SW8060810_CURRENT PERMIT_20061027

STORMWATER DIVISION CODING SHEET
POST -CONSTRUCTION PERMITS
PERMIT NO.
SW 8nQO���
DOC TYPE
CURRENT PERMIT
(❑ APPROVED PLANS
❑ HISTORICAL FILE
❑ COMPLIANCE EVALUATION INSPECTION
DOC DATE
WYYMMDD

w A rERQ�
� y
October 27, 2006
Mr. John Melvin, Manager
Barker and Melvin, LLC
6800 Wrightsville Avenue #7
Wilmington, NC 28403
Subject: Stormwater. Permit No. SW8 060810
Campus Square
High Density Project
New Hanover County
Dear Mr. Melvin:
Michael F. Easley, Governor
William G. Ress Jr., Secretary
North Carolina Department of Environment and Natural Resources
Alan W. Klimek, P.E. Director
Division of Water Quality.
The Wilmington Regional Office received a complete Stormwater Management Permit
Application for Campus Square on September 28, 2006. Staff review of the plans and
specifications has determined that the prVJct, as proposed, will comply with the Stormwater
Regulations set forth in Title 15A NCAC 2H.1000. We are forwarding Permit No. SW8 060810
dated October 27, 2006, for the construction of the subject project.
This permit shall be effective from the date of issuance until October 27, 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 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].
Sincer r,
Ed ar eck
Regional Supervisor
Surface Water Protection Section
ENB/ptb: S:IWQSISTORMWATERIPERMIT1060810.oct06
CC' Garry S. Pape, P.E., Withers & Ravenel, Inc.
Tony Roberts, New Hanover County Building Inspections
City of Wilmington Stormwater Services
Beth E. Wetherill, New Hanover County Engineering
Paul T. Bartlett, P.E.
Wilmington Regional Office
Central Files o�z
NarihCarolina
71 aturallJ
North Carolina Division of Water Quality 127 Cardinal Drive Extension Wilmington, NC 29405 Phone [phone] Customer Service
Wilmington Regional Office Internet: www.ncA,ateryuality.org Fax [phone]
An Equal OpportunitylAf irmative Action Employer — 50% Recycled110% Post Consumer Paper

State Stormwater Management Systems
Permit No. SW8 060810
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
John Melvin and Barker and Melvin, LLC
Campus Square
New Hanover County
FOR THE
construction, operation and maintenance of an underground infiltration trench 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 27, 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 1.6 on page 3 of this permit. The stormwater
control has been designed to handle the runoff from 48,941 square feet of
impervious area. This trench 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. There.is no allotment for future built -upon
area at the site.
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 2of7

State Stormwater Management Systems
Permit No. SW8 060810
6. The following design criteria have been provided in the infiltration trench and
must be maintained at design conditions:
a. Drainage Area, acres: 1.30
Onsite, ft2: 56,618
Offsite, ft2: None
b. Total Impervious Surfaces, ft2:
48,941
Onsite Buildings, ft :
17,088
Onsite Parking/Pavpent, ft2:
26,108
Onsite Sidewalks, ft :
1,014
OS Other (permeable pave.@60% of tot. amount), ft2:
4,731
C. Design Storm, inches:
1.0
d. Trench Dimensions, L x W x H, ft: 80 x 70 x 1.37
e. Perforated Pipe Diameter/Length: 15"012,160' L
f. Bottom Elevation, FMSL: 35.0
g. Bypass Weir Elevation, FMSL: 36.37
h. Permitted Storage Volume, ft3: 4,003
i. Type of Soil: Craven, Murville & Seagate
j. Expected Infiltration Rate, inlhr: 9.0
k. Seasonal High Water Table, FMSL: 33.0
I. Time to Draw Down, hours: 1.0
M. Receiving Stream/River Basin: Burnt Mill Creek 1 Cape Fear
n. Stream Index Number: 18-74-63-2
o. Classification of Water Body: "C; Sw"
II. SCHEDULE OF COMPLIANCE
1. The stormwater management system shall be constructed in its entirety,
vegetated and operational for its intended use prior to the construction of any
built -upon surface.
2. During construction, erosion shall be kept to a minimum and any eroded areas of
the system will be repaired immediately.
3.. The permittee shall at all times provide the operation and maintenance
necessary to assure the permitted stormwater system functions at optimum
efficiency. The approved Operation and Maintenance Plan must be followed in
its entirety and maintenance must occur at the scheduled intervals including, but
not limited to:
a. Semiannual scheduled inspections (every 6 months).
b. Sediment removal.
C. Mowing and revegetation of slopes and the vegetated filter.
d. Immediate repair of eroded areas.
e. Maintenance of all slopes in accordance with approved plans and
specifications.
f. Debris removal and unclogging of bypass structure, 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.
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.
Page 3 of 7

State Stormwater Management Systems .
Permit No. SW8 060810
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.
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.
Page 4 of 7

State Stormwater Management Systems
Permit No. SW8 060810
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 27th day of October 2006.
NOR .f9 CAROLINA ENVIFj NMENTAL MANAGEMENT COMMISSION
for Alan 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 060810
Page 1 of 2
Campus Square
Stormwater Permit No. SW8 060810
New Hanover Countv
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. SW8 060810
Page 2 of 2
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
Tony Roberts, New Hanover County Building Inspections
Page 7 of 7

OFF 1Ch USE ONLY
ate Received
Fee Paid
Permit Number
4 b . on 104
I,J
State of North Carolina
Department of Environmental and Natural Resources
Division of Water Quality
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
This f win may he photocopied for use cis an original
I. GENERAL INFORMATION
1. Applicant name (specify the name of the corporation, individual, etc. who owns the project):
13arke elvin, LLC
�f,IJoOfiz�
2. Print Owner/Signing Official's name and title (person legally responsible for facility and compliance):
John Melvin, Manager
3. Mailing Address for person listed in Item 2 above:
6800 Wriuhtsville Ave 97
City: Wilmington _
Telephone Number: [phone]
State: NC Zip: 28403
4. Project Name (subdivision, facility, or establishment name — should be consistent with project name on plans,
specifications, letters, operation and maintenance agreements, etc.):
Campus Square
5. Location of Project (street address):
Intersection of Kerr Ave and Randall Parkway in the City of Wilmington, North Carolina
City: wilmin€rton County: New Hanover
6. Directions to project (from nearest major intersection):
Project is located at the Southwest corner of the intersection of Kerr Ave and Randall Parkway,_
7. Latitude: 34" 13' 52" N Longitude: 770 53' 16" W of project.
8. Contact person who can answer questions about the project::
Name: Garry S. Papc, PE Telephone Number: ( 910)256-9277
II. PERMIT INFORMATION.
I . Specify whether project is (check one): _.X.— New IRenewal Modification
Form SWU-101 Version 3.99 Page I of

g /z l �19to -- & V 4--- y-, /1- z i- wg c) 66 616
2. If this application is being submitted as the result of a renewal or modification to an existing permit, list the
existing permit number and its issue date (if known)
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 Sedimentation/Erosion Control 404/401 Permit NPDES Stormwaler
Information on required state permits can be obtained by contacting the Customer Service Center at
1-877-623-6748
III. PROJECT INFORMATION
1. In the space provided below, summarize how stormwater will be treated. Also attach a detailed narrative
(one to two pages) describing stormwater management for the project.
Stormwaler will be treated by the use of an underground infiltration system
2. Stormwater runoff from this project drains to the Cape Fear
3. Total Project Area: 2.60 acres.
4. Project Built Upon Area: 43.1 %.
5. How many drainage areas does the project have? 1
River Basin.
6. Complete the following information for each drainage area. If there are more than two drainage areas in the
project, attach and additional sheet with the information for each area P�rovided in the same format as below.
Basin Information
Drainage Area I
P7P5 Draina�e Area 2
Receiving Stream Name
Unnamed Trib to Mill Creek
Receiving Stream Class
C; SW
Drainage Area
56,618 sf 1.30 ac
Existing Impervious Area
- 0 -
Pro osed Impervious* Area
48,941 sf— 1.12 ac
% Impervious* Area Total
86.4%
Impervious* Surface Area
Drainage Area 1
Drainage Area 2
On -Site Buildings
17,088 sf
On -Site Streets
- 0 -
On -Site Parkin 7 Pavement
26,108 sf
On -Site Sidewalks
1,014 sf
Other On -Site (Permeable
Pavement
7,885 sf use 6.0% = 4,731 sf
Off -site
- 0 -
Total:
48,941 sf — 1.12 ac
*hnpervious area is defined 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 of4

I -low was the off site impervious area listed above derived?
IV. DEED RESTRICTIONS AND PROTECTIVE COVENANTS
The following italicized deed restrictions and protective covenants are required to be recorded for all
subdivisions, out parcels, 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 interncled to ensure ongoing comnpllance with state stormtiVater management
permit number as 1S,Sued by the Division of Water Quality. These covenants may ]lot
be changed or deleted without the consent of the State.
2. No more than square feel of any lot shall be covered by structures or nm l)ervnous materials.
Innpe'rvlons materials inclu(le asl)halt, gravel, concrete, brick, stone, stale or similar material but not include
wood decking or the water surface of swimming pools.
3. Swales shall not be filled in, piped or altered except as necessmy to provide driveway crossings.
4. Binh-upoln area ill excess of the permitted amount requires a state stormlwate'r management permit
modTflcatlon I)rnor to construction.
5. All permitted runofffrom the outparcels or f 11ure development shall he directed into the permitted
ston'lnTwate'r conlrol systennn. These connections to the slorinwate'r control system shall be pentrmed ill a
manner that maintains the integrity and performance of the System as pe'rrmlled.
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 perinit supplement forms) listed below must be submitted for
each BMP specified for this project. Contact the Storm water and General Permits Unit at [phone] for
the status and availability ofthese 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

VL 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.
• Original and one copy of the Stormwater Management Permit Application Form
• One copy of the applicable Supplement Form(s) for each 13MP
• Permit application processing fee of $429 ( ayable to NCDGNR) 46+ice Ee��rs
• Detailed narrative description of stormwater treatmenUmanagement
• 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 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): Withers & Ravenel, Inc.
Mailing Address: _ 7040 Wrightsville Ave, Suite 101
City Wilmington State: NC Zip: 28403
Phone: _( 910) 256-9277 Fax: [phone]
VIII. APPLICANT'S CERTIFICATION
1, �I)i-int of tjy)e name ofperson listed in General Ij formalion, Item 2) John Melvin
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 211, --7 J
Signature: Date: 1 2 6 f 0
Form SWU-10,1~/ Version 3.99 Page 4 of 4

r,���. ram.�/�1�. r -z Permit No. c� Ws g6ogl e)
� .
(to be provided by ❑WQ)
State of North Carolina
Department of Environment and Natural Resources
Division of Water Quality
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
UNDERGROUND INFILTRATION TRENCI-I SUPPLEMENT
Thisfibrin may be photo copied 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: Campus Square
Contact Person: Garry S. Pape, 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 in Drainage Area 1
(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 Craven, Murville & Seagate
Infiltration Rate 9.0 Fnp or cflhr/sf (circle appropriate units)
SFIWT Elevation 33.0 finsl (Seasonal High Water Table elevation)
Trench Design Parameters
Design Volume
Design Storm
Drawdown 'l'imc
3,907 _ c.f.
1.0 inch event (1.5-inch vent for SA waters, 1 inch for others)
0.06 days
Perforated Pipe Size 15" inch diameter
Perforated Pipe Length 2,160 _ft.
No. Observation Wells N/A (may be required on a case -by -case basis)
Stone Type (if used) 957 Washed Stone
Stone Void Ratio 40 %
Trench Elevations (in feet mean sea level)
Bottom Elevation 35.00 fmsl
Storage/Overflow Elevation 36.37 fmsl
FornnSWU-107 R60.99
Page t of

eZJ IC)& At �' Iecr �, 2
Trench Dimensions
I-leight LAB �'"ft.e
Width 70 ft.
III. REQUIRED ITEMS CHECKLIST
s-C4),9 496d616v
Length 80 t ��
Volume Provided „S-7'I"� ` I cu. ft.
The following checklist outlines design requirements per the Stormwater Hest Management Practices manual
(N.C. Department of Environment, 1-fealth and Natural Resources, November 1995) and Administrative Code
Section: 15 A NCAC 21-1.1008.
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
_hnpa. System is located 50 feet from class SA waters and 30 feet from other surface waters.
_biX b. System is located at least 100 feet from water supply welIs.
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.
Yee. 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).
bs�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.
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 easernent for the purposes of operation and maintenance
and has recorded access easements to the nearest public right-of-way.
01. S stem captures and infiltrates the runoff from the first l .0 inch of rainfall 1.5 inch event for areas
Y p (
draining to SA waters).
_j.=e m. Drainage area for the device is less than 5 acres.
n. A pretreatment device (filter strip, grassed swale, sediment trap, etc.) is provided.
k�b_ o. Trench bottom is covered with a layer of clean sand to an average depth of 4 inches.
FormSWU-107 R60.99 Page 2 of4

'` 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.
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. UNDLRGROUND 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.
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 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 21-1.1000 must be designed, approved and constructed.
G. 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.
Each drop inlet structure has a sump that sits one foot below the infiltration system. When the
depth of the structures reaches 0.90 feet the accumulated sediment shall he removed from the
system.
FormSWU-107 R60.99 Page 3 of

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: John Melvin, Manager
Address: 6800 Wrightsville Ave 47, Wilmin�,ton, NC 28403
Phone:
Signature:
Date: 1 I Z 6 E O 6
Note: The lly responsible party should not be a homeoitwei-s association unless more than 50% of the lots
have been sold and a resident of'lhe subdivision has been named the president.
GarokPz.
Lz , a Notary Public for the State of ),�4V) County of
� r�aJ2r , do hereby certify that : 'MG\V' personally appeared
before me this day ofand acknowledge the due execution of the forgoing infiltration
basin maintenance requirements. Witness my hand and official seal,
40
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My commission expires
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formSWU-107 R60.99 Page 4 of

PERMEABLE PAVEMENT CHECKLIST
A washed agTregate base must be used. and washed 57-size stone is generally acceptable. Fine particles from standard "crusher run" will clog the
X pores at the bottom of the pavement and will not be allowed.
X Low traffic volume — less than 100 vehicles per day.
As shown in Figure 3.10-3 below, seasonally high water table must be at least 2 ft from the base of the permeable pavement or gravel storage layer.
X Water tables approaching the permeable pavement system will not allow water to exfiltrate.
Permeable pavement should not be placed where upland land disturbance is occurring or will potentially occur. Land disturbance upland of the lot
X could result in frequent pavement clogging.
X Avoid overhanging trees above the permeable pavement installation.
The completed permeable pavement must be installed at a grade less than 0.5%. Steeper slopes will reduce the storage capacity of the permeable
X pavement.
During preparation of the subgrade, special care must be made to avoid compaction of soils. Compaction of the soils can reduce the infiltration
X capacity of the soil.
Permeable pavement should not be, designed to receive concentrated flow from roofs or other surfaces. Incidental run-on from stabilized areas is
permissible, but the permeable pavement should primarily be designed to infiltrate the rain that falls on the pavement surface itself. No credit will be
X Given for volume or peak reduction for run-on from impervious surfaces.
X Permeable pavement systems are not allowed in areas, such as buffers, where impervious surfaces are not permitted.
The construction sequence will be inspected to insure that the surface installation is planned to be completed after adjacent areas are stabili ed with
X* vegetation. Run-on to the permeable pavement from exposed areas can cause the system to perform-ineffee v`ely. ��111 t I I ►1/�
*TO 6E COMPLETED DURING CONSTRUCTION ."'_*. J \��� 0 //
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CAMPUS SQUARE
OPERATION AND MAINTENANCE AGREEMENT FOR PERMEABLE PAVEMENT
Per'I`able 3.10-1 of the NCDWQ Policy on Use oi- Permeable Pavement Systems
Initial inspection to'be performed monthly for 3 montlis after installation
2. Ensure that permeable pavement surface is free of sediment to be performed monthly.
3. Ensure that the contributing and adjacent area is stabilized and mowed, with clippings
removed to be performed as needed, based on inspection.
4. Vacuum sweep permeable pavement surface to be performed annually.
5. Inspect the surface for deterioration to be performed annually.
6. ' Verify that the permeable pavement system dewaters between storms to be performed
annually.
7. Not Applicable.
8. Substantial repairs ol'permeable pavements must be performed with permeable material
to be performed as needed, based on inspection.
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I acknowledge and agree by my signature below that I am responsible for the performance of the
eight maintenance procedures listed above.
Print name: John
Title: Manager
Address: 6800 Wrightsville Ave # 7 Wilmington, NC 28403
Phone: [phone]
Date: , 9. Z I — 200c
G
Signature:
140 .4 A a Notary Public for the State of �henL Q--&E4W &
County of ��} � ]�� _ do hereby certify that-a14-►.I Qz-u ,t - j
personally appeared before me this 4�r7 day of Sip pyres - Aapk, and
acknowledge the due execution of the forgoing permeable pavement niaintcnance requirements.
Witness my band and official seal,
REBECCA %1GREEN
!VOTARYBLIC
NEW HANOVER COUNTY, N.C.
My Commission Expires 3 3 2009
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My commission expires ` AV--r—a��� I�

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