SW8960518_Historical File_19960909

State of North Carolina
Department of Environment,
Health and Natural Resources
Division of Water Quality
James B. Hunt, Jr., Governor
Jonathan B. Howes, Secretary
A. Preston Howard, Jr., P.E., Director
September 9, 1996
Mr. Bob Weinbach, President
Beachwalk Development, Inc.
Gulfstream Group, Inc.
1009 North Lake Park Boulevard
Carolina Beach, North Carolina 28428
LT, , UK WA
A&14 071
9
[DEHNR
Subject: Permit No. SW8 960518
Beachwalk @Kure Beach
High Density Subdivision Stormwater Project
New Hanover County
Dear Mr. Weinbach:
The Wilmington Regional Office received the Stormwater Management Permit Application for Beachwalk @Kure Beach
on May 16, 1996, with final information on August 20, 1996. 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 960518, dated September 9, 1996, for the construction of Beachwalk @Kure Beach.
This permit shall be effective from the date of issuance until September 9, 2006, 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
ajudicatory 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
[phone].
Sincerely,
9;V 9d�cf-/�
Jim Bushardt, P.E.
Acting Regional Water Quality Supervisor
JBB/arl: S:IWQSISTORMWATIPERMIT\960518.SEP
cc: David Hollis, P.E.
Bill Hannah, Kure Beach Inspections
Tony Roberts, New Hanover County Impactions
Beth Easley, New Hanover County Engineering
Linda Lewis
Wilmington Regional Office
Central Files
P.O. Box 29535, Raleigh, North Carolina 27626-0535 Telephone [phone] FAX [phone]
An Equal Opportunity Affirmative Action Employer

State Stormwater Management Systems
Permit No. SW8 960518
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT, HEALTH AND NATURAL RESOURCES
DIVISION Or WA •TER QU``ZfY
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
PERIVIISSION IS HEREBY GRANTED TO
Beachwalk Development, Inc., and
Gulfstream Group, Inc.
Beachwalk @Kure Beach
New Hanover County
FQR THE ,
construction, operation and maintenance of a Detention Pond in compliance with the provisions of 15A NCAC
2H .1000 (hereafter referred to as the "stormwater rules') and the approved stormwater management plans and
specifications and other supporting data as attached and on file with and approved by the Division of Water
Quality and considered a part of this permit.
This permit shall be effective from the date of issuance until September 9, 2006 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 35 single family lots,
each allowed 6,000 square feet of built -upon area. The pond will also serve parts of the Kure Dunes
development, (Certification #920807) with lots restricted to 70 % maximum built -upon area.
3. Approved plans and specifications for this project are incorporated by reference and arP enforceable
parts of the permit.
2

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:
State Stormwater Management Systems
Permit No. SW8 960518
Beachwalk @Kure Beach
0-41,111
New Hanover County
Mr. Bob Weinbach, President
Beachwalk Development, Inc. and
Gulfstream Group, Inc.
1009 North Lake Park Boulevard
Carolina Beach, North Carolina 28428
May 16, 1996
Cape Fear River
"SC"
7.5 feet
Permanent Pool Elevation: 17.6 MSL ,
Total Impervious Surfaces Allowed: 1,210, 627 square feet
35 lots @6,000 square feet plus roads, clubhouse, tennis court, and multi -family area.
Kure Dunes lots @70 % maximum
Offsite area entering pond: Kure Dunes lots @70 % maximum BUA
Green Area entering Pond: 578,824 square feet
Required Surface Area: 31,234 square feet
Provided Surface Area:
Required Storage Volume:
Provided Storage Volume:
Temporary Storage Elevation:
Controlling Orifice:
42,485 square feet
98,111 cubic feet
125,182 cubic feet
20 MSL
4" pipe
3

State Stormwater Management Systems
Permit No. S%8 960518
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.
5. 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 permittee, and responsibility for meeting the built -upon area limit is
transferred to the individual property owner.
6. The Certification issued to the Town of Kure Beach for the Kure Dunes development (#920807) must
be revised to a permit covering the closure of the Kure Dunes pond, and the recordation of the required
deed restriction for the lots in Kure Dunes and the lots that are served by an infiltration system. Until
receipt of a revised permit for Kure Dunes, and stabilization of the Beachwalk pond, the Kure Dunes
pond must remain open.
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.
f. 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 flame 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 permittee will comply with the following schedule for construction and maintenance of the
stormwater management system:
a. The stormwater management system shall be constructed in it's entirety, vegetated and
operational for it's intended use prior to the construction of any built -upon surface except roads.
b. During construction, erosion shall be kept to a minimum and any eroded areas of the system will
be repaired immediately. r
2. The permittee grants permission to DEUNR Staff to enter the property for the purposes of inspecting
the project for compliance wit, the conditions of this permit.
4

State Stormwater Management Systems
Permit No. SW8 960518
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 it's 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. 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 Part I #2. The recorded statements must follow
the form:
a. The maximum built -upon area per lot is 6,000 square feet, 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. "
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. "Lots within CAMA's Area of Environmental Concern may be subject to a reduction in their
allowable built -upon area due to CAMA regulations."
If the subdivision exceeds low density, one of the following additional statements are necessary to
ensure that all runoff from built -upon areas of the lot is picked up by the pond. Additional statements
include:
e. "Roof drain gutters are required on all homes and must drain into the street. "
f. "Two-thirds of the lot must be graded toward the street."
g. "Perimeter swales and ditches must pick up the runoff and direct it into the pond."
6. 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.
5

State Stormwater Management Systems
Permit No. SW8 960519
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. A copy of the recorded deed restrictions must be submitted to the Division within 30 days of the date
of the recording. The recorded copy must be signed by the permittee, dated, stamped with the deed
book number and page, and bear the stamp of the Register' of Deeds.
9. 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.
M. 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 form 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
143-215.6(a) to 143-215.6(c).
3. The issuance of this permit does not preclude the Permittee from complying with any and all statutes,
rules, regulations, or ordinances which may bd 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.
S. 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.
Permit issued this the 9th day of September, 1996.
NORTH, CAROLINA ENVIRONMENTAL MANAGEMENT COMMISSION
A. Pre:"ftward, 7r., P.E., Director
Divisioater Quality
By Authority of the Environmental Management Commission
Permit Number SW8 960518
R1

State Stormwater Management Systems
Permit No. SW8 960518
Beachwalk @Kure Beach
Stormwater Permit No. SW8 960518
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,
(eject)
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 sdch 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 specification:
Signature
Registration Number
Date
VA

DIVISION OF ENVIRONMENTAL MANAGEMENT
NORTH CAROLINA STORMWATER MANAGEMENT PERMIT APPLICATION
I. GENERAL INFORMATION
1. Project Name CIF'
2. Location. directions to project (include County. Address. State Road) Attach man. Q�
3.Owner's Name
Phone �D(d — 456' 3cb7
4. Owner's Mailing Address (009 {,3. (►Ol (�c�v tG 1Y L77� .
City State QG Zip
5. Application date�� ��P Fee enclosed $ 3CS
6. Nearest Receiving Stream IpVJe-U RAA)e— / Class SB
7. Projectdescription
II. PERMIT INFORMATION
1.Permit No.(fobefilledinbyDEM) :5(A)g 7'(00sl?
2. Permit Type New Renewal Modification (existing Permit No.)
3. Project Type: Low Density Detention Infiltration Other: Redevelop General Dir Cert
4. Other State/Federal Permits/Approvals Required (Check appropriate blanks)
CAMA Major Sedimentation/Erosion Control V/ 404 Permit
III. BUILT UPON AREA (please see NcAC 2H.1005 thru .1007 for applicable density limits)
Drainage Drainage Breakdown of Impervious Area
Basin Basin (please indicate below the design impervious area)
Classification 5r::> Buildings 455, 400 sF
Allowable Impervious Area -7. [.- Gtcues
Total Project Area 24. C)&a,S
Proposed Impervious Area 14-A-acoes
% Impervious Area rQ(0 p
IV. STORMWATER TREATMENT (Describe bow the runofiwill be treated)
Streets {10 000
Parking/SW 4 CW 51P
Other 14)Z00 SP 4 54�y
Totals 14.4 ox-u es
d5r <c27, eroo sP

V. 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
for the type of project applied for.
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 covenant cannot be changed or deleted without
concurrence from the State, and that they will be recorded prior to the sale of any lot.
VI. OWNER'S CERTIFICATION
=,-i� vtcx-ems' (vl�C .
I, � Loe"a C.k `�c�v certify that the information included on this permit
(Please print or type name clearly)
application form is correct, that the project will be constructed in conformance with the approved plans, that
the deed restrictions 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.
I authorize the below rson or firm to submit stor ater plans on my behalf.
7
Owner/Authorized Agent Signature and Title D Ae
VII. AGENT AUTHORIZATION (musr BE compL=)
Person or firm name
23
Mailing Address
City OtIv ,t !!n! T State 11-� Zip 21340( Phone
Please submit application, fee, plans and calculations to the appropriate Regional Office.
cc: Applicant/WiRO//Central Files
Office use only0 u a R
L■_
D RMWAI
E C E I V E
MAY 161996
D
PROS # -?(A?fflxo5N I

r - -
RECEIVED AUG 1 9 1996
Hanover Design Services, P.A.
Land Surveyors, Engineers, Land Planners
e
August 16, 1996
Ms. Linda Lewis, Environmental Engineer
Department of Environment, Health and Natural Resources
Division of Environmental Management, Water Quality Section
127 Cardinal Drive Extension
Wilmington, NC 28405-3845
Re: Beachwalk at Kure Beach
New Hanover County
Stormwater Project No. SW8 960518
Dear Linda:
As per your third review letter dated August 5, 1996:
1. As we discussed on the phone today, the closing of the Town
Pond, #92087, will be handled as a separate Permit issue, and
your concerns will be addressed at that time, before the Pond
may be closed or filled.
2. Enclosed please find Attachment A for subdivision lots.
3. Attached please find two copies of the revised Plan, showing
the forebay wall to Elevation 20 to prevent short-circuiting.
I trust this additional information will result in approval of
the project. Please call me if I can be of any assistance
whatever. Thanks for your attention to this matter.
Sincerely,
David S. Hollis, PE, RLS
Attachments
%"111011 STV�lM .� ra'
r
�,R
E C E t V E
D AUG
2 01996
PROJ # AMLS,
18,
319 Walnut Street Wilmington, N.C. 28401 [phone]

State of North Carolina.
Department of Environment, Health, and Nazar al Resources
� office
James B. Hunt, Jr.
Govemor
Mr. David Hollis, P.E.
Hanover Design Services
319 Walnut Street
Wilmington, North Carolina
Dcar Mr. Hollis:
Wilmington Regio
DIVISION OF WATER QUALITY
WATER QUALITY SECTION
August 5, 1996
28401
Jonathan B. Howes
Secretary
Subject: ADDITIONAL INFORMATION
Stormwater Project No'. SW8 SW8 960518
Beachwalk @Kure Beach
New Hanover County
The Wilmington Regional Office .received a Stormwater Management Permit Application for
Beachwalk @Kure Beach on July 16, 1996. 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. I found out Friday that the Kure Dunes pond (Project #920807) will be filled in and closed
with the permitting of this project. I am sure you told me at the initial planning meeting that
we had, but I had not realized it until I spoke to Bill Hanna. Please show the method by
which the currently existing inlets into the 920807 pond will be piped/ditched into the new
Beachwalk pond. Include inverts of proposed and existing structures.
2. Attachment A indicating the 6,000 square foot BUA for the single family lots has not been
returned.
3. The wall of the forebay closest to the outlet structure must be raised higher than the
permanent pool elevation (at least to the storage elevation of 20) in order to alleviate short-
circuiting concerns.
127 Cardinal Drive Extension. Wilmington, N.C. 28405-3845 • Telephone [phone] • Fax [phone]
An Equal opportunity Affirmative Action Employer

Mr. Hollis
August 5, 1996
Stormwater Project No. SW8 SW8 960518
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 September 5, 1996, 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
DA/arl: S:\WQS\STORMWAT\ADDINFO\960518.AUG
cc: Linda Lewis
Central Files
2

,-A C.0 5
STORM SEWER AND
DRAINAGE CALCULATIONS
for
BEACHWALK at KURE BEACH
prepared for
Beachwalk Development Inc.
SH!ATE�
oe�CE1VE
JUL 161996 I°I
PROJ #
Hanover Design Services, P.A.
319 Walnut Street
Wilmington, NC 28401
CA
RO
11
.a
tz�-OliSSI® ,
q
SEAL %)
i onnm
V 0 (4_IDG
n '-7 , rC=7 C!)v�,

"BEACHWALK at KURE BEACH"
1. DRAINAGE AREAS TO POND:
Onsite - 24.O
Offsite - 4.5
From Town Pond - 11.8
TOTAL - 40.3 ACRES DRAINING TO POND
2. RUNOFF FACTORS: Leon and Lynn Haven Series
Hydrologic Soil Group "B/D"
Post -developed - 28.5 acres @ 65% = 77
11.8 acres @ 70% = 80
Weighted CN = 28.5X 77 + 11.8X 80 /40.3 = 78
3. Sedimentation Phase Considerations:
Volume required = 40 acres X 1800 cf = 72,000 cf
Volume provided below normal WSEL = 180,000 cf
Volume provided above normal WSEL acre-ft 2.g l
_ 15:1, 258 cf to top grate
4. For stormwater management ( SWM ) - I�Z& �c/iQZLX 5�Q� aus
DA = 40.3 acres = 0.06 sq.mi.
Tc (post) = 0.5 hr.
RCN post -developed = 78 Co - (a) _ 5Co
NOTE: Use Rational Method to determine peak discharges for
inlets, ditches, pipes and roadways.i�Use TR-20 for SWM and
Basin routing.
Use 24-hr. Type II distribution.
For New Hanover County, use:
7 inches for 10-year event
9 inches for 50-year event
10 inches for 100-year event
6. PEAK DISCHARGE SUMMARY -
Q(10) post -developed = 73 cfs @ WSEL = 21.1
Q(100) post -developed = 155 cfs @ WSEL = 22.1
See TR-20 Output.
See attached sheets for Basin details.
SWM SUMMARY -
BASIN Q(10)IN Q(10)OUT Q(100)IN Q(100)OUT WSEL(10) WSEL(100)
142.7 73.5 228.6 155.1 21.1 22.1

ADDITIONAL COMPUTATIONS FOR STATE D.E.M. -
I. Impervious calculations:
A. From Town Pond (from Von Oeson)
SA = 14,300 sf
Vol= 38,260 cf
B.
From off -site areas -
1. 4th Avenue - 3.3 acres @ 70% maximum
2. Largo Way - 1.2 acres @ 70% maximum
TOTAL 4.5 acres @ 70%
C. From on -site areas
1. Roads 5,000 LF X 22' =
110,000
sf
2. Community Center
a. Building 65 X 50 =
5,200
sf
b. Parking 160 X 25 =
4,000
sf
c. Pool & Walks 70X90+30OX4 =
7,500
sf
d. Tennis Courts 60 X 120 =
7,200
sf
3. Duplexes -
a. Buildings 60 units X 30 X 65 =
117,000
sf
b. Driveways 60 X 40' X 15' =
36,000
sf
c. Future development
i. 24 units max X 30 X 65 =
46,800
sf
ii. drives 24 X 40 X 15 =
14,400
sf
4. Single family, 36 lots @ 6000sf max =
216,000
sf
TOTAL ONSITE i' 564,100 sf
PLUS 10% SAFETY FACTOR - 56,410 sf
TOTAL 620,510 sf
= 14.2 acres
14.2 ac / 24.0 ac = 59% USE 60% IMPERVIOUS ONSITE
D. Combining factors
Offsite 4.5 acres @ 0.70
Onsite 24.0 acres @ 0.60
Weighted 28.5 acres @ 0.62 , USE 65% for safety
E. * SA / DA factor for 65% is 2, ( C ��OTsg �pN.th?G-r�
85% TSS, 7.51 depth (3691 egya ,.+-..tiye
28.5 X 0.01 X 3:3 = .9.4$ acre SA required
-42. t =-'_-17i» sf 07
+ Town Pond SA = 14,300 sf
TOTAL SA REQUIRED = ?. ��=,--sf 40,
w- Z't5, �

i
F. SA PROVIDED -
Pond No.1 - 31,215 sf
Pond Nc. 2 - 11, 2?0 sf
Total 42,485 sf
G. Volume -
1. Town Pond -
2. Offsite - 3.2 acres X 1/12
3. Onsite - 14.2 acres X 1/12
TOTAL VOLUME REQUIRED
H. VOLUME PROVIDED -
62,0jt -3-rE acre-ft. _
@ EL= 20.0
FUsa.C-E 0a *�& CX.-
f
= 38,260 cf
= 11,620 cf
= 51,550 cf
= 101,430 cf
I. Drawdown time - . 057
Usez'PVC A = 0.3 - sf 4" POc
C = 0.6
Q = CA(2gh) ^1/2 Q = 0-9-cfs OAS
T = 1Q4-,-7sec. 301 �Co- 75
= 2,-A-days
======== -*3 .
sae- C�" FOC pipe 4U
�I e Cu,4— c K Pam - .

. - jAk' 06-1996 09:19 FROM EHNR WILM REG OFFICE TO
• t
85% TSS REMOVAL
30 FOOT VEGETATED FILTER REQUIRED
93439y41 1j.62
3'
3.5'
4.0'
4.5'
5.0'
S.5'
6.0'
6.5'
7.0'
7.5'
PDEP'I�i
10 %
.9
.8
.7
.6
.5
0
0
0
0
0
20 %
1.7
1.3
1.2
1.1
1.0
.9
.8
.7
.6
1 .5
30 %
2.5
2.2
1.9
1.8
1.6
1.5
1.3
1.2
1.0
.9
40 %
3.4
3.0
2.6
2.4
2.1
1.9
1.6
1.4
1.1
1.0
50 %
4.2
3.7
3.3-
3.0
12.7
2.4
2.1
1 1.8
1.5
1.3
60 %
5.0
4.5
3.8
3.5
3.2
2.9
2.6
2.3
2.0
1.6
70 %
6.0
15.2
4.5
4.1
3.7
3.1
2.9
2.5
2.1
1.8
%
6.8
6.0
5.2
4.7
4.2
3.7
3.2
2.7
2.2
2.0
180
90 %
7.5
6.5
5.8
5.3
4.8
4.3
3.8
3.3
2.8
3.2
1.3
100%
8.2
7.4
16.8
J6.2
5.6
1 5.0
4.4
3.8
2.6
90% TSS REMOVAL
NO VEGETATED FILTER REQUIRED
DSPTS
3'
3.5'
4.0'
4.5'
5.0'
5.5'
6.0'
6.5'
10 %
1.3
1.0
.8
.7
.6
.5
.4
.3
20 %
2.4
2.0
1.8
1.7
1.5
1.4
1.2
1.0
30 %
3.5
3.0
2.7
2.5
2.2
L 9
1.6
1.3
40 %
4.5
4.0
3.5
3.1
2.8
2.5
2.1
1.8
50 %
5.6
5.0
4.3
3.9
3.5
3.1
2.7
2.3
60%
7.0
6.0
5.3
4.8
4.3
3.9
3.4
2.9
70 %
8.1
7.0
6.0
5.5
5.0
4.5
3.9
3.4
80 %
9.4
8.0
7.0
6.4
5.7
5.2
4.6
4.0
90 %
10.7
9.0
7.9
7.2
6.5
5.9
5.2
4.6
100 %
1 12.0
1 10.0
18.3
18.1
17.3
6.6 )
5.8
1 5.1
7.0'
7.5'
.2
.1
.9
.6
1.1
.8
1.4
1.1
1.9
1.5
2.4
1.9
2.9
2.3
3.4
2.8
3.9
3.3
4.3
3.6
62CI o
Z -)
Note: The requved surface area calculated from the tablessis �to be Yyn-vxdsd at the pmwm * g(,^1 eivition.
TOTAL P.02

RECEIVED AUG 1 9 1996
ATTACiDYVIEEIVT A
LOW DENSITY AND SUBDIVISION PROJECTS �P
�-GCo-9Cp
GENERAL SUBMITTAL REQUIREMENTS
A completed sormwater permit application.
2. Two sets of plans showing north arrow, scale, revision date, property/project boundaries, lot lines,
proposed and existing contours, drainage areas, mean high water line, wetlands, easements, the 30'
minimum vegetated buffer between impervious areas and surface waters, proposed impervious areas,
and road cross -sections.
Calculations of the built -upon area, For. subdivisions, please show the methodology for arriving at the
per lot built -upon area. For non -subdivision projects, please break down the calculation into buildings,
roads, parking, and other (include all impervious areas).
4. Low density projects with curb and gutter will require:
a. Drainage area delineation and swale locations shown on the plans.
b. Detail of the swale, showing minimum 5:1 side slope.
C. Velocity calculations, indicating a non -erosive flow for the 10 yr storm.
d. Inlet and outlet elevations. Maximum longitudinal slope is 5%.
e. The type of vegetated cover specified on the plans.
DEED RESTRICTION REQUIREMENTS fiC�V' l �uC V15 � ' N t ""'"'�'1
a
The following statements must be included for all low density projects, and for all subdivisions:
No more than 61 Owsquare feet of any lot, 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, not including wood decking or the water surface of swimming
pools. This covenant is intended to ensure 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.
No one may fill in or pipe any roadside or lot -line swale, except as necessary to provide a minimum driveway
crossing.
For curb and gutter projects, no on may pipe, fill in, or alter any lot line swale used to meet North Carolina
Stormwater Management Permit requirements.
NOTE If lot sizes vary significantly, the owner/developer must provide an attachment listing each lot number, size,
and the allowable built -upon area for each lot.

HANOVER DESIGN SERVICES, PA
LAND SURVEYORS, ENGINEERS, LAND PLANNERS
319 WALNUT STREET, WILMINGmN, NC 28401
I SHEET OF
(G c,+ fLwcre_ lc�c G.. 4 t 2 , 2. -
CA
. 70u!) K. 76m-d. I 7AIISI``Q%aIIj,y as,
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6, -- (10, 000 t5p
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ot, . ( ,Q�► c)Fp& tom' --
- tee_
3Ar/>A = 1.54
C1154- 13, 4EO ^7
r_ + 4 a :2?O CC)

i
HANOVER DESIGN SERVICES, IAA
'LAND SURVEYORS, ENGINEERS, LAND PLANNERS
319 WALNUT STREET, WILMINGTON, NC 28401
I SHEET Z. OF 2 I
Zexua.c.
tL 4 t'L •'2 -.c.N7
14rz
t \ a ( cam¢... Vaq r.
2G n c�
ro [cwrcd teq y=1 of CD C-'
"POL-10 DePI-t--F = W.;'
P Z('n4C%3,Vr"- POOL EL ?
IS J M5 L
- � tn�tt�cytcsu-s Wez Co31,t t�' s
4502-MAC-0 AQMIC4
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bssT:='s GTC' Aae-A Po &,-%D
4�,5 GA S @ -7oolo

DETENTION POND ANALYSIS FILE NAME: S:1WQS\POND1920807.WK1
PROJECT#: SW8 920807 REVIEWE ad
PROjECT NAME: Kure Dunes DATE: 05-Aug-96
Drainage Basin: Cape Fear River Class: C Sw Chlorides: n/a
Site Area 514000 square feet
Drainage Area 626403 square feet
Area in Acres 14.3802342 acres
IMPERVIOUS AREA
Runoff Coefficient
Buildings
307930 1
Adjusted SA
307930
Concrete
0 0.95
Adjusted SA
0
Asphalt
81194 0.95
Adjusted SA
77134.3
TOTAL
square feet
TOTAL
385064.3
% IMPERVIOUS 62.12%
Pond Depth:
7.5 TSS:
90
SURFACE AREA CALCULATION
SA/DA
Req. SA
Prov. SA
VOLUME CALCULATION
Green
Bottom
Perm; Pool
Design Pool
Design SA
Req. Volume
Prov. Volume
1.985%
=
square feet
square feet
[From plan Contours]
[From plan Contours]
Rv= 0.6090835
ORIFICE CALCULATION
Avg. Head =
1.0979167 ft
Flow Q2, cfs
0.22133507
Area, ino 6.317334
Dia 2, inches
Flow Q5, cfs
0.08853403
Area, ino 2.526934
Dia 5, inches <' .7
Engineer uses
.5 .h Area =
4.9087385 ho
Q, cfs =
0.1719833 Drawdown
COMMENTS

MEMO LETTER
HANOVER DESIGN SERVICES, P.A.
319 WALNUT ST.
W1LMMITON, NO 28401
Dom• 6
TO
I V E
• `� C'��I U � C+��-t. Cl�-- SAY 16
PRoJ #
CCT2,1 -5L4-mvy-" C>-r catcs
k&p.,e- � �� a-, a-u-c-
❑ ❑Afoy `
028000

Design Services, P.A.
Land Surveyors, Engineers, Land Planners
July 15, 1996
Ms. Linda Lewis, Environmental Engineer
Department of Environment, Health and Natural Resources
Division of Environmental Management, Water Quality Section
127 Cardinal Drive Extension
Wilmington, NC 28405-3845
Re: Beachwalk at Kure Beach
New Hanover County
Stormwater Project No. SW8 960518
Dear Linda:
Please find attached the revised Calculations, and two additionl
copies of the Plan with additions and revisions as requested in
your second review letter dated July 2, 1996, as follows:
1. I believe that we're okay on this.
2. I've revised the SA calculation to reflect 90% TSS removal.
Thanks for the swale info; I'm sure I'll use it on another
site that may be tighter.
3. I have raised the forebay side to prevent short-circuiting as
directed.
4. Elevations provided as requested.
5. I've corrected the flow arrows as directed.
6. I've eliminated perforations as suggested.
7. Sixth will flow at 0.3% all the way as shown. I've added spot
elevations and shown some existing elevations to clarify this.
All drainage will go to the pond. .41
I hope these revisions will result in a timely approval of this
project. Please call me if I can be of any assistance whatever.
Thanks for your attention to this matter.
Sincerely,
T��►S1�1tfjl� T r
David S. Hollis, PE, RLS D E C E I V E
Attachments JUL 16 1996
D
PROJ #_;I�Vo
319 Walnut Street Wilmington, N.C. 28401 [phone]

State of North Carolina
Department of Environment, Health, and Natural Resources
Wilmington Regional Office
James B. Hunt, Jr. DIVISION OF ENVIRONMENTAL MANAGEMENT Jonathan B. Howes
Governor WATER QUALITY SECTION
Secretary
Mr. David Hollis, P.E.
Hanover Design Services
319 Walnut Street
Wilmington, North Carolina
Dear Mr. Hollis:
July 2, 1996
28401
Subject: ADDITIONAL INFORMATION
Stormwater Project No. SW8 960518
Beachwalk OKure Beach
New Hanover County
The Wilmington Regional Office received a Stormwater Management Permit Application for
Beachwalk @Kure Beach on June 13, 1996. A preliminary review of that information has determined that
the application is not complete. The following information is needed to continue the stormwater review:
n�
The ponds in series I referred to are the permitted Kure Dunes pond and Pond 1 of
Beachwalk. You have accounted for the Kure Dunes development, therefore, the ponds in
, P series comment is directed more at future pond design. It is possible that design
requirements for the downstream pond may be relaxed if treatment has already' occurred in
an upstream pond. You realize that you were not required to direct the Kure Dunes outflow
into the Beachwalk pond. - 4, W be c I65,m4
¢4\yC A,0 2. The vegetated filter is NOT a swale. Please see the attached detail from the Professional
W C d Engineer's May 1988 yellow -cover publication that this Office used as guidance until the
regulations were revised. Please also see the newer vegetated filter strip from the BMP
guidance document. Rip rap is not sufficient to provide even distribution of the runoff over
the width of the swale.
3. Where you have brought that new swale into Pond 2, please raise the side of the forebay
weir high enough to force the runoff to exit the forebay at the other side, away from the
outlet structure. Short-circuiting is a concern.
4. Provide the finished elevations of the pool, clubhouse and tennis courts.
127 Cardinal Drive Extension, Wilmington, M.C. 28405-3845 © Telephone [phone] v Fax [phone]
An Equal Opportunity Affirmative Action Employer

Mr. Hollis
July 2, 1996
Stormwater Project No. SW8 960518
5. The flow arrows at the intersection of Fifth Avenue and the pump station road are still not
correct.
6. If the 4" cap fits on the end of the 6" orifice piping which is under the water, then the
perforated piping must be revised to solid PVC, or the 4" cap must be relocated to inside
the outlet structure.
7. How will the new portion of 6th Avenue be directed into the pond? No swales, curbcuts,
or finished elevations are noted.
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 2, 1996, or the application will
be returned as incomplete. The return of a project will necessitate resubmittal of all required items,
including the application fee.
DA/arl
cc:
If you have any questions concerning this matter please feel free to call me at [phone].
Sincerely,
5 yf
Ms. Linda Lewis
Environmental Engineer
S:\WQS\STORMWAT\ADDINFO\960518.J-UL
Linda Lewis
Central Files
0)

pM@M271
D
Hanover Design Services, P.A. JUN 13 1996
Land Surveyors, Engineers, Land Planners •- �.
June 12, 1996
Ms. Linda Lewis, Environmental Engineer
Department of Environment, Health and Natural Resources
Division of Environmental Management, Water Quat�}A"
127 Cardinal Drive Extension.=' ;> a
Wilmington, NC 28405-3845.� w�
Re: Beachwalk at Kure Beach E C E I V E
New Hanover County D
Stormwater Project No. SW8 960518 JUN 131996
Dear Linda: PROJ # fUOOSt?
Please find attached the revised Project Data Sheet Attachment A,
and two additionl copies of the Plan with additions and revisions
as requested in your letter dated June 12, 1996, as follows:
1. These ponds function as one; they have the same WSEL, they are
connected with oversize flat culverts to facilitate back and
forth flow. They are not ponds in series ( and I have not
analysed them as such with the TR-20 model ).
2. I have exchanged the VonOeson pages with your notes as
requested. I didn't mean to imply that you were working for
them, sorry.
3. I have revised the plan so that all areas drain to the pond,
please see 13. below.
4. Connector roads M and L are proposed and drain to the pond. I
have tried to show existing pavement dashed.
5. Vegetated shelf width labelled as requested.
6. The vegetated filter is shown as approximately 350' of nearly
flat swale. Velocity at maximum Q is less than 2.5 fps as
shown on the detail. No flow spreader is necessary other than
the delineated 30' of 611stone outlet protection; this will
reduce initial velocity and spread flows evenly through the
filter. Vegetation specs are given in the narrative and have
already been approved.
7. I have enclosed an additional Attachment A for the single
family lots restricting them to 6000 sf as in the calcs.
8. A note has been added directing roof drainage to the pond.
JUN 13 19 96
319 Walnut Street Wilmington, N.C. 28401 [phone]

10. The ponds do function together as one. Twin 36" culverts
ensure free flow either way. Head drives the system.
11. Good eyes! I missed this the first go -round, but have revised
the road grades and added a swale to direct this runoff to
the pond.
12. The Town Hall tract and parking areas drain to the existing
inlets shown in front. I have added arrows to indicate flows.
13. I have revised the computations to reflect no volume counted
in the swales, and changed the oriface size to 411.
Contractors have indicated to me that it is easier to use
611PVC with a 411hole drilled in the cap.
14. Side slopes have been labelled as requested.
15. Inlet and outlet inverts have been added to the culverts.
I'll use your guidelines for the next pond. Actually, the more
conservative 1" retention usually works quite well in conjunction
with City or County SWM requirements in dual use applications.
I hope these clarifications will aid in your being able to more
effectively evaluate this project. Please call me if I can be of
any assistance whatever. Thanks for your attention to this
matter.
Sincerely,
C..-,
David S. Hollis, PE, RLS
Attachments

State of North Carolina
nepa--tment of Environment, health, and Natural Resources
Wilmington Regional Office
James B. Hunt, Jr. DIVISION OF ENVIRONMENTAL MANAGEMENT Jonathan B. Howes
Governor WATER QUALITY SECTION Secretary
June 5, 1996
Mr. David Hollis, P.E.
Hanover Design Services
319 Walnut Street
Wilmington, North Carolina 28401
Subject: ADDITIONAL INFORMATION
Stormwater Project No. SW8 960518
Beachwalk Subdivision aKure Beach
New Hanover County
Dear Mr. Hollis:
The Wilmington Regional Office received a Stormwater Management Permit Application for
Beachwalk Subdivision @Kure Beach on May 16, 1996. 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. Ponds in series are currently under review by Central Office Staff for design requirements.
The hope is that the downstream pond surface area or volume may be reduced by some
factor that accounts for the treatment already achieved in the upstream pond.
2. The handwritten calculations from the 920807 file you included in your calculations are not
from Century von Oesen. They are my notes checking the adequacy of the design .taken
from the actual calculations provided by Century/von Oesen. My notes are for reference
only, and should not be used as part of a stormwater permit application. Please remove
them from the package and replace them with the actual Century/von Oesen calculations.
3. It appears that some of the road and duplex area runoff will bypass the pond. All runoff
from impervious surfaces must be directed into the pond.
4. Are the connector roads "M" and "L" proposed or existing? -Please find some way of
distinguishing the existing reads from the proposed roads.
5. Label the width of the vegetated shelf on the embankment detail.
127 Cardinal Drive Extension, Wilmington, N.C. 28405-3845 • Telephone [phone] • Fax [phone]
An Equal opportunity Affirmative Action Employer

Mr. Hollis
June 5, 1996
Stormwater Project No. SW8 960518
6. Add a detail of the vegetated filter, indicating the type of grass cover, and the flow spreader
mechanism. Include calculations indicating a non -erosive outlet velocity
7. Attachment A of the application should be used to restrict the built -upon area for the single
family lots. Built -upon area restrictions for lots are required for both low density and high
density projects in which lots will be sold and the developer will lose control of the land.
For other high density projects such as condos, apartments, shopping centers, etc., which
do not involve selling off lots, deed restrictions are not needed.
8. The restrictions for this type of development, a high density project that includes single
family lots, must include provisions for ensuring that all runoff from impervious areas on
the lots is directed into the pond. The permit conditions will outline three choices for
meeting this requirement:
a. Two-thirds of the lot must be graded to the street.
b. Gutters are required on all homes, and must be directed toward the street.
C. A rear lot line swale must be graded to ultimately drain into the pond.
Additionally, the clubhouse, pool and tennis areas must be drained toward the street. Add
a note to the plans that roof drains must be directed toward the pond.
10. Since Pond 1 flows into Pond 2, and a portion of the runoff never gets the benefit of Pond
1, the ponds do not function together and each must be reviewed separately to determine
if the surface area and volume requirements are met based on the drainage area. Please
provide calculations.
11. The flow arrows indicate the drainage from "L" Avenue is flowing north on Fifth Avenue
toward the unnamed street that Lots 32-36 front on while drainage from the Fifth Avenue
is flowing south toward "L" Avenue. No ditches, swales or pipes are noted to direct this
runoff into the pond.
12. Does the Town Hall tract drain into the project? Please indicate flow direction by arrows
and spot elevations at the centerline of the road.
13. According to the surface areas reported at 17.6 and 20, the volume provided in the pond
is less than you calculate. This Office cannot allow the use of the swales to count as storage,
but the storage provided in the pond proper is still enough to satisfy the requirements,
however, the decreased volume means the 6" orifice is too large. Please check the volume
and orifice calculations. See paragraph on next page.

Mr. Hollis
June 5, 1996
Stormwater Application #SW8 960518
14. Please label the 3:1 side slope on the embankment detail.
15. Add the inlet and outlet inverts of the 36" CMP's.
Our Office has recently begun using a modified Rational approach to determine the volume
generated by a 1 " storm event for pond sizing. A copy of the method is available in the Division's Best
Management Practices Guideline. I have enclosed a copy of the page in the BMP Guidelines where the
method is outlined. It is less conservative that the method used before, but more conservative that the SCS
method, which explains why there is sufficient total volume in the 2 ponds to satisfy the requirements.
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 July 5, 1996, 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
DA/arl: S:\WQS\STORMWAT\ADDINFO\960518.JUN
cc: Linda Lewis
Central Files
3

ATTACEUVIENT A
LOW DENSITY AND SUBDIVISION PROJECTS
GENERAL SUBMITTAL REQUIREAI[ENTS
A completed stormwater permit application.
2. Two sets of plans showing north arrow, scale, revision date, property/project boundaries, lot lines,
proposed and existing contours, drainage areas, mean high water line, wetlands, easements, the 30'
minimum vegetated buffer between impervious areas and surface waters, proposed impervious areas,
and road cross -sections.
3. Calculations of the built -upon area, For subdivisions, please show the methodology for arriving at the
per lot built -upon area. For non -subdivision projects, please break down the calculation into buildings,
roads, parking, and other (include all impervious areas).
4. Low density projects with curb and gutter will require:
a. Drainage area delineation and Swale locations shown on the plans.
b. Detail of the sv-ale, showing minimum 5:1 side slope.
C. Velocit}i calculations, indicating a non -erosive flow for the 10 yr storm.
d. Inlet and outlet elevations. Maximum longitudinal slope is 5 %.
e. The type of vegetated cover specified on the plans.
DEED RESTRICTION REQUIREN ENTS
The following statements must be included for all low density projects, and for all subdivisions:
6027, Z.010
No more than square feet of any lot, 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, not including wood decking or the water surface of swimming
pools. This covenant is intended to ensure continued compliance with the stormwaterpermit issued by the State
of North Carolina. The covenant may not be changed or deleted without the consent of the State.
No one may fill in or pipe any roadside or lot -line swale, except as necessary to provide a minimum driveway
crossing.
For curb and gutter projects, no on may pipe, fill in, or alter any lot line swale used to meet North Carolina
Stormwater Management Permit requirements.
NOTE If lot sizes vary significantly, the owner/developer must provide an attachment listing each lot number, size,
and the allowable built -upon area for each lot.
lea x^•_ ,r.; P.L. r- r r• o.«.......s.
D E C E I V E
MAY 161996
D
PROJ # 5W OS S

STORMWATER MANAGEMENT & EROSION CONTROL CALCULATIONS
f or
BEACHWALK at KURE BEACH
prepared for
Beachwalk Development Inc.
Hanover Design Services, P.A.
319 Walnut Street
Wilmington, NC 28401
n ,q
1 MA -Ill
pecerve
MAY 161996 D
D E RA
PROJ # S OS
••'L�H CAROI�'
��.•��ESSlO�y�,s
Q 9
SE AL s
20007 i
WV ��
.H0� 0
.
5 - 14-2SL

EROSION AND SEDIMENT CONTROL PLAN
BEACWALK at KURE BEACH
for Beachwalk Development Inc.
May 1996
NARRATIVE
NOTE: To be reviewed in conjunction with "Erosion and Sediment
Control Plan for Beachwalk at Kure Beach", Hanover Design
Services, P.A., Drawing No. 4477ESC - 96DH.
PROJECT DESCRIPTION -
The purpose of this project is to construct a residential
community of single family and duplex homes and the associated
development 'infrastructure. The Erosion and Sediment Control
Plan is to identify measures to be implemented to control
erosion during construction of the roads, utilities, and land
grading associated with this development.
The site is located off Dow Road west of Route 421, in
the Town of Kure Beach, New Hanover County, and is
approximately 23.98 acres in size, of which about 22 acres are
proposed to be disturbed. The site is open over most of its
area and has flat topography. It is bordered on the East,
North, and South by residential development, to the West by
open land, as per the approved Preliminary Plan.
SOILS -
The soil in the project area is primarily Leon and Lynn
Haven fine sands ( Le and Ly ) ; sands that are poorly drained,
rapidly permeable, with erosion "K" factors of 0.1.0, moderate
to severe erodibility. The hydrologic classification of the
soil is B/D. Because of the topography and the amount of
paving proposed, curbing and spill gutters will be the primary
means of stormwater transport for the 10-year event, with
wide, vegetatively stabilized swales as the primary means of
stormwater transport on and across the site for this event and
larger (overflow) events to the proposed pond/ basin.
(Soils Map attached)

NEW HANOVER COUNTY, NORTH CAROLINA = SHEET NUMBER 30
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