SW8040215_HISTORICAL FILE_20030303 (3)

STORMWATER DIVISION CODING SHEET
POST -CONSTRUCTION PERMITS
PERMIT NO.
SW8 D4 02 15
DOC TYPE
❑ CURRENT PERMIT
❑ APPROVED PLANS
HISTORICAL FILE
❑ COMPLIANCE EVALUATION INSPECTION
DOC DATE
2003 03 03
YYYYMMDD

State Stormwater Management Systems
Permit No. SW8 040215
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT AND NATURAL
DIVISION OF WATER QUALITY
STATE STORMWATER MANAGEMENT PERMIT
HIGH DENSITY DEVELOPMENT
In accordance with the provisions of Article 21 of Chapter 143, General Statutes of North
Carolina as amended, and other applicable Laws, Rules, and Regulations
PERMISSION IS HEREBY GRANTED TO
Hunter & Bundy
Eastern Aluminum Storage Facility
Onslow County
FOR THE
construction, operation and maintenance of a wet detention pond in compliance with the
provisions of 15A NCAC 2H .1000 (hereafter referred to as the "stormwater rules') and the
approved stormwater management plans and specifications and other supporting data as attached
and on file with and approved by the Division of Water Quality and considered a part of this
permit.
This permit shall be effective from the date of issuance until March 3, 2014, and shall be subject
to the following specified conditions and limitations:
I. DESIGN STANDARDS
This permit is effective only with respect to the nature and volume of stormwater
described in the application and other supporting data.
2. This stormwater system has been approved for the management of stormwater runoff as
described on page 3 of this permit, the Project Data Sheet. The stormwater control has
been designed to handle the runoff from 52,228 square feet of impervious area. This pond
must be operated with a vegetated filter.
3. The tract will be limited to the amount of built -upon area indicated on page 3 of this
permit, and per approved plans. The built -upon area for the future development is limited
to 7,500 square feet.
4. All stormwater collection and treatment systems must be located in either dedicated
common areas or recorded easements. The final plats for the project will be recorded
showing all such required easements, in accordance with the approved plans.
5. The runoff from all built -upon area within the permitted drainage area of this project must
be directed into the permitted stormwater control system. A permit modification must be
submitted and approved prior to the construction of additional built -upon area from
outside of the approved drainage area.

State Stormwater Management Systems
Permit No. SW8 040215
DIVISION OF WATER QUALITY
PROJECT DESIGN DATA SHEET
Project Name:
Permit Number:
Location:
Applicant:
Mailing Address:
Application Date:
Receiving Stream/River Basin:
Stream Index Number:
Classification of Water Body:
Drainage Area, acres:
Onsite, sq. ft.:
Offsite, sq. ft.:
Total Impervious Surfaces, sq. ft.:
Pond Depth, feet:
TSS removal efficiency:
Permanent Pool Elevation, FMSL:
Permitted Surface Area, sq. ft.:
Permitted Storage Volume, cubic ft.:
Temporary Storage Elevation, FMSL:
Controlling Orifice:
Permitted Forebay Volume, cubic ft.:
Eastern Aluminum Storage Facility
SW8 040215
Onslow County
Mr. Jay Bundy, General Partner
Hunter & Bundy
P.O. Box 11540
Goldsboro, NC 27532
March 3, 2004
Northeast Creek / White Oak
19-16-(0.5)
"SC NSW"
1.70
74,052
none, per engineer
52,228
5.0
85% (a 30' vegetated filter is required)
39.0
2,98 1 @Permanent Pool
5,283
40.51
1" � (drawdown in 2-5 days)
1,202
3

State Stormwater Management Systems
Permit No. SW8 040215
Il. SCHEDULE OF COMPLIANCE
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 surface.
During construction, erosion shall be kept to a minimum and any eroded areas of the
system will be repaired immediately.
The permittee shall at all times provide the operation and maintenance necessary to assure
the permitted stormwater system functions at optimum efficiency. The approved
Operation and Maintenance Plan must be followed in its entirety and maintenance must
occur at the scheduled intervals including, but not limited to:
a. Semiannual scheduled inspections (every 6 months).
b. Sediment removal.
C. Mowing and revegetation of slopes and the vegetated filter.
d. Immediate repair of eroded areas.
C. Maintenance of all slopes in accordance with approved plans and specifications.
f. Debris removal and unclogging of outlet structure, orifice device, flow spreader,
catch basins and piping.
g. Access to the outlet structure must be available at all times.
4. Records of maintenance activities must be kept and made available upon request to
authorized personnel of DWQ. The records will indicate the date, activity, name of
person performing the work and what actions were taken.
Decorative spray fountains will be allowed in the stormwater treatment system, subject to
the following criteria:
a. The fountain draws its water from less than 2' below the permanent pool surface.
b. Separated units, where the nozzle, pump and intake are connected by tubing, may
be used only if they draw water from the surface in the deepest part of the pond.
C. The falling water from the fountain must be centered in the pond, away from the
shoreline.
d. The maximum horsepower for the fountain's pump is based on the permanent
pool volume. The maximum pump power for a fountain in this pond is 1 /8
horsepower.
6. The facilities shall be constructed as shown on the approved plans. 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.
Upon completion of construction, prior to issuance of a Certificate of Occupancy, and
prior to operation of this permitted facility, a certification must be received from an
appropriate designer for the system installed certifying that the permitted facility has been
installed in accordance with this permit, the approved plans and specifications, and other
supporting documentation. Any deviations from the approved plans and specifications
must be noted on the Certification. A modification may be required for those deviations.
8. If the stormwater system was used as an Erosion Control device, it must be restored to
design condition prior to operation as a stormwater treatment device, and prior to
occupancy of the facility.
9. The penmittee shall submit to the Director and shall have received approval for revised
plans, specifications, and calculations prior to construction, for any modification to the
approved plans, including, but not limited to, those listed below:
4

State Stormwater Management Systems
Permit No. SW8 040215
a. Any revision to any item shown on the approved plans, including the stormwater
management measures, built -upon area, details, etc.
b. Project name change.
C. Transfer of ownership.
d. Redesign or addition to the approved amount of built -upon area or to the drainage
area.
C. Further subdivision, acquisition, or sale of all or part of the project area. The
project area is defined as all property owned by the permittee, for which
Sedimentation and Erosion Control Plan approval or a CAMA Major permit was
sought.
f. Filling in, altering, or piping of any vegetative conveyance shown on the approved
plan.
10. The permittee shall submit final site layout and grading plans for any permitted future
areas shown on the approved plans, prior to construction. If the proposed BUA exceeds
the amount permitted under this permit, a modification to the permit must be submitted
and approved prior to construction.
11. A copy of the approved plans and specifications shall be maintained on file by the
Permittee for a minimum of ten years from the date of the completion of construction.
12. At least 30 days prior to the sale or lease of any portion of the property, the permittee
shall notify DWQ and provide the name, mailing address and phone number of the
purchaser or leasee. An access/maintenance easement to the stormwater facilities shall be
granted in favor of the permittee if access to the stormwater facilities will be restricted by
the sale or lease of any portion of the property.
13. The permittee must maintain compliance with the proposed built -upon area and ensure
that the runoff from all the built -upon is directed into the permitted system.
14. 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 penmittee 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.
15. The permittee must maintain the current permitted drainage area. No additional runoff
from outside of the permitted drainage area boundary may enter the permitted stormwater
facilities without first applying for and receiving a permit modification.
111. GENERAL CONDITIONS
This permit is not transferable except after notice to and approval by the Director. In the
event of a change of ownership, or a name change, the permittee must submit a formal
permit transfer request to the Division of Water Quality, accompanied by a completed
name/ownership change form, 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. The permittee is responsible
for compliance with all permit conditions until such time as the Division approves the
transfer request.
2. Failure to abide by the conditions and limitations contained in this permit may subject the
Permittee to enforcement action by the Division of Water Quality, in accordance with
[North Carolina General Statute 143-215.6A to 143-215.6C.
3. The issuance of this permit does not preclude the Permittee from complying with any and
all statutes, rules, regulations, or ordinances which may be imposed by other government
agencies (local, state, and federal) which have jurisdiction.

State Stormwater Management Systems
Permit No. SW8 040215
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 permittee grants DENR Staff permission to enter the property during normal business
hours for the purpose of inspecting all components of the permitted stonmwater
management facility.
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.
7. Unless specified elsewhere, permanent seeding requirements for the stormwater control
must follow the guidelines established in the North Carolina Erosion and Sediment
Control Planning and Design Manual.
Approved plans and specifications for this project are incorporated by reference and are
enforceable parts of the permit.
9. The permittee shall notify the Division any name, ownership or mailing address changes
within 30 days.
Permit issued this the 3rd day of March 2004.
NORTH CAROLINA ENVIRONMENTAL MANAGEMENT COMMISSION
Alan W. Klimek, P.., Director
Division of Water Quality
By Authority of the Environmental Management Commission

State Stormwater Management Systems
Permit No. SW8 040215
Eastern Aluminum Storage Facility
Stormwater Permit No. SW8 040215
Onslow County
Designer's Certification
as a duly registered
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.
The checklist of items on page 2 of this form is included in the Certification.
Noted deviations from approved plans and specification:
SEAL
Signature
Registration Number
Date

State Stormwater Management Systems
Permit No. SW8 040215
Certification Requirements:
1. The drainage area to the system contains approximately the permitted acreage.
2. The drainage area to the system contains no more than the permitted amount of
built -upon area.
3. All the built -upon area associated with the project is graded such that the runoff
drains to the system.
4. The outlet/bypass structure elevations are per the approved plan.
5. The outlet structure is located per the approved plans.
6. Trash rack is provided on the outlet/bypass structure.
7. All slopes are grassed with permanent vegetation.
8. Vegetated slopes are no steeper than 3:1.
9. The inlets are located per the approved plans and do not cause short-circuiting of
the system.
10. The permitted amounts of surface area and/or volume have been provided.
H. Required drawdown devices are correctly sized per the approved plans.
12. All required design depths are provided.
13. All required parts of the system are provided, such as a vegetated shelf, and a
forebay.
14. The overall dimensions of the system, as shown on the approved plans, are
provided.
cc: NCDENR-DWQ Regional Office
Onslow County Building Inspections

Consulting Engineers and Land Surveyors
March 2, 2004
Ms. Laurie Munn
Dept. of Environment and Natural Resources
Water Quality Section RECEIVED
127 Cardinal Drive, Ext
Wilmington, NC 28405-3845
MAR 0 3 2004
Q�
Subject: Express Stormwater Management
Eastern Aluminum Storage Facility
Onslow County
Proj. # 040133
Dear Ms. Munn:
Enclosed for your review and approval, please find the following items:
Two (2) copies of the revised plans.
Two (2) copies of the revised sheet 2 of the application with all
impervious areas broken into square footage.
Two (2) copies of the calculations with the engineer's seal.
[phone] Office
[phone] Office
[phone] Fax
If you have any questions or require additional information, please do not hesitate
to call this office at [phone].
cc: file
Sincerely,
Sean C. Robey, P.E.
Kimberly D. Hamby
Engineering Assistant
150-A US Highway 158 East, Camden, NC 27921

I
w ATF9
f,
•
Mr. Jay Bundy
Hunter & Bundy
P.O. Box 11540
Goldsboro, NC 27532
Dear Mr. Bundy:
Michael F. Easley, Governor
William G. Ross Jr., Secretary
North Carolina Department of Environment and Natural Resources
Alan W. Klimek, P.E.,Director
Division of Water Quality
Coleen H. Sullins, Deputy Director
Division of Water Quality
February 23, 2004
Subject: REQUEST FOR ADDITIONAL INFORMATION
Stormwater Project No. SW8 040215
Eastern Aluminum Storage Facility
Onslow County
The Wilmington Regional Office received a Stormwater Management Permit Application for
Eastern Aluminum Storage Facility on February 23, 2004. A preliminary review of that information has
determined that the application is not complete. The following information is needed to continue the
stormwater review:
1. Please either delineate all wetlands on site, disturbed or undisturbed, or note on the plans
that none exist.
✓ 2. Please add the nearest intersection of two major roads to the vicinity map. A major road
is any 1, 2 or 3 digit NC, US or interstate highway.
,/ 3. Please specify the pond vegetation and the wetland species to be planted on the 6:1 shelf.
✓4. Please provide a 3:1 L: W flow path ratio in the pond.
✓5. Please dimension the permanent pool contour.
/ 6. Please delineate the drainage area to the pond. The application lists 2 drainage basins for
this project. The drainage delineation map should show both of these basins.
✓ 7. Please provide a 30' vegetative filter at the outlet of the pond. Also, please add a
vegetative filter detail for the plans. I have included a copy of the detail.
✓ 8. Please seal the calculations.
✓ 9. Please report all built -upon areas in square feet on the application. Please separate the
future proposed area from the square footage shown on the plans. The future area will be
covered by this permit. Upon development of the future area, a revised plan must be
submitted.
N. C. Division of Water Quality
Wilmington Regional Office
127 Cardinal Drive Extension
Wilmington, NC 28405
[phone]
[phone] Fax
Customer Service
1 800 623-7748
;,�d_,«—A
N DENR

Mr. Jay Bundy
Page 2
February 23, 2004
V/10. Please dimension the building.
11. Please provide a note on the plans that all roof drainage will be directed so as to be
picked up by the pond.
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 March 1, 2004.
If you need additional time to submit the information, please mail or fax your request for a time
extension to the Division at the address and fax number at the bottom of this letter. The request must
indicate the date by which you expect to submit the required information. The Division is allowed 90
days from the receipt of a completed application to issue the permit.
The construction of any impervious surfaces, other than a construction entrance under an
approved Sedimentation Erosion Control Plan, is a violation of NCGS 143-215.1 and is subject to
enforcement action pursuant to NCGS 143-215.6A.
Please reference the State assigned project number on all correspondence. Any original
documents that need to be revised have been sent to the engineer or agent. All original documents must be
returned or new originals must be provided. Copies are not acceptable. If you have any questions
concerning this matter please feel free to call me at [phone].
Sincerely,
Laurie Munn
Environmental Engineer
RSS/:Ism S:\WQS\STORMWAT\ADDINFO\2004\040215.feb04.doc
cc: Laurie Munn
Kimberly D. Hamby

R 1,p Rap
Energy 30'
Dissipator ., `
A
Ounlet
piping
+
Plow
Spreader
Mechanism
* 50' for SA Class Waters
i Width as required to provide
non -erosive flow
VEGETATED FILTER. DETAIL
Receiving
I
Stream 1
PLAN
SECTION A -A

1
FILE MODE _
459 MEMORY TX
* * * COMMUNICATION RESULT REPORT ( FEB.23.2004 2:41PM ) *
TTI
OPTION ADDRESS (GROUP) RESULT
----------------------�K —
-------------------------82523385552
REASON FOR ERROR
E-3) NONANSWERUP R LINE FAIL
P. 1
NCDENR WIRO
PAGE
----P--- P.4/4
E-2) BUSY
E-4) NO FACSIMILE CONNECTION
State of North Carolina
Department of Environment and Natural Resources
Wilmington Regional Office '
Michael F. Easley, Govemor William O. Ross 7r., Secretary
FAX COVER SHEET
Date: A3I oq No. Of Pages: `I
To: rXM From: I.&dLI-i A i &Ln n
CO; CO: foul 0,
FAX#: I 5a 3,3 $ 5A FAX#: 9jW50-2004
REMARK'
127 Cardillo] 0rha E.xlenebn, WIWI"% N.C. 294OW045 Telephone (910) 398,1900 Ees MO) 3504004
An Eclool Opporrunhy Aftmadva Aetbn ampanyor

Hyman & Robey_,, PC
Conruliing Engineers and Land Surveyors [phone] Office
[phone] Office
[phone] Fax
February 20, 2004
Ms. Laurie Munn
Dept. of Environment and Natural Resources
Water Quality Section
127 Cardinal Drive, Ext
Wilmington, NC 28405-3845
Subject: Express Stormwater Management Permit
Eastern Aluminum Storage Facility
Onslow County
Proj. # 040133
Dear Ms. Munn:
Enclosed for your review and approval, please find the following items:
1. Two (2) copies of the above referenced plans.
2. The original and one (1) copy of the Stormwater Exemption Application
and Wet Detention Basin Supplement.
3. Two (2) copies of the project description and calculations.
4. Check in the amount of $4,000.00 for the required fee.
If you have any questions, please do not hesitate to call this office at
[phone].
cc: file
Sincerely,
Sean C. Robey, P.E. a
Kimberly D. Hai y
Engineering Assistant
150-A US Highway 158 East, Camden, NC 27921

PROJECT. DESCRIPTION
Eastern Aluminum Storage Facility
Onslow County - North Carolina
Hunter & Bundy is proposing to construct an Eastern Aluminum Storage Facility
north of Jacksonville in Onlsow County. The site is approximately 3.37 acres with
frontage on Halltown Road (SR 1410) and US Highway 17. Construction on the site will
include an entrance drive, one building with required parking, and a wet detention basin.
An existing septic system on the site will be used.
The site consists of two drainage areas. Drainage Area 1 contains 1.75 acres along
the Halltown Road frontage. This drainage area will contain all of the impervious
surfaces on the site. This includes 22,500 sf of building, 7,500 sf of future building
addition, 20,032 sf of asphalt pavement, and 1,996 sf of concrete. The concrete areas
include the loading dock and ramp, sidewalk, and dumpster pad. This creates a total
impervious area of 52,028 sf (1.20 acres) or 68.57% of the drainage area. Stonnwater
from the east side of the building will be collected in a grass lined swale with 3:1 side
slopes that will drain to an underground collection system which also collects the runoff
from the parking lot. The drainage from the west side of the building (roof) will be
collected in a piped drainage system. All of the water collected from the impervious
areas will drain to a wet detention basin designed for 85% TSS removal. The pond was
sized based on 70% impervious using the 85% TTS removal SA/DA chart. Inflow to the
pond was determined utilizing TR-55. The actual storage provided slightly exceeds the
I" runoff. (The 1" storage in our pond assumes straight sides from permanent pool;
therefore, additional storage is provided due to the 3:1 side slopes.) The pond discharges
into a 215 if grass lined swale. Peak discharge during a 10 year storm will be 1.49 cfs
and during a 25 year storm it will be 3.01 cfs.
Soils on site are a Craven fine loam. This soil is in a "C" hydrology group which
indicates permeability rates that would be too slow for infiltration. Based on this soil
type and the water table, we feel that a wet detention basin will be the most appropriate
method of stormwater treatment for this site.
Drainage Area 2 contains the remaining 1.62 acres of land that will remain
undeveloped. All of this land drains by sheet flow across the grassed land to existing
perimeter ditches.
The disturbed area required for site development is approximately 2.37 acres. The
application for Erosion and Sedimentation Control is being files for 3.5 acres to allow the
owner to perform some fine grading outside the area needf
Id E1EJ
FEB 2 3 2004
DWR
PROS #

TR-55 GRAPHICAL DISCHARGE METHOD VERSION 1.11
Project EASTERN ALUMINUM STORAGE User: KDH Date: 02-19-04
County ONSLOW State: NC Checked: Date:
Subtitle: DRAINAGE TO DETENTION POND
Data: Drainage Area 1.75 * Acres
Runoff Curve Number 90 *
Time of Concentration: 0.20 * Hours
Rainfall Type II
Pond and Swamp Area NONE
I Storm Number 1 1 2 1 3 1 9 1 5 1 6 1 7 1
I----------------------I------I------I------I------I------I------I------1
Frequency (yrs) 1 2 5 1 10 1 25 1 50 1 100 1
I I I I I I I i I
I 29 -Hr Rainfall ( in) 1 3.5 1 9 1 5. 5 1 6.3 1 7.1 1 8. 3 1 9. 1 1
I I I I I I I I
I Ia/P Ratio 0.06 0.06 1 0.04 1 0.04 1 0.03 1 0.03 1 0.02 1
I I I I I I I I I
Used 0.10 0.10 0.10 0.10 0.10 0.10 1 0.10 1
I I I I I I I I I
Runoff (in) 2.45 2. 92 4.36 I 5.14 5.92 1 7.10 1 7.89 1
I I I I I I I I I
I Unit Peak Discharge 11.250 11.250 11.250 11.250 11.250 11.250 11.250 1
(cfs/acre/in) I I
I I I I I I I I I
Pond and Swamp Factorl 1.00 1 1.00 1 1.00 1 1.00 1 1.00 1 1.00 1 1.00 1
0.0% Ponds Used I I I I I I I I
----------------------I------I------I------I------I------I------I------I
Peak Discharge (cfs) 5 1 6 1 10 I 11 13 1 16 1 17 1
* - Value(s) provided from TR-55 system routines
G.��-09
FE3 � '
Dwa
PR�� �

TR-55 CURVE NUMBER COMPUTATION VERSION 1.11
Project EASTERN ALUMINUM STORAGE User: KDH Date: 02-19-04
County ONSLOW State: NC Checked: Date:
Subtitle: DRAINAGE TO DETENTION POND
Subarea : 1.75
------------------------------------------------------------------------------
Hydrologic Soil Group
COVER DESCRIPTION A B C D
Acres (CN)
------------------------------------------------------------------------------
FULLY DEVELOPED URBAN AREAS (Veg Estab.)
Open space (Lawns,parks etc.)
Good condition; grass cover > 75% - - 0.55(74) -
Impervious Areas
Paved parking lots, roofs, driveways - - 1.20(98) -
Total Area (by Hydrologic Soil Group)
1. 75
-------------------------------------------------------------------------------
SUBAREA: 1.75 TOTAL DRAINAGE AREA: 1.75 Acres WEIGHTED CURVE NUMBER:90*
-------------------------------------------------------------------------------
* - Generated for use by GRAPHIC method

re
TR-55 Tc and
Tt THRU
SUBAREA
COMPUTATION
VERSION
1.11
Project
EASTERN
ALUMINUM STORAGE
User: KDH
Date: 02-19-04
County
ONSLOW
State:
NC
Checked:
Date:
Subtitle:
DRAINAGE
TO DETENTION
POND
-----------------------------------------------------------------------------
Flow Type
2 year
Length
Slope
Surface
n Area Wp
Velocity
Time
rain
(ft)
(ft/ft)
code
(sq/ft) (ft)
(ft/sec)
(hr)
-------------------------------------------------------------------------------
Sheet
9
36
.0096
F
0.126
Shallow Concent'd
190
.005
U
0.046
Shallow Concent'd
235
.0138
P
0.027
Time of Concentration
= 0.20*
--- Sheet Flow Surface Codes ---
A Smooth Surface F Grass, Dense
B Fallow (No Res.) G Grass, Burmuda
C Cultivated < 20 8 Res. H Woods, Light
D Cultivated > 20 % Res. I Woods, Dense
E Grass -Range, Short
* - Generated for use by GRAPHIC method
--- Shallow Concentrated
--- Surface Codes
P Paved
U Unpaved

TR-55 CURVE NUMBER COMPUTATION
VERSION 1.11
Project EASTERN ALUMINUM STORAGE User: KDH Date: 02-19-04
County ONSLOW. State: NC Checked: Date:
Subtitle: DRAINAGE TO DETENTION POND
Subarea : 1.75
-------------------------------------------------------------------------
Hydrologic Soil Group
COVER DESCRIPTION A B C D
Acres (CN)
----------------------------------------------------- ----------------
FULLY DEVELOPED URBAN AREAS (Veg Estab.)
Open space (Lawns, parks etc.)
Good condition; grass cover > 75% - - 0.55(74).
Impervious Areas _
1.20(98)
Paved parking lots, roofs, driveways - -
Total Area (by Hydrologic Soil Group) 1.75
---'---------
SUBAREA: 1.75 TOTAL DRAINAGE AREA: 1.75 Acres--- - WEIGHTED CURVE NUMBER:90
----------------------------------------- ------
* - Generated for use by GRAPHIC method
TR-55 Tc and Tt THRU SUBAREA COMPUTATION VERSION 1.11
Project EASTERN ALUMINUM STORAGE User: KDH Date: 02-19-04
County ONSLOW State: NC Checked: Date:
Subtitle: DRAINAGE TO DETENTION POND .
-- ---------------
Flow Type 2 year
rain
-- ---------------
Sheet 4
Shallow Concent'd
Shallow Concent'd
----------------------------
Length Slope Surface n
(ft) (ft/ft) code
---------------------------
36 .0096 F
190 .005 U
235 .0138 P
--- Sheet Flow Surface
Codes ---
A Smooth Surface
F
Grass,
Dense
B Fallow (No Res.)
G
Grass,
Burmuda
C Cultivated < 20 % Res.
H
Woods,
Light
D Cultivated > 20 % Res.
I
Woods,
Dense
E Grass -Range, Short
-------------------------------
Area Wp Velocity Time
(sq/ft) (ft) (ft/sec) (hr)
-------------------------------
0. 126
0. 046
0. 027
Time of Concentration = 0.20*
--- Shallow Concceenn
--- SurfaceCar,
P Pav
U Un 4
��� 18550
• •'•..VOINEEP' •.�

* - Generated for use by GRAPHIC method
TR-55 GRAPHICAL DISCHARGE METHOD VERSION 1.11
Project EASTERN ALUMINUM STORAGE User: KDH Date: 02-19-04
County ONSLOW State: NC Checked: Date:
Subtitle: DRAINAGE TO DETENTION POND
Data: Drainage Area 1.75 * Acres
Runoff Curve Number 90
Time of Concentration: 0.20 * Hours
Rainfall Type II
Pond and Swamp Area NONE .
Storm Number I 1 1 2 1 3 1 4 1 5 1 6 7 1
----------------------I------I------I ------I------I------I------I------I
I Frequency (yrs) 1 1 2 1 5 1 10 1 25 1 50 1 100 1
I I I I I I I I I
I 24 -Hr Rainfall ( in) 1 3. 5 1 4 1 5. 5 1 6. 3 1 7.1 1 8. 3 1 9.1 1
I I I i I I I I I
1 Ia/P Ratio 0.06 1 0.06 1 0.04 1 0.04 1 0.03 1 0.03 1 0.02 1
I I I I I i I I I
Used 1 0.10 1 0.10 1 0.10 1 0.10 1 0.10 1 0.10 1 0.10 1
I I I I I I I I I
I Runoff (in) 1 2.45 1 2. 92 1 4.36 1 5.14 1 5. 92 1 7.10 1 7.89 I
I I I I I I I I I
1 Unit Peak Discharge 11.250 11.250 11.250 11.250 11.250 1 1. 250 11.250 1
(cfs/acre/in). I
I I I I I I I I I
I Pond and Swamp Factorl 1.00 1 1.00 1 1.00 1 1.00 1 1.00 1 1.00 1 1.00 I
0.0% Ponds Used I I I I I I I
I----------------------I------I------I------I------I------I------I------I
I Peak Discharge (cfs) 5 1 6 1 10 1 11 1 13 1 16 1 17 1
* - Value(s) provided from TR-55 system routines

"PERMANENT POOL DETENTION PONDS
Hyman & Robey, PC
DESIGN OF POND
150-A Hwy 158 East
Camden, NC 27921
Eastern Aluminum Warehouse
(252)-335-1888
10 Yr, 24 Hr Storm
02/21/04
DETENTION POND
Page l
SA/DA PERCENTAGES FOR 90% TSS REMOVAL WITHOUT
VEGETATIVE FILTER
% IMPRV 3.0 FT 3.5 FT 4.0 FT
4.5 FT
5.0 FT
5.5 FT
6.0 FT 6.5 FT
7.0 FT
10% 1.3 1.0
0.8
0.7
0.6
0.5
0.4 0.3
0.2
20% 2.4 2.0
1.8
1.7
1.5
1.4
1.2 1.0
0.9
30% 3.5 3.0
2.7
2.5
2.2
1.9
1.6 1.3
1.1
40% 4.5 4.0
3.5
3.1
2.8
2.5
2.1 1.8
` 1.4
50% 5.6 5.0
4.3
3.9
3.5
3.1
2.7 2.3
1.9
60% 7.0 6.0
5.3
4.8
4.3
3.9
3.4 2.9
2.4
70% 8.1 7.0
6.0
5.5
5.0
4.5
3.9 3.4
2.9
80% 9.4 8.0
7.0
6.4
5.7
5.2
4.6 4.0
3.4
90% 10.7 9.0
7.9
7.2
6.5
5.9
5.2 4.6
19
100% 12.0 10.0
8.8
8.1
7.3
6.6
5.8 5.1
4.3
WATERSHED AREA:
1.7
ACRES
WATERSHED % IMPERVIOUS:
70
%
PERMANENT POOL ELEVATION:
39
FT
DESIGN PERMANENT POOL DEPTH:
5
FT
SA/DAPERCENTAGE FACTOR:
3.7
%
TAKEN ROM
85% TSS REMOVAL CHART
(NOT FROM W% CHART SHOWN ABOVE)
POND SURFACE AREA REQ'D:
FOREBAY AREA:
AT WIDTH = 0.33 LENGTH,
WIDTH = 30.221 LF
LENGTH = 90.663 LF
Use these dimensions: WIDTH
LENGTH
VOLUME OF 1" RAINFALL
2740 SF
822 SF
(BASED UPON MINIMUM SURFACE AREA)
34.26 LF
87 LF
AREA OF ROOFS:
0.69
AC
AREA OF PARKING/CONCRETE:
0.46
AC
AREA OF GREEN AREAS:
0.55
AC
VOLUME OF RUNOFF
4490.31
CF
STORAGE DEPTH FOR MINIMUM AREA =
ELEVATION OF 1" RAINFALL = 40.51
Normal Pool Elevation 39
VOL (CF)=[(ROOP 1.0)+(PARKING'.95)+(GRASS-0.2)1.43.560/12
1.51 FT
18550
d', �VII�EG�
i...NC. no ..

DRAWDOWN - WATER QUALITY
Q(2 DAYS) = 0.02599 CFS
Q(5 DAYS) = 0.01039 CFS
l" RUNOFF STAGE 1.51 FT
DEPTH OF DRAWDOWN DEVICE BELOW OUTLET 1.5 FT
1" RUNOFF OUTLET DEVICE: 0.89335 INCH DIA HOLE
DIAMETER OF HOLE TO USE: 1 INCH DIAMETER
1" STORM RUNOFF DRAWDOWN TIME 2.28019 DAYS
INFLOW HYDROGRAPH
Return Year Storm 10 Yr
Qp = Peak Discharge = I cfs
Tc = Time of Concentration =
A = [Q/(Cd* SQRT(2gh))] * 144
Rad. = SQRT(A/PI)
Dia. =2*Rad.
12 min
Calculation of Tp (Time to Peak)
From SCS NEH 4 , page 15-7 Eqn. 15.4
Lag Time (L) = (1" 0.8*(S+1)"0.7)/(1900*Y"0.5) for L in Hrs
where: I = hydraulic length of watershed (ft)
S = (1000/CN)-10
CN = approximately same CN from TR-55
Y = avg. watershed land slope in %
S = (1000/CN)-10 = 1.11111
L= 0.12127 hrs
From SCS NEH 4 , page 16-7 Eqn. 16.7
Tp=D/2+L
where : D = unit of excess duration rainfall (hrs)
L = Lag Time (hrs)
From SCS NEH 4 , page 16-8 Eqn. 16.12
D = 0.133 tc
where: Tc = Time of Concentration (hrs) - (See Tr-55 Printout)
THEREFORE: D = 0,0266 hrs
Tp =
0.13457 hrs =
8.07417
min
Volume under Hydrograph
= 1.39 * Qp * Tp =
7407.25
Cubic Feet
461
1.11111
90
0.98
SEAL
18550
HtC I tppe�i\\\\\�.

Inflow Hydrograph
SCS Dimensionless Hydrograph
Time Discharge Time
Discharge
Volume
Ratio Ratio hr
cfs
cf
0.00 0.00 0.00
0
0.10 0.03 0.01
0
16
0.20 0.10 0.03
1
53
0.30 0.19 0.04
2
101
0.40 0.31 0.05
3
165
0.50 0.47 0.07
5
250
0.60 0.66 0.08
7
352
0.70 0.82 0.09
9
437
0.80 0.93 0.11
10
496
0.90 0.99 0.12
11
528
1.00 1.00 0.13
11
533
1.10 0.99 0.15
it
528
1.20 0.93 0.16
10
496
1.30 0.86 0.17
9
458
1.40 0.78 0.19
9
416
1.50 0.68 0.20
7
362
1.60 0.56 0.22
6
298
1.70 0.46 0.23
5
245
1.80 0.39 0.24
4
208
1.90 0.33 0.26
4
176
2.00 0.28 0.27
3
149
2.20 0.21 0.30
2
221
2.40 0.15 0.32
2
157
2.60 0.11 0.35
1
114
2.80 0.08 0.38
1
82
3.00 0.06 0.40
1
59
3.20 0.04 0.43
0
43
3.40 0.03 0.46
0
31
3.60 0.02 0.48
0
22
3.80 0.02 0.51
0
16
4.00 0.01 0.54
0
12
4.50 0.01 0.61
0
13
5.00 0.00 0.67
0
0
Volume under hydrograph =
7036 cf
Based upon runoff volume = 7407.25
cf
Depth req'd for minimum area = 2.48514
18550
'�::::�-�
FAN C. ko..'O

STAGE STORAGE FUNCTION OF POND
(FOR RECTANGULER DETENTION POND ONLY)
Minimum surface area taken at normal water level
BASIN AREA INCR ACCUM
VOLUME VOLUME STAGE In s
S Z
sf cf cf ft
Pond Side Slope (M) =
In Z Z est Elevation
2981 0
0
0
Surface area at normal pool
39
3353 1584
1584
0.5
7.37
-0.69
0.51
39.5
3744 1774
3358
1
8.12
0.00
0.98
40
4153 1974
5332
1.5
8.58
0.41
1.46
40.5
4580 2183
7515
2
8.92
0.69
1.97
41
5025 2401
9916
2.5
9.20
0.92
2.50
41.5
5487 2628
12544
3
9.44
1.10
3.07
42
5968 2864
15408
3.5
9.64
1.25
3.66
42.5
6467 3109
18517
4
9.83
1.39
4.30
43
6984 3363
21880
4.5
9.99
1.50
4.97
43.5
7518 3626
25505
5
10.15
1.61
5.68
44
Regression
Output:
Constant
9.34346
Ks = S/Z'b
= 3450.398
Sul Err of Y Est
0.00969
R Squared
0.99962
No. of Observations
7
Degrees of Freedom
5
X Coefficient(s) 1.15215 = b
Std Err of Coef. 0.01009
FOR VERTICAL SIDED DETENTION POND SET b=0, AND Ks = SURFACE AREA (SF)
STAGE DISCHARGE
(FOR RISER/BARRELL SPILLWAY
W EMERGENCY WEIR)
RISER
Dr =
18
Riser Dia. (in)
Etop =
40.51
Elev. Top Riser (ft)
Cwr =
3.33
Riser weir coeff
Cdr =
0.60
Riser orifice coeff
Hln =
5
Number of Holes
Hid =
3
Hole Dia. (in)
EHI =
60.00
Elev. Holes (1)
H2n =
5
Number of Holes
H2d =
2
Hole Dia. (in)
EH2 =
60.00
Elev. Holes (2)
H3n =
0
Number of Holes
H3d =
2
Hole Dia. (in)
EH3 =
60.00
Elev. Holes (3)
BARREL:
Db =
12
Barrel Dia. (in)
Einv =
39.00
Elev Invert Barrel (ft)
Cdb =
0.60
Barrel orifice coeff
41.49
Page 4
3
SEAL
18550
'• "'4yIIVG�
,.FAN C. 10�
Bartell Adjustment Factor

EMERGENCY WEIR
Page 5
Cw
=
3
Weir coeff
Ecr
=
60.00
Elev weir coeff (ft)
Lw
=
20
Weir Length (ft)
Riser
Riser
Riser
Elevation
Hole
Hole
Hole
Riser Riser
Barrel
Principal
Emergcy
(1)
(2)
(3)
(weir) (orifice)
Spillway
Weir
39.00
0.0
0.0
0.0
0.0
0.0
0.0
0.00
0.0
39.00
0.0
0.0
0.0
0.0
0.0
0.0
0.00
0.0
39.01
0.0
0.0
0.0
0.0
0.0
0.0
0.00
0.0
39.03
0.0
0.0
0.0
0.0
0.0
0.0
0.00
0.0
39.07
0.0
0.0
0.0
0.0
0.0
0.1
0.00
0.0
39.13
0.0
0.0
0.0
0.0
0.0
0.1
0.00
0.0
39.21
0.0
0.0
0.0
0.0
0.0
0.3
0.00
0.0
39.32
0.0
0.0
0.0
0.0
0.0
0.5
0.00
0.0
39.45
0.0
0.0
0.0
0.0
0.0
0.8
0.00
0.0
39.59
0.0
0.0
0.0
0.0
0.0
1.2
0.00
0.0
39.73
0.0
0.0
0.0
0.0
0.0
1.7
0.00
0.0
39.87
0.0
0.0
0.0
0.0
0.0
2.2
0.00
0.0
40.00
0.0
0.0
0.0
0.0
0.0
2.7
0.00
0.0
40.13
0.0
0.0
0.0
0.0
0.0
3.0
0.00
0.0
40.24
0.0
0.0
0.0
0.0
0.0
3.2
0.00
0.0
40.34
0.0
0.0
0.0
0.0
0.0
3.5
0.00
0.0
40.43
0.0
0.0
0.0
0.0
0.0
3.6
0.00
0.0
40.50
0.0
0.0
0.0
0.0
0.0
3.8
0.00
0.0
40.55
0.0
0.0
0.0
0.1
1.8
3.9
0.14
0.0
40.60
0.0
0.0
0.0
0.4
2.6
4.0
0.43
0.0
40.64
0.0
0.0
0.0
0.7
3.0
4.0
0.71
0.0
40.69
0.0
0.0
0.0
1.2
3.6
4.1
1.21
0.0
40.71
0.0
0.0
0.0
1.5
3.9
4.2
1.45
0.0
40.72
0.0
0.0
0.0
1.5
3.9
4.2
1.49
0.0
40.71
0.0
0.0
0.0
1.4
3.8
4.2
1.42
0.0
40.70
0.0
0.0
0.0
1.3
3.7
4.1
1.28
0.0
40.68
0.0
0.0
0.0
1.1
3.5
4.1
1.13
0.0
40.67
0.0
0.0
0.0
1.0
3.4
4.1
0.98
0.0
40.65
0.0
0.0
0.0
0.8
3.2
4.1
0.85
0.0
40.64
0.0
0.0
0.0
0.7
3.1
4.0
0.73
0.0
C R0,
40.63
0.0
0.0
0.0
0.6
2.9
4.0
0.62
0.0
Fessio
QP H
A
40.60
0.0
0.0
0.0
0.4
2.5
4.0
0.41
0.0
! ati e
%� SEAL
40.58
0.0
0.0
0.0
0.3
2.2
3.9
0.28
0.0 a
ssso
sF�N C. •ROg�i

0
Page 6
ROUTING OF INFLOW HYDROGRAPH THROUGH POND AND OUTFLOW DEVICE
Total
Riser
Riser
Riser
Barrel
Emerg
Time
Inflow
Storage
Stage
Outflow
Holes
(weir)
(orifice)
Spillway
t (hr)
cfs
cf
Elevation
cfs
(1+2+3)
cfs
cfs
cfs
cfs
cfs
0.000
0
0
39.00
0.00
0.00
0.00
6.00
0.00
0.00
0.013
0
0
39.00
0.00
0.00
0.00
0.00
0.00
0.00
0.027
1
15.9869
39.01
0.00
0.00
0.00
0.00
0.00
0.00
0.040
2
69.2764
39.03
0.00
0.00
0.00
0.00
0.02
0.00
0.054
3
170.527
39.07
0.00
0.00
0.00
0.00
0.05
0.00
0.067
5
335.724
39.13
0.00
0.00
0.00
0.00
0.13
0.00
0.081
7
586.185
39.21
0.00
0.00
0.00
0.00
0.27
0.00
0.094
9
937.896
39.32
0.00
0.00
0.00
0.00
0.49
0.00
0.108
10
1374.87
39.45
0.00
0.00
0.00
0.00
0.81
0.00
0.121
11
1870.46
39.59
0.00
0.00
0.00
0.00
1.21
0.00
0.135
11
2398.03
39.73
0.00
0.00
0.00
0.00
1.67
0.00
0.148
11
2930.93
39.87
0.00
0.00
0.00
0.00
2.17
0.00
0.161
10
3458.49
40.00
0.00
0.00
0.00
0.00
2.68
0.00
0.175
9
3954.08
40.13
0.00
0.00
0.00
0.00
2.99
0.00
0.188
9
4412.37
40.24
0.00
0.00
0.00
0.00
3.24
0.00
0.202
7
4828.03
40.34
0.00
0.00
0.00
0.00
3.46
0.00
0.215
6
5190.4
40.43
0.00
0.00
0.00
0.00
3.63
0.00
0.229
5
5488.82
40.50
0.00
0.00
0.00
0.00
3.77
0.00
0.242
4
5733.96
40.55
0.14
0.00
0.14
1.79
3.88
0.00
0.256
4
5934.76
40.60
0.43
0.00
0.43
2.57
3.96
0.00
0.269
3
6089.7
40.64
0.71
0.00
0.71
3.04
4.03
0.00
0.296
2
6319.01
40.69
1.21
0.00
1.21
3.62
4.12
0.00
0.323
2
6422.8
40.71
1.45
0.00
1.45
3.85
4.16
0.00
0.350
1
6438.53
40.72
1.49
0.00
1.49
3.88
4.17
0.00
0.377
1
6407.85
40.71
1.42
0.00
1.42
3.82
4.16
0.00
0.404
1
6352.54
40.70
1.28
0.00
1.28
3.69
4.13
0.00
0.431
0
6286.7
40.68
1.13
0.00
1.13
3.54
4.11
0.00
0.458
0
6219.7
40.67
0.98
0.00
0.98
3.38
4.08
0.00
0.484
0
6155.43
40.65
0.85
0.00
0.85
3.21
4.05
0.00
0.511
0
6095.86
40.64
0.73
0.00
0.73
3.05
4.03
0.00
0.538
0
6041.56
40.63
0.62
0.00
0.62
2.90
4.01
0.00
0.606
0
5920.46
40.60
0.41
0.00
0.41
2.52
3.96
0.00
0.673
0
5834.9
40.58
0.28
0.00
0.28
2.21
3.92
0.00
40.7185 = maximum stage elevation
1.49363 = maximum discharge
//
Aq0�y 1'/
y,-" SEAL
J 18550 _
-04* INRog��.
�4j��mmllutt�o��•

Eastern Aluminum
Onslow County
10 yr STORM
12 m
10
r
s d
m--- INFLOW (cfs) .
g u +� y �...-OUTFLOW (cfs)
2 p^r�d 7au�y '� fir• i� i ✓""R! x •r:pU�
w
0.000 0.200 0.400 0.600 0.800
Time (hrs)
'o SEAL 2
= I8550 c
VG me,
,,//'////J�411 CII11kpe0\\\\\\\\