SW8900910_Historical File_19901026

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Project #: 900910 File Name: DET910
Reviewer:ALexis Finn
Project Name: CAROLINA OB GYN
Date:
10/26/90
******************DETENTION POND ANALYSIS************************
POND AREA MEASUREMENTS: TRACT I
------------------------------
Total Drainage Area, DA:
DA=
40050
ft^2
##
IDA (acre)) / 143560 ft^2/acre)=
DA=
0.919421
Acres
IMPERVIOUS SURFACE AREA CALCULATIONS:
Structure Surface Area, A
Runoff Coef., C
sf
Impervious Surface: 38047.5
1.00 Adjusted Surface
Area = A * C =
38047.5
ft^2
##
Green Areas: 2002.5
0.2 Adjusted Surface
Area = A * C =
400.5
ft^2
##
TOTAL:
38448
ft^2
##
Percent Impervious, %I:
ESA/DA3*100=
E 38047.5 / 40050 1*100= %I= 95.00%%
Note: If %I < 30% check Density Option.
If %I > 30%, require engineered system to minimize non -point stream degradation.
POND SIZING:
------------
Minimum Required Storage Volume, VOLreq: note: SA has been multiplied by runoff coefficients
ESA (ft^2) * 0 inch of runoff) * 0 ft/12 inch))=
E 38448 ft^2 * 1 inch * 0.083333 ft/inch)= VOLreq= 3204 ft^3
##
POND SIZING:
------------
Bottom Elevation, ELb:
Permanent Pool Elevation, ELpp:
Area of
Permanent Pool, App:
Storage
Pond Elevation, Esp:
Area of
Storage Pond, Asp:
Runoff
Storage Depth, d:
(via project engineer's design:
d
ELsp - ELpp)
Storage
Volume Provided, VOLpro:
Side Slope:
3:1 ####
Volume 1, V1= App * d =
2730
ft^2 * 1
ft -
Volume 2, V2= (Asp - App) *
d * 0.5 =
VOLpro = V1 + V2 =
2730
ft^3 + 322.5
ft^3
Note:
VOLreq > VOLpro; However within
5%,
therefore Pond Size is Acceptable.
-----
% Excess Storage=(VOLreq /
VOLpro)
* 100
% Excess Storage =
ELb =
5 ft
##
ELpp=
10 ft
##
App =
2730 ft^2
##
ELsp=
11 ft
##
Asp =
3375 ft^2
##
d=
1 ft
##
V1=
2730 ft^3
V2=
322.5 ft^3
VOLpro=
3052.5 ft^3
-4.96%< --------

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LF- TTER Off` TRANSMITTAL
ANDREW & KUSKE
CONSULTING ENGINEERS, INC.
202 North Fifth Avenue
Wilmington, North Carolina 28401
Telephone: [phone]
John R. Andrew, P.E.
J. A. Kuske, P.E.
TO:
- Y�PaK- QL1Al1z4
WE ARE SENDING YOU
❑ Shop Drawings
❑ Copy of letter
DATE iO-Z4-9b
JOB NO. 4:1106a
1
ATTENTION
uEXis
F w�!
SUBJECT:
[/J�
A-rt� KIWI T l
p
-.E�ll5E0
evn�T�-A
FAX NUMBER 919-343-9604
TOTAL PAGES SENT::
Please call 919-343-9653 should you
have difficulty receiving.
LrJ Attached ❑ Under separate cover via the following items:
(Z"Prints ❑ Plans
❑ Change Order ❑
❑ Samples ❑ Specifications
COPIES
DATE
NO.
= DESCRIPTION
at P114-A
�Z
OETAIL&
THESE ARE TRANSMITTED as checked below:
For approval ❑ No exceptions taken
❑ For your use [:]Make corrections noted
❑ As requested ❑ Amedd-`and resubmit
❑ For review and comment ❑
❑ FOR BIDS DUE 19
REMARKS:
a � 1990 —
D E M 900910
PW,Rftete¢ - See.Remahks
❑ Returned for corrections
[] Ret.urn corrected prints
❑ PRINTS RETURNED AFTER LOAN TO US
Y i fijFlsfc -T ho (-1 S 2 yOy2
M90 Commca--- &A esxrw QS
W try A Md
Qli�4rlo►1S oL l�ammP,.iTS.
�FAtiUc
c c
Signed:

Date Design Andrew and Kuske LSheetto-n-`to FT 202 N. Fifth Ave. CONSULTING ENGINEERS, INC. Wilmington, N.C. 28401 Of Z.
Check Job catr0tAA4- b e6'lW'Q- For Job No.
;�M2MWRW_ C,t Les. �H�uNA OB-�yA� �--10I58
NTEATk2&I Rp4b EXn,4-soAA
[acT �m�E2V�ous AMA = 95°10 o- nttcA
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4, 555 FT-'
USE 5o�
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Row Poor. 11, b
4Ektq C" 9W FT"" a }�a¢MiaL Pool
ST " Q-ONOw- a4Em lmpEe (0)s A2.4.A = IlZ x 'o 1 6155 =
dEEA 3-2,50 FT3 pftq£- pE.emfq"f"T root- SIDE SwPes
-j1iaCAC.ra peiA of P-40 E,c.E,•(. 30= FT"
I► a = 3850 'PTI-
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3¢Z6 FT 3
34M cVIM, � 3-5so Fri oK
wU V E 0. V k D }
190
DEM
PROJ

Date
10-CB-90
Design
9;"r
Andrew and Kuske
_ 202 N. Fifth Ave, CONSULTING ENGINEERS, INC. Wilmington, N.C. 28409
Sheet
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Check
Job
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f! 1990
DEM
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use 14' x1Co` Y, Iz"

State of North Carolina
Department of Environment, Health, and Natural Resources
Wilmington Regional Office
James G. Martin, Governor Bob Jamieson
William W. Cobey, Jr., Secretary Regional ManagerOctober 12, 1990
DIVISION OF ENVIRONMENTAL MANAGEMENT
Mr. J. Phillip Norris, P.E.
Andrew & Kuske Engineers, Inc.
202 North Fifth Street
Wilmington, North Carolina 28401
Subject: Additional Information
Stormwater Project No. 900910
Carolina OB GYN
New Hanover County
Dear Mr. Norris:
The Wilmington Regional Office received a Stormwater submittal
for the Carolina OB GYN on September 25, 1990. A preliminary
review has determined that the submittal for the subject project
is not complete. The following information is needed to continue
our review:
As Tract II is less than 1 acre, it is considered an
outparcel by this Office. Therefore, either restrictive
covenants are needed or Tract II must be included in the sizing
of the detention pond. Per the Third Directive (copy attached)
the detention pond sizing would account for the ultimate
build -out potential (i.e. 100% impervious coverage), thus, the
detention pond is undersized as it is now designed.
✓ 2. The Professional Engineer stamp on the plans must be
signed and dated.
/ 3. A vicinity map is requested.
Continued
7225 Wrightsville Avenue, Wilmington, N.C. 28403-3696 0 Telephone [phone] Fax [phone]T).

Mr. Norris
October 12, 1990
Page Two
----------------
This information should be received by this Office no later than
November 12, 1990, or the subject file will be closed and
construction may experience subsequent delay. If you have any
questions, please call me at telephone number [phone].
sincerely,
Alexis I. Finn
Environmental Engineer
AIF: 900910.00T
cc: Bill Mills
(2) Alexis Finn
Central Files

ENGINEERING
WYATT E. BLANCHARD, P.E.
County Engineer
October 5, 1990.
NEW HANOVER COUNTY
ENGINEERING DEPARTMENT
414 CHESTNUT STREET
WILMINGTON; NORTH CAROLINA 28401
TELEPHONE [phone].
Mr. Reuben A. Allen, Jr.
Reuben Allen and Associates
1920 Tradd Court
Wilmington, NC 28401
RE: Grading Permit G.P. 34-90
Carolina Ob-Gyn
Dear Mr. Allen:
p ECEIV1 UD
1 4 1991
OEM
rRoJ 0
This office has reviewed the subject sedimentation and. erosion
control plan. We find the plan to be acceptable. HOWEVER; ,THIS
IS NOT A GRADING PERMIT.
Please be advised that a copy of the approved soil erosion plan
and a copy of issued grading permit must be available at all
times at the site.
New Hanover County's Soil Erosion and Sedimentation control
program is performance oriented. Requiring protection of the
natural resources and adjoining properties. If following the
commencement of the project it is determined that the plan is
inadequate to meet the requirements of the New Hanover' County
Soil Erosion and Sedimentation Control Ordinance, this office may
require revisions in the plan and its implementation to insure
compliance with the ordinance.
Recognizing the desirability of early coordination of
sedimentation and erosion control, I would like to arrange a
pre -construction conference with owner/agent, grading contractor,
engineer, and myself. Proceed with the placement of the planned
erosion control measures; these will be inspected at the
pre -construction conference. Please contact this office to set
the date of the pre -construction conference at which time you
shall be issued the grading permit. However, this permit will
not preclude any other permits or approvals necessary for
beginning or completing this development. t
RECEIVED
OCT 10199U
Wilmington 9.60 OI use
OEM
11

Mr. Reuben A. Allen, Jr.
Page Number Two
October 5, 1990
Erosion control measures to be installed prior to grading:
(1) All slopes to be on 3' (run) to 1' (rise) ratio.
(2) All State drainage requirements are adhered to.
(3) Silt fence to be installed as needed and a buffer must be
maintained.
(4) Construction exit to be located where construction traffic
encounters a paved surface,(per plans).
I look forward to working with you on this project.
Sincerel ,
Jim Craig
Cam ervation Engine r
New Hanover County
JC/dal
cc: Phil Tripp, A & K'Engineers
Steve Saieed, Miller Building
Alexis Finn, D.E.M.
Jeff Richter, Corps of Engineers
Karen Williamson, City Parks and Rec
Chuck Holden, City Zoning
Jimmy Parker, City Engineering
Karen Daniels, Inspections
a

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-

Andrew & Kuske CONSULTING ENGINEERS, INC. 202 North Fifth Avenue P.0, 9
Box Box 28888 28459
Wilmington, North Carolina 28401
John R. Andrew, P.E. Telephone: [phone] Telephone: [phone]
J. A. Kuske, P.E. Facsimile: 919/343-9604
September 19, 1990
North Carolina Department
of Environment, Health
and Natural Resources
Division of Environmental Management
Water Quality Section
7225 Wrightsville Ave.
Wilmington, NC 28403
Attn: Ms. Alexis Finn
Re: Carolina Ob Gyn
Wilmington, NC
A&K Project No. 90158
Stormwater Management Plan
Dear Ms. Finn:
Enclosed please find one print of the subject plan,
calculations and stormwater maintenance schedule. We have
also enclosed the name and address of the owner. We have
submitted the erosion control plan to New Hanover County for
approval.
Please review for approval and contact me should you have any
questions or comments. Thank you for your assistance on this
project.
Sincerely,
ANDREW & KUSKE
CONSULTING ENGINEERS, INC.
a--o ff, ,
Phillip G. Tripp
Project Engineer
PGT/jmc
enclosure
cc: Steve Saieed/Miller Bldg
0. E ill,
-° Cao9io
LU

1.
2.
STORMWATER MAINTENANCE SYSTEM
MAINTENANCE PROCEDURES
FOR
CAROLINA OB-GYN
A & K Project No. 90158
RESPONSIBLE PARTY
A. The project will be built and maintained by:
Tidewater II Partnership
2215 Canterwood Drive
Wilmington, NC 28401
[phone]
DETENTION POND
A. The detention pond will be checked after every major
storm event to insure that the outlet structure is
working properly and is not clogged with debris.
Remove any accumulated sediment or debris. Any signs of
erosion or deterioration of the pond side slopes or any
other feature must be repaired before the next storm
event.
B. The depth of the pond will be checked every six months
to determine the depth of the permanent pool. The pond
will be cleaned out when silt deposits reduce the depth
of the permanent pool below 3 ft.
3. CERTIFICATION
The Owner will submit to the Department of Environment Health
and Natural Resources an Engineer's Certification that the
stormwater facilities were constructed in accordance with
approved plans.
signature date
fir. D.6 • '8"un1 D E M
it
�,�

Andrew and Kuske
CONSULTING ENGINEERS, INC.
202 North Fifth Avenue
Wilmington, North Carolina 28401
John R. Andrew, P.E.
J. A. Kuske, P.E. Telephone [phone]
September 19, 1990
TO: N.C. Division of Environmental Management
attn: Ms. Alexis Finn
RE: Carolina Ob Gyn
Wilmington, NC
A&K Project No. 90158
Please note the following name and address for the Owner
of the subject project.
TIDEWATER CORPORATION
2215 Canterwood Drive
Wilmington, NC 28401
0PhA1 G. Trip
Project Engineer
PGT/jmc
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Date Design �
Andrew and Kuske Sheet
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Date Design Andrew and Kuske meet
9N.C.
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:a f>II ,- 202 N. Fifth Ave. CONSULTING ENGINEERS, INC, Wilmington, N.C. 28401 3 Of
Check Job For Job No.
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Project #: 900910 File Name:
DET910
Reviewer:ALexis Finn
Project Name: CAROLINA OB GYN
Date:
10/10/90
******************DETENTION
POND ANALYSIS************************
POND AREA MEASUREMENTS:
------------------------------
TotaL Drainage Area, DA:
DA=
65740 ft^2
##
[DA (acre)] / [43560 ft^2/acre]=
,
DA=
1.509182 Acres
IMPERVIOUS SURFACE AREA CALCULATIONS:
Structure Surface Area, A Runoff
Coef., C
sf
Buildings: 12908
1 Adjusted Surface Area
= A * C =
12908 ft^2
##
Parking/sidewalks/streets: 36315
0.95 Adjusted Surface Area
= A * C =
34499.25 ft^2
##
Green Areas: 16517
0.2 Adjusted Surface Area
= A * C =
3303.4 ft^2
##
TOTAL:
50710.65,ft^2
##
Percent Impervious, %I: note: SA=(BUILDING + PARKING..)= 49223 sf
11tiv1'
40
0

(SA/DAI*100=
( 49223 / 65740 3*100= %I= 74.88%%
Note: If %I < 30% check Density Option.
POND SIZING: If %I > 30%, require engineered system to minimize non -point stream degradation.
Minimum Required Storage Volume, VOLreq: note: SA has been multiplied by runoff coefficients
ESA (ft^2) * (1 inch of runoff) * (1 ft/12 inch)]=
( 50710.65 ft^2 * 1 inch * 0.083333 ft/inch]= VOLreo= 4225.887 ft^3
POND SIZING:
------------
Bottom Elevation, ELb:.
ELb = 6 ft ##
Permanent Pool Elevation, ELpp:
ELpp=
Area of
Permanent Pool, App:
App =
Storage
Pond Elevation, Esp:
ELsp=
Area of
Storage Pond, Asp:
Asp =
Runoff Storage Depth, d:
(via project engineer's design: d =
ELsp - ELpp)
d=
Storage
Volume Provided, VOLpro:
Side Slope:
3:1
####
Volume 1, V1= App * d = 4724
ft^2 * 1
ft
V1=
Volume 2, V2= (Asp - App) * d * 0.5
=
V2=
VOLpro = V1 + V2 = 4724
ft^3 + 694.5
ft^3
"fmppoue
Note:
VOLreq 4-1pic, zx dss Storage is
avaiLabh Q, tr^refcre Pon-j
Size is Acceptable.
-----
% Excess Storage=(VOLreq / VOLpro)
* 100
% Fxaea tarage
DETENTION POND ANALYSIS CONTINUED: PAGE TWO
PERMENANT POOL:
Perm. Pool at Normal Level= 10 ft
Bottom of Pond = 6 ft
Depth Provided, D = 4 It <----- Okay, depth > OR = 3 ft.
SA/DA CALCULATION:
By Chart #4; 8 90% TSS:
Depth, D = 4 ft
% impervious = 74.88%
DA = 1.509182 Acres
SA/DA % = 6.5 ####
Area of Permanent Pool Required = (SA/DA %) * DA
10 ft ##
4724 ft^2 ##
11 ft ##
6113 ft^2 ##
1 ft ##
4724 ft^3
694.5 ft^3
5419,5 ft"3

Area of Permanent Pool Required =
6.5 * 1.509182 Acres
Area of Permanent Pool Required =
0.098096 Acres
Area of Permanent Pool Required =
4273.1 ft^2
Area of PERMANENT POOL Required--
4273.1 sf < provided area of
ORIFICE / OUTLET SIZING:
VOLpro = 5418.5
Orifice outflow, 2 Day Drawdown = Volpro/[(2 day) * (86400 sec/day)]
Orifice outflow, 2 Day Drawdown = 5418.5 ft^3 / 172800 sec =
Orifice C.S. Area, A:
A= 0/[Cd((2gh)^0.5))3
4724 sf <--OKAY: sufficient storage area
Q2= 0.031357 cfs
A= 0.031357 / [0.6*((2*32.2*1.0)AO.5))3= A2=
A2=
Pipe diameter, d: d2=
Note: Head, h = maximum pond level - permanent pond level =
Coeficient of Discharge, Cd = 0.6
Orifice outflow, 5 Day Drawdown = Volpro/[(5 day) * (86400 sec/day)]
Orifice outflow, 5 Day Drawdown = 5418.5 ft^3 / 432000 sec = 05=
Orifice C.S. Area, A:
A= Q/[Cd((2gh)AD .5))]
0.006512 ft^2
0.937785 inch^2
1.092714 inch
1 ft
0.012542 cfs
A= 0.012542 / [0.6*((2*32.2*1.0)^0.5))3= A5= 0.002604 ft^2
A5= 0.375114 inch^2
Pipe diameter, d: d5= 0.691093 inch
UKK� e dpravidzdd < Q7 0,7 < ?.0 < `lot <------ OKAY ... a Orifice is sized correctly.

LETTER OF TRANSMITTAL
ANDREW & KUSKE
CONSULTING ENGINEERS, INC.
202 North Fifth Avenue
" Wilmington, North Carolina 28401
lephone: [phone]
John R. Andrew, P.E.
J. A. Kuske, P.E.
TO: D,C—. K.
DATE r ,5 �(��
JOB NO.
ATTENTION %
SUBJECT:
FAX NUMBER 919-343-9604
TOTAL PAGES SENT:
Please call 919-343-9653 should you
have difficulty receiving.
WIE ARE SENDING YOU Attached ❑ Under separate cover via
❑ Shop Drawings ❑ Prints ❑ Plans ❑ Samples
[] Copy of letter ❑ Change Order ❑
the following items:
❑ Specifications
r%r-Av►r-n rrw:
COPIES
DATE
NO.
DESCRIPTION
JAN 19 1993
Wilmington Regionai office
DEM
JAN 2 ' 1993
DEIV]
qcc) 910
THESE ARE TRANSMITTED as checked below:
❑ For approval
❑ For your use
❑ As requested
❑ For review and comment
❑ FOR BIDS DUE
REMARKS:
❑ No exceptions taken
❑ Make corrections noted
❑ Amend and resubmit' -
El
19
❑ Rejected See Remarks
❑ Returned for corrections
❑ Return corrected prints
L1 PRINTS RETURNED AFTER LOAN TO US
c c . <-::; Z Signed:

A '►
Engineer's Certification
I, PHILUP �. 12►f+P , as a duly registered
Professional Engineer in the State of North Carolina, having been
authorized to observe (periodically the
construction of the project,
&O.OUI'An p6-�Yr,l
(Project)
6alm►�ML �AGUT1{S-
_ �f oo91p)
for the I IMV4 Ty- M Hqe--r'-*�%p hereby state that, to
(Project Owner)
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 li 3Z�
Date I. 1� • G
CRRO
Il�,�9ePs
K
' SEAL �
a
.11374. o
o '1 J°aa E' r' eee•Q� e
d� jj� °�sa.00ceoa `0�
Je}'�FtiO+llCL���,
U L6 U is u ti L4 bu
UA
JAN 2 1 1993
D E M