SW8030425_CURRENT PERMIT_20030731

STORMWATER DIVISION CODING SHEET
POST -CONSTRUCTION PERMITS
PERMIT NO.
SW LMY;�5__
DOC TYPE
� CURRENT PERMIT
APPROVED PLANS
❑ HISTORICAL FILE
❑ COMPLIANCE EVALUATION INSPECTION
DOC DATE
2a3O73I
YYYYMMDD

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Mr. Neil Filippini, Managing Partner
Filippini Family Limited Partnership
P.O. Boa 10550
Wilmington, NC 28404
Dear Mr. Filippini:
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
Coleen H. Sullins, Deputy Director
Division of Water Quality
July 31, 2003
Subject: Permit No. SW8 030425
Dutch Square Storage
High Density Stormwater Project
New Hanover County
The Wilmington Regional Office received a complete Stormwater Management Permit
Application for Dutch Square Storage on July 22, 2003. Staff review of the plans and
specifications has determined that the project, as proposed, will comply with the Stormwater
Regulations set forth in Title 15A NCAC 2H.1000. We are forwarding Permit No. SW8 030425
dated July 31, 2003, for the construction of Dutch Square Storage.
This permit shall be effective from the date of issuance until July 31, 2013, and shall be subject
to the conditions and limitations as specified therein. Please pay special attention to the
Operation and Maintenance requirements in this permit. Failure to establish an adequate system
for operation and maintenance of the stormwater management system will result in future
compliance problems.
If any parts, requirements, or limitations contained in this permit are unacceptable, you have the
right to request an adjudicatory hearing upon written request within thirty (30) days following
receipt of this permit. This request must be in the form of a written petition, conforming to
Chapter i 50B of the North Carolina General Statutes, and filed with the Office of Administrative
Hearings, P.O. Drawer 27447, Raleigh, NC 27611-7447. Unless such demands are made this
permit shall be final and binding.
If you have any questions, or need additional information concerning this matter, please contact
Laurie Munn, or me at [phone].
Sincerely,
Rick Shiver
Water Quality Regional Supervisor
RSS/Asm S:IWQSISTORMWATIPERMIT1030425 ju103
cc: Charles Cazier
New Hanover County Building Inspections
Beth E. Wetherill, New Hanover County Engineering
Laurie Munn
Wilmington Regional Office
Central Files
AY
N. C. Division of Water Quality 127 Cardinal Drive Extension [phone] Customer Service AZT]
Wilmington Regional Office Wilmington, NC 28405 [phone] Fax 1 B00 623-774B NCDEN"A

State Stormwater Management Systems
Permit No. SW8 030425
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
Filippini Family Limited Partnership
Dutch Square Storage
New Hanover County
FOR THE
construction, operation and maintenance of a wet detention pond 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 July 31, 2003, and shall be subject
to the following specified conditions and limitations:
I. DESIGN STANDARDS
I . This permit is effective only with respect to the nature and volume of stormwater
described in the application and other supporting data.
2. This stormwater system has been approved for the management of stormwater runoff as
described on page 3 of this permit, the Project Data Sheet. The stormwater control has
been designed to handle the runoff from 88,661 square feet of impervious area.
3. The tract will be limited to the amount of built -upon area indicated on page 3 of this
permit, and per approved plans.
4. All stormwater collection and treatment systems must be located in either dedicated
common areas or recorded easements. The final plats for the project will be recorded
showing all such required easements; in accordance with the approved plans.
5. The runoff from all built -upon area within the permitted drainage area of this project must
be directed into the permitted stormwater control system. A permit. modification must be
submitted and approved prior to the construction of additional built -upon area from
outside of the approved drainage area.
2

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q
State Stormwater Management Systems
Permit No. SW8 030425
DIVISION OF WATER QUALITY
PROJECT DESIGN
DATA SHEET
Project Name:
Dutch Square Storage
Permit Number:
SW8 030425
Location:
New Hanover County
Applicant:
Neil Filippini, Managing Partner
Mailing Address:
Filippini Family Limited Partnership
P.O. Box 10550
Wilmington, NC 28404
Application Date:
July 22, 2003
Receiving Stream/River Basin:
Smith Creek / Cape Fear
Stream Index Number:
CPF23 l 8-74-63
Classification of Water -Body:
"C Sw"
Drainage Area, acres:
2.9
Onsite, sq. ft.:
126,455
Offsite, sq. ft.:
none, per engineer
Total Impervious Surfaces, sq. ft.:
88,661
Pond Depth, feet:
6
TSS removal efficiency:
90% (no filter is required)
Permanent Pool Elevation, FMSL:
39.0
Permitted Surface Area, sq. ft.:
8,205 @ Permanent Pool
Permitted Storage Volume, cubic ft.:
8,917
Temporary Storage Elevation, FMSL:
40.0
Controlling Orifice:
l .5" � (drawdown in 2-5 days)
Permitted Forebay Volume, cubic ft.:
5,457
3

e�
State Storrnwater Management Systems
Permit No. SWS 030425
11. 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 outlet structure, orifice device, flow spreader,
catch basins and piping.
g. Access to the outlet structure must be available at all times.
4. Records of maintenance activities must be kept and made available upon request to
authorized personnel of DWQ. The records will indicate the date, activity, name of
person performing the work and what actions were taken.
5. Decorative spray fountains will not be allowed in the stormwater treatment system.
6. 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.
7. Upon completion of construction, prior to issuance of a Certificate of Occupancy, and
prior to operation of this permitted facility, a certification must be received from an
appropriate designer for the system installed certifying that the permitted facility has been
installed in accordance with this permit, the approved plans and specifications, and other
supporting documentation. Any deviations from the approved plans and specifications
must be noted on the Certification. A modification may be required for those deviations.
8. 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.
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.
C. Further subdivision, acquisition, or sale of all or part of the project area. The
project area is defined as all property owned by the permittee, for which,
Sedimentation and Erosion Control Plan approval or a CAMA Major permit was
sought.
f. Filling in, altering, or piping of any vegetative conveyance shown on the approved
plan.
4

State Stormwater Management Systems
Permit No. SW8 030425
10. The permittee shall submit final site layout and grading plans for any permitted future
areas shown on the approved plans, prior to construction. If the proposed BUA exceeds
the amount permitted under this permit, a modification to the permit must be submitted
and approved prior to construction.
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. At least 30 days prior to the sale or lease of any portion of the property, the permittee
shall notify DWQ and provide the name, mailing address and phone number of the
purchaser or leasee. An access/maintenance easement to the stormwater facilities shall be
granted in favor of the permittee if access to the stormwater-facilities will be restricted by
the sale or lease of any portion of the property.
13. The permittee must maintain compliance with the proposed built -upon area and ensure
that the runoff from all the built -upon is directed into the permitted system.
14. The Director may notify the permittee when the permitted site does not meet one or more
of the minimum requirements of the permit. Within the time frame specified in the notice,
the permittee shall submit a written time schedule to the Director for modifying the site to
meet minimum requirements. The permittee shall provide copies of revised plans and
certification in writing to the Director that the changes have been made.
15. The permittee must maintain the current permitted drainage area. No additional runoff
from outside of the permitted drainage area boundary may enter the permitted stormwater
facilities without first applying for and receiving a permit modification.
111. GENERAL CONDITIONS
l . This permit is not transferable except after notice to and approval by the Director. In the
event of a change of owership, or a name change, the 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) which have jurisdiction.
4. In the event that the facilities fail to perform satisfactorily, including the creation of
nuisance conditions, the Permittee shall take immediate corrective action, including those
as may be required by this Division, such as the construction of additional or replacement
stormwater management systems.
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.

State Stormwater Management Systems
Permit No. SW8 030425
Unless specified elsewhere, permanent seeding requirements for the stormwater control
must folio,", the guidelines established in the North Carolina Erosion and Sediment
Control Planning and Design Manual.
Approved plans and specifications for this project are incorporated by reference and are
enforceable parts of the permit.
The permittee shall notify the Division any name, ownership or mailing address changes
within 30 days.
Permit issued this the 31 st day of July, 2003.
NORTH CAROLINA ENVIRONMENTAL MANAGEMENT COMMISSION
Alan W. Klimek, P.E., Director
`1 Division of Water Quality
By Authority of the Environmental Management Commission
0

State Stormwater Management Systems
Permit No. SW8 030425
Dutch Square Storage
Stormwater Permit No. SW8 030425
New Hanover County
Designer's Certification
as a duly registered
in the State of North Carolina, having been authorized to observe (peribdicall y/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
7

State Stormwater Management Systems
Permit No. SW8 030425
Certification Requirements:
1. The drainage area to the system contains approximately the permitted acreage.
2. The drainage area to the system contains no more than the permitted amount of
built -upon area.
3. All the built -upon area associated with the project is graded such that the runoff
drains to the system.
4. The outlet/bypass structure elevations are per the approved plan.
5. The outlet structure is located per the approved plans.
6. Trash rack is provided on the outlet/bypass structure.
7. All slopes are grassed with permanent vegetation.
8. Vegetated slopes are no steeper than 3:1.
9. The inlets are located per the approved plans and do not cause short-circuiting of
the system.
10. The permitted amounts of surface area and/or -volume have been provided.
11. Required drawdown devices are correctly sized per the approved plans.
12. All required design depths are provided.
13. All required parts of the system are provided, such as a vegetated shelf, and a
forebay.
14. The overall dimensions of the system, as shown on the approved plans, are
provided.
cc: NCDENR-DWQ Regional Office
New Hanover County Building Inspections
�3

State of North Carolina
Department of Environment and Natural Resources
Division of Water Quality
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
This form may be photocopied for use as an original
I. GENERAL INFORMATION
1. Applicants name (specify the name of the corporation, individual, etc. who owns the project):
Filippini Family Limited Partnership
2. Print Owner/Signing Official's name and title (person legally responsible for facility and compliance):
Neil Filippini, Managiny, Partner
3. Mailing Address for person listed in item 2 above:
P.Q. Box 10550 -
City: —Wilmington ^ State: NC Zip: 28404
Telephone Number: 910-799-9120
4. Project Name (subdivision, facility, or establishment name — should be consistent with project name on
plans, specifications, letters, operation and maintenance agreements, etc.):
Dutch Square Storage
5. Location of Project (street address):
Intersection of Old Dairy Road and Netherlands Drive
City: WilrninIqon County: New Hanover J
6. Directions to project (from nearest major intersection):
From the intersection of NC 17 & NC 132 travel north on NC 17 for 1.52 miles and turn left on Old Dair
Road. Site is at southwest corner of the intersection of Old Dairy Rd and Netherlands Drive.
7. Latitude : N 34" 16' 00" _ _ Longitude: W 770 49' 30" of project
8. Contact person who can answer questions about the project:
Name: Charles Cazier Telephone Number: 910-763-5100
U. PERMIT INFORMATION:
1. Specify whether project is (check one): X New Renewal Modification
Form SWU-101 Version 3.99 Pagel of4

2. If this application is being submitted as the result of a renewal or modification to an existing permit, list
The existing permit number NA 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 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.
III. PROTECT 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.
on -site wet detention pond
2. Stormwater runoff from this project drains to the Cape Fear River basin.
3. Total Project Area: 2.9 acres 4. Project Built Upon Area: 70.1 %.
5. How many drainage basins does the project have? 1
6. Complete the following information for each drainage area. If there are more than two drainage areas in the
project, attach an additional sheet with the information for each area provided in the same format as below.
Basics Information ,
Drainage Basin I
Drainage Basin 2
Receiving Stream Name
Smith Creek
Receiving Stream Class
C-SW
Drainage Basin Area
2..90 ac
Existing Impervious * Area
-
Proposed Impervious * Area
2.04 ac
% Impervious* Area (total)
70.1 %
Impervious * Surface Area
Drainage Basin 1
Drainage`Basin' 2',
On -site Buildings
46,290 sf
On -site Streets
-
On -site Parking
41,976 sf
On -site Sidewalks
395 sf
Other on -site
-
Off -site
-
Total:
88,661 sf
* Impervious 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 of

How was the off -site impervious area listed above derived? NA
IV. DEED RESTRICTIONS AND PROTECTIVE COVENANTS
The following italicized deed restrictions and protective covenants are required to be recorded for all
subdivisions, outparcels and future development prior to the sale of any lot. If lot sizes vary significantly, a
table listing each lot number, size and the allowable built -upon area for each lot must be provided as an
attachment.
The following covenants are intended to ensure ongoing compliance with state stormwater management permit
number as issued by the Division of Water Quality. These covenants nary
not be changed or deleted without the consent of the State.
2 No more than square feel of any lot shall be covered by structures of impervious materials.
Impervious materials include asphalt, gravel, concrete, brick stone, slate or similar material but do not include wood
decking or the water siaf- ace of s-winitning pools.
3. Swales shall not be filled in, piped or altered except as necessary to provide driveway crossings.
4. Built -upon area in excess of the permitted amount requires a state slormrwater management permit modification prior
to construction.
5. All permitted runofffrom outparcels or future development shall be directed into the permitted stormwater control
sy.slem. 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 ali 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 Stormwater and General Permits Unit at [phone] for
the status and availability of these forms.
Form SWU-102
Wet Detention Basin Supplement
Form SWU-103
Infiltration Basin Supplement
Form SWU-104
Low Density Supplement
Form SWU-105
Curb Outlet System Supplement
Form SWU-106
Off -Site System Supplement
Form SWU-107
Underground Infiltration Trench Supplement
Form SWU-108
Neuse River Basin Supplement
Bonn 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.
l . Please indicate that you have provided the following required information by initialing in the space
provided next to each item.
Applicant's Initials
• Original and one copy of the Stormwater Management Permit Application Form OX,
• One copy of the applicable Supplement Form(s) for each BMP _ 40r.
• Permit application processing fee of $420 (payable to NCDENR) CXX
• Detailed narrative description of stormwater treatment/man age ment_�e~----
• Two copies of plans and specifications, including: [�l�
- Development/Project name
- Engineer and firm
- Legend
- North arrow
- Scale
- Revision number and 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)
VI I. 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): Tripp Engineering P.C.
Mailing Address: 419 Chestnut Street
City: Wilmington _ State: NC Zip: 28401
Phone: [phone] Fax: [phone]
VI11. APPLICANT'S CERTIFICATION
I, U)rint or type name ofperson listed in General Information, item 2) Neil Filippini _ ,
certify that the information included on this permit application form is, to the best of my knowledge, correct and
that the project will be constructed in conformance with the approved plans, that the required deed restrictions
and protective covenants will be recorded, and that the proposed project complies with the requirements of 15A
NCAC 2H .1000.
Signature: Date: / 1�
Form SWU-101 Version 3.99 Page 4 of

Permit No. �},9b3 69 o)A
(to be provided by DWQ)
State of North Carolina
Department of Environment and Natural Resources
Division of Water Quality
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
WET DETENTION BASIN SUPPLEMENT
This form may be photocopied for use as an original
DWQ Stormwater Management Plan Review:
A complete stormwater management plan submittal includes a wet detention basin supplement for each basin,
design calculations, plans and specifications showing all basin and outlet structure details, and a signed and
notarized operation and maintenance agreement.
1. PROJECT INFORMATION (please complete the following information):
Project Name: Dutch Square Storage
Contact Person: Charles Cazier Phone Number: [phone]
For projects with multiple basins, specify which basin this worksheet applies to: _ 1
elevations
Basin Bottom Elevation 33 ft.
Permanent Pool Elevation 39 ft.
Temporary Pool Elevation 40 ft.
(floor of the basin)
(elevation of the orifice)
(elevation of the discharge structure overflow)
areas
Permanent Pool Surface Area 8,205 y sq.ft. (water surface area at the orifice elevation)
Drainage Area
Impervious Area
volumes
Permanent Pool Volume
Temporary Pool Volume
Forebay Volume
Other parameters
SA/DA'
Diameter of Orifice
Design Rainfall
Design 'TSS Removal2
2.90 ac. (on -site and off -site drainage to the basin)
2.04 ac. (on -site and off -site drainage to the basin)
25,614cu.ft. (combined volume of main basin and forebay)
8,917 cu.ft. (volume detained above the permanent pool)
5,457 cu.ft. (approximately 20% of total volume)
3.97 (surface area to drainage area ratio from DWQ table)
L5 in. (2 to-5 clay temporary pool draw -down required)
1.0 in.
90 % (minimum 85% required)
Form S W U-102 Rev 3.99 Page 1 of 4

Footnotes:
1. When using the Division SA/DA tables, the correct SAIDA ratio for permanent pool sizing should be computed based upon the
actual impervious % and permanent pool depth. Linear interpolation should be employed to determine the correct value 1'or non-
standard table entries.
2. In the 20 coastal counties, the requirement for a vegetative filter may be waived if the wet detention basin is designed to provide
90% TsS removal. The NCDENR BMP manual provides design tables for both 85% TSS removal and 90% TSS removal.
It. REQUIRED ITEMS CHECKLIST
The following checklist outlines design requirements per the Stormwater Best Management Practices Manual
(N.C. Department of Environment, Health and Natural Resources, February 1999) and Administrative Code
Section: 15 A NCAC 2H .1008.
Initial in the space provided to indicate the following design requirements have been met and supporting
documentation is attached. If the applicant has designated an agent in the Stormwater Management Permit
Application Form, the agent may initial below. If a requirement has not been met, attach justification.
Applicants Initials
G2C a. The permanent pool depth is between 3 and 6 feet (required minimum of 3 feet).
( , b. The forebay volume is approximately equal to 20% of the total basin volume.
�X c. The temporary pool controls runoff from the design storm event.
d. The temporary pool draws down in 2 to 5 days.
e. If required, a 30-foot vegetative filter is provided at the outlet (include non -erosive flow
calculations).
f. The basin length to width ratio is greater than 3:1.
g. The basin side slopes above the permanent pool are no steeper than 3:1.
�7c h. A submerged and vegetated perimeter shelf with a slope of 6:1 or less (show detail).
r7(_ i. Vegetative cover above the permanent pool elevation is specified.
CSC j. A trash rack or similar device is provided for both the overflow and orifice.
�L k. A recorded drainage easement is provided for each basin including access to nearest right-
of-way.
I. If the basin is used for sediment and erosion control during construction, clean out of the
basin is specified to be performed prior to use as a wet detention basin
4=1�_f7L m. A mechanism is specified which will drain the basin for maintenance or an emergency.
III. WET DETENTION BASIN OPERATION AND MAINTENANCE AGREEMENT
The wet detention basin system is defined as the wet detention basin, pretreatment including forebays and the
vegetated filter if one is provided.
This system (check one) ❑ does X does not incorporate a vegetated filter at the outlet.
This system (check one) ❑ does X does not incorporate pretreatment other than a forebay.
Form SWU-102 Rev 3.99 Page 2 of 4

Maintenance activities shall be performed as follows:
After every significant runoff producing rainfall event and at least monthly:
a. Inspect the wet detention system for sediment accumulation, erosion, trash accumulation,
vegetated cover, and general condition.
b. Check and clear the orifice of any obstructions such that drawdown of the temporary pool occurs
within 2 to 5 days as designed.
2. Repair eroded areas immediately, re -seed as necessary to maintain good vegetative cover, mow vegetative
cover to maintain a maximum height of six inches, and remove trash as needed.
3. Inspect and repair the collection system (i.e. catch basins, piping, swales, riprap, etc.) quarterly to
maintain proper functioning.
4. Remove accumulated sediment from the wet detention basin system semi-annually or when depth is
reduced to 75% of the original design depth (see diagram below). 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 wet detention basin or stream, etc.).
The measuring device used to determine the sediment elevation shall be such that it will give an accurate
depth reading and not readily penetrate into accumulated sediments.
When the permanent pool depth reads 4.5 feet in the main pond, the sediment shall be removed.
When the permanent pool depth reads 2.75 feet in the forebay, the sediment shall be removed.
BASIN DIAGRAM
ill in the blanks)
Permanent Pool Elevation 39
Sediment R moval El. 36.75 75 °
----- ------ Sediment Removal Elevation 34.5 75%
Bottom evation 36 %----------------------------- -- _------- ----
Bottom Elevation 33 25%
FOREBAY MAIN POND
5. Remove cattails and other indigenous wetland plants when they cover 50% of the basin surface. These
plants shall be encouraged to grow along the vegetated shelf and forebay berm.
G. If the basin must be drained for an emergency or to perform maintenance, the flushing of sediment
through the emergency drain shall be minimized to the maximum extent possible.
Form SWU-102 Rev 3.99 Page 3 of 4

7. All components of the wet detention basin system shall be maintained in good working order.
I acknowledge and agree by my signature below that I am responsible for the performance of the seven
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: Neil Filippini
Title: Managing Partner
Address: _Filippini Family Limited_ Partnership, P.O. Box 10550, Wilmington, NC 28404
Phone
Signa'
Date:
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 v��i4 L- a Notary Public for the State of North Carolina
i,�(J,y r 1 D �� Y - _ ,
County of IVeiL7 -tt�,C�DU'!` do hereby certify that Neil Filipainj E v Ll PPVq I TfL
personally appeared before me this 1} day of f2(L ) 2003 , and acknowledge the due
execution of the forgoing wet detention basin maintenance requirements. Witness my hand and official seal,
SEAL
IrA 'U a'x_��V
My commission expires {.I�LQ. zo, �"O
Form SWU-102 Rev 3,99 Page 4 of 4

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�OF W A T1 '9n Michael F. Easley, Governor
�0 G William G. Ross Jr., Secretary
CO
North Carolina Department of Environment and Natural Resources
-� Alan W. Klimek, P.E. Director
Division of Water Quality
November 7, 2006
Mr. Neil Filippini, Managing Partner DWQ FIDE COPY
Fiilppini Family Limited Partnership
PO Box 10550
Wilmington, NC 28404
Subject: Approved Plan Revision
Dutch Square Offices (formerly Dutch Square Storage)
Stormwater Project No. SW8 030425
New Hanover County
Dear M.r Filippini:
On August 17, 2006, the Wilmington Regional Office received a plan revision for Stormwater
Management Permit Number SW8 030425. The revisions include a change in the layout of the
project that results in a net decrease of proposed impervious area from 88,661 ftZ to 85,514 ft2.
It has been determined that a formal permit modification is not required for the proposed
changes. We are forwarding you an approved copy of the revised plans for your files. Please
replace the old approved plan sheets with the new ones.
Please be aware that all terms and conditions of the permit issued on July 31, 2003, remain
in full force and effect. Please also understand that the approval of this revision to the
approved plans for the subject State Stormwater Permit is done on a case -by -case basis.
Any other changes to this project must be approved through this Office prior to
construction. The issuance of this plan revision does not preclude the permittee from
complying'.with all other applicable statutes, rules, regulations or ordinances which may
have jurisdiction over the proposed activity, and obtaining a permit or approval prior to
construction.
If you have any questions concerning this matter, please do not hesitate to call me at (910)
796-7335.
Sincerely, Linda Lewis
Environmental Engineer II
ENBlarl: S:1WQSISTORMWATERIPERMIT1030425PR.nov06
cc: Charles Cazier, Tripp Engineering
Beth Wetherill, New Hanover County Engineering
City of Wilmington Development Services
Tony Roberts, New Hanover County Building Inspections
Linda Lewis
Wilmington Regional Office
Central Files
Nol-[hCrarolina
Al atura!!y
North Carolina Division of Water Quality 127 Cardinal Drive Extension Wilmington, NC 28405 ]'hone [phone] Customer Service
Wilmington Regional Office lntemer. wtit•w.nc"•aterquality.org hax [phone] 1-877-623.6748
An Equal OpportunitylAffirmative Action Employer — 50% Recycled110% Post Consumer Paper

2. If this application is being submitted as the result of a renewal or modification to an existing permit, list
The existing permit number NA and its issue date (if known)
3. Specify the type of project (check one):
Low Density X High Density Redevelop General Pernut Other
4. Additional Project Requirements (check applicable blanks):
CAMA Major X Sedimentation/Erosion Control 404//401 Permit NPDES Stormwater
Information on required state pennits 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.
on -site wet detention pond
2. Stormwater runoff from this project drains to the Cape Fear_ — R.iver basin.
3. Total Project Area: 2.9 acres
5. Flow many drainage basins does the project have? _Tl
4. Project Built Upon Area: 701 %.
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 Basin 1
Drainage Basin 2
Receiving Stream Name
Smith Creek
Receiving Stream Class
C-SW
Drainage Basin Area
2..90 ac
Existing Impervious * Area
-
Proposed Impervious * Area
1.96 ac
% Impervious* Area (total)
67.7 %
Impervious * Surface Area
Drainage Basin I
'Drainage Basin 2
On -site Buildings
30,000 sf
On -site Streets
-
Oit-site Parking
52,656 sf
On -site Sidewalks
2,858 sl'
Other on -site
-
Off -site
-
Total:
85,514 sf
�=
* Impervious area is defined as the built upon area including, but not limited to, buildings, roads, parking
areas sideivalks, gravel areas, etc.
Form SWU-101 Version 3.99 Page 2 of'4