SW8980504_Historical File_20090803

411:54r,,,A
NCDENR
North Carolina Department of Environment and Natural Resources
Division of Water Quality
Beverly Eaves Perdue Coleen H. Sullins Dee Freeman
Governor Director Secretary
August 3, 2009
Ms. Debbie Smith, Mayor
Ocean Isle Beach
3 West 3rd Street
Ocean Isle Beach, NC 28469
Subject: State Stormwater Management Permit No. SW8 980504
Ocean Isle Beach 3rd &4th Street Extension
High Density Commercial infiltration Swale Project
Brunswick County
Dear Ms. Smith:
The Wilmington Regional Office received a complete State Stormwater Management Permit
Modification and Renewal Application for Ocean Isle Beach 3rd and 4th Street Extension on July
20, 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
effective September 1, 1995 as a minor modification under SL2008-211, effective October 1,
2008.
This site was inspected on July 31, 2009. The infiltration swales were not present. This project
was not certified by an engineer prior to issuing this permit because it was not built according to
the plans. Please note that.the Wilmington Regional Office must receive a Designer's
Certification within thirty (30)days of project completion as a condition of this permit. The
anticipated completion schedule is the fall of 2009. If the project schedule is extended such that
a Designer's Certification cannot be received by December 31, 2009 you must submit a letter by
December 31, 2009 to the address listed at the bottom of this letter requesting an extension to
the Designer's Certification deadline for no more than thirty (30) days. If further extension
requests are needed, they must be submitted by each extended deadline for an extended
period not to exceed thirty (30) days for any single request.
Permit SW8 980504 has been renewed on August 3, 2009, and shall be effective until April 30,
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. 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 fina! and binding.
Wilmington Regional Office
127 Cardinal Drive Extension,Wilmington,North Carolina 28405 One
Phone:[phone] FAX:[phone] Customer Service:1-877-623-6748 NorthCarolina
Internet:www.ncwaterquaiity.org Naturally
An Equal Opportunity\Affirmative Action Employer

State Stormwater Management Systems
Permit No. SW8 980504 Mod.
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES
DIVISION OF WATER QUALITY
STATE STORMWATER MANAGEMENT PERMIT
HIGH DENSITY COMMERCIAL 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
Debbie S. Smith & Town of Ocean Isle Beach
3rd and 4th Street Extension
West 3rd St. beginning at its intersection with Clinton St, Brunswick County
FOR THE
construction, operation and maintenance of infiltration swales in compliance with the
provisions of Session Law 2008-211 and 15A NCAC 2H .1000 (hereafter collectively
and separately 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 April 30, 2019, and shall be
subject to the following specified conditions and limitations:
I. DESIGN STANDARDS
1. This permit is effective only with respect to the nature and volume of stormwater
described in the application and other supporting data.
2. This stormwater system has been approved for the management of stormwater
runoff as described in Section 1.8 on page 3 of this permit. The stormwater
control has been designed to handle the runoff from 98,860 square feet of
impervious area.
3. The tract will be limited to the amount of built-upon area indicated in Section 1.8
on page 3 of this permit, and as shown on the approved plans.
4. All stormwater collection and treatment systems must be located in either
dedicated common areas or recorded easements. The final plats for the project
will be recorded showing all such required easements, in accordance with the
approved plans.
5. The runoff from all built-upon area within the permitted drainage area of this
project must be directed into the permitted stormwater control system.
Page 3 of 9

State Stormwater Management Systems
Permit No. SW8 980504 Mod.
6. The following design criteria have been permitted for the infiltration swales and
must be provided and maintained at design condition:
a. Drainage Area, Acres: 3.3
Onsite, ft : 144,90n
Offsite, ft2: 0
b. Total Imperviou§ Surfaces, ft2: 98,860
Onsite, ft : 98,860
Permitted 4/30/1999: 79,720
Add'I Permitted 8/3/2009: 19,140
Offsite, ft2: 0
c. Design Storm, inches: 1.5"
d. Basin Depth, feet: Varies V-shaped infil. swale
e. Bottom Elevation, FMSI„: Varies V-shaped infil. swale
f. Bottom Surface Area, ft : Varies V-shaped infil. swale
g. Permitted Storage Volume, ft3: 26,256
h. Type of Soil: Sand
i. Expected Infiltration Rate, in/hr: 20
j. Seasonal High Water Table, FMSL: 36-74" below bottom of swale
k. Time to Draw Down, hours: 0.24
I. Receiving Stream/River Basin: Eastern Channel, Old Sound
Creek/ Lumber
m. Stream Index Number: 15-25-6
n. Classification of Water Body: "SA; HQW"
II. SCHEDULE OF COMPLIANCE
1. The stormwater management system shall be constructed in its entirety,
vegetated and operational for its intended use prior to the construction of any
built-upon surface.
2. During construction, erosion shall be kept to a minimum and any eroded areas of
the system will be repaired immediately.
3. The permittee shall at all times provide the operation and maintenance
necessary to assure the permitted stormwater system functions at optimum
efficiency. The approved Operation and Maintenance Plan must be followed in its
entirety and maintenance must occur at the scheduled intervals including, but not
limited to:
a. Semiannual scheduled inspections (every 6 months).
b. Sediment removal.
c. Mowing and revegetation of slopes and the vegetated filter.
d. Immediate repair of eroded areas.
e. Maintenance of all slopes in accordance with approved plans and
specifications.
f. Debris removal and unclogging of bypass structure, infiltration media, flow
spreader, catch basins, piping and vegetated filter.
g. A clear access path to the bypass structure must be available at all times.
4. 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.
Page 4 of 9

State Stormwater Management Systems
Permit No. SW8 980504 Mod.
5. 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. A copy of the approved plans and specifications shall be maintained on file by
the Permittee for a minimum of ten years from the date of the completion of
construction.
7. Records of maintenance activities must be kept for each permitted BMP. The
reports will indicate the date, activity, name of person performing the work and
what actions were taken.
8. Within 30 days of the completion of this project, 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. The anticipated completion
schedule is the fall of 2009. If the project schedule is extended such that a
Designer's Certification cannot be received by December 31, 2009 you must
submit a letter by December 31, 2009 to the address listed at the bottom of this
letter requesting an extension to the Designer's Certification deadline for no more
than thirty (30) days. If further extension requests are needed, they must be
submitted by each extended deadline for an extended period not to exceed thirty
(30) days for any single request.
9. Access to the stormwater facilities shall be maintained via appropriate
easements at all times.
10. The permittee shall submit to the Director and shall have received approval for
revised plans, specifications, and calculations prior to construction, for any
modification to the approved plans, including, but not limited to, those listed
below:
a. Any revision to any item shown on the approved plans, including the
stormwater management measures, built-upon area, details, etc.
b. Project name change.
c. Transfer of ownership.
d. Redesign or addition to the approved amount of built-upon area or to the
drainage area.
e. Further development, subdivision, acquisition, lease or sale of any, 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 permittee shall submit final site layout and grading plans for any permitted
future areas shown on the approved plans, prior to construction.
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.
III. GENERAL CONDITIONS
Page 5 of 9

State Stormwater Management Systems
Permit No. SW8 980504 Mod.
1. Approved plans and specifications for this project are incorporated by reference
and are enforceable parts of the permit.
2. This permit is not transferable to any person or entity 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 the
appropriate documentation as listed on page 2 of the form. The approval of this
request will be considered on its merits and may or may not be approved.
3. The permittee is responsible for compliance with all permit conditions until such
time as the Division approves the transfer request.
4. 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.
5. 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.
6. 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
7. 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.
8. 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 reissuance or
termination does not stay any permit condition.
9. Unless specified elsewhere, permanent seeding requirements for the stormwater
controls must follow the guidelines established in the North Carolina Erosion and
Sediment Control Planning and Design Manual.
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 2H.1000, and NCGS 143-215.1 et. al.
11. The permittee shall notify the Division in writing of any name, ownership or
mailing address changes at least 30 days prior to making such changes.
12. The permittee shall submit a permit renewal application at least 180 days prior to
the expiration date of this permit. The renewal request must include the
appropriate documentation and the processing fee.
Permit issued this the 3rd day of August 2009.
NORTH CAROLINA ENVIRONMENTAL MANAGEMENT COMMISSION
Page 6 of 9

State Stomiwater Management Systems
Permit No. SW8 980504 Mod.
for 'een H. S lins, Dire6Pcc2-64
r
Division of Water Quality
By Authority of the Environmental Management Commission
Page 7 of 9

State Stormwater Management Systems
Permit No. SW8 980504 Mod.
Ocean Isle Beach 3rd & 4th Street Extension
Stormwater Permit No. SW8 980504
Brunswick 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:
SEAL
Signature
Registration Number
Date
Page 8 of 9

State Stormwater Management Systems
Permit No. SW8 980504 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 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.
cc: NCDENR-DWQ Regional Office
Inspector, Brunswick County Building Inspections
Page 9 of 9

•
Permit Number:-!7/U,��l/5-D9
• (to be provided by DWQ)
Drainage Area Number:
Infiltration Basin Operation and Maintenance Agreement
I will keep a maintenance record on this BMP. This maintenance record will be • .tin a
log in a known set location. Any deficient BMP elements noted in the inspectio w ; -
corrected,repaired or replaced immediately. These deficiencies can affect the integrity , 4:-.
of structures,safety of the public,and the removal efficiency of the BMP. flo 2 '.�
® 7 it
4 U0y
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/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 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-Infiltration Basin O&M-Rev.3 Page 1 of 3

BMP element: Potential problem: How I will 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 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 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. 1733-1786.
Form SW401-Infiltration Basin 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:Ocean Isle Beach 3rd& 4th Street Extension
BMP drainage area number:1
Print name:Debbie S. Smith
Title:Mayor
Address:Town of Ocean Isle Beach, 3 West 3rd Street, Ocean Isle Beach,NC 28469
Phone:(910 79-2166
Signatur :
Date: 4-69
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 vi 1L5 , a Notary Public for the State of
, County of .,u,hs i c, , do hereby certify that
lS.'eblos e S. SmZ personally appeared before me this ��-
day of Q,7r i I , obo g , and acknowledge the due execution of the
forgoing infiltration basin maintenance requirements. Witness my hand and official seal,
SEAL
My commission expires &IA,- 3 11
Form SW401-Infiltration Basin O&M-Rev.3 Page 3 of 3

DWQ USE ONLY
Date Received Fee Paid Permit Number
.5"-20 —O 9 . c7�°a - -Q57D 32 SItA5?' 'D,..CD
State of North Carolina
Department of Environment and Natural Resources
Division of Water Quality : 11W
STORMWATER MANAGEMENT PERMIT APPLICATIONI FOR240 2009
This form may be photocopied for use as an original
By.
I. GENERAL INFORMATION
1. Applicants name(specify the name of the corporation,individual,etc.who owns the project):
Town of Ocean Isle Beach
2. Print Owner/Signing Official's name and title(person legally responsible for facility and compliance):
Debbie S.Smith,Mayor
3. Mailing Address for person listed in item 2 above:
Town of Ocean Isle Beach,3 West 3rd Street
City:Ocean Isle Beach State:NC Zip:28469
Phone: (910 ) 579-2166 Fax: (910 ) 5798804
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.):
Ocean Isle Beach 3rd&4th Street Extension
5. Location of Project(street address):
West 3rd Street beginning at its intersection with Clinton Street
City:Ocean Isle Beach County:Brunswick Zip:28469
6. Directions to project(from nearest major intersection):
Enter Ocean Isle Beach on NC 904. Turn right on West 3rd Street. Project begins two blocks after turn.
7. Latitude:33°53'21"N Longitude:-78°26'26"W of project
8. Contact person who can answer questions about the project:
Name:Donald M.Covil,P.E. _ Telephone Number: (910 ) 575-5872
Email:[e-mail]
II. PERMIT INFORMATION:
1. Specify whether project is(check one): ❑New ®Renewal ®Modification
Form SWU-101 Version 09.25.08 Page 1 of 4

2. If this application is being submitted as the result of a renewal or modification to an existing permit,list the
existing permit number SW8 980504 Modification and its issue date(if known) 4/30/1999
3. Specify the type of project(check one):
❑Low Density ®High Density ❑Redevelop ❑General Permit ❑Universal SMP ❑Other
4. Additional Project Requirements(check applicable blanks;information on required state permits can be
obtained by contacting the Customer Service Center at 1-877-623-6748):
❑CAMA.Major Sedimentation/Erosion Control 0404/401 Permit ❑NPDES Industrial Stormwater
III. PROJECT INFORMATION
1. In the space provided below,summarize how stormwater will be treated. Also attach a detailed narrative
(one to two pages)describing stormwater management for the project.
The runoff from the first 1 1/2"of rainfall will be collected in roadside swales and infiltrate.
2. Stormwater runoff from this project drains to the Lumber River basin.
3. Total Property Area: 3.33 acres 4. TotaI Coastal Wetlands Area: 0 acres
5. Total Property Area(3) - Total Coastal Wetlands Area(4) = Total Project Area**: 3.33 acres
6. (Total Impervious Area/ Total Project Area)X 100 = Project Built Upon Area(BUA): 68.23 %
7. How many drainage areas does the project have? 1
8. 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 Drainage Area 1 Drainage Area 2
Receiving Stream Name Eastern Channel,Old Sound Creek
Stream Class&Index No. SA;HQW 15-25-6 Total Drainage Area(sf) 144,900
On-site Drainage Area(sf) 144,900
Off-site Drainage Area(sf) 0
Existing Impervious*Area(sf) 77,350
Proposed Impervious*Area(sf) 21,510
% Impervious*Area(total) 68.23
Impervious*Surface Area Drainage Area 1 Drainage Area 2
On-site Buildings(sf) 0
On-site Streets (sf) 74,220
On-site Parking (sf) 0
On-site Sidewalks (sf) 0
Other on-site (sf) 24,640
Off-site (sf) 0
Total (sf): I 98,860
*Impervious area is defined as the built upon area including,but not limited to,buildings,roads,parking areas,
sidewalks,gravel areas,etc.
**Total project area shall be calculated to exclude Coastal Wetlands from use when calc atin: the built upon area
percentage calculation. This is the area used to calculate overall percent project built:: .:
JUL 2 0 2009
Form SWU-101 Version 09.25.08 Page 2 of 4
BY;

9. How was the off-site impervious area listed above derived? N/A
Projects in Union County: Contact the DWQ Central Office staff to check to see if you project is located
within a Threatened&Endangered Species watershed that may be subject to more stringent stormwater
requirements.
IV. DEED RESTRICTIONS AND PROTECTIVE COVENANTS
One of the following property 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/su/bmp 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 property 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 NC DWQ 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 Permitting Unit at(919)807-6300 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 Low Density Supplement
Form SW401-Curb Outlet System Curb Outlet System Supplement
Form SW401-Off-Site System Off-Site System Supplement
Form SW401-Wet Detention Basin Wet Detention Basin Supplement
Form SW401-Infiltration Basin Infiltration Basin Supplement
Form SW401-Infiltration Trench Underground Infiltration Trench Supplement
Form SW401-Bioretention Cell Bioretention Cell Supplement
Form SW401-Level Spreader Level Spreader/Filter Strip/Restored Riparian Buffer Supplement
Form SW401-Wetland Constructed Wetland Supplement
Form SW401-Grassed Swale Grassed Swale Supplement
Form SW401-Sand Filter Sand Filter Supplement
Form SW401-Permeable Pavement Permeable Pavement Supplement
Form SW401-Cistern Cistern Supplement
Form SWU-101 Version 09.25.08 Page 3 of 4

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 http://h2o.enr.state.nc.us/stilmsi_maps.htm)
1. Please indicate that you have provided the following required information by initialing in the space provided
next to each item.
'tials
• OriginaI and one copy of the Stormwater Management Permit Application Form
• Original and one copy of the Deed Restrictions&Protective Covenants Form(if /V/A
required as per Part IV above)
• Original of the applicable Supplement Form(s)and O&M agreement(s)for each BMP (4)ywL
• 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
-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(such as additional information requests),please complete this section. (ex.designing engineer or firm)
Designated agent(individual or firm): Compass Pointe Engineering,PA
Mailing Address:6934-6 Beach Drive,SW
City:Ocean Isle Beach State: NC Zip: 28469
Phone: (910 ) 575-5872 Fax: f910 ) 575-1214
Email:[e-mail]
VIII. APPLICANT'S CERTIFICATION
I, (print or type name of person listed in General Information, item 2) Debbie S.Skim 4n (
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
NCA H�Q00.
Signa re: \IA Date:
1 -"7
Form SWU-101 Version 09.25.08 Page 4 of 4

Permit No 7f)U /'Ds—O
(to beprovidedbyDWQ
AVA OF WATt9P
o3�
STORMWATFR MANAGEMENT PERMIT APPLICATION FORM O'o
NCDENR 401 CERTIFICATION APPLICATION FORM
INFILTRATION BASIN SUPPLEMENT
This form must be filled out,printed and submitted.
The Required Items Checklist(Part Ill)must be printed,filled out and submitted along with all of the required information.
II. PROJECT INFORMATION
Project Name Ocean Isle Beach 3rd 5 4th Street Extension
Contact Person Donald M.Cov8,P.E.
Phone Number [phone]
Date 3/25/2009,Revised 7-15-09
Drainage Area Number 1
IP. DESIGN INFORMATION
Site Characteristics
Drainage area 144,900.00 it2
Impervious area 98,860.00 ft2
Percent impervious 0.68 %
Design rainfall depth 1.50 in
Peak Row Calculations
1-yr,24-hr rainfall depth 3.73 in
1-yr,24-hr intensity 0.32 inlhr
Pre-development 1-yr,24-hr discharge 0.00 its/sec
Post-development 1-yr,24-hr discharge 0.00 tt/sec
Pre/Post 1-yr,24-hr peak flow control 0.00 ft3/sec
Storage Volume:Non-SA Waters
Mnimum design volume required ft3
Design volume provided ft3
Storage Volume: SA Waters
1.5'runoff volume 18113.00 ft3
Pre-development 1 yr,24-hr runoff volume 0.00 tt3
Post-development 1-yr,24-hr runoff volume 0.00 its
Minimum required volume 18113.00 it3
Volume provided 26,256.00 it3 0K
Soils Report Summary
Soil type sand
1111681bn rate 20.00 in/hr
SHWT elevation varies(>70'deep;fmsl
Basin Design Parameters
Drawdown time 0.01 days OK
Basin side slopes s 4.50 :1 0K
Basin bottom elevation (varies) fmsl #VALUE!
Storage elevation (varies) fmsl
Storage Surface Area (varies) flz
Top elevation (varies) imsl
Basin Bottom Dimensions
Basin length (varies) ft
Basin width (varies) ft 4/4
Bottom Surface Area (varies) tt2 '— 2 0 2��9
Form SW401-Inelration Basin-Rev.4 Parts I. II.Design Summary,Page 1 of 2

Permit No.
(to be provided by DWQ)
Additional Information
Maximum runoff to each inlet to the basin? (n/a) ac-in Maximum of 2 acre-inches allowed
Length of vegetative filter for overflow (n/a) ft OK
Distance to structure
(n/a) ft OK
Distance from surface waters 150.00 ft OK
Distance from water supply well(s) >200 ft OK
Separation from impervious soil layer (n/e) ft OK
Naturally occuring soil above shwt >5 8 ft 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? (n/a) (Y or N) OK
Pretreatment device provided (n/a)
Form SW407-Infiltration Basin-Rev.4 Parts I.&II.Design Summary,Page 2 of 2

Permit No.
(to be provided by DWQ)
III. REQUIRED ITEMS CHECKLIST
Please indicate the page or plan sheet numbers where the supporting documentation can be found. An incomplete submittal package will
result in a request for additional information. This will delay final review and approval of the project. Initial in the space provided to
indicate the following design requirements have been met. If the applicant has designated an agent,the agent may initial below. If a
requirement has not been met,attach justification.
Pagel Plan
Initials Sheet No.
C-2 t C-1. 1. Plans(1" 50'or larger)of the entire site showing:
-Design at ultimate build-out, '—4 ',
4.-Off-site drainage(if applicable), D
-Delineated drainage basins(include Rational C coefficient per basin) SAY 2 0 2009
-Basin dimensions, tiy.
-Pretreatment system,
-High flow bypass system,
-Maintenance access,
Proposed drainage easement and public right of way(ROW),
Overflow device,and
-Boundaries of drainage easement.
1Q) - C ----:
2. Partial plan(1"=30'or larger)and details for the infiltration basin showing:
-Bypass structure,
l:Alana Itci iancc acccss,
Basin bottom dimensions,
-Basin cross-section with benchmark for sediment cleanout,
Flow distribution detail for inflow,
-Vegetated filter,and
-Pretreatment device.
aht•L— Cv-7 3. Section view of the infiltration basin(1" 20'or larger)showing:
-Pretreatment and treatment areas,and
-Inlet and outlet structures
L'��ir. 4. A table of elevations,areas,incremental volumes&accumulated volumes to verify the volume provided.
CO'g.... e_... . iri1"
� . 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.
46 C-2 6. A construction sequence that shows how the infitlration basin will be protected from sediment until the
entire drainage area is stabilized.
dew 4.,,,s.L2.) 7. The supporting calculations.
en
AP.. - 8. A copy of the signed and notarized operation and maintenance(O&M)agreement.
It 3. A copy of the deed restrictions(if required).
Y. (S« C —,4-- C---C`J
Form SW401-Infiltration Basin-Rev.4 Page 1 of 1 Part III.Required Items Checklist,Page 1 of 1

NCDENR
North Carolina Department of Environment and Natural Resources
Division of Water Quality
Beverly Eaves Perdue Coleen H. Sullins Dee Freeman
Governor Director Secretary
August 3, 2009
Ms. Debbie Smith, Mayor
Town of Ocean Isle Beach
3 West 3`d Street
Ocean Isle Beach, NC 28469
NOTICE OF INSPECTION
Ocean Isle Beach 3rd &4th Street Extension
Stormwater Project No. SW8 980504
Brunswick County
Dear Ms. Smith:
Please find attached a copy of the completed form entitled "Stormwater Compliance
Inspection Report". The report summarizes the findings of a recent inspection of the
project's stormwater controls conducted on July 31, 2009 to determine compliance with
Stormwater Permit Number SW8 980504 issued on April 30, 1999 in preparation for a
renewal and modification issued on August 3, 2009.
The required actions that are necessary to bring this site into compliance are noted on
the attached inspection report. These actions have also been included as requirements
of your August 3, 2009 permit:
This site was inspected on July 31, 2009. The infiltration swales were not
present. This project was not certified by an engineer prior to issuing this permit
because it was not built according to the plans. Please note that the Wilmington
Regional Office must receive a Designer's Certification within thirty (30) days of
project completion as a condition of this permit. The anticipated completion
schedule is the fall of 2009. If the project schedule is extended such that a
Designer's Certification cannot be received by December 31, 2009 you must
submit a letter by December 31, 2009 to the address listed at the bottom of this
letter requesting an extension to the Designer's Certification deadline for no more
than thirty (30) days. If further extension requests are needed, they must be
submitted by each extended deadline for an extended period not to exceed thirty
(30) days for any single request.
Failure to provide the requested information, when required, may initiate enforcement
action including the assessment of civil penalties of up to $10,000 per day.
Wilmington Regional Office
127 Cardinal Drive Extension,Wilmington,North Carolina 28405 One
Phone:[phone] FAX:[phone] Customer Service:1-877-623-6748 NorthCarolina
Internet www.ncwaterquality.org Naturally
An Equal Opportunity 1 Affirmative Action Employer

SW8 980504
August 3, 2009
Please be reminded that if any ownership or name change has occurred it is the
permittee's responsibility to notify this office in writing. If you have any questions please
contact me at the Wilmington Regional Office, telephone number [phone].
Sincerely,
oyq,\_.....,---
Kelly Johnson
Environmental Engineer
GDS/KPJ: S:1WQS1StormWater\INSPECT1980504.aug09
cc: Don Covil, PE, Compass Pointe Engineering
Wilmington Regional Office
Central Files
Page 2 of 2

Compliance Inspection Report
Permit: SW8980504 Effective: 04/30/99 Expiration: 04/30/09 Owner: Town of Ocean Isle Beach
Project: 3rd and 4th Street Extension
County: Brunswick 3rd And 4th St
Region: Wilmington
Ocean Is!Bch NC 28469
Contact Person: Larry Sellers Title: Public Works Director Phone: [phone]
Directions to Project:
Take Ocean Isle Beach Causeway across Intercoastal Waterway and turn Right on 3rd Street
Type of Project: State Stormwater-Infiltration System .
Drain Areas: 1 -(Sand Hill Creek)(03-06-17)(C;Sw)
On-Site Representative(s):
Related Permits:
Inspection Date: 07/31/2009 Entry Time: 08:30 AM Exit Time: 09:00 AM
Primary Inspector: Kelly Johnson Phone: [phone]
Secondary Inspector(s):
Reason for Inspection: Routine Inspection Type:Stormwater
Permit Inspection Type: State Stormwater
Facility Status: 0 Compliant 0 Not Compliant
Question Areas:
®State Stormwater
(See attachment summary)
Page: 1

Permit:SW8980504 Owner-Project:Town of Ocean Isle Beach
Inspection Date: 07/31/2009 Inspection Type:Stormwater Reason for Visit: Routine
Inspection Summary:
The swales are not present, and more BUA was built than was originally permitted.
File Review Yes No NA NE
Is the permit active? • ❑ ❑ ❑
Signed copy of the Engineer's certification is in the file? 0 • 0 ❑
Signed copy of the Operation&Maintenance Agreement is in the file? ■ ❑ ❑ ❑
Copy of the recorded deed restrictions is in the file? 0 0 • ❑
Comment: Need Engineer's certification
Built Upon Area Yes No NA NE
Is the site BUA constructed as per the permit and approval plans? 0 ■ 0 0
Is the drainage area as per the permit and approved plans? ■ ❑ ❑ ❑
Is the BUA(as permitted)graded such that the runoff drains to the system? ■ ❑ ❑ ❑
Comment: Built with 5ft bike lanes on either side of road
SW Measures Yes No NA NE
Are the SW measures constructed as per the approved plans? 0 ■ 0 0
Are the inlets located per the approved plans? 0 0 0 •
Are the outlet structures located per the approved plans? 0 0 0 •
Comment: The swales are not present.
Operation and Maintenance lies No NA NE
Are the SW measures being maintained and operated as per the permit requirements? 0 0 0 •
Are the SW BMP inspection and maintenance records complete and available for review or provided to DWQ 0 0 0 •
upon request?
Comment: The swales are not present.
Other Permit Conditions Yes No NA NE
Is the site compliant with other conditions of the permit? 0 0 0 ■
Comment:
Other WC)Issues Yes No NA NE
Is the site compliant with other water quality issues as noted during the inspection? 0 0 0 ■
Comment:
Page: 2

"Ce
3rd&4th Street Extension
SW8 980504
July 20,2009 Data Submittal Review
This project was originally permitted as 20ft wide street,and the volume for the BMP was calculated as though the entire project area was
impervious(100%),even though it was actually only 54.7%. The project was constructed to have a 5ft bike lane on each side(68.23%).
This submittal is to permit the bike lanes that were built unpermitted. The bike lane area is under the 2008 rule/SA&the depth is 3.73".
When considering the higher depth on the bike lines,the current BMP will still accommodate the additional volume. (The BMP installed is
2.7X the required volume of the 1999 design and 2.0X the 2009 required volume).
BUA Supporting I Original Original+
Data New BUA
Permitted
4/30/99 Permitted
2009 j
Driveways(Other On-Site) 30.720 24.6401
Number: 96
Width(ft): 16
Length(ft) 20
Existing drives, north side 2,580
Existing drives,south side 1,000
Existing side roads,north side 0
Existing side roads,south side 1,320
Future drives,north side 10,270
Future drives,south side 9,020
Future side roads,north side 0
Future side roads,south side 450
Streets 49,000 74,220
Width permitted(ft): 20
Width built(ft) 30
Length(ft) 2,450
Total BUA(ft2) 79,720 98,8601
"New"BUA proposed(ft2) 0 19,140
Drainage Area(ft2) 144,900 144,900`
Drainage Area(Acre) 3.3 3.3
BUA% 55.02% 68.23%;
Volume Provided,ft3: 29,152 26,256
Volume(if 1.5"for whole site,if assume 100%Impervious)* 18,113 18,113
Volume Required Total(Simple Method)ft3: 8,969 8.969
Rvpre 0.0500
Rvp,s, 0.5452
Volume(1.5"on 1999-permitted impervious) 8,969 8,969
Volume(1.5"on impervious, using acres&not ft2 in calcs)*** 9.744
Infiltration of Design Storm
Infiltration rate(in/hr) 20 20
Surface area of bottom of infiltration area(ft2) 65,180 46,040
Time to drawdown required volume(hr) Permit says 3-6 ii 0.12
Time to drawdown, 1.5"storm for entire drainage area(hr) hrs? I 0.24
Time to drawdown provided volume(hr) 0.34
Dimensions
SHWT(FMSL)** 6** I Varies I
Bottom of infiltration basin fmsl Varies I Varies
*Calculations were originally based on 1.5"for entire drainage area(as if 100%impervious). BMP can handle adding BUA.
**SHWT on original plans was shown to be 36-74"below the bottom of the infiltration swale.
***This value appeared in the 1999 permit. It was based on acres,and so it was slightly off from the ft2calculation.

> 1
� �: \ L Phone: [phone]
6934-6 Beach Drive, SW —' `�, Fax: [phone]
Ocean Isle Beach, NC 28469 '~ Email: [e-mail]
tAt1 R om'QA
L
Wednesday,July 15,2009
Ms.Kelly Johnson,Environmental Engineer
NCDENR,DWQ
`'°
127 Cardinal Drive Fxtenainn 2
Wilmington,North Carolina 28403 ��'. 0 2409
Subject: Stormwater Permit No.SW8980504 Renewal/Modification
3"l and 4t1 Street Extension
Town of Ocean Isle Beach
Dear Ms.Johnson:
We are in receipt of your July 13, 2009 letter to Ms. Debbie Smith, Mayor of Ocean Isle Beach
relative to your review of the subject project. The following addresses your itemized comments:
1. We have revised and expanded the Built-Upon Area Data Table to more clearly illustrate
the breakdown of the BUA. This table now reflects the incremental values presented in the
Stormwater Application.
The term "not considered" in the calculations refers to the consideration of the project
without"future" driveways. Conversely, the term"considered" refers to the consideration
of the project in the future when all lots are occupied.
The term"side roads"represents the portions of the intersecting roads where pavement will
be within the right-of-way of 3`1 or 4w Street. This term was used solely to indicate that we
are taking into consideration the additional pavement in the existing or future intersections.
2. The expanded BUA Data Table mentioned above clarifies the method for calculating
roadway BUA(2,450 SF @ 30' wide plus 720 SF contingency). As noted,the BUA is now
stated to be the same as the value given for"On-site Streets"in the application.
3. The stream index number has been added to the application.
4. Page 2b in the calculations addresses the"1 yr/24 hr pre/post". It is noted that an error has
been corrected for "Adjust Peak Hour Depth..." It is further noted that the calculations
address the entire project area,not just the new portion of the roadway.
5. A new calculation sheet has been added to reflect the typical method for calculating
drawdown time.
LAND PLANNING & SITE DESIGN• WATER • WASTEWATER • STORMWATER • EROSION CONTROL,

Ms.Kelly Johnson 2 July 15,2009
Ocean Isle Beach 3`d&461 Street Extension
6. The drainage area on Sheet C-6 does consist only of right-of-way area.
7. The runoff volumes presented on pages 3 thru 12 of the calculations include 1 Y2" runoff
from both the roadway and the non-BUA areas (i.e., 100'%0 of the 1 W' rainfall over the
entire project area).
8. A statement about wetlands currently exists in the Stormwater Narrative on Sheet C-7. For
the purpose of clarification,we have added an independent wetland note on Sheet C-1.
9. We have discussed the "Designer's Certification" for the original project with the Town.
Unfortunately, construction of the project was not certified. On behalf of the Town, we
respectfully request that the Town be allowed to "satisfy" this requirement by providing
certification for the current project following construction.
10. We have taken care to insure agreement among the calculations, plans, forms, and other
project documents.
Enclosed you will fmd two copies of each of the following:
1. revised calculation pages 2a and 2b;
2. new calculation page 15;
3. revised page 2 of the Application;
4. revised page 1 of the Infiltration Basin Supplement;and,
5. Revised Plan Sheets C-1 and C-6.
We appreciate your attention to this matter. Please contact us should you have any questions or
comments.
Sincerely,
Donald M.Covil,P.E.
Compass Pointe Engineering,P.A.
Enclosures
cc: Mr. Larry Sellers,Public Works Director,Town of Ocean Isle Beach

AVA
NCDENR
North Carolina Department of Environment and Natural Resources
Division of Water Quality
Beverly Eaves Perdue Coleen H. Sullins Dee Freeman
Governor Director
Secretary
July 13, 2009
Ms. Debbie Smith, Mayor
Town of Ocean Isle Beach
3 West 3rd Street
Ocean Isle Beach, NC 28469
Subject: Request for Additional Information
Stormwater Project No. SW8 980504
Ocean Isle Beach 3"I and 4th Street Extension
Brunswick County
Dear Mr. Durham:
The Wilmington Regional Office received a State Stormwater Management Permit
Application for the project located on 3rd and 4th Streets on May 20, 2009. The Division
of Water Quality has conducted a preliminary review of that information and determined
that the application is not complete. The following information is needed to continue the
stormwater review:
1. Driveway & side road square footage: The current permit allows for 79,720 sf
of BUA consisting of a street and 96 driveways. The 96, 16-ft max driveways
are allotted 30,720 sf of BUA. Page 2a of the calculations discusses existing
and future driveways and side roads. The existing and future driveways and
side roads total 26,410sf, which is less than the 30,720sf currently permitted
for driveways. (2,580+1,000+0+1,320+11,340+9,720+0+450=26,410sf).
a. What does "not considered" mean in your calculations? Does "not
considered" make up the difference between 26,410 and 30,720?
b. "Side roads"were not discussed in the previous permit. Do "side
roads" make up the difference between 26,410 and 30,720?
c. Is it your intention to distinguish between existing and future driveways
and side roads in the revised permit?
2. Street square footage: The 20ft wide street is allotted 49,000 sf of BUA,
which would mean it is 2,450 ft long. If the street width is increased 10ft, then
the street BUA would increase by 24,500 sf.(=10ft*2,450ft) to 73,500sf. Page
2a of the calculations show 72,450sf. How was 72,450sf determined? (It
could be that the road is not perfectly straight and that the area calculation is
not completely linear, but I wanted to ensure that this value is correct.)
3. Stream index: Please provide the stream index number.
Wilmington Regional Office
127 Cardinal Drive Extension,Wilmington,North Carolina 28405 One
Phone:[phone] FAX:[phone]\Customer Service:1-877-623-6748 NO Carolina
Internet:www.ncwaterqualittr.org `,� tura/lr�
An Equal Opportunity l Affirmative Action Employer Na

SW8 980504
July 13, 2009
-4. Street volume: The area built unpermitted will be subject to the SL2008-211
volume requirement (1yr24hr pre/post) if in SA waters. It appears that it was
calculated at 1.5"? Is that an error or is some/all of the area outside of the
half-mile?
—5. Drawdown time:
a. SA Volume: If the new area is in SA, then please also adjust the
drawdown calculation.
,mob. Depth in swale: On the current drawdown calculation a depth of 18" is
used on page 13. Is that the average storage depth in the swale? I
don't see that value on page 12. We typically see the drawdown time
as Time=Volume/BottomArea/InfilRate.
Drainage area: Sheet C-6 shows the drainage area. Does this area consist
only of right of way area? 4 5
Dti, Q�'''��s� 7. Reported Volume Table (Pages 3-6): The background section of your
k``e.)-` submittal says that the entire 1.5" volume is used as the treatment volume
rather than the Simple Method. Does that mean that you determined the
volume on pages 3-6 by taking the entire area (streets and swales) at 1.5"?
t8' Wetlands: Please insert a note that there are no wetlands onsite if that is the
case.
s ------- 9. Designer's Certification: Please submit either a DC or a partial DC.
-6. Updating calculations: Please note that a revision to one number may have a
domino effect on other numbers, which may require revision of the
applications, calculations, supplements, plans, details, and associated
documentation. Please verify all numbers are correct to ensure consistency
in the application documents. I have made considerable effort to identify
areas of concern, however, because substantial changes are warranted
please carefully review your re-submittal in order to ensure that all of the
required items are submitted and correct. Please also note that any
calculations in your re-submittal must be stamped.
Please note that this request for additional information is in response to a preliminary
review. The requested information should be received in this Office prior to August 13,
2009, or the application will be returned as incomplete. The return of a project will
necessitate resubmittal of all required items, including the application fee.
If you need additional time to submit the information, please mail, email or fax your
request for a time extension to the Division at the address and fax number at the bottom
of this letter. The request must indicate the date by which you expect to submit the
required information. The Division is allowed 90 days from the receipt of a completed
application to issue the permit.
The construction of any impervious surfaces, other than a construction entrance under
an approved Sedimentation Erosion Control Plan, is a violation of NCGS 143-215.1 and
is subject to enforcement action pursuant to NCGS 143-215.6A.
Page 2 of 3

SW8 980504
July 13, 2009
Please reference the State assigned project number on all correspondence. Any
original documents that need to be revised have been sent to the engineer or agent. All
original documents must be returned or new originals must be provided. Copies are not
acceptable. If you have any questions concerning this matter please feel free to call me
at [phone] or email me at [e-mail]
Sincerely,
00111i
ill: Jo Opron
Environmental Engineer
GS/KJ: S:\WQS1STORMWATER\ADDINFO\20091980504.jui09
CC: Donald Covil, PE, Compass Pointe Engineering
Stormwater Permitting, WiRO files
Page 3 of 3

cow ttirie
L Phone: [phone]
6934-6 Beach Drive, SW Fax: [phone]
Ocean Isle Beach, NC 28469 Email: [e-mail]
tiv
01
ion
Monday,May 18,2009 fi c'i
Mr.David Cox,Senior Environmental Specialist `' lj
NCDENR,DWQ 5
127 Cardinal Drive Extension
Wilmington,North Carolina 28403
Subject: Stormwater Permit No.SW8980504 RenewalModificatiion
3th and 4th Street Extension
Town of Ocean Isle Beach
Dear Mr. Cox:
On behalf of the Town of Ocean Isle Beach, we are submitting herewith documents that
constitute the Town's request for renewal and modification of the subject stormwater permit. In
particular,you will find enclosed:
1. original and one copy of the Stormwater Management Permit Application Form;
2. one copy of the Infiltration Basin Supplement;
3. original of the Infiltration Basin Operation and Maintenance Agreement;
4. original of the Infiltration Basin Required Items Checklist;
5. one copy of calculations;
6. two sets of project plans; and,
7. check in the amount of$505 to cover the application fee.
Please note that we have not included a soils report since the soils documentation accompanying
the original submittal still applies.
We appreciate your attention to the this matter. Please contact us should you have any questions
or comments.
Sincerely,
LIWD
MAY 2 0 2009
Donald M. Covil,P.E.
Compass Pointe Engineering,P.A. BY:
Enclosures
cc: Mr. Larry Sellers,Public Works Director, Town of Ocean Isle Beach
LAND PLANNING & SITE DESIGN • WATER • WASTEWATER • STORMWATER • EROSION CONTROL

CALCULATIONS AND NOTES
Ocean Isle Beach 3" and 4tb Street Extension
Stormwater Management Plan Renewal/Modification
DWQ Permit No. SW 8 980504
�� „,�R RECEIVED
,� @ 0.n; D�aI/ MAY 2 0 2009
5//',v
SEAL `'•1D = BY:SW 8`1 R)SO4-
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Compass Pointe Engineering,PA
Ocean Isle Beach,NC

CALCULATIONS AND NOTES
Revised pages 2a & 2b
New page 15
Ocean Isle Beach 3rd and 4th Street Extension
Stormwater Management Plan Renewal/Modification
DWQ Permit No. SW 8 980504
40.5117y.
2
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if4 ' 'f SEAL
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Tills 9499 '1 .
' moo 411. �;. i%'`N.Ac JU
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Compass Pointe Engineering,PA
Ocean Isle Beach,NC

Ocean Isle Beach 3`d&4th Street Extension DMC
3/27/2009
BACKGROUND
DWQ issued high density SW Permit Number SW8 980504 Modification for this project
on April 30, 1999. The original project included a 20' wide roadway, whereas a 20' wide
roadway with 5' bike lanes on each side was subsequently constructed. The current
project,therefore, represents a renewal (due to a 10-year renewal period) and a
modification(since the paved roadway is 10' wider than that covered by the original
permit).
41 It is noted that the original calculations treated the entire area between the right-of-way
lines (swales included) as impervious. This was done because the rainfall would fall
4) directly on the surface of the infiltration swales as well as the roadway; hence,the
o, volume of runoff treated does not change even though the actual amount of impervious
-e CO,area increases. Further, an additional conservative element was incorporated during
4., . original design in that the entire 1 'A"rainfall was used as the treatment volume.(i.e.,the:
C� BMP Manual "Simple Method"was not used to reduce the "runoff'amount).
The current design incorporates the same conservative elements as the original design.
The full 1 'A"rainfall over the full width of the right-of way(including the roadside
swales and existing and future side roads and driveways)is considered the treatment
volume.
The original project presents the infiltration characteristics of the swale soils to be in
excess of 20 inches/hour. The current project uses the same value.
Even though the roadway width has been increased from 20' to 30',the shape and extent
of the typical infiltration swale section remains unchanged. The runoff storage area and
volume is basically unchanged from the original project.
Given all the above, it follows that the proposed stormwater swales will be adequate to
handle the runoff as required for the new roadway system. Nonetheless, new calculations
were performed and plans and profiles were revised to demonstrate the adequacy of the
proposed design.

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Precipitation Frequency Data Server Page 1 of 1
POINT PRECIPITATION
FREQUENCY ESTIMATES i
FROM NOAA ATLAS 14
NORTH CAROLINA 33.8892 N 78.4406 W 0 feet
from"Precipitation-Frequency Atlas of the United States"NOAA Atlas 14,Volume 2,Version 3
G.M.Bonnie,D.Martin,B.Lin,T.Paroybolc,M.Yekta,and D.Riley
NOAA,National Weather Service,Silver Spring,Maryland,2004
Extracted.Fri Mar 277 200?
070 Fr : !fi r_ j 'O 4.04 -j
Precipitation Frequency Estimates(inches)
ARI* 5 10 15 30 60 120 6 h 1Z h 24 10 20 30 45 60
(years) min min in min min min r hr 48 hr 4 aav 7 dam dda dam g y day dda
1 0.51 0.81 1.02 1.39 1.74 2.07 2.23 ®3.22 3.73 4.36 14.86 5.58 6.29 8.43 10.45 13.02 15.66
1 2 0.60 0.96 ®11.67 12.10 ®2.71 3.33 3.91 4.53 5.27 5.87 6.73 7.53 10.04 12.41 15.39 18.45
5 0.70 1.12 mg 2.01 mg mg 3.42 [4.22 4.98 5.86 6.76 7.43 8.45 9.31 112.21 14.86 18.17 21.54
10 0.78 gag gmi 2.29]2.98 pm 4.07 5.03 5.97 7.00 8.03 8.74 9.86 10.77 13.99 16.80 20.38 123.95
25 0.88 1.40 mg 2.63 ®ma 4.97 6.17 .'mig 9.93 10.67 11.90 Min 16.46 19.46 23.38 27.14
1 50 0.96 1.53 l 1.93 2.91 3.94 mg 5.77 mg 8.65 10.24 ®112.311 13.60 14.57 18.48 21.58 25.73 129.61
100 1.04 1.65 2.08 3.19 4.39 5.89 6.63 mg 10.03 11.93 113.40 14.10 15.43 16.41 20.60 23.74 28.12 32.05
200 -® 1.76 12.22 3.46 4.86 6.65 7.58 9.50 11.59 13.84 1MM 16.07 17.41 MEI 22.83 125.97130.55 34.49
500 ® 1.92 gm Enj 5.50 mg 8.97 ® 13.92 16.76 18.54 19.05 120.28 121.19125.97 29.03 ElE3 37.72
1000 1.29 2.04 2.56 am 6.05 8.69 10.21 12.93 16.03 119.32 ®21.61 22.67 23.52 MEI Mal 36.43 40.18
•These predpitaoon frequency estimates are based on a partial duration series.ARI is the Average Reaureece Interval.
Please refer to NOAA Atlas 14 Document for more information.NOTE Formatting forces estimates near zero to appear as zero.
*Upper bound of the 90%confidence interval •
Precipitation Frequency Estimates(inches) ,
ARI** 5 10 15 30 160 120 3 6 12 124 48 4 7 10 20 30 45 60
(years) min min •min min min min hr hr hr hr hr day day day day day day day
:1 -0-.55 0.88 1.10 1.50 mg 2.26 12.46 3.03. 3.59 Egg mg 5.30 6.04 1-19.01 mg mm 16.54
®0.65 1.04 ®mg®®2.99 3.69 4.36 5.02 gm 6.41 7.29 8.12 10.76 13.23 16.33 19.50 .
,5 0.75 ®®®mg 3.46 3.77 4.66 5.56 6.48 7.47 '.9.15 10.04 13.07 11821119.28122.74 :
10 0.84.®®1m®4.08 m3 mm 6.65 m 8.87 19.54 10.69 11.62 114.95117.90 21.63 MEI
25 0.95 ®1.92 sm mg 4.92 m n 8.20 9.63 10.96 11.64 12.90 13.86 17.61 20.75 MEI 28.67 •
50 1.03 1.64 2.08 mg 14.25 5.64 6.35 7.90 9.59 11.29 12.79 Mal MEI MEZ1 19.80 23.05 27.36
100 gs mg Eim gm mg 1E4711 7.29 9.10 11.11 13.18 MIM Maj 16.78 17.75 22.13 25.41 29.96 33.97
200 1.20 1.90 12.40 jump mg®8.31 10.43 12.82 ®Ran17.67 18.99 19.95 24.62 32.66 36.64
500 ®2.07 2.60 4.14 5.95 MI 9.86 18.62 20.73 121.08 122.27 23.16 28,20 ®36.39 140.26
1000 1.40 Jmg 4.49 6.56 9.48 ® 14.23 ®121.58 al324.08 25.06 25.89 ®34.10 39.35 43.09
•The upper bound of the confidence interval at 90%confidence level Is the value which 5%of the simulated quango values for a given frequency are greater than.
"These precipitation frequency estimates are based on a partial duration aeries,ARI is Ire Average Rewnerrce Interval.
Please refer to NOAA Alas 14 Doomnem for more information.NOTE Formal ing prevents estimates near zero to appear as zero.
*Lower bound of the 90%confidence interval
Precipitation Frequency Estimates(inches)
AR1** 5 10 15 30 60 120 3 6 12 24 48 4 7 10 20 30 145 60
(years) min min min min min min hr I hr hr hr hr day day day day day day day
1 0.47 0.75 0.94 1.29 1.61 1.91 2.05 ®2.92 mg 3.99 4.48 ®5.86 7.90 9.84 12.28 gni
2 0.56 0.90 gm mg IT9T1®mg 3.05 3.54 4.14 4.83 16.24 17.01 9.41 11.68 14.52 17.46
5 0.65 1.03 ® 1.86 mg 2.91 ®3.85 4.50 ®6.17 6.83 MEE 8.64 11.43 13.96 17.13 120.351
10 1-1® 1.46 ®®mg 3.70 4.56 mg 6.36 7.30 8.02 9.10 9.98 13.06 15.75 19.18 MEI
25 0.81 1.29 1.63 mg®mg 4.50 5.56 6.59 7.86 179.71 10.92 11.85 15.30 MEI121.93 Mal
50 0.88 1.40 ®[2.67 3.61 4.70 5.19 6.43 7.67 9.14 10.33 11.12 12.40 13.35 17.09 20.07 24.05 27.74
100 0.94 1.50 1.89 2.90 L.99 1131I 5.92 [7.35 mg 10.54 Ka 12.62 13.96 14.92 18.92 121.98 126.15 29.90
200 1.00 1.59 2.01 ®4.39 5.95 6.71 '.10.07 12.07 13.49 14.24 15.60 16.55 20.81 23.90 MEI 32.02
500 1.08 no 2.16 gm 4.93 6.86 7.84 9.80 11T92 [1433 15.90 16.61 17.91 118.84123.39 26.45 31.041134.771
11 1000 1.15 1 1.81 i1:E27 113.68 1537 117.63 18.82 11.08 13.53 16.24 17.93 118.58119.79 20.67 25.41 28.41 33.16 36.84
•The lower bound of the confidence interval at 90%confidence teed I the value which 5%of the simulated quartile values for a given frequency are less hart
"These precipitation frequency estimates are based on a partial duration madma series,ARI Is the Average Recurrence IntevaL
Please refer to NOAA Mae 14 Document for more Information.NOTE Formatting prevents estimates near zero to appear as zero.
TPA version dt#apre's:_ .- f
http://hdsc.nws.noaa.gov/cgi-bin/hdsc/buildout.perl?type--pf&units=us&series---pd&statena... 3/27/2009

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Ocean Isle Beach 3rd and 4th Street Extension
Runoff and Storage Calculations for Swale on North Side
Future Driveways Not Considered
I Runoff Volume I Beginning I Ending Average StorageI
Section I.D. Based on 1.5" Storage Volume(CF) NET Excess
Rainfall Station Station Depth(Ft) Incremental Accumulated Storage(CF)
1024 1040 1.55 173 173
NI
-7 285 1040 1060 1.27 145 318
1060 1080 0.98 86 405 164
1080 1100 0.70 44 449
1100 1120 1.55 216 216
1120 1140 1.28 147 364
1140 1160 1.01 92 455
1160 1180 0.74 49 505
1180 1200 0.47 20 525
1200 1220 0.20 4 528
1220 1240 0.35 11 539
N-2 1088 1240 1260 0.50 23 562 17r
1260 1280 0.65 38 600
1280 1300 0.80 58 657
1300 1320 0.95 81 739
1320 1340 1.10 109 848
1340 1360 1.25 141 988
• 1360. 1380 1.34 162 1150
1380 1390 1.55 108 1258
1390' 1400 .0.9 36 36 1
N-3 263 1400 1420 1.12 113 149
1420 1440 1.33 159 309 262
1440 1460 1.55 216 525
NO STORAGE AVAILABLE... EXISTING
1460 1580 DRIVEWAYS/YARD
1580 1600 0.55 27 27
N-4 825 1600 1620 0.80 58 85 -273
1620 1640 1.05 99 184
1640 1660 1.30 152 336
1660 1680 1.55 216 552
1680 1700 0.60 32 32
1700 1720 0.82 61 93
1720 1740 1.05 99 192
-
1740 1760 1.27 145 337
1760 1780 1.50 203 540
1780 1800 1.50 203 742
1800 1820 1.50 203 945
N-5 1200 1820 1840 1.52 208 1153
1840 1860 1.55 216 1869 1571
•
1860 1880 1.55 216 1585
1880 1900 1.52 208 1793
-
1900 1920 1.50 203 1996
1920 1940 1.49 200 2195
1940 1960 1.47 194 1 2390
1960 1980 1.46 192 2582
1 1980 2000 1.45 189 2771
Compass Pointe Engineering,P.Q. DMC
Ocean Isle Beach,NC
3/23/09

2000 2020 1.45 189 189
2020 2040 1.40 176 366
N-6 450 2040 2060 1.35 164 530
2060 2080 1.30 152 682 589
2080 2100 1.25 . 141 822
2100 2120 1.55 216 1039
2120 2140 0.90 73 73
2140 2160 0.96 83 156
2160 2180 1.03 95 251
2180 2200 1.09 107 358
2200 2220 1.16 121 479
2220 2240 1.22 134 613
2240 2260 1.29 150 763
2260 2280 1.35 164 927
2280 2300 1.42 181 1109
2300 2320 1.48 197 1306
2320 2340 1.55 216 1522
2340 2360 1.55 216 1738
2360 2380 1.55 216 1954
2380 2400 1.55 216 2171
2400 2420 1.55 216 2387
2420 2440 1.55 216 2603
2440 2460 1.47 194 2798
N-7 2689 2460 2480 1.40 176 2974 2018
2480 2500 _ . 1.33. 159 3133
2500 ' 2520 1.26 . 143 3276
2520 2540 1.19 127 3403
2540 2560 1.12 113 3516
2560 2580 1.04 97 3614
2580 2600 0.97 85 3698
2600 2620 0.90 73 3771
2620 2640 0.94 80 3851
2640 2660 0.98 86 3937
2660 2680 1.03 95 4033
2680 2700 1.07 103 4136
2700 2720 1.11 111 4247
2720 2740 1.16 121 4368
2740 2760 1.20 130 4497
2760 2780 1.32 158 4655
2780 2787 1.28 52 4707
2787 2837 NO STORAGE AVAILABLE.. EXISTING
DRIVEWAYS/YARD
2837 2840 1.42 27 27
2840 2860 1.46 192 219
2860 2880 1.51 205 424
N-8 424 2880 2890 1.55 108 532 109
2890 2950 NO STORAGE AVAILABLE... EXISTING
DRIVEWAYS/YARD
Compass Pointe Engineering,P.A. DMC
Ocean Isle Beach,NC 3/23/09

1
0
2950 2970 1.55 216 216
2970 2990 1.45 189 405
2990 3010 1.35 164 569
3010 3030 1.36 166 736
3030 3050 1.38 171 907
3050 3070 1.39 174 1081
3070 3090 1.4 176 1258
3090 3110 1.42 181 1439
9 1350 3110 3130 1.43 184 1623
3130 3150 1.44 187 1810 2013
3150 3170 1.46 192 2002
3170 3190 1.47 194 2196
3190 3210 1.48 197 2393
3210 3230 1.5 203 2596
3230 3250 1.51 205 2801
3250 3270 1.52 208 3009
3270 3290 1.54 213 3222
3290 3310 1.55 216 3439
N-10 113 3310 3330 1.00 90 90
3330 3340 1.55 108 198 86
3340 3395 NO STORAGE AVAILABLE....EXISTING
DRIVEWAYS/YARD
N-11 413 1 3395 I 3426 I 1 53 1 327 1 327 1 -86
_ '. 3426 3450
NO STORAGE AVAILABLE EXISTING
m. DRIVEWAYS/YARD
TOTALS 9098 IIIIIIMIIIIIIIIIIII 15796 6698
NOTES: 1. The shortfall in storage for N-4 will be"recovered"by the excess in downstream section N-5.
2. The shortfall in storage downstream of N-11 will not be recovered within a roadside
Compass Pointe Engineering,PA. DMC
Ocean Isle Beach, NC 3/23/09

Ocean Isle Beach 3rd and 4th Street Extension
Runoff and Storage Calculations for Swale on South Side
Future Driveways Not Considered
Runoff Volume Average
Section I.D. Based on 1.5" Beginning Ending Storage Storage Volume(CF) NET Excess
Rainfall Station Station Depth (Ft) Incremental Accumulated Storage(CF)
1031 1040 1.55 97 97
1040 1060 1.36 166 264
S-1 281 . 1060 1080 1.17 123 387 211
1080 1100 0.99 88 475
1100 1106 0.80 17 492
1106 1120 1.55 151 . 151
1120 1140 1.27 145 297
S-2 435 1140 1162 1.00 99 396 -39
1162 1222 NO STORAGE AVAILABLE... EXISTING
DRIVEINAY/YARD
1222 1240 0.60 29 29
1240 1260 0.76 52 81
1260 1280 0.92 76 157 ,
S-3 518 1280 1300 1.07 103 260 269
1300 1320 1.23 136 396..
1320 1340 1.39 174 570 '
1340 1360 1.55 216 786
1360 1380 0.15 2 2
1380 1400 0.35 11 13
1400 1420 0.55 27 40
S-4 563 1420 1440 0.75 51 91
•1440 1460 0.95 81 172 1
1460 1480 1.15 119 291
1480 1500 1.35 164 455
1500 1510 1.55 108 563
1510 1590 NO STORAGE AVAILABLE - EXISTING
DRIVEWAY/YARD
1590 1610 0.45 18 18
S-5 713 1610 1630 0.67 40 59
1630 1650 0.89 71 130 -204
1650 1670 1.11 111 241
1670 1690 1.33 159 400
1690 1700 1.55 108 508
Compass Pointe Engineering, PA DMC
Ocean Isle Beach, NC 1 3/22/09

1700 1720 0.85 65 65
1720 1740 1.01 92 157
1740 1760 1.17 123 280
1760 1780 1.34 162 442
1780 1800 1.50 203 644
1800 1820 1.50 203 847
1820 1840 1.50 203 1049
1840 1860 1.50 203 1252
1860 1880 1.50 203 1454
-6 1500 1880 1900 1.50 203 1657
1900 1920 1.46 192 1848 1385
1920 1940 1.41 179 2027
1940 1960 1.37 169 2196
1960. 1980 1.32 157 2353
1980 2000 1.28 147 2501
2000 2020 1.24 138 _ 2639
2020 2040 1.19 127 2766
2040 2060 1.15 119 2885
2060 2100 NO STORAGE AVAILABLE - EXISTING
DRIVEWAY/YARD
-
2100 2140 NO STORAGE AVAILABLE - SIDE
ROAD
2140 2160 . 1.15 119 119 1
2160 2180 1.16 121 240
2180 2200 . .1.18 . 125 365
2200 2220 1.19 127 493
2220 2240 1.20 130 622
2240 2260 1.24 138 761
S-7 1425 2260 2280 1.28 147 908
2280 2300 1.32 157 1065 672
2300 2320 1.36 166 1232
2320 2340 1.39 174 1406
2340 2360 1.43 184 1590
2360 2380 1.47 194 1784
2380 2400 1.51 205 1989
2400 2410 1.55 108 2097
2410 2480 NO STORAGE AVAILABLE - SIDE
ROAD
2480 2500 1.55 216 216
2500 2520 1.44 187 403
2520 2540 1.33 159 562
S-8 525 2540 2560 1.22 134 696 449
2560 2580 1.12 113 _ 809
I 2580 2600 1.01 92 901
2600 2620 0.90 73 974
Compass Pointe Engineering, PA DMC
Ocean Isle Beach, NC 2 3/22/09

0
2620 2680 NO STORAGE AVAILABLE - SIDE
ROAD
2680 2700 1.05 99 99
2700 2720 1.08 105 204
2720 2740 1.11 111 315
2740 2760 1.14 117 432
2760 2780 1.17 123 555
2780 2800 1.20 130 685
2800 2820 1.27 145 830
2820 2840 1.34 162 992
2840 2860 1.41 179 1171
8-9 2475 2860 2880 1.48 197 1368 1297
2880 2900 1.55 216 1584
2900 2920 1.46 192 1776
2920 2940 1.37 169 1945
2940 2960 1.28 147 2092
2960 2980 1.19 127 2220
2980 3000 1.10 109 2328
3000 3020 1.15 119 2448
3020 3040 1.20 130 2577
3040 3210 1.25 1195 3 772
3210 3280 NO STORAGE AVAILABLE - SIDE
ROAD
5-10 113 3280 3300 1.50 203 203
3300 3310 1.55 108 311 1.99
$-1 150 3310 3330 0.70 44 38
3330 3350 1.55 . 216 254 104
3350 3370 0.40 14 14
3370 3390 0.97 85 99
S-12 319 3390 3410 1.55 216 315 267
3410 3430 1.55 216 532
3430 3435 1.55 54 586
TOTALS 9015 r k �w nm . . '► � � 13631
4616
NOTES: 1. The shortfall in storage for S-2 will be"recovered"by the excess in downstream section S-1.
2. The shortfall in storage for S-5 will be"recovered"by the excess in downstream section S-6.
Compass Pointe Engineering, PA DMC
Ocean Isle Beach, NC 3 3/22/09

., .
. . .
, .
Ocean Isle Beach 3rd and 4th Street Extension
Runoff and Storage Calculations for Swale on North Side
with Future Driveways Considered
IGt. HIIJ.
Length of Runoff Volume Peic)YllorcP —
Length of SW Average Storage Storage Volume NET Excess Storage
Section I.D. Roadway Served Based on 1.5"
(Ft.) Rainfall Cp Swale(Ft.) Depth(Ft) (CF) (CF)
N-1 D 34 128 16 1.37 135 8
N-2D 50 188 32 1.37 270 83
N-3D 50 188 32 1.37 _270 83
N-4D 50 188 32 1.37 270 83
N-5D 32 120 32 1.43 294 174
N-6D 50 188 32 1.43 294 107
N-7D 50 188 32 1.43 294 107
N-8D 50 188 32 1.43 294 107
N-9D 50 188 32 1.43 294 107
N-10D 150 563 16 1.47 156 -407
N-11 D 50 188 32 1.45 303 115
N-12D 50. 188 32 1.45 303 115
N-13D 50 188 32 1.45 303 115
N-14D 50 188 32 1.52 333 145
N-15D 50 188 32 1.52 333 145
N-16D 50 188 32 1.52 333 145
N-17D 50 188 32 1.52 333 145
N-18D 50 188 32 1.52 333 145
N-19D 50 188 32 1.52 333 145
N-20D 50 188 32 1.52 333 145
N-21D 50 188 32 1.45 303 115
N-22D 50 188 32 1.52 333 145
N-23D 50 188 32 1.52 333 145`_
N-24D 50 188 32 1.52 333 145
l N-25D 50 188 -- 32 1.52 333 145
Compass Pointe Engineering, PA DMC
3-22-09

0
•
N-26D 50 188 32 1.52 333 145
N-27D 50 188 32 1.52 333 145
N-28D _ 67 251 32 1.52 333 81
N-29D 50 188 32 1.47 311 124
N-30D 50 188 32 1.45 303 115
•
N-31D 50 188 32 1.52 333 145
N-32D - 50 188 32 1.52 333 145
N-33D 50 188 32 1.52 333 145
N-34D 52 195 16 1.55 173 -22
N-35D 52 195 18 1.52 187 -8
N-36D 73 274 17 1.50 172 -102
N-37D 42 158 25 1.45 237 79
—
N-38D 58 218 41 1.45 388 170
N-39D 60 225 42 1.52 437 212
• N-40D . . 58. . ... . . 218 40 1.52 ;416 198
N-41 D 56 210 38 1.52 :395 i 185
N-42D 50 188 33 1.52 343 156
N-43D 50 188 33 1.52 343 156
N-44D 32 120 14 1.37 118 -2
NOT
TREATED 110 413 0 0 0 -413
TOTALS ;•��:�� ;��.�-�� ��'7 ,�� —
9098 V1 ,q r, 0 13263 4166
J
NOTES: 1. The shortfall in storage for N-10D will be"recovered"by the excess in downstream sections N-11 D, N-12D,N-13D,&N-14D.
2. The shortfall in storage for N-34D, N-35D,&N-36D will be"recovered"by the excess in downstream sections N-33D&N-
37D.
3. The shortfall in storage downstream of N-44D will not be recovered within a roadside swale.
Compass Pointe Engineering, PA DMC
3-22-09

Il
Ocean Isle Beach 3rd and 4th Street Extension
Runoff and Storage Calculations for Swale on South Side
with Future Driveways Considered
Length of Runoff Volume Length of SW Average Storage Storage Volume NET Excess
Section I.D. Roadway Served Based on 1.5" Swale(Ft.)
(Ft.) Rainfall ( ) Depth Ft( ) (CF) Storage(CF)
S-1 D 76 285 76 1.10 414 129
S-1 Da 102 383 54 1.27 392 9
S-2D 80 300 69 1.33 549 249
S-3D 50 188 32 1.43 .294 107
S-4D 50 188 32 1.43 294 107
S-5D 50 188 32 1.43 294 107
S-6D 50 188 32 1.43 294 107
S-7D ;.150 563 32 1.43 294 : I -268
S-8D . 50 :... .:;... 188 32,. .. ..,.. 1.43.. . 294: . 107.
S-9D 50 188 . 32 . 1.43 294,: . , 107
S-10D ,. 50 - 188 -32 . .. 1.52 -C- 333•'. .. .I 145 --- - --
S-11 D ! 68 255 32 1.52 333 , . 78
— S-12D I 50 188 32 1.52 333 L 145
S-13D 50 188 32 1.52 333 145
S-14D ii _ 50 188 32 1.52 333 145
S-15D 92 345 32 1.52 333 -12
H — -
S-16D 90 338 32 1.53 337 0
S-17D 50 188 32 1.52 333 145
S-18D 50 • 188 32 1.52 333 — 145
S-19D 50 188 32 1.52 333 145 —
i
S-20D 50 188 32 1.52 333 145
S-21D 83 311 15 1.52 156 -155
S-22D 35 131 16 1.52 166 L 35
S-23D 50 188 32 1.47 311 124
f._
[ S-24D 62 233 32 1.45 303 70
S-25D 120 450 32 --- 1.52 333 -117
Compass Pointe Engineering, PA AMC
Ocean Isle Beach, NC 3-22-09

S-26D 50 188 32 1.52 333 145
S-270 50 188 32 1.50 324 137
S-28D 68 255 32 1.50 324 69
S-29D 50 188 32 1.45 303 115
S-30D 41 154 33 1.45 312 158
S-31 D 62 233 33 1.45 312 80
S-32D 53 199 35 1.52 364 165
S-33D 70 263 52 1.52 541 278
S-34D 56 210 26 1.52 270 60
S-35D 70 263 40 1.52 416 153
S-36D 53 199 70 1.18 439 240
S-37D 35 131 35 1.13 201 70
S-38D 38 143 .. 20 • 1.52 208 65
TOTALS ..._ �„ _
9015 z. a�‘ r ;` 12696 . 3681
1. The shortfall in storage for S-7D wilt be"recovered"by the excess in downstream sections S-8D,S-9D,&S-10D.
' NOTES: 2: The shortfall in storage for S-.15D will be"recovered"by the excess in downstream section S-14D.
3: The shortfall in storage for S-21 D will be"recovered"by the excess in downstream sections S-20D&S-22D.
4. The shortfall in storage for S-25D will be"recovered"by the excess in downstream section S-26D.
Compass Pointe Engineering, PA DMC
Ocean Isle Beach, NC 3-22-09

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Raleigh, North Carolina 35.8706N. 78.7864W
ARI* 5 min. 10 min. 15 min. 30 min. 60 min. 120 min. 3 hr. 6 hr. 12 hr. 24 hr.
(years)
2 5.58 4.46 3.74 2.58 1.62 0.94 0.66 0.40 0.24 0.14
10 7.08 5.66 4.78 3.46 2.25 1.33 0.95 0.58 0.34 0.021
25 7.78 6.19. 5.24 3.88. 2.58 1.54 1.11 0.68 0.41 0.24
100 8.64 6.86 5.78 4.43 3.05 1.85 1.36 0.84 0.51 0.30
Fayetteville. North Carolina 35.0583N. 78.8583W
ARI* 5 min. 10 min. 15 min. 30 min. 60 min. 120 min. 3 hr. 6 hr. 12 hr. 24 hr.
(years)
2 6.11 4.88 4.09 2.83 1.77 1.04 0.74 0.44 0.26 0.15
10 7.96 6.36 5.36 3.88 2.53 1.54 1.10 0.66 0.39 0.23
25 8.94 7,13 6.02 4.46 2.97 1.83 1.32 0.80 0.47 0.28
100 10.44 8.29 6.99 5.35 3.69 2.29 1.69 1.03 0.62 0.36
Wilmington, North Carolina 34.2683N. 77.9061W
ARI* 5 min. 10 min. 15 min. 30 min. 60 min. 120 min. 3 hr. 6 hr. 12 hr. 24 hr.
(years)
2 7.39 5.92 4.96 3.42 2.15 1.28 0.91 0.56 0.33 0.19
10 9.70 7.75 6.54 4.74 3.08 1.94 1.39 0.87 0.51 0.30
25 10.98 8.75 7.40 5.48 3.65 2.38 1.73 1.08 0.64 0.38
100 12.92 10.27 8.65 6.63 4.56 3.18 2.37 1.49 0.89 0.53
Washington. North Carolina 35.5333N. 77.0167W
ARI* 5 min. 10 min. 15 min. 30 min. 60 min. 120 min. 3 hr. 6 hr. 12 hr. 24 hr.
(years)
2 6.41 5.12 4.29 2.96 1.86 1.10 0.78 0.47 0.27 0.16
10 8.38 6.70 5.65 4.09 2.66 1.64 1.19 0.72 0.42 0.25
25 9.48 7.55 6.38 4.73 3.15 1.99 1.46 0.88 0.52 0.31
100 11.16 8.87 7.47 5.72 3.94 2.58 1.93 1.18 0.70 0.42
Manteo Airport. North Carolina 35.9167N. 75.7000W
ARI* 5 min. 10 min. 15 min. 30 min. 60 min. 120 min. 3 hr. 6 hr. 12 hr. 24 hr.
(years)
2 6.46 5.16 4.32 2.99 1.87 1.08 0.79 0.48 0.29 0.17
10 8.47 6.77 5.71 4.14 2.69 1.62 1.20 0.74 0.44 0.27
25 9.56 7.62 6.44 4.77 3.17 1.96 1.47 0.91 0.54 0.33
100 11.26 8.95 7.54 5.77 3.98 2.54 1.95 1.21 0.73 0.44
Cape Hatteras. North Carolina. 35.2322N. 75.6225W
ARV' 5 min. 10 min. 15 min. 30 min. 60 min. 120 min. 3 hr. 6 hr. 12 hr. 24 hr.
(years)
2 7.20 5.75 4.82 3.33 2.09 1.29 0.94 0.58 0.34 0.20
10 9.41 7.52 6.35 4.60 2.99 1.93 1.43 0.89 0.53 0.31
25 10.66 8.49 7.18 5.31 3.54 2.33 1.75 .1.09 0.65 0.38
100 12.53 9.95 8.39 6.42 4.42 3.03 2.32 1.45 0.88 0.51
Rev.6/06
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November 21,2008
Mr. David Cox
Senior Environmental Specialist
NC Division of Water Quality
127 Cardinal Drive Ext.
Wilmington,NC 28403
Subject: Stormwater Permit No. SW8980504 Modification
3`d and 4th Street Extension
Brunswick County
Dear Mr. Cox:
Upon receipt of the Division of Water Quality correspondence dated September 4,2008
regarding the Coastal Stormwater Management Permit Number SW8980504
Modification to Town of Ocean Isle Beach for a High Density Stormwater Project,a site
evaluation was performed to determine compliance. Based on current conditions,it
appears a modification to the existing permit will be needed to satisfy the intent of
stormwater rules.
We plan to employ an engineering firm to submit a design modification on our behalf,
followed by a certification of completion as required.
Please let us know of more information is needed at this time.
Sincerely,
TOWN OF OCEAN ISLE BEACH
Cal-‘ ‹Av1/1-L---'-
Larry sellers RECEIVED
Assistant Town Administrator
NOV 2 4 2008
LS/ss BY:
-TOWN OF OCEAN ISLE BEACH/'THREE WEST THIRD STREET/OCEAN ISLE BEACH. NC 28469/[phone]-

Oof NA14 Michael F.Easley,Governor
•
William G.Ross Jr.,Secretary
1— North Carolina Department ofEnviranmeatand Natural Resources
3
p i-g 4 Alan W.Klimek,P.E.Director
Division of Water Quality
September 4,2008
Ms. Betty Williamson, Mayor
Town of Ocean Isle Beach
3 West Third Street
Ocean Isle Beach, NC 28469
Subject: Stormwater Permit No. SW8980504 Modification
e and 4th Street Extension
Brunswick County
Dear Ms.Williamson:
The Division of Water Quality issued a Coastal Stormwater Management Permit, Number SW8980504
Modification to Town of Ocean Isle Beach for a High Density Stormwater Project on April 30, 1999.This
permit expires on April 30,2009.Section .1003(h)of 15 A NCAC 2H .1000(the stormwater rules)
requires that applications for permit renewals shall be submitted 180 days prior to the expiration of a
permit and must be accompanied by a processing fee, which is currently set at$505.00. If this is still an
active project please complete and submit the enclosed renewal application in a timely manner. If this
project has not been constructed and a permit is no longer needed, please submit a request to have the
permit rescinded. If you have sold the project, or are no longer the permittee, please provide the name,
mailing address and phone number of the person or entity that is now responsible for this permit.
Enclosed is a form for change of ownership,which should be completed and submitted if the property
has changed hands.
Your permit requires that upon completion of construction and prior to operation of the permitted
treatment units a certification of completion be submitted to the Division from an appropriate designer
for the system installed. This is to certify that the permitted facility has been installed in accordance with
the permit, the approved plans, specifications and supporting documentation. Please include a copy of
the certification with your permit renewal request and processing fee. Enclosed is a copyof a sample
certification.Also enclosed is a new Operation and Maintenance agreement that shou be completed
and submitted along with your renewal application.
You should be aware that failure to provide the Designer's Certification and the operation of a
stormwater treatment facility without a valid permit, are violations of NC General Statute 143-215.1 and
may result in appropriate enforcement action including the assessment of civil penalties of up to
$10,000 per day.
If you have any questions, please feel free to contact us at 910-796-7215.
Sin ,
Georgette Scott, Stormwater Supervisor
Surface Water Protection Section
Wilmington Regional Office
Endosures
cc: Wilmington Regional Office
North Carolina Division of Water Quality Internet: www.ncevatersnralitv.org
127 Cardinal drive Extension Phone[phone] is Caroj1xlp
Wilmington,NC 28403 Fax [phone] atrurallrV