SW8030503_CURRENT PERMIT_20030623

STORMWATER DIVISION CODING SHEET
POST -CONSTRUCTION PERMITS
PERMIT NO.
SW Y/O ")�
DOC TYPE
CURRENT PERMIT
❑ APPROVED PLANS
❑ HISTORICAL FILE
❑ COMPLIANCE EVALUATION INSPECTION
DOC DATE
YYYYMMDD

r aoF w A rFR
o7
rJ 'C
Mr. Steve Niemeyer, Manager
Tricoast Properties, LLC
1508 Military Cutoff Road, Suite 302
Wilmington, NC 28403
Dear Mr. Niemeyer:
Michael F. Easley, Governor
Witliam G. Ross Jr., Secretary
North Carolina Department of Environment and Natural Resources
Alan W. Klimek, P.E-Director
Division of Water Quality
Coleen H. Sullins, Deputy Director
Division of Water Quality
June 23, 2003
Subject: Permit No. SW8 030503
Southport Commons
High Density Stormwater Project
Brunswick County
The Wilmington Regional Office received a complete Stormwater Management Permit
Application for Southport Commons on .tune 19, 2003. 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 030503
dated June 23, 2003, for the construction of Southport Commons.
This permit shall be effective from the date of issuance until June 23, 2013, 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
Laurie Munn, or me at [phone].
Sincerely,
Rick Shiver
Water Quality Regional Supervisor
RSS/Ism: S:1WQSISTORMWATIPERMIT1030503.june03
cc: John A. Kuske, III, P.E.
New Hanover County Building Inspections
Beth E. •Wetherill, New Hanover County Engineering
Laurie Munn
Wilmington Regional Office
Central Files
N. C. Division of Water Quality 127 Cardinal Drive Extension [phone] Customer Service AM..,�,.
Wilmington Regional Office Wilmington, NC 28405 [phone] Fax [phone] NCDEN:R

State Stormwater Management Systems
Permit No. SW8 030503
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
Tricoast Properties, LLC
Southport Commons
Brunswick County
FOR THE
construction, operation and maintenance of an underground infiltration trench system 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 June 23, 2013, and shall be subject
to the following specified conditions and limitations:
L DESIGN STANDARDS
l . 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 on page 3 of this permit, the Project Data Sheet. The stormwater control has
been designed to handle the runoff from 53,000 square feet of impervious area. The
trench system must be operated with a 30' vegetated filter.
3. The tract will be limited to the amount of built -upon area indicated on page 3 of this
permit, and per approved plans.
4. All stormwater collection and treatment systems must be located in either dedicated
common areas or recorded easements. The final plats for the project will be recorded
showing all such required easements, in accordance with the approved plans.
5. The runoff from all built -upon area within the permitted drainage area of this project must
be directed into the permitted stormwater control system. A permit modification must be
submitted and approved prior to the construction of additional built -upon area from
outside of the approved drainage area.
4

i
State Stormwater Management Systems
Permit No. SW 8 030503
DIVISION OF WATER QUALITY
PROJECT DESIGN
DATA SHEET
Project Name:
Southport Commons
Permit Dumber:
SW8 030503
Location:
Brunswick County
Applicant:
Mr. Steve Niemeyer
Mailing Address:
Tricoast Properties, LLC
1508 Military Cutoff Road, Suite 302
Wilmington, NC 28403
Application Date:
June 19, 2003
Receiving Stream/River Basin:
Price Creek / Cape Fear
Stream Index Number:
CPF17 18-88-3
Classification of Water Body:
"SC Sw"
Trench Dimensions, L x W x H, feet:
565 x 13 x 1.6
Bottom Elevation FMSL:
20.80
Drainage Area, acres:
Total Impervious Surfaces, ft2:
Offsite Area entering Pond, ft2:'
Required Storage Volume, ft3:
Provided Storage Volume, ft3:
Temporary Storage Elevation, FMSL:
Controlling Orifice:
Type of Soil:
Expected Infiltration Rate:
Seasonal High Water Table Elevation
Time to Drawdown:
1.61
53,000
none, per Engineer
4,267
5,533
22.20
bypass weir at overflow elevation pipe
Fine to Medium Sand
18 inches per hour
18.80 FMSL
0.43 hours
3

- -
State Storm,,vater Management Systems
Pen -nit No. SW8 030503
II. SCHEDULE OF COMPLIANCE
The stonmvater management system shall be constructed in its entirety, vegetated and
operational for its intended use prior to the construction of any built -upon surface.
During construction, erosion shall be kept to a minimum and any eroded areas of the
system will be repaired immediately.
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.
C. Maintenance of all slopes in accordance with approved plans and specifications.
f. Debris removal and unclogging of outlet structure, orifice device, flow spreader,
catch basins and piping.
g. Access to the outlet structure must be available at all times.
4. Records of maintenance activities must be kept and made available upon request to
authorized personnel of DWQ. The records will indicate the date, activity, name of
person performing the work and what actions were taken.
5. The facilities shall be constructed as shown on the approved plans. This permit shall
become voidable unless the facilities are constructed in accordance with the conditions of
this permit, the approved plans and specifications, and other supporting data.
6. Upon completion of construction, prior to issuance of a Certificate of Occupancy, and
prior to operation of this permitted facility, a certification must be received from an
appropriate designer for the system installed certifying that the permitted facility has been
installed in accordance with this permit, the approved plans and specifications, and other
supporting documentation. Any deviations from the approved plans and specifications
must be noted on the Certification. A modification may be required for those deviations.
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 w
occupancy of the facility. -
8. 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, 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.
£ Filling in, altering, or piping of any vegetative conveyance shown on the approved
plan.
4

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State Stormwater Management Systems
Permit No. SW8 030503
9. The permittee shall submit final site layout and grading plans for any permitted future
areas shown on the approved plans, prior to construction. If the proposed BUA exceeds
the amount permitted under this permit, a modification to the permit must be submitted
and approved prior to construction.
10. 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.
11. At least 30 days prior to the sale or lease of any portion of the properly, the permittee
shall notify DWQ and provide the name, mailing address and phone number of the
purchaser or leasee. An access/maintenance easement to the stormwater facilities shall be
granted in favor of the permittee if access to the stormwater facilities will be restricted by
the sale or lease of any portion of the property.
12. The permittee must maintain compliance with the proposed built -upon area and ensure
that the runoff from all the built -upon is directed into the permitted system.
13. 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.
14. The permittee must maintain the current permitted drainage area. No additional runoff
from outside of the permitted drainage area boundary may enter the permitted stormwater
facilities without first applying for and receiving a permit modification.
III. GENERAL CONDITIONS
This permit is not transferable except after notice to and approval by the Director. In the
event of a change of owership, or a name change, the pennittee 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) which have jurisdiction.
4. In the event that the facilities fail to perform satisfactorily, including the creation of
nuisance conditions, the Permittee shall take immediate corrective action, including those
as may be required by this Division, such as the construction of additional or replacement
stormwater management systems.
The permittee grants DENR Staff permission to enter the property during normal business
hours for the purpose of inspecting all components of the permitted stormwater
management facility.
6. The permit may be modified, revoked and reissued or terminated for cause. The filing of
a request for a permit modification, revocation and reissuance or termination does not
stay any permit condition.
5

State Stormwater Management Systems
Permit No. SW8 030503
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.
.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 23rd day of June, 2003.
NORTH CAROLINA ENVIRONMENTAL MANAGEMENT COMMISSION
Alan W. Klimek, P.E., Director
Z Division of Water Quality
By Authority of the Environmental Management Commission
2

State Stormwater Management Systems
Permit No. SWS 030503
Southport Commons
Stormwater Permit No. SW8 030503
Brunswick County
Designer's Certification
as a duly registered
in the State of North Carolina, having been authorized to observe (periodically/weekly/full time)
the construction of the project,
(Prof ect)
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
Il

-
MRs-
State Stormwater Management Systems
Permit No. SW8 030503
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. The outlet/bypass structure elevations are per the approved plan.
5. The outlet structure is located per the approved plans.
6. Trash rack is provided on the outlet/bypass structure.
7. All slopes are grassed with permanent vegetation.
$. Vegetated slopes are no steeper than 3:1.
9. The inlets are located per the approved plans and do not cause short-circuiting of
the system.
10. The permitted amounts of surface area and/or volume have been provided.
11. Required drawdown devices are correctly sized per the approved plans.
12. All required design depths are provided.
13. All required parts of the system are provided, such as a vegetated shelf, and a
forebay.
14. The overall dimensions of the system, as shown on the approved plans, are
provided.
cc: NCDENR-DWQ Regional Office
Brunswick County Building Inspections

A&K #02281
ni~ r~ rCF_r.rcrr_nrtr_v
Y�Dato Received Fee Paid Permit N14mber
2.,0. w'— D 0Say
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
1. GENERAL INFORMATION
1. Applicants name (specify the name of the corporation, individual, etc. who owns the project):
Tricoast Properties, LLC
2. Print Owner/Signing Official's name and title (person legally responsible for facility and compliance):
Steve Niemeyer, Member/ Manager
3. Mailing Address for person listed in item 2 above:
1508 Military Cutoff Rd., Suite 302
City: Wilmington
Telephone Number: (910) 256-11
NC
9
4. Project Name (subdivision, facility, or establishment name — should be consistent with project name on
plans, specifications, letters, operation and maintenance agreements, etc.):
Southport Commons
5. Location of Project (street address):
Howe Street / NC Hn. 211 T
City: Southport _ County: Brunswick
C. Directions to project (from nearest major intersection):
The site is located approximately 500' south of the intersection of NC
Howe Street toward the Citv of Southport city limits.
7. Latitude: N33° 56' 15" Longitude: W780 02' 00^
8. Contact person who can answer questions about the project:
Name: John A. Kuske, III, P.E. Telephone Number:
11. PERMIT INFORMATION
1. Specify whether project is (check one): X New
Form SWU-101 Version 3.99 Page 1 of 4
iwy. 87 & NC Hwy. 211 1
of project
[phone]
Renewal Modification

2. If this application is being submitted as the result of a renewal or modification to an existing permit, list the
Existing permit number NIA And its issue date (if known) NIA
Specify the type of project (check one):
Low Density X High Density Redevelop General Permit Other
Infiltration Svstem
4. Additional Project Requirements (check applicable blanks):
CAMA Major X Sedimentation/Erosion Control 404/401 Permit NPDES Stormwater
Information on required state permits can be obtained by contacting the Customer Service Center at
1-877-623-6748.
Ill. 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.
Stormwater will be collected from all impervious areas and treated in an onsite below grade infiltration
system. The infiltration system is designed to store and infiltrate the first one inch (1') of runoff. Stormwater
above the 1" storm will bypass the system & go through a 30' minimum vegetated filter.
2. Stormwater runoff from this project drains to the Cape Fear River Basin.
3. Total Project Area: 1.74 AC Site Area 4. Project Built Upon Area: 70.11 %
Drainage area for infiltration system: 1.61 AC Built upon area within drainaqe area = 75.78%
5. How many drainage areas does the project have? 1
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 Area I
Drains Tc Arca 2
Receiving Stream Name
Price Creek
Receiving Stream Class
C-SW
Drains c Area
1.74 AC
Existing Imp ervious * Area
Existing Impervious is being
removed from the site
Proposed Impervious* Area
53,000 SF / 1.22 AC
% Impervious* Area (total)
70.11 % Over total site area
75.78% Over drainage area
Surface Area
Drainage Arca I
Drainage Area 2
—impervious*
On -site Buildings
14,500 SF / 0.33 AC
Both buildings including canopy
On -site Strects
NIA
On -site Parking
37,000 SF / 0.85 AC
On -site Sidewalks
1,500 SF includes pads / 0.04
AC
Other on -site
N/A
Off site
N/A
Total: 53,000 SF / 1.22 AC
Total:
Impervious area is defrned as the built upon area including, but not limited to, buildings, roads, parking areas
sidewalks, gravel areas, etc.
Form SWU-101 Version 3.99 Page 2 of 4

7. How was the off -site impervious area listed above derived?
NIA
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 lot must be provided as an
attachment.
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.
No more than square feet of arty 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.
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.
All permitted runofffrom outparcels orfuture 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 he binding on all parties and persons
claiming under them, that they will run with the land, that the required covenants cannot be changed or deleted
without concurrence from the State, and that they will be recorded prior to the sale of any lot.
V. SUPPLEMENT FORMS
The applicable state stormwater management permit supplement form(s) listed below must be submitted for
each BMP specified for this project. Contact the Stormwater and General Permits Unit at [phone] for
the status and availability of these forms.
Form SWU-102
Wet Detention Basin Supplement
Form SWU-103
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
Form SWU-101 Version 3.99 Page 3 of 4

4. V1. SUBMITTAL REQUIREMENTS
Only complete application packages will be accepted and reviewed by the Division of Water Quality (DWQ).
A complete package includes all of the items listed below. The complete application package should be
submitted to the appropriate DWQ Regional Office.
Please indicate that you have provided the following required information by initialing in the space provided
next to each item.
Initials
•
Original and one copy of the Stormwater Management Permit Application Form �/
• One copy of the applicable supplement form(s) for each BMP 15�/
• Permit application processing fee of $420 (payable to NCDENR)
• Detailed narrative description of stormwater treatment / management
• Two copies of plans and specifications, including:
- Development / Project name
- Engineer and firm
- Legend
- North arrow
- Scale
Revision number & date
Mean high water line
- Dimensioned property / project boundary
Location map with named streets or NCSR numbers
- Original contours, proposed contours, spot elevations, finished floor elevations
- 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.
John A. Kuske, III, P.E.
Designated agent (individual or firm): Andrew & Kuske Consulting Engineers, Inc.
Mailing Address: 902 Market Street
City: Wilmington State: NC Zip:
Phone: [phone]
VIH. APPLICANT'S CERTIFICATION
Fax: [phone]
28401
1, (print or type name of person listed in General Information, item 2) _Steve Niemeyer, Member/ Mgr. ,
Certify that the information included on this permit application form is, to the best of my knowledge, correct and
that the project will be constructed in conformance with the approved plans, that the required deed restrictions and
protective covenants will be recorded, and that the proposed project complies with the requirements of 15A NCAC
2H.1000.
Signature;
Form SWU-101 Version 3.99 Page 4 of 4
Date: /2�G

A&K #02281
Permit No. ? J 50 3
State of North Carolina (to be provided by DWQ)
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
DWQ Stormwater Management Plan Review:
A complete stormwater management plan submittal includes a stormwater management permit application, an
underground trench supplement for each system, design calculations, and plans and specifications showing all
stormwater conveyances and system details.
I. PROJECT INFORMATION
Project Name: Southport Commons
Contact Person: John A. Kuske, III, P.E. Phone Number: [phone]
For projects with multiple infiltration systems, a supplement form must be completed for each system. This
worksheet applies to: Trench One (1 S stem in Drainage Area 1
(from plans) (from Form SWU-10!)
II• DESIGN INFORMATION (attach supporting calculations/documentation):
Soils Report Summary (based upon an actual field investigation and soil borings)
Soil Type Fine to Medium Sand
Infiltration Rate 18 ®in/hr or ❑cflhrlsf (check appropriate units)
SHWT Elevation 18.80, fmsl (Seasonal High Water Table elevation)
48" Below Test Location per ECS, Ltd. (See Report)
50"-52" Below Vincent Lewis' Test Locations (See Memo Attached)
50" is average. See calculations.
Trench Design Parameters
Design Volume 4,700 c.f.
Design Storm 1 inch event (1.5 inch event for SA waters, 1 inch event far others)
Drawdown Time 25.70 days minutes for I" storm
Perforated Pipe Size 2-15" inch diameter
Perforated Pipe Length 1,130 ft. (565 LF of trench with 2-15" pipes = 1,130)
No. Observation Wells NIA (may be required on a case —by-case basis)
Stone Type (if used) No. 4 Washed Stone
Stone Void Ratio 0.40140%
Trench Elevations (in feet mean seal level)
Bottom Elevation 20.80 Fmsl (2' above seasonal high ground water table)
Form SWU-107 Version 3.99 Pagel of4

Top Elevation 22.40
Storage/Overflow Elevation 22,20 fmsl
Trench Dimensions
Height 1.6 ft. Length 565 �t .
Width 13.0 ft. Volume Provided 4;74)a- cu.ft. (First 1")
4,829 cu.ft. @ bypass elevation
III. REQUIRED ITEMS CHECKLIST
The following checklist outlines design requirements per the Stormwater Best Management Practices Manual
(N.C. Department of Environment, Health and Natural Resources, February 1999) and Administrative Code
Section: 15 A NCAC 2H .1008.
Initial in the space provided to indicate 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. if a requirement has not been met, attach justification.
Applicants Initials
ii W a. System is located 50 feet from class SA waters and 30 feet from other surface waters.
c 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).
f. 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).
=;O?qR 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
_ 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
maintenance and has recorded access easements to the nearest public right-of-way.
1. System capture and infiltrates the runoff from the first i A 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.
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.
Side to bottom area ratio is less than 4:1.
s. Observation well(s) are provided (case -by -case basis).
Form S WU-107 Version 3.99 Page 2 of 4

/ 1 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.
W. INFILTRATION BASIN OPERATION AND MAINTENANCE AGREEMENT
l . 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 vegetated
cover to maintain a maximum height of six -inches, and remove trash as needed.
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 1 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.
When the depth at the benchmark reads 2.90' , the accumulated sediment shall be removed
from the system.
The benchmark is the top elevation of the special drop inlet which is elevation 23.40. The
special drop inlet and each infiltration drop inlet has a 2' minimum sediment trap below the
invert of the 15" infiltration pipe invert which is 21.00. The bottom of the sediment trap in the
special junction box and in all infiltration drop inlets is elevation 19.00. Sediment shall be
cleaned out of each box when the 2' sediment trap depth is reduced by 75% to elevation 20.50
or 2.9' below the top benchmark elevation of the special drop inlet which is elevation 23.40.
Form SWU- ] 07 Version 3.99 Page 3 of 4

acknowledge and agree by my signature below that 1 am responsible for maintaining the stormwater
collection system in accordance with the six maintenance procedures listed above. 1 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: Steve Niemeyer, Member 1 Manager
Address: 1508 Military Cutoff Road, Suite 302 Wilmington, NC 28403
Phone: [phone]
Signature:
Date: 04-11-03
Note. The legally responsible party should not be aWmeowners association unless more than 50% of the lots have been sold
and a resident of the subdivision has been named the president.
I, �(, /� z ��ZCI , a Notary Public for the State of &4alli e County of
_ L7l(1lI 1 r/C , do hereby certify that ���hle personally appeared before me this
day of _ �� , and acknowledge the due execution of the foregoing infiltration
basin maintenance requirements. Witness my hand and official seal.
SEAT.
Signature
J'V
ission expires I -e�J
Form S WU-107 Version 3.99 Page 4 of 4