SW8931105_Historical File_19980914

+State"of North Carolina
Department of Environment
and Natural Resources
Wilmington Regional Office
James B. Hunt, Jr., Governor
Wayne McDevitt, Secretary
Division of Water Quality
Mr. Maurice S. Emmart, Jr., General Partner
Greenbriar South Partnership
99 Aqua Vista Drive
Wilmington, NC 28409
Dear Mr. Emmart:
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0
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NCDEN R
MOL
NORTH CAROLINA DEPARTMENT OF
ENVIRONMENT AND NATURAL RESOURCES
September 14, 1998
Subject: Permit No. SW8 931105 Modification
Greenbriar South
High Density Subdivision Stonnwater Project
New Hanover County
The Wilmington Regional Office received the Stormwater Management Permit Application for Greenbriar South on May 26,
1998, with final information on July 10, 1998. 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 931105 Modification, dated September 14, 1998, for the construction of the project. Greenbriar Srn,rh
This permit shall be effective from the date of issuance until September 14, 2008, 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 Linda Lewis, or me at (910)
395-3900.
Sincerely,
Rick Shiver
Water Quality Regional Supervisor
RSS/arl: S:\WQS\STORMWAT\PERMIT1931105.SEP
cc: Mark Hargrove, P.E.
Tony Roberts, New Hanover County Inspections
Beth Easley, New Hanover County Engineering
Linda Lewis
Wilmington Regional Office
Central Files
127 Cardinal Dr. Ext., Wilmington, North Carolina 28405 Telephone [phone] FAX [phone]
An,Equal Opportunity Affirmative Action Employer 50% recycled/10% post -consumer paper

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State Stormwater Management Systems .
Permit No. SW8 931 105 Modification
0
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
Greenbriar South Partnership
Greenbriar South
New Hanover County
FOR THE
construction, operation and maintenance of 2 detention ponds and a curb outlet system in compliance with the
provisions of 15A NCAC 2H .1000 (hereafter referred to as the "stormwater rules') and the approved stormwater
management plans and specifications and other supporting data as attached and on file with and approved by the
Division of Water Quality and considered a part of this permit.
This permit shall be effective from the date of issuance until September 14, 2008 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 subdivision is permitted for 150 lots, each limited to a
maximum built -upon area as follows: Lots 1-19 @5,775 ft2; Lots 20-40 @4,900 ft2; Lots 41-65, 89-100,
116-120, and 137-141 @3,200 ft2; and Lots 66-88, 101-115, 121-136, and 142-150 @3,500 ft2.
3. Approved plans and specifications for this project are incorporated_by-reference and are enforceable. -parts
of the =pdrmif - - -
2

State Stormwater Management Systems
Permit No. SW8 931105 Modification
DIVISION OF WATER QUALITY
PROJECT DATA SHEET
Project Name:
Permit Number:
Location:
Applicant:
Mailing Address:
Application Date:
Water Body Receiving Stormwater Runoff:
Classification of Water Body:
Pond Depth, feet:
Permanent Pool Elevation, FMSL:
Total Impervious Surfaces, ft2:
* # /3500
* # /3200
* # /4900
Roads/Parking, 112
Offsite @35%, ft2
Pool/Recreation Area
Offsite Area entering Pond, ft2:
Required Surface Area, ft2:
Provided Surface Area, ft2:
Required Storage Volume, ft3:
Greenbriar South
931105 Modification
New Hanover County
Mr. Maurice S. Emmart, Jr., General Partner
Greenbriar South Partnership
99 Aqua Vista Drive
Wilmington, NC 28409
May 26, 1998
Mott Creek
licit
EXISTING
POND 1 POND 2
7.5 4
19 21.5
767,039 142,375
59.5/208,250 3.5/12,250
28/89,600 19/60,800
0 1 /4900
178,499 42,725
227,165 0
0 21,700
14.9 acres @35% n/a
* # of lots/BUA per lot
20,743
12,549
23,655
16,396
66,979
12,288
Provided Storage Volume, ft3: 94,325 12,783

State Stormwater Management Systems
Permit No. SW8 931105 Modification
4. No homeowner/lot owner/developer shall fill in, alter, or pipe any drainage feature (such as swales) shown
on the approved plans as part of the stormwater management system without submitting a revision to the
permit and receiving approval from the Division. No piping shall be allowed in a curb outlet system swale.
v
5. A portion of this project proposes a curb outlet system, located between Lots 3 & 4, 36 and 37, and beside
40. Each designated curb outlet swale shown on the approved plan is required to be 100' long with side
slopes no steeper than 5:1 (H: V), have a longitudinal slope no steeper than 5 % , carry the flow from a
10 year storm in a non -erosive manner, and have a dense vegetated cover, per Section .1008 (g) of the
stormwater rules. Other vegetated conveyances must have a minimum side slope of 3:1.
6. The permittee is responsible for verifying that the proposed built -upon area does not exceed the allowable
built -upon area. Once the lot transfer is complete, the built -upon area may not be revised without approval
from the Division of Water Quality, and responsibility for meeting the built -upon area limit is transferred
to the individual property owner.
7. The following items will 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 of the project area.
Filling in, altering, or piping of any vegetative conveyance shown on the approved plan.
In addition, the Director may determine that other revisions to the project should require a modification
to the permit.
8. 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.
II. SCHEDULE OF COMPLIANCE
1. The stormwater management system, including ponds, swales, and curb outlet system, shall be
constructed in it's entirety, vegetated and operational for its intended use prior to the construction of any
built -upon surface except roads.
2. --During construction, erosion -shall be kept:to a --minimum and any eroded areas of the'system will be
repaired immediately.
n

State Stormwater Management Systems
Permit No. SW8 931105 Modification
5. 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.
6. 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.
7. Records of maintenance activities must be kept and made availablc 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.
8. Prior to the sale of any lot, deed restrictions must be recorded which limit the built -upon area per lot to
the amount as shown on the Project Data Sheet, per Section I, Part 2. The recorded statements must
follow the form:
a. "The maximum built -upon area per lot is as follows: Lots 1-19 @5,775 ft2; Lots 20-40 @4,900
ftz; Lots 41-65, 89-100, 116-120, and 137-141 @3,200 ft2; and Lots 66-88, 101-115, 121-136,
and 142-150 @3,500 ft2, inclusive of that portion of the right-of-way between the lot line and the
edge of pavement, structures, pavement, walkways of brick, stone, or slate, but not including open
wood decking or the water surface of swimming pools. "
b. "The covenants pertaining to stormwater regulations may not be changed or deleted without
concurrence of the State. "
C. "Alteration of the drainage as shown on the approved plan may not take place without the
concurrence of the State. "
d. "A11- runoff_ on=the lot must -drain -Into ;the permitted s stem:: This: ma :
y y be accomplished through
providing roof drain gutters which drain to the street, grading the lot to drain toward the street,
or grading perimeter swales and directing them into the pond or street. Lots that naturally drain
into the system are not required to provide these measures."
9.- _._.._A copy. of. the-recorded_-deedxestrictions_must::be�ubmitted.-to-xhe ivision vithini30 days':of the dafe of
- - _
recording the plat, and prior to selling any lots. The recorded c- opy must be signed and dated by the
Pernuttee, _and bear the -official deedbook.number and.:page stamp: -
5

State Stormwater Management Systems
Permit No. SW8 931 105 Modification
10. '1'his shall become voidable unless the facilities are constructed in accordance with the conditions
6 permit, the approved plans and specifications, and other supporting data.
v
1L Prior to transfer of ownership, the pond must be inspected by DWQ personnel, and determined to be in
compliance with all permit conditions. Records of maintenance activities will be required.
12. 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.
III. GENERAL CONDITIONS
1. 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 Perminee, a "Name/Ownership Change Form" must be submitted to the
Division of Water Quality accompanied by appropriate documentation from the parties involved, such as
a copy of the deed of trust. Other supporting materials, such as a signed Operation and Maintenance plan
in the case of engineered systems, will also be required. The project must be in good standing with
DWQ. 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 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.
6. Permittee grants permission to staff of the DWQ to access the property for the purposes of inspecting the
stormwater facilities during normal business hours.
Permit issued this the 14th day of September, 1998.
NORTH CAROLINA ENVIRONMENTAL MANAGEMENT COMMISSION
1 rim .t r -A-4 / a--� M --I A O 2"'1
A. Preston Howard, Jr., P.E., Director
Division of Water Quality
,BX.Authgrity of ,the. Environmental ;Management Commission -
- --.Permit Number SWS-931105 Modification_.. ,- - -
6 ---

State Stormwater Management Systems
Permit No. SW8 931 105 Modification
Greenbriar South
Stormwater Permit No. SW8 931105 Modification
New Hanover County
Engineer's Certification
I, , as a duly registered Professional Engineer 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.
Noted deviations from approved plans and specifications:
SEAL
Signature
Registration Number
Date

STORMWATER OPERATION AND MAINTENANCE PLAN
FOR I UhMWATER
GREENBRIAR SOUTH E C E! V E
WILMINGTON, NORTH CAROLINA MAY 2 61998
D
PROJ # sw% I � ?� QO
1. The owner will be responsible for the proper operation and maintenance of the
stormwater collection and treatment facilities.
2. The collection system will be inspected monthly by the owner to identify
malfunctioning catch basins and drainage pipes. The collection system will be kept
relatively clear of debris and sediment. The stormwater system shall be kept in good
working order. Any malfunctioning component shall be repaired/replaced per approved
plans as necessary to assure proper operation of the system.
3. The treatment facilities consist of two (2) stormwater ponds with outlet control. 2r x e curb cuf Lef
These facilities will be inspected twice a year by the owner to determine the mean depth of Sew
the ponds and identify any malfunctions. The mean depth of Pond No.1 (existing pond)
under normal conditions, shall be 7.5 feet. The owner will remove the sediment from the
pond if the mean depth is determined to be less than 5.2 feet and will correct malfunctions
when necessary. The mean depth of Pond No.2 (new pond) under normal conditions
shall be 4.0 feet. The owner will remove the sediment from the pond if the mean depth is
determined to be less than. 3.0 f et and will gorrect malfunctions when necessary. Jam' n d
GirC0M5fv47ce5 r-'- h2. cvdh be te55 Shari 3'
4. The outlet structure, orifice, and sidesteps will be inspected immediately after every
runoff producing rainfall event. Any debris observed on the orifice and outlet structures
will be removed. Eroded areas will be repaired and reseeded immediately after a rainfall
event.
5. A permanent stand of grass shall be maintained at all times. Mowing during the
growing season will be done as needed, otherwise, the grass height will not exceed 6"
6. The grass swells shall be inspected twice a year by the owner to determine if sediment
has accumulated in the swale and to determine if any erosion has occurred. Mowing will
be accomplished as needed according to the season. Grass height will not exceed 6" at
any time. Swales will be inspected monthly or after every runoff rainfall event for
sediment build-up, erosion and trash accumulation. Accumulated sediment and *rash tkrill
be removed as necessary. Swales will be reseeded or sodded following sediment removal.
Eroded areas of the swales will be repaired and reseeded. Swales will be revegetated as
needed based on the monthly inspections. Catch basins, curb cuts, velocity reduction
PAGE 1 OF 2

STATE OF MAXIMUM IMPERVIOUS SURFACE AREA FOR GREENBRIAR SOUTH
No more than 3,200 square feet for lots 41 through 65, 89 through 100, 116 through
120, and 137 through 14i, and 3,500 square feet for lots 66 through 88, 101 through
1152 121 through 136, and 142 through 150, including that portion of the right-of-
way between the edge of pavement and the front lot line, shall be covered by
impervious structures including asphalt, gravel, concrete, brick, stone, slate or similar
material but not including wood decking or the surface of swimming pools. This
covenant is intended to insure continued compliance with the stormwater permit
issued by the State of North Carolina. The covenant may not be changed or deleted
without the consent of the State.
STORMWATER
D E C E I V E
AP D R 0 91998
PROJ # 05

State of North Carolina
Department of Environment and Natural Resources
Division of Water Quality
STCZRMWATER MANAGEMENT PERMIT APPLIC:AUION 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):
Greenbriar South -Partnership
2. Print Owner/Signing Official's name and title (the person who is legally responsible for the facility and
its compliance):
3. Mailing Address for person listed in item 2 above:
99 Aqua Vista. Drive
may: Wi]mincxton State-'.* NC .Zip: 28409
Telephone Number ( 910 ) '791-1711
4. Project Name (subdivision, facility, or establishment name -should be consistent with project name on
plans, specifications, letters, operation and maintenance agreements, etc.): .
Greenbriar South
5. Loon :bf Facility (street address):
..Located between Greenbriar Subdivision off NC 119 and Rar!Fnn fmka
C.itjr TeTilmi nai-rm Cotaltj�' New HanrnTr�r
6. Directions to facility (from nearest major intersection):
± ' mile north of intersection of NC 13.2 and Carolina Beach Prod
7. Latitude`' 340 08' 30" Longitude 77° 52' 45" of facility
8. Contact person who can answer questions about the facility:
Nam Maurice 5. 1~�tanart , Jr. Telephone Number: (gtp ) 791-1713
II. PERMIT INFORMATION:
1. Specify whether project is (check one): New Renewal -modification
2. If this application is being submitted as the result of a renewal or modification to an existing permit, list
the existingpern- tnumber 931105 and its issue date (if known)December 20. 1993
Form SWU-101 Januan, 1998 Page 1 of 4

3. Specify the type of project (check one):
Low Density X High Density Redevelop
General Permit Other
a
4. Additional Project Requirements (check applicable blanks):
CAMA Major X Sedimentation/Erosion Control 404 Permit
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.
Stormwater will be treated with the use of two stormwater ponds sized to achieve
a 90% reduction in total suspended s li
2. Stormwater runoff from this project drains to the Cape Fear River basin.
3: Total Project Area: Gc' •2 acres
5. How many drainage basins does the project have? 3
4. Project Butt Upon Area'-39 • -" %
6. Complete the following information for each drainage basin. If there are more than two drainage basins in
the project, attach an additional sheet with the information for each basin provided in the same format as
below. I . I I a I 3
�o
On -site
Stream Name
Stream Class
Basin Area
a envious" Area
xa ervious*Area
ions" Area (total)
Streets
trib. to JUnnamed trib. to
52.07 1 8. ts,l: ac
-n_ 1 -0-
..a = ; V ..,....;.
178
N/A
Other on -site N/A
Off -site .165
Total: J £_ 746,039 sf=17.13 ac =1
" Impervious area is defined as the built upon area inch
areas, sidewalks, gravel areas, etc.
A
Unnamed trib. to
sf= 3.27 ac 1-189 938 sf= 4.- ��rJ
iut not limited to, butldtngs, roads, parking
7. How was the off -site impervious area listed above derived?-----.:--------.
prwic us pa mt irr1uded 14.9 acres CE cffsite area clr nirig to =rd @ 35%
JLMOEMCUS
IV. DEED RESTRICTIONS AND PROTECTIVE COVENANTS
cts
Deed restrictions and protective covenants are required ttachment A recorded
speciffor all ic density items that must ben orded.
all
subdivisions prior to the sale of any lot. Please see
Form SVJTJ-101 January 1998 Page 2 of 4

By your signature below, you certify that the recorded deed restrictions and protective covenants for this project
shall include all the items required by the permit, 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.
VI. AGENT AUTHORIZATION
If you wish to designate submittal authority to another individual or firm so that they may provide
information on your behalf, please complete this section:
Designated agent (individual or firm): W.K. Dickson & Company, Inc.
MailngAddtess: 3177 Wrightsville Avenue
Wilmington
State: N.C. Zip: 28403
Phone:( 910 ) 762-4200
VII. SUBMITTAL REQUIREMENTS
Fax:( c)i 0-?762-4201
This application package will not be accepted by the Division of Water Quality unless all of the applicable
items are included with the submittal.
1. Please indicate that you have provided the following required information by signing your initials in the
space provided next to each item.
Applicant's Initials
• Original and one copy of the Stormwater Management Permit Application Form .i9NIJ
• One copy of the applicable Supplement Form(s) for each BMP (see Attachment A)
• Permit application processing fee (see Attachment A) /!7N
• Two copies of plans and specifications including: N
• Detailed narrative description of stormwater treatment/management
• Two copies of plans and specifications, including: �► N
- 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, parking, cul-de-sacs, sidewalks, and curb and gutter
- Wetlands delineated, or a note on plans that none exist
- Existing drainage (including off -site), drainage easements, pipe sizes, runoff calculations
- Drainage basins delineated
- Vegetated buffers (where required)
V. APPLICANT'S CERTIFICATION
I, (print or type name of person listed in General Information, item 2) Maurice S . Emira-rt ,_ ar -
certify that the information included on this permit application form is correct, that the project will be
constructed in conformance with the approved plans, that the deed restrictions in accordance with Attachment
A of this form will be recorded with all required permit conditions, and that to the best of my knowledge the
proposed project complies with the requirements of 15A NCAC 2H .1000.
Form SWU-101 January 1998 Page 3 of 4

Permit No.
(to be provided by DWQ)
State of North Carolina
Department of Environment and Natural Resources
Division of Water Quality
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
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 fully executed
operation and maintenance agreement.
1. PROJECT INFORMATION (please complete the following information):
Project Name:
Greenbriar South
Contact Person: Mark N- Hargrove, P.E. Phone Number: ( 910 ) 76 _-4 00
For projects with multiple basins, specify which basin this worksheet applies to: Pond #2
Basin Bottom Elevation
17.50 ft.
(average elevation of the floor of the basin)
Permanent Pool Elevation 21.50 ft. (elevation of the orifice)
Temporary Pool Elevation 22.25 ft. (elevation of the discharge structure overflow)
Permanent Pool Surface Area 16,396 sq. ft. (water surface area at the orifice elevation)
Drainage Area
Impervious Area
Permanent Pool Volume
Temporary Pool Volume
Forebay Volume
SA/DA1 used
8.87 ac. (on -site and off -site drainage to the basin)
3.24 ac. (on -site and off -site drainage to the basin)
43.8U_ cu. ft. (combined volume of main basin and forebay)
12.781 cu. ft. (volume detained above the permanent pool)
2,441 cu. ft.
3.10
Diameter of Orifice 2 in.
Design TSS Removal 90
II. REQUIRED ITEMS CHECKLIST
(surface area to drainage area ratio)
(85% TSS removal required, see item k below)
The following checklist outlines design requirements per the Stormwater Best Management Practices manual
(N.C. Department of Environment, Health and Natural Resources, November 1995) and Administrative Code
Section: 15 A NCAC_'. 2H .1008.
Initial in the space provided to indicate 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.
Form SWU-102 January 1998 Page 1 of 2

Applicants Initials
ArN9 a. The temporary pool controls runoff from the 1 inch storm event.
IJ1Nf� b. The basin length to width ratio is greater than 3: 1.
Z?AM c. The basin side slopes above the permanent pool are no steeper than 3:1.
/npj,7 d. A submerged and vegetated perimeter shelf at less than 6:1 is provided (show detail).
Owd e. Vegetation above the permanent pool elevation is specified.
NO
f. An emergency drain is provided to empty the basin. (Pon d w. 0 b-- ?vmp e r/ : ( Mece_44aryI
CNN g. The permanent pool depth is between 3 and 6 feet (required minimum of 3 feet).
/n N/1 h. The temporary pool draws down in 2 to 5 days.
ANC i. A trash rack is provided for both the overflow and orifice.
/0N# j. The forebay volume is approximately equal to 20% of the total basin volume.
mNii k. Sediment storage is provided in the permanent pool.
AIJA 1. A 30-foot vegetative filter is provided at the outletz (include erosive flow calculations)
1�1 N1� m. Recorded drainage easement for each basin including access to nearest right-of-way.
I7 NO n. A site specific operation and maintenance (O&M) plan is provided.
ANX o. A vegetation management/mowing schedule is provided in the O&M plan.
/")V l' p. Semi-annual inspections are specified in the O&M plan.
/"IV# q. A debris check to be performed after every storm event is specified in the O&M plan.
mod r. Specific clean -out benchmarks are specified in the O&M plan (elevation or depth).
A&& s. A legally responsible parry is designated in the O&M plan3 (include name and title).
NNE t. 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.
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 The requirement for a vegetative filter may be waived if the wet detention basin is designed to meet 90% TSS removal. .
3 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.
Form SWU-102 January 1998 Page 2 of 2

Greenbriar Subdivision
Stormwater Project No. 931105
New Hanover County
Engineer's Certification
I, Pwmw Ap2E v —ryw , as a duly registered Professional Engineer in the State
of North Carolina, having been authorized to observe (periodically the construction of
the project,
(eject)
for MAyme !!�. Eonaer . TQ. (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.
Signature 7
OSl H
Registration Number 1' :S-74
$E
Date • Id ' `'1$ s 179
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WK
DICKSON
July 10, 1998
Ms. Linda Lewis
N.C. Department of Environment,
MOM -
Health, and Natural Resources
Division of Water Quality Section
Engineers 127 Cardinal Drive Extension
Planners Wilmington, NC 28405
Surveyors
Re: Greenbriar South Subdivision
New Hanover County
Project No. W9701.80
NCDWQ Project No. 931105
Dear Ms. Lewis:
In response to your letter dated July 1, 1998, the following is provided:
1) A thins column has been added to page 2 of 4 listing the statistics for the curb outlet
system area. These numbers demonstrate compliance with the low density option for
this section.
2) The inlet and outlet elevations of the swales have been previously provided on Sheet
C-1.
3) A vegetative filter detail has been added to sheet C-16 to be used as a flow spreader
mechanism.
Enclosed please find the following items:
- the revised stormwater application for the referenced project. A third column has
been added to page 2 of 4.
- two copies of the following sheets
C-16 MISCELLANEOUS DETAILS, dated 4/3/98, revised 7/9/98
If you need additional information please feel free to call.
Very truly yours,
WK DICKSON & CO., INC.
Mark N. Hargrove, P.E.
Encl.: As noted above.
cc: Greenbdar South Partnership
3177 Wrightsville Avenue Other Offices: Atlanta, GA Hickory, NC
Wilmington, North Carolina 28403 Asheville, NC Raleigh, NC
910.762.4200 Charlotte, NC Columbia, SC
Fax [phone]
www.wkdickson.com

From: "Mark N. Hargrove, PE" <[e-mail]>
To: "Linda Lewis" <N1 [e-mail]>
Subject: Greenbriar South Subdivision
Date sent: Mon, a Jul 1998 09:09:59 -0400
Linda,
I received your letter about Greenbriar. For item No. 2, 1 had
previously provided a table on the right side of Sheet C-1, dated
3/25!98 and revised c b 5l22/9Q,mIV ±h grass sv:uic Ili fvi; ;aiiv'i. T"e
table had lengths, invert in, invert out, and slope for each of the
three swales. I was wondering if you happened to overlook this? Also,
you mentioned in your letter that you enclosed a vegetated filter
detail. One was not attached with your letter. You can fax me a copy
of the detail at 762-4201.
Linda, I was also wondering if there was any way we could get the
permit applications on a computer file such as Microsoft Word, it
would make it much easier to complete the applications.
Thanks....
Mark Hargrove
Alida Lewis -- 1 -- Wed, 8 Jul 1998 08:10:12

State of North Carolina
Department of Environment
and Natural Resources
Wilmington Regional Office
James B. Hunt, Jr., Governor
Wayne McDevitt, Secretary
Division of Water Quality
July 1, 1998
Mr. Mark Hargrove, P.E.
W.K. Dickson
3177 Wrightsville Avenue
Wilmington, NC 28403
NCDENR
NORTH CAROLINA DEPARTMENT OF
ENVIRONMENT AND NATURAL RESOURCES
Subject: ACKNOWLEDGEMENT OF RECEIPT AND
REQUEST FOR ADDITIONAL INFORMATION
Stormwater Project No. SW8 931105 Modification
Greenbriar Subdivision
New Hanover County
Dear Mr. Hargrove:
The Wilmington Regional Office received previously requested information for the Stormwater Management
Permit Application for Greenbriar Subdivision on May 26, 1998. A preliminary review of that information has
determined that the application is not complete. The following information is needed to continue the stormwater
review:
1. Please add a third column to the application listing the statistics for the curb outlet system area,
demonstrating compliance with the low density option for that section. Feel free to redraw lines as
needed to add this column.
2. The inlet and outlet elevations of the swales have not been provided.
3. A Flared End Section does not qualify as a flow spreader mechanism. Please see the enclosed
vegetated filter detail for an appropriate flow spreader mechanism.
Please note that this request for additional information is in response to a preliminary review. The requested
information should be received by this Office prior to August 1, 1998, or the application will be returned as
incomplete. The return of a project will necessitate resubmittal of all required items, including the application fee. If
you have any questions concerning this matter please feel free to call me at [phone].
Sincerely,
4'Y .
Ms. Linda Lewis
Environmental Engineer
RSS/arl: S:\WQS\STORMWAT\ADDINFO\931105.JUL
cc: Linda Lewis
Central Files
127 Cardinal Dr. Ext., Wilmington, North Carolina 28405 Telephone [phone] FAX [phone]
An Equal Opportunity Affirmative Action Employer 50% recycled/10% post -consumer paper

MIA .. • ���lj i ,f,�1�G111r��s�
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):
Greenbriar South Partnership
2. Print Owner/Signing Official's name and title (the person who is legally responsible for the facility and
its compliance):
Mauri C_P G _ E mar+ Tr
3. Mailing Address for person listed in item 2 above:
99 Aqua Vista Drive
City: Wilmincrton Stater`_ NC Zip: 28409
TelephoneNumber. ( 910 '791-171 3
4. Project Name (subdivision, facility, or establishment name - should be consistent with project name on.
plans, specifications, letters, operation and maintenance agreements, etc.):
Greenbriar South
5. Location of Facility (street address):
_ Located between Greenbr .ar Subc]ivision `off NC 132 and Rartan nabs
C1fy Wi 1 mi ngtr Co�miy New Hanrn7PY
6. Directions to facility (from nearest major intersection):
t 2 mile north of intersection of NC 132 and Cero ; a uAac r Rrnrl
7. 340 08' 30" Longitude 77° 52' 45" of facility
8. Contact person who can answer questions about the facility:
Name Maurice S . art . Jr. Telephone Number: ( 91 0.—) 791-1713
II. PERMIT INFORMATION:
1. Specify whether project is (check one): ------yew Renewal X Modification
2. If this application is bein g331105' submitted as the result of a renewal or modification to an existingpermit, list
the existingpemutnumber and its issue date (if knownR999_Mber 20, 1293
Form SW-101 January 1998 Page 1 of 4

3. Specify the type of project (check one):
Low Density X High Density Redevelop General Permit Other
4. Additional Project Requirements (check applicable blanks):
LAMA Major X Sedimentation/Erosion Control 404 Permit
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.
Stormwater will be treated with the use of two stormwater ponds
Sized to achieve a 90% reduction in total suspended solids. Anr1 a r-lirb outlet system.
2. Stormwater runoff from this project drains to the Cate Fear River basin.
3. Total Project Area: 46.04 acres
5. How many drainage basins does the project have. .3
4. Project Built Upon Area: 32.9 %
6. Complete the following information for each drainage basin. If there are more than two drainage basins in
the project, attach an additional sheet with the information for each basin provided in the same format as
below.
Draina a basin No 3 is a curb outlets stem.
NO.W
.. 1
Pt
Receiving Stream Name
tad tdbibny to Notts C3-'edc
Ikrm-ea to Notts C mek
Receiving Stream Class
CW
Drainage Basin Area
52.07 ac
8 ac
Existing Impervious" Area
Pro osed Im ervious'Area
17.13 ac
3.27 ac
% Impervious* Area (total)
33.7%
: lea
Draa:ge Brut �
Dz��age B
On -site Buildings
340,375 sf
77,950
On -site Streets
178,499 sf
42,725 sf
On -site Parkin
N/A
On -site Sidewalks
N/A
N/A
Other on -site
KA
N/A
Off -site
2Z7 165
N/A
Total:
E=746,039 sf= 17.13 ac
7-=142F 375 sf= 3.27 ac
* Impervious area is defined as the built upon area including, but not limited to, buildings, roads, parKIng
areas, sidewalks, gravel areas, etc.
7. How was the off -site impervious area listed above a m
draining to po rCl % .1 kiCx $ 66OW&
IV. DEED RESTRICTIONS AND PROTECTIVE COVENANTS
Deed restrictions and protective covenants are required to be recorded for all low density projects and all
subdivisions prior to the sale of any lot. Please see Attachment A for the specific items that must be recorded.
Form SVdU-101 January 1998 Page 2 of 4

E
MAY 2 6 1998
WK
DICKS'
May 26, 1998
�•
Ms. Linda Lewis
N.C. Department of Environment,
Health, and Natural Resources
Engineers
Division of Water Quality Section
Planners
Surveyors
127 Cardinal Drive Extension
Wilmington, NC 28405
Re: Greenbriar South Subdivision
New Hanover County
Project No. W9701.80
NCDWQ Project No. 931105
Dear Ms. Lewis:
In response to your letter dated May 18, 1998, the following is provided:
1) A check for $160.00 is enclosed. The initial check for $225.00 and this one now
brings the total to $385.00.
2) The number of drainage basins on page 2 of 4 of the application has been changed to
3.
3) The ponds and swales are located in drainage easements that will be recorded once
platted.
4) The 14.9 acres of off -site area draining into the existing pond is still correct.
5) The impervious number totals for No. 6 of Section III have been corrected. The
corrected sheet is attached to this letter.
-6) A copy of the recorded deed restrictions for lots 1-19 is provided. After reviewing the
"Declaration of Covenants, Conditions and Restrictions of Greenbrier South, Section
2," it was discovered that the restriction on impervious cover is 5,500 square feet for
each lot and not 5,775 square feet as stated in the deed restrictions originally
submitted in 1993 by Andrew & Kuske. Note, all the calculations are based on 5,775
sq ft per lot, therefore the pond and grass swales will have additional imperviousness
available than what we are allowing. A copy of pages 1,6,7 & 8 of the covenants is
provided. See Article VI, Section 3., (0 for the deed restrictions.
7) A note has been added its sheet C-1 that states that " Lots 40-50 shall be graded
and/or gutter shall be used such that the surface water runoff shall be directed to the
streets to be conveyed to the stormwater retention pond."
3177 Wrightsville Avenue Other Offices: Atlanta, GA Hickory, NC
Wilmington, North Carolina 28403 Asheville, NC Raleigh, NC
910.762.4200 Charlotte, NC Columbia, SC
Fax [phone]
www.wkdickson.com

8) Calculations are provided for the 1-inch storm event and for the 10-year storm event
for the grassed swales. The 5:1 slope extends across the entire bottom width of the
channel. The velocity for the 1-inch storm and for the 10-year storm are non -erosive
ME as shown in the calculations.
W 9) The swale details shown on sheet C-16 have been revised to show the location of the
Engineers 5:1 sideslo a The sideslo es will be grassed as per the seeding specifications
Planners P P 9 P 9 P
Surveyors shown on the plans. Each culvert has a flared end section at the outlet for a flow
spreader.
10) A revised Operation and Maintenance Plan is provided with the enclosed revisions.
11) Each 100' curb outlet swale has been labeled. A table is provided on sheet C-1
showing the swale number, length, invert in, invert out and slope.
Enclosed please find the following items:
the revised stormwater application for the referenced project. The number of
drainage basins has been changed to 3. The impervious areas have been
corrected.
- additional $160.00 application fee for modification
- two (2) copies of the revised calculations
- two (2) copies of following revised plans:
C-1 EROSION CONTROL & EXISTING TOPOGRAPHY, dated 4/3/98, revised
5/22/98
C-16 MISCELLANEOUS DETAILS, dated 4/3/98, revised 5/22/98
- Revised Operation & Maintenance Agreement for both ponds and the grassed
swales
If you need additional information please feel free to call.
Very truly yours,
WK DICKSON & CO., INC.
Mark N. Hargrove, P.E.
Encl.: As noted above.
cc: Greenbriar South Partnership

STORMWATER CALCULATIONS
FOR
GREENBRIAR SOUTH SUBDIVISION
WILMINGTON, NORTH CAROLINA
STORMWATER
E C E I V E
MAY 2 61998
D
D E M
PROJ #
PREPARED BY
WK DICKSON
3177 WRIGHTSVILLE AVENUE
WILMINGTON, NC 28403
[phone]
February 4,1998
(Revised 5/25/98)

GREENBRIAR SOUTH
1-INCH STORM
SWALE #1 (left side of Coronada Drive at Sta. 3+11)
AVERAGE SLOPE =
0.3%
n =
0.03 grass lined channel
m=
5
c =
0.4
1 =
1 in/hr
A =
3.83 ac
Q =
1.53 cfs
Zreq = Qn/1.49(sgrt (s))
Zreq =
0.56
B Y
A P R Zav
0 0.53
1.40 5.40 0.26 0.57
DEPTH = 0.53 ft
V =Q/A V =
1.09 fps
Velocity less than 4.0 fps ... no liner required
SWALE #2 (left side of Coronada Drive at Sta. 6+50)
AVERAGE SLOPE =
0.3%
n =
0.03 grass lined channel
M =
5
c =
0.4
1 =
1 in/hr
A =
4.99 ac
Q =
2.00 cfs
Zreq = Qn/1.49(sgrt (s))
Zreq =
0.73
B Y
A P R Zav
0 0.58
1.68 5.91 0.26 0.73
DEPTH = 0.58 ft
V =Q/A V =
1.19 fps
Velocity less than 4.0 fps ... no liner required
WK DICKSON
3177 WRIGHTSVILLE AVENUE
WILMINGTON, NC 28403
(910) 7824200
Page 1

GREENBRIAR SOUTH
1-INCH STORM
SWALE #3 (existing Swale between lots 3 & 4 on Coronada Drive)
AVERAGE SLOPE _
n=
m=
c=
A=
0.1 %
0.03 grass lined channel
5
0.4
1 in/hr
3.54 ac
Q = 1.42 cfs
Zreq = Qn/1.49(sgrt (s))
Zreq = 0.90
B Y A P R Zav
0 0.63 1.98 6.42 0.31 0.91
DEPTH = 0.63 ft
V =Q/A V = 0.71 fps
Velocity less than 4.0 fps ... no liner required
WK DICKSON
3177 WRIGHTSVILLE AVENUE
WILMINGTON, NC 28403
[phone]
Page 2

GREENBRIAR SOUTH
10-YEAR STORM
SWALE #1 (left side of Coronada Drive at Sta. 3+11)
AVERAGE SLOPE =
0.3%
n =
0.03 grass lined channel
m=
5
c =
0.4
1 =
6.3 in/hr
A =
3.83 ac
Q =
9.65 cfs - 10 yr storm
Zreq = Qn/1.49(sgrt (s))
Zreq =
3.55
B Y
A P R Zav
0 1.05
5.51 10.71 0.51 3.54
DEPTH = 1.05 ft
V =Q/A V =
1.75 fps
Velocity less than 4.0 fps ... no liner required
SWALE #2 (left side of Coronada Drive at Sta. 6+50)
AVERAGE SLOPE =
0.3%
n =
0.03 grass lined channel
m=
5
c =
0.4
1=
6.3 in/hr
A =
4.99 ac
Q =
12.57 cfs -10 yr storm
Zreq = Qn/1.49(sgrt (s))
Zreq =
4.62
B Y
A P R Zav
0 1.16
6.73 11.83 0.57 4.62
DEPTH = 1.16 ft
V =Q/A V =
1.87 fps
Velocity less than 4.0 fps ... no liner required
WK DICKSON
3177 WRIGHTSVILLE AVENUE
WILMINGTON, NC 28403
[phone]
Page 1

GREENBRIAR SOUTH
10-YEAR STORM
SWALE #3 (existing Swale between lots 3 & 4 on Coronada Drive)
AVERAGE SLOPE = 0.1 %
n =
0.03 grass lined channel
m=
5
c =
0.4
I =
6.3 in/hr
A =
3.54 ac
Q =
8.92 cfs -10 yr storm
Zreq = Qn/1.49(sgrt (s))
Zreq =
5.68
B Y
A P R Zav
0 1.25
7.81 12.75 0.61 5.64
DEPTH = 1.25 ft
V =Q/A V = 1.14 fps
Velocity less than 4.0 fps ... no liner required
WK DICKSON
3177 WRIGHTSVILLE AVENUE
WILMINGTON, NC 28403
[phone]
Page 2

,Sta*e of North Carolina
Department of Environment
and Natural Resources
Wilmington Regional Office
James B. Hunt, Jr., Governor
Wayne McDevitt, Secretary
Division of Water Quality
May 18, 1998
Mr. Mark Hargrove, P.E.
W.K. Dickson
3177 Wrightsville Avenue
Wilmington, NC 28403
AT4te•
�rMIL
.
NCDENR
NORTH CAROLINA DEPARTMENT OF
ENVIRONMENT AND NATURAL RESOURCES
Subject: ACKNOWLEDGEMENT OF RECEIPT AND
REQUEST FOR ADDITIONAL INFORMATION
Stormwater Project No. SW8 931105 Modification
Greenbriar Subdivision Phase III
New Hanover County
Dear Mr. Hargrove:
The Wilmington Regional Office received a modification to the Stormwater Management Permit
Application for Greenbriar Subdivision Phase M on April 9, 1998. A preliminary review of that information
has determined that the application is not complete. The following information is needed to continue the
stormwater review:
`f 1. The fee for modifications to detention ponds is $385.00. Please submit an additional $160.00.
2 2. The modification must address all aspects of the project. This project was previously approved
as a low density subdivision with a collection system, which required a detention pond. Now,
a part of the subdivision is proposed as low density with a curb outlet system, a part is high
density with a pond, and a part remains as low density with a collection system. Each of these
BMP's must be included on the application, resulting in three drainage basins, not two.
V13. Locate the ponds and curb outlet swales in recorded access/drainage easements.
v% 4. The 1993 approval did not request a map of the offsite area. It was assumed that the 14.9
acres was existing low density residential development @35 %. Do you still concur with this
assessment, or does it need to be further refined?
Z5. Section III, #6 of the application is confusing me. The impervious number totals in the
breakdown section do not match up with the Proposed Impervious area total in the boxes
above it. Please check.
/6. Provide a copy of the recorded deed restrictions for Lots 1-19.
127 Cardinal Dr. Ext., Wilmington, North Carolina 29405 Telephone [phone] FAX [phone]
An Equal Opportunity Affirmative Action Employer 50% recycled/10% post -consumer paper

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Mr. Hargrove
May 18, 1998
Stormwater Project No. SW8 931105 Modification
----------------------------------------------
7. You must provide a way to get the runoff from all impervious area on lots 40-150 into the
pond. Lot grading, guttering, and swale grading are all options that will be available in the
permit.
L '/ 8. Please provide calculations for the 3 curb outlet swales, indicating compliance with the
velocity and slope requirements for curb outlet systems.
1 _ 9. Both of the swale details on sheet C-16 show 3:1 slopes. Provide a detail of the curb outlet
y swale that show the 5:1 required slopes type o vege t1on, flow sprea er mec
---
vey,W-10. The Operation and Maintenance Plan needs to cover the curb outlet swales as well as the
p ponds. Please add swale maintenance requirements.
11. Label each of the 100' curb outlet swales, and provide inlet and outlet elevations r sloe
verification. p
Please note that this request for additional information is in response to a preliminary review. The
requested information should be received by this Office prior to June 18, 1998, or the application will be
returned as incomplete. The return of a project will necessitate resubmittal of all required items, including
the application fee.
If you have any questions concerning this matter please feel free to call me at [phone].
Sincerely,
Ms. Linda Lewis
Environmental Engineer
RSS/arl: S:\WQS\STORMWAT\ADDINFO\931105.MAY
cc: Linda Lewis
Central Files
127 Cardinal Dr. Ext., Wilmington, North Carolina 28405 Telephone [phone] FAX [phone]
An Equal Opportunity Affirmative Action Employer 50% recycled/10% post -consumer paper

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ENGINEERING a FACIunES APPLICATION FOR PERMIT FOR A
YE�C� LAND -DISTURBING ACTIVITY File Num�be� �
UNDER THE CONDITIONS SET FORTH BY
' ° * THE NEW HANOVER COUNTY Fee Pal
SOIL EROSION AND SEDIMENTATION CONTROL ORDINANCE
Date
Applicant:. Greenbriar Subdivison Applicant's Agent: W.K. DkkEm
Address: 99 Aqm Vista Ltiw 3177 •vi]1e
. Address:
WilndrYatai. 1VC 28409WLhdngbm, rZ 28403'
Telephone Number: [phone] Telephone Number: [phone]'.
Total Acres of Land Disturbance: 16.0 Purpose of Development: Vida—t
Location and Description of Land Disturbance:
1cmted in amer riar Saith aJa divisicn, 4iid is 1ccatrsd bets Bartm 03ks' and Gmak iar near 1
aiw
Jurctim. See vicinity nW m Flaris.
STATEMENT OF FINANCIAL RESPONSIBILITY
Land owner(s) of Record Person or firm(s) financially responsible for the
land -disturbing activity. If not a North Carolina
resident you must have a N.C. agent (List Below) i
Name: Grea>briar Subdivisim PawtErsjI n Name: Mizice S. Hnnart, Jr.
Address:99 Agm Vista Drive Address: 99 Agm Vista Iriive
--Wilmgnt m. NC 2.8409 Wiln ingbm, 1C 28409
Telephone Number: [phone] Telephone Number: [phone]
Location of deed(s) or instrument(s): County NEw flarrOvEr Book1213 page 0258
The above information is true and correct to the best of. my knowledge and belief and was provided by me while under oath.
(This form must be signed by the financially responsible person. ifan individual'acid by an officer, director, partner, attorney -in -
fact, or other person of authoriti to execute instruments for the financially responsible person if not an Individual.) I agree to
provide corrected information should there be any change in the information provided herein.
Date: - 3/25/98
Name (Type or Print) MmKim S-' art.• Jr.
Title: Gmsal. PardEr � .
Signature:
a Notary Public of the County of NpW Al n e Je r
Carolina, hereby certify at S ' �„� State of North
Ing duly sworn acknowledged that the above form was executed by him, appeared personally before me this day and be -
Witness my h d and notarial seal, this. rx J _ day of ,19�
Seal
Notary
My commission expires �d

WK
DICKSON
April 9, 1998
Ms. Linda Lewis APR 0 9 1998
N.C. Department of Environ nt,
Health, and Natural Reso
Division of Water Quality Section
Engineers 127 Cardinal Drive Extension
Planners Wilmington, NC 28405
Surveyors
Re: Modification to NCDWQ Permit for
Greenbriar South Subdivision
New Hanover County
Project No. W9701.80
NCDWQ Project No. 931105
Dear Ms. Lewis:
Enclosed please find the following items:
- original completed stormwater application for the referenced project
- $225.00 application fee for modification
- two (2) copies of the Calculations
- two (2) copies of plans:
C-1 EROSION CONTROL & EXISTING TOPOGRAPHY, dated 4/3/98
C-2 DRAINAGE LAYOUT, dated 4/3/98
C-3 CORONADA DRIVE, PLAN/PROFILE, STA. 0+00—11+00, dated 4/3/98
C-4 CORONADA DRIVE, PLAN/PROFILE, STA. 11+00—19+50, dated 4/3/98
C-5 CORONADA DRIVE, PLAN/PROFILE, STA. 19+50 — 27.41.94, dated 4/3/98
C-6 GRAY SQUIRREL DRIVE, PLAN/PROFILE, STA. 0+00—11+00, dated
4/3/98
C-7 GRAY SQUIRREL DRIVE, PLAN/PROFILE, STA. 11+00—14+42.57, dated
413/98
C-8 WEST GROVE DRIVE, PLAN/PROFILE, STA. 0+00 — 9+49.65, dated 4/3/98
C-9 CONTENDER LANE, PLAN/PROFILE, STA. 0+00 — 8+33.59, dated 4/3/98
C-10 MARSH WOOD DRIVE, PLAN/PROFILE, STA. 0+00 — 8+75.16, dated 4/3/98
C-11 LONE EAGLE COURT, PLAN/PROFILE, STA. 0+00 — 3+54.76, dated 4/3198
C-12 LONE EAGLE LANE, PLAN/PROFILE, STA. 0+00 — 2+07.58, dated 4/3/98
C-13 BURNING TREE, PLAN/PROFILE, STA. 0+00 — 2+019.15, dated 4/3/98
C-14 POND DETAIL W/ MISCELLANEOUS DETAILS_ dated 4/3/98
C-15 MISCELLANEOUS DETAILS, dated 4/3/98
C-16 MISCELLANEOUS DETAILS, dated 4/3/98
C-18 DRAINAGE BOUNDARY LAYOUT, dated 413/98
- Operation & Maintenance Agreement for both ponds
Also included is a stormwater narrative detailing how the surface runoff for the 1-inch
storm will be treated for the entire subdivision. An "Attachment A" is provided along with a
3177 Wrightsville Avenue
Wilmington, North Carolina 28403
910 762-4200
Fax [phone]
www.wkdickson.com
Other Offices: Atlanta, GA Hickory, NC
Asheville, NC Raleigh, NC
Charlotte, NC Columbia, SC

table breaking down each lot size in the low -density portion of the subdivision and the
allowable % imperviousness for each. A narrative is also included detailing the
impervious area per lot for the "high density" portion of the subdivision.
We request NCDWQ certification of compliance of this project with stormwater
�-
regulations. Thank you for your consideration of this request. If you need additional
information please call.
Engineers
Planners Very truly yours,
Surveyors WK DICKSON
/k fl
Mark N. Hargrove, P.E.
Encl.: As noted above.
cc: Greenbriar South Partnership

STORMWATER NARRATIVE
Stormwater management for the Greenbriar South Project will consist of utilizing the
existing detention pond, constructing one additional detention pond, and utilizing 100-foot
long grass swales at three locations. Each of the two ponds is sized to achieve a 90%
reduction in Total Suspended Solids.
The existing detention pond has a 52.07 acre drainage area. There are 37.17 acres of on -
site runoff being directed to the pond and 14.9 acres of off -site runoff being directed to
the pond. Note the previous permit No. 931105 included the 14.9 acres of offsite
drainage entering the pond. See sheet C-18 for the on -site drainage area for the existing
pond. Stormwater being directed to this pond will be collected via curb & gutter and a
piped system before it either enters the large ditch on'the south side of the property or the
pond directly. The large ditch on the south side of the property conveys stormwater
runoff to the existing pond.
The new pond has a drainage area of 8.87 acres. See sheet C-18 for the on -site drainage
area for Pond No. 2. Stormwater being directed to this pond will be collected via curb &
gutter and a piped system.
There are three locations where grass swales are being used to treat stormwater runoff in
areas considered "low density". Surface runoff for lots 2 through 9, which have been
previously recorded and permitted under low density, is directed to a 100-foot long grass
swale. Surface water runoff for lots 20 through 39 is being directed to two different
grass swales. Each swale has a typical cross section with a 5:1 slope on the bottom of the
swale for the 1-inch runoff depth. See sheet C-16 for typical cross section details.

STORMWATER CALCULATIONS
FOR
GREENBRIAR SOUTH SUBDIVISION
WILMINGTON, NORTH CAROLINA
_ SEAL
� % 6 e
IaI l!�OAAi��
" LAS
PREPARED BY
WK DICKSON
3177 WRIGHTSVILLE AVENUE
WILMINGTON, NC 28403
[phone] TORMWATER
April 9,1998
E C E ! V
APR 0 81888
D
D E M
PROJ #

WK DICKSON
Engineering 3177 Wrightsville Avenue
Land Planning Wilmington, NC 28403
Surveying [phone]
TOTAL AREA DRAINING TO EXISTING POND = 52.07 ACRES
TOTAL AREA DRAINING TO POND:
OFF SITE AREA = 14.9 ACRES (previous permit)
ON SITE AREA = 37.17 ACRES
TOTAL PROPOSED IMPERVIOUS SURFACE
AREA DRAINING TO POND:
ASSUME 35% IMP FOR OFF SITE AREA
EXISTING AND PROPOSED ROADS
EXISTING RECORDED LOTS AT 5775 SF/LOT
FOR 11 LOTS
53 1/2 LOTS AT 3,500 SF/LOT ALLOWED
28 LOTS AT 3,200 SF/LOT ALLOWED
% IMPERVIOUS=17.13/52.07 = 32.9%
= 227,165 SF (previous permit)
= 178,499 SF
= 63,525 SF
= 187,250 SF
= 89,600
= 746,039 SF =17.13 ACRES
REQUIRED STORAGE FOR 1-INCH OF RUNOFF FOR POND: (use Schueler Method)
= 0.05 + 0.009 (I)
= 0.05 + 0.009(32.9) = 0.346
=(1")(0.346)(1/12)(52.07)(43,560)
= 65,399 CF (94,150 CF PROVIDED, SEE ATTACHED
CALCULATIONS)
PERCENT IMPERVIOUS DRAINAGE AREA FOR POND:
= 32.9 %
POND DEPTH SA/DA %
(FT)
7.5 0.89
POND SURFACE AREA OUN.)
(SF)
IF POND DEPTH = 7.5 FT, MINIMUM SURFACE AREA = 20,187 SF
USED 90% TSS CHART TO SIZE POND
AREA @ ELEVATION 19.00 = 23,655 SF > 20,187 SF
20,187
PROJECT: GREENBRIAR SOUTH SUBJECT: POND CALCULATIONS JOB NO.: 9701
PREPARED BY: InYl' DATE: ,/ e CHECKED BY: DATE: PAGE NO OF

WK DICKSON
Engineering 3177 Wrightsville Avenue
Land Planning
Surveying
Wilmington, NC 28403
[phone]
STAGE -AREA -STORAGE FOR 1-INCH RUNOFF
ELEV.
AREA
STORAGE
TOT. STORAGE
(M)
(SFJ
(CF)
(CF)
NORMAL
19.00
23,655
-
POOL
24,567
20.00
25,479
24,567
26,409
21.00
27,3381
50,976
28,298
22.00
29,258
79,274
14,876
?" RUNOFF
22.50
30,245
94,150
POND RELEASE
TIME FOR
CONTROL PIPE: AREA 2 - POND #1
ELEV.
EFF. STORAGE
VOL. RELEASED
OUTFLOW RATE
RELEASE TIME
(M)
(CF)
(CF)
(CFS)
(HOURS)
22.50
94150
6.9
14876
_
0.602
22.00
79274
28307
0.557
14.1
21.00
50967
26500
0.455
16.2
20.00
24467
24467
0.322
21.1
19.00
0
TOTAL HOURS
58.3
DAYS
2.4
CONTROL PIPE :
3.5
JINCH
PROJECT: GREENBRIAR SOUTH SUBJECT: POND CALCULATIONS JOB NO.: 9701
PREPARED BY: MNAY DATE: y CHECKED BY: DATE: PAGE NO OF

WK DICKSON
Engineering 3177 Wrightsville Avenue
Land Planning Wilmington, NC 28403
Surveying [phone]
TOTAL SITE AREA THREE = 8.87 ACRES
TOTAL AREA DRAINING TO NEW POND = 386,174 SF
= 8.87 ACRES
TOTAL PROPOSED IMPERVIOUS SURFACE
AREA DRAINING TO POND:
ROADS = 42,725 SF
REMAINING IMPERVIOUS AREA =
19 LOTS AT 3,200 SF/LOT ALLOWED = 60,800 SF
1 LOT AT 4,900 SF/LOT = 4,000 SF
3 1/2 LOTS AT 3,500 SF/LOT ALLOWED = 12,250 SF
POOL HOUSE AREA (ASSUME 50%) = 21,700 SF
TOTALS = 141,025 SF = 3.24 ACRES
% IMPERVIOUS = 3.24/8.87 = 36.5%
REQUIRED STORAGE FOR 1-INCH OF RUNOFF FOR POND: (use Schueler Method)
= 0.05 + 0.009 (1)
= 0.05 + 0.009(36.5) = 0.379
= (1")(0.379)(1/12)(8.87)(43,560)
=12,203 CF (12,781 CF PROVIDED)
REQUIRED STORAGE FOR FOREBAY: 20% OF FIRST 1-INCH RUNOFF
= (0.2)(12,203)
= 2,441 CF (5,809 CF PROVIDED)
PERCENT IMPERVIOUS DRAINAGE AREA FOR POND:
= 36.5 %
POND DEPTH SA/DA %
(FT)/
4.0 3.10
POND SURFACE AREA (MIN.)
(SF)
IF POND DEPTH = 4.0 FT, MITOMUM SURFACE AREA = 11,971 SF
USED 90% TSS CHART TO SIZE POND
AREA @ ELEVATION 21.50 = 16,396 SF > 11,971 SF
11,971
PROJECT: GREENBRIAR SOUTH SUBJECT: POND CALCULATIONS JOB NO.: 9701
PREPARED BY: ON,# DATE: _t4Af CHECKED BY: DATE: PAGE NO_ OF —

WK DICKSON
Engineering 3177 Wrightsville Avenue
Land Planning Wilmington, NC 28403
Surveying
STAGE -AREA - STORAGE FOR 1-INCH
RUNOFF
ELEV.
AREA
STORAGE
TOT. STORAGE
(F7)
(SF)
(CF)
(CF)
NORMAL
21.50
16,396
-
POOL
4,996
21.80
16,911
4,996
3,417
22.00
17,257
8,413
3,486
22.20
17,605
11,899
882
1" RUNOFF
22.25
17,693
12,781
STAGE - AREA - STORAGE FOR FOREBAY
ELEV.
AREA
STORAGE
TOT. STORAGE
(FT)
(S19
(C19
(CF)
FOREBAY INV
17.50
507
-
295
18.00
673
295
866
19.00
1058
1,161
1,293
20.00
1527
2,454
1,993
21.00
2459
4,447
1,362
BERM ELEV
21.50
2990
5,809
[phone]
PROJECT: GREENBRIAR SOUTH SUBJECT: POND CALCULATIONS JOB NO.: 9701
PREPARED BY: InvW DATE: tZf,'L#Z CHECKED BY: DATE: PAGE NO OF

Engineering
Land Planning
Surveying
WK DICKSON
3177 Wrightsville Avenue
Wilmington, NC 28403
[phone]
POND RELEASE
TIME FOR
CONTROL PIPE: AREA 3 - POND #2
ELEV.
EFF. STORAGE
VOL. RELEASED
OUTFLOW RATE
RELEASE TIME
(F7)
(CF)
(CF)
(CFS)
(HOURS)
22.25
12781
882
0.091
2.7
22.20
11899
3486
0.088
11.0
22.00
8413
3417
0.074
12.8
21.80
4996
4996
0.058
24.1
21.50
0
TOTAL HOURS
50.6
DAYS
2.1
CONTROL PIPE
2
INCH
USED ORIFICE EQUATION TO DETERMINE OUTFLOW RATE
Q = Cd*A*(2gh)"1/2
PROJECT: GREENBRIAR SOUTH SUBJECT: POND CALCULATIONS JOB NO.: 9701
PREPARED BY: /27/0 DATE: 9 Ord' CHECKED BY: DATE: PAGE NO OF

GREENBRIAR SOUTH
LOW DENSITY
LOT SIZES
ALLOWABLE
LOT NUMBER
LOT SIZE
IMPERVIOUSNESS
(SF)
(SF)
20
16,099
4,900
21
13,381
4,900
22
12,203
4,900
23
11,575
4,900
24
11,698
4,900
25
16,049
4,900
26
20,723
4,900
27
28,608
4,900
28
29,563
4,900
29
19,516
4,900
30
14,992
4,900
31
15,097
4,900
32
13,758
4,900
33
17,636
4,900
34
18,422
4,900
35
37,090
4,900
36
39,832
4,900
37
25,682
4,900
38
18,390
4,900
39
17,723
4,960
TOTAL =
398,037
98,000
AVERAGE
LOT SIZE = 19,902
% IMP/LOT = 24.6%
STORMWATER
E C E I V E
D
APR
0 91998
PROD # sl.� 31/O5
NOTE: TOTAL DRAINAGE AREA FOR LOTS 2-9, AND 20-39 IS 14.60 ACRES
TOTAL ROAD ACREAGE IS 1.05 ACRES
TOTAL ACREAGE FOR LOTS 2-9 TOTALS 3.35 ACRES
ROAD ACREAGE TOTALS 0.28 ACRES
ALLOWABLE IMPERVIOUSNESS PER LOT FOR LOTS 2-9 IS 5,775 SF
(14.60 * 0.3) - 1.05 - 0 = 0.119 ACRES/LOT = 5180 SF/LOT
28
28 LOTS * 5180 SF = 145,040 SF IMPERVIOUS ALLOWED FOR LOTS
CURRENT IMPERVIOUS AREA TOTALS 144,200 SF
(8 * 5,775 SF + 20 * 4,900 SF) = 144,200 SF
144,200 SF + 1.05 AC(45,738 SF) = 189,938 SF = 4.36 AC
4.36 AC / 14.60 AC = 0.299 = 29.9% IMP

From: Self <NR0AR02/N1 EW456>
To: <[e-mail]>
Subject: Greenbriar
Date sent: Tue, 17 Mar 1998 14:47:15 -0500
Dear Bradley:
I may have just solved our problem in Greenbriar. The subdivision
meets low density from a built -upon standpoint, they just wanted a
collection system, so they put in the pond. That should have a
bearing in how we make this decision.
From your 3/10/98 email -
-Yes, the 8 lots can meet low density by themselves. I can't remember
if an extensive collection system is used for this runoff. I think
only catch basins and a little bit of pipe into the swale are all.
-Yes, the pond is sized for the entire drainage area, including some
offsite residential areas. There are the usual problems with
stabilization, but, the pond is in and functioning.
-Yes the engineer sent in the PE Certification on 1-20-98. 1
think that not enough weight is afforded by the engineer to the
review needed to certify a project. Certain engineers take it more
seriously than others. Perhaps a checklist of required items is
needed? A copy of the recorded deed restrictions has not been
submitted yet.
-The same developer would get the permit. Since the subdivision is
low density with a collection system, I think simply noting in the
permit that there are 8 uncollected lots would be OK, but a
modification to the permit is required.
-1 think that there needs to be an automatic fine for failing to
build in accordance with the approved plan and subsequently not
submitting for a modification for approval before building the
modification, based on the severity of the offense. Overbuilding
the impervious area and undersizing or not constructing of the
stormwater treatment device should receive the stiffest fines..
I think I can handle this one from here, now that I know it is low
density. From my last meeting with Mark Hargrove, they will
propose to increase the density to the pond. Apparently, those big
lots aren't selling as well. I think we can split out the old, low
density portion of the project from the revised, higher density part.
Does this sound OK to you?
I_L

Date sent: Tue, 10 Mar 1998 08:40:21 +0000
From: "Bradley Bennett" <brad ley_be n n [e-mail] r.state. n c. us>
Send reply to: [e-mail]
Organization: N.C. Division of Water Quality
To: Alida Lewis <[e-mail]>
Subject: Greenbriar
Linda,
I agree with you that we don't need to get in the habit of allowing
developers to built what they want and come back and say oh, by the way
I had do..... If they are going to make changes then they need to come
back to us and modify the permit. I guess the questions I have on this
one are:
• Will the eight lot areas meet low density by itself?
• Is there any problem with the pond? Is it sized appropriately for the
remaining
area?
• Did the engineer previously send in the engineer's certification? If
they did then
they obviously didn't review anything because this one ended up being a
lot
different than the approved project.
• Who would we propose issuing the approval to for the low density
portion or are we
just planning to modify the original permit to include both the low and
high
density portions?
This may be another area where we need to look at potential enforcement
on people that don't built in accordance with the approved plans. BB

From:
Self <NROAR02/N1 EW456>
To:
Bennett Bradley
Subject:
Greenbriar South
Copies to:
Moore Bill
Date sent:
Thu, 5 Feb 1998 10:59:55 -0500
Bradley:
I have a subdivision, permitted in 1993 as high density with a
detention pond, called Greenbriar. Well, the developers had a
problem with the grading of 8 of the lots and the road in front of
those lots, and created a low area that could not be collected to the
pond. The developer put in a 5:1 swale to treat the runoff. I only
found this out about a week ago because the developer wants to revise
the remaining subdivision area. Since that 8 lot area cannot be
collected to the pond, is it possible to permit it as a low density
area within a high density subdivision? I don't like doing it, but I
see no reasonable alternative, since rerouting the drainage will cost
the developer about $25,000.
I told the engineer I didn't like being the one to come up with a
solution to a problem I didn't create. I find it very
difficult to have this situation trrust on me. I mean, they
modified the system and didn't file any revisions with our Office,
in direct conflict with the Certification. My gut reaction is, it's
not my fault your engineer messed up and I don't care how much it
costs, fix it the way it was approved, but I know that may
be perceived as unreasonable.
My fear is that if we permit this, we'll start to see other projects
like this because the developer feels that it costs too much to
construct the project so that all the BUA is directed to the pond, as
required. If they don't like the way we require it to be built, they
will just build it the way they want to and then come back later with
a sob story about why they couldn't build it as approved, and we'll
have to accomodate them. I find this very unfair.
The engineer is going to the County TRC next Thursday, the 12th. If
I could have your opinion on this by then, I would appreciate it.
Thanks, LL

0 [R—EC
JAId 2 0 1998
TRIPP ENGINEERMG, P.C.
507 Chestnut Street Wilmington, North Carolina 28401
910/763-5100 Fax [phone]
LETTER OF TRANSMITTAL
Job No.
To: ADL)C R A (Z Date: 01 11,0v
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Attention: l�l ��1C I�t; W 15 �IQF�$EK RooFNJCs� -
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FAX TRANSMITTAL: NUMBER OF PAGES INCLUDES COVER
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( ) Prints ( ) Tracings ( ) Copy of letter ( ) Specifications ( ) Other
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Remarks:
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Signed• PAJI. h,

State of North Carolina
Department of Environment, Health, and Natural Resources
Wilmington Regional Office
James B. Hunt, Jr., Governor DIVISION OF ENVIRONMENTAL MANAGEMENT Bob Jamieson
Jonathan B. Howes, Secretary Regional Manager
July 11, 1995
Mr. Maurice S. Emmart, Jr.
99 Aqua Vista Drive
Wilmington, North Carolina 28409
Subject: REQUEST FOR ENGINEER'S CERTIFICATION
Stormwater Project No. 931105
Greenbriar Subdivision
New Hanover County
Dear Mr. Emmart:
On December 20, 1993, the Division of Environmental Management issued a Certification of
Compliance with Stormwater Regulations for Greenbriar Subdivision. Stormwater Regulation 15A NCAC
2H.1003(k)(3) stipulates the following:
Upon completion of construction, a registered professional appropriate for the type of
Stormwater system designed must certify that the system was inspected during construction
and was constructed in substantial conformity with plans and specifications reviewed by
the Division and complies with the requirements of this rule.
Additionally, the Certification of Compliance stated the following:
A professional engineer must certify that the stormwater system has been installed
in accordance with the approved plans and specifications upon completion of
construction. The attached certification should be received by this Office within 30
days of completion of construction.
127 Cardinal Drive Extension, Wilmington, N.C. 28405-3845 • Telephone [phone] Fax [phone]
An Equal Opportunity Affirmative Action Employer

Mr. Emmart
July 11, 1995
Stormwater Project No. 931105
As of this date, our records indicate the required engineer's certification has not been received.
Operation of the stormwater system prior to submission of the required certification is in violation of
NCAC 2H.1003(1) in accordance with NCGS 143-215.6. Since the facility has been constructed and
placed in operation, please submit the required certification (attached) immediately. Construction is
considered complete at the time the project is occupied by an owner or tenant for its intended use.
3900.
If you have any questions concerning this matter, please call Ms. Linda Lewis or me at (910) 395-
Sincerely,
Linda Lewis
Environmental Engineer
DA/arl: S:\WQS\STORMWAT\PEREQ\931105.JLTL
cc: Mr. Phil Norris, P.E.
Mr. Alan Golden, New Hanover County Inspections
(2) Linda Lewis
Central Files