SW8940820_HISTORICAL FILE_19941005 (2)

STORMWATER DIVISION CODING SHEET
POST -CONSTRUCTION PERMITS
PERMIT NO.
SW8 (* 4 O $ 2 O
DOC TYPE
❑ CURRENT PERMIT
❑ APPROVED PLANS
HISTORICAL FILE
❑ COMPLIANCE EVALUATION INSPECTION
DOC DATE
t of g y\ 0 015
YYYYMMDD

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
October 5, 1994
Mr. P. Dean Potter, President
Gateway, Inc.
304 Snug Harbour Drive
Wilmington, North Carolina 28405
Subject: CERTIFICATION OF COMPLIANCE
with Stormwater Regulations
Stormwater Project No. SW8 940820
NorthChase-Williamsburg Place
New Hanover County
Dear Mr. Potter:
This Certification is pursuant to the application for NorthChase-Williamsburg Place received on
August 19, 1994, with additional information received on September 25, 1994. Staff review of the
project plans and specifications has determined that the stormwater control system as proposed for
NorthChase-Williamsburg Place will comply with the Stormwater Regulations set forth in Title 15A
NCAC 2H.1003(i). The runoff from 145,000 square feet of impervious surface plus 9,515 square feet
of off -site impervious surface will be treated in a detention pond sized to achieve 90 % reduction in Total
Suspended Solids.
Any modification of the plans submitted to and approved by this Office or further development
of this site regardless of the fact that the modification may be less than 1 acre, will require an additional
Stormwater Submittal/Modification and approval prior to initiation of construction. Modifications include
but are not limited to; project name changes, transfer of ownership, redesign of built -upon surfaces,
addition of built -upon surfaces, redesign or further subdivision of the project area.
This Certification shall be effective from the date of issuance until rescinded. The project shall
be constructed and maintained in accordance with the plans and specifications approved by the
Wilmington Regional Office. This Certification does not supersede any other permit or approval. The
developer is responsible for obtaining any and all permits and approvals necessary for the development
of this project. This could include the Division of Coastal Management under CAMA requirements, the
Division of Environmental Management under Wetland 401 Water Quality Certification and/or a Dredge
and Fill Permit and/or a Sewer Extension/Collection Permit, U.S. Army Corps of Engineers 404 Wetland
Permit, NPDES Stormwater Permit if disturbing five acres or more, local County or Town Agency
permits under their local ordinances, or others that may be required.
127 Cardinal Drive Extension, Wilmington, N.C. 28405-3945 • Telephone [phone] • Fax [phone]
An Equal opportunity Affirmative Action Employer

Mr. Potter
October 5, 1994
Stormwater Project No. SW8 940820
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.
The detention pond must be constructed in it's entirety, operational for it's intended use, and
permanently vegetated prior to the construction of any impervious surfaces proposed as a part of the
project, except roads.
If you have any questions concerning this matter, please call Ms. Linda Lewis or me at (910) 395-
Sincerely,
Dave Adkins
Water Quality Supervisor
DA/arl: S:\WQS\STORMWAT\CERTIMC\940820.00T
cc: David Hollis, P.E.
Sky Conklin, New Hanover County Inspections
Bradley Bennett
Jim Craig, New Hanover County
Linda Lewis
Wilmington-Regio'nal�e,
Central Files

Project Name:
Project Number:
Location:
Applicant:
Mailing Address:
Submittal Date:
DIVISION OF ENVIRONMENTAL MANAGEMENT
PROJECT DATA
NorthChase-Williamsburg Place
Water Body Receiving Stormwater Runoff:
Classification of Water Body:
If Class SA, chloride sampling results:
Pond Depth:
Permanent Pool Elevation:
Total Impervious Surfaces Allowed:
Offsite Area entering Pond:
Green Area entering Pond:
Required Surface Area:
Provided Surface Area:
Required Storage Volume:
Provided Storage Volume:
Temporary Storage Elevation:
Controlling Orifice Type/Diameter:
New Hanover County
Mr. P. Dean Potter, President
Gateway, Inc.
304 Snug Harbour Drive
Wilmington, North Carolina 28405
August 19, 1994
UT Smith Creek
"C SW I.
N/A
7.25 feet
27.0 MSL
145,000 square feet square feet
9,515 square feet
142,621 square feet
4,916 square feet
5,000 square feet
14,987 cubic feet
15,372 cubic feet
29.15 MSL
1.5" pipe

2
3
4
5
6
WET DETENTION POND EVALUATION
Yes No The design storage is for the runoff from all impervious surfaces resulting from
1-inch of rainfall and is located above the permanent pool.
Yes No The permanent pool is designed for 90% total suspended solid (TSS) removal.
Therefore, no vegetative filter is required.
Yes No The nmoff completely draws down to the permanent pool in 5 days, but not less
than 2 days.
Yes No The mean depth of the permanent pool is a minimum of 3 feet.
Yes No The inlet structure is designed to minimize turbulence and short circuiting.
Yes No An appropriate operation and maintenance plan has been provided for the
system.
7. Yes No THIS PROJECT MEETS THE STORMWATER CONTROL REQUIREMENTS
OF 15A NCAC 2H.1003 (g), (i), (k), and (1) (For Yes, 1 through 7 must all
be highlighted Yes.)
Brief Explanation: This detention pond is designed to remove 90% total suspended solids without the
aide of a vegetative filter.
DIVISION OF ENVIRONMENTAL MANAGEMENT SIGN -OFF
Wilmington Regional Office
5 OCT q 4 vG% 4"
Date Individual Evaluating Form/Plans
'501L. ��s� — � 024
Date Regional Water Quality Supervisor
cc: Applicant/Bradley Bennett/arl/WiRO/CF

NorthChase-Williamsburg Place
New Hanover County
Stormwater Project No. SW8 940820
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.
Signature
Registration Number
Date

PROJECT DATA
PiojectName Williamsburg Place at Northchase
Location (County,Township/Municipality, Address, State Road) New Hanover County,
Harnett -Township N.C. Highway 132 at Northchase Parkway
Owner's Name Gateway, Inc.
MailingAddress 304 Snug Harbour Drive
Wilmineton. NC 28405
Phone Number 910-392-2642 Submittal
.Brief Description (include map and appropriate
and triplex housine.
6.6 acres residential duplex
Its
Name of Water Body Receiving Stormwater Runoff Prince George Creek Tributary
/ Pumpkin Kiln Branch
Classification of Water Body �(3� C� If SA waters, engineered system, and distance is <0.5
miles, attach report of chloride sampling results N / A mg/I '� 0. 5 m i .
State/Federal Permits/Approvals Required (Check appropriate blanks)
LAMA Major
404 Permit_
Other (Specify)
CALCULATION OF BUILT UPON AREA
Sedimentation/Erosion Control x
DEM/DHS Sewage Disposal
Built upon area means that portion of a development that is covered by impervious or partially pervious cover
including buildings, pavement, recreation facilities, gravel, etc., but not including wood decking. If the project
includes areas draining to different water classifications, please note them separately below.
Classification
Built upon area
Total Project Area
% Built upon Area
Allowable B/U Area
Subwatershed
C C5w C
3.$ acres
(�2.& acres
30,2� °70 9.13�
%
Subwatershed :r
Is the Project B/U Area < the Allowable B/U Area? N o (If no, an engineered system is required.)
% Built upon area = (built upon area / total project area) : 100
Built upon area limits for projects to meet density: SA waters — 25%, Other —30%
STORMWATER COLLECTION SYSTEM
Describe how the runoff will be treated Retention Basin
Grass lined swales
ce , �t�IC
Arlan 09dn b 9M
SEP 1 5 1994 O
IrxoJ
SW B 614407Z0

BUFFER AREA
.Is thebuiltupon area at least 30 feet from mean high water. of all surface waters? Yes If no, please
provide a description
(Note: Only boat ramps, public roads, public bridges, and walkways to water related facilities are allowed
within 30 feet of the mean high water line if the project is intended to meet stormwater control
requirements through density limits.)
DEED RESTRICTIONS AND PROTECTIVE COVENANTS R �5`.
By my signature below, I certify that the recorded deed restrictions and protectOv ive covenants for this project
shall limit the allowable built upon area faP4et to '��?4�OQ square feet inclusive of right-of-way,
structures, pavement, walkways or patios of brick, stone, or slate, not including wood decking, state that
the covenants will be binding on all parties and persons claiming under them, that they will run with the
land, and that benefits may be enforced by the State of North Carolina, therefore, the covenant cannot be
changed or deleted without consent of the State. No one may fill in or pipe any of
the swales shown on the approved plan.
CERTIFICATION �f
I �j:/q/t/ //)//�/2 certify that the information included on this
submittal form is correct, that the project will be constructed in conformance with this information, and
that to the best of my knowledge, the proposed project complies with the requirements of 15 NCAC
2H.1003 (b). I authorize the below named person or firm to submit siormwater plans on my behalf, and
agree to abide by the deed restr on statement above.
t&:= A
�i2-9L
Owners Signature Date
Provide authorized person or firm name and address below:
I-�a►.�ooc-rz.Dest� t� ��c1ic�5� Pq.
P. Dean Potter, President
Gateway, Inc.
304 Snug Harbour Drive K)C ZB�v
Wilmington, NC 28405 DpruI J
��// D �ioflts , ICE
j Mary C. Grimshaw al\rotaryPublicfortheSLateof J�orth Carolina
County of New Hanover do hereby certify that P. ,,De`an.-PoUt-pr personally
appeared before me this 1 th day of August 19:9A ;, 21hd;a6}aiowledges the due execution
of the foregoing instrument. Witness my hand and official seal, `•;
My commission expires
Vf[Si iia::�c,
DIVISION OF ENVIRONMENTAL MANAGEMENT SIGN -OFF
Regional Office
5 OCT 94-
Dite
- L 4 S
Date
Individual Evaluating Forms/Plans
Quality Supervisor
cc: Applicant/WiRO/Bradley Bennett/Central Files

PROJECT DATA
Project Name. Williamsburg Place at Northchase
Location (County, Township/Municipal ity, Add ress, State Road) New Hanover County,
Harnett Township, N.C. Highway 132 at Northchase Parkway
Owner's Name
Gateway, Inc.
MailingAddress 304 Snug Harbour Driv
Wilmington, NC 28405
Phone Number 910-392-2642 Submittal
Brief Description (include map and appropriate
and triplex housine.
6.6 acres residential duplex
Its
Name ofWater Body Receiving StormwaterRunoff Prince George Creek Tributary
/ Pumpkin Kiln Branch
Classification of Rater Body C �� C?� If SA waters, engineered system, and distance is <0.5
miles, attach report of chloride sampling results NIA mg/I ')0. 5 mi .
State/Federal Permits/Approvals Required (Check appropriate blanks)
CAMA Major
404 Permit
Other (Specify)
CALCULATION OF BUILT UPON AREA
Sedimentation/Erosion Control x
DEM/DHS Sewage Disposal
Built upon area means that portion of a development that is covered by impervious or partially pervious cover
including buildings, pavement, recreation facilities, gravel, etc., but not including wood decking. If the project
includes areas draining to different water classifications, please note them separately below.
Classification
Built upon area
Total Project Area
% Built upon Area
Allowable B/U Area
Subwatershed
C �Dcw C ?
3.2 acres
(�%Cp acres
40 (O
30%
Subwatershed
Is the Project B/U Area < the Allowable B/U Area? N o Of no, an engineered
% Built upon area = (built upon area / total project area) * 100
Built upon area limits for projects to meet density: SA waters — 25%, Other —30%
STORMWATER COLLECTION SYSTEM .
Describe how the runoff will be treated Retention Basin
Grass lined swales
is required.)
lun(U SEP 0 R 1994 DD
kROJ ASW B C1468ZO

BUFFER AREA
Is the.built upon area at least 30 feet from mean high water of all surface waters? Y e s If no, please
provide a description
(Note: Only boat ramps, public roads, public bridges, and walkways to water related facilities are allowed
within 30 feet of the mean high water line if the project is intended to meet stormwater control
requirements through density limits.)
DEED RESTRICTIONS AND PROTECTIVE COVENANTS
By my signature below, I certify that the recorded deed restrictions and protective covenants for this project
shall limit the allowable built -upon area"F1et to 138 , 000 square feet inclusive of right-of-way,
structures, pavement, walkways or patios of brick, stone, or slate, not including wood decking, state that
the covenants will be binding on all parties and persons claiming under them, that they will run with the
land, and that benefits may be enforced by the State of North Carolina, therefore, the covenant cannot be
changed or deleted without consent of the State. No one may fill in or pipe any of
the swales shown on the approved plan.
CERTIFICATION
I, /'�//C%2 certify that the information included on this
submittal form is correct, that the project will be constructed in conformance with this information, and
that to the best of my knowledge, the proposed project complies with the requirements of 15 NCAC
2H.1003 (b). I authorize the below named person or firm to submit stormwater plans on my behalf, and
agree to abide by the deed rester on statement above.
/i a� - A&- &. 3-/2-9Y
Owner's Signature- Date
Provide authorized person or firm name and address below: AF1f��Ut=TL D�e� ��tzCJlee5� PA.
P. Dean Potter, President Aj L
Gateway, Inc. ` 2
304 Snug Harbour Drive �JC 28(Eo 1
Wilmington, NC 28405 J
tD S. [40Llts , PE
I, Mary C. Grimshaw ,a Notary Pub) ic for the State Of, North Carolina
County of New Hanover do hereby certify that Ptgr personally
appeared before me, this 1 th day of August 1�:4k''. and,atjric3wledges the due execution
of the foregoing instrument. Witnessmy hand and official seal,
My commission expires
ti
rL L:'itit::.6
DIVISION OF ENVIRONMENTAL NIANAGEMENT SIGN -OFF
Regional Office
Dite Individual Evaluating Fonns/Plans
Date Regional Water Quality Supervisor
cc: Applicant/WiRO/Bradley Bennett/Central Files

r
L
POND MAINTENANCE REQUIREMENTS
Project Name: 00 t 1
Responsible Party: T-, ""-" tnC. Phone
Address: 3G 4 5!' I" 4av6og-v DnL>e
l t(M t( c��a-sue IJC 2840 '�j
No. 5W8 — 9408 20
I. Inspect monthly, or after every runoff producing rainfall event, whichever comes first
A. Remove debris from the trash rack.
B. Check and clear the orifice of any obstructions. If a pump is used as the drawdown
mechanism, pump operation will be checked. A log of test runs of the pump will be kept
on site and made available to DEM personnel upon request.
C. Check the pond side slopes; remove trash, and repair eroded areas before the next rainfall
event.
D. If the pond is operated with a vegetated filter, the filter will be checked for sediment
accumulation, erosion and proper operation of the flow spreader mechanism. Repairs will
be made as necessary.
II. Quarterly
A. Inspect the collection system (ie. catch basins, piping, grassed swales) for proper
functioning. Accumulated trash will be cleared from basin grates, basin bottoms, and
piping will be checked for obstructions.
B. Pond inlet pipes will be checked for undercutting, riprap will be replaced, and broken
pipes will be repaired.
C. Grassed swales, including the vegetated filter if applicable, will be reseeded twice a year
as necessary. Eroded areas will be repaired immediately.
III. Every 6 months
0
IM
Accumulated sediment from the bottom of the outlet structure will be removed.
The pond depth will be checked at various points. If depth is reduced to 75 % of original
design depth, sediment will be removed to at least the original design depth._
APPROVED
NORTH CAROLIiN'A ENVIRONMENTAL
MANAGEM It.
DIVISIONOFchl iR:::a.ENT;ALMANAGEMENT
Dste 5 OCT ,1914-
Slcimvrffier Ce ilia cn Now 4037,0
$ —
U
SEP 0 8 1994
ggaJ #5w$ a403ZO

POND MAINTENANCE REQUIREMENTS
PAGE 2
IV. General
A. Mowing of the side slopes will be accomplished according to the season. Maximum grass
height will be 6".
B. Cattails are encouraged along the pond perimeter, however they will be removed when they
cover more than 1/2 the surface area of the pond.
C. The orifice is designed to draw down the pond in 2-5 days. If drawdown is not
accomplished in that time, the system will be checked for clogging. The source of the
clogging will be found and eliminated.
D. All components of the detention pond system will be kept in good working order. Repair
or replacement components will meet the original design specifications as per the approved
stormwater plan.
V. Special Requirements
I, 'P. T)'pQ /I �tri , hereby acknowledge that I am the financially
responsible party for maintenance of this detention pond. I will perform the maintenance as outlined
above, as part of th C ifrcation o ompliance with Stormwater Regulations received for this project.
Signature:L�� Date:
I, P— ZM51W,allotaryPublicfortheStateof �IW4 CAUUNA
County of N9Jj3 V CAL , do hereby certify that P. D a tj P6•f'f £Y.
personally appeared before me this 41— day of SEXEMB>ae , 19_�M, and acknowledge the
due execution of the foregoing instrument. Witness my hand and official seal, e¢raeace.._
My commission expires o/2 3 /9�_
DA/arl: S:\WQS\STORMWAT\FORMS\O&M-POND.FOR
�. GRI,14��y%.
a
J 41.
V . •�

c
�`biI✓4�j�i :..NO

ISPAVAC) 01 :@ e 0 MOA 11611) R.TJ 0 CiN&]
prepared for
WILLIAMSBURG PLACE AT NORTHCHASE.
for
Gateway Development, Inc.
SI 1 R511 A7ER
EM WE W bu
SEP 2 5 1994
D E M
VROJ 5(U313 3ZD
Hanover Design Services, P.A. It CAR jy4
"The Cotton Exchange" ��`p
321 North Front Street r iZZOFESS10/;4
Wilmington, NC 28401 i ��� SE AI l
1_ 20007 j

EROSION AND SEDIMENT CONTROL PLAN
NORTHCHASE APARTMENTS
for Gateway Development, Inc.
AUGUST, 1994
NARRATIVE
NOTE: To be reviewed in conjunction with "Erosion and Sediment
Control Plan for Northchase Apartments", Hanover
Design Services, P.A., Drawing No. 2940B-SC-94DH.
PROJECT DESCRIPTION -
The purpose of this project is to construct a residential
community of duplex and triplex buildings 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 N.C. Highway 132 and Northchase
Parkway West, in New Hanover County, and is approximately
6.640 acres in size, of which about 4.5 acres are proposed to
be disturbed. The site is wooded over most of its area and has
gently sloping to flat topography. It is bordered on the North
and East by residential development, and to the West and South
is forest conservation, as per the approved Northchase P.D.
Plan.
SOILS -
The soil in the project area is primarily a Murville
complex ( Mu ); loamy fine sand that is moderately to poorly
drained, rapidly permeable, with an erosion "K" factor of
0.10, moderate to severe erodibility. The hydrologic
classification of the soil is A/D. Because of the flat
topography, wide, vegetatively stabilized channels will be the
primary means of stormwater transport on and across the site
to the proposed pond/ basin. Because of wetness associated
with this soil type, care must be taken to maintain roadway
and channel slopes to the pond/ basin.
(Soils Map attached) �[tSl" 11 iV �ki�ATER
SEP 2 5 1994
D E M
rROJ # 5 w 8 9 40?Z(7

CALCULATIONS -
1. DRAINAGE AREAS:
For culverts, ditches, and roadway sections -
DA
AREA
Tc
"C"
I(10)
I(100)
Q(10)
Q(100)
I -
0.5
ac.
5
min.
0.75
7.0
10.0
2.6
cfs
3.7
cfs
II -
1.3
ac.
5
min.
0.75
7.0
10.0
6.8
cfs
9.8
cfs
III -
0.7
ac.
5
min.
0.75
7.0
10.0
3.7
cfs
5.2
cfs
IV -
1.7
ac.
10
min.
0.75
5.5
8.5
7.0
cfs
10.8
cfs
V -
0.9
ac.
5
min.
0.75
7.0
10.0
4.7
cfs
6.7
cfs
VI -
1.5
ac.
8
min.
0.75
6.0,
9.0
6.8
cfs
10.1
cfs
For stormwater management ( SWM ) -
DA = 6.6 acres = 0.0103 sq.mi.
Tc = 10 min. = 0.17 hr.
RCN pre -developed = 66
RCN post -developed = 85
NOTE: Use Rational Method to determine peak discharges for
culverts, ditches and roadways. 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
10 inches for 100-year event
2. PEAK DISCHARGE SUMMARY -
Q(10) pre -developed
= 27.96
cfs
Q(100) pre -developed
= 48.50
cfs
Q(10) post -developed
= 23.67
cfs
Q(100)post-developed
= 38.12
cfs
See TR-20 Output.
See attached sheet for Basin details.
U4 July_:
BASIN Q(10)IN Q(10)OUT Q(100)IN Q(100)0UT WSEL(10) WSEL(100)
1 42.67 23.67 64.45 38.12 30.67 30.85
*Note* All building elevations to be 32.00 or higher

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TR20 XEO 07-29-94 10:52 NORTHCHASE APARTMENTS 10-YR AND 100-YR PRE -DEVELOPED CONDITION
REV PC 097B3(.2) PRE-DEV, FILENAME 2940PR.T20
EXECUTIVE CONTROL OPERATION INCREM
+ MAIN TIME INCREMENT = .05 HOURS
EXECUTIVE CONTROL OPERATION COMPUT
RECORD ID
RECORD ID
+ FROM STRUCTURE 1
+ TO STRUCTURE I
STARTING TIME = .00 RAIN DEPTH = 7.00 RAIN DURATION= 1.00 RAIN TABLE NO.= 2 ANT. MOIST. COND= 2
ALTERNATE NO.= I STORM NO.= 1 MAIN TIME INCREMENT = .05 HOURS
OPERATION RUNOFF STRUCTURE
OUTPUT HYDR06RAPH= I
AREA= .01 SO MI INPUT RUNOFF CURVE= 66. TIME OF CONCENTRATION= .17 HOURS
INTERNAL HYDR06RAPH TIME INCREMENT= .0227 HOURS
PEAK TIME(HRS) PEAK DISCHARGE(CFS) PEAK ELEVATION(FEET)
12.03 27.96 (RUNOFF)
RUNOFF VOLUME ABOVE BASEFLOW = '.41 WATERSHED INCHES. 15.99 CFS-HRS, 1.32 ACRE-FEET: GASEFLOW = .00 CFS
--- HYDROGRAF'H FOR STRUCTURE 1, ALTERNATE 1. STORM 1, ADDED TO OUTPUT HYDRO6RAPH FILE ---
EXECUTIVE CONTROL OPERATION ENDCMP RECORD ID
+ COMPUTATIONS COMPLETED FOR PASS I

_ TR20 XEO 07-29-94 10:52, '-"l.l. NOBTHCHASE'APARTMENTS 10-YR AND 100-YR PRE-➢EVELOPED,COMUIT,ION4=:;`.;;
REV PC" 09/831:2)- FRE=UEV;: FILENAME 2940PRa20 ' " ' ' ...
'- -`-`
EXECUTIVE CONTROL OPERATION COMPUT
+ FROM STRUCTURE I
+ TO STRUCTURE 1
STARTING TIME = .00 RAIN DEPTH = 10.00 RAIN DURATION= 1.00 RAIN TABLE NO.= 2
ALTERNATE NO.= 1 STORM NO.= 2 MAIN TIME INCREMENT = .05 HOURS
OPERATION RUNOFF STRUCTURE 1
OUTPUT HYDROGRAPH= 1
AREA= .01 SO MI INPUT RUNOFF CURVE= 66. TIME OF CONCENTRATION= .17 HOURS
INTERNAL HYDROGRAPH TIME INCREMENT= .0227 HOURS
PEAK TIME(HRS) PEAK DISCHARGE(CFS) PEAK ELEVATION(FEET)
12.02 48.50 (RUNOFF)
RUNOFF VOLUME ABOVE BASEFLOW = 4.42 WATERSHED INCHES, 29.41 CFS-HRS, 2.43 ACRE-FEET; BASEFLOW = .00 CFS
--- HYDROGRAPH FOR STRUCTURE 1, ALTERNATE 1. STORM 2, ADDED TO OUTPUT HYDROGRAPH FILE ---
EXECUTIVE CONTROL OPERATION ENDCMP RECORD ID
+ COMPUTATIONS COMPLETED FOR PASS 2
EXECUTIVE CONTROL OPERATION ENDJOB RECORD ID
1
PA

TR20-XEO 07-29-94-10:52 ., NORTHCHASE APARTMENTS 10-YR AND 100-YR PRE-DEVELOPEDCON➢ITION'' :'
2:'•JOB;=.zlf?
SUMMARY<
REV PC
09/03(.21 PRE-DEV,
FILENAME 2940PR.T20
SUMMARY TABLE
1 - SELECTED RESULTS OF
STANDARD AND EXECUTIVE
CONTROL INSTRUCTIONS IN THE ORDER PERFORMED
(A STAR(l) AFTER THE
PEAK DISCHARGE TIME AND RATE (CFSI VALUES INDICATES -A'FLAT TOP
HYDR06RAPH
A DUESTION MARK(?)
INDICATES A HYDR95RAPH
WITH PEAK AS LAST POINT.)
SECTION/
STANDARD RAIN
ANTEC MAIN PRECIPITATION
PEAK DISCHARGE ._
STRUCTURE
CONTROL DRAINAGE TABLE
MOIST TIME -------------------------
RUNOFF ----------------------
-- '
ID
OPERATION AREA I
COND INCREM BEGIN
AMOUNT DURATION AMOUNT ELEVATION
TIME
RATE
RATE
(59 MI)
(HR) (HRI
(IN) (HR) (IN) (FT)
(HR)
(CFS)
(CSM)
ALTERNATE
1 STORM I
STRUCTURE 1
RUNOFF .01 2
2 .05 .0
7.00 24.00 2.41 ---
12.03
27.96
2714.4
ALTERNATE
1 STORM 2
STRUCTURE I
i
RUNOFF .01 2
2 .05 .0
10.00 24.00 4.42 ---
12.02
48.50
4709.0
TR20 XEO 07-29-94 10:52 NORTHCHASE APARTMENTS 10-YR AND 100-YR PRE -DEVELOPED CONDITION SOB 1 SUMMARY
REV PC 09/83(.2) PRE-DEV, FILENAME 2940PR.T20 PAGE 4
SUMMARY TABLE 3 - DISCHARGE (CFS) AT XSECTIONS AND STRUCTURES FOR ALL STORMS AND ALTERNATES
XSECTION/ DRAINAGE
STRUCTURE AREA STORM NUMBERS..........
ID (SO MI) 1 2
0 STRUCTURE 1 .01
ALTERNATE 1 27.96 48.50
LEND OF I JOBS IN THIS RUN

I
LIST OF INPUT DATA FOR TR-26 HYDROLOGY*****************
*
SOB TR-20 FULLPRINT SUMMARY
TI7LE 001 NORTHCHASE 10-YR AND EMERGENCY 100-YR HASIN RF_SERVIOR ROUTING
TITLE 000 ULTIMATE ZONING, FILENAME 2940SC.T20
STRUCT: '
B 27.0 0.0 0n.,
8 27.5 ..05 0.06
8 2S.0 0.07 0.1-7
8 28.5 0.08 0. o
8 29.0 0.10 0.11
Ell 29.15 0.10 0.:=1
8 29.5 1. 3 n. 0?
8 30.0 4.9 0.57
8 30.5 9.6 0.7-;
8 31.0 50.9 i.S0
9 ENDTHL
6 RUNOFF 1 01 1 .010.0 95. .17 1 n 0 1 0
6 RESVOR 2 02 1 2 27. n 1 1 0 1 0
ENDATA
7 INCREM 6 0.050
7 COMPUT 7 01 02 0. 7.0 1.0 _ 2 01 01
ENDCMP 'L
7 COMPUT 7 01 02 0. 10.0 7..n 2 01 02
ENDCMP 1
ENDJOB 2
OF 80-80
*
1

TR20 XED 09-13-94 15:13 NORTHCHASE 10-YR AND EMERGENCY 100-YR: BASIN R:ESE
RVIOR ROUTING JOB 1 PASS 1
REV PC 09/83(.2) ULTIMATE ZONING, FILF_NAMF_ 2940SC.T20
PAGE I.
EXECUTIVE CONTROL OPERATION INCREM
RECORD ID
+ MAIN TIME INCREMENT = .05 HOURS
EXECUTIVE CONTROL OPERATION COMPUT
RECORD ID
+ FROM STRUCTURE 1
+ TO STRUCTURE 2
STARTING TIME _ .00 RAIN DEPTH =- 7.00 RAIN DURATION= 1.00
RAIN TABLE NO.= 2 ANT. MOIST. COND= 2
ALTERNATE. NO.= t STORM NO.= 1 MAIN TIME INCREMENT = .05 HO
URS
OPERATION
RUNOFF STRUCTURE 1
OUTPUT HYDROGRAPH=
1
AREA= .OI SO MI
INPUT RUNOFF CURVE= 35.
TIME OF CONCENTRATIO
N= .17 HOURS
INTERNAL HYDROGRAPH
TIME INCREMENT=
.0227 HOURS
PEAK TIME(HRS)
PEAT: DISCHARGE(CFS)
PEAT:
ELE'VA
TION(FEET)
12.01
42.67
(RUNG
FF)
RUNOFF
VOLUME ABOVE BASEFLOW
= 4.26 WATERSHED
INCHES.
28.30 CFS-HRS,
2.54 ACRE-FEET:
BASEFLOW =
.00 CFS
--- HYDROGRAPH
FOR
STRUCTURE ],
ALTERNATE
1, STORM
1,
ADDED TO
OUTPUT HYDROGRAPH FILE
- -
OPERATION
R:ESVOR STRUCTURE 2
INPUT HYDROGRAPH= 1
OUTPUT
HYDROGRAPH-- 2
SURFACE ELEVATION=
27.00
PEAK TIME(HRS)
PEAK DISCHARGE(CFS)
PEAK
ELEVA
TIDN(FEET)
12.14
23.67
30.6
T1ME(HRS'j
FIRST HYDROGRAPH
POINT ==
.00 HOUR'S
TIME INCREMENT-
_
05 HOURS
DRAINAGE AREA =
.01 SO.MI.
5.50
DISCHG .00
.00
.01
.01
.01
.01
.01
.OI .01
.01
6.00
DISCHG .01
.01
.01
.01
.01
.01
.O1
.01 .cif
.01
6.50
DISCHG .01
.0
.02
.0:2
.02
.02
.02
.02 .02
.02
7.00
DISCHG .02
.02
.02
.02
.03
.07
.03
of .05
.03
7.50
DISCHG .03 .3
.03
.03
.00
.04
.04
.04
.04 .04
.04
8.00
DISCHG OA
.04
OA
.04
.05
.05
.05
.05 .05
.05
8.50
DISCHG .05
.05
.05
.05
.05
.05

.. .-I 1-1
.tea..,,- 11.1
. ,i.
.
.
...o
o6
. 06
.06
. i i6
9.50
DISCHG
.07
.07
.07
.07
.07
.07
.07
.07
.07
.07
10.O0
DISCHG
.07
.07
.07
.07
.07
.08
.03
.08
.08
.03
10.50
DISCHG
.08
„08
OB
.08
.08
.08
.08
.09
.09
.09
11.00
DISCHG
.09
.09
.09
.10
.10
10
.10
.10
.10
.26
11.50
DISCHG
.43
.62
.90
1.38
2.44
3.57
4.80
6.67
9.29
13.26
12.00
DISCHG
17.37
20.98
23.25
23.64
22.67
21.11
19.42
17.73
16.09
14.56
12.50
DISCHG
13.18
11.97
10.90
9.94
9.21
8.62
8.09
7.60
7.14
6.70
1.3.00
DISCHG
6.30
5.94
5.b1
5.30
5.00
4.76
4.54
4.34
4.15
S.97
13.50
DISCHG
3.80
3.64
3.50
2.36
3.22
3.09
2.98
2.87
2.76
2.66
14.O0
DISCHG
2.57
2.49
2.41
2.14
2.26
2.2o
2. 1 =°°
2. 07
2.01
1.96
14.50
DISCHG
1.90
1.85
1.80
1.75
1.71
1.66
1.62
1.58
1.54
1.51
1
TR20 XEQ 09--10-94 15:1.3 NOR:THCHASE 10-YR AND EMERGENCY 100-YR BASIN RESE
RVIOR ROUTLNN JOB I PASS 1
REV PC 09 / s 3 (. 2) ULTIMATE ZONING. FILENAME 2940SC:. T20
PAGE.
RUNOFF VOLUME ABOVE BASEFLOW 3.46 WATERSHED INCHES, 23.00 CFS-HRS,
1.90 ACRE-FEET:; BGSEFLOW = .00 CFS
--- HYDROGRAPH FOR STRUCTURE 2. ALTERNATE 1, STORM 1,
ADDED TO OUTPUT HYDROGRAPH FILE ---
EXECUTIVE CONTROL OPERATION ENDCMP
RECORD ID
+ COMPUTATIONS COMPLETED FOR PASS 1
I
TR20 XEO 09--10--94 15:1.3
R:V'IOR ROUTING
REV PC 09/83(.2)
NORTHCHASE 10-YR AND EMERGENCY 100-YR BASIN RESE
JOB 1 PASS 2
ULTIMATE ZONING, FILENAME 2940SC.T20
PAGE
EXECUTIVE_ CONTROL OPERATION C;OMPU T
RECORD ID
+ FROM STRUCTURE 1
+ TO STRUCTURE _.
STARTING TIME _ .00 RAIN DEPTH = 10.00 RAIN DURATION= 1.00
RAIN TABLE NO.= 2 ANT. MOIST. COND= 2

we.b
OPERATION RUNOFF STRUCTURE 1
OUTPUT HYDROGRAPH 1
AREA= .01 SD MI INPUT RUNOFF CURVE= 85. TIME OF CONCENTRATIO
J= .17 HOURS
INTERNAL HYDROGRAPH TIME INCREMENT= .0227 HOURS
PEAK TIME(HRS) PEAK DISCHARGE(CFS) PEAL'_. ELEVA
-ION(FEET)
12.01 64.45 (RUNO
F)
RUNOFF VOLUME ABOVE BASEFLOW = 6.70 WATERSHED INCHES. 44.54 CFS-HRS,
3.68 ACRE-FEET; BASEFLOW = .00 CFS
--- HYDROGRAPH FOR STRUCTURE 1, ALTERNATE 1, STORM 2,
ADDED TO OUTPUT HYDROGRAPH FILE ---
OPERATION RESVOR STRUCTURE
INPUT HYDROGRAPH= 1 OUTPUT HYDRDGRAPH= 2
SURFACE ELEVATION= 27.00
PEAK TIME(HRS) PEAV DISCHARGE(CFS) PEAK ELEVA
ION (F EEI '•
38.12 30.8
FI:MC(HFS)
FIRST HYDROGRAPH POINT _
.00 HOURS
TIME INCREMENT
=
5 HOURS
DRAINAGE
AREA =
.01 SO.Ml,
4.00
DISCHG
.00
.00
.00
.00
.00
.00
.01
.01
.01
01
4.50
DISCHG
.01
.01
.01
.01
.01
.01
.01
.01
.01
.01
5.00
DISCHG
.02
.02
.02
.02
.02
.02
0202
5.`i')
DISCHG-`
r)l
.02
.0-
.0_.
.03
.03
.03
-
.07.
.03
.03
.03
.0 :3
6.00
DISCHG
.04
.04
.04
.04
.04
.04
.04
.05
.05
.05
0.50
DISCHG
.05
.05
.cry
.05
.05
.05
.05
.05
.05
.06
7.00
DISCHG
.06
.06
.06
.06
.06
.06
.06 r6
.06 a6
.06
.06
7.50
DISCHG
.06
.06
.06
.07
.07
.07
.07
.07
.07
.07
8.00
DISCHG
.07
.07
,07
.07
.07
.07
.07
.07
.07
.07
8.50
DISCHG
.07
.08
.08
.08
ir8
.08
.09
.08
.08
.08
9.00
DISCHG
.08
.08
.08
.OB
.09
.09
.09 }9
.09
.09
.09
. 30
DISCHG
.01
.09
.09
,09
.09
.10
.10
.10
.10
.1i'
10.00
DISCHG
.10
.10
.10
.10
.16
.25
..34
.43
.52
.61
10.50
DISCHG
.70
.78
.B7
.97
1.07
1.16
1.26
1.42
1.61
1.80
11.00
DISCHG
1.98
2.15
2.32
2.50
2.67
2.84
1.00
3.17
3.36
1.55
11.50
DISCHG
3.75
4.02
4.58
5.69
7.21
3.86
11.00
14.26
18.89
24.41
12.00
DISCHG
50.01
74.90
37.79
37.94
36.09
_5.44
20.62
27.85
25.19
.__ . 72'

11.78
10.87
10.04
9.06
13.00
DISCHG
8.83
3.75
7.91
7.48
7.09
6.73
6.40
6.10
5.81
5.54
1.3.50
DISCHG
5.30
5.07
4.87
4.69
4.51
4.35
4.19
4.05
3.92
=.79
14.00
DISCHG
1.67
5.56
0.45
3.35
3.25
3.16
-.07
2.99
2.91
2.8;
14.50
DISCHG
2.76
2.69
2.62
2.35
2.48
2.41
2.35
2.30
2.25
2.20
R20 XEQ 09-- i 5-94 15: 13
'TOR ROUTING
REV PC 09/83(.2)
NORTHCHASE 10-YR AND EMERGENCY 100-YR BASIN RESE
JOB ] PASS 2
ULTIMATE ZONING. FILENAME 2940SC.T20
PAGE 4
RUNOFF VOLUME ABOVE BASEFLOW = 5.35 WATERSHED INCHES, 00.90 CFS-HRS,
.21 ACRE --FEET: BASEFLOW = .00 CFS
--- HYDROGRAPH FOR: STRUCTURE 2, ALTERNATE 1, STORM ._.
,DDED TO OUTPUT HYDROGRAPH FILE ----
;ECUTIVE CONTROL OPERATION ENDCMF'
RECORD 11)
COMPUTATIONS COMPLETED FOR PASS 2
XECUTIVE CONTROL. OPERATION ENDJOB
RECORD lD
?20 XEQ 09--12-94 15:13
!OR ROUTING
REV PC 09/82(.2)
NORTHCHASE 10--YR AND EMERGENCY 100-YR BASIN RESE
JOB 1 SUMMARY
ULTIMATE ZONING, FILENAME 2940SC.T20
PAGE 5
UMMARY TABLE 1 - SELECTED RESULTS
OF STANDARD AND EXECUTIVE
CONTROL INSTRUCTIO
IN THE ORDER: PERFORMED
(A
STAR:(*) AFTER
THE
PEA.. DISiHARGE TIME AND
RATE (CFS) VALUE.
&D1CATES
A FLAT TOR'
HYDROGRAPH
A
QUESTION MARK(?)
INDICATES
A HYDROGRAPH
WITH PEAK AS LAST
ENT.)
SECTION/
STANDARD
FAIN
ANTEC MAIN
PRECIPITATION
PEAK DISCHARGE
TRUCTURE
CONTROL
DRAINAGE TABLE
MOIST TIME -------------------------
R:UNOFF
---------------------------------------
ID
OPERATION
AREA
#
COND INCREM BEGIN
AMOUNT DURATION
.AMOUNT
ELEVATION
TIME
FATE_
RATE
(IN)
(SQ MI)
(HR) (HR)
(IN) (HR)
tF-T)
(HR)
(CFS)
(CSM)

,TRUCTURE 1
RUNOFF
.01
4.26
---
12.01
'TRUCTURE 2
RESVOR
.ill
=.46
30.67
11.14
ALTERNATE
1 STORM
!RUCTURE 1
RUNOFF
01
6.70
---
12.01
FRUCTURE 2
RESVOR
.01
5.85
3II.85
12.13
?20 XEO 09-1.3-94 15:1.1
COR ROUTING
REV PC 09/83(.2)
2 2 .05 .0 7.00 24.00
42.67 4142.4
2 . .05 i lt': . 0 .... , 7. 00 1; KX24. i 0ANI
3.67 2298-2
2 2 .05 -0
64.45 6257.7;
.05 . 0, .' . 10- 00 024.00
7T8. 12 .'701 . 1
NORT-ICHHSE .10-YR AND EMERGENCY 100=YR BA&IN RESE
JOB 1 SUMMARY
ULTIMATE ZONING, FILENAME_'2940SC.T20 s-
PAGE 6
WMARY TABLE .3 - DISCHARGE (CFE) AT XSECTIONS AND,STRUCTUR'ES FOR ALL STORMS AN
4_TERNATES
X TION/ DRAINAGE
RUCTURE AREA STORM NUMBERS........
Lit (_o MI) ; -
1 �'UCTURE 2 .01
ALTERNATE 1 23.67
TRUCTURE 1. .01
ALTERNATE 1
0 OF 1 JOBS IN THIS RUN
42.67 64.45

IANOVER DESIGN SERVICES, P.A.
LAND SuqvE-YORS & LAND PLANNI-PS
771E COTTON EXCHANGE321 NORM FRONT STREET
YALMINGTON. N.C. 28401
PHONE: [phone]
A
q 10
- --------- ----
-- --------
- - el
4-A -j I 1 I4
1p
V
7
_-j
M-j
yy -7
do
?, / -7, 0 4-o Sc' C),

MAN-MADE CHANNELS
VARIABLES LIST:
Y = FLOW DEPTH B - CHANNEL BOTTOM WIDTH S - CHANNEL SLOPE
0 - FLOWRATE M - CHANNEL SIDE SLOPE N - CHANNEL RDUGHNESS
VARIABLE TO BE SOLVED (Y.O.B,M,S OR N) ? 0
Y (FT) ? .313
B (FT) ? 0
11 (FT/FT) ? 31.3
S (FT/FT) ? .005
N (FT"1/6) ? .01_3
0-k"Kal o_&paj�x -61
(:roodAj_�¢y-
RESULTS
0=
f-i=
P=
u_
F=
7, 2-o c�
:Shift;> 'Prt Sc. print Return repeat
7.20 CFS
?. o7 SF
19.60 FT
2. 35 FPS
1.05 SUPER -CRITICAL FLOW
max, . !C3 - v- Q
�GtouQ� be bQcow
:Space Bar.. bac4 to mend
NATUR.I.. CHANNELS
VARIABLES LIST:
Y - FLOW ELEVATION 0 FLOWRATE S - CHANNEL SLOPE
VARIABLE TO BE SOLVED (Y.0 OR S) ? 0 Enter- up to 20 cross-section ooirits.
Enter- <::Return:, onlv for distance to end.
:' (FT.- ? .813
S (FT/FT) ? .005 CROSS-SECTION POINTS
DIST ELEV COEFF DIST ELEV COEFF
1 .813 .045
11 .313 .045
RESULTS 21 O .01'
0= 61.97 CFS 41 .813 .045
A= 18.13 SF
40.03 FT
V= 3.42 FPS
F= 0.89 SUB-CRITTCAL FLOW
:Shift.: ':Prt S(z> orint <Retu. -c reheat -Space Bar,. hacl to menu
---------------------------------------------------------------------------------
C
�t Ccxd ctu v(�� ea_y 1 c60-Li-d . 40
I r_ �
'zl-_

VARIABLES LIST:
Y - FLOW DEPTH
0 - FLOWRATE
�-Vne (Yl Lu
Coool�_y4j'_)-ct-'
MAN-MADE CHANNELS
B - CHANNEL BOTTOM WIDTH
M - CHANNEL SIDE SLOPE
VARIABLE TO BE SOLVED (Y.O.B.M.S OR N) ^ 0
Y (FT) 2
B (FT) 2
11 (FT/FT)
9 (FT/FT) .00,
N (FT"1/6) " .045
_Shi-Ft:" <.Prt Sc.,- nr int
(`�0..X1 wu�L.V►� C�Crt,�.5
RESULTS
W='
39.62
CFS
A=
L 6. 00
SF
P=
14.65
FT
V=
2.48
FPS
F=
0.41
S - CHANNEL SLOPE
N - CHANNEL ROUGHNESS
SUB --CRITICAL FLOW
.Return:> repeat 'Soace Bar: hacl, to menu
-----------------------------------------------------
5- l t KD'oL

][Q� IP E DATA � SHEET
.
Data 0, o ✓ �
jL
-L�
r
Sleet I o{
Project No.� I.D. No. � I
2,3
County iA
j
� ` 0 Detirned Br.�`t'S
Checked By
Sh.uEle.ldo�1"�o �L
Ele.. 3 (' g
I�tzrt-cc��-� I`�i2r�wa�G�-r
PLAN SUMMARY DATA.
Station �cE
Drainage Area ` O�Sac .
Design Freq. PO - ✓
Skew: no
Design Disch. 2 C
(1
Size/ Type Pipe: 2C � H.W. Izl
H 014-
TT.W.
Design H.W. Elev. .G
Type Entrance: ��o Sty LW
/�
0100 DisC�n.
S(J'
7—
0-1oo H.W. Elev.
Direction of Flow:
I"•.Ele..��•o
©•g
�✓
--
Overtopping E'req
Hydrological Method: KGt�(t711u..4
3e= /o
� �
Overtopping Discli.
H.W. Control Elev.: ��
L- ( 0
Overtopping Elev.
SIZE 1?z TYPE PIPE
Fray.
O
NaE
A]]e�.
T.W.
INLET CONT.
OUTLET CONTROL
El.,.
H.WLI
V.COMMENTS
HW�D
H.W.
So
do
da+ D
ho
H
LSo
H.W.
2
1,o
0,40,5
2.0
3i,�OcL�
am
10
{� �
[c)-
/ /
`p�eo t5 �.(o
SUMMARY AND RECOMMENDATIONS:
`(�
H
1-3
th
3
CJ

"
180 -
10,000
168
8,000 EXAMPLE
(3)
J
156
6,000 0-42 inches (3.5 felt)
6.
6.
5
144
5,000 Q. 120 cf•
4,000 11 • 11W
6•
5.
132
0 feet
4.
-
120
(2) 2.1 7.4
2.000 (3) 2.2 7.7
4•
3
108
3'
'D In feet
96
1,000
3'
800
.84
600
2.
2-
//
500 /
72
400 / 3
2.
to
=
300
C
1.5
1.5
Z
N
CK:
1.5
60 u
200
Z
_
Z
w
0
54
CY
/ Q
�w
00
j
48 / x
¢
Z
80
a
~
U
42X
60
1.0
1.0
O
1.0
50 HW ENTRANCE
o
SCALE
40 D TYPE w
10
36
30 (1) Sguar••dae.Ilh 3
w
33
head roll
Q
"
Q
20 12) Croon end .itn w
30
h.ad.all x
.8
.8
(3) Groove end
•6
27
t+rolectlnq .
10
8
.T
.7-
24
7
6 To use scale (2) oc (3) protect
,L I
5 horizontally to scale (i),th.n
4 .1. straight Inclined line through
0 and 0 scales, or rovers• as
' Illustrated.
3
6
.6
—.6
18
2
15
11.0
.5
5
.5
12 HEADWATER DEPTH FOR
CONCRETE PIPE CULVERTS
FHWA WITH INLET CONTROL
NONDGRAPH I -
U'
BRIDGE DIVISION HYDRAULIC MANUAL 12-85
4 - 35

2000
\
u
1000
800
120
600
108
500
96
400
84
300
72
66
200
60
to
54
U
Z
m
D.48
-
w
48-- 7
S
/
a
z
/
100
42
w
/z
-
0,10
60% -
a
2
36
N
60 Of
33
w
5 0 1-
LU
30
40 Q
0
27
30
24
i
/
20
21
PRESSURE LINE A
W H H
z Hw T' -- 5
0 / O / —► \ .
P = \ 6
UNSUBMERGED OUTLET SUBMERGED OUTLET
H•
/ /
O !
/ L•110 b ryp0 J�
-- Ls •0.5 00
aoo
.8
1.0
5
6
8
10
/I 8 L 20
EQUATION: H •2.5204 (I-C,) 466.18 ns L 1(0 s
` De Dua 'Ji10�
10 1 5
H - Head in feet
8 C.- Entrance loss coefficient
D - Oiameter of pigs in feel
1 2 n - M onnrng's roughness coefficient
6 L - Length of culvert in feet
5 0 - Design discharge rate in cfs
4
FHWA HEAD FOR
CONCRETE PIPE CULVERTS
FLOWING FULL
\ n=0.012
�J NOMDGRAPH K
BRIDGE DIVISION HYDRAULIC MANUAL 12-85
4 - 39

U
120 - 30
114
108 2
- 102
96 10
90
84
50
78 4
72 3
`6 2
60\\
,I
w
54
a
x
w 48 a 5
d o 4
t
u
� 30
42 0
w 20
H
w
a 36
0 10
" 33
0
30 5
4
27
3
24 2
21 F
El
15
••
•
••
•
•
•
0.-99
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HANOVER DESIGN SERVICES, P.A.
The Cotton Exchange
321 N. Front Street
WILMINGTON, NORTH CAROLINA 28401
(9,19�) 3343.18002
TO. I J ��L1 IS1
�1(jZS l(5k 0 girt _�_
(� n� r ut r,SL /' Ir
> WE ARE SENDING YOU ❑ Attached , ❑ Under separate cover via'_
❑ Shop drawings ❑ .Prints
❑ Copy of letter ❑ Change order
❑ Plans
LIFUTEN VF MUSEWUL
the following items:
❑ Samples ❑ Specifications
COPIES
DATE
NO
DESCRIPTION '
1
.�
SEP 2 5 1994
THESE ARE TRANSMITTED as checked below:
❑ For approval ❑ Approved as submitted
❑ For your use ❑ Approved as noted
> ❑ As requested ❑ 'Returned for corrections
❑ For review and comment ❑
REMAR
L) a VI
PROJ
❑ Resubmit copies for approval
❑ Submit copies for distribution
❑ Return corrected prints
❑ FOR BIDS DUE 19 ❑ PRINTS RETURNED AFTER LOAN TO US
COPY
PRMT 2W Im, Gam, aai 01411
SIGNED:
If enclosures are of noted, kindly notify us at once.
I]

1
- - ENGINEERING h FACILITIES
APPLICATION
FOR
PERMIT
FOR
A LAND -DISTURBING ACTIVITY
UNDER THE CONDITIONS SET -FORTH BY
THE NEW HANOVER COUNTY
59-94
File Number
12is-o 0
Fee Paid
( C
STORM �
69 EC E � VV
SEP 1 9 1994
SOIL EROSION AND SEDIMENTATION CONTROL ORDINANCE
Applicant:- 42,4 !✓A./ ��!/�'/ %iyf�✓�
Address:1./�G,ekae a
// C� S
Telephone Number: , ;7- % Z
Total Acres of Land Disturbance: 4�
Location and Description of Land Disturbance
PROD
Applicant's Agent:-144JQp( jib-$iG(J �fCL11C(
Address: 321 K� iyx_yd+.
u �
Telephone Number:
Purpose of Development:�Z25 aacA•+LaA
Approximate Start Up Date: (toZ`, 94 Approximate Completion Date: I'('). I - pi G
S TEMENT OF FINANCIAL RESPONSIBILITY
Land owners) of Re rd
NameAwN=S UPS =C_" 4 SE. Cy` M
Address: 7�4 I�pG'tL�LLSG a"a,
U )CW CL rJR4l NC ZR405.
Telephone Number: 2-9 (:3 _f2--1 Ze,J
Location of deed(s) or instrument(s):
pa>+0- , oco0- , c tease p D.
Person or firm(s) financially responsible
foor1 the land -disturbing activity 1
Name: ( 1Q�P��3Q.lw Lpf�P�ll �]4tCPLt L
Address: "-T
County
Book Page
County Book Page
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 if an individual and by an officer, director, partner, attorney -in -fact, or other
person of authority to execute instruments for the financially responsible person if not
an individual.)
Date: 1 7 • �� Name (Type or PrinF?,Da0_yt, iDi(?,✓
Title:
Signature:

85.TSS
REMOVAL
WITII 30' VEGETATIVE
FILTER
SA/DA
-
'T
LOFT
4 . `_•F7'
5 , OFT
5 . 5FT
(,. OFT 6. 5FT 7. OFT
7 .5FT
Ih9PER.
3 . OFT
3 . `
8
7
6
5
5
l0a
200.
9
1.7
1.3
1.2
1.1
1.0
9
1.5
.8
1.3
.7
3.2
.6
1.0
.9
30°;
2.5
2 2
3. 9
1.8
1.6
2.3.
1.9
1.6
1.4
1..1
1 0
400
3.4
3.0
2.6
2 �� O
:.7
2.4
2.1
1.8
.1:5
1.3
4.5
3.8
3.5
3.2
2.9
2.9
r
2
2.11
8
1.8
6 0 %
700
5.0
6.0
5.2
4.5
4.1
3.7
3.1
3.7
2.9
3.2
.5
2.7
2.2
2.0 .
80o
G.8
6.0
.5.2
c.7
5.3
4.2,
4.8..
4.3
3.8
3.3
2.8
1.3
2.6
0%
.5
6.5
5.8
6.2
5.6
5.0
A.4
3.8
3.2
1000
8.2
7.4
6.8
SA/DA - > 90% TSS, REMOVAL Ff,
�
FOR WET DETENTION WITHOUT VEGETATIVE FILTER
a
3 OFT
3 . 5FT
4 . OFT
4 . 5FT
5-. OFT.
5.5F2
6 . OFT
6. 5F3
7 .�F2
�r iNYw
gR.
10°.
.
1.3
1.0
8
7
' : 6,:
1.5.
1.4
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... 1.0
9
6
6
200
2.4
3.5
2.0
3.0
1.8
2.7
1.7
2.5
2.2
1.3
1.8
1 ..1
l.4' 1
30%
4.5
4.0
3.5
3.1
2.8
2.5
2.5
2.1
2.1
..
1.5
40%
SOo
5.6
5.0
4.3
5.3
4.8
S
4.3
i--Z-'�j�
3.9
3.4
).9
2.
2.9 2.:3
,.
70%
7.0
8.1
6.0
7.0
6.0
5.5
5.0
4.5
4.6
4.6
3.0
i
3.4 2:8,
80$
9.4
8.0
7.0
6.4
5.7"
6.. 5"
5.2
5.9
5. 2
.4.0
4. 6
3 .9 3: 3'
9 0 0
10 .7
9. 0
7. 9
7. 2
T.3.
6.6
5.8
5.1
4.3 3.6
1000
12.0
10:0
8.8
8.1
3oTM-rn .e,0v cG-Kj
C
4 g56 7

Hanover Design Services, P.A. SEP 15 1994
Land Surveyors & Land Planners
September 13, 1994
Ms. Linda Lewis, Environmental Engineer
Department of Environment, Health and Natural Resources
Division of Environmental Management
127 Cardinal Drive Extension
Wilmington, NC 28405-3845
Re: Williamsburg Place at Northchase
New Hanover County
Stormwater Project No. SW8 940820
Dear Ms. Lewis:
In response to your request for additional information dated
September 12, on the above project, please find attached a
revised Erosion and Sediment Control Plan and a revised set of
sealed computations. As to your individual concerns:
1. I have now received a copy of the architect's drawings
and am enclosing a copy for dimensions, with area
calculations revised ( please see new tabulations ).
2. Please find revised calculations based on 50% impervious,
WSEL= 27.0 and Pond Bottom elev= 21.50.
3. I have included the additional green area in the volume
calcs. as requested. This area had been accounted for in
the TR-20 runs but not in the impervious comps. I
calculated 14,135 CF but will use 15,000 CF to be over
your estimate.
4. I have revised the pool area tabulation to 2,205 SF.
5. I have revised the pool SA/DA calculation to reflect the
90% TSS chart. The outflow will go to a vegetatively
stabilized ditch, but because it is in the control of
Northchase I will not include the spreader detail.
I have revised the Project Data Sheet to reflect 50% built upon
area of 145,000 SF. I hope this will resolve the area
considerations. I hope this additional information will be
sufficient to allow you to complete your review. If you have any
questions about the revisions or addition material, please call.
Thanks for your attention to this matter. TO
`1�����n �
Ift- --
Sincerely,
David S. Hollis, PE
Attachment
REcE`UD
SEP 1 5 1994
D E M
PROJ
The Cotton Exchange 321 North Front Street Wilmington, N.C. 28401 [phone]

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
September 12, 1994
Mr. David Hollis, P.E.
Hanover Design Services
321 North Front Street
Wilmington, North Carolina 28401
Subject: ADDITIONAL I "I ORMATION
Stormwater Project No. SW8 940820
NorthChase-Williamsburg Place
New Hanover County
Dear Mr. Hollis:
The Wilmington Regional Office received a Stormwater Submittal for the NorthChase-
Williamsburg Place on September 8, 1994. A preliminary review of that information has determined that
the submittal for the subject project is not complete. The following information is needed to continue
the stormwater review:
1. If you will only provide a "generous" amount for the buildings, and not provide specific
dimensions, I must go by what the buildings scale off on the plans, which is a total of
85,940 square feet. Please dimension the buildings.
2. In your calculations, you indicate that 9,300 square feet has been provided in surface area.
The numbers in the tables are used to find the required surface area at the permanent
pool, not the temporary storage elevation. Additionally, pond depth is measured below
permanent pool, not from the temporary storage elevation. You must provide, by my
calculations, 11,794 square feet of surface area at elevation 27.0, based on 49 % impervious
and a 3 foot pond depth.
3. The 3.4 acres of green area has still not been accounted for in the volume calculation. You
clearly state in the Water Quality Considerations portion, that retention of the first 1" of
runoff required is equal to 3.2 x 1/12 = 11,500 cubic feet. The volume of runoff from
the green areas of this site that contribute to the pond must be added in. (ie. , ((3.22 x .98)
+ (3.4 x .2)) _ 12 x 43,560 - 14,700 CF.
4. Please see the attached plan. Is the area denoted in pink concrete? Is it part of the 1,600
square feet you have accounted for?
127 Cardinal Drive Extension, Wilmington, N.C. 2MS-3845 • Telephone [phone] Fax [phone]
An Equal Opportunity Affirmative Action Employer

Mr. Hollis
September 12, 1994
Stormwater Project -No. SW8 940820
5. I now see that the surface area is based on the 85% TSS chart, which means that a 30'
vegetative filter is required at the outlet pipe release point. Please locate this filter on the
plans and provide a detail, including the flow spreader device. (See attached detail, for
information only)
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 October 9, 1994, or the submittal will
be returned as incomplete.
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\940820.SEP
cc: �(2) Linda Lewis
Central Files

Hanover Design Services, P.A.
1
Land Surveyors & Land Planners
September 6, 1994
Ms. Linda Lewis, Environmental Engineer
Department of Environment, Health and Natural Resources
Division of Environmental Management
127 Cardinal Drive Extension
Wilmington, NC 28405-3845
Re: Williamsburg Place at Northchase
New Hanover County
Stormwater Project No. SW8 940820
Dear Ms. Lewis:
In response to your request for additional information on the
above project, please find attached a revised Erosion and
Sediment Control Plan, a Site Plan and a revised set of sealed
computations. As to your individual concerns:
1. I have enclosed a copy of the Site Plan showing the
t5' building footprints in greater detail. I don't have the
u�(y �`� exact dimensions but a generous estimate of the area is
'0 \ (�' 1350 SF for the end units and 1300 for the interior ones.
This would include decks, patios, and the garages.
er �k �h /2. I have estimated 15' of 31wide sidewalk per unit in the
4 50 revised impervious calcs.
y\t ✓3. I have drawn the contours of the pond in greater detail
on the plan and labelled the permanent pool and 1"
storage contours as requested. You should be able to
verify the area more readily now.
✓4. I have revised the outlet detail to show the oriface pipe
elbowing downward 8" to reduce the likelihood of
clogging. With the perforations and filter, positive flow
should ensue even with minor clogging.
✓5. A note has been placed on the revised plan to the effect
that all drainage from impervious surfaces shall be
directed to the roadway system to be picked up by the
pond.
TER
n���Od�lnl
lu�(� SEP 0 8 1994 U
D E M
FROJ 52,8 Roo F20
The Cotton Exchange 321 North Front Street Wilmington, N.C. 28401 [phone]

Calculations:
1. Attached please find revised calcs. showing % impervious,
required surface area, depth, and TSS removal rate.
2. Please note the revision to the outlet structure detail.
The pond bottom is at elev= 24.0 and the permanent pool
at elev= 27.0. The required storage occurs at elev= 28.8
with a surface area of 9,300 SF. I hope that the more
detailed contour mapping will facilitate your
verification.
3. I have accounted for 6.6 acres into the pond. All
quantity analysis for pond routing ( 10-year and 100-year
events ) is based on the overall drainage area.
4. This was my mistake. The property area is 6.64 acres and
not 5.47 as I misstated. As you can see by the more
detailed impervious accounting, the Parkway and all
offsite areas are included. This did not affect any
individual drainage area or impervious surface
computations.
5. The southern half of the Parkway for about 865 LF will
drain into the pond. I have accounted for this in the
impervious calcs.
6. I show that the pond surface area is adequate with
9,300 SF of surface area for a requirement of 8,050 SF.
7. The concrete decking around the pool has been accounted
for. Please see the more detailed impervious accounting.
8. I have enclosed a revised, sealed copy of the calcs.
General:
1. Enclosed please find the signed O&M Plan.
2. I have put my name and Hanover Design Services, P.A. on
the submittal as requested.
I hope this additional information will be sufficient to allow
you to complete your review. If you have any questions about the
revisions or addition material, please call me.
Thanks for your attention to this matter.
Sincerely,
David S. Hollis, PE
Attachment

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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
August 30, 1994
Mr. David Hollis, P.E.
Hanover Design Services
321 North Front Street
Wilmington, North Carolina
Subject: ADDITIONAL INFORMATION
Stormwater Project No. SW8 940820
NorthChase - Williamsburg Place
New Hanover County
Dear Mr. Hollis:
The Wilmington Regional Office received a Stormwater Submittal for the NorthChase -
Williamsburg Place on August 19, 1994. A preliminary review of that information has determined that
the submittal for the subject project is not complete. The following information is needed to continue
the stormwater review:
PLANS
1. Add dimensions to a typical unit footprint for each type of building. Denote uncovered
wood decks, stone patios, etc.
2. Will there be any sidewalk from the driveway to the front door? Please provide locations
k5 ;Aa and width. If sidewalk is proposed and has not been accounted for in impervious area
'! calculations, please revise accordingly.
,/3. Label and delineate the permanent pool and 1" storage pond contours. Please make sure
that the area you show in contour matches up with what you say is being provided. I must
be able to verify the areas.
l/4. The outlet structure detail shows a flat slope on the orifice pipe. Generally, to avoid
unnecessary clogging problems, the orifice is angled so that the inlet end is approximately
12" below the water surface. See calculation comment number 2.
t/5. Please note on the plans that all drainage from impervious surfaces must be directed into
the road system to be picked up by the pond.
127 Cardinal Drive Extension, Wilmington, N.C. 28405-3845 • Telephone [phone] • Fax [phone]
An Equal Opportunity Affimutive Action Employer

Mr. Hollis
August 30, 1994
Stormwater Project No. SW8 940820
CALCULATIONS
✓ I. Please provide calculations of the percent impervious of the site and the required surface
area of the pond based on percent impervious, depth, and TSS removal rate.
2. According to the outlet structure details, the pond bottom is at 27.0, which is also where
ham` n you have set the orifice invert. The regulations require a minimum 3' of depth BELOW
the permanent pool elevation, with the corresponding minimum surface area available at
the permanent pool elevation. Storage of the volume associated with 1" of runoff occurs
r° ABOVE the permanent pool. Enclosed is the SA/DA table for your use. What is the
t� surface area you are providing at the 1" storage elevation? I cannot verify the 5,000
square feet you list as the surface area available at elevation 27.0.
3. You have not accounted for the 3.4 acres of green area that will contribute volume to the
pond.
4. The submittal form indicates a project area of 5.47 acres, while the calculations show 6.6
acres. I think the difference comes from the fact that Drainage Area IV does not include
�1,� all of the property. It is required, in order to meet regulations, to figure the required pond
surface area based on the total impervious area percent within the property lines, and to
figure the required pond volume above permanent pool based on the impervious surfaces,
and on any off -site drainage and green areas that drain to the pond.
U('' �C, 5. Will a portion of NorthChase Parkway drain into this pond? DA-I'and DA-Il appear to
include a portion of the Parkway.
6. The pond is deficient in surface area.
0 5��/7. Is concrete planned around the swimming pool? There are areas marked with blue lines
that I think are meant to denote a concrete deck around the swimming pool. Please clarify.
a
v,' 8. Calculations must be sealed by a North Carolina Professional Engineer.
GENERAL
Z 1. A signed and notarized Operation and Maintenance Plan. (Example enclosed)
V,� 2. Please place your name and address in the space on the submittal form as the authorized
person to submit stormwater plans on behalf of Mr. Dean Potter.

1�
Mr. Hollis
August 30, 1994
Stormwater Project No. SW8 940820
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 30, 1994, or the submittal
will be returned as incomplete.
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\940820.AUG
cc: <(2)" Linda Lewis
Central Files
3

POND MAINTENANCE REQUIREMENTS
Project Name: Project No.
Responsible Party: Phone No.
Address:
I. Inspect monthly, or after every runoff producing rainfall event, whichever comes first
A. Remove debris from the trash rack.
B. Check and clear the orifice of any obstructions. If a pump is used as the drawdown
mechanism, pump operation will be checked. A log of test runs of the pump will be kept
on site and made available to DEM personnel upon request.
C. Check the pond side slopes; remove trash, and repair eroded areas before the next rainfall
event.
D. If the pond is operated with a vegetated filter, the filter will be checked for sediment
accumulation, erosion and proper operation of the flow spreader mechanism. Repairs will
be made as necessary.
U. Quarterly
A. Inspect the collection system (ie. catch basins, piping, grassed swales) for proper
functioning. Accumulated trash will be cleared from basin grates, basin bottoms, and
piping will be checked for obstructions.
B. Pond inlet pipes will be checked for undercutting, riprap will be replaced, and broken
pipes will be repaired.
C. Grassed swales, including the vegetated filter if applicable, will be reseeded twice a year
as necessary. Eroded areas will be repaired immediately.
M. Every 6 months
A. Accumulated sediment from the bottom of the outlet structure will be removed.
B. The pond depth will be checked at various points. If depth is reduced to 75 % of original
design depth, sediment will be removed to at least the original design depth.

POND MAINTENANCE REQUIREMENTS
PAGE 2
IV. General
A. Mowing of the side slopes will be accomplished according to the season. Maximum grass
height will be 6".
B. Cattails are encouraged along the pond perimeter, however they will be removed when they
cover more than 1/2 the surface area of the pond.
C. The orifice is designed to draw down the pond in 2-5 days. If drawdown is not
accomplished in that time, the system will be checked for clogging. The source of the
clogging will be found and eliminated.
D. All components of the detention pond system will be kept in good working order. Repair
or replacement components will meet the original design specifications as per the approved
stormwater plan.
V. Special Requirements
I, , hereby acknowledge that I am the financially
responsible party for maintenance of this detention pond. I will perform the maintenance as outlined
above, as part of the Certification of Compliance with Stormwater Regulations received for this project.
Signature: Date:
I, , a Notary Public for the State of
County of , do hereby certify that
personally appeared before me this day of , 19_, and acknowledge the
due execution of the foregoing instrument. Witness my hand and official seal,
SEAL
My commission expires.
DA/arl: S:\WQS\STORMWATIFORMS\O&M-POND.FOR

BUFFER AREA
Is the built upon area at least 30 feet from mean high water of all surface waters? Y e s If no, please
provide a description
(Note: Only boat ramps, public roads, public bridges, and walkways to water related facilities are allowed
within 30 feet of the mean high water line if the project is intended to meet stormwater control
requirements through density limits.)
DEED RESTRICTIONS AND PROTECTIVE COVENANTS
By my signature below, I certify that the recorded deed restrictions and protective covenants for this project
shall limit the allowable built -upon area l to 138 , 000 square feet inclusive of right-of-way,
structures, pavement, walkways or patios of brick, stone, or slate, not including wood decking, state that
the covenants will be binding on all parties and persons claiming under them, that they will run with the
land, and that benefits may be enforced by the State of North Carolina, therefore, the covenant cannot be
changed or deleted without consent of the State. No one may fill in or pipe any of
the swales shown on the approved plan.
CERTIFICATION�%%
I, �1/GA/� /D //�%� certify that the information included on this
submittal form is correct, that the project will be constructed in conformance with this information, and
that to the best of my knowledge, the proposed project complies with the requirements of 15 NCAC
2H.1003 (b). I authorize the below named person or firm to submit siormwater plans on my behalf, and
agree to abide by the deed restr on statement above.
iTe,
Owners Signature Date
Provide authorized person or firm name and address below:
P. Dean Potter, President
Gateway, Inc.
304 Snug Harbour Drive
Wilmington, NC 28405
I Mary C. Grimshaw ,a Notary Public for theState of _North Car
County of New Hanover do hereby certify that P. 'te.r
appeared before me this t day of August �;9k'' g aCkri6wledl
of the foregoing instrument. Witness\my hand and official seal, — a
My commission expires
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Regional Office
Date Individual Evaluating Forms/Plans
Date
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personally
the due execution
cc: Applicant/WiRO/Bradley Bennett/Central Files

HANOVER DESIGN SERVICES, P.A.-
The Cotton Exchange
321 N. Front Street
WILMINGTON, NORTH CAROLINA 28401
[phone]
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EROSION AND SEDIMENT CONTROL PLAN
NORTHCHASE APARTMENTS
for Gateway Development, Inc.
AUGUST, 1994
NARRATIVE
NOTE: To be reviewed in conjunction with "Erosion and Sediment
.Control Plan for Northchase Apartments", Hanover
Design Services, P.A., Drawing No. 2940B-SC-94DH.
PROJECT DESCRIPTION -
The purpose of this project is to construct a residential
community of duplex and triplex buildings 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 N.C. Highway 132 and Northchase
Parkway West, in New Hanover County, and is approximately
5.469 acres in size, of which about 4.5 acres are proposed to
be disturbed. The site is wooded over
gently sloping to flat topography. I
SOILS -
t
The soil in the project area is primarily a Murville
complex ( Mu ); loamy fine sand that is moderately to poorly
drained, rapidly permeable, with an erosion "K" factor of
0.10, moderate to severe erodibility. The hydrologic
classification of the soil is A/D. Because of the flat
topography, wide, vegetatively stabilized channels will be the
primary means of stormwater transport on and across the site
to the proposed pond/ basin. Because of wetness associated
with this soil type, care must be taken to maintain roadway
and channel slopes to the pond/ basin.
(Soils Map attached)