
Entire BMP
Trash/debris is present.
Remove the trash/debris.
Perimeter of wetland
Areas of bare soil and/or erosive
Regrade the soil if necessary to remove the
gullies have formed.
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 long.
Maintain vegetation at an appropriate
height.
Inlet device: pipe or
swale
The pipe is clogged (if applicable).
Unclog the pipe. Dispose of the sediment
offsite.
The pipe is cracked or otherwise
Replace the pipe.
-damaged if applicable).
Erosion is occurring in the swale (if
Regrade the swale if necessary to smooth
applicable).
it over and provide erosion control
devices such as reinforced turf matting or
riprap to avoid future problems with
erosion.
Form SW401-Welland D&M-Rev.4
Page 1 of 3

Permit Number:
(la be provided by DWQ)
iBMKelement _. r
_
iP6art Hid W—oliIFm:i "' ' __i
iHow Itiwill remediate tlie; ro6lem
Forebay
Sediment has accumulated in the
Search for the source of the sediment and
forebay to a depth that inhibits the
forebay from functioning well.
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.
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
a pesticide is used, wipe it on the plants
rather than spraying.
Deep pool, shallow water
and shallow land areas
Algal growth covers over 50% of the
-deep pool and shallow water areas.
Consult a professional to remove and
control the algal growth.
Cattails, phragmites or other invasive
Remove invasives by physical removal or
plants cover 50% of the deep pool and
by wiping them with pesticide (do not
shallow water areas.
spray) - consult a professional.
Shallow land remains flooded more
than 5 days after a storm event.
Unclog the outlet device immediately.
Plants are dead, diseased or dying.
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 necessary.
Best professional practices show that
Prune according to best professional
pruning is needed to maintain optimal
practices.
plant health.
Sediment has accumulated and
Search for the source of the sediment and
reduced the depth to 75% of the
remedy the problem if possible. Remove
original design depth of the deep
pools.
the sediment and dispose of it in a location
where it will not cause impacts to streams
or the BMP.
Embankment
A tree has started to grow on the
Consult a dam safety specialist to remove
embankment.
the tree.
An annual inspection by appropriate
Make all needed repairs.
professional shows that the
embankment needs repair.
Evidence of muskrat or beaver activity
Consult a professional to remove muskrats
is present.
or beavers.
Micropool
Sediment has accumulated and
Search for the source of the sediment and
reduced the depth to 75% of the
remedy the problem if possible. Remove
original design depth.
the sediment and dispose of it in a location
where it will not cause impacts to streams
or the BMP.
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.
Receiving water
Erosion or other signs of damage have
occurred at the outlet. 1
Contact the NC Division of Water Quality
401 Oversight Unit at 919-733-1786.
Form SW401-Wetland O&M-Rev.4 Page 2 of 3

Permit Number:
(Fa be prtrvided 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:Twiddy Operations Building
BMP drainage area number.
Print name:Douglas A. Twiddy
Title:Managing Member, Twiddy Family Parinershio
Address:P.O. Box 369, Corolla, NC 27927
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.
'7
J
a Notary Public for the State of
/ v ' County of do hereby certify that
7--ZO Idd(l personally appeared before me this /l day of
��nn��yy, and acknowledge the due execution of the forgoing stormwater wetland
maintenance requirements. Witness my hand and official seal,
t-
°°�� `e40
SEAL
My commission expires (510
Form SW401-Wetland O&M-Rev.4 Page 3 of 3

ro
DEC 1,0 2009
Filter Stri stored
NC tion al
Permit Number: SUJ 7091ZaS
(to be provided by DWQ)
Drainage Area Number:
Riparian Buffer and Level Spreader
A 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.
Important maintenance procedures:
— Immediately after the filter strip is established, any newly planted vegetation
will be watered twice weekly if needed until the plants become established
(commonly six weeks).
— Once a year, the filter strip will be reseeded to maintain a dense growth of
vegetation
— Stable groundcover will be maintained in the drainage area to reduce the
sediment load to the vegetation.
— Two to three times a year, grass filter strips will be mowed and the clippings
harvested to promote the growth of thick vegetation with optimum pollutant
removal efficiency. Turf grass should not be cut shorter than 3 to 5 inches and
may be allowed to grow as tall as 12 inches depending on aesthetic requirements
(N1PC, 1993). Forested filter strips do not require this type of maintenance.
— Once a year, the soil will be aerated if necessary.
— Once a year, soil pH will be tested and lime will be added if necessary.
After the filter strip is established, it will be inspected quarterly and within 24 hours
after every storm event greater than 1.0 inch (or 1.5 inches if in a Coastal County).
Records of operation and maintenance will be kept in a known set location and will 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 the roblem:
The entire filter strip
Trash/debris is present.
Remove the trash/debris.
system
The flow splitter device
The flow splitter device is
Unclog the conveyance and dispose
(if applicable)
clogged.
of any sediment off -site.
The flow splitter device is
Make any necessary repairs or
damaged.
replace if damage is too large for
repair.
Form SWU401-Level Spreader, Filter Strip. Restored Riparian Buffer O&M-Rev.3 Page I of 3

BMP element:
Potentialproblem:
How I will remediate theproblem:
The swale and the level
The swale is clogged with
Remove the sediment and dispose
lip
sediment.
of it off -site.
The level lip is cracked,
Repair or replace lip.
settled, undercut, eroded or
otherwise damaged.
There is erosion around the
Regrade the soil to create a berm
end of the level spreader that
that is higher than the level lip, and
shows stormwater has
then plant a ground cover and
bypassed it.
water until it is established. Provide
lime and a one-time fertilizer
application.
Trees or shrubs have begun
Remove them.
to grow on the Swale or just
downslo e of the level lip.
The bypass channel
Areas of bare soil and/or
Regrade the soil if necessary to
erosive gullies have formed.
remove the gully, and then
reestablish proper erosion control.
Turf reinforcement is
Study the site to see if a larger
damaged or ripap is rolling
bypass channel is needed (enlarge if
downhill.
necessary). After this, reestablish
the erosion control material.
The filter strip
Grass is too short or too long
Maintain grass at a height of
(if applicable).
approximately three to six inches.
Areas of bare soil and/or
Regrade the soil if necessary to
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.
Sediment is building up on
Remove the sediment and
the filter strip.
restabilize the soil with vegetation if
necessary. Provide lime and a one-
time fertilizer application.
Plants are desiccated.
Provide additional irrigation and
fertilizer as needed.
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.
Nuisance vegetation is
Remove vegetation by hand if
choking out desirable species.
possible. If pesticide is used, do not
allow it to get into the receiving
water.
The receiving water
Erosion or other signs of
Contact the NC Division of Water
damage have occurred at the
Quality local Regional Office, or the
outlet.
401 Oversight Unit at 919-733-1786.
Form SWU401-Level Spreader, Filter Strip. Restored Riparian Buffer O&M-Rev.3 Page 2 of 3

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:Twiddv Operations Building
BMP drainage area number: I
Print name:Douglas A. Twiddv
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.
C GJ' -
a Notary Public for the State of
i
/�
, County of rC , do hereby certify that
Jar, gjgS 4, 7rzq iudq personally appeared before me this
day of', 1e(2M1aFit, and acknowledge the due execution of the
forgoing filter strip, riparian buffer, and/or level spreader maintenance requirements.
Witness my hand and official seal,
g VAMD,
OUa%.e40
SEAL
My commission expires /J � 0/0IF
(laq
Form SWU401-Level Spreader, Filter Strip, Restored Riparian Buffer OX M-Rev3 Page 3 of 3