SW6061101_HISTORICAL FILE_20070205

STORMWATER DIVISION CODING SHEET
POST -CONSTRUCTION PERMITS
PERMIT NO.
SW
DOC TYPE
❑ CURRENT PERMIT
❑ APPROVED PLANS
T HISTORICAL FILE
❑ COMPLIANCE EVALUATION INSPECTION
DOC DATE
�%7��0�'�
YYYYMMDD

NC®ENR
North Carolina Department of Environment and Natural Resources
Division of Land Resources
James D. Simons, PG, PE Land Quality Section Michael F. Easley, Governor
Director and State Geologist William G. Ross Jr., Secretary
February 5, 2007
LETTER OF APPROVAL
Directorate o f Public Works
Attn: Gregory G. Bean
Bldg. 3-1634 Butner Road
Fort Bragg, NC 28310-5000
RE: Project Name: M3-00001-6P, Construct Vehicle Maintenance Facility Acres
Approved: 2.11
Project ID: Bragg-2007-006
County: Fort Bragg Camp MacKall Special Forces Way
River Basin: Lumber Stream Classification:" W
Submitted By: Directorate of Public Works
Date Received by LQS: 9/14/2006
Plan Type: Express
Dear Gregory G. Bean:
This office has reviewed the subject erosion and sedimentation control plan. We find the
plan to be acceptable and hereby issue this Letter of Approval. The enclosed Certificate of
Approval must be posted at thejob site. This plan approval shall expire three (3) years following
the date of approval, if no land -disturbing activity has been undertaken, as is required by Title
15A NCAC 4B .0129.
Title 15A NCAC 413.0118(a) requires that a copy of the approved erosion control plan be
on file at the job site. Also, this letter gives the notice required by G.S. 113A-61.1(a) of our right
of periodic inspection to insure compliance with the approved plan.
North Carolina's Sedimentation Pollution Control Act is performance -oriented, requiring
protection of existing natural resources and adjoining properties. If, following the
commencement of this project, the erosion and sedimentation control plan is inadequate to meet
the requirements of the Sedimentation Pollution Control Act of 1973 (North Carolina General
Statute 113A-51 through 66), this office may require revisions to the plan and implementation of
the revisions to insure compliance with the Act.
Fayetteville Regional Office
225 Green Street — Suite 714, Fayetteville, North Carolina 28301 • Phone: [phone] / FAX: [phone]

Letter of Approval
Directorate of Public Works
February 5, 2007
Page 2 of 2
Acceptance and approval of this plan is conditioned upon your compliance with Federal
and State water quality laws: regulations, and rules. In addition, local city or county ordinances
or rules may also apply to this land -disturbing activity. This approval does not supersede any
other permit or approval.
Please be aware that your project will be covered by the enclosed NPDES General
Stormwater Permit NCGO1000 (Construction Activities). You should first become familiar with
all of the requirements for compliance with the enclosed general permit.
Please note that this approval is based in part on the accuracy of the information provided
in the Financial Responsibility Form, which you provided. You are requested to file an amended
form if there is any change in the information included on the form. In addition, it would be
helpful if you notify this office of the proposed starting date for this project. Please notify us if
you plan to have a preconstruction conference.
Your cooperation is appreciated.
Sincerely,
Jodi Pace, EI
Land Quality Section
Enclosures: Certificate of Approval
NPDES Permit
cc: Directorate of Public Works
Directorate of ENV & P W, Building Inspector
Belinda Henson, Division of Water Quality i
Land Quality Section -Regional Office File

A Tt 9
QG
r
1
r�
February 7, 2007
Directorate of Public Works
Attn: Gregory G. Bean
Bldg. 3-1634 Butner Road
Fort Bragg, NC 28310-5000
Michael F. Easley, Governor
William G. Ross Jr., Secretary
North Carolina Department of Environment and Natural Resources
SUBJECT: NPDES General Stormwater Permit No. NCG010000
Project ID: Bragg-2007-006
M3-00001-6P, Construct Vehicle Maintenance Facility
Fort Bragg County
Dear Mr. Gregory G. Bean:
Alan W. Klimek, P.E., Director
Division of Water Quality
Recently you were sent a letter from the Division of Land Resources (DLR) regarding approval
of your Sedimentation and Erosion Control Plan for the subject development project. Accompanying the
DLR letter was a National Pollutant Discharge Elimination System (NPDES) General Stormwater
Permit No. NCG010000. That permit authorizes you to discharge stormwater to the surface waters of
North Carolina. Those point source discharges are associated with activities such as clearing, grading,
and other land disturbing and construction activities.
The purpose of this letter is to draw your attention to and to stress the importance of that NPDES
General Stormwater Permit. The requirements contained in the stormwater permit coupled with the
requirements called for by the Division of Land Resources are vitally important to the protection of the
waters of the State. If you have not already done so, you are urged to immediately read and adhere to
the stormwater permit requirements contained there in. Of particular importance are Parts I and 11 of the
permit.
Parts I and 11 set forth the minimum visual monitoring and reporting requirements for your
stormwater discharge. In particular, Part I, Section B describes the visual monitoring frequencies and
locations, the requirement to maintain a rain gauge onsite, and the need to maintain a written record of
all inspections. Upon commencement of your land disturbing activity, you must initiate the visual
monitoring and record keeping requirements as called for in the permit. The visual monitoring data
results, along with all other permit required records must be maintained on -site and made available to
Division of Water Quality representatives upon request and/or during upcoming inspections. The
remaining parts of the Permit set forth definitions, general conditions and special conditions applicable
to stormwater discharge(s). The conditions include special reporting requirements in the event of
noncompliance, bypasses, treatment unit/process failures, etc.
or hCarolina aWurn(/jl
North Carolina Division of Water Quality 225 Green Street — Suite 714 Fayetteville, NC 28301-5043 Phone [phone] Customer Service
Internet: h2o.enr.state.nc.us FAX [phone]
An Equal Opportunity/Affirmative Action Employer— 50% Recycled110% Post Consumer Paper

Gregory G. Bean
Page 2
February 7, 2007
This letter is also meant to advise you that should you fail to comply with the terms and
conditions of the permit you could be subject to enforcement as called for in Section 143-215.6 of the
North Carolina General Statutes. A civil penalty (fine) of up to $25,000 per violation per day may be
assessed for such violations. We ask that if you find at any time that you are unable to comply with the
terms and conditions of the Permit, that you contact this Office immediately.
As mentioned previously, the purpose of this letter is to advise you of the importance of the
NPDES General Stormwater Permit and by this notification prevent unnecessary impacts to the waters
of the State. Again, if you have not already.done so, please read the permit and contact Mr. Michael
Lawyer or Mr. Chad Turlington of this Office at [phone] if you have any questions or need
clarification.
Sincerely,
Belinda Henson
Regional Supervisor
Surface Water Protection Section
BH/ia
Fort Bragg County Stormwater Files
DWQ Central Files

\G� W AT�9Q Michael F. Easley, Governor
Q\ (� William G. Ross Jr., Secretary
C7 r North Carolina Department of F,nvironmenl and Notural Resources .
1
.O `- Alan W'. Klimek, P.E. Director
Division of Water Quality
November 17, 2006
Gregory G. Bean, Directorate of Public Works
Department of the Army, Fort Bragg
Bldg. 3-1631 Butner Road
Fort Bragg, NC 28310
SUBJECT: Stormwater Permit No. SW6061101
M3-00001-6P, Construct Vehicle Maintenance Facility
High Density Development Project
Camp MacKall-Fort Bragg, Richmond County
Dear Mr. Bean:
The Fayetteville Regional Office received a complete Stormwater Management Permit
Application for the M3-00001-6P, Construct Vehicle Maintenance Facility project on November 6,
2006. Staff review of the plans and specifications has determined that the project, as proposed, will
comply with the Stormwater Regulations set forth in Tide ]'SA NCAC 211 .1000. We are forwarding
herewith Permit No. SW6061 101 dated November 17, 2006, for the construction and maintenance of
stormwater treatment facilities associated with the M3-00001-6P, Construct Vehicle Maintenance
Facility project.
This permit shall be effective from the date of issuance until November 17, 2016, 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, 6714 Mail
Service Center, Raleigh, NC 27699-6714. Unless such demands are made, this permit shall be final and
binding.
If you have any questions, or need additional information concerning this matter, please contact
Mr. Michael Lawyer at [phone].
Sincerely,
jam) ,
Belinda S. Henson
Regional Supervisor
Surface Water. Protection Section
BSH: ML/ml
cc: Robert Tuttle -Authorized Agent
FRO -Surface Water Protection
Water Quality Central Files
NorthCarolina
Naturally
North Carolina Division of Water Quality 225 Green Street, Suite 714 Fayetteville, NC 28301.3043 Phone [phone] Customer Service
Internet: vww ncwatergoality.or2 Fax [phone]' 1-877-623-6748
An Equal OpportunitylAfiirmalive Action Employer — 50°i6 Recycled/10% Post Consumer Paper

STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES
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
Department of the Army, Fort Bragg
M3-00001-6P, Construct Vehicle Maintenance Facility
Camp illlacKall-Fort Bragg, Richmond County
FOR THE
construction, operation and_maintenance of three (3) bioretention areas 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 November 17,2016 and shall be subject to
the following specified conditions and limitations:
1. 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 pages 4-6 of this permit, the Project Design Data Sheets. Stormwater from the
paved road along the west side of the property will be directed into Bioretention Area 'A' over a
grassed buffer strip. Stormwater from the vehicle maintenance area and parking lot will be
directed through one of two ribbed concrete channels to reduce flow velocity and/or through one
of two grass -lined channels along the north and south of the property into Bioretention Areas 'B'
and 'C' also over a grassed buffer strip. Also, any overflow from Bioretention Area 'A' will
flow via the grass -lined channel along the north into Bioretention Area'C'. The stormwater
controls have been designed to handle the runoff from 2.11 acres with approximately 61,298
square feet, or 66.5%, of impervious surface.
3. Approved plans and specifications for this project are incorporated by reference and are
enforceable parts of the permit.
4. The runoff from all built -upon areas within the permitted drainage areas of this project must be
directed into the permitted stormwater control systems. A permit modification must be
submitted and approved prior to the construction of additional built -upon areas.
5. The built -upon area for any future development is not included in this permit. A permit
modification must be submitted and approved prior to the construction of additional built -upon
areas.
-2-

6. The drainage area for each bioretention area must be less than 5 acres.
•
The minimum width for each bioretention area should be 15'. The minimum length for each
bioretention area should be 40'. For widths greater than 20', the length should be at least twice
the width.
8. The minimum required surface area for each bioretention area should be 5% (with sand bed) of
the combined Rational "C" runoff coefficient multiplied by the drainage area.
The sizing rule is based on a bioretention area infiltrating precipitation events of 0.5" to 0.7"
occurring over a six -hour period.
10. The drawdown time for each bioretention area should be less than 4 days.
11. For an average tree spacing of 12' and an average shrub spacing of 8', the minimum stem count
for each bioretention area is 1,000 trees and shrubs per acre of drainage area.
12. There should be at least 2 to 3 shrubs provided for each tree.
13. At installation, trees should be 2.5" in caliper. Shrubs should be at least 3' to 4' in height or
have an 18"-24" spread.
- 3 -

DIVISION OF WATER QUALITY
PROJECT DESIGN DATA SHEET-Bioretention Area `A'
Project Name:
M3-00001-6P, Construct Vehicle Maintenance Facility
Permit Number:
SW6061101
Location:
Camp MacKall-Fort Bragg, Richmond County
Applicant:
Department of the Army, Fort Bragg
Gregory G. Bean, Directorate of Public Works
Mailing Address:
Bldg. 3-1631 Butner Road
Fort Bragg, NC 28310
Application Date:
November 6, 2006
Receiving Stream/Index #:
Drowning Creek/14-2-(10.5)
Stream Classification:
C;Sw,HQW
Ponded Area Depth, inches:
6"
Drainage Area, square feet:
NA
Dimensions, L x W, feet:
137.5' x 15'
Total Impervious Surfaces, sq ft:
NA
Offsite Area Entering Pond, sq ft:
5,611
Required Surface Area, sq ft:
250
Provided Surface Area, sq ft:
1,806
Required Storage Volume, cu f:
1,000
Provided Storage Volume, cu ft:
7,224
Draw Down Time, hours:
< 96 hours
Number of Trees Provided:
3
Number of Shrubs Provided:
14
Minimum Stem Count:
17

DIVISION OF WATER QUALITY
PROJECT DESIGN DATA SHEET-Bioretention Area `B'
Project Name:
M3-00001-6P, Construct Vehicle Maintenance Facility
Permit Number:
S W6061101
Location:
Camp MacKall-Fort Bragg, Richmond County
Applicant:
Department of the Army, Fort Bragg
Gregory G. Bean, Directorate of Public Works
Mailing Address:
Bldg. 3-1631 Butner Road
Fort Bragg, NC 28310
Application Date:
November 6, 2006
Receiving Stream/lndex #:
Drowning Creek/14-2-(10.5)
Stream Classification:
C;Sw,HQW
Ponded Area Depth, inches:
6"
Drainage Area, square feet:
50,349.56
Dimensions, L x W, feet:
93.75' x 35'
Total Impervious, Surfaces, sq ft:
30,209.50
Offsite Area Entering Pond, sq ft:
NA
Required Surface Area, sq ft:
1,200
Provided Surface Area, sq ft:
3,196
Required Storage Volume, cu tt:
4,800
Provided Storage Volume, cu ft:
12,784
Draw Down Time, hours:
<.96 hours
Number of Trees Provided:
3
Number of Shrubs Provided:
25
Minimum Stem Count:
28
-5-

DIVISION OF WATER QUALITY
PROJECT DESIGN DATA SHEET-Bioretention Area'C'
Project Name:
Iv13-00001-6P, Construct Vehicle Maintenance Facility
Permit Number:
SW6061101
Location:
Camp MacKall-Fort Bragg, Richmond County
Applicant:
Department of the Army, Fort Bragg
Gregory G. Bean, Directorate of Public Works
Mailing Address:
Bldg. 3-1631 Butner Road
Fort Bragg, NC 28310
Application Date:
November,6, 2006.
Receiving Stream/index #:
Drowning CreekA 4-2-(10.5)
Stream Classification:
C;Sw,HQW
Ponded Area Depth, inches:
6"
Drainage Area, square feet:
41,771.31
Dimensions, L x W, feet:
93.75' x 35'
Total Impervious.Surfaces, sq ft:
31,088.50
Offsite Area Entering Pond, sq ft:
NA
Required Surface Area, sq ft:
1,200
Provided Surface Area, sq ft:
3,196
Required Storage Volume, cu ft:
4,800
Provided Storage Volume, cu ft
12,784
Draw Down Time, hours:
< 96 hours
Number of Trees Provided:
3
Number of Shrubs Provided:
25
Minimum Stem Count:
28

11. SCHEDULE OF COMPLIANCE
l . 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.
2. During construction, erosion shall be kept to a minimum and any eroded areas of the system will
be repaired immediately.
3. The permittee shall at all times provide the operation and maintenance necessary to assure the
permitted stormwater system functions at optimum efficiency. The approved Operation and
Maintenance Plan must be followed in its entirety and maintenance must occur at the scheduled
intervals including, but not limited to:
a. Monthly scheduled inspections.
b. Remulch any void areas by hand when need.
C. Replace mulch layer every two to three years.
d. Immediate repair of eroded areas.
e. Maintenance of side slopes in accordance with approved plans and specifications.
f Debris removal within the ribbed concrete channels, grass -lined channels and
bioretention areas.
g. Access to the outlet structure must be available at all times.
h. Remove and replace all dead or diseased vegetation at least twice per year, preferably in
the spring and fall.
i. Treat diseased trees and shrubs as needed.
j. Provide sufficient irrigation to ensure that the plant life will live.
k. Replace support stakes annually as needed, preferably in the spring.
4. Records of maintenance activities must be kept and made available upon request to authorized
personnel ofDWQ. The records will indicate the date, activity, name of person performing the
work and what actions were taken.
5. 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.
6. 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.
7. If the stormwater system is 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.
8. Any modifications must be permitted prior to construction. The following items will require a
modification to the permit. The Director may determine that other revisions to the project should
require a modification to the permit.
a. Any revision to the approved plans, regardless of size.
b. Project name change-
C. Transfer of ownership.
d. Redesign or addition to the approved amount of built -upon area.
e. Further subdivision, acquisition, or sale of the project area. The project area is defined as
all property owned by the permittee, for which Erosion and Sedimentation Control Plan
approval was sought.
-7-

f. Filling in, altering, or piping of any vegetative conveyance shown on the approved plan.
9. A copy of the approved plans and specifications shall be maintained on file by the permittee for a
. minimum of ten years from the date of completion of construction.
10. Prior to the sale of any portion of the property, 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 of any portion of the property.
11. The permittee is responsible for verifying that the proposed built -upon area does not exceed the
allowable built -upon area.
12. 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 of 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.
13. The permittee shall notify the Division of any name, ownership or mailing address changes
within 30 days.
III. GENERAL CONDITIONS
This permit is not transferable to any person or entity except after notice to and approval by the
Director. In the event there is either a desire for the facilities to change ownership, or there is a
name change of the Permittee, a "Name/Ownership Change Form" must be submitted to the
Division of Water Quality accompanied.by appropriate documentation from the parties involved.
This may include, but is not limited to, a deed of trust, recorded deed restrictions, Designer's
Certification and a signed Operation and Maintenance plan. The project must be in good
standing -with DWQ. The approval of this request will be considered on its merits and may or
may not be approved.
2. The permittee is responsible for compliance with all of the terms and conditions of this permit
until such time as the Director approves the transfer request.
3. 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.
4. 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) that have jurisdiction.
5. 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.
6. 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. Permittee grants permission to staff of the DWQ to access the property for the purposes of
inspecting the stormwater facilities during normal business hours.
-8-

Permit issued this the seventeenth day of November 2006.
NORTH CAROLINA ENVIRONMENTAL MANAGEMENT COMMISSION
Alan W. Klimek, P.E., Director
Division of Water Quality
By Authority of the Environmental Management Commission
Permit No. SW6061101
-9-

M3-00001-6P, Construct Vehicle Maintenance Facility
Stormwater Permit No. SW6061101
Camp MacKall-Fort Bragg, Richmond County
Designer's Certification
1, , 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 a part of this Certification.
Noted deviations from approved plans and specifications:
SEAL
Signature
Registration Number
Date

Certification Requirements:
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.
All the built -upon area associated with the project is graded such that the runoff drains to
the system.
All roof drains are located such that the runoff is directed into the system.
5. 'Be outlet/bypass structure elevations are per the approved plan.
The outlet structures are located per the approved plans.
7. Trash rack is provided on the outlet/bypass, structures.
8. All slopes are grassed with permanent vegetation.
9. Vegetated slopes are no steeper than 3:1.
10. The inlets are located per the approved plans and do not cause short-circuiting of the
system.
.11. The permitted amounts of surface area and/or volume have been provided.
12. Required drawdown devices are correctly sized per the approved plans.
13. All required design depths are provided.
14. All required parts of the system are provided, such as a vegetated shelf, a forebay, and the
vegetated filter.
15. The required dimensions of the system are provided, per the approved plan.

71e&
Gy /fit 761

TF9
Michael F. Easley, Govemor
William G. Ross Jr., Secretary
North Carolina Department of Environment and Natural Resources
Also W. Klimek, P.E. Director
Division of Water Quality
October 16, 2006
CERTIFIED MAIL: 7001 2510 0006 9498 9258
RETURN RECEIPT REQUESTED
Gregory G. Bean, Directorate of Public Works
Bldg. 3-1631 Butner Road
Fort Bragg, NC 28310
SUBJECT: REQUEST FOR APPLICATION
M3-00001-6P, Construct Vehicle Maintenance Facility
Camp MacKall-Fort Bragg, Richmond County
Dear Mr. Bean:
Please find enclosed the completed stream classification request form for the M3-00001-6P,
Construct Vehicle Maintenance Facility project in Richmond County. Based on project location
information provided on the USGS quad sheet that was included with the classification request form, it
has been determined that stormwater from this project will drain to a section of Drowning Creek
described as "From a point 0.4 mile upstream of U.S. Hwy 1 to Lumber River" in the Lumber River
Basin. Due to the classification of that section of Drowning Creek as High Quality Water and the
distance from the project area to the tributary/stream being less than one mile, a Stormwater
Management Permit is required for this project prior to the construction of any built -upon areas.
To acquire the Stormwater Management Permit, please complete and submit to this office Form
S W U-101, any and all applicable supplement forms and the appropriate fee of $420, which must be in
the form of a check made payable to the North Carolina Department of Environment and Natural
Resources (NCDENR). You can find Form SWU-101 and all applicable supplement forms on our
website at the following link: www.ncwaterquality.org/su/Forms_ Documents.htlll#sswmp. Also
enclosed is a checklist of submittal requirements for your reference.
If you have any questions regarding this matter, please contact me at 910-433-3329.
Sincerely,
Michael Lawyer
Environmental Technician
Enclosures(2)
cc: FRO -Surface Water Protection
ow
IAIAWilralllf
North Carolina Division of Water Quality 225 Green Street. Suite 714 Fayetteville, NC 28301-5043 Phone [phone] Customer Service
.Internet cvww,newaleroualitv.ora Fax [phone]
An Equal OpportunitylAffirmalive Action Employer —50'/ Recycledll0% Post Consumer Paper

: 3
Q
Poa'go
7
tr
Certified Fee
E 1 1ED
TttC3(Endorsement
ReturnReceipt Fee
Required)O
C3
Restdeted Do Wery Fee
O
(Endomement Required)
Postma*
Ham
C3 Total Postage 6 Fees
Ln Sent To
ti
............ .. ..._iV/CrU....................................___ __.........
,a reet,
p or PO Box
tY sµw.zla.a ... ................
-)'S rwnI JUW.,I:nnmry 2001 — — Stt Rcvursc lu,InsLuclionsI

State of North Carolina
Department of Environment and Natural Resources
Division of Water Quality
WATER QUALITY CLASSIFICATION REQUIiST FORM
"Ibis form may be photocopied for use as an original.
In order to determine whether a State Stonnwater Management Permit will be required for a project located
within a high Quality Water (I IQW) or Outstanding Resource Water (OR W) zone, the classification of the
closest downslope surface waters (the surface waters that any sheet flow or overflow from the project
would flow toward) must be determined. It is required that the same authorized person that obtained the
Approved Erosion and Sedimentation Control Plan complete only Section I and 11 below. Division of
Water Quality staff will determine the receiving stream classification, complete Section III and return the
completed form to you.
1. PROJEC"r INFORMATION
M3-0o0o1 G?
I. Project Name: C.o"S-T9,p -T VENtc E MA14-1 'Fa . County: RtGNffotilD
2. Authorized Contact Person (print): GfZ,Er g�.A, i
3. Mailing Address: $L.t�)G,. 3- 1631 �u ltivR ROFaU
4. City: OAT State: _ '� zip code: 293l0 Phone #: q 103
5. Name of closest downslope surface
6. Signature of Contact Person:
(To be signed by the same person or
7. Is an Erosion & Sedimentation
II. REQUIRED ITEMS
Date:
IS on the Approved Erosion & Sedimentation Control Plan)
Plan required? Yes No
An 8.5" x I I" copy of the appropriate portion of a USGS quad sheet clearly showing the project's property
boundaries, receiving stream, major roads or State Road numbers and the nearest [own or city.
III. CLASSIFICATION REQUEST (To be completed by Regional Office personnel)
I. Name Of9urface Water:
[� _ V ll
2. River Basin: /�Upo &, Stream Index: 1-2 — A •S'�/
3. Classification (as established by the Environmental Management Commission): (�• St✓.H �✓
4. Proposed Classification, if applicable:
y '1
5. Approximate distance in fee[ from project site if classification is HQW:
6. State Stonnwater Management Pennit required'? Yes- o
7. Signature of Regional Office personnel: Date: b Q

Michael F. Easley, Govemor
William G. Ross h., Secretary
North Carolina Department of Environment and Natural Resmirces
Nan W. Klimek. 11.17. Director
Division of Water Quality
September 25, 2006
CERTIFIED MAIL: 7001 2510 0006 9498 9326 ®�0n 1
�_ ���
RETURN RECEIPT REQUESTED OCT 1626
Gregory G. Bean, Directorate of Public Works DWO
Bldg. 3-1364 Butner Road
Fort Bragg, NC 28310-5000
SUBJECT: REQUEST FOR STREAM CLASSIFICATION
M3-00001-6P, Construct Vehicle Maintenance Facility
Camp MacKali-Fort Bragg
Dear Mr. Bean:
On September 20, 2006, the Fayetteville Regional Office of the Division of Water Quality
received a copy of the Letter of Approval with Modifications dated September 19, 2006 for the M3-
00001-6P, Construct Vehicle Maintenance Facility project located at Camp MacKall. A review of the
location of this project shows that it may be within a High Quality Water zone. State regulation 15A
NCAC 02H .1003 requires that any development activity that is required to obtain either a CAMA major
permit within the twenty coastal counties or an approved Erosion and Sedimentation Control Plan in
which the project is draining to Outstanding Resource Waters or within one mile of and draining to High
Quality Waters to apply for and obtain a Stormwater Management Permit. In order to determine if a
Stormwater Management Permit will be required for this project, this office must verify the
classification of and distance to the receiving waters. Please return the enclosed classification request
form with a color copy of that portion of the USGS quad sheet with the project and the.closest
downslope named receiving waters clearly identified.
Upon classification of the receiving waters by this office, you will be sent either a Stormwater
Management Permit application via certified mail or a letter stating that a Stormwater Management
Permit is not required for this project. The local governing authority for compliance must review
projects that drain to Water Supply Watersheds.
Please be advised that construction of any built -upon areas prior to receipt of a Stormwater
Management Permit, if required, will be considered a violation of the North Carolina Administrative
Codes. If you have any questions concerning this matter, please call me at 910-433-3329.
Sincerely,
t�'
chacl Lawyer
Environmental Technician
Enclosure
NorthCarolina
"Alatara//y
North Carolina Division of Water Quality 225 Green Street. Suite 714 Fayetteville, NC 28301-5043 Phone [phone] Customer Service
Internet: www.ncwateroualitv.ore Fa.e [phone] 1-877-623-6748
An Equal OpportunitylAlfirmative Action Employer —50% Recycledl101/. Post Consumer Paper

UNITED STATES POSTALSERVICE
I I I I I I PUSP
erms First-Class
G 10 Postage & Fees Paid
• Sender: Please print your name, address, and ZIP+4 in this box
%LC
27-5
ay, G„t it ter,-
I

A TLLA
NCDENR
North Carolina Department of Environment and
Division of Land Resources
James D. Simons, PG, PE Land Quality Section
Director and State Geologist
September 19, 2006
Natural Resources
LETTER OF APPROVAL WITH MODIFICATIONS
Directorate of Public Works
Attn: Gregory G. Bean
Bldg. 3-1634 Butner Road
Fort Bragg, NC 28310-5000
RE: Project Name: M3-00001-6P, Construct Vehicle Maintenance Facility
Acres Approved: 2.11
Project ID: Bragg-2007-006
County: Fort Bragg Camp MacKall Special Forces Way
River Basin: Lumber Stream Classification: HOW
Submitted By: Directorate of Public Works
Date Received by LQS: 9/14/2006
Plan Type: Express
1917MOV ti1111lin".1
Michael F. Easley, Governor
William G. Ross Jr., Secretary
This office has reviewed the subject erosion and sedimentation control plan. We find the
plan to be acceptable with modifications and hereby issue this letter of Approval With
Modifications. The Modifications Required for Approval are listed on the attached page. This
plan approval shall expire three (3) years following the date of approval, if no land -disturbing
activity has been undertaken, as is required by Title 15A NCAC 4B .0129.
Please be advised that Title 15A NCAC 4B .0118(a) requires that a copy of the approved
erosion control plan be on file at the job site. Also, you should consider this letter to,give the
Notice required by G.S. 113A-61.1(a) of our right of periodic inspection to insure compliance
with the approved plan.
- North Carolina's Sedimentation Pollution Control Program is performance -oriented;
requiring protection of existing natural resources and adjoining properties. If, following the
commencement of this project, it is determined that the erosion and sedimentation control plan is
inadequate to meet the requirements of the Sedimentation Pollution Control Act of 1973 (North
Carolina General Statute 113A-51 through 66), this office may require revisions to the plan and
implementation of the revisions to insure compliance with the Act.
Fayetteville Regional Office
225 Green Street — Suite 714, Fayetteville, North Carolina 28301 • Phone: [phone] / FAX: [phone]

`t'Letterof Approval with Modifications
Gregory G. Bean ..
September 19 2006
Page 2 of 3
Acceptance and approval of this plan is conditioned upon your compliance with Federal
and State water quality laws, regulations, and rules. In addition, local city or county ordinances
or rules may also apply to this land -disturbing activity. This approval does not supersede any
other permit or approval.
Please be aware that your project.will be covered by the enclosed NPDES General
Stormwater Permit NCGO1000 (Construction Activities). You should first become familiar with
all of the requirements for compliance with the enclosed general permit.
Please note that this approval is based in part on the accuracy of the information provided
in the Financial Responsibility Form, which you have provided. You are requested to file an
amended form if there is any change in the information included on the form. In addition, it
would be helpful if you notify this office of the proposed starting date for this project. Please
notify us if you plan to have a preconstruction conference.
Your cooperation is appreciated.
Sincerely,
Steve Cook, C.P.E.S.C.
Land Quality Section
Enclosures: Certificate of Approval
Modifications Required for Approval
NPDES Permit
Cc: Directorate of ENV & PW
Belinda Henson, Division of Water Quality
Land Quality Section

Letter of Approval with Modifications
Gregory G. Bean
September 19, 2006
Page 3 of 3
MODIFICATIONS REQUIRED FOR APPROVAL
Project Name: M3-00001-6P, Construct Vehicle Maintenance Facility
Project ID: Bragg-2007-006
County: Fort Bragg
This project is located within a High Quality Water (HQW) zone. All requirements
regarding sensitive area watersheds should be followed.
The updated version of the N. C. Erosion and Sediment Control Planning & Design
Manual is now posted on the Land Quality web site at
http://www.dir.enr.state.nc.us/sages/manualsandvideos.htmi Revision packets have been
mailed to people who have previously purchased manuals, and returned a postcard
verifying their current address. If you have a manual and did not receive a postcard due to
a change in address, please send an email to Stephan ie.Lane(a�ncmail.net Include your
name and mailing address and the serial number on the first page of your manual (if
available).
The Sedimentation Control Commission approved a motion at the May 18, 2006 meeting to
allow the use of either the old or new practice standards and specifications through the end
of 2006. The new practice standards and specifications must be used on plans submitted on
or after January 1, 2007. The use of the new practice standards and specifications is
encouraged.

a
I. If i;4
byVAQ ESP 4-1.q71wq ph", Si: y Incy: or ROO! qv 01me nPvtq"wq , 'i
'JA Y f'' s Q , 'VL y, if. 1 w L :,Yr. a M V ­1 V. 410%21� a, 1. Is , , Q, ,
j!" Jow.1 c1mus"wals St? ltswq a -Merl w 4: 1P. 1-rd 1R, ;yv lums,ml. a �
I PC Ow a) A A Q Vol?" f Ph Jel by Solt, A w". Is In mul ;q
SWA "K, Z15j" jck.. 1i "vq n�y U wit A LA
Tj 411l ;'r, J'Yl I
pGoWnq mfolm iwo p pin" Us! -mill"fAulf :7wityl ly" qvx
WAAmT.
; 110 11 A- t 1 wo A 4 Upy 1 n v m v u 0m; v 6 h it;

w�v� --I
r 'C
September 20, 2006
Gregory G. Bean
Director of Public Works
Bldg. 3-1634 Butner Road
Fort Bragg, NC 28310-5000
Michael F. Easley, Governor
William G. Ross Jr., Secretary
North Carolina Department of Environment and Natural Resources
SUBJECT: NPDES General Stormwater Permit No. NCGO10000
Project ID: Bragg-2007-006
M3-00001-6P, Construct Vehicle Maintenance Facility
Fort Bragg
Dear Mr. Bean:
Alan W. Klimek, P.E., Director
Division of Water Quality
Recently you were sent a letter from the Division of Land Resources (DLR) regarding approval
of your Sedimentation and Erosion Control Plan for the subject development project. Accompanying the
DLR letter was a National Pollutant Discharge Elimination System (NPDES) General Stormwater
Permit No. NCGO10000. That permit authorizes you to discharge stormwater tothe surface waters of
North Carolina. Those point source discharges are associated with activities such as clearing, grading,
and other land disturbing and construction activities.
The purpose of this letter is to draw your attention to and to stress the importance of that NPDES
General Stormwater Permit. The requirements contained in the stormwater permit coupled with the
requirements called for by the Division of Land Resources are vitally important to the protection of the
waters of the State. If you have not already done so, you are urged to immediately read and adhere to
the stormwater permit requirements contained there in. Of particular importance are Parts I and II of the
permit.
Parts I and I1 set forth the minimum visual monitoring and reporting requirements for your
stormwater discharge. In particular, Part 1, Section B describes the visual monitoring frequencies and
locations, the requirement to maintain a rain gauge onsite, and the need to maintain a written record of
'all inspections.Upon' commenc'crnent of you''r"land'disturbing' activiiy,'you'rnust initiate the visual
q'mon-toring'and iecord-'keeping requirements as'calle&for in the,permit. !)The visual'm"onitoring•data
results,''al'ong` with lall other'permit'required records must be maintained'6n7-site`and'made' available to
.-.,.Division of Water Quality representatives upon request and/or during upcoming inspections. The
%remaining partslof he!Permitset forth definitions, general conditions'and Special -conditions applicable
to stormwater discharge(s). The conditions include special reporting requirements in the event of
noncompliance, bypasses, treatment unit/process failures, etc.
No t arolma
North Carolina Division of Water Quality 225 Green Street— Suite 714 Fayetteville, NC 28301-5043 Phone [phone] Customer Service
Internet: v .navaterquality.org FAX [phone]
An Equal Opportunity/Affirmative Action Employer— 50% Recycled/l0% Post Consumer Paper

Gregory G. Bean
Page 2
September 20, 2006
This letter is also meant to advise you that should you fail to comply with the terms and
conditions of the permit you could be subject to enforcement as called for in Section 143-215.6 of the
North Carolina General Statutes. A civil penalty (fine) of up to $25,000 per violation per day may be
assessed for such violations. We ask that if you find at any time that you are unable to comply with the
terms and conditions of the Permit, that you contact this Office immediately.
As mentioned previously, the purpose of this letter is to advise you of the importance of the
NPDES General Stormwater Permit and by this notification prevent unnecessary impacts to the waters
of the State. Again, if you have not already done so, please read the permit and contact Mr. Michael.
Lawyer or Mr. Chad Turlington of this Office at [phone] if you have any questions or need
clarification.
Sincerely,
2E ,
Belinda Henson
Regional Supervisor
Surface Water Protection Section
BH/bsm
Cumberland County Stormwater Files
DWQ Central Files

W A7-k ,o Michael F. Easley, Governor
` 9 William G. Ross Jr., Secretary
r North Carolina Department of Environment and Natural Resources
5 ..
Alan W. Klimek, P.E. Director
Division of Water Quality
September 25, 2006
CERTIFIED MAIL: 7001 2510 0006 9498 9326
RETURN RECEIPT REQUESTED
Gregory G. Bean, Directorate of Public Works
Bldg. 3-1364 Butner Road
Fort Bragg, NC 28310-5000
SUBJECT: REQUEST FOR STREAM CLASSIFICATION
M3-00001-6P, Construct Vehicle Maintenance Facility
Camp MacKall-Fort Bragg
Dear Mr. Bean:
On September 20, 2006, the Fayetteville Regional Office of the Division of Water Quality
received a copy of the Letter of Approval with Modifications dated September 19, 2006 for the M3-
00001-6P, Construct Vehicle Maintenance Facility project located at Camp MacKall. A review of the
location of this project shows that it may be within a High Quality Water zone. State regulation 15A
NCAC 02H .1003 requires that any development activity that is required to obtain either a CAMA major
permit within the twenty coastal counties or an approved Erosion and Sedimentation Control Plan in
which the project is draining to Outstanding Resource Waters or within one mile of and draining to High
Quality Waters to apply for and obtain a Stormwater Management Permit. In order to determine if a
Stormwater Management Permit will be required for this project, this office must verify the
classification of and distance to the receiving waters. Please return the enclosed classification request
form with a color copy of that portion of the USGS quad sheet with the project and the -closest
downslope named receiving waters clearly identified.
Upon classification of the receiving waters by this office, you will be sent either a Stormwater
Management Permit application via certified mail or a letter stating that a Stormwater Management
Permit is not required for this project. The local governing authority for compliance must review
projects that drain to Water Supply Watersheds.
Please be advised that construction of any built -upon areas prior to receipt of a Stormwater
Management Permit, if required, will be considered a violation of the North Carolina Administrative
ail •-Codes9:_lf-you have any questions concerning this matter, please call me at 910-433-3329.
Sincerely,
ichael Lawyer O �
Environmental Technician
Enclosure
North Carolina
Naturally
North Carolina Division of Water Quality 225 Green Street, Suite 714 Fayetteville, NC 28301-5043 Phone [phone] Customer Service
Internet: wwomcwatemuality.ore Fax [phone]
An Equal Opportunity/Affirmative Acton Employer —50°h necycledlt 0% Post Consumer Paper

J
State of North Carolina
Department of Environment and Natural' Resources
Division of Water Quality
WATER QUALITY CLASSIFICATION REQUEST FORM
This form may be photocopied for use as an original.
In order to determine whether a State Stonnwater Management Permit will be required for a project located
within a High Quality Water (HQW) or Outstanding Resource Water (ORW) zone, the classification of the
closest downslope surface waters (the surface waters that any sheet [low of overflow fi-om the project
would [low toward) must be determined. It is required that the same authorized person that obtained the
Approved Erosion and Sedimentation Control Plan complete only Section I and 11 below: Division of
Water Quality staff will determine the receiving stream classification, complete Section III and return the
completed form to you.
1. PROJECT INFORMATION
I . Project Name:
2. Authorized Contact Person (print):
3. Mailing Address:
4. City:
County:
State: zip code: Phone #:
5. Name of closest downslope surface water:
6. Signature of Contact Person: _ Date:.
(To be signed by the same person or Authorized Agent as on the Approved Erosion & Sedimentation Control Plan)
7. Is an Erosion & Sedimentation Control Plan required? . Yes_ No
IL REQUIRED ITEMS
An 8.5" xI.I" copy of the appropriate portion of a USOS quad sheet clearly showing the project's property
boundaries, receiving stream, major roads or State Road numbers and the nearest town or city.
Ill. CLASSIFICATION REQUE.ST(To be completed by Regional Office personnel)
l . Name of surface water:
2. River Basin: Stream Index:
3.. :. Classification (as established by the Environmental Management Commission):
4. Proposed Classification, if applicable:
T '1 5._ Approximatbdistanceinfeehfrom p'roject'stfeifclassificationtsHQW`` " •-w='-t' ^•'�`--^ `- u-y"•"`c'^^"
6. State Stormwater Management Permit required? Yes_ No
7. Signature of Regional Office personnel: Date:

STORMWATER MANAGEMENT PLAN
Project No. M3-00001-6P
Construct Vehicle Maintenance Facility
at
Rowe Training Facility
Camp MacKall, NC
October 2006
Department of the Army
Directorate of Public Works
Fort Bragg, NC

ti
m
E
alD Postage $ 3 Ur-
cr Certified Fee
Postmark
.0 Return Receipt Fee Here
0 (Endorsement Required)
C3 Restricted Delivery Fee
O (Endorsement Required)
Total Postage d Fees
rLI Sent To rnM ^ ^.
Stree[ Apt. No.. -- - \/_..____ _..
t� or Po Box No.
--------- -- -- - --- - -----3-- -a- ---f - Bul oh - .....
� Ci tote, ZIP+4
o2mo-5voo

153-00001-5P, Construct Vehicle Maintenance Facility Rowe Training Facility, Camp MaCKall, NC
NARRATIVE
Prolect Description
The purpose of the project is to construct a 45' x 60' vehicle
maintenance facility with a 180, x 320' parking area and a perimeter security
fence. The facility will be used to conduct minor field vehicle maintenance
and to park/secure Government Owned Vehicles (GOVs). The site is located
within Camp MacKall's Rowe Training Area, Richmond County, NC, and west of
Special Forces Way at 35.04840 N 79.49041 W. The total project area is
approximately 2 acres.
Site Description
Historical records identify the site as an old rail yard. The tracks
and warehouse have been removed with only the warehouse's concrete pads
remaining. The site is mostly flat with slopes ranging from 0.25& to 1%.
There is little to no runoff from this project site to adjacent areas. The
site primarily drains to the east between the rows of concrete slabs and then
ponds along the western road edge of Special Forces Way. During heavy rains,
the ponding water will overflow into a 100 feet wide grassy buffer area and
then overflows into some pine woodlands located along the northern edge of
the lot. There are two large hardwood trees on the northwestern corner of
the project site, which stand outside the construction limits for this
project. No trees will be disturbed during the construction of this
facility.
Adjacent Areas
The site is located approximately 750 feet within the property of a
U.S. military installation, Camp MacKall, used for military range and
training operations. Areas to the south and north consist of forest stands
of long -leaf pines. The area to the west is lightly vegetated with shrubs
and small scrub trees and falls within the Clear Zone of MacKall Airfield.
The area to the east; across Special Forces Way, is Camp MacKall's Rowe
Training Facilities. The only runoff onto the site comes primarily from
adjacent roads and streets.
Soils
WCB — Wakulla and Candor soils, 0 to 8 percent slopes
Description: This map unit consists of nearly level to gently sloping
Wakulla soils and candor soils on uplands and stream terraces of the Sand
Hills. These soils are very deep and somewhat excessively drained. Wakulla
soils formed in sandy wind blown, marine, or fluvial sediments. They have a
sandy surface and subsoil. Permeability is rapid and shrink -swell potential
is low. Seasonal high ,water table is below 6.0 feet. Candor soils formed in
sandy and loamy Coastal plain sediments. They have a sandy surface layer and
subsurface layer. The surface and subsurface layers are 20 to 40 inches
thick. The subsoil is loamy. Permeability is rapid in the surface and
moderate in the subsoil. Shrink -swell potential is low. Seasonal high water
table is greater than 6.0 feet below the surface.
USDA Soil Texture: Sand (92.8% Sand, 2.58 Silt, and 4.7% Clay)
Soil Erodibility Factor (K value): 0.11
Slope: 0.25% - 18

P t
r ', '.'JITED S7A,I�Fi$c:'QS�7'�L $EFiV1�,E rt Y Nt tY' si >L � yr -'w,.. iFirNtl:le � j
amd1Y UO}�f3 �G �4A$Lf o u,4f`rFll i
• Sender: Please print your name, address,
7LC k�l kw(V ,
2z5 Cahjj, SL, Suite. 7 I I
r4a y,e ttwUtv, 71,L a8301- 5043
I„i,iLJ„rA IL,,,IIIId,LIL.,Ifill III LLJ,i,i„III Id
IF

N3-00001-5P, Construct Vehicle Maintenance Facility Rowe Training Facility, Camp MacKall, NC
Plasticity Index and Liquid Limit: PL = NP, LL = 7.78-14.4%
Permeability: Saturated hydraulic conductivity= 41.11-138.25 micro m/sec
High Water Table: greater than 6 feet below surface
Soil Reaction, (pH): 4.3-6.0
Hydrologic Group: A (low runoff potential)
Engineering Classification:
Depth (Inches)
USDA texture
Unified
ASSHTO
Coarse sand, Fine
0 7
sand, Sand
SP-SM
A-3
Coarse sand, Fine
7 24
sand, Sand
SP-SM
A-3
Loamy course sand,
24-42
Loamy fine sand,
SC-SM, SM, SP-BM
A-2-4
Loamy sand
Course sand, Fine
42-85
sand, Sand
SM
A-2, A-3
Stormwater Best Management Practices (April 1999)
1. Bioretention Areas - 4.0: Bioretention areas to be located on the east
and west ends of the project site, adjacent to the parking area. The
bioretention areas provide infiltration and water storage for uptake by
vegetation. The surface of the planting soil is depressed to allow for
some ponding of the runoff. The runoff is infiltrated through a surface
organic layer of mulch and/or a ground cover to the planting soil. The
runoff is stored in the planting soil where it is discharged over a period
of days to the in -situ material underlying the bioretention area. The
assumed TSS removal is 85%.
• Bioretention Area `A': Bioretention Area `A' size is 1,806 square
feet. Sheet flow from the paved road on its west side discharges into
bioretention area `A' over a grass buffer strip. The runoff is then
infiltrated into a planting media. Once the infiltration capacity of
the planting soil is exceeded; stormwater then flows along the north -
grass -lined channel to Bioretention Area `C' where further infiltration
and water storage operations continue.
• Bioretention Area `B': Bioretention Area `B' size is 3,196 square
feet. Runoff from the south -half of the parking lot is collected in a
Swale and is channeled to a ribbed concrete channel block to reduce the
runoff's flow velocity before entering into Bioretention Area `B' over
a grass buffer strip. Furthermore, runoff collected in the south -
channel also flows into this bioretention area. The runoff is then
infiltrated into a planting media.
Bioretention Area `C': Bioretention Area `C' size is 3,196 square
feet. Runoff from north -half of the parking lot is collected in a
swale and is channeled to a ribbed concrete channel block to reduce the
runoff's flow velocity before entering into Bioretention Area `C'
through a grass buffer strip. Furthermore, runoff collected in the
north -channel also flows into this bioretention area. The runoff is
then infiltrated into a planting media.

0001-5P, Construct vehicle Maintenance Facility Rowe Training Facility, Camp MacRall, NC
2. Grass -Lined Channels - 5.0: Grass -lined channels with temporary straw -net
liners will be constructed along the south and north edge of the newly
constructed parking area to collect and convey runoff from roads and the
parking area to the bioretention areas `B' and `C'. The channels shall
have a triangular "V-shape" cross-section with a top width of 12 feet with
a depth of 1 foot. Side slopes shall be constructed 6:1 or flatter along
the roadway for safety. The assumed TSS removal is 35%.
Maintenance Plan
1. Maintenance Schedule for Bioretention Areas: The table below gives
general guidance regarding methods, frequency, and time of year for
bioretention area and maintenance.
Description
Method
I Frequency
Time of Year
Soil
Inspect and Repair
Visual
Monthly
Monthly
Erosion
Organic Layer
Remulch any void
By hand
Whenever needed
Whenever needed
area
Remove previous
mulch layer before
Bhand
Y
Once every two or
Spring
applying new layer
three years
(optional)
Any additional
mulch added
BY hand
Once a year
Spring
Plants
Remove and
replacement of all
dead and diseased
See planting
3/15 to 4/30 and
vegetation
specifications
Twice a year
10/1 to 11/30
considered beyond
treatment
Varies, but will
Treat all diseased
Mechanical or by
N/A
depend on insect
trees and shrubs
hand
or disease
infestation
Watering plant
material shall
take place at the
end of each day
Immediately after
for fourteen
BY hand
completion of
N/A
consecutive days
project
and after planting
has been completed
Replacement of
By hand
Once a year
Only remove stakes
support stakes
in the spring
Replace any
deficient stakes
By hand
Whenever needed
Whenever needed
or wires
2. Grass -Lined channels: Swale maintenance basically involves normal grass
management activities such as mowing and resodding when necessary and
periodic sediment removal, if significant deposition occurs. Maintenance
shall be performed as follows:

Po3-00001-5P, Construct vehicle Maintenance Facility Rowe Training Facility, Camp Mac Kall, NC
• At least once annually, remove excess sediment, especially from the
upstream edge, to maintain original contours and grading.
• At least once annually, repair any erosion and regrade the swale to
ensure that the runoff flows evenly in a thin sheet through the swale.
• At least once annually, inspect vegetation and revegetate the swale to
maintain a dense growth of vegetation.
• Grassed swales shall be mowed at least twice annually to a maximum
height of six inches.

M3-00001-6P
Construct Vehicle Maintenance Facility
Camp MacKall, Rowe Training Facility, NC OL
J
SING
EISTING GR 4 AIjEA
PROJECT LIMIT LINE �EXI§TIN& CON ETE PADS y _ '`TJ. •aE " ' "" _
/ ESTIA HALPIG ..,'
O
.. EXIST. CONC. PADS "LL J f^! �.�;. �'., I
pe
lot
Hrgr ASPHALT LU
PARKING ... a
LOT �EXI� wGRAAL AA
- .
j7j
•- k
t VEHICLE
�r ': - _,& MAINTENANCE

M3-00001-5P, Construct Vehicle Maintenance Facility Rowe Training Facility, Camp MacKall, NC
Q=CIA
Given:
Drainage area: .................................................................
0.230 acres
Street; asphalt: .................................................................
0. 103 acres
Bare packed soil: .............................................................
0. 127 acres
Max slope length: ...............................................................
180.00 It
Average slope: .........................................................
0.5%, bare earth
Location: .................
Camp MacKall, NC (35.04840N, 79.49041 W)
Find:
Peak runoff rate from 25-yr frequency storm, Q25
Solution:
(6) Drainage area: 0.230 acres (given)
(7) Determine runoff coefficient, C.
Calculate Weighted Average
Land Use Area C from Table 8.03a
Street, asphalt 0.103 x 0.825 = 0.085
Bare packed soil 0.127 x 0.300 = 0.038
0.230 0.123
C = 0.123/0.230 = 0.535
(8) Find the time of concentration using interactions of the kinematic wave equation (Table 8.03a) using a
maximum length of travel = 180.00 It and an average watershed slope of 0.5%. Assume overland flow on
bare earth.
Tc = 5 minutes.
(9) Determine the rainfall intensity factor, I.
i25 = using 25-year storm, 5 minute duration = 8.89 inches/hr*
(*Source: 'Precipitation -Frequency Atlas ofthe United States" NOAA Atlas 14, Volume 2, Version 2)
(10)Q=CIA
Q25 = 0.535(8.89)(0.230) = 1.094 cfs; Use 2 cfs

Rational Method, Q=CIA
Find:
Peak runoff rate from 25-year frequency storm, Q25
Calculate Weighted Average
Land Use
Acres
om
Table
8.03b
Calculate
Weighted
Average
Streets, asphalt
0.103
0.825
0.085
Bare packed soil
0.127
0,300
0.038
0.000
0.000
0.000
0,000
0,000
0.000
0.000
0.000
0.000
0.000
0.123
Drainage area In acres, A = 0 2-3-01 C = 0.535
Step.3. Determinetthe tlme:of;concentratlomiT. ,,: . u4 ..we+ N.
Kinematic Wave Theory
Tc = (LI(a'
Length of ovedand Dow, L =Ml�00
feetManning's
roughness, n =20
(n/rom Table below)
Average watershed slope, S =05
foot per foot
Constant alpha, o =
5.268
Constant, m =
1.667
Rational Coefficient, C =
0.535
Trial Time
of Duration
T, (minutes)
e
Rainfall
Intensity
I, (inches/hour)
Rainfall
Excess
[,(feet/second)
ua
Time of
Concentration
T. (minutes)
Use Rainfall
Intensity of
I = (inches/hour)
9NF5IsM
8.89
0.000110118
5.31
8.89
Iif<P,�1,1011"1
7.09
8.78222E-05
5'.82
n/a
,15IX.i19y,
5.99
7.41968E-05
': 6.22 ,: '''
n/a
MGYA30AM
4.44
5.49973E-05
"7.01
n/a
OUS-ZM60Y
2.95
3.6541E-05
8.26
We
0991111111112011111111
1.80
2.22962E-05
10.06
We
180X ➢W
1.30
1.61028E-05
11 A6
n/a
• 31@}SE360i171M
0.78
9.66168E-06
•s '=,14.06
n/a
ZV720.'@I1N
0.47
5.82178E-06
•'� 17.22
n/a
' p;�1G.1'.4
0.27
3.34443E-06
21.49
n/a
•�.'Q�• ri%- xiiu",', �'k'i..d ifid.�.,��1 A.a4,�.': ";.Zi`a�'" v�+'1 "�a�tth"rr 51. �',°G'.: h1QcA"" ,,k' .�.•�1'�M'id`ia rk'�:.
Rainfall Intensity, I = - 8.89
'' '9e4:4,z% 14. ,!J•1uY Fw.�.i ri�l��ii.Jiu, e. E�Y`ii,,I
Q =
CIA
Runoff coefficient, C =
0.535
Rainfall Intensity, I =
8.890
Drainage area in acres, A =
0.230
Q = 'I 1.0941 cfs
UseF-2--Jcfs

M3-00001-SP, Construct Vehicle Maintenance Facility Rowe Training Facility, Camp MacKall, NC
8.05 DESIGN OF STABLE CHANNELS AND DIVERSIONS (West -Channel)
Design of a grass -lined channel - Permissible Velocity
Given:
Design Q25 = 2 cfs
Proposed channel grade = 0.5%
Proposed vegetation: Bermudagrass
Soil: WcB - Wakulla and Candor, 0 to 8 percent slopes (K = 0.11; NP; Sand)
Permissible velocity, VP = 5.0 ft/s (Table 8.05a)
Retardance class: "B" uncut, "D" cut (Table 8.05c)
V-Shape channel dimensions: Designing for low retardance condition (retardance class D); Design
to meet VP
Find:
Channel dimensions
Solution:
Make an initial estimate of channel size: A = Q/V; 2 cfs/5.0 ft/sec = 0.4 ft'
Depth (d) = 1 ft,
Top width (T) = 6 ft
Slope (Z) = e/d = 3/1 = 3
Cross -Sectional Area (A) = Zdz =, 3* 12 = 3 ftz
Hydraulic Radius (R) = Zd / 24Zz + 1 = 3* 1 / 2q(3z + 1) = 3 / 2410 = 3 / 2*3.162 = 3 / 6.324 = 0.48
An iterative solution using Figure 8.05a to relate flow depth to Manning's n proceeds as follows:
Manning's
equation is used to check velocities (VR = 5.0 x 0.48 = 2.4) *From Fig. 8.05c
Retardance Class "D" cut
d (ft) A (ftz) R (ft) * n V (fps) Q (cfs)
Comments
1.0 3.0 0.48 0.045 1.43 4.29
V<VP:OK
Q>Qzs OK
V = 1.49/n * Rv' * S iu = 1.49/0.045 * 0.4823 * 0.005 vz = 33.11 * 0.61 * 0.071 = 1.43 fps
Q=AV=3 * 1.43=4.29cfs
Retardance Class"B" uncut
d (ft) A (ft') R (ft) * if V (fps) Q (cfs)
Comments
1.0 1.0 0.48 0.085 0.76 2.28
V<VP: OK
Q>Qzs OK
V = 1.49/n * Rv' * Svz = 1.49/0.085 * 0.48v3 * 0.005 112 = 17.53 * 0.61 * 0.071 = 0.76 fps
Q=AV=3 * 0.76 = 2.28 cfs
Channel summary:
V-Shape: d = 1.0 ft, e = 3 ft, T = 6 ft, Z = 3: 1, grade = 0.5%

M3-00001-5P, Construct Vehicle Maintenance Facility Rowe Training Facility, Camp MaCKall, NC
8.03 ESTIMATING RUNOFF into the North -Channel
I:FitC- 1 - IJ,17-1IT•TI
Q = CIA
Given:
Drainage area: .................................................................
0.752 acres
Parking lot; asphalt:
......................................................... 0.613 acres
Roof:................................................................................0.031
acres
Ramp, concrete: ...............................................................
0.0 17 acres
Bare packed soil: .............................................................
0.091 acres
Max slopelength: ...............................................................
320.00 ft
Average slope: ..............................................
0.25%, smooth surface
Location: .................
Camp MacKall, NC (35.04840N, 79.49041 W)
Find:
Peak runoff rate from 25-yr frequency storm, Q25
Solution:
(1) Drainage area: 0.752 acres (given)
(2) Determine runoff coefficient, C.
Calculate Weighted Average
Land Use
Area
Parking lot, asphalt
0.613
Roof
0.031
Ramp, concrete
0.017
Bare packed soil
0.091
0.752
C = 0.573/0.752 = 0.762
C from Table 8.03a
x 0.825 =
0.506
x 0.800 =
0.025
x 0.875 =
0.015
x 0.300 =
0.027
0.573
(3) Find the time of concentration using interactions of the kinematic wave equation (Table 8.03a) using a
maximum length of travel = 320.00 ft and an average watershed slope of 0.25%. Assume overland flow on
smooth surface.
Tc = 5 minutes.
(4) Determine the rainfall intensity factor, I.
i25 = using 25-year storm, 5 minute duration = 8.89 inches/hr"
(*Source: 'Precipitation -Frequency Atlas of the United States" NOAA Atlas 14, Volume 2, Version 2)
(5) Q = CIA
Q25 = 0.762(8.89)(0.752) = 5.091 cis; Use 6 cfs

North -Channel
Rational Method, Q=CIA
Find:
Peak runoff rate from 25-year frequency storm, Qzs
Calculate Welahted Averann
Land Use
Acres
from
Table
8.03b
Calculate
Weighted
Average
Parkin lot, asphalt
0.613
0.825
0.506
0.025
Roof
0.031
0.800
0.875
Ramp, concrete
0.017
0.015
Bare packed soil
0,091
0,300
0,027
0.000
0.000
0.000
0.000
0,000
0,000
0.000
0.000
uara
Drainage area in acres, A = 0.752 C = 0.762
' - )Y m ..r
.. I _ _ - • ... •.. ! a,. �. d%.34.1{� Ir'. r, n�,$,'2'i r 11 i- iv ,...`�r� iL> 1, e1'6,nf,n .t_ Ii u� ,1e4-
Lk
Kinematic Wave Theory
Tc = (LI(e'
Length of overland Flow, L =M3?00
feetManning's
roughness, n =20
(nfrom Table below)
Average watershed slope, S =03
foot per foot
Constant alpha, a =
3.725
Constant, m =
1,667
Rational Coefficient, C =
0.762
Manning's Surface Roughness
n
I y III ISmodih�Surface`',!y�0i01:1
II Bare Earth
01020
Fellow:
0 050
Cultvated, 30% residue:
0.060
Cultvated, an0%residus:
0.1
Grass, short:
0.150
Grass dense
0240
Grass, Bermuda:0.410
Woods light.
0.400
Woods light
0:800
Time
ration
nutes)
LM0000
Rainfall
Intensity
li (inches/hour)
Rainfall
Excess
I, (feeUsewnd)
cMem
Time of
Concentration
T, (minutes)
Use Rainfall
Intensity of
I = (inches/hour)
5PA&I
8.89
0.000156721
8.02
8.89
7.09
0.000124989
8.78.
n/a
m�15MA
5.99
0.000105597
9.39
n/a
i1�130l�
4.44
7.82724E-05
10.59
n/a
i'68EB6omm
2.95
5.20053E-05
12.47
n/a
p1®,1201M
1.80
3.1732E-05
15.19
nla
SIZEGNIRd803N1
1.30
2.29176E-05
1731
rile
0.78
1.37506E-05
2123
n/a
1�720C)r=
0.47
8.28559E-06
26.00
rile
111:440i�A
0.27
4.75981E-06
32.45
n/a
Step4. Determine,the.rainfallantensity.
Rainfall Intensity, I = 8.89
Q =
CIA
Runoff coefficient, C =
0.762
Rainfall Intensity, 1 =.
8.890
Drainage area in acres, A =
0.752
Q = I
5.0911cfs
Use =6 cfs

M3-00001-5P, Construct Vehicle Maintenance Facility Rowe Training Facility, Camp Macxall, NC
8.05 DESIGN OF STABLE CHANNELS AND DIVERSIONS (North -Channel)
Design of a grass -lined channel - Permissible Velocity
Given:
Design Qzs = 6 cfs + 2 cfs flow from west channel = 8 cfs
Proposed channel grade = 0.25%
Proposed vegetation: Bermudagrass
Soil: WeB - Wakulla and Candor, 0 to 8 percent slopes (K = 0.11; NP; Sand)
Permissible velocity, VP = 5.0 fl/s (Table 8.05a)
Retardance class: "B" uncut, "D" cut (Table 8.05c)
V-Shape channel dimensions: Designing for low retardance condition (retardance class D); Design to meet VP
Find:
Channel dimensions
Solution:
Make an initial estimate of channel size: A = Q/V; 8 cfs/5.0 ft/sec = 1.6 ft'
Depth (d) = 1 11,
Top width (T) = 12 R
Slope (Z) = e/d = 6/1 = 6
Cross -Sectional Area (A) = Zdz = 6* 1 z = 6 ftz
Hydraulic Radius (R) = Zd / 2gZ2 + 1 = 6* 1 / 24(6z + 1) = 6 / 2437 = 6 / 2*2.646 = 6 / 5.292 = 1.13
An iterative solution using Figure 8.05a to relate flow depth to Manning's n proceeds as follows:
Manning's
equation is used to check velocities (VR = 5.0 x 1.13 = 5.65) *From Fig. 8.05c
Retardance Class "D" cut
d (ft) A (ftz) R (ft) * n V (fps) Q (cfs)
Comments
1.0 6.0 1.13 0.035 2.30 13.80
V<VP:OK
Q>Qzs: OK
V = 1.49/n * Rv' * S"'= 1.49/0.035 * 1.13"' * 0.0025112 = 42.57* 1.08* 0.05 = 2.30 fps
Q = AV = 6 * 2.30 = 13.80 cfs
Retardance Class"B" uncut
A (ft) A (ft') R (ft) * n V (fps) Q (cfs)
Comments
1.0 6.0 1.13 0.058 138 8.28
V<VP:OK
Q>Qzs OK
V = 1.49/n * R"' * S"2= 1.49/0.058 * 0.482" * 0.0025"' = 25.69 * 1.08 * 0.05 = 1.38 fps
Q = AV = 6 * 1.38 = 8.28 cfs
Channel summary:
V-Shape: d = 1.0 Q, e = 6 ft, T = 12 ft, Z = 6: 1, grade = 0.25%

I - N3-00001-5P, Construct Vehicle Maintenance Facility Rowe Training Facility, Camp MacKall, NC
8.03 ESTIMATING RUNOFF into the South -Channel
Rational Method
Q = CIA
Given:
Drainage area: ................................................................. 0.787 acres
Parking lot & driveway; asphalt: ..................................... 0.615 acres
Roof:................................................................................0.031 acres
Ramp, concrete: ............................................................... 0.017 acres
Bare packed soil: ............................................................. 0. 124 acres
Max slope length: ............................................................... 320.00 ft
Average slope: .............................................. 0.25%, smooth surface
Location: .................. Camp MacKall, NC (35.04840N, 79.49041 W)
Find:
Peak runoff rate from 25-yr frequency storm, Q25
Solution:
(6) Drainage area: 0.787 acres (given)
(7) Determine runoff coefficient, C.
Calculate Weighted Average
Land Use
Area
Parking lot & driveway, asphalt
0.615
Roof
0.031
Ramp, concrete
0.017
Bare packed soil
0.124
0.787
C = 0.584/0.787 = 0.742
C from Table 8.03a
x 0.825
= 0.507
X 0.800
= 0.025
x 0.875
= 0.015
x 0.300
= 0.037
0.584
(8) Find the time of concentration using interactions of the kinematic wave equation (Table 8.03a) using a
maximum length of travel = 320.00 fit and an average watershed slope of 0.25%. Assume overland flow on
smooth surface.
Tc = 5 minutes.
(9) Determine the rainfall intensity factor, I.
i25 = using 25-year storm, 5 minute duration = 8.89 inches/hr*
(*Source: "Precipitation -Frequency Atlas of the United Slates" NOAA Atlas 14, Volume 2, Version 2)
(10) Q = CIA
Q25 = 0.742(8.89)(0.787) = 5.194 cfs; Use 6 cfs

Guth -Channel
Rational Method, Q=CIA
Find:
Peak runoff rate from 25-year frequency storm, Q25
Calculate Weighted Average
Land Use
Acres
from
Table
8.03b
Calculate
Weighted
Average
Parking lot & driveway, asphalt
0.615
0.825
0.507
Roof
0.031
0,800
0.025
Ramp, concrete
0.017
0.875
0.015
Bare packed soil
0.124
0.300
0,037
0.000
0,000
0.000
0.000
0.000
0,000
0.000
0.000
0.584
Drainage area in acres, A = -787 C = 0:742
la Meg.. 4 NM
Kinematic Wave Theory
Tc = (L/(a'
Length of overland flow, L =M3?00
feetManning's
roughness, n =20
(n from Table below)
Average watershed slope, S =03
foot per foot
Constant alpha, o =
3.725
Constant, m =
1.667
Rational Coefficient, C =
0.742
Trial Time
of Duration
T, (minutes)
- ear
Rainfall
Intensity
I; (inches/hour)
Rainfall
Excess
la (feet/second)
Calculated
Time of
Concentration
T, (minutes)
Use Rainfall
Intensity of
I = (inches/hour)
Iti�NI AAtt5li4M411*
8.89
0.000152771
8.10
8.89
i➢MiR loid fN
7.09
0.000121839
8.87 i
n/a
112111111615U N
5.99
0.000102936
9.49 '
n/a
=111111111N30Hlli1
4.44
7.62998E-05
%70 i
n/a
t1J111160fi t'
2.95
5.06947E-05
12.60
n/a
N1 M120MR
1.80
3.09323E-05
15.35
n/a
NIM.180012
1.30
2.234E-05
17.48,
1MWNi'360HL9iYS
0.78
1.3404E-05
-; ,.. 21.45
n/a
f�1A7209.
0.47
8.07678E-06
26.26
n/a
- ' 1-440111111111
0.27 1
4.63985E-06
32.78
n/a
.',Ain �% 1�` )PAfi`.:
Rainfall Intensity, I = 8.89
m. w� '::i 1TN".' 11iS
Q =
CIA
Runoff coefficient, C =
0.742
Rainfall Intensity, I =
8.890
Drainage area in acres, A =
0,787
Q = L 5 194f cfs
UseF--6-jcfs

M3-00001-SP, Construct Vehicle Maintenance Facility Rowe Training Facility, Camp MacKall, NC
8.05 DESIGN OF STABLE CHANNELS AND DIVERSIONS (South -Channel)
Design of a grass -lined channel - Permissible Velocity
Given:
Design Q25 = 6 cfs
Proposed channel grade = 0.25%
Proposed vegetation: Bermudagrass
Soil: WcB - Wakulla and Candor, 0 to 8 percent slopes (K = 0.11; NP; Sand)
Permissible velocity, VP = 5.0 ft/s (Table 8.05a)
Retardance class: "B" uncut, "D" cut (Table 8.05c)
V-Shape channel dimensions: Designing for low retardance condition (retardance class D); Design to meet VP
Find:
Channel dimensions
Solution:
Make an initial estimate of channel size: A = QN; 6 cfs/5.0 ft/sec = 1.2 ft'
Depth (d) = 1 ft,
Top width (T) = 12 ft
Slope (Z) = e/d = 6/1 = 6
Cross -Sectional Area (A) = Zd2 = 6* 12 = 6 ft'
Hydraulic Radius (R) = Zd / 24Z2 + 1 = 6* 1 / 24(62 + 1) = 6 / 2437 = 6 / 2*2.646 = 6 / 5.292 = 1.13
An iterative solution using Figure 8.05a to relate flow depth to Manning's n proceeds as follows: Manning's
equation is used to check velocities (VR = 5.0 x 1.13 = 5.65) *From Fig. 8.05c
Retardance Class "D" cut
d (ft) A (R2) R (ft)
* n
V (fps)
Q (cfs)
Comments
1.0 6.0 1.13
0.035
2.30
13.80
V<VP:OK
Q>Q25: OK
V = 1.49/n * Rv' * 5112= 1.49/0.035 * 1.13v' *
0.0025112
= 42.57* 1.08* 0.05 = 2.30
fps
Q = AV = 6 * 2.30 = 13.80 cfs
Retardance Class"B" uncut
d (ft) A (ft') R (ft)
* n
V (fps)
Q (cfs)
Comments
1.0 6.0 1.13
0.058
1.38
8.28
V<VP:OK
Q>Q25: OK
V = 1.49/n * RL3 * 5112= 1.49/0.058 * 0.48v' *
0.0025112
= 25.69 * 1.08 * 0.05 = 1.38 fps
Q = AV = 6 * 1.38 = 8.28 cfs
Channel summary:
V-Shape: d = 1.0 ft, e = 6 ft, T = 12 ft, Z = 6:1, grade = 0.25%

J M3-00001-5P, Construct Vehicle Maintenance
Rowe Training Facility, Camp Macxall, NC
8.03 ESTIMATING RUNOFF (Half of the Asphalt Parking Lot)
Rational Method
Q = CiA
Given:
Drainage area: .................................................................
0.661 acres
Parking lot; asphalt: .........................................................
0.613 acres
Roof:................. :..............................................................
0.031 acres
Ramp; concrete: ..............................................................
0.017 acres
Max slopelength: ...............................................................
320.00 fit
Average slope: ..............................................
0.25%, smooth surface
Location: ................. Camp MacKall, NC (35.04840N, 79.49041 W)
Find:
Peak runoff rate from 25-yr frequency storm, Q25
Solution:
(11)Drainage area: 0.661 acres (given)
(12) Determine runoff coefficient, C.
Calculate Weighted Average
Land Use
Area
C from Table 8.03a
Parking lot, asphalt
0.613 x
0.825 = 0.506
Roof
0.031 x
0.800 = 0.025
Ramp, concrete
0.017 x
0.875 = 0.015
0.661
0.545
C = 0.545/0.661 = 0.825
(13)Find the time of concentration using interactions of the kinematic wave equation (Table 8.03a) using a
maximum length of travel = 320 ft and an average watershed slope of 0.25%. Assume overland flow on
smooth surface.
Tc = 5 minutes.
(14)Determine the rainfall intensity factor, i.
izs = using 25-year storm, 5 minute duration = 8.89 inches/lrr"
('Source: 'Precipitation -Frequency Atlas or the United States" NOAA Atlas 14, Volume 2, Version 2)
(15)Q = CiA
Q25 = 0.825(8.89)(0.661) = 4.849 cfs; Use 5 cfs

of Parking Lot
Rational Method, Q=CIA
Find:
Peak runoff rate from 25-year frequency storm, Q25
Calculate Weighted Avemae
Land Use
Acres
from
Table
8.03b
Calculate
Weighted
Average
Parking lot, asphalt -
0.613
0.825
0.506
Roof
0.031
0.800
0.025
Ramp, concrete
0.017
0.875
;
0.015
0.000
k
0.000
0.000
0.000
0.000
•
0.000
0.060
•f
0.000
0.545
Drainage area in acres, A = F-0-66-11 C = 0.825
Kinematic Wave Theory
Tc = (L/(a'
Length of overland flow, L =N3?feetManning's
roughness, n =(n
(rom Table below)
Average watershed slope, S =foot
per foot
Constant alpha, a =
6.773
Constant, m =
1.667
Rational Coefficient, C =
0.825
n
Rainfall Intensity, I = F8.89
Trial Time
of Duration
T, (minutes)
Zb-a
Rainfall,,,: '-'
Intensity ;,
li (inches/hour)
Rainfall
Excess
la (feeVsewnd)
acuae
Time of
Concentration
T, (minutes)
Use Rainfall
Intensity of
I = (Inches/hour)
8$ff.}tfM519illb
`' 8.89
0.000169798
5.43
8.89
'fktY�if107 ^+
7.09 �
0.000135418
': 5.94 ; :.±'
We
. ff'G 7111115109U 4
5.99`
0,000114408
' 6135
n/a
ip F!11, 30M
4.44
8.48033E-05
r r. 7.16 "••
n/a
flA,V601%!9l
2.95
5.63446E-05
:. ':; 8.44' ..
n/a
f86T115120Mi4rf#
1:80
3.43797E-05
10:28 n•'.
n/a
1311tlf�180. •4
:1.30
"'.
2.48298E-05
: 11.71 ' :
n/a
• 360.{ifft
0.78, , �
1.48979E-05
' �i 14:36 %�,::
n/a
dfl'"113k' Z20r>I�
0.47
8.97693E-06
17.59
n/a
9440911ff
0.27
5.15696E-06
,,: 21.95'; «',
n/a
Step 5. Determine peakldischarge, Q F � .,
Q =
CIA
Runoff coefficient, C =
0.825
Rainfall Intensity, I =
8.890
Drainage area in acres, A =
0.661
Q = -"d18491 cfs
Use=cfs

' " Rowe Training Facility, Camp MacKall, NC M3-00001-5P, Construct Vehicle Maintenance Facility
4.0 BIORETENTION AREA SIZING COMPUTATION*
Bioretention Area `A':
BIORETENTION AREA SIZING COMPUTATION
Development
Area C Factor
C x Area
Street, asphalt
5,611 SF x 0.825
= 4,629.075 SF
Grass buffer
2,509 SF x 0.075
= 188.175 SF
TOTALS
8,120 SF
4,817.250 SF
BIORETENTION AREA SIZE
(1) With sand bed (5% sum of C x Area).
= 0.05 x 4,817.25 = 240.863 or say 250 SF
(2) Without sand bed (7% sum of C x Area).
= 0.07 x 4,817.25 = 337.208 or say 350 SF
Bioretention Area `B' & 'Cl:
BIORETENTION AREA
SIZING COMPUTATION
Development
Area
C Factor
C x Area
Parking lot, asphalt
26,730 SF
x 0.825 =
22,052.25 SF
Roof
1,350 SF
x 0.800 =
1,080.00 SF
Ramp, concrete
750 SF
x 0.875 =
656.25 SF
TOTALS
28,800 SF
23,788.50 SF
BIORETENTION AREA SIZE
(3) With sand bed (5% sum of C x Area).
= 0.05 x 23,788.50 = 1,189.425 or say 1,200 SF
(4) Without sand bed (7% sum of C x Area).
= 0.07 x 23,788.50 = 1,665.195 or say 1,700 SF
Bioretention area summary:
Designed size of Bioretention Area `A' = 1,806.29 SF (O.K.)
Designed size of Bioretention Area `B' = 3,196.00 SF (O.K.)
Designed size of Bioretention Area `C' = 3,196.00 SF (O.K.)
*Source: Stormwater Best Management Practices (NCDENR) April 1999

Precipitation Frequency Data Server
Pagel of 4
Precipitation Intensity Estimates (in/hr)
A121*
(years)
❑5
mm
10
mm
15
min
30
mm
60
mm
120 j
❑3
r❑r
hhh
6
12
r
24
hr
48❑4
hr
day
7
ay
❑d
]0
day
20
day
30
da}'
45
day
60
day
=1
5.26
4.20
3.50
2.40
1.50
0.88
0.62
0.37
0.22
0.13
0.07
0.04
0.03
0.02
0.01
0.01
0.01
0.01
�2
6.22
4.97
4.16
2.88
1.80
1.06
0.75
0.45
0.26
0.15
0.09
0.05
0.03
0.03
0.02
0.01
0.01
0.01
=5
7.24
5.80
4.89
3.47
2.23
1.33
0.94
0.56
0.33
0.20
0.11
0.06
0.04
0.03
0.02
0.02
0.01
0.01
10
7.99
6.40
5.39
3.91
2.54
L53
1.09
0.65
0.39
0.23
0.13
FoO 71
0.05
0.04
0.02
0.02
0.02
0.01
25
878 97
7.09
Efl
4.44
2.95
EK
Efl
0.78
0.47
0.27
0.16
0.09
Efl
0.04
0.03
0.02
0.02
0.01
50
9.54
7.59
6.41
4.83
3.27
2.01
1.47
0.89
0.53
0.31
0.18
0.10
0.06
0.05
0.03
0.02
0.02
0.02
100
10.14
8.06
6.79
5.20
3.58
2.23
1.64
0.99
0.60
0.34
0.20
0.11
0.07
0.05
0.03
0.03
0.02
0.02
200
10.70
8.48
7.13
5.55
3.89
2.44
1.82
1.11
0.68
0.38
0.22
0.12
0.07
0.06
0.04
0.03
0.02
0.02
500
11.39
9.01
7.56
6.01
4.31
2.73
2.08
1.27
0.78
0.44
0.25
0.13
0.08
0.06
0.04
0.03
0.02
0.02
1000
11.92
9.38
7.85
6.36
4.64
2.96
2.28
1.40
0.87
0.48
0.27
0.15
0.09
0.07
0.04
0.03
0.02
0.02
Text Version of table These precipitation frequency estimates are based on a oarbal duration series. ARI is the Average Recurrence Interval.
- - ' Please refer to the documenlidon for more information. NOTE: Formatting forces estimates near zero to appear as zero.
POINT PRECIPITATION
FREQUENCY ESTIMATES
FROM NOAA ATLAS 14
North Carolina 35.04840 N 79.49041 W 298feet
from "Precipitation -frequency Atlas of the United States" NOAA Atlas 14, Volume 2, Version 3
G.M. Bonin, D. Martin, B. Lin, T. Parzybok, M.Yekta, and D. Riley
NOAA, National Weather Service, Silver Spring Maryland, 2004
Extracted: Mon Oct 30 2006
Confidence, Limits Seasonality ,. ,, ,LoCation,Maps Other Info., GIS data Maps H611 JEP
http://hdsc.nws.noaa. gov/cgi-binlhdscibuildout.perl?type=idf&series�d&units=us&state... 10/30/2006

Precipitation Frequency Data Server
Page 2 of 4
19
7
3
L 2
•n 1
a 0.7
0.3
w 0.3
y 0.2
ti .1
.07
t .05
.03
.02
o .01
U
N
i
a
001
Partial duration based Point IDF Curves Version: 3
35.04840 N 79.49041 y 298 ft
--------------------
�MEN
ps
iiiiiiiiiiiiii
-----------
�OMM■■■■■■EM
W
7110"
MEN
6 m Lb 6 6 C6 W -' rN m y oo a v� r: m u= m m N m
M W ON Duration W M v W
Mon Oct 30 07:40:22 2006
Average Recurrence Interval
<years)
1-year 5u-year -+-
2-year 100-year
5-year -t- 200-year --�
10-year -a 500-year �-
25-year -K- 1000-year -�
Confidence Limits -
* Upper bound of the 90% confidence interval
Precipitation Intensity Estimates (in/hr)
ARI** 5 10 15 30 60 120 3 6 12 24 48 4 7 10 20 30 45 60
(years) min min min min min min hr hr hr hr hr day day day day day day day
=
5.80
4.63
3.86
2.64
1.65
0.97
0.69
0.41
0.24
0.14
0.08
0.04
0.03
0.02
0.02
0.01
0.01
0.01
0
6.85
5.48
4.59
3.17
1.99
1.18
0.83
0.49
0.29
0.17
O.I O
0.05
0.04
0.03
0.02
0.02
0.01
0.01
�5
7.97
6.3 8
5
.83.38 3
2.45
1.47
1.05
0.62
0.37
0.21
0.12
0.07
0.04
0.03
OF021
0.02
0.01
0.01
10
8.78
7.03
5.92
4.29
2.79
1.70
1.21
0.72
0.43
0.25
0.14
0.08
0.05
0.04
0.02
0.02
0.02
0.01
25
9.76.
7.77
6.57
4.86
3.24
2.00
1.44
0.86
0.52
0.29
0.17
0.09
0.06
0.04
0.03
0.02
0.02
0.02
50
10.45
8.32
7.02
5.29
3.58
2.23
1.63
0.98
0.59
0.33
0.19
0.10
0.06
0.05
0.03
0.02
0.02
0.02
100
11.11
8.83
7.44
5.69
3.92
2.46
1.82
1.09
0.66
0.37
0.21
0.11
0.07
0.05
0.03
0.03
0.02
0.02
200
11.72
12.48
9.29
9.87
7.82
8.28
6.08
6.59
4.27
4.73
2.70
2.01
1.22
0.74
0.41
0.23
0.13
0.08
0.06
0.04
0.03
0.02
0.02
500
3.02
2.29
1.39
0.86
0.47
0.27
0.14
O 09
0.07
0.04
0.03
0.02
0.02
1000
13.07
10.29
8.61
6.97
5.09
3.28
2.52
1.53
0.95
0.52
0.29
0.16
0.10
0.07
0.04
0.03
0.03
0.02
' The upper bound of the
confidence interval at 90
%confidence level is the value
which 5 %of the simulated
ouantile
values
for a niven
frem iPnry
are nraatar
man
-These precipitation frequency estimates are based on a partial duration series ARI is the Average Recurrence Interval,
Please refer to the _d9gumuntabon for more information. NOTE: Formatting prevents estimates near zero to appear as zero.
http://hdse.nws. noaa.gov/cgi-binlhdse/bui ldout.perl?type=idf&series=pd&units=us&state... 10/30/2006

Precipitation Frequency Data Server
Page 3 of 4
* Lower bound of the 90% confidence interval
Precipitation Intensity Estimates (in/hr)
ARI** (years) a]01530 203� 0�ra�45 60
mm hr day day daymm mm mmin hhr hr day Ildaylldaylldayl
4.80
3.83
3.20
2.19
1.36
0.79
0.56
0.34
0.20
0.12
0.07
0.04
0.03
0.02
0.01
0.01
0.E1
0.01
5.66
4.54
3.80
2.62
].65
0.96
0.68
0.41
0.24
0.14
0.08
0.05
O.E3
0.02
0.02
0.01
0.01
0.01
6.59
5.27
4.45
3.16
2.03
1.20
0.85
0.51
0.30
0.18
0.10
0.06
0.04
0.03
070210.02
0.01
0.01
10
7.26
5.81
4.90
3.55
2.31
1.39
0.99
0.59
0.35
0.21
0.12
0.07
0.04
0.03
0.02
0.02
0.01
0.01
25
8.04
6.41
5.42
4.01
2.67
1.62
1.17
0.70
0.42
0.25
0.14
0.08
0.05
0.04
0.03
0.02
0.02
0.01
50
8.60
6.85
5.78
4.35
2.95
1.80
1.31
0.79
0.47
0.28
0.16
0.09
0.06
0.04
0.03
0.02
0.02
0.02
100
9.10
7.22
6.09
4.66
3.21
1.98
1.46
0.88
0.53
0.31
0.18
0.10
0.06
0.05
0.03
0.02
0.02
0.02
200
9.55
7.57
6.37
4.96
3.48
2.16
1.60
0.97
0.59
0.35
0.20
0.11
0.07
0.05
0.03
0.03
0.02
0.02
500
]0.07
7.96
6.68
5.32
3.81
2.39
1.80
1.1E
0.67
0.39
0.22
0.12
0.08
0.06
0.04
0.03
0.02
0.02
1000
10.45
8.23
6.89
5.58
4.07
2.57
1.96
1.20
0.73
0.43
0.24
0.13
0.08
0.06
0.04
0.03
0.02
0.02
' The lower bound of the confidence interval at 90 %confidence level is the value which 5%of the simulated ouande
values
for a given freauencv, are less than.
"These precipitation frequency estimates are based on a partial duration maxima sedes. ARI is the Average Recurrence Interval.
Please refer to the documentation for more information. NOTE: Formatting prevents estimates near zero to appear as zero.
Maps -
These maps were produced using a direct map request from the
U.S. Census Bureau Mapping�ntl Qaqographic Resources
Tiger Ma So erver.
Please read disclaimerfor more information.
http://hdse.nws.noaa. gov/cgi-binlhdscibuildout.perl?type=id f&series=pd&units=us&state... 10/30/2006

,Precipitation Frequency Data Server
.r
Page 4 of 4
LEGEND
— State
— Connector
— County
® Stream
= Indian Resv
EM Military Area
® Lake/Pend/Ocean
IM National Park
— Street
0 Other Park
— Expressway
0 City
— Highway 0
Cqunty6 8 mi
Scale 1:220583
p 11
8resol ution
*average --true scale depends
on monitor
Other Maps/Photographs -
View USGS digital orthophoto quadrangle D( OQ) covering this location from TerraServer; USGS Aerial Photograph
may also be available
from this site. A DOQ is a computer -generated image of an aerial photograph in which image displacement caused by terrain
relief and camera tilts has been removed. It combines the image characteristics of a photograph with the geometric qualities
of a map. Visit the USGS for more information.
Watershed/Stream Flow Information -
Find the Watershed for this location using the U.S. Environmental Protection Agency's site.
Climate Data Sources -
Precipitation frequency results are based on data f •om a variety of sources, but largely NCDC. The following links provide
general information
about observing sites in the area, regardless of if their data was used in this study. For detailed information about the
stations used in this study,
please refer to our documentation.
Using the National Climatic Data Center's (NCDC) station search engine, locate other climate stations within:
+(-30 minutes j ...OR. +l-1 dggree: il. of this location (35.04840/-79.49041). Digital ASCII data can be
obtained directly from NCDC.
Hydrometeorological Design Studies Center
DOCtNOAA/Nanonal Weather Service
1325 East-West Highway
Silver Spring, MD 20910
[phone]
Questions?: 111�0 uestiunsnnoaa.gov
Disclaimer
http://hdsc. nws. noaa. gov/cgi-binlhdsclbuildout.perl?type=id,f&series=pd&units=us&state... 10/30/2006