SW5100601_CURRENT PERMIT_20100607

STORMWATER DIVISION CODING SHEET
POST -CONSTRUCTION PERMITS
PERMIT NO.
SWSIl�O�j/
DOC TYPE
� CURRENT PERMIT
❑ APPROVED PLANS
❑ HISTORICAL FILE
DOC DATE
YYYYMMDD
I

14
sa..=
NCDENR
North Carolina Department of Environment and Natural Resources
Beverly Eaves Perdue
Governor
Division of Water Quality
Coleen H. Sullins
Director
June 3, 2010
Mr. Charlie Horne, County Manager
Chatham County
P.O. Box 608
Pittsboro, North Carolina 27312
Subject: Stormwater Permit No. SW5100601
North District Park.
High Density Project
Chatham County
Dear Mr. Horne:
Dee Freeman
Secretary
The Stormwater Permitting Unit received a complete Stormwater Management Permit Application for the North
District Park project on June 2, 2010.. Staff review of the plans and specifications has determined that the project,
as proposed, will comply with the Stormwater Regulations set forth in Title,l 5A NCAC 2H.1000 and Session Law.
2006-246. We are forwarding Permit No. SW5100601, dated June 3, 2010, for the construction, operation and
maintenance of the subject project and the stormwater BMPs.
This permit shall be effective from.the date of issuance until June 2, 2020, 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 inspection and maintenance of the
stormwater management system will result in future compliance problems.
If any parts, requirements, or limitations contained in this permit are unacceptable, you have the right to
request an adjudicatory hearing upon written request within thirty (30) days following receipt of this permit.
This request must be in the form of a written petition, conforming to Chapter 150B of the North Carolina
General Statutes, and filed with the -Office of Administrative Hearings, P.O. Drawer 27447, Raleigh, NC
27611-7447. Unless such demands are made this permit shall be final and binding.
This project will be kept on file at the Raleigh Regional Office. If you have any questions, or need additional
information concerning this matter, please contact Mike Randall at [phone]; or
[e-mail].
ncdenr.gov.
Sincerely,
for Coleen H. Sullins
cc: R. Todd Fisher, PE, ColeJenest & Stone
Raleigh Regional Office
Central Files
SPU Files
Wetlands and Stormwater Bran& One
1617 Mail Service Center, Raleigh, North Carolina 27699.1617 NorthCarolina
Location: 512 N, Salisbury St. Raleigh, North Carolina 27604 ���������
Phone: [phone] FAX: [phone] Customer Service: 1-877-623.6748
Internet: www.ncwalerquality.org
An Equal Opportunity 1 Affirmative Action Employer

State Stormwater Permit
Permit No. SW5100601
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 "43, General Statutes of
North Carolina as amended, and other applicable Laws, R.,a':es, and Regulations
PERMISSION IS HEREBY GRANTED TO
Chatham County - North District Park
at Big Woods Road in Chapel Hill
Chatham County
FOR THE
construction, operation and maintenance of one bioreiention cell(s) and one dry
extended basin in compliance with the provisions of Session Law 2006-246 and 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 June 2, 2010, and shall be
subject to the following specified conditions and limitations:
I. DESIGN STANDARDS
1. This permit is effective only with respect to the nature and volume of stormwater
described in the application and other supporting data.
2. This stormwater system has been approved for the management of stormwater
runoff as described in this permit and supporting documents. The stormwater
control has been designed to handle the runoff from 90,169 square feet of
impervious area.
3. The tract will be limited to the amount of built -upon area as indicated in this
permit, and per the application documents and as shown on the approved plans.
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.
6. The built -upon areas associated with this project shall be located at least 30 feet
landward.of all perennial and intermittent surface waters.
Page 1 of 4

State Stormwater Permit
Permit No. SW5100601
7. The design criteria as provided on the attached supplement forms must be
maintained at design condition.
II. SCHEDULE OF COMPLIANCE
1. 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 bz•repaired immediately.
3. The permittee shall �J' all time provide the operation and maintenance necessary
to assure the permitted stormwater system functions at optimum efficiency. The
approved Operat-.n 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 re -vegetation of slopes and the filter strip.
d. Immediate repair of eroded areas.
e. Maintenance of all slopes in accordance with approved plans.
f. Debris removal and unclogging of all drainage structures, level spreader,
filter media, planting media, underdrains, catch basins and piping.
g. Access to'the cell acid outlet structure must be availah.le at all times.
4. Records of maintenance activities must'be kept for each_pe,mitted BMP. The
reports will indicate the date, activity, name of person performing the work and
what actions were taken.
5. The permittee shaii submit to the Division of Water Quality an annual summary
report. of. the maintc.-nance and inspection records for each BMP. The report
shall summarize the inspection dates, results of the inspections, and the
maintenance work performed at each inspection.
6. The facilities shall be constructed as shown on the approved plans. This permit
shall become void unless the facilities are constructed in accordance with the
conditions of this permit, the approved plans and specifications, and other
supporting data.
7. 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. Access to the stormwater facilities shall be maintained via appropriate recorded
easements at all times.
Page 2 of 4

State Stormwater Permit
Permit No. SW5100601
10. The permittee 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:
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 hLJlt-upon area or to the
drainage area.
e. Further subdivision, acquisition, lease or sale of al! 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 appj oval or a CAMA
Major permit was sought.
f. Filling in, altering, or piping of any vegetative conv� -;.,ance shown on the
approved plan.
11. The permittee shall submit final site layout and grading plans for any permitted
future areas shown on the approved plans, prior to construction.
12. 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.
13. The Director may notify the permittee when the permitted site does not meet one
or more of the minimum requirements of the permit. Within.the time frame
specified in the -notice, the permittee-shall submit a written time schedule.to the
Director for modifying the site to meet minimum requirements. The permittee
shall provide copies of revised plans and certification in writing'to the Director
that the changes have been made.
III. GENERAL CONDITIONS
1. 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 completed Name/Ownership Change form signed by both parties, to the
Division of Water Quality, accompanied by the supporting documentation as
listed on page 2 of the form. 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 permit conditions until such'
time as the Division approves a request to transfer the permit.
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) having 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 permittee grants DEN Staff permission to enter the property during normal
business hours for the purpose of inspecting all components of the permitted
stormwater management facility.
Page 3 of 4

State Stormwater Permit
Permit No. SW5100601
7. The permit issued shall continue in force and. effect until revoked or terminated.
The permit -may be modified, revoked and reissued or terminated for cause. The
filing of a request for a permit modification, revocation and re -issuance or
termination does not stay any permit condition.
8. 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.
9. Approved plans and specifications for this project are incorporated by reference
and are enforceable parts of the permit.
10. The issuance of this permit does not prohibit the Director from reopening and
modifying the permit, revoking and reissuing the, permit, or terminating the permit
as allowed by the laws, rules and regulations contained in Sessir,n Law 2006-
246, Title 15A NCAC 2H.1000, and NCGS 143-215.1 et.al.
11. The permittee shall notify the Division in writing of any name, ownership or
mailing address changes at least 30 days prior to making such changes.
12. The permittee shall submit a renewal request with all required forms and
documentation at least 180 days,prior to the expiration date of this permit.
Permit issued this the 3rd day of June, 2010.
NORTH CAROLINA ENVIRONMENTAL -MANAGEMENT COMMISSION
for Coleen H. Sullins, Director
Division of Water Quality
By Authority of the Environmental Management Commission
Page 4 of.4

State Stormwater Permit
Permit No. SW5100601
Chatham County. - North District Park
Stormwater Permit No. SW5100601
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,
Chatham County.- North District Park
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 b6 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:
Signature
Registration Number
Date
SEAL
Page 1 of 2

State Stormwater Permit
Permit No. SW5100601
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.
'. All the built -upon area associated with the project is graded such that the
' runoff drains to the system: -:
4. --,.All roof drains are located such that the runoff is directed.into the system.
The outlet/bypass structure elevations are per the approved plan.
6. The outlet structure is located per the approved plans.
7. Trash rack. Is provided on the outlet/bypass structure.
8.1 All slopes are grassed with permanent vegetation, per the vegetation plan.
9. Vegetated slopes are no steeper than 3:1.
A0. --.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.
15. The required system dimensions are provided per the approved plans.
cc: NCDENR-DWQ Regional Office
Page 2 of 2

Permit
EWA
NCDENR
MIAIR'UpAlr.
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATION APPLICATION FORM
DRY EXTENDED DETENTION BASIN SUPPLEMENT
(to be provided by DWQ)
o�oF warFRQc
� r
This form must be filled out, printed and submitted.
The Required Items Checklist (Part 111) must be printed, filled out and submitted along with all the required information.
7 .;f
"
Project name
Contact person
Phone number-
Date
Drainage area number.
NtEyhic;tsat(t,`��, =Az
-[dtldFlsher�'�i
W1$W=�r
Site Characteristics
Drainage area
17 t333;00- ftz
Impervious area
e
% Impervious
0,52
Design rainfall depths
in
Peak Flow Calculations
1-yr, 24-hr rainfall depth
'06 in
Rational C, pre development
"k!E1E4D (unitfess)
Rational C, post -development
,-•,4 %Q (unitless)
Rainfall intensity: 1-yr, 24-hr storm
0050X inlhr
Pre -development 1-yr, 24-hr peak flow
ft3/sec
Post -development 1-yr, 24-hr peak flow_272
ft315ec
Pre/Post 1-yr, 24-hr peak control
-0.79 ft3lsec
Storage Volume: Non -SA Waters
Minimum required volume
"y, 5522 83 ft3
Provided volume
rt6749:(f{F' ' ft3
OK
Sediment storage volume provided
f3;591?00 ft3
OK
Storage Volume: SA Waters
1.5" runoff volume
N ft3
Pre -development 1-yr, 24-hr runoff volumed
ft3
Post -development 1-yr, 24-hr runoff volume
ft3
Minimum required volume
ft3
Provided volume
Sediment storage volume provided.
Basin Design Parameters
Drawdown time
days
OK
SHWT elevation
'fmsl
Basin bottom elevation
`�fmsl
OK
Storage elevation
�fmsl
Z
Basin side slopes:1
OK
Top elevation
fmsl
OK
Freeboard provided1UQ,�
It
OK
Basin Bottom Dimensions
Basin length
93:001 ft
Basin width
33t?0 ft
Length to width ratio
2;80 A
OK
Appra-v&d Str,"nwntmr 'E rliii"t f3orrmmertt-�s
Construction in xcard..nce w4h St3ase ,Jocurnents is
required by the stonnwaler Perin !. NorYi Caro?ina
rules require That the systam designer
Inspect dufing czinstructicn: _etti�l conformity with the
plans and specs; and certi y er2mpiki +ce with the
stormwater rules. (15A NI C:AC 2t-i .1008 (j) )
Per it 4 .1A./�`/oG G O /_ gate G13 Lot a
by 2 .e,� _ NC Division of Water Quality
Sheet #_/Qf Z Revision Date_ 4lizp�Q
W
Form SW401-Dry Extended Detention Basin-Rev.3 Parts I. & II, Design Summary, Page 1 of 2

Permit No.
(to be provided by DWQ}
Additional Information
Total runoff volume captured by basin
_ ,.$17; ac-in
Forebay is not required
Forebay provided`
'N;i (Y or N)
Is basin in a retarded drainage easement?
, ` 'f� (Y or N)
OK
Does basin capture all runoff at ultimate build -out?
'{;� , : (Y or N)
OK
Is a sediment depth indicator included?
y (Y or N)
OK
Does the basin include a drain?
M`Y (Y or N)
OK
Approvead Stormwater Fle,r :it Documents
Construction in accordance mth there documents is
required by the stormwa'er permit. No;,h Carolina
rules require ,hat the stormw_Mer system designer
Inspect during construction: ce tiff conformity with the
plans and specs; and cerlify compliance with the
stormwater rules. (15A NCAC 2H .1008
Cate
by /mil NC Division of Water Quality
Sheet #—,2—OL7 Revision Date 4 z . U
Form SW401-Dry Extended Detention Basin-Rev.3 Parts I. a II. Design Summary, Page 2 of 2

Permit No.
(to be provided by DWQ)
Please indicate the page or plan sheet numbers where the supporting documentation can be found. An incomplete submittal package will
result in a request for additional information. This will delay final review and approval of the project. Initial in the space provided to
indicate the following design requirements have been met. If the applicant has designated an agent, the agent may initial below. If a
requirement has not been met, attach justification.
Pagel Plan
Initials
Sheet No.
CVI.I
1. Plans (1" - 50' or larger) of the entire site showing:
- Design at ultimate build -out,
- Off -site drainage (if applicable),
- Delineated drainage basins (include Rational C coefficient per basin),
- Basin dimensions,
- Pretreatment system,
- Maintenance access,
- Proposed drainage easement and public right of way (ROW),
- Overflow device, and
- Boundaries of drainage easement.
2. Plan details (1" = 30' or larger) for the bioretention cell showing:
- Basin dimensions
Approved Stoemwptes Permit Dui�,ue:tents
- Pretreatment system, Construction in accordance with these documents is
- Maintenance access, required by the stomiwater lrenrlil. No. Carolina _
- Outlet structure, rules require that the starrnwateFBI systern designer
Inspect during construction; aver, f conformity with the
- Overflow device, plans and specs; and certify cor--rpliance with the
- Flow distribution detail for basin inflow, and stormwater rules. (15A NCA(. 2t-- .1008 (j) )
Permit #.SlcXES76660I Date_Qr/Zia/o
_
- Vegetation specifications.
by_e�77 e " NC Division of Wate Quality
GV 1.1
3. Section view of the basin (1" = 20' or larger) showing: Sheet # _/ _Revision Date (?/Q
Side slopes, 3:1 or lower,
Pretreatment and treatment areas, and
- Inlet and outlet structures.
Gy
6. A construction sequence that shows how the dry detention basin will be protected from sediment until the
entire drainage area is stabilized.
7. The supporting calculations.
YOr t)CW DAD
8. A copy of the signed and notarized operation and maintenance (0&M) agreement.
9. A copy of the deed restrictions (if required).
1�"Cft�0 10. A soils report that is based upon an actual field investigation, soil borings, and infiltration tests. County
soil maps are not an acceptable source of soils information.
Form SW401-Dry Extended Detention Basin-Rev.3 Part Ill. Required Items Checklist, Page i of 1

Permit Number:
(to be provided by DWQ)
®NEI-
� o�oF warF9oc
NCDENR T
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATION APPLICATION FORM
BIORETENTION CELL SUPPLEMENT
This form must be filled out, printed and submitted.
The Required Items Checklist (Part tit) must be printed, filled out and submitted along with all of the required information.
Project name
Contact name
Phone number
Date
Drainage area number
Site Characteristics
Drainage area
Impervious area
Percent impervious
Design rainfall depth
Peak Flow Calculations
Is pre/post control of. the 1-yr, 24-hr peak flow required?
1-yr, 24-hr runoff depth
1-yr, 24-hr intensity
Pre -development 1-yr, 24-hr peak flow
Post -development 1-yr, 24-hr peak flow
Pre/Post 1-yr, 24-hr peak control
Storage Volume: Non -SA Waters
Minimum volume required
Volume provided
Storage Volume: SA Waters
1.5" runoff volume
Pre -development 1-yr, 24-hr runoff
Post -development 1-yr, 24-hr runoff
Minimum volume required
Volume provided
Cell Dimensions
Podding depth of water
Ponding depth of water
Suo.ace area of the top of the bioretention cell
Length:
Width:
-or- Radius
Media and Soils Summary
Drawdown time, ponded volume
Drawdown time, to 24 inches below surface
Drawdown time, total:
In -situ soil:
Soil permeability
Planting media soil:
Soil permeability
Soil composition
% Sand (by weight)
% Fines (by weight)
% Organic (by weight)
Phosphorus Index (P-Index) of media
Form 5W401-Bioretenbon-Rev.8
Jury 30, 2009
its 'a.32;670 ft2
.�20;� ftz
64.0% %
-.�rX10, inch
(Y or N)
,l in
inihr
ft3lsec
ft3lSeC
ft3isec
Gc2 014'0ft3
ft3
ft3
4 ft3
0 ft3
ft 3
Approved Sionnwater Formii Documents
OK Construction in accordance, wiixi these documents is
required by the stormwater permit. Narlh Carolina
rules require that the stofmwats:r system designer
Inspect during construction: oeriiiy conformity with the
plans and specs; and cerQy cor.!,f lance with the
stormwater rules. (15A t3GAC 2H .1008 (1) )
Per #!%lGD G Or Gaie 670l.0
by NC t7lvision of Water Quality
Sheet #—/d/ Z __Re`rision Date '�1-�ZCr1D
: � p12l inches
OK
1.00 ft
2;014; ft2
OK
"4' . � 96 ft
OK
"�20 ft
OK
iVIA ft
OK
.. g x,�;;"�;� .,l2 hr OK
36!hr OK
48 hr
inihr OK
7Z ;�.,�:1.,00 inlhr OK
pgKg�85% OK
MaUM,12% OK
OK
Total: 100%
t,'?� 20 (unitIass) OK
Parts I and II, Design Summary, Page t or 2

Permit Number:
(to be provided by DWQJ
Basin Elevations
Temporary pool elevation
;,<T290:50;fmsl
Type of bioretention cell (answer "Y" to only one of the two
following questions):
Is this a grassed cell?
.�S? � �N;,. ,r < (Y or N)
Is this a cell with trees/shrubs?
(Y or N) OK media depth
Planting elevation (top of the mulch or grass sod layer)
'._, ; . 289:5'fmsl
Depth of mulch
: "�5�ir4 inches OK
Bottom of the planting media soil
fmsl
Planting media depth
3.67 ft
Depth of washed sand below planting media soil
NMA' 0.33j ft
Are underdrains being installed? I` ="' `Y (Y or N)
How many clean out pipes are being installed?
OK
What factor of safety is used for sizing the underdrains? (See
'' n
� 2 OK
BMP Manual Section 12,3.6)
,;- ,:.., �,. a}
Additional distance between the bottom of the planting media and
1 ft
the bottom of the cell to account for underdrains
Bottom of the cell required
284.5 fmsl
SHWT elevation
E - ,. 'e?3�:.272 fmsl
Distance from bottom to SHWT
12.5 ft OK
Internal Water Storage Zone (IWS)
Does the design include IWS
W7 . _N (Y or N)
Elevation of the top of the upturned elbow'?.
„ r fmsl
Separation of IWS and Surface
289.5 ft
Planting Plan
Number of tree speciest�2;
Number of shrub species
fssm 21
Number of herbaceous groundcovef species'a-�bc``01
OK
Additional Information
Does volume in excess of the design volume bypass the
bioretention cell?
Does volume in excess of the design volume flow evenly distributed
through a vegetated filter?
What is the length of the vegetated filter?
Does the design use a level spreader to evenly distribute flow?
Is the BMP located at least 30 feet from surface waters (50 feet if
SA waters)?
Is the BMP located at least 100 feet from water supply wells?
Are the vegetated side slopes equal to or less than 3.1?
Is the BMP located in a proposed drainage easement with access
to a public Right of Way (ROW)?
Inlet velocity (from treatment system)
Is the area surrounding the cell likely to undergo development in
the future?
Are the slopes draining to the bioretention cell greater than 20%?
Is the drainage area permanently stabilized?
Pretreatment Used
(Indicate Type Used with an "X' in the shaded Ceti)
Gravel and grass
(8 inches gravel followed by 3-5 ft of grass)
Grassed Swale
Forebay
Other
(Y or N) OK
(Y or N) Excess volume must pass through filter.
(Y or N) Show how flow is evenly distributed.
(Y or N)
(Y or N)
(Y or N)
(Y or N)
fllsec
(Y or N)
(Y or N)
OK Approved Starrvlwc%t r t�effnit Documents
Construction in accordance -A; th 1 lose documents. is
OK required by the slormwater aermit. ;.iorth Carolina
OK rules require that the storn7waltlr system designer
Inspect during construction; r rGh, conformity with the
0K plans and specs; and certify c crnpiiance with the
stormwater rules. (1SA NCAC 21-? .1008(p)�,,
Permit # J�GS/S%40(o0r -- Date �L�z?w0
Division of Water Quality
OK Sheet # L of Z Revision Datr►h'1/—/T!>/p
fayl
(Y or N) OK
X2
Form SW401-Bioretention-Rev.8
July 30, 2009 Parts I and II. Design Summary, Page 2 of 2

Permit No:
(to be assigned by D WQ)
III.I,REQU REVFTEMS-CHECKU8TXW. � UNO'
Please indicate the page or plan sheet numbers where the supporting documentation can be found. An incomplete submittal package will
result in a request for additional information. This will delay final review and approval of the project. Initial in the space provided to
indicate the following design requirements have been met If the applicant has designated an agent, the agent may initial below. If a
requirement has not been met, attach justification.
Page! Plan
I 'tiaalls Sheet No.
49 _64a
074
In
1�
Plans (1" - 50' or larger) of the entire site showing:
Design at ultimate build -out,
Off -site drainage (if applicable),
Delineated drainage basins (include Rational C coefficient per basin),
Cell dimensions,
Pretreatment system,
High flow bypass system,
Maintenance access,
Recorded drainage easement and public right of way (ROW),
Clean out pipe locations,
Overflow device, and
Boundaries of drainage easement.
2. Plan details (1" = 30' or larger) for the bioretention cell showing:
Cell dimensions
Approved if3nnwatc;- c%r: cif Doc5ijFnents
Pretreatment system,
Construction in ac;cordar=c�- w:kh !hose documents is
High flow bypass system,
required by the storm -wale, ;:erin t. Noah Carolina
Maintenance access,
rules require that the system designer
Inspect during construclion, 0e-"ty conformity with the
Recorded drainage easement and public right of way (RDM, and specs; and cetifk . ,;: -r;,'r:ance with the
Design at ultimate build -out,
stormwatef rules (15A. NC;:_: 20 .1O06 (j) )
Off -site drainage (if applicable),
Permit if L _�d f — Date La 3 ZD/d
Clean out pipe locations,
by -_ NC Division of Water Quality
Overflow device, and
Sheet # /d�/`' - Revision Date�KI-a-1 pld
Boundaries of drainage easement.
Indicate the P-Index between 10 and 30
3. Section view of the bioretention cell (1" = 20' or larger) showing:
Side slopes, 3:1 or lower
Underdrain system (if applicable), and
Bioretention cell layers (ground level and slope, pre-treatment, pending depth, mulch depth, fill media
depth, washed sand, filter fabric (or choking stone if applicable), #57 stone, underdrains (if applicable),
SHWT level(s), and overflow structure]
AMifPf_Mp 4. A soils report that is based upon an actual field investigation, soil borings, and inMtration tests. The
results of the soils report must be verified in the field by DWO, by completing & submitting the soils
investigation request form. County soil maps are not an acceptable source of soils information. All
elevations shall be in feet mean sea level (fmsl). Results of soils tests of both the planting soil and the in
situ soil must include:
Soil permeability,
Soil composition (% sand, % fines, % organic), and
�f� 1 P-indox.
ILi75, l 5. A detailed planting plan (1" = 20' or larger) prepared by a qualified individual showing:
A variety of suitable species,
Sizes, spacing and locations of plantings,
Total quantity of each type of plant specified,
A planting detail,
The source nursery for the plants, and
Fertilizer and watering requirements to establish vegetation.
CA-2
6 0-
6. An assurance that the installed system will meet design specifications upon initial operation once the
project is complete and the entire drainage area is stabilized.
7. A construction sequence that shows how the bioretention cell will be protected from sediment until the
entire drainage area is stabilized.
)kqKif S. The supporting calculations (including underdrain calculations, if applicable).
"r NfISA'Amp 9. A copy of the signed and notarized inspection and maintenance (18M) agreement.
AM &)(Lt1 C9P 10. A copy of the deed restriction.
Form sW401-Bioretention-Rev.7 Part Ill, Page 1 of 1

DWQ.USE ONLY'_ , . _
Date Received Fee Paid Permit Number
State of North Carolina
Department of Environment and Natural Resources
Division of Water Quality
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
This form may be photocopied for use as an original
1, GENERAL INFORMATION
1. Applicants name (specify the name of the corporation, individual, etc. who owns the project):
Chatham County c/o Charlie Horne, County Manager
2. Print Owner/Signing Official's name and title (person legally responsible for facility and compliance):
Chatham County c/o Charlie Horne, County Manager
3. Mailing•Address for person listed in item 2 above:
City: Pittsboro State: NC Zip:27312
Phone: (919 )_2-d_7_,00 Fax: 1 42- 272
Email: charlie.horne©ciiathamnc.org
4. Project Name (subdivision, facility, or establishment name - should be consistent with project name on plans,
specifications, letters, operation and maintenance agreements, etc.):
Northeast District Park
5. Location of Project (street address):
Big Woods Road _
City:Chapel Hill County:Chatham Zip:27517
6. Directions to project (from nearest major intersection):
[Driving west on Highway 4 turn right onto Big Woods Rd. Continue 5.4 miles on Big Woods Rd. Site i
located on right side of road.
7. Latitude:35° 48' 42" N _ LWgitude:79° 2' 1" W of project
ti
8. Contact person who can answer questions about the project:
Name: R. Todd Fisher, PE Telephone Number: (919 ) 719-1800
Email tfisherOcolejene�tstone.com
II. PERMIT INFORMATION:
1. Specify whether project is (check one): ®New
form SWU-101 Version 09.25.08 1 Page l of
[]Renewal ❑Modif�ic-a-tion-{
S
JUN - 7
lire.. f:L�i. .• �... ..• .. (F

2. If this application is being submitted as the result of a renewal or modification to an existing permit, list the
existing permit number N/A and its issue date (if known) N/A
3. Specify the type of project (check one):
❑Low Density ❑High Density ❑Redevelop ®General Permit ❑Universal SMP ❑Other
4. Additional Project Requirements (check applicable blanks; information on required state permits can be
obtained by contacting the Customer Service Center at 1-877-623-6748):
❑CAMA Major ®Sedimentation/Erosion Control ❑404/401 Permit ❑NPDES Industrial Stormwater
Ill. PROJECT INFORMATION
1. In the space provided below, summarize how stormwater will be treated. Also attach a detailed narrative
(one to two pages) describing stormwater management for the project.
Chatham County is planning to build a park containing a baseball field, multi -purpose field, tennis court and
restroom/concession building. The stormwater will be treated using level spreaders, bioretention, and dry
detention. The BMP chosen to treat the runoff from the entrance drive will be bioretention. As part of a 319
rant, North Carolina State Universities will be installing and monitorinz two level spreaders for research. The
level_ spreaders will treat the runoff from the parking lot and tennis courts. -
2. Stormwater runoff from this project drains to the Ca e Fear River basin.
3. Total Property Area: 66.53 acres 4. Total Coastal Wetlands Area: 0.00 acres
5. Total Property Area (3) — Total Coastal Wetlands Area (4) = Total Project Area**:66.53 acres
6. (Total Impervious Area / Total Project Area) X 100 = Project Built Upon Area (BUA):2.8 %
7. How many drainage areas does the project have?1
8. Complete the following information for each drainage area. If there are more than two drainage areas in the
project, attach an additional sheet with the information for each area provided in the same format as below.
For high density projects, complete the table with one drainage area for each engineered stormwater device.
3Basin'Information
x Drainage Area 1 r
I?ra' gel rea 2
Receiving Stream Name
Stream Class & Index No.
Jurisdictional
Total Drainage Area (sf)
172,933
On -site Drainage Area (sf)
172,933
Off -site Drainage Area (so
0
Existing Impervious* Area (so
0
Proposed Impervious*Area (sf)
90,169
% Impervious* Area (total)
52
;"e:rr
Impervious Surface;Area
-..ate
D a Se eg, a 1
12C50Ma-51
On -site Buildings (so
608
On -site Streets (sf)
On -site Parking (so
51,896
On -site Sidewalks (so
23,265
Other on -site (so
14,400
Off -site (so
Total (sf):
90,169
* Impervious area is defined as the built upon area including, but not limited to, buildings, roads, parking areas,
sidewalks, gravel areas, etc.
Form SWU-101 Version 09.25.08 Page 2 of 4

`Impervious area is defined as the built upon area including, but not Iimited to, buildings, roads, parking areas,
sidewalks, gravel areas, etc.
"`Total project area shall be calculated to exclude Coastal Wetlands from use when calculating the built upon area
percentage calculation. This is the area used to calculate overall percent project built upon area (BETA).
9. How was the off -site impervious area listed above derived?_N�t applicable.
Projects in Union County: Contact the DWQ Central Office staff to check to see ifyou project is located
within a Threatened & Endangered Species watershed that may be subject to more stringent stormwater
requirements.
IV. DEED RESTRICTIONS AND PROTECTIVE COVENANTS
One of the following property restrictions and protective covenants are required to be recorded for all
subdivisions, outparcels and future development prior to the sale of any lot. If lot sizes vary significantly, a table
listing each lot number, size and the allowable built -upon area for each lot must be provided as an attachment
Forms can be downloaded from http://li2o.enr.State.nc.0 /su/bmp forms.htm- deed -restrictions.
Form DRPC-1
High Density Commercial Subdivisions
Form DRPC-2
High Density Developments with Outparcels
Form DRPC-3
High Density Residential Subdivisions
Form DRPC-4
Low Density Commercial Subdivisions
Form DRPC-5
Low Density Residential Subdivisions
Form DRPC-6
Low Density Residential Subdivisions with Curb Outlets
By your signature below, you certify that the recorded property restrictions and protective covenants for this
project shalt include all the applicable items required in the above farm, that the covenants will be binding
on all parties and persons claiming under them, that they will run with the land, that the required covenants
cannot be changed or deleted without concurrence from the NC DWQ, and that they will be recorded prior to
the sale of any lot.
V. SUPPLEMENTFORMS
The applicable state stormwater management permit supplement form(s) listed below must be submitted for
each BMP specified for this project. Contact the Stormwater Permitting Unit at [phone] for the status and
availability of these forms. Forms can be downloaded from http:// 12o.eiir.StatC.IIC.US/su/bm12 forms.htm,
Form SW401-Low Density
Form SW401-Curb Outlet System
Form SW401-Off-Site System
Form SW401-Wet Detention Basin
Form SW401-Infiltration Basin
Form SW401-Infiltration "french
Form SW401-Bioretention Cell
Form SW401-Level Spreader
Form SW401-Wetland
Form SW401-Grassed Swale
Form SW401-Sand Filter
Form SW401-Permeable Pavement
Form SW401-Cistern
Low Density Supplement
Curb Outlet System Supplement
Off -Site System Supplement
Wet Detention Basin Supplement
Infiltration Basin Supplement
Underground Infiltration Trench Supplement
Bioretention Cell Supplement
Level Spreader/Filter Strip/Restored Riparian Buffer Supplement
Constructed Wetland Supplement
Grassed Swale Supplement
Sand Filter Supplement
Permeable Pavement Supplement
Cistern Supplement
Form SWU-101 Version 09.25.08 Page 3 of

V1. SUBMITTAL REQUIREMENTS
Only complete application packages will be accepted and reviewed by the Division of Water Quality (DWQ).
A complete package includes all of the items listed below. The complete application package should be
submitted to the appropriate DWQ Office. (Appropriate office may be found by locating project on the
interactive online map at Ititp://h2o.enr.state.nc.tis/Suhnsi maps.litm)
1. Please indicate that you have provided the following required information by initialing in the space provided
next to each item.
In' 'als
• Original and one copy of the Stormwater Management Permit Application Form RWI
• Original and one copy of the Deed Restrictions & Protective Covenants Form (if NU7 rou"*(BD
required as per Part 1V above)
• Original of the applicable Supplement Form(s) and O&M agreement(s) for each BM? 64)
• Permit application processing fee of $505 (Express: $4,000 for HD, $2,000 for LD)
payable to NCDENR
• Calculations & detailed narrative description of stormwater treatment/management
• Copy of any applicable soils report
• Two copies of plans and specifications (sealed, signed & dated), including:
- Development/Project name
Engineer and firm
-Legend
- North arrow
- Scale
- Revision number & date
- Mean high water line
- Dimensioned property/project boundary
- Location map with named streets or NCSR numbers
Original contours, proposed contours, spot elevations, finished floor elevations
- Details of roads, drainage features, collection systems, and stormwater control measures
- Wetlands delineated, or a mote on plans that none exist
- Existing drainage (including off -site), drainage easements, pipe sizes, runoff calculations
- Drainage areas delineated
Vegetated buffers (where required)
VII. AGENT AUTHORIZATION
If you wish to designate authority to another individual or firm so that they may provide information on your
behalf (such as additional information requests), please complete this section. (ex. designing engineer or firm)
Designated agent (individual or firm): Cole]enest&Stone
Mailing Address: 150 Fayetteville Street, Suite 950
City: Raleigh State: NC Zip: 27601
Phone: ( 919 i 719-1800 Fax: ( 919 } 719-1819
Ei-nail:[e-mail]
VI11. APPLICANT'S CERTIFICATION
1. (nrint nr tune name of person listed in General Information. item 2) 1 flt'it 1 i t. �o or
certify that the information included on this permit application form is, to the best of my knowledge, correct and
that the project will be constructed in conformance with the approved plans, that the required deed restrictions
and protective cove ants will be recorded, and that the proposed project complies with the requirements of 15A
NCAC 2H .1000.
Signature: Date: t 61Z)99
Form SWU-101 Version 09.25,08 Page 5 of 4