SW7080618_CURRENT PERMIT_20080919

STORMWATER DIVISION CODING SHEET
POST -CONSTRUCTION PERMITS
PERMIT NO. I SW �Lkf&ffl
DOC TYPE k7DCURRENT PERMIT
APPROVED PLANS
1:1 HISTORICAL FILE
El COMPLIANCE EVALUATION INSPECTION
DOC DATE
a
YYYYMMDD

aw- 4
Michael F. Easley, Governor
7
William G Ross Jr., Secretary
North Carolina Department of Environment and Natural Resources
Coleen H Sullins Director
Division of Water Quality
September 19, 2008
County of Dare
Attn: Mr. David Clawson
PO Box 1000
Manteo, NC 27954
Subject: Stormwater Permit No. SW7080618
Roanoke Island Senior Center
High Density Project
Dear Mr. Clawson: Dare County
The Washington Regional Office received a complete Stormwater Management Permit
Application for the subject project on August 14, 2008. Staff review of the plans and
specifications has determined that the project, as proposed, will comply with the
Stormwater Regulations set forth in Title 15A NCAC 2H. 1000. We are forwarding
Permit No. SW7080618 dated September 19, 2008, for the construction of the subject
project. 12-4 3 a 1"L- I
This permit shall be effective from the date of issuance until September 19, 2018 and
shall be subject to the conditions and limitations as specified therein. Please pay
special attention to the Operation and Maintenance requirements in this permit. railure
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, 6714 Mail Service Center, Raleigh, NC
27699-6714. Unless such demands are made this permit shall be final and binding.
If you have any questions, or need additional information concerning this matter, please
contact Bill Moore, or me at (252) 94%6-481.
in
in rely,
I io d
i o �e4
Regional Supervisor
Surface Water Protection Section
cc: Albemarle & Associates, LTD
Dare County Planning/Inspections
-,-*ashin ton Regional Office
Central Wiles
North Carolina Division of Water Quality Internet. h2o enr state.ncos
943 Washington Square Mail Phone. [phone]
Washington, NC 27889 FAX [phone]
An Equal Opportunity/Affinative Action Employer - 50% Recycled/10% Post Consumer Paper
One
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Naturally

STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES
DIVISION OF WATER QUALITY
STATE STORMWATER MANAGEMENT PERMIT
HIGH DENSITY DEVELOPMENT
In accordance with the provisions of Article 21 of Chapter 143, General Statutes of
North Carolina as amended, and other applicable Laws, Rules, and Regulations
PERMISSION IS HEREBY GRANTED TO
County of Dare
Roanoke Island Senior Center
Dare County
FOR THE
construction, operation and maintenance of an infiltration basin in compliance with the
provisions of 15A NCAC 2H .1000 (hereafter referred to as the "stonn water 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 for Roanoke Island Senior Center located at Manteo,
NC.
This permit shall be effective from the date of issuance until September 19, 2018 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.
2. This stormwater system has been approved for the management of stormwater
runoff as described in Section 1.6 on page 3 of this permit. The stormwater
controls have been designed to handle the runoff from 25,651 sf of impervious
area.
3. The tract will be limited to the amount of built -upon area indicated on page 3 of
this permit, and per approved plans.
4. All stormwater collection and treatment systems must be located in either
dedicated common areas or recorded easements. The final plats for the project
will be recorded showing all such required easements, in accordance with the
approved plans.
5. The runoff from all built -upon area within the permitted drainage area of this
project must be directed into the permitted stormwater control system.

The following design criteria have been provided for this project and must be
maintained at design condition:
a. Total Drainage area:
1.14 acres
b. Total Impervious Surfaces:
25,651 sf
C. Design Storm:
1.5 - inches
d. Infiltration Basins Provided Area:
6515 cf
(@ design storage elev)
e. Infiltration Basins Required Storage:
3095 cf
(based on 1.5-inch)
f. Minimum Provided Storage:
23,220 cf
(reflects conservative infiltration)
9. Receiving Stream/River Basin:
UT-Croatan Sound
h. 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 Plan must be followed in
its entirety and maintenance must occur at the scheduled intervals including, but
not limited to:
a. Semiannual scheduled inspections (every 6 months).
b. Sediment removal.
C. Mowing and revegetation of slopes and the vegetated filter.
d. Immediate repair of eroded areas.
e. Maintenance of all slopes in accordance with approved plans and
specifications.
f. Debris removal and unclogging of bypass structure, infiltration media, flow
spreader, catch basins, piping and vegetated filter.
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..
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.
111. GENERAL CONDITIONS
This permit is not transferable except after notice to and approval by the Director.
In the event of a change of ownership, or a name change, the permittee must
submit a formal permit transfer request to the Division of Water Quality,
accompanied by a completed name/ownership change form, documentation
from the parties involved, and other supporting materials as may be appropriate.
The approval of this request will be considered on its merits and may or may not
be approved. The permittee is responsible for compliance with all permit
conditions until such time as the Division approves the transfer request.
2. Failure to abide by the conditions and limitations contained in this permit may
subject the Permittee to enforcement action by the Division of Water Quality, in
accordance with North Carolina General Statute 143-215.6A to 143-21 5.6C.
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.
5. The permittee grants DENR Staff permission to enter the property during normal
business hours for the purpose of inspecting all components of the permitted
stormwater management facility.
6. The permit may be modified, revoked and reissued or terminated for cause. The
filing of a request for a permit modification, revocation and reissuance or
termination does not stay any permit condition.
7. Unless specified elsewhere, permanent seeding requirements for the stormwater
control must follow the guidelines established in the North Carolina Erosion and
Sediment Control Planning and Design Manual.
8. Approved plans and specifications for this project are incorporated by reference
and are enforceable parts of the permit.
9. The permittee shall notify the Division any name, ownership or mailing address
changes within 30 days.
10. This permit shall be effective from the date of issuance until September 19,
2018. Application for permit renewal shall be submitted 180 days prior to the
expiration date of this permit and must be accompanied by the processing fee.
Permit issued this the 19 th day of September, 2008.
T COMMISSION
Division of Water Quality
By Authority of the Environmental Management Commission
Permit Number SW7080618

Roanoke Island Senior Center
Stormwater Permit No. SW7080618
Dare County
Designer's Certification
1, , 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

Certification Attachment
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 weir elevation is per the approved plan.
6. The bypass structure is located per the approved plans.
7. A Trash Rack is provided on the 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.

Permit Number: SW70e,&tp /9
(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 win 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. sj�\i - 5 2 00
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:
How I will remediate the problem:
The entire BMP
Trash/debris is Present.
Remove the trash/clebris.
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 lime 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 SW401-Infil"tion Basin O&M-Rev.3 Page I of 3

BMP element:
Potential problem:
How I will remediate the problem:
The forebay
Sediment has accumulated
and reduced the depth to 75%
Search for the source of the
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 problems.
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
immediately.
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 outletdevice 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

Permit Number:
(to be provided by DWQ)
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:Roanoke Island Senior Center
BMP drainage area number:
Print name:David Clawson
TitleTinance Director
Address:PO Box 1000, Manteo, NC 27954
Signature: 'q*34�� cl�
Date: 3119� I 09�.
Note: The legally responsible party should not be a homeowners association unless more than 50% of
the lots have been sold and a resident of the subdivision has been named the president.
nn' a Notary Public for the State of
do hereby certify that
personally appeared before me thi s
day of and acknowledge the due execution of the
forgoing infiltration basin maintenance requirements. Witness my hand and official sea],
0
are- 1�45#0
0 O.0
0,7 issio r)
r)
0
SEAL
My commission expires?_t�D� I _()
Form SW401 -infiltration Basin O&M-Rev.3 Page 3 of 3

I
e� �"4f 5�iA-1 7agoi� j g
DWQ USE ONLY
Date RecRwed
Fee Paid
Permit Numi;�r
JUN
- 5 2008
JLQ!�—
%;
State of North Carolina
Department of Environment and Natural Resources
Division of Water Quality . .. � � �1- z
STORMWATER MJANAGEMENT PERMff "PLICATION FORM
This form maybe photocopiedfor use as an onginal
L GENERAL INFORMATION
1. Applicants name (specify the name of the corporation, individual, etc. who owns the project):
2. Print Owner/Signing Official's name and title (person legally responsible for facility and compliance):
David Clawson/Finance Director
3. Mailing Address for person listed in item 2 above:
City:Manteo State:NC Zjv: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.):
I
5. Location of Project (street address):
962 Marshall C Collins Drive.
City:Manbeo County:Dare Zip:279
6. Directions to project (from nearest major intersection):
Northwest comer of US 64 and US 64/264
7. Latitude:35*53'24"N Lon—Ritude:75'3942" W — of project
8. Contact person who can answer questions about the project:
Namejohn M. DeLucia, PE Telephone Number: (252 441-2113
Emafl:[e-mail]
11. PERMIT INFORMATION:
1. Specify whether project is (check one):
E]New
EIRenewal (ZModification

2. If'" application is being submitted as the result of a renewal or modification to an existing permit, list the
11 1
e i ting permit numberSW7060821 and its issue date (if known)December 7,2006
xis
3. Specify the type of project (check one):
F]Low Density gHigh Density E]Redevelop E]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):
FJCAMA Major ZSeclimentation/ Erosion Control E]404/401 Permit EINPDES Stormwater
111. ' PROJECT INFORMATION
1. In the space provided below, summarize how stormwater will be treated. Also attach a detailed narrative
(one to two pages) describing stormwaber management for the project.
Stormwater management consist of a forebay infiltration area and a forebay vepetated filter leading to an existing
stormwater retention pond. AU overflow will be directed to creative wetlands to the west An underground
2,000 &,allon cistern will used for irrigation of landscaped areas.
2. Stormwater runoff from this project drains to the Pasquotank River basin.
3. Total Property Area: 21.18 acres 4. Total Wetlands Area: 0 acres
5. 100' Wide Strip of Wetland Area: acres (not applicable if no wetlands exist on site)
1
6. Total Project Area**:1.14 acres 7. Project Built Upon Area:51.8 %
8. How many drainage areas does the project have?l
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, co plete the table with one drainage ar for each engineered stormwater device.
Basin Information
Drainage Area 1
Drainage Area 2
Receiving Stream Name
Croatan Sound
Stream Class & Index No.
SB 30-20-(l)
Total Drainage Area (sf)
49,500
On -site Drainage Area (so
0
:2- 5- 6 n .4,7 s-ao 5-1, 8
Off -site Drainage Area (sf)
0
Existing Impervious* Area (sf)
0
Proposed Impervious*Area (so
25,651
% Impervious* Area (total)
51.8
Impervious* Surface Area
Drainage Area I
Drainage Area 2
On -site Buildings (so
12,390
On -site Streets (sf)
0
On -site Parking (sf)
5,965
On -site Sidewalks (so
6,000
Other on -site (so
1,296
Off -site (so '
i 0
Total (sf):
1 25,651
O2F
Impervious area is defined as the built upon area including, but not lintited to, buildings, roads, parking areas,
sidewalks, gravel areas, etc.
**Total project area shall be calculated based on the current policy regarding inclusion of wetlands in the built upon area
percentage calculation. This is the area used to calculate percent pnject built upon area (BUA).
I_ �11 I I., --- :__ .� I � .. �C A

10. How was the off-sibe impervious area listed above derived?From 12reliminaKy calculations and drawings.
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 htti2://h2o.enr.state.nc.us/su/bml2 forms.htm - deed restrictions.
Form DRPC-1
High Density Commercial Subdivisions
Form DRPC-2
High Density Developments with Outparcels
Form DRPC-3
High Density Residential Subdivisions
Form DRPC-4
Low Density Commercial Subdivisions
Form DRPC-5
Low Density Residential Subdivisions
Form DRPC-6
Low Density Residential Subdivisions with Curb Outlets
By your signature below, you certify that the recorded deed restrictions and protective covenants for this
project shall include all the applicable items required in the above form, that the covenants will be binding
on all parties and persons claiming under them, that they will run with the land, that the required covenants
cannot be changed or deleted without concurrence from the State, and that they will be recorded prior to the
sale of any lot.
V. SUPPLEMENT FORMS
The applicable state stormwater management permit supplement form(s) Listed below must be submitted for each
BMP specified for this project. Contact the Stormwater and General Permits Unit at [phone] for the status
and availability of these forms. Forms can be downloaded from http://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/Filber Strip/Restored Riparian Buffer Supplement
Constructed Wetland Supplement
Grassed Swale Supplement
Sand Filter Supplement
Permeable Pavement Supplement

VI. SUBMITTAL REQUIREMENTS
Only complete application packages will be accepted and reviewed by the Division of Water Quality (DWQ).
A complete package includes all of the items listed below. The complete application package should be
submitted to the appropriate DWQ Office. (Appropriate office may be found by locating project on the
interactive online map at htti):/lh2o.enr.state.nc.us/su/msi maps.htm)
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 13%
• Ctiginal and one copy of the Deed Restrictions & Protective Covenants Form (if tliD
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 ($4,000 for Express) payable to NCDENR _1;;;d8
• 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
- Mean high water line
- Dimensioned property/ project boundary
- Location map with named streets or NCSR numbers
- Original contours, proposed contours, spot elevations, finished floor elevations
- Details of roads, drainage features, collection systems, and stormwater control measures
- Wetlands delineated, or a note on plans that none exist
- Existing drainage (including off -site), drainage easements, pipe sizes, runoff calculations
- Drainage areas delineated
- Vegetated buffers (where required)
VII. AGENT AUTHORIZATION
If you wish to designate authority to another individual or firm so that they may provide information on your
behalf, please complete this section. (ex. designing engineer or firm)
Designated agent (individual or firm):Albemarle & Associates, Ltd. - lohn DeLucia, PE
Mailing Address:PO Box 3989,115 West St. Clair St.
City:Kill Devil Hills State:NC Zip:27948
Phone: (252 ) 441-2113 Fax: [phone]
Email:[e-mail]
VIII. APPLICANT'S CERTIFICATION
1, (print or type name of person listed in General Information, item 2) David Clawson
certify that the information included on this permit application form is, to the best of my knowledge, correct and
that the project will be constructed in conformance with the approved plans, that the required deed restrictions
and protective covenants will be recorded, and that the proposed project complies with the requirements of 15A
NCAC 211.1000.
Signature: Q)hSIC Date:— -7h 9 16 4*
Form SWU- 10 1 Version 02.19.08 Page 4 of 4

lbemarle
& ASSOCIATES, LTD.
August 12, 2008
Auli' 1 4 �'008
NCDENR Land Quality Section
943 Washington Square Mail
Washington, NC 27889
ATTN: Mr. Bill Moore
RE: Roanoke Island Senior Center Stormwater Submittal
Stormwater Review # SW7060821
Dear Bill:
Please find the additional information you requested in order to issue a Stormwater
Management permit for the Roanoke Island Senior Center. The County proposes to
construct a 12,390 SF senior citizen/community center on a 1.14-acre portion of the
overall 21.18-acre site. On a portion of this parcel is the existing Dare County Judicial
Center.
The items noted in your letter dated August 7, 2008 have been addressed as follows:
• The soil boring log previously submitted has been provided. In addition, a soils
narrative is also provided.
• The cross-section of the vegetated swale has been detailed on Sheet C302,
Grading and Drainage Plan.
• The project area excluded from the drainage basin calculations is area
unencumbered by impervious surfaces. Any stormwater following into those
areas will -be managed through infiltration.
• We originally submitted the Stormwater Permit Application as a modifica * tion to
Permit # SW`7060821. If you prefer that it be permitted as a new/separate project
we have no objections. Please modify the application to reflect a new permit.
• As you suggested, we have enlarged the forebay infiltration area to an area of
10, 023 SF capable of holding a volume of 6515 CF. This should provide twice
the volume as you requested.
Engineering — Surveying — Land Planning
P. 0. Box 3989, 115 W Saint Clair St., Kill Devil Hills, NC 27948
Telephone: [phone] Fax: [phone]

Letter to Bill More
Stormwater Resubmittal for
Dare Go. Senior / Community Center
August 12, 2008
Page 2 of 2
Enclosed with this submittal are 2 copies each of the site plan sheets (6 sheets), soil
boring log, soils narrative and modified stormwater calculations for this work. Please do
you have any questions regarding this project.
Enc
cc: Dave Clawson — Dare County Finance Director
Tim Oakley, AIA
File 07699A/350

lbemarle
& ASSOCIATES, LTD.
SOILS NARRATIVE
ROANOKE ISLAND SENIOR CENTER
prepared for
COUNTY OF DARE
RECEIVED
AUG 1 4 2008
DWQ-WAR0
Dare County proposes to construct a 12,390 SF senior citizen/community center on a
1.14-acre portion of the overall 21.18-acre site. On a portion of this parcel is the existing
Dare County Judicial Center. A soils investigation was performed by John M. DeLucia,
PE on 6/4/08. The investigation included two borings were taken using a hand auger in
various locations of the proposed infiltration area. The results of this investigation are
summarized as follows:
North end of forebay infiltration area:
The Dare County Soils Survey has mapped this area as LeA (Leon fine sand), which
can be described as dark brown fine sand about 7" thick with a subsurface layer of light
gray sand about 8" thick. The underlying material to a depth of about 72" is gray sand.
This boring revealed a black organic material to a depth of 6" and black sands to a
depth of 12". At a 12" depth brown coarse sand was discovered. This course sand
contained very little organic or clay content, apparently substantiating the infiltration
rates which we conservatively estimated at 10 in/hr. At depths from 20"-38" gray sand
was present.
South end of forebay infiltration area:
This area is also mapped by The Dare County Soils Survey has mapped this area as
LeA (Leon fine sand). This boring revealed organic material with black sands to a depth
of 6" and brown sands w/organics from a depth of 6"-12". From 12"-30" brown sands
Worganics was discovered. At depths from 30"-38" gray sand was present.
Based upon the above soil compositions, the infiltration rate was conservatively
estimated to be 10 in/hr. The SHWT is based upon observations of soil colorations of
the pond and the adjacent wetlands areas.
C-1- S
ohv — —myhy - La. nn,,.j
P.O. Box3989. 115 W SaintClair&- KillDevilHills, NC 27948
Telephone, 252-441-2113 Fax, 252-441-0965

Roanoke Island Senior Center
Soil Boring Log RECERMED
depth
B-1
B-2
TS Black
TS Black
0" to 6*'
Organic with
Organic
black sands
6" to 12"
Black sands
Brown sands
w1organics
1 Tto 20"
Brown coarse
Brown sands
sand
wforganics
20" to 24"
Gray sand
Brown sands
w/organics
24" to 30"
Gray sand
Brown sands
w/organics
30" to 36"
Gray sand
Gray sand
36" to 38"
Gray sand
Gray sand
Soil Type
LeA
LeA
Ex. Ground
Elevation (ft.
4.0
4.0
above MSL)
Depth to
Estimated
36"
36"
SHWT (in)
ESHWT
Elevation
1 0
I
1.0
I
AUG 1 4 2008
0WQ-'A'AR0
Boring Locations:
B-1: North end of forebay infiftration area
B-2, South end of forebay infiltration area
Date borings completed: 6/4/08
Borings performed by John M. DeLucia, PE

STORMWATER CALCULATIONS
for
ROANOKE ISLAND SENIOR CENTER (Revised 8112108)
Stotmwater Drainage Ama #1
Drainage Arem 49,500 sf 1.14 w
SURFACE AREA INFORMATION
Imprevi, surface
C Value
Area
C-A
Building/Decla5bunpe
1-00
13,686
13,686
On-stu, Park"
0.95
5,965
5,667
0.1te sidenralk.
0.95
6,000
5,700
TotalInsperviranArea
25,651
25,053
Slomevaler Manageuntsmat Areas
C V.I..
Am.
C-A
Fmb.y Infiltration Arca
1.00
10,023
10,023
Total St..water Management Area
10,023
10,023
Total Contributing Artm
35,674
35,076
Composite C 0.98
Conttibuting Area 0.82 ac
Infilti-ation Basin Characteristics
Eumin Storage Sid! 22p, "Isone (�I)
Forebay Infilumlion Arcs 1:10 11 &,515
Tout
Cistern Storage for reu,&e Star Cin) Lenglh(ft) I Volume (cf)
2-000 gallon cisterm ...
Tout
AUG 1 4 2008
Infiltratim "
I surface, Area (0)
Inliltrwiton Rate, (inJbr)
fnfiftmt!�-V lue(c
Forebay Infiltration Arem
10,023
10.00
1w
Total
M705
Void SP2M
lamd Center 41)
Void Space (1/6)
Deptb (ft)
I Void Volume (cf)
n/a
20.00
1.00
1 0
Main
1 0
Stommater Management I .
1.5-
4.3-
5.0-
Intensity (in.1hr)
0.5
0.75
2.15
2.50
Rmoff (cfi)
0-40
0.60
1.73
2.01
2-11our Rmoff Voluarm: (cf)
2,899
4-301
12,465
14,494
Storage Valuate, (cf)
6,515
6,515
6,515
6,515
Infiltration Voltune (cf)
16,705
16,705
16,705
16,705
Void Volms, Under Pmd (cf)
0
0
0
0
Tout St�watcr Mamgcd (cf)
23,220
23,220
23,220
23,220
Percent Retained
801%
534%
186%
160%
Storrnwater failing upon the pervious and perinsciar anass with grvater ffian two feel wpmtim
excluded from calculations due na the pomosity of existing conditions/proposed fill.
based on �o hour infiltration rate.
cistean wharne of 267 CF is in c,cccas of I OW6 storage volumm, and is not included in storage calculations.
Pmpamd by Albemnaric and Associates, Ltd. 8/12r2OO8

Permit No.
(to be pmvided by DWQ)-
A-� �, WAT,,
AGIA 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 111) must be printed, filled out and submitted along with all of the required information.
11. PROJECT INFORMATION
Project Name Roaroke Island Senior Center
Contact Person John M. DeLucia, PE
Phone Number 252 441-2113
Date 613/2008
Drainage Area Number I
Drainage area
49,500.00
ft2
Impervious area
25,651.00
ft2
Percent impervious
052
%
Design rainfall depth
1.50
in
Peak Flow Calculations
1-yr, 24-hr runoff depth
in
1-yr, 24-hr intensity
inthr
Pre -development 1-yr, 24-hr runoff volume
fP/sec
Post -development 1 -yr, 24-hr runoff volume
fP/sec
PrelPost 1 -yr, 24-hr peak flow control
fO/sec
Storage Volume: Non -SR Waters
Minimum design volume required
3,618.00
ft'
Design volume provided
5,141.00
ft'
Storage Volume: SIR Waters
1-yr, 24-hr rainfall depth
in
Pre -development 1-yr, 24-hr runoff
Post -development 1 -yr, 24-hr runoff
Minimum volume required
ft3
Volume provided
ft3
Soils Report Summary
Soil type
LeA
Infiltration rate
10.00
in/hr
SHWT elevation
1.00
fmsl
Basin Design Parameters
Drawdown time
1.50
days
Basin side slopes
10.00
:1
Basin bottom elevation
3.00
fmsl
Storage elevation
430
finsl
Storage SA
4,56800
fe
Top elevation
4.80
frnsl
Basin Bottom Dimensions
Basin length
varies
It
Basin width
varies
ft
Bottom SA
2,60700
It!
OK for non -SR waters
OK
OK
OK
ELUP F1 DI
JUN - 5 2008
U --AAVQ--1Ai`A4R0
Fomn SW401-Infiftrabon Basm-Rev.2 Paris I & 11 Design Summary, Page 1 of 2

Permit
(to be provided by DWQ)
Additional Information
Total runoff volume captured by basin
2.00
ac-in
Length of vegetative filter for overflow
65.00
ft
Distance to structure
18.00
ft
Distance from surface waters
>100
It
Distance from water supply well(s)
>100
It
Separation from impervious soil layer
>15
ft
Naturally occuring soil above shwt
2.00
ft
Bottom covered wth 4-in of clean sand?
y
(Y or N)
Proposed drainage easement provided?
n/a
(Y or N)
Capures all runoff at ultimate build -out?
y
(Y or N)
Bypass provided for larger storms?
y
(Y or N)
Pretreatment device provided
n
OK
OK
OK
OK
OK
OK
OK
OK
OK
OK
OK
Form SW401-Infiftrabon Basin -Rev 2 Pam I & 11. Design Summary, Page 2 of 2

Permit No.
(to be pmvided by DWQ)
Jill. REQUIRED ITEMS CHECKLIST I
Please indicate the page or plan sheet numbers where the supporting documentation can be found. An incomplete submiltal package will
result in a request for additional information. This will delay final review and approval of the project Initial in the spare 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.
1 Plans (11" - 50'or larger) of the entire site showing:
- Design at ultimate build-oul,
- Off -site drainage (d applicable),
- Delineated drainage basins (include Rational C coefficient per basin),
- Basin dimensions,
- Pretrealtment system,
- High flow bypass system,
- Maintenance access,
- Proposed drainage easement and public right of way (ROM,
- Overflow device, and
- Boundaries of drainage easement.
�Ao
2. Partial plan (11" = 30'or larger) and details for the infiltration basin showing:
- Bypass structure,
- Maintenance access,
- Basin bottom dimensions,
- Basin cross-section with benchmark for sediment cleanout,
- Flow distribution detail for inflow,
- Vegetated fifter, and
- Pretreatment device.
7CU�T�
10-96
3. Section view of the infiltration basin (11' = 21Y or larger) showing:
P treatment and treatment areas, and
Inrleet and outlet structures.
4. A table of elevations, areas, incremental volumes & accumulated volumes to verify the volume provided.
5. 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.
C303
6. A construction sequence that shows how the infithation basin will be protected from sediment until the
entire drainage area is stabilized.
7. The supporting calculations.
*-a
A copy of the signed and notarized operation and maintenance (O&M) agreement.
-AIIA—
9. A copy of the deed restrictions (if required).
Form SW401-Infiltration Basm-Rev-2 Page 3 of 3 Part In. Required Items Cheddist Page 3 of 3

1;w_4�
��Roanoke Island Senior Center ,
Stormwater Permit No. SW7080618
Dare County
Designer's Certification
SEP 3 2010
1�� �Da_ "A as a duly registered P�OrE,;�,OXIAL
in the State of North Carolina, having been authorized to observe (pgLjgg[� weekly/
full time) the construction of the project,
, 7
aDOOC�e
(Project)
for P&r,, 0
=:n2.7tcl —(Project Owner) hereby state that, to the
best of my abilities, due c�re 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.
kk CA
Sign ure J INI � Y_/��
16759
R agi:trar
110
3)n?umber 1675 0 4
Date

Certification Attachment
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.
-:t�4.
Ali roof drains are located such that the runoff is directed into the system.
knj�:. 5. The bypass structure weir elevation is per the approved plan. CLd-NLO
_74Eja�6. The bypass structure is located per the approved plans. �9_L44LFr
tl�67. A Trash Rack is provided on the bypass structure.
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.
�41 1 The permitted amounts of surface area and/or volume have been
provided.
7;�kO27AII required design depths are provided.
'1�11I equired parts of the system are provided.
! �3A
4. The required system dimensions are provided per the approved plans.

-=PUVE� —
lbemarle
& ASSOCIATES, LTD.
September 1, 2010
NCDENR Land Quality Section
943 Washington Square Mall
Washington, NC 27889
ATTN: Mr. Bill Moore
I JE- U
SEP 3 2010
I
RE: Roanoke Island Senior Center Stormwater Certification
SW 7080618
Dear Bill:
Find enclosed the final certification for this project. If I can provide any additional
information, please do not hesitate to contact me. This system appears to be properly
constructed and functioning at this time.
)E
.er
cc: Dave Clawson — Dare County Finance Director
Tim Oakley,AIA
File 07699A/350
Engineering — Surveying — Land Planning
P 0. Box 3989, 115 W Saint Clair St., Kill Devil Hills, NC 27948
Telephone: [phone] Fax: [phone]