SW8041215_CURRENT PERMIT_20050124

STORMWATER DIVISION CODING SHEET
POST -CONSTRUCTION PERMITS
PERMIT NO.
SW
DOC TYPE
� CURRENT PERMIT
❑ APPROVED PLANS
❑ HISTORICAL FILE
❑ COMPLIANCE EVALUATION INSPECTION
DOC DATE/o2�
YYYYMMDD

STORMWATER DIVISION CODING SHEET
NCG PERMITS
PERMIT NO.
/v
DOC TYPE
❑ HISTORICAL FILE
❑ MONITORING REPORTS
DOC DATE
❑
YYYYM M DD

Michael F. Easley, Governor
William G. Ross, Jr., Secretary
North Carolina Department of Environment and Natural Resources
Alan W. Klimek, P.E. Director
Division of Water Quality
January 24, 2005
Mr. Keith Andrews, President
Keith Andrews Builders, Inc.
4595 Bentley Drive
Wilmington, NC 28409
Subject: Stormwater Permit No. SW8 041215
Osprey Point Townhomes
High Density Project
Pender County
Dear Mr. Andrews:
The Wilmington Regional Office received a complete Stormwater Management Permit
Application for Osprey Point Townhomes on January 24, 2005. 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 041215
dated January 24, 2005, for the construction of the subject project.
This permit shall be effective from the date of issuance until January 24, 2015, 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 Paul Bartlett, or me at [phone].
Sincerely, �7
Ed Beck.
Acting Regional Supervisor
Surface Water Protection Section
ENB/ptb: S:\WQS\STORMWATER\PERMIT\041215
cc: Crystal Coast Engineering, PA
Pender County Building Inspections
Division of Coastal Management
Paul T. Bartlett, P.E.
EV1%ilmingfon=Regional�0:ffice-)
Central Files
North Carolina Division of Water Quality 127 Cardinal Drive Extension Phone [phone] Customer Service 1-877-623-6748
Wilmington Regional Office Wilmington, NC 28405-3845 FAX [phone] Internet: h2o.enr.state.nc.us One
An Equal Opportunity/Affirmative Action Employer— 50% Recycled/10% Post Consumer Paper NorthCarolina
Naturally

State Stormwater Management Systems
Permit No. SW8 041215
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
Keith Andrews and Keith Andrews Builders, Inc.
Osprey Point Townhomes
Pender County
FOR THE
construction, operation and maintenance of four underground infiltration trenches 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 January 24, 2015, 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, consisting of four underground infiltration trenches, has
been approved for the management of stormwater runoff as described in Section
1.6 on page 3 of this permit. The stormwater control has been designed to handle
the runoff from 57,369 square feet of impervious area. The trench systems must
be operated with a 50' 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. The built -upon area for the future
development is limited to 0 square feet.
4. All stormwater collection and treatment systems must be located in either
dedicated common areas or recorded easements. The final plats for the project
will be recorded showing all such required easements, in accordance with the
approved plans.
5. The runoff from all built -upon area within the permitted drainage area of this
project must be directed into the permitted stormwater control system.
Page 2 of 7

i
State Stormwater Management Systems
Permit No. SW8 041215
6. The following design criteria have been provided in the four infiltration trenches
and must be maintained at design conditions:
a
b
c
d
e
f.
9
h
Total Drainage Area, acres: 1.7
Onsite, ft : 73,983,
Offsite, ft2: 0
Total Impervious Surfaces, ft2: 57,369
Design Storm, inches: 1.5
Infiltration Systems:
Infiltration System Item
System
#1
System
#2
System
#3
System
#4
(1) Trench Dimensions, L x W x H,ft
152 x 9 x 2.5
128 x 6 x 2.8
132 x 6 x 2.8
135 x 9 x 2.5
(2) Perforated Pipe Diameter,
Dia.(ft)/Length (ft)
3 pipes ea.:
2.0'� /152' L
2 pipes ea.:
2.0'� /128' L
2 pipes ea.:
2.0'� /132' L
3 pipes ea.:
2.0'�/135' L
(3) Bottom Elevation, FMSL
4.6
4.6
4.6
4.6
(4) Bypass Weir Elev., FMSL
7.1
7.42
7.42
7.1
(5) Permitted Storage Vol., ft3
2228
1343
1385
1978
(6) Time to Draw Down, hrs.
3.25
3.49
3.49
3.25
(7) Seasonal High Water Table,
FMSL
<2.6
2.34
2.54
<2.6
Type of Soil:
Expected Infiltration Rate, in/hr
Receiving Stream/River Basin:
Stream Index Number:
Classification of Water Body:
II. SCHEDULE OF COMPLIANCE
medium to coarse sand
>6.0
Atlantic Ocean
WOK00 99-(4)
"S B"
1. The stormwater management system shall be constructed in its entirety,
vegetated and operational for its intended use prior to the construction of any
built -upon surface.
2. During construction, erosion shall be kept to a minimum and any eroded areas of
the system will be repaired immediately.
3. The permittee shall at all times provide the operation and maintenance
necessary to assure the permitted stormwater system functions at optimum
efficiency. The approved Operation and Maintenance Plan must be followed in
its entirety and maintenance must occur at the scheduled intervals including, but
not limited to:
a. Semiannual scheduled inspections (every 6 months).
b. Sediment removal.
C. Mowing and revegetation of slopes and the vegetated filter.
d. Immediate repair of eroded areas.
e. Maintenance of all slopes in accordance with approved plans and
specifications.
f. Debris removal and unclogging of bypass structure, filter media, flow
spreader, catch basins, piping and vegetated filter.
g. A clear access path to the bypass structure must be available at all times.
Page 3 of 7

State Stormwater Management Systems
Permit No. SW8 041215
4. Records of maintenance activities must be kept and made available upon
request to authorized personnel of DWQ. The records will indicate the date,
activity, name of person performing the work and what actions were taken.
5. The facilities shall be constructed as shown on the approved plans. This permit
shall become voidable unless the facilities are constructed in accordance with
the conditions of this permit, the approved plans and specifications, and other
supporting data.
6. Upon completion of construction, prior to issuance of a Certificate of Occupancy,
and prior to operation of this permitted facility, a certification must be received
from an appropriate designer for the system installed certifying that the permitted
facility has been installed in accordance with this permit, the approved plans and
specifications, and other supporting documentation. Any deviations from the
approved plans and specifications must be noted on the Certification..A
modification may be required for those deviations.
7. If the stormwater system was used as an Erosion Control device, it must be
restored to design condition prior to operation as a stormwater treatment device,
and prior to occupancy of the facility.
8. Access to the stormwater facilities shall be maintained via appropriate
easements at all times.
9. The permittee shall submit to the Director and shall have received approval for
revised plans, specifications, and calculations prior to construction, for any
modification to the approved plans, including, but not limited to, those listed
below:
a. Any revision to any item shown on the approved plans, including the
stormwater management measures, built -upon area, details, etc.
b. Project name change.
C. Transfer of ownership.
d. Redesign or addition to the approved amount of built -upon area or to the
drainage area.
e. Further subdivision, acquisition, lease or sale of all or part of the project
area. The project area is defined as all property owned by the permittee,
for which Sedimentation and Erosion Control Plan approval or a CAMA
Major permit was sought.
f. Filling in, altering, or piping of any vegetative conveyance shown on the
approved plan. ,
10. The permittee shall submit final site layout and grading plans for any permitted
future areas shown on the approved plans, prior to construction.
11. A copy of the approved plans and specifications shall be maintained on file by
the Permittee 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.
Page 4 of 7

State Stormwater Management Systems
Permit No. SW8 041215
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.
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 January 2005.
NORT CAROLINA ENVIRONMENTAL MANAGEMENT COMMISSION
Alan W. Klimek, .E., Director
Division of Water Quality
By Authority of the Environmental Management Commission
Page 5 of 7

State Stormwater Management Systems
Permit No. SW8 041215
Osprey Point Townhomes
Stormwater Permit No. SW8 041215
Pender 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:
Signature
Registration Number
Date
SEAL
Certification Requirements:
Page 6of7

State Stormwater Management Systems
Permit No. SW8 041215
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
Pender County Building Inspections
Page 7 of 7

OFFICE USE ONLY
Date Received
Fee Paid
Permit Number
/3 -a- a "" 0 0 SO, oo rt l ga-a 7-
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 itse as an original
I. GENERAL INFORMATION
1. Applicants name (specify the name of the corporation, individual, etc. who owns the project):
Keith Andrews Builders, Inc.
2. Print Owner/Signing Official's name and title (person legally responsible for facility and compliance):
Keith Andrews, President
3. Mailing Address for person listed in item 2 above:
4595 Bentley Drive
City: Wilmington State. NC Zip: 28409
Telephone Number: ( 910 ) 791-9065 FAX 'j P S'cw• 2,
4. Project Name (subdivision, facility, or establishment name - should be consistent with project name on plans;
specifications, letters, operation and maintenance agreements, etc.):
Osprey Point Townhomes
5. Location of Project (street address):
New River Drive (N.C.
City: Surf
210) near intersection with Shell Drive
6. Directions to project (from nearest major intersection):
County:Pender
From the intersection US 17 & NC 50, east on NC 50 approx. 5.3 miles to New River Drive (NC 210), turn left on
New River Drive approximately 0.8 miles, site on right.
7. Latitude: 340 26' 03" N
Longitude: 770 31' 56" W
8. Contact person who can answer questions about the project:
of project
Name: David K. Newsom, PE (Crystal Coast Engineering, PA) Telephone Number: ( 910 ) 325-0006
II. PERMIT INFORMATION:
1. Specify whether project is (check one): X New Renewal Modification
Form SWU-101 Version 3.99 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 NIA .and its issue date (if known) NIA
S
3. Specify the type of project (check one):
Low Density X High Density Redevelop General Permit Other
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
I. 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.
First 1.5" of stormwater will be collected and diverted to Infiltration 'Trenches. Stormwater in excess of first 1.5" will
bypass trenches and discharge via vegetated filter.
2. Stormwater runoff from this project drains to the Cape Fear River basin.
3. Total Project Area: 1.70 acres 4. Project Built Upon Area: 77.5
5. How many drainage areas does the project have? 4
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
Drainage Area 2
Receiving Stream Name
Intracoastal Waterway
Intracoastal Waterway
Receiving Stream Class
SA;HQW
SA;HQW
Drainage Area
23,574 sf (0.54 ac)
12,019 sf (0.27 ac)
Existing impervious* Area
6,034 sf
-0-
Proposed impervious*Area
12,409 sf (0.28 ac)
11,243 sf (0.26 ac)
% Impervious* Area (total)
78.23 %
93.54 %
Impervious* Surface Area
Drainage Area I
Drainage Area 2
On -site Buildings prop/exist
3,268 sf / 6,034 sf
3,277 sf / -0-
On-site Streets prop/exist
-04-0-
-04-0-
On-site Parking prop/exist
7,446 sf I -0-
7,166 sf / -0-
On-site Sidewalks prop/exist
695 sf / -0-
300 sf / -0-
Other on -site prop/exist
-0-/-0-
-0-/-0-
Reserve for Future
1,000 sf
500 sf
proposedlexisting
Total: 12,409 s1'(0.28 ac)16,034 sf (0.14 ac)
Total: 11,243 sf (026 ac)/-0-
* Impervious area is defined as the built upon area including, but not limited to, buildings, roads, parking areas,
sideivalks, gravel areas, etc.
e�
Form SWU-101 Version 3.99 Page 2 of 'I01
IpN

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) N/A
3. Specify the type of project (check one):
Low Density X High Density Redevelop General Permit Other
4, Additional Project Requirements (check applicable blanks):
�CAMA Major X Sedimentation /Erosion Control _404/401 Permit NPDES Stortnwater
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.
First l .5" of stormwater will be collected and diverted to Infiltration Trenches. Stormwater in excess of first 1.5" will
bypass trenches and discharge via vegetated filter.
2. Stormwater runoff from this project drains to the Cape Fear River basin.
3. Total Project Area: 1.70 acres
5. How many drainage areas does the project have?
d
4. Project Built Upon Area: 77-5 %
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 3
Drainage Area 4
Receiving Stream Name
Intracoastal Waterway_Intracoastal
Waterway
Receiving Stream Class
SA;HQW
SA;HQW
Drainage Area
12,268 sf (0.28 ac)
26,122 sf (0.60 ac)
Existing Impervious* Area
-0-
6,229 sf
Proposed impervious*Area
11,606 sf (0.27 ac)
9,848 sf (0.23 ac)
% Impervious* Area (total)
94.60 %
61.55 %
Impervious* Surface Area
Drainage Area)
Drainage Area
On -site Buildings prop/exist
3,277 sf /-0-
3,286 sf 1 6,229 sf
On -site Streets prop/exist
-0-/-0-
-0-/-0-
On -site Parking prop/exist
7,487 sf /-0-
4,861 sf / -0-
On-site Sidewalks prop/exist
342 sf / -0-
701 sf /-0-
Other on -site prop/exist
-0-/-0-
-0-/-0-
Reserve for Future 1prop/exist)
500 sf / -0-
1,000 sf / -0-
proposed/existing
Total: 11,606 sf (0.27 ac)/ 0
Total: 9,848 sf(0.23 ac)/6,229 sf (0.14 ac)
* Impervious area is defined as the built upon area including. but not limited to, buildings, roads. parking areas.
sidex-alks, gravel areas, etc.
Form S W U-10 l version 3.99 Page 2 of 4 • ry. • 1 is r
BAN n� l}>;l5
r

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
NIA as issued by the Division of lVater Quality. These covenants may not be
changed or deleted without the consent of the State.
2. No more than NIA 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 he f lled 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 oulparcels 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) listed below must be submitted for each
BMP specified for this project. Contact the Stormwatcr 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

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.
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
• Permit application processing fee of (payable to NCDENR)''irT7'&tcU_
• 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
- Details of roads, drainage features, collection systems, and stormwaler 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): Crystal Coast Engineering, PA
Mailing Address: 3817-3 Freedom Way
City: Hubert
State: NC
Zip: 28539
Phone: [ 9_10 ) 325-0006 Fax: ( 910 ) 325-0060
VIII. APPLICANT'S CERTIFICATION
I, (print or type name of person listed in General Information, item 2) Keith Andrews
certify that the infornation 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 21-1.1000. , 1-1 /
Signature:
Form SVU-101 Version 3.99 Page 4 of 4
Date:! ` ad 1

I
Permit Nol#9 0�1-2-/Y
(to be provided by 901Q)
State of North Carolina
Department of Environment and Natural Resources
Division of Water Quality
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
UNDERGROUND INFILTRATION TRENCH SUPPLEMENT
T his form mq be photocopied for use as an original
DWQ Stormwater Management.!!] an 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.
L PROJECTINFORMATION
Project Name: Osprey Point Townhomes
Contact Person: David K. Newsom, PE Phone Number: 910 3254)006
For projects with multiple infiltration systems, a supplement form must be completed for each system. This
worksheet applies to: Trench 1 in Drainage Area 1
(from plans) Uj mn Form SW IJ-1 U1)
11. DESIGN INFORMATION (attach supporting calculations/documentation):
Soils Report Summary (based upon an actual field investigation and soil borings)
Soil Type
Sand
Infiltration Rate
>6 ins �6li ,€rr r cfihr/sf (circle appropriate units)
SHWT Elevation
< 2.60 fmsl (Seasonal High Water Table elevation)
Trench Design Parameters
(I�tW
Design Volume
2,222
Design Storm
1.5"
inch event (1.5 inch event for.V waters. 1 inch evens for others)
Drawdown Time
•14
days
Perforated Pipe Size
24"
inch diameter
Perforated Pipe Length
152
ft.
No. Observation Wells
NIA
(may be required on a case -by -case basis)
Stone Type (if used)
#57
Stone Void Ratio
4M.
Trench Elevations (in feet mead sea level)
VD
Bottom Elevation
4•60
fmsl VIEA,
Storage/Overflow Elevation
7-10
fmsl
Donn SWU-107 Rev 3.99
Page 1 of 4

Trench Dimensions
Height 2.5 ft. Length 152 ft.
Width 9 ft. Volume Provided 2,234 cu,ft.
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, 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.
Applicants initials
/C/C/ a. System is located 50 feet from class SA waters and 30 feet from other surface waters.
i - 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),
LI'//IJ 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).
2D_444/ _ 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.
4�Vll/ 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 night -of -way.
C omm arU /}e-C-tt,
IX/)/�_ 1. System captures and infiltrates the runoff from the first 1.0 inch of rainfall(1. i h event
for areas draining to SA waters ).
D IM/ m. Drainage area for the device is less than 5 acres.
IIAZ n. A pretreatment device ( filter strip, grassed swale, sediment tra etc.) is provided.
o. Trench bottom is covered with a layer of clean sand to an average depth of 4 inches.
JZY6N _ p. Sides of the infiltration trench are lined with geotextile fabric.
0)101 q. Rock used is free of fines (washed stone) and has a large void ratio.
Lik r. Side to bottom area ratio is less than 4:1.
Form 5WU-107 Rev 3.99 Page 2 of 4

s. Observation well(s) are 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 plans.
YY'41 u. A benchmark for checking sediment accumulation is provided.
1V. UNDERGROUND INFILTRATION TRENCH OPERATION AND MAINTENANCE AGREEMENT
! . After every runoff producing rainfall event and at least monthly inspect the bypassloverflow 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.
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 l 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.
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 0.67 the accumulated sediment shall be removed
from the system.
Form SWU-107 Rev 3.99 Page 3 of 4

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: Keith Andrews , ?R ES t k'�-6 tv
Address:— --- y .5 9 6, BEN 1—L u- WI Lm, 0 t me
Phone:[phone] Date: l2` ; 7—
Signature:
Note: The legally responsible party should not be a homeowners association unless more than SO% of the lots have been sold and a
resident of the subdivision has been named the president.
a Notary Public for the State of A dzr6 Il h c County of D�V , do hereby certify that /f �t ,�l ieGl1S _ personally appeared before me this 2-
7
day of hecc m b-e tr I I w4A j and acknowledge the due execution of the forgoing infiltration basin maintenance
requirements. Witness my hand and official seal,aq
G L I� NrK/T.
,//���
••7p�
w w � NOTARY• � a.
�auC r, My commission expires ko Vern le, r �� v( b a 9
/�</��QW COu ,�•l\\��\
Form SWU-107 Rev 3.99 Page 4 of 4
C—

Permit No. 'Y Lt'8 D 4 i21'
(to be provided by UWQ)
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 far 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.
L PROJECT INFORMATION
Project Name: Osprey Point Townhames
Contact Person: David K. Newsom, PE
Phone Number: ( 910 ) 3254)006
For projects with multiple infiltration systems, a supplement form must be completed for each system. This
worksheet applies to: Trench 2 in Drainage Area 2
(from plans) (from Form SIVU-101)
11. DESIGN INFORMATION (attach supporting calculations/documentation):
Soils Report Summary (based upon an actual field investigation and soil borings)
Soil Type Sand
Infiltration Rate �1-6 innir I inlhr r cf/hr/sf (circle appropriate units)
SHWT Elevation Z< msl (Seasonal High later Table elevation)
Trench Design Parameters
Design Volume 1,341) C. f.
Design Stomi 1.5" inch event (1.5 inch event for SA waters, 1 inch event jbr others)
Drawdown Time
Perforated Pipe Size
Perforated Pipe Length
No. Obsen ation Wells
Stone Type (if used)
Stone Void Ratio
.15 days
24" inch diameter
its ft.
NIA
#57
40%
(may be required on a case -by -case basis)
Trench Elevations (hi feet mean sea level)
Bottom Elevation 4•60 fmsl
Storage/Overflow Elevation _ _ 7.42 fmsl
Fonn SWU-107 Rev 3.99 Page 1 of 4
�p� 'A

Trench Dimensions
Height 2.8 ft. Length 128 ft.
Width G ft. Volume Provided 1,344 cu.ft.
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, 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.
Applicants Initials
a. System is located 50 feet from class SA waters and 30 feet from other surface waters.
z7,C2i . 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.
w Z7/(l1/ 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).
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.
4K 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.
CbmmoN Aksq
1. System captures and infiltrates the runoff from the first 1.0 inch of rainfall Och event
for areas draining to SA waters ).
041Z __ m. Drainage area for the device is less than 5 acres.
Z2/L41 i n. A pretreatment device ( filter strip, grassed swat(sed m�traptc.)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.
r. Side to bottom area ratio is less than 4:1.
Form SWU-107 Rev 3.99 Page 2 of 4

s. Observation well(s) are 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 plans.
u. A benchmark for checking sediment accumulation is provided.
IV. UNDERGROUND INFILTRATION TRENCH 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.
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.
The water level in any monitoring wells will be recorded after a l 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.
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 0.67 , the accumulated sediment shall be removed
from the system.
Form SWU-107 Rev 3.99 Page 3 of 4

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: Keith
Address: 3 HI-Brim=r-Dane
Phone: [phone]
Signature:
Date:_ - ..._.1 a — ;2 7—
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, Cella- Cli n Jl��I �,_�c� 12 a Notary Public for the State of NI�a
O_ 1 e_ ►�lwo— , County of -7
iYlS1 �1ti1 do hereby certify that 1` 1 ��W S personally appeared before me this 9 1
day o DD and acknowledge the due execution of the forgoing infiltration basin maintenance
requirements. Witness my hand and official seal,
LU
T
(
'•j � � . � • � .'�?� My commission expires b tl,'!'YL,hPr
tS� f1l r I CQV`�.�
Form SWU-107 Rev 3.99 Page 4 of 4

• a a
.. � _
t: .. ,. .!r ...
-�-
.. 1�, � �
n ti y.
fI

Permit No.
(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 _Reyiew.-
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: Osprey Point Townhomes
Contact Person: David K. Newsom, PE _ Phone Number: 910 325-0006
For projects with multiple infiltration systems, a supplement form must be completed for each system. This
worksheet applies to: Trench 3 in Drainage Area 3
(from plans) (from Morin S{i'U-101)
11. DESIGN INFORMATION (attach supporting calculations/documentation):
Soils Report Summary (based upon an actual.feld investigation wid soil borings)
Soil Type Sand
Infiltration Rate �6 iglu �irr cf/hr/sf (circle appropriate units)
SHWT Elevation 2• fmsl (Seasonal High Water Table elevation)
p
Trench Design Parameters
Design Volume 1,382 c, f.
Design Storm 1.50 inch event (1.5 inch event for Sig waters, 1 inch event for others)
Drawdown Time .15 days
Perforated Pipe Size 24" inch diameter
Perforated Pipe Length 132 ft.
No. Observation Wells N/A (may be required on a case -by -case basis)
Stone Type (if used) #57
Stone Void Ratio 40%
1
Trench Elevations (in feet mean sea level)
Bottom Elevation 4.6o fmsl
Storage/Overflow Elevation 7.42 fmsl
ForM SWU-107 Rev 3.99 Page 1 of'4

Trench Dimensions
Height 2.8 ft. Length 132 ft,
Width 6 ft. Volume Provided 1,386 cu.ft.
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, 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.
Applicants 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.
7nZz- 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).
7«/I/ g. Soils have a minimum hydraulic conductivity of 0.52 inches per hour.
,421444Z 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.
, VAI 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
m�ntenance aQdd has recorded access easements to the nearest public right-of-way.
o mm orN e(x.
1. System captures and infiltrates the runoff from the first 1.0 inch of rainfall Onch event
for areas draining to SA waters ).
in. Drainage area for the device is less than 5 acres.
4QC4 ,- n_ A pretreatment device( filter strip, grassed swale, 4iietc.) is provided.
Q / o. Trench bottom is covered with a layer of clean sand to an average depth of 4 inches.
t2lCILI P. Sides of the infiltration trench are lined with geotextile fabric.
4D6i4, 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 5WU-107 Rev 3.99 Page 2 of 4

s. Observation well(s) are 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 plans.
u. A benchmark for checking sediment accumulation is provided.
IV. UNDERGROUND INFILTRATION TRENCH OPERATION AND MAINTENANCE AGREEMENT
1. 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.
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 I 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 0.67 , the accumulated sediment shall be removed
from the system.
Forin S WU-107 Rev 3.99 Page 3 of 4

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: Keith Andrews , �91r S 1l�F N7
Address:34i';PR.aOwer+aw
r. C
Phone: [phone] Date:
Signature: T
Note: The legally responsible party should not he a homeowners association unless more than 50% of the lots have been sold and a
resident of the subdivision has been named the president.
1, C t%i ta
I a . Z 0 1 n kk VI lkecL r, j -a Notary Public for the State of I aA 01 rU I1_ne" County of
I Ons b LU , do hereby certify that t� e l `ti 6rd reSUS personally appeared before me this o?
day of beG-C M �.'P e)&Lz wand acknowledge the due execution of the forgoing infiltration basin maintenance
requirements. Witness my hand and official seal,
�`1 N K iN40 1Z
S.SFAI My commission expiresf/11
l
Form SWU-107 Rev 399 Page 4 of 4

4 .,

f Permit No. �T U,)
(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 farm may he photocopied for use as mi 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.
1. PROJECT INFORMATION
Project Name: Osprey Point TOwntDmes
Contact Person: David K. Newsom, PE Phone Number: ( 910 ) 3254)006
For projects with multiple infiltration systems, a supplement form must be completed for each system. This
worksheet applies to: Trench 4 in Drainage Area 4
(from plans) (From Form SWU401)
If. DESIGN INFORMATION (attach supporting calculations/documentation):
Soils Report Summary (based upon an actual field investigation and soil borings)
Soil Type
Sand
Infiltration Rate
'6 immr A r r cf/hr/sf (circle appropriate units)
SHWT Elevation
fmsl (Seasonal High Water "fable elevation)
Trench Design Parameters
W
Design Volume
1,972
C. f.
Design Storm
1.5"
inch event (1.5 inch event for&4 waters, 1 inch event.for others)
Drawdown Time
•14
days
Perforated Pipe Sipe
24"
inch diameter
Perforated Pipe Length
135
ft.
No. Observation Wells
N/A
(may be required on a case -by -case basis)
Stone Type (if used)
#57
Stone Void Ratio
40%
Trench Elevations (its feet mean
sea level)
4.60
G
4 �4u�
Bottom Elevation
frnsl JAN %
Storage/Overflow Elevation
7.10
fmsl -
Lorin SWU-107 Rev 3.99
Page 1 of 4

Trench Dimensions
Height 2.5 ft. Length 135 ft.
Width 9 ft. Volume Provided 1,984 cu.ft.
111. 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; 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.
Applicants Initials
a. System is located 50 feet from class SA waters and 30 feet from other surface waters.
�t7 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.
PrL/! _ 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).
% z 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.
f Al-_ 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.
.F71GJIZ 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 captures and infiltrates the runoff from the first 1.0 inch of rainfall l.S ch event
for areas draining to SA waters ).
On Z m. Drainage area for the device is less than 5 acres.
/JrcAl_ _ n. A pretreatment device ( filter strip, grassed swal sediment trap, etc.) is provided.
_ , (n/ o. Trench bottom is covered with a layer of clean sand to an average depth of 4 inches.
IDL-W p. Sides of the infiltration trench are lined with geotextile fabric.
Qi(,q. Rock used is free of fines (washed stone) and has a large void ratio.
�JIAI r. Side to bottom area ratio is less than 4:1.
Form SWU-107 Rev 3.99 Page 2 of 4

s. Observation well(s) are provided (case -by -case basis).
lif41 t. Vegetated filter is provided for overflow (50 feet for SA waters, 30 feet for other waters)
and detail is shown on plans.
LMdz u. A benchmark for checking sediment accumulation is provided.
IV. UNDERGROUND INFILTRATION TRENCH 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.
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 I 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 0.67 , the accumulated sediment shall be removed
from the system.
Fonn SWU-! 07 Rev 3.99 Page 3 of 4

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: Keith Andrews �kr-Sjb irz11T
Address: -?iENTLE`l bk. V`1iL.A NV"(,TON, NC
Phone:[phone]
Signature:
Date: I A� — Z - 4 C
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.
aNotary Public for the State of 1V�Tfi�I �f'o�r►lo- County of
j. ��a ,�, do hereby certify that Z% t A 4ijk f - VU S personally appeared before me this dZ�
day of _r �G�-1)1 C 00 and ac4nowlledge the d e execution of the forgoing infiltration basin maintenance
requirements. Witness my hand and official seal, f / �r/ �J
L � L�f/iL�LLi�I'.L�,t�
C L l N,�/
v
•7
v; NOTARY •A =
PUBLIC I
` I , 07 Q y • SEAL . V-`� My commission expires d >I2m 9
Form SWU-107 Rev 3.99 Page 4 of 4

� i•