SW7080704_CURRENT PERMIT_20091203

STORMWATER DIVISION CODING SHEET
POST -CONSTRUCTION PERMITS
PERMIT NO. SW -70e2 /0//
DOC TYPE CURRENT PERMIT
E] APPROVEDPLANS
El HISTORICAL FILE
El COMPLIANCE EVALUATION INSPECTION
DOC DATE
YYYYMMDD

NCDENR
North Carolina Department of Environment and
Beverly Eaves Perdue
Governor
County of Dare
Attn: Mr. Robert Outten
PO Box 1000
Manteo, NC 27954
Dear Mr. Outten:
Division of Water Quality
Coleen H. Sullins
Director
December 3, 2009
Natural Resources
Dee Freeman
Secretary
Subject: Stormwater Permit No. SW7080704
Bowsertown Landing Residential
High Density Stormwater Project
Dare County
The Washington Regional Office received your complete Stormwater
Management Permit application on October 5, 2009. 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. SW7080704 dated December 3, 2009 for the subject
project.
This permit shall be effective from the date of issuance until December 3, 2019,
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 iinal and binding. I
North Carolina Division of Water Quality Internet: %Nr%vWncwaterqualitv.or-
943 Washington Square Mall Phone: 46-6481
Washington, NC 27889 FAX [phone]
An Equal Opportunity/Affirmative Action Employer — 50% Recycled/10% Post Consumer Paper
Une
NorthCarolina
;Vatu.nally

Page 2 of 9
County of Dare
December 3, 2009
Page Two
If you have any questions, or need additional information concerning this matter,
please contact either Bill Moore, or me at [phone].
i incerely,
H1 +gz�
Regional Supervisor
Surface Water Protection Section
cc: Michael W. Robinson, P.E., P.L.S.
Dare County Planning/Inspections
.ZWashington Regional Office
Central Files

Page 3 of 9
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
County of Dare
Bowsertown Landing Residential Development
Dare County
FOR THE
construction, operation and maintenance of a stormwater system consisting of
infiltration basins, swales, and subsurface trenches, 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 December 3, 2019
and shall be subject to the following specified conditions and limitations:
1. 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 1.6 on page 4 of this permit. The
stormwater controls have been designed to handle the runoff from 47,006
square feet 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
4 of this permit, and per approved plans.

Page 4 of 9
P
A
The runoff from all built -upon area within the permitted drainage areas of
this project must be directed into the permitted stormwater control system.
The following design criteria have been provided for the infiltration basins
and must be maintained at design condition:
a. Total Site Area:
5.60 acres
b. Total Impervious Surfaces:
1.08 acres
C. Design Storm:
1.5 - inch
d. Basin Depth:
1.0 ft
e. TSS removal efficiency:
85%
f. Total Storage Volumes for Infiltration Basins:
7640 cf
g. Total Storage Volumes for Infiltration Swales:
2928 ef
h. Total Storage Volumes for Subsurface Trenches:
300 cf
i. Storage Elevation, FMSL:
4.0 ft
j. Receiving Stream/River Basin: UT-Croatan
Sound
k. Classification of Water Body:
SA
11. 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.

Page 5 of 9
9. A clear access path to the bypass structure must be available at all
times.
4. Records of maintenance activities must be kept and made available upon
request to authorized personnel of DWQ. The records will indicate the
date, activity, name of person performing the work and what actions were
taken.
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.
7. 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.

Page 6 of 9
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 December 3,
2019. 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.
Ill. 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.
Failure to abide by the conditions and limitations contained in this permit
may sub)ect 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.
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.
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.

Page 7 of 9
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 3 rd day of December, 2009.
NORTH CAROLINA ENVIRONMENTAL MANAGEMENT COMMISSION
1: for
Division of Water Quality
By Authority of the Environmental Management Commission
Permit Number SW7080704

Page 8 of 9
Stormwater Permit No. SW7080704
Bowsertown Landing Residential Development
Infiltration Systems
Dare County
Designer's Certification
as a duly registered
in the State of North Carolina, having been
authorized to observe (periodically/ weekly/ full time) the construction of the
project,
(Project)
for (Project Owner) hereby state that,
to the best of my abilities, due care and diligence was used in the observation of
the project construction such that the construction was observed to be built within
substantial compliance and intent of the approved plans and specifications.
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.
SEAL
Signature
Registration Number
Date

Page 9 of 9
Comf lete this checklist for each system and include with
Certi cation:
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.

zn,A.. 7111los
DWQ USE ONLY,'
Date Received
Fee Paid
Permit Number
!L?-5-- ()C�
5—o S—
E� 7aq o zi�
State of North Carolina
Department of Environment and Natural Resources
Division of Water Quality
STORMWATER MANAGEMENT PERMIT APPLICATION FORM ZF-,
Thisforin niay be photocopiedfor use as an ofiginal
OCT 0 5 2009
. 1. GENERAL INFORMATION
1. Applicants name (specify the name of the corporation, individual, etc. who owns the project):
Dare County Xsyoe.
PO 15-Y
,>
2. Print Owner/Signing Official's name and title (person legally responsible for facility and compliance):
Rnhprf niiffpn AqQiqfnnt Cniinfv Mannapr Cntinfv Affnrnpv e-_-X"fk R. /)11'
3. Mailing Address for person listed in item 2 above:
City: Manteo State:NC Zip:27954
Phone: [phone] Fax: [phone]
Email: [e-mail]
4. Project Name (subdivision, facility, or establishment name -should be consistent with project name on plans,
specifications, letters, operation and maintenance agreements, etc.):
Bowsertown Landing Residential Development
5. Location of Project (street address):
170 South California Street
City: Manteo County:Dare Zip:27954
6. Directions to project (from nearest major intersection):
Route 64/264 to Roanoke Island, South on Bowsertown road, left onto S. California Lane. The Rroject is on
the right just past the Coun!y boat ramp
7. Latitude:35'53'55"N Long, . tude:075' 41' 02" W of project
8. Contact person who can answer questions about the project:
Name: Michael W. Robinson, P.E. Telephone Number: (252 ) 255-8026
Email: [e-mail]
11. PERMIT INFORMATION:
Fonn SWU-101 Version 03.27.08 Page I of 4

1. Specify whether project is (check one): ENew E]Renewal E]Modification
2. If this application is being submitted as the result of a renewal or modification to an existing permit, list the
existing permit number and its issue date (if known)
3. Specify the type of project (check one):
FLow Density EHigh Density E]Redevelop []GeneralPermit E]UniversaISMP 00ther
4. Additional Project Requirements (check applicable blanks; information on required state permits can be
obtained by contacting the Customer Service Center at 1-877-623-6748):
FICAMA Major ZSedimentation/ Erosion Control E]404/401 Permit []NPDES Stormwater
III. PROJECT INFORMATION
1. In the space provided below, summarize how stormwater will be treated. Also attach a detailed narrative
(one to two pages) describing stormwater management for the project.
All runoff from impervious surfaces will be retained and infiltrated in an interconnected series of shallow basins,
shallow swales and a perforated pipe roof runoff infiltration system.
2. Stormwater runoff from this project drains to the Pasquotank River basin.
3. Total Property Area: 5.60 acres 4. Total Wetlands Area: 2.74 acres
5. 100' Wide Strip of Wetland Area: 1.91 acres (not applicable if no wetlands exist on site)
6. Total Project Area**: 5.60 acres 7. Project Built Upon Area:1.079 ac 19.27% %
8. How many drainage areas does the project have? 2 j,oe) / C.6 ;z &, -3 91r,
9. Complete the following information for each drainage area. If there are more than two drainage areas in the
project, attach an additional sheet with the information for each area provided in the same format as below.
For high density projects, complete the table with one drainage area for each engineered stormwater device.
'Basin Information
rea
Dramiage A A"
Drain 54e Area 2
Receiving Stream Name
Croatan Sound
Croatan Sound
Stream Class & Index No.
SA 30-20
SA 30-20
Total Drainage Area (so
47,006
196,926
On -site Drainage Area (so
0
0
Off -site Drainage Area (so
0
0
Existing Impervious* Area (so
0
0
Proposed Impervious*Area (so
47,006
0
% Impervious* Area (total)
100
0
:Impervious Surface Area
Drainage Area
Drainage 'Area 2
On -site Buildings (so
20,223
0
On -site Streets (so
26,783
0
On -site Parking (so
included in streets
0
On -site Sidewalks (so
0
0
,Other on -site (so
0
0
P��0
0
0
Total (so:
47,006
0
linpervious area is defined as the built upon area including, but not linfl�ted to, buildings, roads, parking areas,
sidewalks, gravel areas, etc.
Form SWU-101 Version 03.27.08 Page 2 of 4

**Total project area shall be calculated based on the current policy regarding inclusion of wetlands in the built upon area
percentage calculation. This is the area used to calculate percent project built upon area (BUA).
10. How was the off -site impervious area listed above
IV. DEED RESTRICTIONS AND PROTECTIVE COVENANTS
One of the following deed restrictions and protective covenants are required to be recorded for all subdivisions,
outparcels and future development prior to the sale of any lot. If lot sizes vary significantly, a table listing each lot
number, size and the allowable built -upon area for each lot must be provided as an attachment. Forms can be
downloaded from http://h2o.enr.state.nc.us/sulbml2 forms.htm - deed restrictions.
Form DRPC-1
High Density Commercial Subdivisions
Form DRPC-2
High Density Developments with Outparcels
Form DRPC-3
High Density Residential Subdivisions
Form DRPC-4
Low Density Commercial Subdivisions
Form DRPC-5
Low Density Residential Subdivisions
Form DRPC-6
Low Density Residential Subdivisions with Curb Outlets
By your signature below, you certify that the recorded deed restrictions and protective covenants for this
project shall include all the applicable items required in the above form, that the covenants will be binding
on all parties and persons claiming under them, that they will run with the land, that the required covenants
cannot be changed or deleted without concurrence from the State, and that they will be recorded prior to the
sale of any lot.
V. SUPPLEMENT FORMS
The applicable state stormwater management permit supplement form(s) listed below must be submitted for each
BMP specified for this project. Contact the Stormwater and General Pern-dts Unit at [phone] for the status
and availability of these forms. Forms can be downloaded from httl2://h2o.enr.state.nc.us/su/bmp forms.htm.
Form SW401 -Low Density
Form SW401-Curb Outlet System
Form SW401-Off-Site System
Form SW401-Wet Detention Basin
Form SW401-Infiltration Basin
Form SW401-Infiltration Trench
Form SW401-Bioretention Cell
Form SW401-Level Spreader
Form SW401-Wetland
Form SW401-Grassed Swale
Form SW401-Sand Filter
Form SW401-Permeable Pavement
Low Density Supplement
Curb Outlet System Supplement
Off -Site System Supplement
Wet Detention Basin Supplement
Infiltration Basin Supplement
Underground Infiltration Trench Supplement
Bioretention Cell Supplement
Level Spreader/Filter Strip/Restored Riparian Buffer Supplement
Constructed Wetland Supplement
Grassed Swale Supplement
Sand Filter Supplement
Permeable Pavement Supplement
Fonn SWU-101 Version 03.27.08
Page 3 of 4

V1. SUBMITTAL REQUIREMENTS
Only complete application packages will be accepted and reviewed by the Division of Water Quality (DWQ).
A complete package includes all of the items listed below. The complete application package should be
submitted to the appropriate DWQ Office. (Appropriate office maybe found by locating project on the
interactive online map at http://h2o.enr.state.nc.us/su/msi maps.htm)
1 1. Please indicate that you have provided the following required information by initialing in the space provided
next to each item.
• Original and one copy of the Stormwater Management Permit Application Form
• Original and one copy of the Deed Restrictions & Protective Covenants Form (if
required as per Part IV above)
• Original of the applicable Supplement Form(s) and O&M agreement(s) for each BMP
• Permit application processing fee of $505 (Express: $4,000 for HD, $2,000 for LD)
payable to NCDENR
• Calculations & detailed narrative description of stormwater treatment/ management
• Copy of any applicable soils report
• Two copies of plans and specifications (sealed, signed & dated), including:
- Development/ Project name
- Engineer and firm
-Legend
- North arrow
- Scale
Revision number & date
Initials
M '�?_
M lk'_2
,Y) "'.
- Mean high water fine
- Dimensioned property/project boundary
- Location map with named streets or NCSR numbers
- Original contours, proposed contours, spot elevations, finished floor elevations
- Details of roads, drainage features, collection systems, and stormwater control measures
- Wetlands delineated, or a note on plans that none exist
- Existing drainage (including off -site), drainage easements, pipe sizes, runoff calculations
- Drainage areas delineated
- Vegetated buffers (where required)
V11. AGENT AUTHORIZATION
If you wish to designate authority to another individual or firm so that they may provide information on your
behalf, please complete this section. (ex. designing engineer or firm)
Designated agent (individual or firm): Michael W. Robinson P.E.
Mailing Address: P.O. Box 2852
City: Kill Devil Hills State: NC Zip: 27948
Phone: (252 ) 255-8026 Fax:
Email:- [e-mail]
VIII. APPLICANT'S CERTIFICATION
1, (print or type naine of person listed in General Information, itern 2) Robert Outten, Countit Attorney I
certify that the information included on this permit application form is, to the best of my knowledge, correct and
that the project wil nstructed in conformance with the approved plans, that the required deed restrictions
"I
and protective c9lenants \Vill recorded, and that the proposed project complies with the requirements of 15A
NCAC2H.100(Y. , A., r I
Form SWU-101 Version 03.27.08
Page 4 of 4
Date:

O� W A Tf,�
AOWQ67-
A MD1.
217A STORMWATER MANAGEMENT PERMIT APPLICATION FORM
HCDENR 401 CERTIFICATION APPLICATION FORM
INFILTRATION BASIN 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 of the required information.
11. PROJECT INFORMATIOW': "'4-" " —
W,
Project Name Bowsertown Landing Residential Development
Contact Person Michael W. Robinson, RE
Phone Number 252-255-8026
Date 1011009
Drainage Area Number 1 -impervious surfaces
FIL', DESIGN INFORMATION,!'-�
Site Characteristics
Drainage area
47,006.00
ft2
Impervious area
47,006.00
112
Percent impervious
1.00
%
OCT 0 5 2009
Design rainfall depth
1.50
in
Peak Flow Calculations
1 -yr, 24-hr rainfall depth
3.42
in
lt!.�
1-yr, 24-hr intensity
0.14
in/hr
Pre -development 1 -yr, 24-hr discharge
0.00
It 3 /sec
Post -development 1 -yr, 24-hr discharge
3.76
113 /sec:
Pre/Post 1-yr, 24-hr peak flow control
3.76
ft/sec
Storage Volume: Non -SA Waters
Minimum design volume required
Design volume provided
Storage Volume: SA Waters
1.5" runoff volume
Pre -development I -yr, 24-hr runoff volume
Post -development 1 -yr, 24-hr runoff volume
Minimum required volume
Volume provided
Solis Report Summary
Soil type
Infiltration rate
SHWT elevation
Basin Design Parameters
Drawcown time
Basin side slopes
Basin bottom elevation
Storage elevation
Storage Surface Area
Top elevation
Basin Bottom Dimensions
Basin length
Basin width
Bottom Surface Area
5414.00
it'
0.00
it,
5,414.00
it'
5414.00
it'
it' L�Z OK
10,868.00
Loamy Sand
7._ infhr
::77�tov' fm S I
1.00 days
OK
4.00 :1
OK
fmsl
11_�
OK
2.55 fmsl
9,610.00 it,
4.00 fmsl
varies
it
varies
it
5,060.00
it'
Form SW401 -infiltration Basin-Rev.4 Parts 1. & 11, Design Summary, Page 1 of 2

Additional Information
Maximum runoff to each inlet to the basin?
ac-in
Permit No.
Length of vegetative filter for overflow
n/a ft
OK (to be pmvided by DWO)
Distance to structure
n/a
OK
Distance from surface waters
90.00 ft
OK
Distance from water supply well(s)
n/a It
OK
Separation from impervious soil layer
n/a it
OK
Naturally occuring soil above shwt
1.50 It
OK
Bottom covered with 4-in of clean sand?
y .(Y or N)
OK
Proposed drainage easement provided?
n/a (Y or N)
OK
Capures all runoff at ultimate build -out?
y (Y or N)
OK
Bypass provided for larger storms?
y (Y or N)
OK
Pretreatment device provided
y
Interconnected swales and gutter collection system
Forrn SW401-Infiltration Basin-Rev.4 Parts 1. & H. Design Summary, Page 2 of 2

AkT;_5;WA
TA STORMWATER MANAGEMENT PERMIT APPLICATION FORM
HCDENR 401 CERTIFICATION APPLICATION FORM
INFILTRATION BASIN SUPPLEMENT
This form must be filled out, printed and submitted.
The Required Items Checklist (Part /11) must be printed, filled out and submitted along with all of the required information.
Contact Person
Phone Number
Date
Drainage Area Number
Michael W. Robinson, P.E.
252-255-8026
1011/2009
2-Open space and qreen areas
')f WATfi,
650&_&_Qk
20 - - C.
0 Nii� ,
j G
DESIGN INFORMATION
Site Characteristics
Drainage area
196,926.00
ft2
Impervious area
0.00
It 2
Percent impervious
0.00
%
Design rainfall depth
1.50
in
Peak Flow Calculations
1 -yr, 24-hr rainfall depth
3.42
in
1 -yr, 24-hr intensity
0.14
in/hr
Pre -development 1 -yr, 24-hr discharge
0.00
ft/sec
Post -development 1 -yr, 24-hr discharge
0.00
ft3/sec
Pre/Post 1 -yr, 24-hr peak flow control
0.00
ft/sec
Storage Volume: Non -SA Waters
Minimum design volume required
ft3
Design volume provided
ft3
Storage Volume: SA Waters
15' runoff volume
0.00
ft3
Pre -development 1-yr, 24-hr runoff volume
0.00
ft3
Post -development 1 -yr, 24-hr runoff volume
0.00
W
Minimum required volume
0.00
it,
Volume provided
0.00
ft 3
OK
Solis Report Summary
Soil type
Loamy Sand
Infiltration rate
7.50
in/hr
SHVVT elevation
1.00
fmSI
Basin Design Parameters
Drawdown time
1.00
days
OK
Basin side slopes
4.00
:1
OK
Basin bottom elevation
3.00
knsl
OK
Storage elevation
2.55
fmsl
Storage Surface Area
9,610.00
it'
Top elevation
4.00
fmsl
Basin Bottom Dimensions
Basin length
van r es
it
Basin width
varies
it
Bottom Surface Area
5,060.00
it'
Form SW401 -infiltration Basin-Rev.4 Parts 1. & 11. Design Summary, Page I of 2

Additional Information
Ma)dmum runoff to each inlet to the basin?
ac-in
Permit No.
Length of vegetative filter for overflow
n1a ft
OK (to be provided by DWQ)
Distance to structure
n/a ft
OK
Distance from surface waters
90.00 ft
OK
Distance from water supply well(s)
n/a It
OK
Separation from impervious soil layer
n/a It
OK
Naturally oocuring soil above shwt
1.50 It
OK
Bottom covered with 4-in of clean sand?
y (Y or N)
OK
Proposed drainage easement provided?
n/a (Y or N)
OK
Capures all runoff at ultimate build -out?
y (Y or N)
OK
Bypass provided for larger storms?
(Y or N)
OK
Pretreatment device provided
y
Interconnected swales and gutter collection system
Fornn SW401 -infiltration Basin-Rev.4 Parts 1. & 11. Design Summary, Page 2 of 2

OCT 0 5 2009
Permit Number:
(to be provided by D WQ)
Drainage Area Number:
Infiltration 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.
Important maintenance procedures:
— The drainage area will be carefully managed to reduce the sediment load to the
infiltration basin.
— Immediately after the infiltration basin is established, the vegetation will be
watered twice weekly if needed until the plants become established (commonly
six weeks).
— No portion of the infiltration basin will be fertilized after the initial fertilization
that is required to establish the vegetation.
— The vegetation in and around the basin will be maintained at a height of
approximately six inches.
After the infiltration basin is established, it 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.
Potential problem:
I will remediate the problem:
The entire BMP
--How
Trash/debris is present.
Remove the trash/debris.
The perimeter of the
Areas of bare soil and/or
Regrade the soil if necessary to
infiltration basin
erosive gullies have formed.
remove the gully, and then plant a
ground cover and water until it is
established. Provide time and a
one-time fertilizer application.
The inlet device: pipe or
The pipe is clogged (if
Unclog the pipe. Dispose of the
Swale
applicable).
sediment off -site.
The pipe is cracked or
Replace the pipe.
otherwise damaged (if
applicable).
Erosion is occurring in the
Regrade the Swale if necessary to
Swale (if applicable).
smooth it over and provide erosion
control devices such as reinforced
turf matting or riprap to avoid
future problems with erosion.
Form SW40 I -Infiltration Basin O&M-Rev.3 Page I of 3

BMP element.,
Potential problem:
How I wil I remediate the problem:
The forebay
Sediment has accumulated
Search for the source of the
and reduced the depth to 75%
sediment and remedy the problem if
of the original design depth.
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 or
Provide additional erosion
riprap is displaced.
protection such as reinforced turf
matting or riprap, if needed to
prevent future erosion 2roblems.
Weeds are present.
Remove the weeds, preferably by
hand. If pesticides are used, wipe
them on the plants rather than
spraying.
The main treatment area
A visible layer of sediment
Search for the source of the
has accumulated.
sediment and remedy the problem if
possible. Remove the sediment and
dispose of it in a location where it
will not cause impacts to streams or
the BMP. Replace any media that
was removed in the process.
Revegetate disturbed areas
irrimediately.
Water is standing more than
Replace the top few inches of filter
5 days after a storm event.
media and see if this corrects the
standing water problem. If so,
revegetate immediately. If not,
consult an appropriate professional
for a more extensive repair.
Weeds and noxious plants are
Remove the plants by hand or by
growing in the main
wiping them with pesticide (do not
treatment area.
spray).
The embankment
Shrubs or trees have started
Remove shrubs or trees
to grow on the embankment.
immediately.
An annual inspection by an
Make all needed repairs.
appropriate professional
shows that the embankment
needs repair.
The outlet device
Clogging has occurred.
Clean out the outlet device. Dispose
of the sediment off -site.
The outlet device is damaged
Repair or replace the outlet device.
The receiving water
Erosion or other signs of
Contact the NC Division of Water
damage have occurred at the
Quality 401 Oversight Unit at 919-
outlet.
733-1786.
Form SW401 -Infiltration Basin O&M-Rev.3 Page 2 of 3

I f
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:Bowsertown Landing Residential Development
BMP drainage area numher: I - Entire Site
Print name:County of Dare c/o Bobby Outten
Title:Assistant County Manager and Attomey
Date: cz_> C/1 0)
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.
1, \_&)IL E Wi /./I a , ms , a Notary Public for the State of
NOH-A QOLrphoo, County of - -ZOf--e— , do hereby certify that
-Roberi­ j- . D(A-tttt-) personally appeared before me this
day of 0394 �ppq and acknowledge the due execution of the
forgoing infiltration basin maintenance requirements. Witness my hand and official seal,
% "tS1511188#01
),0 T A
B 00
JCP
Co.,
SEAL
My commission expires I I - -� 7 - /:!>
Form SW401 -Infiltration Basin O&M-Rev.3
Page 3 of 3