SW8060742_CURRENT PERMIT_20061024

STORMWATER DIVISION CODING SHEET
POST -CONSTRUCTION PERMITS
PERMIT NO.
SW
j`%U7��
DOC TYPE
CURRENT PERMIT
APPROVED PLANS
❑ HISTORICAL FILE
❑ COMPLIANCE EVALUATION INSPECTION
DOC DATE
�1J77L0/(�a�
YYYYMMDD

Nlichael P. Faslcti, Governor
William G. doss Jr., secretary
North Carolina Dcpartmcnt o1 13nvironment and Natural Rcsourccs
Alan W, Klimck, 11 E, Director
Division ol'Walcr Quality
October 24, 2006
Brian K. Keesee, President
Brian Keith Keesee Construction, Inc.
8300 E. Oak Island Drive
Oak Island, NC 28465
Subject: Stormwater Permit No. SW8 060742
Oak Island Building Supply
High Density Project
Brunswick County
Dear Mr. Keesee:
The Wilmington Regional Office received a complete Stormwater Management Permit
Application for Oak Island Building Supply on September 20, 2006. 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 060742 dated October 24, 2006, for the construction of the subject project.
This permit shall be effective from the date of issuance until October 24, 2016, 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 sixty (60) days
following receipt of this permit. This request must be in the form of a written petition,
conforming to Chapter 150E 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 Linda Lewis, or me at [phone].
Sincerely
4 4
CO3
�
Edward Beck
Regional Supervisor
Surface Water Protection Section
ENBlarl: S:IWQSISTORMWATIPERMIT1060742.oct06
cc: J. W. Huggins, P.E.
Town of Oak Island Building Inspections
Linda Lewis
Wilmington Regional Office
Central Files
01"
Nbrlhcurolina
,lValiaally
North Carolina Division o#'Water Quality 127 C;odinnI Diivo I tension Wilmington, W 2840'1 Phone [phone] C:ostornCr,Scrvicc
Wiln)ington Regiorfal OtTiice Internet: www.ncwalertltmhtv.org Fax [phone]
An Equal OpportunitylAMrmative Action Employer — 50°1 Recycledl10% Post Consumer Paper

State Stormwater Management Systems
Permit No. SW8 060742
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES
DIVISION OF WATER QUALITY
STATE STORMWATER MANAGEMENT PERMIT
HIGH DENSITY DEVELOPMENT
In accordance with the provisions of Article 21 of Chapter 143, General Statutes of North
Carolina as amended, and other applicable Laws, Rules, and Regulations
PERMISSION IS HEREBY GRANTED TO
Brian K. Keesee & Brian Keith Keesee Construction, Inc.
Oak Island Building Supply
4255 Long Beach Road, Southport, Brunswick County
FOR THE
construction, operation and maintenance of two underground infiltration trench systems 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 October 24, 2016, 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 on page 3 of this permit. The stormwater controls
fer Drainage Areas 01 and 02 have been designed to handle the runoff from 76,000
ft and 14,051 ft of impervious area, respectively.
3. The design storm for each system is 3 inches therefore a vegetated filter is not
required. Runoff in excess of the design storm is intended to bypass through the top
of the catch basins and flood the parking areas until it can infiltrate.
4. The tract will be limited to the amount of built -upon area indicated on page 3 of this
permit, and per approved plans.
5. 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.
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.
Page 2 of 7

State Stormwater Management Systems
Permit No. SW8 060742
7. The following design criteria have been provided in the infiltration trench and must be
maintained at design condition:
DA 01
DA 02
a.
Drainage Area, acres:
1.74
0.55
Onsite, ft2:
76,000
24,000
Offsite, ft2:
0
0
b.
Total Impervious Surfaces, ft2:
76,000
14,051
C.
Design Storm, inches:
3
3
d.
Trench Dimensions, L x W x H, ft:
334.5x25.25x4
156.5x11x4
e.
Perforated Pipe Diameter/Length:
n/a
nla
f,
Bottom Elevation, FMSL:
16.5
16.5
g.
Bypass Weir Elevation, FMSL:
21.5
21.5
h.
Permitted Storage Volume, ft :
19,176
3,590
i.
Type of Soil:
Med. to Fine Sand (both)
j.
Expected Infiltration Rate, in/hr:
14.8
14.8
k.
Seasonal High Water Table, FMSL:
14.5
14.5
I.
Time to Draw Down, hours:
12
5
m.
Receiving Stream/River Basin:
Calf Gully Creek / Cape
Fear
n.
Stream Index Number:
CPF17 18-88-9-3-3-1
o.
Classification of Water Body:
"SC Sw HQW"
II. SCHEDULE OF COMPLIANCE
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, filter media, flow
spreader, catch basins, piping and vegetated filter.
g. A clear access path to the bypass structures must be available at all times.
4. Records of maintenance activities must be kept and made available upon request to
authorized personnel of DWQ. The records will indicate the date, activity, name of
person performing the work and what actions were taken.
5. The facilities shall be constructed as shown on the approved plans. This permit shall
become voidable unless the facilities are constructed in accordance with the
conditions of this permit, the approved plans and specifications, and other supporting
data.
6. 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.
Page 3 of 7

State Stormwater Management Systems
Permit No. SW8 060742
7. 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.
8. Access to the stormwater facilities shall be maintained via appropriate easements at
all times.
9. The permittee shall submit to the Director and shall have received approval for
revised plans, specifications, and calculations prior to construction, for any
modification to the approved plans, including, but not limited to, those listed below..
a. Any revision to any item shown on the approved plans, including the
stormwater management measures, built -upon area, details, etc.
b. Project name change.
C. Transfer of ownership.
d. Redesign or addition to the approved amount of built -upon area or to the
drainage area.
e. Further subdivision, acquisition, lease or sale of all or part of the project area.
The project area is defined as all property owned by the permittee, for which
Sedimentation and Erosion Control Plan approval or a CAMA Major permit
was sought.
f. Filling in, altering, or piping of any vegetative conveyance shown on the
approved plan.
10. The permittee shall submit final site layout and grading plans for any permitted future
areas shown on the approved plans, prior to construction.
11. A copy of the approved plans and specifications shall be maintained on file by the
Permittee for a minimum of ten years from the date of the completion of 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
This permit is not transferable except after notice to and approval by the Director. In
the event of a change of ownership, or a name change, the permittee must submit a
formal permit transfer request to the Division of Water Quality, accompanied by a
completed name/ownership change form, documentation from the parties involved,
and other supporting materials as may be appropriate. The approval of this request
will be considered on its merits and may or may not be approved. The permittee is
responsible for compliance with all permit conditions until such time as the Division
approves the transfer request.
2, Failure to abide by the conditions and limitations contained in this permit may subject
the Permittee to enforcement action by the Division of Water Quality, in accordance
with North Carolina General Statute 143-215.6A to 143-215.6C.
3. 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.
Page 4 of 7

State Stormwater Management Systems
Permit No. SW8 060742
4. In the event that the facilities fail to perform satisfactorily, including the creation of
nuisance conditions, the Permittee shall take immediate corrective action, including
those as may be required by this Division, such as the construction of additional or
replacement stormwater management systems.
5. The permittee grants DENR Staff permission to enter the property during normal
business hours for the purpose of inspecting all components of the permitted
stormwater management facility.
6. The permit may be modified, revoked and reissued or terminated for cause. The
filing of a request for a permit modification, revocation and reissuance or termination
does not stay any permit condition.
7. Unless specified elsewhere, permanent seeding requirements for the stormwater
control must follow the guidelines established in the North Carolina Erosion and
Sediment Control Planning and Design Manual.
8. Approved plans and specifications for this project are incorporated by reference and
are enforceable parts of the permit.
9. The permittee shall notify the Division any name, ownership or mailing address
changes within 30 days.
Permit issued this the 24th day of October 2006.
NORTH CAROLINA ENVIRONMENTAL MANAGEMENT COMMISSION
)r Aian W. Klimek, P.E., Director
Division of Water Quality
By Authority of the Environmental Management Commission
Page 5 of 7

State Stormwater Management Systems
Permit No, SW8 060742
Oak Island Building Supply
Stormwater Permit No. SW8 060742
Brunswick Count
Designer's Certification
I, , as a duly registered in the
State of North Carolina, having been authorized to observe (periodically/ weekly/ full time)
the construction of the project,
(Project)
for (Project Owner) hereby state that, to the best
of my abilities, due care and diligence was used in the observation of the project
construction such that the construction was observed to be built within substantial
compliance and intent of the approved plans and specifications.
The checklist of items on page 2 of this form is included in the Certification.
Noted deviations from approved plans and specification:
Signature
Registration Number
Date
SEAL
Page 6 of 7

State Stormwater Management Systems
Permit No. S1N8 060742
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 elevations are per the approved plan.
6. The bypass structure is located per the approved plans.
7. A Trash Rack is provided on the outlet/bypass structure.
8. All slopes are grassed with permanent vegetation.
9. Vegetated slopes are no steeper than 3:1.
10. The inlets are located per the approved plans and do not cause short-
circuiting of the system.
11. The permitted amounts of surface area and/or volume have been provided.
12. All required design depths are provided.
13. All required parts of the system are provided.
14. The required system dimensions are provided per the approved plans.
CC NCDENR-DWQ Regional Office
Town of Oak Island Building Inspections
Page 7 of 7

:. ,.,.. , : ' '' , , :" ,'..OFFICE'USE ONLY;.
Date Received
Fee Paid
Permit Number
�-00- 2 00(9
�*40:aCoW Wloco
--YyJCW-740
State of North Carolina
Department of Environment and Natural Resources
Division of Water Quality
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
This form may be photocopied for use as an original
I. GENERAL INFORMATION
1. Applicants name (specify the name of the corporation, individual, etc. who owns the project):
h --,e.r, Ke.:-k-\ j1e-e-,Sec-- Gon 6+r-ur11'l:n L . --
2, Print Owner/Signing Official's name and title (person legally lresponsible for facility and compliance):
-. k Ke-,41e,e.5e.e— , P r-C3 d Qn i'
3. Mailing Address for person listed in item 2 above:
S 3Oa J_.- O(Xk T S l ter, h pr .
City: Oa k, I i! M A State: JJ L Zip: 2 S US
Telephone Number: ( q 10 ) 1 - $9 - -
4. Project Name (subdivision, facility, or establishment name - should be consistent with project name on plans,
specifications, letters, operation and maintenance agreements, etc.):
5. Location of Project (street address):
(+I. �;S 1ro.:T o)e-o.cL. k2
City: Sou u I 17 County: Gr-u^ Sw: L 1`
6. Directions to project (from nearest major intersection):
'Fr Ov , b+ Jy 1-1-3 I 1y L
7. Latitude: 3 S* 5 6 3.5'L Longitude: 7 so 313 6, s S,1 W of project
8. Contact person who can answer questions about the project:
Name: f o�/� Ke + -� S� �- Telephone Number:
II. PERMIT INFORMATION: ��//
1. Specify whether project is (check one): X New
Form SWU-101 Version 3.99 Page 1 of
Renewal Modification

2. If this application is being submitt d as a result of a renewal or modification to an existing permit, 'st the
existing permit number and its issue date (if known)
3. Specify the type of project (check one):
Low Density High Density Redevelop General Permit Other
4. Additional Project Requirements (check applicable blanks):
_CAMA Major Sedimentation/Erosion Control _404/401 Permit X-NPDES Stormwater
Information on required state permits can be obtained by contacting the Customer Service Center at
1-877-623-6748.
M. 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.
2. Stormwater runoff from this project drains to the �.e� n �/�� River basin.
3. Total Project Area: 01 acres
4. Project Built Upon Area:_- ID T�%
5. How many drainage areas does the project have?--qt,_
6. 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.
Basin Information
Drainage,Afea 1
Drainage Area 2
Receiving Stream Name
Ca , G e-r-e-e
Z'� G V t iL
Receiving Stream CIass
SL ' W ' !� W
S L W '
Drainage Area
oo ca f V---&
0 V Q5
Existing Impervious` Area
fit
Proposed Impervious*Area
% Impervious" Area (total)
00 O
Impervious` Surface Area
Drainage Area I
Drainage Area 2
On -site Buildings
ZOOO
On -site Streets
OOa
On -site Parking
On -site Sidewalks
Other on -site
Off -site
�!
Total--* OOd S p�­r-
Total: 14 a S t
Impervious area is defined as the built upon area include g, but not limited to, buildings, roads, parki g areas,
sidewalks, gravel areas, etc.
Form SWU-101 Version 3.99
Page 2 of 4

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7. How was the off -site impervious area listed above
IV. DEED RESTRICTIONS AND PROTECTIVE COVENANTS
The following italicized deed restrictions and protective covenants are required to be recorded for all
subdivisions, outparcels and future development prior to the sale of any lot. If lot sizes vary significantly, a table
listing each lot number, size and the allowable built -upon area for each Iot must be provided as an attachment.
1. The following covenants are intended to ensure ongoing compliance with state stormwater management permit number
as issued by the Division of Water Quality. These covenants may not be
changed or deleted without the consent of the State.
2. No more than square feet of any lot shall be covered by structures or impervious materials.
Impervious materials include asphalt, gravel, concrete, brick, stone, slate or similar material but do not include wood
decking or the water surface of swimming pools.
3 Swales shall not be filled in, piped, or altered except as necessary to provide driveway crossings.
4. Built -upon area in excess of the permitted amount requires a state stormwater management permit modification prior to
construction.
5. All permitted runoff from outparcels or future development shall be directed Into the permitted stormwater control
system. These connections to the stormwater control system shall be performed in a manner that maintains the integrity
and performance of the system as permitted.
By your signature below, you certify that the recorded deed restrictions and protective covenants for this project
shall include all the applicable items required above, that the covenants will be binding on all parties and persons
claiming under them, that they will run with the land, that the required covenants cannot be changed or deleted
without concurrence from the State, and that they will be recorded prior to the sale of any lot.
V. SUPPLEMENT FORMS
The applicable state stormwater management permit supplement form(s) Iisted below must be submitted for each
BMP specified for this project. Contact the Stormwater and General Permits Unit at [phone] for the status
and availability of these forms.
Form SWU-102
Wet Detention Basin Supplement
Form SWU-I03
Infiltration Basin Supplement
Form SWU-104
Low Density Supplement
Form SWU-105
Curb Outlet System Supplement
Form SWU-106
Off -Site System Supplement
Form SWU-107
Underground Infiltration Trench Supplement
Form SWU-108
Neuse River Basin Supplement
Form SWU-109
Innovative Best Management Practice Supplement
Farm SWU-101 Version 3.99
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 Regional Office.
1. Please indicate that you have provided the following required information by initialing in the space provided
next to each item.
itials
• Original and one copy of the Stormwater Management Permit Application Form
• One copy of the applicable Supplement Form(s) for each BMP
• Permit application processing fee of $420 (payable to NCDENR)
• Detailed narrative description of stormwater treatment/management
• Two copies of plans and specifications, including: AA
Development/Project name
Engineer and firm
-Legend
North arrow
Scale
Revision number & date
Mean high water line
- Dimensioned property/project boundary
- Location map with named streets or NCSR numbers
- Original contours, proposed contours, spot elevations, finished floor elevations
Details of roads, drainage features, collection systems, and stormwater control measures
Wetlands delineated, or a note on plans that none exist
Existing drainage (including off -site), drainage easements, pipe sizes, runoff calculations
Drainage areas delineated
Vegetated buffers (where required)
VII. AGENT AUTHORIZATION
-If you wish to designate authority to another individual or firm so that they may provide information on your
behalf, please complete this section.
Designated agent (individual or firm): W
Mailing Address: `35 `1 L
City: 66IJ+%-, Llt)--�-----
Phone: ( q 10 ) Z 4-go
VIII. APPLICANT'S CERTIFICATION
SvrV�`t '�a 71L.
State: 0 L Zip: '2$q b 1
Fax: ( 'Ob6 ) 59 4- — 4'i %.a
1, (print or type name of person listed in General Information, item 2) �f`'� key Kee 5�� , Ores'
certify that the information included on this permit application form is, to the best of my knowledge, tort t and
nd
that the project will be constructed in conformance with the approved plans, that the required deed restrictions
and protective covenants will be recorded, and that the proposed project complies with the requirements of 15A
NCAC 2H .100 .
MI
Signature: Date:
Pr" ker+
Form SWU-101 Version 3.99 Page 4 of 4

Permit No. SW L 0C00-7-42-
(to be provided by DWQ)
State of North Carolina
Department of Environment and Natural Resources
Division of Water Quality .
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
UNDERGROUND INFILTRATION TRENCH SUPPLEMENT
This form may be photocopied for use as an original
DWO Stormwater Management Plan Review:
A complete stormwater management plan submittal includes a stormwater management permit application, an
underground infiltration trench supplement for each system, design calculations, and plans and specifications
showing all stormwater conveyances and system details.
I. PROJECT INFORMATION
Project Name : V Pr1` .1•- S_I d _Q V . 14ifb
Contact Person: b r : kf-e- 5 -e, e_ Phone
For projects with multiple infiltration systems, a supplement form must be completed for each system. This
worksheet applies to: Trench in Drainage 1. ge Area 01 CO' Io-2 (from plans) (from Form SWU 101)
II. DESIGN INFORMATION (attach supporting calculationstdocumentation):
Soils Report Summary (based upon an actual field investigation and soil borings)
Soil Type k4L �;y 0 r"N e— Sa--cl
Infiltration Rate _ �'• �, a or cf/hrlsf (circle appropriate units)
SHWT Elevation _ 4. 5� _ fmsl (Seasonal High Water Table elevation)
Trench Design Parameters
Design Volume j q =2 c f 3b� 5 40,b. , S Q''ov ; Ae—A
Design Storm 4rS } inch event (1.5 inch event or SA waters, I inch event for others)
Drawdown Time days
Perforated Pipe Size S4L- +'+V inch diameter
S Tor-.V,1i4L41_-'
Perforated Pipe Length
No. Observation Wells (may be required on a case -by -case basis)
Stone Type (if used)' J UGC
(4o %u
Stone Void Ratio
Trench Elevations (in feet mean sea level)
Bottom Elevation 116. fmsl
Storage/Overflow Elevation - m • S fmsl
MCD b� P055 iS re�UI'r-e _'4� 9-7-G[o
Form SWU-107 Rev 3.99 Page 1 of 4

Trench Dimensions
Height ft.
Width ' '5 .S ft.
Zj NQ O� zs fa -ow- hp of? -Ae
III. REQUIRED ITEMS CHECKLIST
Length
Volume Provided
Sk:5rrn f ech Ch am %&-,
The following checklist outlines design requirements per the Stormwater Best Management Practices manual (N.C.
Department of Environment, Health and Natural Resources, November 1995) and Administrative Code Section: 15
A NCAC 2H .1008.
Initial in the space provided to indicate that the following design requirements have been met and supporting
documentation is attached. if the applicant has designated an agent in the Stormwater Management Permit
Application Form, the agent may initial below. Attach justification if a requirement has not been met.
a. System is located 50 feet from class SA waters and 30 feet from other surface waters.
b. System is located at least 100 feet from water supply wells.
c. Bottom of system is at least 2 feet above the seasonal high water table.
d. Bottom of the system is 3 feet above any bedrock or impervious soil horizon.
e. Off-line system, runoff in excess of the design volume bypasses the system (bypass detail
provided). A 3" desi y'? shy -m /' S used.
Rvp . £ System is designed to draw down the design storage volume to the proposed bottom
elevation under seasonal high water conditions within five days based upon infiltration
through the bottom only (a hydrogeologic evaluation may be required).
g. Soils have a minimum hydraulic conductivity of 0.52 inches per hour.
h. System is not sited on or in fill material or DWQ approval has been obtained.
i. Plans ensure that the installed system will meet design specifications (constructed or
restored) upon initial operation once the project is complete and the entire drainage area is
stabilized.
Ark j. System is sized to take into account the runoff at the ultimate built -out potential from all
surfaces draining to the system, including any off -site drainage.
k. System is located in a recorded drainage easement for the purposes of operation and
1 maintenance and has recorded access easements to the nearest public right-of-way.
Pe 1. System captures and infiltrates the runoff from the first 1.0 inch of rainfall (1.5 inch event
for areas draining to SA waters ).
m. Drainage area for the device is less than 5 acres.
n. A pretreatment device ( filter strip, grassed swale, sediment trap, etc.) is provided.
o. Trench bottom is covered with a layer of clean sand to an average depth of 4 inches.
Ap. Sides of the infiltration trench are lined with geotextiie fabric.
JA: q. Rock used is free of fines (washed stone) and has a large void ratio.
kkr. Side to bottom area ratio is less than 4.1.
Form SWU-107 Rev 3.99 Page 2 of 4

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s. Observation well(s) are provided (case -by -case basis).
44 t. Vegetated filter is provided for overflow (50 feet for SA waters, 30 feet for other waters)
and detail is shown on plans.
u. A benchmark for checking sediment accumulation is provided.
IV. UNDERGROUND INFILTRATION TRENCH OPERATION AND MAINTENANCE AGREEMENT
I . After every runoff producing rainfall event and at least monthly inspect the bypass/overflow structure for
blockage and deterioration and the infiltration system for erosion, trash accumulation, grass cover, and general
condition.
2. Repair eroded areas immediately, re -seed as necessary to maintain adequate vegetative cover, mow vegetative
cover to maintain a maximum height of six inches, and remove trash and blockages as needed to maintain
system performance.
3. Remove accumulated sediment annually or when depth is reduced to 75% of the original design depth. Restore
depth to original design depth without over -excavating. Over -excavating may cause the required water table
separation to be reduced and may compromise the ability of the system to perform as designed
4. The water level in any monitoring wells will be recorded after a I inch rainfall event and at least once a month.
Chronic high water table elevations (within l foot of the bottom of the system for a period of three months)
shall be reported to DWQ immediately.
5. If DWQ determines that the system is failing, the system will immediately be repaired or replaced to original
design specifications. If the system cannot be repaired to perform its design function, other stormwater control
devices as allowed by NCAC 2H .1000 must be designed, approved and constructed.
5. Remove accumulated sediment from the infiltration system annually or when depth in the unit is reduced to
75% of the original design depth. The system shall be restored to the original design depth without over -
excavating. Over -excavating may cause the required water table separation to be reduced and may
compromise the ability of the system to perform as designed. Removed sediment shall be disposed of in an
appropriate manner and shall not be handled in a manner that will adversely impact water quality (i.e.
stockpiling near a stormwater treatment device or stream, etc.).
.A benchmark shall be established in the infiltration system. The benchmark will document the original
design depth so that accurate sediment accumulation readings can be taken. The measuring device used to
determine the depth at the benchmark shall be such that it will give an accurate depth reading and not
readily penetrate into accumulated sediments. A
When the depth at the benchmark reads i,?, (PZ 7 , the accumulated sediment shall be removed
from the system.
n`'(Z=Z�Jr
2, -::- 1,975
2, S I, FIS = . (�zs
Form SWU-107 Rev 3.99 Page 3 of 4

s
l: •i v i:7rh..Y. � !a. � o a n' 4 .l7 �A `5' • '�.
• f�.l, � r•�
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i• ter.. .�'' 1•.
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I acknowledge and agree by my signature below that I am responsible for maintaining the stormwater
collection system in accordance with the six 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.
Print Name and Title: 6 r-;O'� ke_, yn' IBC i —5e-e--
address: $ 30a t D-� It, -1 S )ova I_ , Dr.
Phone
Signatt
Note: The legally re.cpernsihle party shnxdd not be a homeowners association unless more Phan 50% of the lots have been sold and a
resident of the subdivision has been named fhe president,
6A1 ej a Notary Public for the State of ( p , County of
do hereby certify lhal[yg.. _ S personally appeared before me this
day of 26er , �otQ p Q , and acknowledge the due execution of the forgoing infiltration basin maintenance
requirements. Witness my hand and official seal,
OI�IClAL S�1tL
PATRICIA 0. GABBARD
3i NOTARY PUSUC: - NOR1H CAROLINA
BRUNSWICK COUNTY
_ E]tPtRE.S
_ O Gk'
SEAL My commission expires — l0- o%
Form SWU-107 Rev 3.99 Page 4 of 4

Permit No. St(J e 0(00 -4 2
(to be provided by DWQ)
State of North Carolina
Department of Environment and Natural Resources
Division of Water Quality
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
UNDERGROUND INFILTRATION TRENCH SUPPLEMENT
This form maybe photocopied for use as an original
DWQ Stormwater Management Plan Review:
A complete stormwater management plan submittal includes a stormwater management permit application, an
underground infiltration trench supplement for each system, design calculations, and plans and specifications
showing all stormwater conveyances and system details.
I. PROJECT INFORMATION
Project Name : VA _4-A let A nV • 1a .-
Contact Person: d r a k
v
Number-. (q101
For projects with multiple infiltration systems, a supplement form must be completed for each system. This
worksheet applies to: Trench in Drainage Areaol'jp.j L� i0l'sq -0,
(from plans) (from Form SWU-101)
11. DESIGN INFORMATION (attach supporting calculations/documentation):
Soils Report Summary (based upon an actual field investigation and soil borings)
Soil Type M e-a-. u -v\ 4-0 P^ e— SoN d,
Infiltration Rate 14.2 0� or cfThr/sf (circle appropriate units)
SHWT Elevation 1 4 • s' f nsl (Seasonal High Water Table elevation)
Trench Design Parameters
Design Volume
Design Storm
Drawdown Time
Perforated Pipe Size
Perforated Pipe Length
No. Observation Wells
Stone Type (if used)
Stone Void Ratio
3 inch event (1.5 inch event for SA waters, 1 inch event for others)
!� days
5 L-� (+ in Ch� dlame eI 5 TV r'�'1
44 0..;46
`i (may be required on a case -by -case basis)
An
lo
Trench Elevations (in feet mean sea level)
Bottom Elevation b •5 f nsl
Storage/Overflow Elevation fmsl .21` 5 Igo- ' G(o
tia bq pes5
Form SWU-107 Rev 3.99 Page I of 4

Trench Dimensions
Height
Width
b H�1�hF 2s
p�
1
4 ft.
ft.
me-lsurec k) +kz fvp of
M. REQUIRED ITEMS CHECKLIST
tl
1
Length
Volume Provided 35°I17 cu.ft.
f� e Sa m tech 0jambJ; -
The following checklist outlines design requirements per the Stormwater Best Management Practices manual (N.C.
Department of Environment, Health and Natural Resources, November 1995) and Administrative Code Section: 15
A NCAC 2H .1008.
Initial in the space provided to indicate that the following design requirements have been met and supporting
documentation is attached. If the applicant has designated an agent in the Stormwater Management Permit
Application Form, the agent may initial below. Attach justification if a requirement has not been met.
ats Initials
a. System is located 50 feet from class SA waters and 30 feet from other surface waters.
b. System is located at least 100 feet from water supply wells.
c. Bottom of system is at least 2 feet above the seasonal high water table.
d. Bottom of the system is 3 feet above any bedrock or impervious soil horizon.
e
Iv- -0—
,2— f.
Off-line system, runoff in excess of the design volume bypasses the system (bypass detail
provided). desr9,7 sh>-tn s used.
System is designed to draw down the design storage volume to the proposed bottom
elevation under seasonal high water conditions within five days based upon infiltration
through the bottom only (a hydrogeologic evaluation may be required).
g. Soils have a minimum hydraulic conductivity of 0.52 inches per hour.
h. System is not sited on or in fill material or DWQ approval has been obtained.
Plans ensure that the installed system will meet design specifications (constructed or
restored) upon initial operation once the project is complete and the entire drainage area is
stabilized.
j. System is sized to take into account the runoff at the ultimate built -out potential from all
surfaces draining to the system, including any off -site drainage_
k. System is located in a recorded drainage easement for the purposes of operation and
J� maintenance and has recorded access easements to the nearest public right-of-way.
f� 1. System captures and infiltrates the runoff from the first 1.0 inch of rainfall (1.5 inch event
for areas draining to SA waters ).
m. Drainage area for the device is less than 5 acres.
n. A pretreatment device ( filter strip, grassed swale, sediment trap, etc.) is provided.
o. Trench bottom is covered with a Iayer of clean sand to an average depth of 4 inches.
p. Sides of the infiltration trench are lined with geotextile fabric.
q. Rock used is free of fines (washed stone) and has a large void ratio.
r. Side to bottom area ratio is less than 4:1.
Form SWU-107 Rev 3.99 Page 2 of 4

As. Observation well(s) arc provided (case -by -case basis).
t. Vegetated filter is provided for overflow (50 feet for SA waters, 30 feet for other waters)
and detail is shown on lans
P
u. A benchmark for checking sediment accumulation is provided.
IV. UNDERGROUND INFILTRATION TRENCII OPERATION AND MAINTENANCE AGREEMENT
After every runoff producing rainfall event and at least monthly inspect the bypass/overflow structure for
blockage and deterioration and the infiltration system for erosion, trash accumulation, grass cover, and general
condition.
2. Repair eroded areas immediately, re -seed as necessary to maintain adequate vegetative cover, mow vegetative
cover to maintain a maximum height of six inches, and remove trash and blockages as needed to maintain
system performance.
3. Remove accumulated sediment annually or when depth is reduced to 75% of the original design depth. Restore
depth to original design depth without over -excavating. Over -excavating may cause the required water table
separation to be reduced and may compromise the ability of the system to perform as designed.
4. The water level in any monitoring wells will be recorded after a I inch rainfall event and at least once a month.
Chronic high water table elevations (within 1 foot of the bottom of the system for a period of three months)
shall be reported to DWQ immediately.
5. If DWQ determines that the system is failing, the system will immediately be repaired or replaced to original
design specifications. If the system cannot be repaired to perform its design function, other stormwater control
devices as allowed by NCAC 2H .1000 must be designed, approved and constructed.
6. Remove accumulated sediment from the infiltration system annually or when depth in the unit is reduced to
75% of the original design depth. The system shall be restored to the original design depth without over -
excavating. Over -excavating may cause the required water table separation to be reduced and may
compromise the ability of the system to perform as designed. Removed sediment shall be disposed of in an
appropriate manner and shall not be handled in a manner that will adversely impact water quality (i.e.
stockpiling near a stormwater treatment device or stream, etc.).
A benchmark shall be established in the infiltration system. The benchmark will document the original
design depth so that accurate sediment accumulation readings can be taken. The measuring device used to
determine the depth at the benchmark shall be such that it will give an accurate depth reading and not
readily penetrate into accumulated sediments. 1j
When the depth at the benchmark reads a 6225 , the accumulated sediment shall be removed
from the system,
Form SWU-107 Rev 3.99 Page 3 of 4

• i •7�C
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....i. t'1
w. , t .� .

I acknowledge and agree by my signature below that I ant responsible For maintaining the stormwater
collection system in accordance with the six maintenance procedures listed above. I agree to notify DWQ
of any proMems with the system or prior to any changes to the system or respnnsiblc party.
Print Name and 'ritle: Ke—; -V� ke— e-see— Iey-, �
Address: �3OD -I )an I Dr. _ --Z.__•I-
Phone
Signatt
Note: The 1pgally responsible party should not he a homeowners ossoc•iarirrrr rrrrlr!SS rrrorce !hair 50% of the lo1.r have been sold and a
resident of,111ce subdivision has been named the presidew,
a Notary Public for the State of �Q jV4C_p`ln� . County of
do hereby certify [hat _ ���; ��5�-� perscxtally appeared before me this yypp� ����
.._ ... _ C.t`1
clay of SWA& ,y and aeknowlcdge the eiue execution of the (brgoing intiltration basin mainlcnance
requirements. Witness my hand and official seal,
t]lICLAL SEA!
PATRICIA C. GABBARD
NOTARY PUBLIC - NORTH CAROLINA
.-.W°
BRUNSWICK OOUNTY
COMLNISSION
.
SFAI, My comrrtissiun expires—_10-(? — Q10O5
Form SWIJ-107 Rcv 3.49 Page 4 of 4