SW8980611_Current Permit_20010326

State, of.North Carolina
Mpartment of Environment
and Natural Resources
Wilmington Regional Office
Michael F. Easley, Governor
William G. Ross, Jr., Secretary
Division of Water Quality
Mr. Mark Poston, General Manager
Therma-Tru Corporation, HMF Division
306 Old Dairy Road
Wilmington., NC 28405
Dear Mr. Poston:
AM
NCDENR
NORTH CAROUNA DEPARTMENT OF
ENVIRONMENT ANC NATURAL RESOURCES
March 26, 2001
Subject: Permit No. SW8 980611MOD
HMF NorthChase
High Density Stormwater Project
New Hanover County
The Wilmington Regional Office received a complete Stormwater Management Permit Application for HMF
NorthChase on February 13, 2001. 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 980611MOD dated March 26, 2001, for the modified construction of HMF NorthChase.
This permit shall be effective from the date of issuance until March 26, 2011, 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 Scott Vinson, or
me at [phone].
Sincerely,
rtooaZOzick -4tr
Rick Shiver
Water Quality Regional Supervisor
RSS/sav: S:IWQSISTORMWAT\PERMIT1980611.MAR
cc: Phil Tripp, P.E.
Tony Roberts, New Hanover County Inspections
Scott Vinson
Wilmington Regional Office
Central Files
127 Cardinal Dr. Ext., Wilmington, North Carolina 28405 Telephonr. 910-395-3900 FAX [phone]
An Equal Opportunity Affirmative Action Employer 50% recycled/10% post -consumer paper

State Stormwater Management Systems
Permit No. SW8 980611MOD
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
Therma.-Tru Corporation, HMF Division
HMF NorthChase
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'D 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 March 26, 2011 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 on page
3 of this permit, the Project Data Sheet. The stormwater control has been designed to handle the runoff from
194,775 square feet of impervious area.
3. Approved plans and specifications for this project are incorporated by reference and are enforceable parts
of the permit.
4. The tract will be limited to the amount of built -upon area indicated on page 3 of this permit, and per
approved plans.
The runoff from all onsite and offsite built -upon area permitted with this project must be directed into the
permitted stormwater control system.
2

State Stormwater Management Systems
Permit No. SW8 980611MOD
DIVISION OF WATER QUALITY
PROJECT DESIGN DATA SHEET
Project Naive:
HMF NorthChase
Permit Number:
SW8 980611MOD
Location:
New Hanover County
Applicant:
Mr. Mark Poston, General Manager
Mailing Address:
Therma-Tru Corporation, HMF Division
306 Old Dairy Road
Wilmington, NC 28405
Application Date:
February 13, 2001
Name of Receiving Stream/Index #:
Smith Creek / CFR 18-74-63
Classification of Water Body:
"C Sw"
If Class SA, chloride sampling results:
n/a
Pond Depth, feet:
4
Permanent Pool Elevation, FMSL:
29.50
Drainage Area, acres: 9.76
Total Impervious Surfaces, ftZ: 194,775
Offsite Area entering Pond, ftZ:
Required Surface Area, ftZ:
Provided Surface Area, ftZ:
Required Storage Volume, ft3:
Provided Storage Volume, ft3:
Temporary Storage Elevation, FMSL:
Controlling Orifice:
none, per Engineer
16,857
21,165
16,380
22,654
30.50
2.50"� pipe
3

State Stormwater Management Systems
Permit No. SW8 980611MOD
II. SCHEDULE OF COMPLIANCE
1. The stormwater management system shall be constructed in it's entirety, vegetated and operational for its
intended use prior to the construction of any built -upon surface.
2. 11wring 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 side slopes.
d. Immediate repair of eroded areas.
e. Maintenance of side slopes in accordance with approved plans and specifications.
f. Debris removal and unclogging of outlet structure, orifice device and 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.
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. A modification must be permitted prior to any construction. The following items will require a modification
to the permit. The Director may detennine that other revisions to the project should require a modification
to the permit:
a. Any revision to the approved plans, regardless of size.
b. Project name change.
C. Transfer of ownership.
d. Redesign or addition to the approved amount of built -upon area.
e. Further subdivision, acquisition, or sale ofthe project area. The project area is defined as all property
owned by the permittee, for which Sedimentation and Erosion Control Plan approval was sought.
f. Filling in, altering, or piping of any vegetative conveyance shown on the approved plan.
10. A copy of the approved plans and specifications shall be maintained on file by the Permittee for a minimum
of ten years from the date of the completion of construction.
El

State Stormwater Management Systems
Permit No. SW8 980611MOD
11. 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 pemitted amount, a modification
to the permit must be submitted and approved prior to construction.
12. Prior to the sale of any portion of the property, 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
of any portion of the property.
13. The permittee is responsible for verifying that the proposed built -upon area does not exceed the allowable
built -upon area.
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 shall notify the Division of any name, ownership or mailing address changes within 30 days.
I1I. GENERAL CONDITIONS
This permit is not transferable. In the event there is a desire for the facilities to change ownership, or there
is a name change of the Permittee, a formal permit request must be submitted to the Division of Water
Quality accompanied by an application fee, 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.
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 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.
Permit issued this the 26th day of March, 2001
NORM CAROLINA ENVIRONMENTAL MANAGEMENT COMMISSION
Kerr T.-Stevens, Director
Division of Water Quality
By Authority of the Environmental Management Commission
Permit Number SW8 980611MOD

State of North Carolina
Department of Environment and Natural Resources
Division of Water Quaiity
STORVIWATER MANAGEMENT PERMIT APPLICATION FORM
This form may be photocopied for use as an original
I. GENERAL INFORMATION
Applicants name (specify the name of the corporation, individual, etc. who owns the project):
Therma-Tru Co oration HME Division
2. Print Owner/Signing 1. Official's name and title (person legally responsible for facility and compliance):
Mark Poston General Man er
3. Mailing Address for person listed in item 2 above:
306 Old D ' Road
City: Wihnington State: NC Zip: 28405
Telephone Number: 910-452-1845
4. Project Name (subdivision, facility, or establishment name — should be consistent with project name on
plans, specifications, letters, operation and maintenance agreements, etc.):
HMF Northchase
5. Location of Project (street address):
2510 Northchase Parkway S.E.
City: MwMinaton County: New Hanover
6. Directions to project (from nearest major intersection):
Approximately % mile from the intersection of NC 132 and Southeast Northchase Parkwa 4
7. Latitude : N 340 18' 20" Longitude: W 77' 52' 06" of project
8. Contact person who can answer questions about the project:
Namc: I'hillipo T elephone Number: 910-763-5100
II. PERMIT INFORMATION:
1. Specify whether project is (check one): _ New Renewal X Modification
Form SVVU-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 SW8 980611 and its issue date (if known) 9/11/98
3. Specify the type of project (check one):
Low Density X High Density Redevelop General Permit
4. Additional Project Requirements (check applicable blanks):
CAMA Major X Sedimentation/]Erosion Control 404//401 Permit
Other
NPDES Stormwater
Information on required state permits can be obtained by contacting the Customer Service Center at
1-977-623-6748. p E C E I V E
M. PROJECT WOnMTION FEB t, 3 ZAl
1. In the space provided below, summarize how stormwater will be treated. AMM fled narrative
(one to two pages) describing stormwater .management for the project.
_ tormwater runoff will be treated in a wet detention pond designed to achieve 90% TSS removal
2.
Stormwater runoff from this
project drains to the
Cipe
Fear River basin.
3.
Total Project Area: 9.76
acres
4.
Project Built Upon Area: 45.8 %.
5. Flow many drainage basins does the project have? 1
6. Complete the following information for each drainage area. Ifthere 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.
1_ ,
.2
Receiving Stream Name
Unnamed trib to Smith Creek
Receiving Stream Class
C-SW
Drainage Basin Area
9.76 ac
Existing Impervious * Area
1.79 ac
Proposed Impervious * Area
2.68 ac
% impervious* Area (total)
45.8 %
- * , Ar
2.:
On -site Buildings (existing bldg)
75,000 sf
On -site Streets
On -site Parking (pmosed)
59,888 sf
On -site Sidewalks
10,908 sf
Mer on -site (ama'ete atomse, acme)
48,979 sf
Off -site
Total:
1=194,775 sf / 4.47 ac_
* Impervious area is defined as the built upon area including, but not limited to, buildings, roads, parking
areas sidewalks, gravel areas, etc.
Form QWTT_1A1 varcinn Z 00 WonP 7 nfA

7. 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.
1. The following covenants are intended to ensure ongoing compliance with state stormwater management permit
number NA as issued by the Division of rater Quality. These covenants may
not be changed or deleted without the consent of the State.
2. No more than NA square feet ofany 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 surface of swimming pools.
3. Swales shall not be filled in, piped or altered except as necessary to provide driveway crossings.
4. Built -upon area in excess of the permitted amount requires a state stormwater management permit modification prior
to construction.
S. All permitted runoffrom outparcels or future development shall be directed into the permitted stormwater control
system. These connections to the stormwater control system shall be performed in a manner that maintains the
integrity and performance of the system as permitted
By your signature below, you certify that the recorded deed restrictions and protective covenants for this project
shall include all the applicable items required above, that the covenants will be binding on all parties and
persons claiming under them, that they will run with the land, that the required covenants cannot be changed or
deleted without concurrence from the State, and that they will be recorded prior to the sale of any lot.
V. SUPPLEMENT FORMS
The applicable state stormwater management permit supplement form(s) 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 SW-102
Form SWU-103
Form SWU-104
Form SWU-105
Form SWU-106
Form SWU-107
Form SWU-109
Form SWU-109
Wet Detention Basin Supplement
Infiltration Basin Supplement
Low Density Supplement
Curb Outlet System Supplement
Off -Site System Supplement
Underground Infiltrattion Trench Supplement
Neuse River Basin Supplement
Innovative Best Management Practice Supplement
Form SWU-101 Version 3.99 Page 3 of 4

VI. SUBMITTAL REQUIREMENTS
Only complete application packages will be accepted and reviewed by the Division of Water Quality (DWQ).
A complete package includes all of the items listed below. The complete application package should be
submitted to the appropriate DWQ Regional Office.
1. Please indicate that you have provided the following required information by initialing in the space
provided next to each item.
• Original and one copy of the Stormwater Management Permit Application Form
• One copy of the applicable Supplement Form(s) for each BMP
• Permit application processing fee of $420 (payable to NCDENR)
• Detailed narrative description of stormwater treatment/management
• Two copies of plans and specifications, including:
- Developmenu-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)
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): Trip_ ineerin , P.C.
Mailing Address: 419 Chestnut Street
City: Wilmington State: _ NC Zip: 28401
Phone: [phone]
VIII. APPLICANT'S CERTIFICATION
Fax: [phone]
I, (print or type name ofperson listed in General Information, item 2) Mark Poston
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: A- 6 `�
Form SWt;-101 Version 3.99 Page 4 of 4

Permit No. SW8 980611 mod
(to be provided by DWQ)
State of North Carolina
Department of Environment and Natural Resources
Division of Water Quality
STOR[v[WATER :MANAGEMENT PERMIT APPLICATION FORM
WET DETENTION BASIN SUPPLEMENT
This form may be photocopied for use as can original
DM 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.
L PROJECT INFORMATION (please complete the following information):
Project Name: IiMF Northbase
Contact Person: Mark Poston Phone Number: 910 ) 452-1845
For projects with multiple basins, specify which basin this worksheet applies to: 1
elevations
Basin Bottom Elevation 25.50 ft.
Permanent Pool Elevation 29.50 ft.
Temporary Pool Elevation �0_ 5aft.
areas
Permanent Pool Surface Area 21.165 sq.ft.
Drainage Area 9.76 ac.
Impervious Area 4.47 ac.
volumes
RECEIVE
(floor of the basin) FEB J 3 2001
A ,, )
(elevation of the orifice) PROS! # DW�,
(elevation of the discharge structure ove ow
(water surface area at the orifice elevation)
(on -site and off -site drainage to the basin)
(on -site and off -site drainage to the basin)
Permanent Pool Volume 54.537 cu.ft. (combined volume of main basin and forebay)
Temporary Pool Volume 22,635 cu.ft. (volume detained above the permanent pool)
Forebay Volume #1 5.845�_ cu.ft. (approximately 20% of total volume)
#2 3,771
Other parameters
SA/DA' 3.98 (surface area to drainage area ratio from DWQ table)
Diameter of Orifice 2.5 in. (2 to 5 day temporary pool draw -down required)
Design Rainfall 1.0 in.
Design TSS Remova? 90 % (minimum 85%required)

Footnotes:
1. When using the Division SA/DA tables, the correct SA/DA 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 for 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.
U. 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
/6" a. The permanent pool depth is between 3 and 6 feet (required minimum of 3 feet).
%LET b. The forebay volume is approximately equal to 20% of the total basin volume.
xa-.'P c. The temporary pool controls runoff from the design storm event.
,6a d. The temporary pool draws down in 2 to 5 days.
4 as n e. If required, a 30-foot vegetative filter is provided at the outlet (include non -erosive flow
calculations).
e'C'-P f. The basin length to width ratio is greater than 3: 1,
A g. The basin side slopes above the permanent pool are no steeper than 3: 1.
Z'a'P h. A submerged and vegetated perimeter shelf with a slope of 6:1 or less (show detail).
i. Vegetative cover above the permanent pool elevation is specified.
A!W j. A trash rack or similar device is provided for both the overflow and orifice.
, 4P k. A recorded drainage easement is provided for each basin including access to nearest right-
of-way.
,rai%P 1. 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
/. Cc 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.
T his 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 3.0 feet in the main pond, the sediment shall be removed.
When the permanent pool depth reads 3.0 feet in the forebay, the sediment shall be removed.
BASIN DIAGRAM
(fill in the blca h s)
Permanent Pool Elevation 29.50
It
Sedimentom oval El. 26.5 7S o
-------------- - Sediment Removal Elevation 2 .5.75%
Bottevation ^ 25.5 %--------------------------------------------------
Bottom Elevation 25.5 25%
FOREBAY MAIN POND
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.
6. 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.

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: Mark Poston
Title: General Manager
Address: Therma-Tru Corp HNO Division, 306 Old DaiKy Road Wilmington, NC 28405
Phone
Signatu
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, Q jQ/',g, e. Will CO X , a Notary Public for the State of /YOLM 00taiiga-
County of N,Qy)' /&aycr , do hereby certify that Jb/ajj� &p JM
personally appeared before me this &¢h day of jgeMbe ' 2000 and acknowledge the due
execution of the forgoing wet detention basin maintenance requirements. Witness my hand and official seal,
SEAL
My commission expires 8 1 17-aOs
Form SWU-102 Rev 3.99 Page 4 of 4