SW8980504_Current Permit_20100614

A7,17,A
NCDENR
North Carolina Department of Environment and Natural Resources
Division of Water Quality i
Beverly Eaves Perdue Coleen H.Sullins Dee Freeman
Governor Director Secretary
June 14, 2010
Honorable Debbie Smith, Mayor
Ocean Isle Beach
3 West 3r Street
Ocean Isle Beach, NC 28469
Subject: State Stormwater Mnagement Permit No. SW8 980504MOD
Ocean Isle Beach 3' & 4th Street Extension
High Density Commercial infiltration Swale Project
Brunswick County
Dear Mayor Smith:
The Wilmington Regional Office receivecl_a complete, modified Stormwater Management Permit
Application for Ocean Isle Beach 3 & 4t Street Extension on May 28, 2010. 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. SW8
980504MOD dated June 14, 2010, for the construction of the subject project.
This permit shall be effective from the date of issuance 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 final.and
binding.
If you have any questions, or need additional information concerning this matter, please contact Chris
Baker, or me at [phone].
Sincerely,
22'.gee-iL -D S-— qi
Georgette Scott
Stormwater Supervisor
Division of Water Quality
GDS/csb: S:11. .SCSISTORMWATER\PERMIT1980504MOD.jun10
cc: Don Covil, P. E., Compass Pointe Engineering
Brunswick County Building Inspections
Brunswick County Engineering
Wilmington Regional Office
Stormwater File
Wilmington Regional Office One
127 Cardinal Drive Extension,Wilmington,North Carolina 28405 N o1 the ar lina
Phone:[phone] FAX:[phone] Customer Service:1-877-623-6748 ��J�r f���
Internet:www.ncwaterquality.org

State Stormwater Management Systems
Permit No. SW8 980504MOD
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
Town of Ocean Isle Beach
Ocean Isle Beach 3'ci and 4tt' Street Extension
West 3rd St. beginning at its intersection with Clinton St, Brunswick County
FOR THE
construction, operation and maintenance of an infiltration system consisting of a series
of infiltration swales to treat road runoff and 78 infiltration trenches to treat connecting
driveway runoff in compliance with the provisions of 15A NCAC 2H .1000 (hereafter
referred to as the "stormwater rules') and the approved stormwater management plans
and specifications and other supporting data as attached and on file with and approved
by the Division of Water Quality and considered a part of this permit.
This permit shall be effective from the date of issuance until 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 1.7 of this permit. The stormwater controls labeled
DA1 North Side Road and DA2 South Side Road, have been designed to handle
the runoff from 40,050 and 37,510 square feet of impervious area, respectively.
3. Each of the 78 individual driveway infiltration trenches is designed to treat that
portion of the driveway that extends across 15' of right-of-way from the lot
property line to the edge of the existing street. The north side has 42 lots with 35'
wide driveways and the south side has 36 lots with 36' wide driveways. Minimum
driveway trench requirements are provided in Section 1.7 of this permit.
4. Each driveway trench and roadside swale will be limited to treating that amount
of built-upon area indicated in Section 1.7 of this permit, and per approved plans.
5. All of the proposed stormwater collection and treatment systems for this project
are located within the public right-of-way.
Page 2 of 8

State Stormwater Management Systems
Permit No. SW8 980504MOD
6. The runoff from all built-upon area within the permitted drainage area of this
project must be directed into the permitted stormwater control system.
7. The following design criteria have been permitted for the infiltration swales and
for each driveway trench must be provided and maintained at design condition:
DA#1 DA#2 I DA#3 DA#4
North Side South Side North Side South Side
Swale Swale Driveway Driveway
Trench 0 Trench 0
a. Drainage Area, acres: 1.16 1.16 - -
Onsite,ft2: 50,730 50,430 525 540
Offsite,ft2 None None None None
b. Total Impervious Surfaces,ft2: 40,050 37,510 525 I 540
Onsite,ft2: 40,050 37,510 525 540
Offsite,ft2 None None None None
c. Number of Driveways N/A NIA 42 36
c. Design Storm, inches: 1.5 1.5 1.5 1.5
d. Swale Depth (V-Shape), feet: 1.45 avg 1.45 avg N/A N/A
e. Bottom Elevation, FMSL: Varies Varies Varies Varies
f• Available Swale Surface Area ft2: 4,351 5,421 N/A N/A _
Driveway Trench Bottom Surface Area,
ft2: N/A N/A 96 96
g. Bypass Weir Elevation, FMSL: Varies Varies 32"above 32"above
bottom bottom
h• Permitted Storage Volume,ft3: 6,376 7,199 51.0 51.0
i. Type of Soil: Sand Sand Sand Sand
j. Expected Infiltration Rate, in/hr: 20 20 20 20
k. Seasonal High Water Table, FMSL: Varies Varies Varies Vanes
30"-74" 30"-74" 30"-74" 30"-74
I. Time to Draw Down, hours: 0.24 0.24 0.24 0.24
M. Driveway Trench Length,ft: N/A N/A 16 16
n. Driveway Trench Width,ft: N/A N/A 6 6
o. Driveway Trench Height,ft: N/A N/A 1.67 1.67
p. Driveway Perforated Pipe Diameter,in: N/A N/A 8 8
q. Driveway Perforated Pipe Length,ft: N/A N/A 12 12
r. Receiving Stream/River Basin: Old South Creek, Eastern Channel/Lumber
s. Stream Index Number: 15-25-6
t. Classification of Water Body: SA;HQW
OPlease note that the drainage area, built-upon area and trench information provided for DA 3 and DA 4
is PER DRIVEWAY.
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. This modified permit is effective only if the Town of Ocean Isle Beach enacts a
driveway ordinance to ensure that the driveways within the right-of-way are
constructed with the required trenches. The ordinance will contain language
specific to the maximum swale obstruction width of 36', that the infiltration trench
system is constructed per the approved plans, that no means of piping under the
driveway are constructed, that no runoff from the road shall enter the driveway
trench system, and that the elevation of the top of the headwalls on each side of
the driveway within the right-of-way shall be no lower than the elevation of the
roadway centerline less 0.5 feet.
Page 3 of 8

State Stomiwater Management Systems
Permit No. SW8 980504MOD
3. The driveway ordinance must be fully enacted prior to allowing any of the
driveways on the affected lots to connect to this road. The permittee shall notify
the Division in writing when the driveway ordinance becomes effective.
4. During construction, erosion shall be kept to a minimum and any eroded areas of
the project or stormwater system will be repaired immediately. 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.
5. 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.
6. 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.
7. 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.
8. Upon completion of construction, prior to issuance of a Certificate of Occupancy,
and prior to operation of this permitted facility, a certification must be received
from an appropriate designer for the system installed certifying that the permitted
facility has been installed in accordance with this permit, the approved plans and
specifications, and other supporting documentation. Any deviations from the
approved plans and specifications must be noted on the Certification. A
modification may be required for those deviations.
9. Access to the stormwater facilities shall be maintained via appropriate recorded
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 all or any
part of the project area, defined as all property for which a 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.
Page 4 of 8

State Stormwater Management Systems
Permit No. SW8 980504MOD
12. Prior to the construction of any permitted future areas shown on the approved
plans, the permittee shall submit final site layout and grading plans to the
Division for approval.
13. A copy of the approved plans and specifications shall be maintained on file by
the Permittee at all times. At the time the permit is transferred to a new owner,
the permittee shall forward the approved plans to the new owner.
14. 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
1. This permit is not transferable to any person or entity except after notice to and
approval by the Director. At least 30 days prior to a change of ownership, or a
name change of the permittee or of the project, or a mailing address change, the
permittee must submit a completed and signed Name/Ownership Change form to
the Division of Water Quality, accompanied by the supporting documentation as
listed on the form. The approval of this request will be considered on its merits
and may or may not be approved.
2. The permittee is responsible for compliance with all permit conditions until such
time as the Division approves the transfer request. Neither the sale of the project
nor the conveyance of common area to a third party constitutes an approved
transfer of the stormwater permit.
3. Failure to abide by the conditions and limitations contained in this permit may
subject the Permittee to enforcement action by the Division of Water Quality, in
accordance with North Carolina General Statute 143-215.6A to 143-215.6C.
4. The issuance of this permit does not preclude the Permittee from complying with
any and all statutes, rules, regulations, or ordinances, which may be imposed by
other government agencies (local, state, and federal) having jurisdiction.
5. In the event that the facilities fail to perform satisfactorily, including the creation of
nuisance conditions, the Permittee shall take immediate corrective action,
including those as may be required by this Division, such as the construction of
additional or replacement stormwater management systems.
6. The permittee grants DENR Staff permission to enter the property during normal
business hours for the purpose of inspecting all components of the permitted
stormwater management facility.
7. The permit remains in force and effect until modified, revoked, terminated, or
renewed. The permit may be modified, revoked and reissued or terminated for
cause. The filing of a request for a permit modification, revocation and
reissuance, renewal or termination does not stay any permit condition.
8. Unless specified elsewhere, permanent seeding requirements for the stormwater
control must follow the guidelines established in the North Carolina Erosion and
Sediment Control Planning and Design Manual.
9. Approved plans and specifications for this project are incorporated by reference
and are enforceable parts of the permit.
Page 5 of 8

State Stormwater Management Systems
Permit No. SW8 980504MOD
10. 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 modified and reissued this the day day of month &year.
NORTH CAROLINA ENVIRONMENTAL MANAGEMENT COMMISSION
for ole H. Sullins, Director
Division of Water Quality
By Authority of the Environmental Management Commission
Page 6 of 8

State Stormwater Management Systems
Permit No. SW8 980504MOD
Ocean Isle Beach 3`d & 4th Street Extension
Stormwater Permit No. SW8 980504MOD
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 7of8

State Stormwater Management Systems
Permit No. SW8 980504MOD
Certification Requirements:
1. The drainage area to the system contains approximately the permitted
acreage.
2. The drainage area to the system contains no more than the permitted
amount of built-upon area.
3. All the built-upon area associated with the project is graded such that the
runoff drains to the system.
4. All roof drains are located such that the runoff is directed into the system.
5. The outlet/ bypass structure weir elevation is per the approved plan.
6. The outlet/ bypass structure is located per the approved plans.
7. A Trash Rack is provided on the outlet/bypass structure.
8. All slopes are grassed with permanent vegetation.
9. Vegetated slopes are no steeper than 3:1.
10. The inlets are located per the approved plans and do not cause short-
circuiting of the system.
11. The permitted amounts of surface area and/or volume have been
provided.
12. All required design depths are provided.
13. All required parts of the system are provided.
14. The required system dimensions are provided per the approved plans.
15. All components of the stormwater BMP are located in either recorded
common areas or recorded easements.
cc: NCDENR-DWQ Regional Office
Brunswick County Building Inspections
Page 8 of 8

�ra
Permit Number: 4)er
(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 kept in a
log in a known set location. Any deficient BMP elements noted in the inspection will be
corrected,repaired or replaced immediately. These deficiencies can affect the integrity
of structures,safety of the public,and the removal efficiency of the BMP.
Important maintenance procedures:
- The drainage area will be carefully managed to reduce the sediment load to the
infiltration basin.
- Immediately after the infiltration basin is established,the vegetation will be
watered twice weekly if needed until the plants become established (commonly
six weeks).
- No portion of the infiltration basin will be fertilized after the initial fertili7ation
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). I smooth it over and provide erosion
, control devices such as reinforced
turf matting or riprap to avoid
future problems with erosion.
RECEIVED
MAR 2 2 2010
Form SW401-Infiltration Basin O&M-Rev.3 jyy: 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
i damage have occurred at the Quality 401 Oversight Unit at 919-
outlet. 733-1786.
RECEIVvi
MAR 2 2 2010
B
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:(9 579-2166
Signa e:
Date: Z-I YJ-cbja
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, Sw 57-u. , a Notary Public for the State of
/VIJ ,. 4/1,d ,/NIq , County of Akio)501616 , do hereby certify that
pE66l E 5. 'N rn-I personally appeared before me this /7 Tµ
day of NMnui1 , ad/D , and acknowledge the due execution of the
forgoing infiltration basin maintenance requirements. Witness my hand and official seal,
{
•ze
SEAL
RECEIVED
My commission expires _ Mrtn/3�2 � 016ig MAR 2 2 2010
BY:_
Form SW401-Infiltration Basin O&M-Rev.3 Page 3 of 3

• Permit Number: ` 9.81 .5Dfrd
(to be provided by DWQ)
Drainage Area Number:
Infiltration Trench Operation and Maintenance Agreement
I will keep a maintenance record on this BMP. This maintenance record will be kept in a
log in a known set location. Any deficient BMP elements noted in the inspection will be
corrected,repaired or replaced immediately. These deficiencies can affect the integrity
of structures,safety of the public,and the removal efficiency of the BMP.
Important maintenance procedures:
— The drainage area of the infiltration trench will be carefully managed to reduce
the sediment load to the sand filter.
— The water level in the monitoring wells will be recorded once a month and after
every storm event greater than 1.0 inches (or 1.5 inches if in a Coastal County).
The infiltration trench 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 grass filter strip or Areas of bare soil and/or Regrade the soil if necessary to
other pretreatment area erosive gullies have formed. remove the gully,and then plant a
ground cover and water until it is
established. Provide lime and a
one-time fertilizer application.
Sediment has accumulated to Search for the source of the
a depth of greater than six sediment and remedy the problem if
inches. possible. Remove the sediment and
dispose of it in a location where it
will not cause impacts to streams or
the BMP.
The flow diversion The structure is clogged. Unclog the conveyance and dispose
structure(if applicable) of any sediment off-site.
The structure is damaged. Make any necessary repairs or
replace if damage is too large for
repair.
`dCEIVED
MAR 222010
$Y:
Form SW401-Infiltration Trench O&M-Rev.3 Page 1 of 3

BMP element: Potential problem: How I will remediate the problem:
The trench Water is ponding on the Remove the accumulated sediment
surface for more than 24 from the infiltration system and
' hours after a storm. dispose in a location that will not
impact a stream or the BMP.
The depth in the trench is Remove the accumulated sediment
reduced to 75% of the original from the infiltration system and
design depth. dispose in a location that will not
impact a stream or the BMP.
Grass or other plants are Remove the plants,preferably by
growing on the surface of the hand. If pesticide is used,wipe it on
trench. the plants rather than spraying.
The observation well(s) The water table is within one Contact the DWQ Stormwater Unit
foot of the bottom of the immediately at 919-733-5083.
system for a period of three
consecutive months.
The outflow pipe is clogged. Provide additional erosion
protection such as reinforced turf
matting or riprap if needed to
prevent future erosion problems.
The outflow pipe is damaged. Repair or replace the pipe.
The emergency overflow Erosion or other signs of The emergency overflow berm will
berm damage have occurred at the be repaired or replaced if beyond
outlet. repair.
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.
tAig4, 2 2 2010
BY:
Form SW401-Infiltration Trench 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: 2
Print name: Debbie S. Smith
Title: Mayor
Address: Town of Ocean Isle Beach, 3 West 3rd Street, Ocean Isle Beach,NC 28469
Phone: ( 579-2166
Signa e:
Date: .i-)/-,o1D
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, ,.5w . .$TU Aft , a Notary Public for the State of
ji/z id (4 ii 1/N1t , County of B itui,/S w0 GI6 , do hereby certify that
&UM' ,J. ,j/ti/7�J personally appeared before me this �7 T�
day of Milli- , o?D/b , and acknowledge the due execution of the
forgoing infiltration trench maintenance requirements. Witness my hand and official
seal,
,s STt /(''' gc- Ai-fiti/A)
(:40-rAiz4.
.3 'u�B��c► _ RECEIVED
'etc Cod MAR 2 2 2010
SEAL a '
My commission expires .yF 11 J 6•1Q. eV) a G/
Form SW401-Infiltration Trench O&M-Rev.3 Page 3 of 3

DWQ USE ONLY
Date Received Fee Paid Permit Number
„1"4<" *oe.-"s-,910// _542, ..ff4..Cat
State of North Carolina
Department of Environment and Natural Resources
Division of Water Quality
STORMWATER MANAGEMENT PERMIT APPLICAT /.. FU 11?
This form may be photocopied for use as an original
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 ) 755-5872
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)8/3/2009
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 ZSedimentation/Erosion Control ❑404/401 Permit [JNPDES 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 from the roadway,existing driveways serving 7 lots,
and future driveways serving 78 lots. The roadway and existing driveways will be served by roadside infiltration
swales. The future 78 lots will each be served by an individual subsurface infiltration system.
2. Stormwater runoff from this project drains to the Lumber River basin.
3. Total Property Area: 3.28 acres 4. Total Coastal Wetlands Area: 0 acres
5. Total Property Area(3) - Total Coastal Wetlands Area(4) = Total Project Area**: 3.28 acres
6. (Total Impervious Area/Total Project Area)X 100 = Project Built Upon Area(BUA): 83.3
7. How many drainage areas does the project have74
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.
B sin nf�q to ti DA 1 - NORTH SIDE ROAD a ` " gY DA 2 - SOUTH SIDE ROAD :.
Receiving Stream Name Eastern Channel,Old Sound Creek Eastern Channel,Old Sound Creek
Stream Class&Index No. SA;HQW 15-25-6 • SA;HQW 15-25-6
Total Drainage Area(sf) 50,730 50,430
On-site Drainage Area(sf) 50,730 50,430
Off-site Drainage Area(sf) 0 0
Existing Impervious*Area(sf) 40,050 37,510
Proposed Impervious*Area(sf) 0 0
%Impervious*Area(total) 78.9 74.4
Impervious SurfAce Axea :Drayage Areal • Piv. age.Area2
On-site Buildings(sf) 0 0
On-site Streets (sf) 36,390 36,060
On-site Parking (sf) 0 0 . •
On-site Sidewalks (sf) 0 0
Other on-site (sf) 3,660 1,450 4
ti
Off-site (sf) 0 0
Total (sf): 40,050 37,510 .�
*Impervious area is defined as the built upon area including,but not limited to,buildings,roads, 'J 'ng lltas,
sidewalks,gravel areas,etc.
**Total project area shall be calculated to exclude Coastal Wetlands from use when calculating the bui • g.n •
percentage calculation. This is the area used to calculate overall percent project built upon area(BLUA).
Form SWU-101 Version 09.25.08 Page 2 of 4

Supplement to Page 2, Section III.8
of STORMWATER MANAGEMENT PERMIT APPLICATION FORM
for
Ocean Isle Beach 3rd& 4th Street Extension—Modification
Town of Ocean Isle Beach,NC
April 2010
Drainage Area 3 Drainage Area 4
Basin Information Driveways—North Side Driveways—South Side
Receiving Stream Name Eastern Channel, Eastern Channel,
Old Sound Creek Old Sound Creek
Stream Class& Index No. SA;HQW 15-25-6 SA;HQW 15-25-6
Total Drainage Area(sf) 22,050 19,440
On-Site Drainage Area (sf) 22,050 19,440
Off-Site Drainage Area (sf) 0 0
Existing Impervious Area (sf) 0 0
Proposed Impervious Area (sf) 22,050 19,440
% Impervious Area (total) 100 100
Impervious Surface Area Drainage Area 3 Drainage Area 4
On-site Buildings(sf) 0 0
On-site Streets (sf) 0 0
On-site Parking (sf) 0 0
On-site Sidewalks(sf) 0 0
Other On-site(sf) 22,050 19,440
Off-site(sf) 0 0
Total (sf) 22,050 19,440 44,9

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 D
Form SW401-Cistern Cistern Supplement 1��EIVE�
MAR 222010
BY:
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/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.
'ties
• Original and one copy of the Stormwater Management Permit Application Form
• Original and one copy of the Deed Restrictions&Protective Covenants Form(if in/4
required as per Part IV above)
• Original of the applicable Supplement Form(s)and O&M agreement(s)for each BMP
• Permit application processing fee of$505(Express:$4,000 for HD,$2,000 for LD)
payable to NCDENR
• Calculations&detailed narrative description of stormwater treatment/management
• Copy of any applicable soils report Ste( „({4
• Two copies of plans and specifications(sealed,signed&dated),including:
-Development/Project name
-Engineer and firm
- Legend C'
-North arrow
-Scale kt4R
$
-Revision number&date P. vio
-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: 5041-3 Main Street
City: Shallotte State: NC Zip: 28470
Phone: (910 ) 755-5872 Fax: f910 ) 755-5875
Email:[e-mail]
VIII. APPLICANT'S CERTIFICATION
I, (print or type name of person listed in General Information,item 2) Debbie S.Smith
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,an that the proposed project complies with the requirements of 15A
NCAC 2H61\ •
Signature: [ ��� Date: '"/q'Ott/6
Form SWU-101 Version 09.25.08 Page 4 of 4

Permit No.`s l" f f. ',5"D7
(to be provided by DWQ)
o�W A7
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
NCDENR 401 CERTIFICATION APPLICATION FORM o^
INFILTRATION BASIN SUPPLEMENT
This form must be filled out,printed and submitted.
The Required Items Checklist(Part III)must be printed,filled out and submitted along with all of the required information.
I. PROJECT INFORMATION.
Project Name Ocean Isle Beach 3rd&4th Street Extension
Contact Person Donald M.Covil,P.E.
Phone Number [phone]
Date 4/16/2010 •
Drainage Area Number 1 - North Side Road
II:DESIGN INFORMATOO1
Site Characteristics
Drainage area 50,730.00 ft2
Impervious area 40,050.00 ft2
Percent impervious 0.79 %
Design rainfall depth 1.50 in
Peak Flow Calculations
1-yr,24-hr rainfall depth 3.73 in
1-yr,24-hr intensity 0:16 in/hr
Pre-development 1-yr,24-hr discharge 0;00 ft3/sec
Post-development 1-yr,24-hr discharge 0.00 ft3/sec
Pre/Post 1-yr,24-hr peak flow control 0.00 f13/sec
Storage Volume:Non-SA Waters
Minimum design volume required ft3
Design volume provided fts
Storage Volume: SA Waters
1.5"runoff volume 4819.00 ft3
Pre-development 1-yr,24-hr runoff volume 0:00 ft3
Post-development 1-yr,24-hr runoff volume 0:p0 ft3
Minimum required volume 4819.00 ft3
Volume provided 6,376.00 ft3 OK
Soils Report Summary
Soil type sand
Infiltration rate 20:00 in/hr
SHWT elevation varies..(>70"deep;fmsl
Basin Design Parameters
Drawdown time 0 01 days OK
Basin side slopes 4.50 :1 OK
Basin bottom elevation (varies) fmsl #VALUE!
Storage elevation (varies) fmsl
Storage Surface Area (varies) ft2
Top elevation (varies) fmsl RECEIVED
Basin Bottom Dimensions
Basin length (varies) ft MAY 2 8 2010
Basin width (varies) ft
Bottom Surface Area (varies) ft2
Form SW401-Infiltration 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 0K
Separation from impervious soil layer (n/a) 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)
} $ /010
Form SW401-Infiltration Basin-Rev.4 Parts I.&II.Design Summary,Page 2 of 2

Permit No.,5-4)T%/A- D/
(to be provided by DWQ)
��- oF WA
STORMWATER MANAGEMENT PERMIT APPLICATION FORMa jikuT
NCDENR 401 CERTIFICATION APPLICATION FORM ,Lr
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.
L PRO;lf.CT INFORMATLQN.
Project Name Ocean Isle Beach 3rd&4th Street Extension
Contact Person Donald M.Covil;P.E.
Phone Number [phone]
Date 4/16/2010
Drainage Area Number 2 - South Side Road
IL RESIGN:INFORMATION
Site Characteristics
Drainage area 50,430 00 ft2
Impervious area 37 510.00 ft2
Percent impervious 0.74 %
Design rainfall depth 150 in
Peak Flow Calculations
1-yr,24-hr rainfall depth 3.73 in
1-yr,24-hr intensity . 0.16 in/hr
Pre-development 1-yr,24-hr discharge 0.00 ft3/sec
Post-development 1-yr,24-hr discharge 0:00 ft/sec
Pre/Post 1-yr,24-hr peak flow control 0.00 ft3/sec
Storage Volume:Non-SA Waters
Minimum design volume required ft3
Design volume provided ft3
Storage Volume: SA Waters
1.5"runoff volume 4539.00 ft3
Pre-development 1-yr,24-hr runoff volume 0.00 ft3
Post-development 1-yr,24-hr runoff volume 0.00 ft3
Minimum required volume 4539.00 ft3
Volume provided 7,199.00 ft3 OK
Soils Report Summary
Soil type sand
Infiltration rate 20.00 in/hr
SHWT elevation varies(>70"deep;fmsl
Basin Design Parameters
Drawdown time 0.01 days OK
Basin side slopes 4 50 :1 OK
Basin bottom elevation (varies) fmsl #VALUE!
Storage elevation (varies) fmsl
Storage Surface Area (vanes) ft2
Top elevation (vanes) fmsl RECEIVED
Basin Bottom Dimensions
Basin length (varies) . ft MAY 2 8 2010
Basin width (vanes) ft
Bottom Surface Area (vanes) ft2
Form SW401-Infiltration 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/a) 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? (Na) (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)
vg,vV 'L '
Form SW401-Infi@ration Basin-Rev.4 Parts I.&II.Design Summary,Page 2 of 2

•
Permit No kifi �D
(to be provided by D
461:49A
oaofwtnr�QG
NCDENR STORMWATER MANAGEMENT PERMIT APPLICATION FORM a a
401 CERTIFICATION APPLICATION FORM
INFILTRATION TRENCH 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&4th Street Extension
Contact person Donald M.Covil,P E
Phone number [phone]
Date 4/16/2010
Drainage area number 3 (Typical system for future driveways for each of 36 lots south of 3rd&4th)
II. DESIGN INFORMATION . .
Site Characteristics
Drainage area 540.00 ft2
Impervious area 540.00 ft2
Percent impervious 100.0% %
Design rainfall depth 1.50 in
Peak Flow Calculations
1-yr,24-hr rainfall depth 3.73 in
1-yr,24-hr intensity 016 . in/hr
Pre-development 1-yr,24-hr discharge . 0.00 ft3/sec
Post-development 1-yr,24-hr discharge 0.00 ft3/sec
Pre/Post 1-yr,24-hr peak flow control 0.00 ft3/sec
Storage Volume:Non-SA Waters
Minimum volume required ft3
Volume provided ft3
Storage Volume:SA Waters
1.5"runoff volume 67.50 ft3
Pre-development 1-yr,24-hr runoff volume 0.00 ft3
Post-development 1-yr,24-hr runoff volume 0.00 ft3
Minimum volume required 67.50 ft3
Volume provided 72.50 ft3 OK
Soils Report Summary
Soil type sand
Infiltration rate 20.00 in/hr
SHWT elevation vanes(>70"deep;fmsl RECEIVE
Trench Design Parameters APR 19 2010
Drawdown time 0.01 days OK
Perforated pipe diameter in BY:
Perforated pipe length g.0 ft
Number of laterals 2
Stone type(if used) No.57 washed
Stone void ratio 40
Stone is free of fines? Y (Y or N) OK
Form SW401-Infiltration Trench-Rev.4 Parts I.&II.Design Summary,Page 1 of 2

Permit No.
(to be provided by DWQ)
Trench Elevations
Bottom elevation (varies) fmsl #VALUE!
Storage/overflow elevation 32"above bottom fmsl
Top elevation 20"above bottom fmsl
Trench Dimensions
Length(long dimension) 16.00 ft
Width(short dimension) 6.00 ft
Height(depth) 1.67 ft OK
Additional Information
Maximum volume to each inlet into the trench? 0.02 ac-in OK
Length of vegetative filter for overflow (n/a) ft 0K
Number of observation wells 1 0K
Distance to structure 25.00 ft OK
Distance from surface waters >150 ft OK
Distance from water supply well(s) >200 ft OK
Separation from impervious soil layer (n/a) ft OK
Depth of naturally occuring soil above SHWT >3 ft OK
Bottom covered with 4-in of clean sand? Y (Y or N) OK
Proposed drainage easement provided? (n/a) (Y or N) 0K
Capures all runoff at ultimate build-out? Y (Y or N) OK
Bypass provided for larger storms? (n/a) (Y or N) OK
Trench wrapped with geotextile fabric? Y (Y or N) OK
Pretreatment device provided Y
Form SW401-Infiltration Trench-Rev.4 Parts I.&II.Design Summary,Page 2 of 2

Permit No. % f/4752y
(to be provided by Q DW )
ap WArE9
1r "Z
NCDENR STORMWATER MANAGEMENT PERMIT APPLICATION FORM p
401 CERTIFICATION APPLICATION FORM
INFILTRATION TRENCH 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.
bI. PROJECT INFORMATION:
Project name Ocean Isle Beach 3rd&4th Street Extension
Contact person Donald M Covil,P E.
Phone number [phone]
Date 4/16/20W
Drainage area number 2 (Typical system for future driveways for each of 42 lots north of 3rd&4th)
il. DESIGN INFORMATION
Site Characteristics
Drainage area 525.00 ft2
Impervious area 525.00 ft2
Percent impervious 100.0% %
Design rainfall depth 1.50 in
Peak Flow Calculations
1-yr,24-hr rainfall depth 3.73 in
1-yr,24-hr intensity 0.16 in/hr
Pre-development 1-yr,24-hr discharge 0.00. ft3/sec
Post-development 1-yr,24-hr discharge 0,00 ft3/sec
Pre/Post 1-yr,24-hr peak flow control 0.00 ft3/sec
Storage Volume:Non-SA Waters
Minimum volume required ft3
Volume provided ft3
Storage Volume:SA Waters
1.5"runoff volume 65.63 ft3
Pre-development 1-yr,24-hr runoff volume 0.00 ft3
Post-development 1-yr,24-hr runoff volume _ 0.00 ft3
Minimum volume required 65.63 ft3
Volume provided 72.50 ft3 OK
Soils Report Summary
Soil type sand RECEIVED
Infiltration rate 20.00 in/hr
SHWT elevation varies(>70"deep;fmsl APR 19 MO
Trench Design Parameters
Drawdown time 0.01 days OK $Y;
Perforated pipe diameter 8.00 in
Perforated pipe length 6.00 ft
Number of laterals 2
Stone type(if used) No.57 washed
Stone void ratio 40
Stone is free of fines? Y (Y or N) OK
Form SW401-Infiltration Trench-Rev.4 Parts I.&II.Design Summary,Page 1 of 2

Permit No.
(to be provided by DWQ)
Trench Elevations
Bottom elevation (varies) fmsl #VALUE!
Storage/overflow elevation 32"above bottom fmsl
Top elevation 20"above bottom fmsl
Trench Dimensions
Length(long dimension) 16.00 ft
Width(short dimension) 6 00 ft
Height(depth) 1.67 ft OK
Additional Information
Maximum volume to each inlet into the trench? 0.02 ac-in OK
Length of vegetative filter for overflow (n/a) ft OK
Number of observation wells 1 OK
Distance to structure 25 00 ft OK
Distance from surface waters >150 ft OK
Distance from water supply well(s) >200 ft OK
Separation from impervious soil layer (n/a) ft OK
Depth of naturally occuring soil above SHWT >3 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
Trench wrapped with geotextile fabric? Y (Y or N) OK
Pretreatment device provided Y
Form SW401-Infiltration Trench-Rev.4 Parts I. &II.Design Summary,Page 2 of 2

--"dy
Permit NO�v`)f 9I&
(to be provided by DWQ)
�,,f 4 *q
W0
NCDENR STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATION APPLICATION FORM
INFILTRATION TRENCH SUPPLEMENT
This form must be filled out,printed and submitted.
The Required Items Checklist(Part Ill)must be printed,filled out and submitted along with all of the required information.
I. PROJECT INFORMATION
Project name Ocean Isle Beach 3rd&4th Street Extension
Contact person Donald M.Covil,P E.
Phone number [phone]
Date 4/16/2010
Drainage area number 2&3 (Cummulative rock trench systems for future driveways on each of 78 lots,)
II. DESIGN INFORMATION
Site Characteristics
Drainage area 41490:00 ft2
Impervious area 41,490.00 ft2
Percent impervious 100.0% %
Design rainfall depth 1.50 in
Peak Flow Calculations
1-yr,24-hr rainfall depth 3.73 in
1-yr,24-hr intensity 0,16 in/hr
Pre-development 1-yr,24-hr discharge 0.00 ft3/sec
Post-development 1-yr,24-hr discharge 0.00 ft3/sec
Pre/Post 1-yr,24-hr peak flow control 0.00 ft3/sec
Storage Volume:Non-SA Waters
Minimum volume required ft3
Volume provided • ft3
Storage Volume:SA Waters
1.5"runoff volume 5186 00 ft3
Pre-development 1-yr,24-hr runoff volume 0.00 ftf3 C�I's q D
Post-development 1-yr,24-hr runoff volume 0.00
Minimum volume required 5186.00 ft3 APR 19 2010
Volume provided 5,655.00 ft3 OK
Soils Report Summary
Soil type sand BY'
Infiltration rate 20.00 in/hr
SHWT elevation varies(>70"deep;fmsl
Trench Design Parameters
Drawdown time 0.01 days OK
Perforated pipe diameter 8 00 in
Perforated pipe length 6.00 ft
Number of laterals 156
Stone type(if used) No.57 washed
Stone void ratio 40
Stone is free of fines? Y (Y or N) OK
Form SW401-Infiltration Trench-Rev.4 Parts I.&II.Design Summary,Page 1 of 2

Permit No.
(to be provided by DWQ)
Trench Elevations
Bottom elevation (vanes) fmsl #VALUE!
Storage/overflow elevation 32"above bottom fmsl
Top elevation 20"above bottom fmsl
Trench Dimensions
Length(long dimension) 1,248.00 ft
Width(short dimension) 6 00 ft
Height(depth) 1.67 ft OK
Additional Information
Maximum volume to each inlet into the trench? 0.02 ac-in OK
Length of vegetative filter for overflow (n/a) ft OK
Number of observation wells 1 OK
Distance to structure 25.00 ft OK
Distance from surface waters >150 ft OK
Distance from water supply well(s) >200 ft OK
Separation from impervious soil layer (n/a) ft OK
Depth of naturally occuring soil above SHWT >3 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) 0K
Trench wrapped with geotextile fabric? Y (Y or N) OK
Pretreatment device provided Y
Form SW401-Infiltration Trench-Rev.4 Parts I.&II.Design Summary,Page 2 of 2

Permit No.
(to be provided by DWQ)
W. 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.
`Zi zw . /24,N.Set- 1. Plans(1"-50'or larger)of the entire site showing:
-Design at ultimate build-out, RECEIVES
D.
-Off-site drainage(if applicable),
-Delineated drainage basins(include Rational C coefficient per basin), MAR 2 2 2010
-Basin dimensions,
-Pretreatment system, v..
-High flow bypass system,
-Maintenance access,
-Proposed drainage easement and public right of way(ROW),
-Overflow device,and
-Boundaries of drainage easement.
CC.--Si. C—7 2.Partial plan(1"=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 filter,and
C)--Aft„.....-
C4 ,. -Pretreatment device.
.C'7 3. Section view of the infiltration basin(I"=20'or larger)showing:
-Pretreatment and treatment areas,and
10- L-•( _ -Inlet and outlet structures.
C..t IC s . 4. A table of elevations,areas,incremental volumes&accumulated volumes to verify the volume provided.
Qeic,. �%41- 5. A soils report that is based upon an actual field investigation,soil borings,and infiltration tests. The
°Yi5 4-41 results of the soils report must be verified in the field by DWQ,by completing&submitting the soils
)"J"`-) investigation request form. County soil maps are not an acceptable source of soils information.
kiite„ ,,C44, C-? 6. A construction sequence that shows how the infitiration basin will be protected from sediment until the
entire drainage area is stabilized.
01A,� ✓ 7. The supporting calculations.
C7f.te._ a/ 8. A copy of the signed and notarized operation and maintenance(O&M)agreement.
0-i ) 9. A copy of the deed restrictions(if required).
CSe e. S'fi r,,.,a 4.4- 1\14 -w
Form SW401-Infiltration Basin-Rev.4 Page 1 of 1 Part III.Required Items Checklist,Page 1 of 1

State Stormwater Management Systems
Permit No. SW8 980504MOD
° Ocean Isle Beach 3`d &4th Street Extension
Stormwater Permit No. SW8 980504MOD L
Brunswick County
Y
1111
Desi ner's Certification
I, AdAwoc, A., 4B rid , as a duly registered (A/4/N in the
State of North Carolina, having been authorized to observe (periodically/weekly/full
time) the construction of the project,
®CFily lsce- Awe" 3"' t 41' .fr r' F.i rrvsioN
(Project)
for 7004e of Bch rcLFBafcli (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 p 2 S8S6 "4444,e
Date //—/z _io •0268116
00000000
Page 7of8

State Stormwater Management Systems
Permit No. SW8 980504MOD
Certification Requirements:
7$40/1. 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.
/1y11 4. All roof drains are located such that the runoff is directed into the system.
,v/ 5. The outlet/ bypass structure weir elevation is per the approved plan.
,ir/ 6. The outlet/bypass structure is located per the approved plans. •
A// 7. A Trash Rack is provided on the outlet/bypass structure.
8. All slopes are grassed with permanent vegetation.
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.
04.'12. All required design depths are provided.
13. All required parts of the system are provided.
wes4/14. The required system dimensions are provided per the approved plans.
v"15. All components of the stormwater BMP are located in either recorded
common areas or recorded easements.
cc: NCDENR-DWQ Regional Office
Brunswick County Building Inspections
N0V192010
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