SW7000108_CURRENT PERMIT_20010810

STORMWATER. DIVISION CODING SHEET
POST -CONSTRUCTION PERMITS
PERMIT NO.
SW 7�/!fig
^,. - -
DOC TYPE
CURRENT PERMIT
❑ APPROVED PLANS
❑ HISTORICAL FILE
DOC DATE
a220 C_
YYYYMMDD

NNArF,,pG
"RO
Michael F. Easley
Governor
>1 William G. Ross Jr., Secretary
0 Department of Environment and Natural Resources
Gregory J. Thorpe, Ph.D., Acting Director
Division of Water Quality
DIVISION OF WATER QUALITY
August 10, 2001
Bertie County Board of Commissioners
Attn: Ms. Patricia Ferguson
P.O. Box 530
Windsor, NC 27983
Subject: Stormwater Permit No. SW7000108
Bertie Memorial Hospital
High Density Stormwater Project
Bertie County
Dear Ms. Ferguson:
The Washington Regional Office received the completed
Stormwater Application for the subject project on July 31, 2001.
Staff review of the plans and specifications has determined that
the project, as proposed, will comply with the Stormwater
Regulations set forth in Title 15A NCAC 2H.1000. We are forwarding
Permit No. SW7000108 dated August 10, 2001, to the Bertie County
Board of Commissioners.
This permit shall be effective from the date of issuance until
August 10, 2011 and shall be subject to the conditions and
limitations as specified therein. Please pay special attention to
the Operation and Maintenance requirements in this permit. Failure
to establish an adequate system for operation and maintenance of
the stormwater management system will result in future compliance
problems.
.If any parts, requirements, or limitations contained in this
permit are unacceptable, you have the right to request an
adjudicatory hearing upon written request within thirty (30) days
following receipt of this permit. This request must be in the form
of a written petition, conforming to Chapter 150B of the North
Carolina General Statutes, and filed with the Office of
Administrative Hearings, P.O. Drawer 27447, Raleigh, NC 27611-7447.
Unless such demands are made this permit shall be final and
binding.
943 Washington Square Mall Washington, NC 27889 252-946-6481 (Telephone) 252-946-9215 (Fax)

Bertie County Board of Commissioners
August 10, 2001
Page Two
If you have any questions, or need additional information
concerning this matter, please contact Bill Moore at (252) 946-
6481, extension 264.
Sincerely,
,j-,7im Mulligan
Water Quality Regional Supervisor
Washington Regional Office
cc: HDR Architecture, Inc
Bertie County Inspections
Washington Regional Office
Central Files

State Stormwater Management Systems
Permit No.S.W7000108
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIROMMNT AND NATURAL RESOURCES
DIVISION OF WATER QUALITY
STATE STORMWATER MANAGENENT PERMIT
HIGH DENSITY DEVELOPMENT
In accordance with the provisions of Article 21 of Chapter 143,
General Statutes of North Carolina as amended, and other applicable
Laws, Rules, and Regulations
PERMISSION IS HEREBY GRANTED TO
Bertie County Board of Commissioners
Bertie County
FOR THE
construction, operation and maintenance of stormwater management
systems 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 for a wet
detention pond to serve the Bertie Memorial Hospital located at
Windsor, NC.
This permit shall be effective from the date of issuance until
August 10, 2011 and shall be subject to the following specified
conditions and limitations:
I. DESIGN STANDARDS
1. This permit is effective only with respect to the nature and
volume of stormwater described in the application and other
supporting data.
2. This stormwater system has been approved for the management of
stormwater runoff as described on page 4 of this permit, the
Project Data Sheet.
3. Approved plans and specifications for this project are
incorporated.by reference and are enforceable parts of the
permit.
3

DIVISION OF WATER QUALITY
PROJECT DATA
Project Name:
Permit Number:
Location:
Applicant:
Mailing Address:
Application Date:
Water Body Receiving Stormwater
Runoff:
Classification of Water Body:
Bertie Memorial Hospital
SW7000108
Bertie County
Bertie County
Board of Commissioners
P.O. Box 530
Windsor, NC 27983
6/26/01; original
7/31/01; complete
UT - Cashie River
C
Total Site Area: 10.04 acres
Total Impervious Surfaces allowed
(including future phase 2): 6.02 acres
Pond/Basin Depth:
Required Surface Area
(SA/DA):.
Provided Surface Area:
Required Storage Volume:
Provided Storage Volume:
Controlling Orifice:
4
4.0 ft
23,179 sf
27, 113 sf
20,774 cf
26,522 cf
2.375 - inch diameter

4. No homeowner/lot owner/developer shall be allowed to fill in,
alter, or pipe any vegetative practices (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.
S. 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. Change of ownership
d. Redesign or addition to the approved amount of built --upon
area
e. Further subdivision of the project area.
ln.addition, the Director may determine that other revisions
to the project should require a modification to the permit.
6. The Director may notify the permittee when the permitted site
does not meet one or more of the minimum requirements of the
permit. Within the time frame specified in the notice, the
permittee shall submit a written time schedule to the Director
for modifying the site to meet minimum requirements. The
permittee shall provide copies of revised plans and
certification in writing to the Director that the changes have
been made.
11. 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
its entirety, vegetated and operational for its intended
use prior to the construction of any built -upon surfaces
except roads.
b. During construction, erosion shall be kept to a minimum
and any eroded areas of the system will be repaired
immediately.
2. The facilities must be properly maintained and operated at all
times. The approved Operation and Maintenance Plan must be
followed in its entirety and maintenance must occur at the
scheduled intervals.
3. The permittee shall at all times provide the operation and
maintenance necessary to assure the permitted stormwater
system functions at optimum efficiency including, but not
limited to:
5

a_ Semi-annual 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.
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. 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.
6. Upon completion of construction 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. Mail the Certification to the
Washington Regional Office, 943 Washington Square Mall,,
Washington, North Carolina, 27889, attention Division of Water
Quality.
7. A copy of the approved plans and specifications shall be
maintained on file by the Permittee for a minimum of five
years from the date of the completion of construction.
III. GENERAL CONDITIONS
1. This permit -is not transferable. In the event there is a
desire for the facilities to change ownership, or there is a
name change of the Permittee, a formal permit request must be
submitted to the Division of Water Quality accompanied by an
application fee, documentation from the parties involved, and
other supporting materials as may be appropriate. The
approval of this request will be considered on its merits and
may or may not be approved.
2. Failure to abide by the conditions and limitations contained
in this permit may subject the Permittee to enforcement action
by. the Division' of Water Quality, in accordance with North
Carolina General Statute 143-215.6(a) to 143-215.6(c).
2

3. The issuance of this permit does not preclude the Permittee
from complying with any and all statutes, rules, regulations,
or ordinances which may be imposed by other government
agencies (local, state, and federal) which have jurisdiction.
4. In the event that the facilities fail to perform
satisfactorily, including the creation of nuisance conditions,
the Permittee shall take immediate corrective action,
including those as may be required by this Division, such as
the construction of additional or replacement stormwater
management systems.
5. The permit may be modified, revoked and reissued or terminated
for cause. The filing of a request for a permit modification,
revocation and reissuance or termination does not stay any
permit condition.
Permit issued this the 10 th day of August, 2001.
NORTH CAROLINA ENVIRONMENTAL MANAGEMENT COMMISSION
/—Gregg. Thorpe, Ph.D., Acting Director
Division of dater Quality
By Authority of the Environmental Management
Permit Number SW7000108
7
Commission

Bertie County Memorial Hospital
Wet Detention Pond System
Stormwater Permit No. SW7000108
Designer'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,
for
(Project)
(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
Sate
E

vi
Bertie County Memorial Hospital
Wet Detention Pond System
Stormwater Permit No. SW7000108
Designer's Certification
11�� T�,�
I, nt " �
, as a duly
registered Professional Engineer in the State of North Carolina,
having been authorized to observe ( ericdical /weekly/full time)
the construction of the project''+�t
, &JQ �`"'�ev-rya
UOSy j � Let )P. en'_l'o, l O,A &S� ( Project ),
for 'pf'"hY p��l�r� _ (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
Regzstrati
Date

,r.; 1

Transmittal HDR Engineering, Inc. 5700 Lake Wright Drive Telephone:
Norfolk, Virginia 757 222-1500
23502 fal
Attention Division of Water Quality Date 10/25/2001 Job No. 00026-001-030
To Washington Regional Office
943 Washington Square Mall pry EC V E D
Washington, North Carolina, 27889
OCT 2 9 260
Regarding Bertie Memorial Hospital
Wet Detention Pond System - Designer's Certification �tJilY OMA Dn
I Stormwater Permit No. SW7000108
We are sending you: f l Attached IEl I � Under separate cover via the following items
❑ Shop drawings ❑ Prints �❑ f Plans u Samples ❑ I Specifications
❑ Copy of letter 0 Change Order �0: Other
Copies Date No. Description
L 1 10-24-2001 Designer's certification
These are transmitted as checked below:
" For approval LM Approved as submitted LD J Resubmit copies for approval
El I For your use ❑j Approved as noted I El I Submit copies for distribution
El As requested [J Returned for corrections LM Return corrected prints
El For review/comment L_Qj Other
❑1 Forbids due 19 u Prints returned after loan to us
Thanks
Copy to Bertie'County_Memorial Hospital Signed Paul De_Iphos _
Mr. Bill Vondenkam , HDR
if enclosures are not as noted please notify us at once

e,l.h"VNV F F4l K> Ol'.i'1L:EUSEONL i
it Il 1 Date Received J I I I II
Fee Paid
Permit Number
11[d 11 IN hg �1i1�
fLlL�
State of North Carolina
-. -- — Department of Environment and Natural Resources
Division of Water Quality
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
71311,91 This form may be photocopied for use as an original
I. GENERAL INFORMATION
1. Applicants name (specify the name of the corporation, individual, etc. who owns the project):
2. Print Owner/Signing) Official's name and tide (person legally responsible for facility and compliance):
lr
t�W'T�1[rIW v- U�4- GV.\Am- , rSF-,Z r-- La. rs"A2':� of + 113S1oNl-✓Lj
3. Mailing Address for person listed in 'stem 2 above:
Cam. M-Y- L53 t>
City:: \+•.I%V-1r.7sori I State: t-1 Zip: Z-7`7,83
Telephone Number: 2 5 2- '1 `14-• 5 3a�
4. Project Name (subdivision, facility, or establishment name - should be consistent with project name on
plans, specifications, letters, operation and maintenance agreements, etc.):
15aMTl� ME"CaR-tAL, Q,=,5 tvi T-AL-
5. Location of Project (street address):
City: S County: on r--
6. Directions to project (from nearest major intersection):
Q. � , ES WEST Fi2-om i,� rr—zrz,SEc n o4 -w- U 5 1 7
Tpy'j Fr2.b W. �b�6
��
7. Latitude: �'o 0 ` Longitude: 57 ° — 3rz> of project
8. Contact person who can answer questions about the project:
Name:.Telephone Number: (zsz) 8i�. By 89
II. PERMIT INFORMATION:
'I. Specify whether project is (check one): New Renewal Modification
Form SWU-101 Version 3.99 Page l of 4

2. It this application is being submitted as the result of a renewal or modification to an existing permit, list the t
existing permit number and its issue date (if known)
3. Specify the type of project (check one):
Low Density ✓ High Density Redevelop General Permit Other
4. Additional Project Requirements (check applicable blanks):
�CAMA Major Sedimentation/Erosion Control 404/401 ermit �NPDES Stormwater
Information on required state permits can be obtained by contactin the Customer Service Center at
1-877-623-6748. K
III. PROJECT INFORMATION
1. In the space provided ow, summarize how stormwate ill be treated. Also attach a detailed narrative
(one to two pages) descri ' g stormwater management r the project .
STt4ZM IAj ATE V 1A A A—E-�+Ar rl-r fir- 1c ,Try 2 i� rLC-i�J+� � 4,�tr� s�
��EE NA�}'nuE
2. Stormwater runoff from this
3. Total Project Area: Ib. o 4-
5. How many drainage areas does the
6. Complete the following informatioi
project, attach an additional sheet yt
to e �a"GE River basin.
4. Project Built Upon Area: 'S 19 %
have? 1 // e9l(�
:h drainage area. If there are a than two drainage areas in the
information for each area provided in the same format as below.
$aszn Inf©rnxatn w�
$ ' Ur eArea 1`k `t
Dr e Area Z
Receiving Stream Name
Receiving Stream Class
Drainage Area.
Exi tin Impervious * Area
o.o
Proposed lm ervious{Are
3 . iL !4
% Impervious* Area (to
?z A
rt= g)''?rainageArea7
erv�ous [��. � �
��,.
�: ,rtk:asra-zwa�<.a:r ..�.>,er-:-��s�i,.�a
g n
Drarri� e Area 2
•n � s%�;`w�sa+:rx
On -site Buildings
7, 73P
On -site Streets
On -site Parking
7gg¢s1 37 7
= , ! 4 3.11 base
On -site Sidew
ter -
Other, on -site .
/ , G p0
Off -site
2479, 296
Total: ¢-37, 29g
Tot s. 8 ? %o
* Impervious area is defined as the built upon area including, but not limited to, buildings, roads, parking areas,
sidewalks, gravel areas, etc.
Form SWU-101 Version 3.99 Page 2 of 4

2:., If this application is being submitted as the result of a renewal or modification to an existing permit, list the
existing permit number and its issue date (if known)
3. Specify the type of project (check one):
Low Density ✓High Density Redevelop General Permit Other
4. Additional Project Requirements (check applicable blanks):
�CAMA Major Sedimentation Control _404/401 Permit �NPDES Stormwater
Information on required state permits can be obtained by contacting the Customer Service Center at
1-877-623-6748.
III. PROJECT INFORMATION
1. In the space provided below, summarize how. stormwater will be treated. Also attach ad etailed narrative
(one to two pages) describing stormwater management for the project.
z
N� C�7E1r r`fAFs1 n�� A�►i� b�. t`a//�r� nER�+G.aE� Foe Z rN-SE
fF1ahE� i�"'�YrSLV�aw, />L2EFI ��7,7fr4SF. ; TF+A•,E,J:. C��� t+titl' +'�F2E,4 c IZ`ELCp�IS.F. � 7DflIL t'tM1�,2UlOu� /-i,^L£H = �^�, 3%D.t,F
2. Stormwater runoff frorn this project dri-IinS to the River basin.
3. Total Project Area! /a, o¢- r� � P � j acres 4- Pr f3L.ilt�U}�pn Area:
S. I -low many drainage areas does the project have? ) JUL 3 12001
6. Complete the following information for each drainage area. If there are more than two dra
project, attach an additional sheet with the infeiTnation for each area'provide �ihe;sa►�ie_"
J.Co�G- Fy
0
60= 6°7
to.
e areas in the
eat as below.
-r s� a. ,}wv
sl3tasm hifomlatlom
. 't. 6if '
-. a - w. --_. .ae3fd4 ,vx"�a g.'-SF:
�� >Dr3tnageAma 1 a�- �z
c�'%.5r .,.eK ,.. ;-.ASR;�n A ,. ,
,'aE`,
�s L�ramage Elred
a ` ° -+thA, ;`a?'
Receiving Stream Name
\fT- Cs�s�� E �,, �W
Receiving Stream Class
G
Drainage Area
/0' o 4-
Existing Impervious* Area
o.c�
Pro osed Irn ervious*Area
�- ►L ,ate (, .D 1� t
G f �cP�.r PA 2.
% Impervious* Area (total)
/Q
3�P xk * z
o� s sr#acetrea E'
�Buildings
Dr�u>agea
t�%r1i nage}lAreas'�¢.t
On -site t, _�
�/� �3g s.�.
?'G S 3 • i L G.e
On -site Streets _
On -site Parking
On -site Sidewalks ��,�.}E x)
5 S88 5.r.
Other on -site ��
/. Goo S.F. Lo�
Total: Zmz, 3-701.F.
Total: 07�
" Impervious area is defined as the built upon area including, but not limited to, 6ildings, roads, parking areas,
sidewalks, gravel areas, etc.
Form SWU-101 Version 399
Page 2 of 4

7. ' How was the off -site impervious area listed above derived? t4"' ✓-1, _�� �,� 3c
IV. DEED RESTRICTIONS AND PROTECTIVE COVENANTS
The following italicized deed restrictions and protective covenants are required to be recorded for all
subdivisions, outparceLs and future development prior to the sale of any lot. If lot sizes vary significantly, a
table listing each lot number, size and the allowable built -upon area for each lot must be provided as an
attachment.
1. The following covenants are intended to ensure ongoing compliance with state stormwater management permit
number as issued by the Division of Water Quality. These covenants may
not be changed or deleted without the consent of the State.
2. No more than u / A square feet of any lot shall be covered by structures or impervious materials.
Impervious materials include asphalt, gravel, concrete, brick, stone, slate or similar material but do not include wood
decking or the water surface of swimming pools. m_.::,AcJ. t-A&a.4A1nvF. Y,aG.-,_ t F-.rz-
sire a�c�as.
3. Swales shall not be filled in, piped, or altered except as necessary to provide driveway crossings.
4. Built -upon area in excess of the permitted amount requires a state stormwater management permit modification prior to
construction.
5. All permitted runoff from outparcels or future development shall be directed into the permitted storm water control
system. These connections to the stormwater control system shall be performed in a manner that maintains the
integrity and performance of the system as permitted.
By your signature below, you certify that the recorded deed restrictions and protective covenants for this project
shall include all the applicable items required above, that the covenants will be binding on all parties and
persons claiming under them, that they will run with the land, that the required covenants cannot be changed or
deleted without concurrence from the State, and that they will be recorded prior to the sale of any lot.
V. SUPPLEMENT FORMS
The applicable state stormwater management permit supplement form(s) listed below must be submitted for
each BMP specified for tints project_ Contact the Stormwater and General Permits Unit at [phone] for the
status and availability of these forms.
Form SWU-102
Wet Detention Basin Supplement
Form SWU-103
Infiltration Basin Supplement
Form SWU-104
Low Density Supplement
Form SWU-105
Curb Outlet System Supplement
Form SWU-106
Off -Site System Supplement
Form SWU-107
Underground Infiltration Trench Supplement
Form SWU-108
Neuse River Basin Supplement
Form SWU-109
Innovative Best Management Practice Supplement
Form SWU-101 Version 3.99 Page 3 of 4

VI. SUBMITTAL REQUIREMENTS
Only complete application packages will be accepted and reviewed by the Division of Water Quality (DWQ),
A complete package includes all of the items listed below. The complete application package should be
submitted to the appropriate DWQ Regional Office.
1. Please indicate that you have provided the following required information by initialing in the space
provided next to each item.
• Original and one copy of the Stormwater Management Permit Application Form
• One copy of the applicable Supplement Form(s) for each BMP
• Permit application processing fee of $420 (payable to NCDENR)
• Detailed narrative description of stormwater treatment/management
• Two copies of plans and specifications, including:
. , - Development/Project name
- Engineer and firm
-Legend
- North arrow
- Scale
- Revision number & date
Mean high water line
-Dimensioned property/project boundary
- Location map with named streets or NCSR numbers
- Original contours, proposed contours, spot elevations, finished floor elevations
- Details of roads, drainage features, collection systems, and stormwater control measures
- Wetlands delineated, or a note on plans that none exist
- Existing drainage (including off -site), drainage easements, pipe sizes, runoff calculations
- Drainage areas delineated
- Vegetated buffers (where required)
VII. AGENT AUTHORIZATION
If you wish to designate authority to another individual or firm so that they may provide information on your
behalf, please complete this section.
Designated agent (individual or firm): �A.� � � �� Q•-F— P90,5+oe-jr �Ca ►9,e�r�, r rvrt ram►[ .
Mailing Address: 11 o k �V_ 1 aca ST 5o mu- 41>0
City: Aue,4_Wr.1%0,21A State: -44- Zip: ZZ 7.14
Phone: 79 .S18 • 04n,9 -7 Fax: ( -7 a •3 ) S!8 Be. S[a
j�F„y7�,cEr� !�!{CG�4tiTi�GT ►3o�C7� G+►�o�.,r.�A , 2ECss•�: ']7Z�
VIII. APPLICANT'S CERTIFICATION
1, (print or type name of
certify that the informi
that the project will be
and protective
ena
NCAC 2H.1000., )
Signature:
s n listed in General Information, item ?)
rn included on this permit application form is, to the best of my knowledge, correct and
tstructed in conformance w4th the approved plans, that the required deed restrictions
will be recorded, and that the proposed project complies with the requirements of 15A
Date:
Form SWU-I01 Version 3.99 Page 4 of 4

Permit No.
(!o be provided by DWQ)
State of North Carolina
I JUL2QD1. DepaAment of Environment and Nat-u.ral Resources
Division of Water Quality
STORMWATER MANAGEMENT PERMIT.APPLICATION FORM
WET DETENTION BASIN SUPPLEMENT
This form may be photocopied for use as an original
DWO Storrnwater Management Plan Review:
A complete stormwater management plan submittal includes an application form, a wet detention basin
supplement for each basin, design calculations, and plans and specifications showing all basin and outlet
structure details.
1. PROJECT INFORMATION
Project Name: �l-'rnr- - .—
Contact Person:
CCv��jT2ULT7 ram,.) Uf�S
For projects with multiple basins, specify which basin this worksheet applies'to:
elevations
Basin Bottom Elevation -7-2. -, ft,
Permanent Pool Elevation /- ft.
Temporary Pool Elevation T.. � ft.
SZ •ems
(floor of the basin)
(elevation of the orifice)
(elevation of the discharge structure overflow)
ctretls
Pcrznanent Pool Surface Arcs 0-7, 11 a scl, ft. (water. sit rface area at the orifice elevation)
Drainage Area 10 •o¢- ac, (on -sire and off -site drainage to the basin)
lznpizvious Area ac. (on -sire anti off -site drainage to the basin)
volumes
Permanent Pool Volume '1-t¢z8 cu. ft, (combined volume of main basin and forebay)
Tcinporary Pool Volume 13 F�nz cu. ft. (volunte detained above the pennanent pool)
Forebay Volume t 32z3 cu, ft. (approxirnafely 20`30 of total volume)
Other parameters 3 /b
(surface tired to drainage area ratio from DWQ table)
SAIDAt 4 " o
Diameter of Orifice 2 -4s in. (2 to 5 day temporary pool draw -clown required
Design Rainfall / in.
design TSS Removal Z (minimurn 85%, required)'
orin SWU-102 Rev 3.99 Page 1 of 4

Permit No.
(to be provided by DWQ)
State of North Carolina
Department of Environment and Natural Resources
Division of Water Quality
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
WET DETENTION BAS SUPPLEMENT
This form maybe phototopie for use as an original f �l I JUN' 2 6 2001
DWQ Stormwater Management Plan Review:
A complete stormwater managem nt plan submittal
supplement for each basin, design calculations, an�
structure details.
I. PROJECT INFORMATION
Project Name: done✓ M5v%4az i P,
Contact Person: �C,w,� 17anJrJELL
For projects with multiple basins, speci
elevations
Basin Bottom Elevation
Permanent Pool Elevation
Temporary Pool Elevation
areas
Permanent Pool Surface
Drainage Area
Impervious Area
volumes
Permanent Pool Volume
Temporary Pool Volume
Forebay Volume
Other parameters
SA/DA 1
Diameter of Orifice
Design Rainfall
Design TSS Removal 2
Form SWU-lo2 Rev 3.99
Ll
� ,b vVEQ tiJaRD
includes an application form; a--wet=detention basin
plans and specifications showing all basin and outlet
d Phone Number: ( zsz-) 8►�. • C34a�
ULr1r�j . UW5
h basin this worksheet applies'to:
(floor of the basin)
(elevation of the orifice) �P
ft. {elevation of the discharge structure overflow}
(water surface area at the orifice elevation)
(on -site and off -site drainage to the basin)
(on -site and off -site drainage to the basin)
1,6¢0-8 cu. ft. (c mbined volume of main basin and forebay)
t 3z cu. ft. (votpu
me detained above the permanent pool)
3ZZb cu. ft. (ap.oximately 20% of total volume}
a " o (surface area to drainage area ratio from DWQ table)
2 ��g in (2 to 5 day temporary pool draw -down required)
/ in.
9d % (minimum 85% required) d ol."
O Y A' GaQ. C Y S u
Page 1 of 4 19k. x

;7
A
Footnotes:
1 When using the Division SAIDA tables, the correct SAIDA ratio for permanent pool sizing should be computed based upon the
actual impervious % and permanent pool depth. Linear interpolation should be employed to determine the correct value for non-
standard table entries.
2 in the 20 coastal counties, the requirement for a vegetative filter may be waived if the wet detention basin is designed to provide
90% TSS removal. The NCDENR BMP manual provides design tables for both 85% TSS removal and 90% TSS removal.
H. REQUIRED ITEMS CHECKLIST
The following checklist outlines design requirements per the Stormwater Best Management Practices Manual
(N.C. Department of Environment, Health and Natural Resources, February 1999) and Administrative Code
Section: 15 A NCAC 2H .1008.
Initial in the space provided to indicate the following design requirements have been met and supporting
documentation is attached. If the applicant has designated an agent in the Stormwater Management Permit
Application Form, the agent may initial below. If a requirement has not been met, attach justification.
Applicants Initials
'a. The permanent pool depth is between 3 and 6 feet (required minimum of 3 feet).
b. The forebay volume is approximately equal to 20% of the basin volume.
c. The temporary pool.controls runoff from the design storm event.
d. The temporary pool draws down in 2 to 5 days.
�4A e. If required, a 30-foot vegetative filter is provided at the outlet (include non -erosive flow
calculations)
f. The basin length to width ratio is greater than 3:1.
g. The basin side slopes above the permanent pool are no steeper than 3:1.
h. A submerged and vegetated perimeter shelf with a slope of 6:1 or less (show detail).
SOD i. Vegetative cover above the permanent.pool elevation is specified.
J. A trash rack or similar device is provided for both the overflow and orifice.
k. A recorded drainage easement is provided for each basin including access to nearest right-
of-way.
�+ 1. If the basin is used for sediment and erosion control during construction, clean out of the
basin is specified prior to use as a wet detention basin.
5t~t~ NAMC-1UC-- m. A mechanism.is specified which will drain the basin'for maintenance or an emergency.
ft'fT +ti G►ff__10
III. WET DETENTION BASIN OPERATION AND MAINTENANCE AGREEMENT
The wet detention basin system is defined as the wet detention basin, pretreatment including forebays and the.
vegetated filter if one is'provided.
This system (check one) 0 does
This system (check one) 0 does
fl de' s not incorporate a vegetated filter at the outlet.
does not incorporate pretreatment other than a forebay.
Form SWU-102 Rev 3.99 Page 2 of 4

S
Maintenance activities shall be performed as follows:
1. After every significant runoff producing rainfall event and at least monthly:
a. Inspect the wet detention basin system for sediment accumulation, erosion, trash accumulation,
vegetated cover, and general condition.
b. Check and clear the orifice of any obstructions such that drawdown of the temporary pool occurs
within 2 to 5 days as designed.
2. Repair eroded areas immediately, re -seed as necessary to maintain good vegetative cover, mow vegetative
cover to maintain a maximum height of six inches, and remove trash as needed.
3. Inspect and repair the collection system (i.e. catch basins, piping, swales, riprap, etc.) quarterly to
maintain proper functioning.
4. Remove accumulated sediment from the wet detention basin system semi-annually or when depth is
reduced to 75% of the original design depth (see diagram below). Removed sediment shall be disposed
of in an appropriate manner and shall be handled in a manner that will not adversely impact water quality
(i.e. stockpiling near a wet detention basin'or stream, etc.).
The measuring device used to determine the sediment elevation shall be such that it will give an accurate
depth reading and not readily penetrate into accumulated sediments.
When the permanent pool depth reads 3
When the permanent pool depth reads -5
Sediment RAoval El. _7g• 0 17
Bottom Ele'ation � o
FOREBAY
}
feet in the main pond, the sediment shall be removed.
feet in the forebay, the sediment shall be removed.
BASIN DIAGRAM
(fill in the blanks)
Permanent Pool Elevation 81
Sediment Removal Elevation 78 a
-------------------------------------
Bottom Elevation -77 a
MAIN POND
75%
25 %
5. Remove cattails and other indigenous wetland plants when they cover 50% of the basin surface. These
plants shall be encouraged to grow along the vegetated shelf and forebay berm.
6. If the basin must be drained for an emergency or to perform maintenance, the flushing of sediment
through the emergency drain shall be minimized to the maximum extent practical.
Form SWU-102 Rev 3.99
Page 3 of 4

7. All components of the wet detention basin system shall be maintained in good working order
I acknowledge and agree by my signature below that I am responsible for the performance of the seven
maintenance procedures listed above. I agree to notify DWQ of any problems with the system or prior to any
changes to the system or responsible party.
Print name:
Title
al
1�— a-r'L° MSL'6+2.rAL 1-taq�br7HL
Address: t5ErzrIE 1Mr=,,%i&t1AL 4gerr✓aL, , 1r1�pjrsbn_-- rule.. 2-1483
Phone'. 252 • -7 9 4 • S 1 4/
Note: The legally responsible party should not be a homeowners association unless more than 50% of the lots have been sold and
a resident of the subdivision has been named the president.
I, /ii r�D�9 .S YV'Oz , a Notary Public for the State of �%�TN &VV6,.04 ,
County of Se6wFd2T , do hereby certify that 4/ Ilel-
personally appeared before me this ZL _ day of and acknowledge the due
execution of the forgoing wet detention basin maintenance requirements. Witness my hand and official seal,
SEAL
My commission expires_ _ :QZ�z
Form SWU-102 Rev 3.99 Page 4 of 4

Bertie ]Memorial Hospital
stormwater Management fond -Final Design Narrative
July 30, 2001
1. Introduction
A stormwater Management is designed for the Bertie Memorial Hospital Site and for future
expansion for water duality control. The stormwater management (SWM) pond is designed to
meet the State North Carolina Department of Environmental and Natural RCSOCIrces criteria. "I he
site is located in Windsor, North Carolina within Bertie County. The project is classified as a
high -density development since the site includes a storm water collection system consisting of
curb and gutter and storm sewer pipes. The drainage area of the pond consists of 10.04 acres
including 3.14 acres of impervious areas that will be build in the first phase and an additional
allowable 124,601 square feet for phase 2, The SWM Pond will be able to accommodate a total
impervious area of 262,370 square feet for ultimate developed conditions. Impervious areas for
Phase I include the hospital building roof, parking lots, sidewalks, concrete pad areas and a
helicopler-landing pad. Phase 2 consists of future expansion of the site with additional
impervious area.
2. SWIM Pond design parame(ers and conlil;uralion
The design for water quality control is based on guidelines established in Siorinwater Best
Management Practices, Not -Ili Carolina Department of Environmental (Ind Nr int-al Resources,
Division of 11'ater, April 1999. For water quality control the SWM pond will inClude a
permanent pool, an aquatic herich and ,I sediment forcl)ay. No vegetated filter is provided;
therefore (lie 90% `1'SS removal design criteria were used for siring the permanent pool. Based
Oil a geotechnical invesligation performed on March 27, 2000, by CPEC Environmental Inc., the
estimated seasonal high-water table in the proposed pond location is estimated at 81.94 feet. The
Permanent pool elevation was set at elevation 81.0 feet, 0.9 feet below the seasonal high water
table in order to maintain a permanent pool. The pond bottom was set at elevation 77.0 feet, 4-
feet below the normal pool. Based on the Required SA/DA table provided by the Washington
District Office of Division of Waiter Quality, for an imperviousness of 60 % and a design depth
of' 4 feet, a SA/DA of 5.3% is required. The actual pond SA/DA ratio is 6.2%. The total
maximum depth useCI for design c(luals 4 feet, which includes one foot of sediment storage.
Temporary storage is provided for Phase 1 and Phase 2 based on a one (1) inch runoff evert. For
Phase 1, the percentage imperviousness equals 31.5%, while for Phase 2 the temporary storage is
based on 60% total site imperviousness. The side slopes of the wet pool was set at 3:1, the
sideslopcs above the wet pool was set at 4: I. A I04eet wide aquatic bench was included which
will be secCled with wetland plants. The agClatrc IJetich will also serve as a safety feature. Table
1 below presents the key hydrological and pond characteristics.
I=:1F'�'nonnlll't�alunei�113ritie Sw19 f'ontlllinal desi n Ite s 7-3Q-Ill.di c 1

Table 1
Table 1. Summary of Drainage Basin and SWM Pond Characteristics
Drainage Area
437,298 square feet
Ultimate Impervious Area
262,370 square feet
Impervious SWM Drainage Area
60 %
Surface Area
27,113 square feet
Pool Volume
66,428 cubic feet
Forebay Volume
13,220 cubic feet
3. Final drairnage configuration and results of analysis
The stormwater management pond services two subareas. The first sub -area consists of the
hospital building, the main parking lot, the helicopter pad, other miscellaneous impervious areas,
grassed and landscaped areas, Inc].an undeveloped portion, A storm sewer system collects the
runoff from the roof drains, parking lot and other Impervloll5 areas and drains it into the pond at
Structure Number H-1. The inflow pipe consists of it 30-inch pipe and drains into a forebay
number 1. A baffle consistim, of an earthen berm withiil the poll(] was included to increase the
flow length of the discharge from the Sturm sewer through the main wet pool io at least 3: 1
average length to average width ratio.
The second subarea consists of it p.lrking lot located immediately to the cast of' the hospital
building and the grassed area south of the hospital bnrldint, imd main parking lot. RUIlo1f from
the second sub -area di-,dris into a vegelaled sw de and into 1 the casters lorebay number- 2 of the
stormwater management poll(].
The outfall structure consists of- a 36-Inch corrugated metal riser pipe with a trash rack. A
drawdown time of 2 clays was used to size the water quality opening. For Phase I, a 2.3/8-111ch
diameter- opening is required with an actual drawdown time of 2.2 days. The invert elevation of
the 2 3/8 - inch opening is set at elevation 81.00, and controls the permanent pool elevation. The
trash rack protects the water quality opening. The crest of the riser pipe is designed for phase 2
and is required to be at elevation S1.72 feet to store the volume of 21,503 cubic feet produced by
a one -inch runoff event. The cl-cst of the riser pipe is set it elevation 82.00 feet. F'or phase 2 the
orifice opening can be increased to a 2 3/4 — inch diameter opening to maintain an approximate 2-
clay draw down period. If the orifice opening is kept at 2 3/8 inch the draw clown period is
approximately 2.8 days. The pond has an emergency spillway at elevation 83.0 discharging into
an existing ditch. The top of the SWM Pond embankment is at elevation 85.0 providing 3 feet of
freeboard above the crest of the principal spillway and 2 feet above the emergency spillway.
Storm routing of the 10-year and 100-year design storm was used using the modified rational
equation to develop an inflow hydrograph and routing it through the pond using calculated stage -
storage and stage -discharge relationship. Software developed by Intellisolve Inc., Hydriflow-
Hydrographs was used for storage rousing. Basal on the routing calculations for Phase 2 during
I=:1I'crscmaill'Dahmenlltertic Sw\9 I'mdll anal design Report 7-30-01.dcx 2

a critical storm duration of 30-minutes, the peak pond elevations for the 10-year and the 100-year
events equaled 82.91 ft and 83.3 feet respectively. The peak outflow equaled 14.6 cfs and 24.3
cfs for the 10-year and the 100-year events respectively. For the 100-year event in Phase 2
conditions, 2.7 Beet of freeboard is available between the top of the dam and the peak pond water
surface elevation.
F:%Per5una1\111 b1iirnciABcrIic SWNi Pond\Final design Report 7-30-0I.do 3

Job Na
No.
HDR Computation
Project ��/��2 e+!A(I Hosp3t ICompti[ed (Dale �-tau j
Subject I U�+((Checked Date
Task �! n IJ�St� n L5heet 1 _ lof 3
1,0 pzlat, PUuK sc.sr �u0
To41, U(c, �(pI't ucl.,5 N37, 2y P 5-1-)
GJ�c I T4-rv/✓IOv5 A = 137,761 flp i(3,/6 GL.
ToO T, v(vA fP- T-or Uc(y5
v
'xkJ =
Iep 4 -- 1.f, C) f t
�)er � L s., i y%, 55 �e�0V �fo POP(
5-�l/1,1/4 = 5.3
U
Suifou �;�N `f35�U�L, _w 2� Icy kL
P/ovf-At Sc,( 1,LcA(z, P� (�3LI/ �1,0 Z�, II 3 1Z o�
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Job No. Ta
HDR Computation f aq
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Subject j _ _ Checked Date
Task 12 5 1 �Yv- ISheet Z I01
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or
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PO Pc, �� "� ,���,� rev �2,v1.
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U� �tv
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(J
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Q G vb = 0 • � i
-I� js`{.
AIL",
of
JO
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fit
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2a (41.24Re
j4
36

Job Na
Na
HDR Computation
Protect ��� I� U, i d i-i f)5 p,-i -" lCompwed
Subject 1 Checked Date
(Task+ (Sheet 101
,y
NOAY
R� U+oj 0'0 `l
qv-
u e U�1yu.r-l1
r,r c Z jam....-P u.i�,-7
if I,.�u • e=
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�2vv ,.� vtr44Me
- ��,Su3
E�' �j -71 �1
Z/rP
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Safe

Option 3a Stage -Storage
Bertie Memorial Hospital
SWM Pond
Windsor, North Carolina
DETENTION VOLUME CALCULATION -July 24, 2001
POND ELEVATION - STORAGE RELATIONSHIP
Forebay 1
Forebay 2
Total
ELEV Stage
AREA
I Delta Y
Volume
ELEVATION Stage
AREA
Delta Y
Volume
Volume
feet
feet
sq feet
feet
cubic feet
feet
feet
sq feet
feet
cubic feet
cubic feet
77.00
0.00
1417.00
0.00
0
77.00
0.00
1293_.
0.00
0
0
78.00
1.00
1890.00
1.00
1648
78.00
1,00
1800
1.00
1540
3187
79.00
2.00
2635.00
1.00
3900
79.00
2.OQ
2375
1.00
3620
7520
80.00
3.00
3422.00
1.00
692D
80.00
3.00
2996
1.00
6300
13220
Main Pool below
Elev. 80
Total SWM Pond
Total
ELEV Stage
AREA
Delta Y
Volume
ELEVATION Stage
AREA
Delta Y
Volume
Volume
feet
feet
sq feet
feet
cubic feel
feet
feet
sq feet
feet
cubic feet
cubic feet
77.00
0.00
7545
0.00
0
77.00
0
78.00
1.00
9099
1.00
8310
78.00
11497
79.00
2.00
10694
1.00
18196
79.00
25716
80.00
3.00
12348
1.00
29707
80.00
18766
42927
80'.00
3 00
20tJ66
OQO
Q
42927
81�00`����
&1� 4
�27,r113 �
� 30'Q0�3
�'.`i.0 : �
�:66428 =
82.00
5.00
31434
1.00
29247
95675
83.00
6.00
36479
1.00
63172
158847
84.00
7.00
42459
1.00
102603
261450
Phase 1
Phase 2
Avg. Depth
2.45
Avg. Depth
2.45
Surface Area
0.62
Surface Area
0.62
Drainage Area
10.04 1
Drainage Area
10.04
SA/DA
6.2%
SA/DA
6.2%
Req'd SA/DA
4.0%
Req'd SA/DA
5.4%
Forbay/Main Poolvolu
20%
Forbay/Main Poolvolume
20%
Req'd WOV
12154
Req'd WOV
21503
Dry Volume @ Elev 8
29247
Dry Volume @ Elev 82
29247
WQV = at elevatioi
81.42
WOV = at elevatioi
81.74
Detention Time (hour:
48.00
Detention Time (hours)
48
Avg. Release Rate (ci
0.07
Avg. Release Rate (cfs)
0.12
Avg Head (ft)
0.21
Avg Head (ft)
0.37
Req'd Orifice Area
0.032
Req'd Orifice Area
0.043
Req'd Diameter (ft)
0.20
Req'd Diameter (ft)
0.23
Req'd Diameter (inch(
2.42
Req'd Diameter (inches)
2.80
Actual Diameter (inch,
2.38
Actual Diameter (inches)
2.75
Actual Area
0.031
Actual Area
0.041
Avg Release rate
0.07
Avg Release rate
0.12
Detention Time (hour:
5D.0
Detention Time (hours)
49.6
[:1137-106Mrainaye\6enie SWM Pond Finni Design 712512001

LJWUYWHKU
5lA r f `C_. A/z y
85% TSS REMOVAL
30 FOOT VEGETATED FILTER REQLTMD-' '
CDFlSTfl(-- 'T JkIJ Atfo f
DEPTH
3`
3.5'
4,0'
4.5'
5.0'
5.5'
6.0'
6.5'
7.0'
7.5'
IMP c90
101yo
_9
.8
.7
.6
.5
0-
0
0
0
0
20%p
1.7
1.3
1.2
1.1
1.0
.9
.8
.7
.6
.5
30%
2.5
2.2
1.9
1.8
1.6
1-5
1.3
12
1.0
.9 '
4Q%
3.4
3.4
2.6 1
2.4
2.1
1.9
1.6
1.4
1.1
1.0
50%
4.2
3.7
3.3
3.0
2.7
2.4
2.1
1.8
15
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
5.2
4.5
4.1
3.7
*3.3
2.9
2.5
2.1
1.8
80%
U
6,0
5,2
4-7
4.2
3.7
3.2
2.7
2.2
2.0
90%
7.5
6.5
5.8
-3 .
4,8
4.3
3.8
3.3
2.8
1.3
100%
9 2
7.4
6,8f6.2
5.6
5.0
4.4
3.8
3.2
2.6
V EC IVttiSa�-
*Revi.scd 10131i97 I • U f' , a l� (r _.
90% TSS REMOVAL
_ NO VEGETATED FI�TER REQUIRED
DEPTH
3'
3.5'
4.0'
4.5'
5.0'
5.5'
6.0'
6.5'
7.0'
7.5'
IMP %
10%
1.3
1.0
.8
.7
.6 .
5
.4
.3
.2
.1
20%
2.4
2.0
1.8
1.7
1.5
1.4
1.2
1 1.0
.9
.6
30%
3.5
3.0
2.7
2.5
2.2
1.9
1.6
1.3
1.1
.8
40%
4.5
4.0
3.5
3.1
2.8
2.5
2.1
1.8
1.4
1.1
50%a
5.6
5.0
4.3
3.9
3.5
3.1
2.7
13
1.9
1-5
60%.
7.0
6.0
5.3
.4.8_
4.3 .
-3.9.
3.4
2.9
2.4,
1.9
70%
9.1
7.0
6.0
15.5
5.0
4.5
3.9
3.4
2-9
2.3
80% 19.4
8.0
7.0
6-4
5.7.
5.2
4.6
4.0
3.4
2.8
90%
10.7
9.0
7.9
7.2
6.5.
5.9
5.2
4.6
3.9
3.3
1O-0
12.0
10.0 1
8.8
8.I
7.3
6.6
5.8
'3.1
4.3
3.6
1

Dahmer, Pieter
From: Kailmer, Bill
Sent: Wednesday, ,January 17, 2001 5:08 PM
To: Dahmen, Pieter
Subject: Berne
I
Square footage:
VA 4 �C
Building
Sidewalks
51,738 i-r
5,588
Parking Lots and Roads 78,843 + �'
Hefipad
1,600
Green Space
299,529
Total Site
437,298
Watershed for underground storm drain system: 172,498
)9G1UC X
C TvIFr�iGv3j�u�

Hydrograph Plot
Hyd, No. 1
u L
SWM Basin Inflow
Hydrograph type
= Rational
Storm frequency
= 10 yrs
Drainage area
= 10.0 ac
Intensity
= 8.60 in
I-D-F Curve
= Bertie County.IDF
A
English
Peak discharge = 62.17 cfs
T'me i ery I
Runoff coeff. = 0.72
Time of conc. (Tc) = 5 min
Reced. limb factor = 2.8
Total Volume = 35,438 cull
1 - Rational - 10 Yr - Qp = 62.17 cfs
80
6
Cn
40- / Hyd. 1
c�
20-
/i
0 5 10 15 20
Time (min)
0-
—
0
D. f
D. f

Hydrograph Summary Report
Page 1
Hyd.
No.
Hydrograph
type
(origin)
Peak
flow
(cfs)
Time
interval
(min)
Time to
peak
(min)
Volume
(Cult)
Return
period
(yrs)
Inflow
hyd(s)
Maximum
elevation
(ft)
Maximum
storage
(cuft)
Hydrograph
description
1
Rational
62.17
1
5
35,438
10
----
------
------
SWM Basin Inflow
2
Reservoir
1.05
1
18
13,g32
10
1
82.12
33,277
Outflow 5wm Basin
i
i
i
Proj. file: Bertie Memorial Hospit l 6[D%f3l-opl3efitmCGMW.IDF
Run date: 07-25-2001

Hydrograph Summary Report
Page i
Hyd.
No.
Hydrograph
type
(origin)
Peak
flow
(cfs)
Time
interval
(min)
Time to
peak
(min)
Volume
(cult)
Return
period
(yrs)
Inflow
hyd(s)
Maximum
elevation
(ft)
Maximum
storage
(cuft)
Hydrograph
description
1
Rational
81.77
1
5
46,608
100
------
---—
SWM Basin Inflow
2
Reservoir
5:29
1
17
24,092
100
1
82.39
42,422
Outflow Swm Basin
f UU
yPui
V
r
!! 0
G7� ' `�'1
q�
i
Proj. file: Bertie Memorial Hospital
60D%flh9p13I fC&JRWADF
Run date: 07-25-2001

Hydrograph Summary Report
Page 1
Hyd.
No.
Hydrograph
type
(origin)
Peak
flow
(cfs)
Time
interval
(min)
Time to
peak
(min)
Volume
(cuff)
Return
period
(yrs)
Inflow
hyd(s)
Maximum
elevation
(ft)
Maximum
storage
(cutt)
Hydrograph
description
1
Rational
30.89
1
30
105,647
10
----
------
------
SWM Basin Inflow
2
Reservoir
14.58
1
74
83,916
10
1
82.91
60.237
Outflow Swm Basin
PA
f
�u -
I�Ieq/
�r�T t
�tot
�U�w¢���
Proj, file: Bertie Memorial Hospit
18[ID�offkepBf�fif�elCFtft�W.1DF
Run date: 07-25-2001

Hydrograph Summary (deport
Page 1
Hyd.
No.
Hydrograph
type
(origin)
Peak
flow
(cfs)
Time
interval
(min)
Time to
peak
(min)
Volume
(cuff)
Return
period
(yrs)
inflow
hyd(s)
Maximum
elevation
(ft)
Maximum
storage
(cuft)
Hydrograph
description
1
Rational
43.18
1
30
147,665
100
----
------
------
SWivi Basin Inflow
2
Reservoir
24.30
1
66
125,475
100
1
83.30
74,860
Outflow Swm Basin
DP
I
I
Proj. file: Bertie Memorial Hospit
1 6UDF.DepBea fief "ADF Run date: 07-25-2001

H dro ra h Plot C/-,,�/- � SOU/�,
Y 9 p
Hyd. No. 1
SWM Basin Inflow
Hydrograph type
= Rational
Storm frequency
= 100 yrs
Drainage area
= 10.0 ac
Intensity
= 5.97 in
I-D-F Curve
= Bertie County.IDF
English
'j 0
Peak discharge =: 33.58 cfs
Time interval =
1 min
Runoff coeff. =
0.56
Time of conc. (Tc) =
30 min
Reced. limb factor =
2.8
Y Total Volume = 114,851 tuft
1 - Rational - 100 Yr - QP 33..58 cfs
40
i
- I 0 - + Hyd. 1
I
10 f
I
0.
0 50 100 150
Time (min)

Hydrograph Plot
Hyd. No. 1
SWM Basin Inflow
Hydrograph type
Storm frequency
Drainage area
Intensity
I-D-F Curve
= Rational
= 100 yrs
= 10.0 ac
= 10.39 in
= Bertie County.IDF
0AV- /
English
Peak discharge = 58.44 cfs
Time interval = 1 min
Runoff coeff. = 0.56
Time of cone. (Tc) = 5 min
Reced. limb factor = 2.8
Total Volume = 33,311 cult
1 - Rational - 100 Yr - Op - 58.44 cfs
60
i I
1
40- —
N
y
20- —
' I
I
10-L-
1
0,
0 5 10 15 20
Time (min)

Hydrograph Summa Report �� i �D-~i/
Summary
Page 1
Hyd.
No.
Hydrograph
type
(origin)
Peak
flow
(cfs)
Time
interval
(min)
Time to
peak
(min)
Volume
(cuft)
Return
period
(yrs)
Inflow
hyd(s)
Maximum
elevation
(ft)
Maximum
storage
(cuff)
Hydrograph
description
1
Rational
48.36
1
5
27,563
10
----
------
------
SWM Basin inflow
2
Reservoir
0.13
1
18
9,997
10
1
81,89
26,020
Outflow Swm Basin
i
i
Proj. file: Bertie Memorial Hospit
I.ODWfile: Bertie County.IDF
Run date- 07-25-2001

Hydrograph Summary Report D Yk
Page 1
Hyd.
No.
Hydrograph
type
(origin)
Peale
flow
(cfs)
Time
interval
(min)
Time to
peak
(min)
Volume
(tuft)
Return
period
(yrs)
Inflow
hyd(s)
Maximum
elevation
(ft)
Maximum
storage
(tuft)
Hydrograph
description
1
Rational
24.03
1
30
82,170
10
----
------
------
SWM Basin Inflow
2
Reservoir
11.35
1
74
60,712
10
1
82.65
51,401
Outflow Swm Basin
.b LA
I
Proj. file: Bertie Memorial Hospit
I.(3[)VVfile: Bertie County.IDF
Run date: 07-25-2001

Hydrograph Summary Report
Page 1
Hyd.
No.
Hydrograph
type
(origin)
Peak
flow
(cfs)
Time
interval
(min)
Time to
peak
(min)
Volume
(cult)
Return
period
(yrs)
Inflow
hyd(s)
Maximum
elevation
(ft)
Maximum
storage
(cuft)
Hydrograph
description
1
Rational
33.58
1
30
114,851
100
---
------
------
SWM Basin Inflow
2
Reservoir
15.72
1
74
93,006
100
1
83.03
64,539
Outflow Swrn Basin
'100
I
C! JJ
J 7Lv�h
_
V A,7
Pro}. tile: Bertie Memorial Hospit I.GB'VVtile: Bertie County.IDF
Run date: 07-24-2001

Hydrograph Summary Report
Page 1
Hyd.
No.
Hydrograph
type
(origin)
Peak
flow
(cfs)
Time
interval
(min)
Time to
peak
(min)
Volume
(cult)
Return
period
(yrs)
Inflow
hyd(s)
Maximum
elevation
(ft)
Maximum
storage
(cuft)
Hydrograph
description
1
Rational
63.60
f
5
36,251
100
----
------
------
SWM Basin Inflow
2
Reservoir
1.30
1
18
14,634
100
1
82.14
33,980
Outflow Swm Basin
l ou
i
i
i
Proj. file: Bertie Memorial Hospit
1.QBVVfile: Bertie County.lDF Run date: 07-24-2001

Hydrograph Plot CfI �+�.� 5i0,� PU�,4 //,v ✓\
Hyd. No. 1
SWM Basin Inflow
Hyd rograp h type
Storm frequency
Drainage area
Intensity
-D-F Curve
= Rational
= 10 yrs
= 10.0 ac
= 4.27 in
= Bertie County.IDF
English
Peak discharge = 24.03 cfs
Time interval =
1 min
Runoff coeff. =
0.56
Time of conc. (Tc) =
30 min
Reced. limb factor =
2.8
Total Volume = 82,170 cuft
1 - Rational - 10 Yr - Qp - 24.03 cfs
25
2
I
cn 1
T Hyd. 1
0
1
0 50 100 150
Time (min)
- i
i

Hydrograph Plot
Hyd. No. 1
SWM Basin Inflow
Hydrograph type
Storm frequency
Drainage area
Intensity
I-D-F Curve
= Rational
= 10 yrs
= 10.0 ac
= 7.28 in
= Bertie County.IDF
English
Peak discharge = 40.92 cfs
Time interval = 1 min
Runoff coeff. = 0.56
Time of conc. (Tc) = 5 min
Reced. limb factor = 2.8
Total Volume = 23,322 cult
1 - Rational - 10 Yr - Op = 40.92 cfs
50
I i
40- - - �-
i i
I
I
• Hyd. 1
0 i I
i
i
10-- i
I
;
0
0 5 10 15 20
Time (min)

Transmittal
HDR Architecture, Inc.
I) JUL 31 2001 ,
Attention Mr. William Moore
1101 King Street
Telephone:
Suite 400
Alexandria, VA
Re40,. 703-518-8500
Fax-703-518-8686
Elk
22314-2980
114i
71,71
IMA�
1 Date 7-30-01 1 Job No. 00026-001-030
To North Carolina Dept. of Environment and Natural Resources — Div. Of Water Ou
943 Washington Square Mall
1 Washington, NC 27889 Phone: [phone]
Bertie Memorial Hospital — SWM Aoolication Modifications
We are sending you:
Shop drawings
�J Copy of letter
X I Attached
Prints
�J Change Order
" Under separate cover via
�x Plans " Samples
�x Other See Below
the following items
Specifications
Copies Date No. Description
1 7-26-01 1 Calcs, Narrative, WDBS (pg 1), SMPA (pg. 2)
1 7-26-01 1 Plan Sheet C-4 (Modified Outlet Structure Detail) T
These are transmitted as checked below:
" For approval
L_j For your use
As requested
�J For review/comment
Forbids due
Remarks
L__j Approved as submitted
Approved as noted
Returned for corrections
U Other
L.j Resubmit copies for approval
L� Submit copies for distribution
Return corrected prints
20 01 L--J
1 Mr. Moore,
1 Included are the modifications that you requested as per our phone conversation about the original submittal. (Only
1 those application sheets that were affected by the number changes have been resent). If you have any questions about the
modifications, please do not hesitate to call me.
Copy to FILE, Alan Tenpenny - PCMH 1 Signed Bill Vondenkamp
If enclosures are not as noted please notify us at once

JUL 2001