SW6081002_CURRENT PERMIT_20081017

STORMWATER DIVISION CODING SHEET
POST -CONSTRUCTION PERMITS
PERMIT NO.
SW
DOC TYPE
[CURRENT PERMIT
(❑ APPROVED PLANS
❑ HISTORICAL FILE
❑ COMPLIANCE EVALUATION INSPECTION
DOC DATE
YYYYMMDD

Michael F. Easley, Governor
William G. Ross Jr., Secretary
North Carolina Department of Environment and Natural Resources
October 17, 2008
Phillip Ferrell
Assistant Superintendent of Auxiliary Services
1008 South l lt6 Street
Lillington, North Carolina 27546
Subject: Stormwater Permit No. SW6081002
High Density Stormwater Project
Harnett County Board of Education
Harnett Central High School
2911 Harnett Central Road, Angier, Harnett County
Dear Mr. Ferrell:
Coleco H. Sullins, Director
Division of Water Quality
DENR—FRO
NOV 19 2008
DWQ
The Stormwater Permitting Unit received a complete Stormwater Management Permit Application for
Harnett Central High School on October 13, 2008. Staff review of the plans and specifications has
determined that the project, as proposed, will comply with the Stormwater Regulations set forth in Title
15A NCAC 2H.1000 and Session Law 2006-246. We are forwarding Permit No. SW6081002, dated
October 17, 2008, 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 October 16, 2018, 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 Faytteville Regional Office. If you have any questions, or need
additional information concerning this matter, please contact Mike Randall at [phone]; or
[e-mail].
ncmail.net.
Sincerely,
for Coleen H. Sullins
cc: Fayetteville Regional Office
Tre Dugal, P.E. Wilbur Smith Associates
Central Files
SPU Files
N"o,�hCarolina
Wurully
North Carolina Division of Water Quality 1617 Mail Service Center Raleigh, NC 27699-1617 Phone [phone] Customer Service
Internet: www.ncwateruualitv.ore Location: 512 N. Salisbury St. Raleigh, NC 27604 Fax [phone]
An Equal OpportunitylAftirmative Action Employer —50% Recycled/l 0% Post Consumer Paper

State Stormwater Permit
Permit No. SW6081002
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
Harnett County Board of Education
Harnett Central High School
2911 Harnett Central Road, Angier, Harnett County
FOR THE
construction, operation and maintenance of one bioretention basinin compliance with
the provisions of Session Law 2006-246 and 15A NCAC 2H .1000 (hereafter referred to
as the "stormwater rules'l 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 October 16, 2018, 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 Section 1.6 of this permit. The stormwater control has been
designed to handle the runoff from 23,952 square feet of impervious area.
3. The tract will be limited to the amount of built -upon area as indicated in Section
1.6 of 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 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 6

State Stormwater Permit
Permit No. SW6081002
6. The following design criteria have been provided in the bioretention basin and
must be maintained at design condition:
a. Drainage Area, ftz:
b. Total Impervious Surfaces, ftz:
C. Design Storm, inches:
d. Max. Ponded Depth, feet:
e. Seasonal High Water Table, fmsl:
f. Planting Media Depth, feet:
g. Bottom Elevation, fmsl:
h. Bottom Surface Area, ft2:
i. Permitted Storage Volume, ft3:
j. Bypass / Storage Elevation, fmsl:
k. Predevelopment 1 year 24 hour ft3/sec:
I. Post development 1 year 24 hour ft /sec:
M. Drawdown Time, hours:
n. Underdrain Diameter, inches:
o. Receiving Stream:
p. River Basin:
q. Stream Index Number:
r. Classification of Water Body:
II. SCHEDULE OF COMPLIANCE
39,604
23,952
1"
12"
283.00
2'
290.00
3,000
1,950
293.00
0.03
.08
6 hours
4 inch
Tributary to West Buies Creek
Cape Fear
18-18-2-(2)
WS-IV
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 be repaired immediately.
3. The permittee shall at all time provide the operation and maintenance necessary
to assure the permitted stormwater system functions at optimum efficiency. The
approved Operation and Maintenance Plan must be followed in its entirety and
maintenance must occur at the scheduled intervals including, but not limited to:
a. Semiannual scheduled inspections (every 6 months).
b. Sediment removal.
C. Mowing and 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 basin and outlet structure must be available at all times.
4. Records of maintenance activities must be kept for each permitted BMP. The
reports will indicate the date, activity, name of person performing the work and
what actions were taken.
5. The permittee shall submit to the Division of Water Quality an annual summary
report of the maintenance 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.
Page 2 of 6

State Stormwater Permit
Permit No. SW6081002
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.
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 built -upon area or to the
drainage area.
e. Further subdivision, acquisition, lease or sale of all or part of the project
area. The project area is defined as all property owned by the permittee,
for which Sedimentation and Erosion Control Plan approval or a CAMA
Major permit was sought.
f. Filling in, altering, or piping of any vegetative conveyance shown on the
approved plan.
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.
Page 3 of 6

State Stormwater Permit
Permit No. SW6081002
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 DENR Staff permission to enter the property during normal
business hours for the purpose of inspecting all components of the permitted
stormwater management facility.
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.
Unless specified elsewhere, permanent seeding requirements for the stormwater
control must follow the guidelines established in the North Carolina Erosion and
Sediment Control Planning and Design Manual.
Approved plans and specifications for this project are incorporated by reference
and are enforceable parts of the permit.
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 Session 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.
Permit issued this the 17th day of October, 2008.
NORTH CAROLINA ENVIRONMENTAL MANAGEMENT COMMISSION
for Uofeen H. 5ullms, Uirectbr
Division of Water Quality
By Authority of the Environmental Management Commission
Page 4 of 6

State Stormwater Permit
Permit No. SW6081002
Harnett County Board of Education
Harnett Central High School
2911 Harnett Central Road, Angier, Harnett County
Stormwater Permit No. SW6081002
Designer's Certification
I, , as a duly registered in the
State of North Carolina, having been authorized to observe (periodically/ weekly/
full time) the construction of the project,
Harnett Central High School
for (Project Owner) hereby state that, to the
best of my abilities, due care and diligence was used in the observation of the project
construction such that the construction was observed to be built within substantial
compliance and intent of the approved plans and specifications.
The checklist of items on page 2 of this form is included in the Certification.
Noted deviations from approved plans and specification:
Signature
Registration Number
Date
SEAL
Page 5 of 6

State Stormwater Permit
Permit No. SW6081002
Certification Requirements:
1. The drainage area to the system contains approximately the permitted
acreage.
2. The drainage area to the system contains no more than the permitted
amount of built -upon area.
3. All the built -upon area associated with the project is graded such that the
runoff drains to the system.
4. All roof drains are located such that the runoff is directed into the system.
5. 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. All slopes are grassed with permanent vegetation, per the vegetation plan.
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,
and a forebay.
15. The required system dimensions are provided per the approved plans.
cc: NCDENR-DWQ Regional Office
Page 6 of 6

DWQ USE ONLY
Date Received
Fee Paid
Permit Number
# SC57
SlJioo�lbo:
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
I. GENERAL INFORMATION
1. Applicants name (specify the name of the corporation, individual, etc. who owns the project):
Harnett County Board of Education
2. Print Owner/Signing Official's name and title (person legally responsible for facility and compliance):
Phil Ferrell, Assistant Supervisor of Auxiliary Services
3. Mailing Address for person listed in item 2 above:
City:Lillington State:NC Zip:27
Phone: (910 ) 893-8151 Fax: (910 ) 893-8839
Email: [e-mail]
4. Project Name (subdivision, facility, or establishment name -should be consistent with project name on plans,
specifications, letters, operation and maintenance agreements, etc.):
Harnett County Schools; Additions to Harnett Central High School
5. Location of Project (street address):
2911 Harnett Central Road
City:Angier County:Harnett Zip:27501
6. Directions to project (from nearest major intersection):
From Angier take NC 210 Sounth; then left onto Harnett Central Road and the project is located in the corner
of Harnett Central Road and Neills Creek Road.
7. Latitude:35027' 48" N Longitude:78° 46' 4C W of project
8. Contact person who can answer questions about the project.
Name:Tre Dugal, PE Telephone Number: (919 ) 755-0583
Email:[e-mail]
II. PERMIT INFORMATION:
Form SWU-101 Version 03.27.08 Page 1 of

1. Specify whether project is (check one): ®New ❑Renewal ❑Modification
2. If this application is being submitted as the result of a renewal or modification to an existing permit, list the
existing permit number and its issue date (if known)
3. Specify the type of project (check one):
❑Low Density ❑High Density ❑Redevelop ❑General Permit ❑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 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.
Stormwater will be directed through closed piping systems and curb and gutter with a curb outlet into a
bioretention cell.
2. Stormwater runoff from this project drains to the Cape Fear River basin.
3. Total Property Area: 6.13 acres 4. Total Wetlands Area: 0 acres
5. 100' Wide Strip of Wetland Area: n/a acres (not applicable if no wetlands exist on site)
6. Total Project Area**:6.13 acres 7. Project Built Upon Area: %
8. How many drainage areas does the project have?2
9. 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 eneineered stormwater device.
Basin Information
Drainage Area 1
Drainage Area 2
Receiving Stream Name
Tributary to West Buies Creek
Tributary to West Buies Creek
Stream Class & Index No.
WSIV (18-18-2-(2))
WSIV (18-18-2-(2))
Total Drainage Area (so
On -site Drainage Area (so
203,392
75,714
Off -site Drainage Area (sf)
0
0
Existing Impervious* Area (so
133,279
52,605
Proposed Impervious*Area (so
18,158
14,485
% Impervious* Area (total)
74
89
Impervious* Surface Area
Drainage Area 1
Drainage Area 2
On -site Buildings (so
99,180
58,076
On -site Streets (so
10,896
0
On -site Parking (so
37,239
0
On -site Sidewalks (sf)
4,122
9,014
Other on -site (so
0
0
Off -site (so
0
0
Total (so:
151,437
67,090
Form SWU-101 Version 03.27.08 Page 2 of

* Impervious area is defined as the built upon area including, but not limited to, buildings, roads, parking areas,
sidewalks, gravel areas, etc.
**Total project area shall be calculated based on the current policy regarding inclusion of wetlands in the built upon area
percentage calculation. This is the area used to calculate percent project built upon area (BUA).
10. How was the off -site impervious area listed above derived
IV. DEED RESTRICTIONS AND PROTECTIVE COVENANTS
One of the following deed restrictions and protective covenants are required to be recorded for all subdivisions,
outparcels and future development prior to the sale of any lot. If lot sizes vary significantly, a table listing each lot
number, size and the allowable built -upon area for each lot must be provided as an attachment. Forms can be
downloaded from htto://h2o.enr.state.nc.us/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 DRPC4
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 deed restrictions and protective covenants for this
project shall include all the applicable items required in the above form, that the covenants will be binding
on all parties and persons claiming under them, that they will run with the land, that the required covenants
cannot be changed or deleted without concurrence from the State, and that they will be recorded prior to the
sale of any lot.
1 1191119JIM OMIL 91MUi9
The applicable state stormwater management permit supplement form(s) listed below must be submitted for each
BMP specified for this project. Contact the Stormwater and General Permits Unit at [phone] for the status
and availability of these forms. Forms can be downloaded from htto://h2o.enr.state.ne.us/su/bm6 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 Trench
Form SW401-Bioretention Cell
Form SW401-Level Spreader
Form SW401-Wetland
Form SW401-Grassed Swale
Form SW401-Sand Filter
Form SW401-Permeable Pavement
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
Form SWU-101 Version 03.27.08 Page 3 of

VI. SUBMITTAL REQUIREMENTS
Only complete application packages will be accepted and reviewed by the Division of Water Quality (DWQ).
A complete package includes all of the items listed below. The complete application package should be
submitted to the appropriate DWQ Office. (Appropriate office may be found by locating project on the
interactive online map at http://h2o.enr.state.nc.us/su/msi maus.htm)
Please indicate that you have provided the following required information by initialing in the space provided
next to each item.
Initials
• Original and one copy of the Stormwater Management Permit Application Form
`T b
• Original and one copy of the Deed Restrictions & Protective Covenants Form (if
N/-}
required as per Part IV above)
• Original of the applicable Supplement Form(s) and O&M agreement(s) for each BMP
-Lb
• Permit application processing fee of $505 (Express: $4,000 for HD, $2,000 for LD)
payable to NCDENR
'7 n
Calculations & detailed narrative description of stormwater treatment/management 't 4>
• Copy of any applicable soils report ? D
• Two copies of plans and specifications (sealed, signed & dated), including: i b
- Development/Project name,
- Engineer and firm-
- Legend ,
- North arrow .
-Scale
- Revision number & date -
- Mean high water line
- Dimensioned property/project boundary
- Location map with named streets or NCSR numbers
- Original contours, proposed contours, spot elevations, finished floor elevations
- Details of roads, drainage features, collection systems, and stormwater control measures
- Wetlands delineated, or a note on plans that none exist
- Existing drainage (including off -site), drainage easements, pipe sizes, runoff calculations
- Drainage areas delineated
- Vegetated buffers (where required)
VII. AGENT AUTHORIZATION
If you wish to designate authority to another individual or firm so that they may provide information on your
behalf, please complete this section. (ex. designing engineer or firm) . _
Designated agent (individual or firm):Wilbur Smith Associates - Tre Dugal, PE
Mailing Address:421 Fayetteville Street, Suite 1303
Phone: (919 ) 755-0583
Email:[e-mail]
VIII. APPLICANT'S CERTIFICATION
. State:NC Zip:27601
Fax: (919 ) 832-8798
I, (print or type name of person listed in General Information, item 2) Phil Ferrell
certify that the information included on this permit application form is, to the best of my Rnowledge, correct and
that the project will be constructed in conformance with the approved plans, that the required deed restrictions
and protective covenants will be recorded, and that the proposed project complies with the requirements of 15A
NCAC 2H 000.
0[3 Signature. Date: -
Form SWU-101 Version 03.27.08 Page 4 of

Permit
(to be provided by DWQ)
Drainage Area Number:
Bioretention Operation and Maintenance Agreement
I will keep a maintenance record on this BMP. This maintenance record will be kept in a
log in a known set location. Any deficient BMP elements noted in the inspection will be
corrected, repaired or replaced immediately. These deficiencies can affect the integrity
of structures, safety of the public, and the removal efficiency of the BMP.
Important operation and maintenance procedures:
— Immediately after the bioretention cell is established, the plants will be watered
twice weekly if needed until the plants become established (commonly six
weeks).
— Snow, mulch or any other material will NEVER be piled on the surface of the
bioretention cell.
— Heavy equipment will NEVER be driven over the bioretention cell.
— Special care will be taken to prevent sediment from entering the bioretention cell.
— Once a year, a soil test of the soil media will be conducted.
After the bioretention cell is established, I will inspect it once a month and within 24
hours after every storm event greater than 1.0 inches (or 1.5 inches if in a Coastal
County). Records of operation and maintenance will be kept in a known set location
and will be available upon request.
Inspection activities shall be performed as follows. Any problems that are found shall
be repaired immediately.
BMP element:
Potentialproblems:
How I will remediate theproblem:
The entire BMP
Trash/debris is present.
Remove the trash/debris.
The perimeter of the
Areas of bare soil and/or
Regrade the soil if necessary to
bioretention cell
erosive gullies have formed.
remove the gully, and then plant a
ground cover and water until it is
established. Provide lime and a
one-time fertilizer application.
The inlet device: pipe,
The pipe is clogged (if
Unclog the pipe. Dispose of the
stone verge or swale
applicable).
sediment off -site.
The pipe is cracked or
Replace the pipe.
otherwise damaged (if
applicable).
Erosion is occurring in the
Regrade the swale if necessary to
swale (if applicable).
smooth it over and provide erosion
control devices such as reinforced
turf matting or riprap to avoid
future problems with erosion.
Stone verge is clogged or
Remove sediment and clogged
covered in sediment (if
stone and replace with clean stone.
applicable).
Form SW401-Bioretention O&M-Rev.3 Page 1 of 4

BMP element:
Potentialproblems:
How I will remediate theproblem:
The pretreatment area
Flow is bypassing
Regrade if necessary to route all
pretreatment area and/or
flow to the pretreatment area.
]lies have formed.
Restabilize the area after grading.
Sediment has accumulated to
Search for the source of the
a depth greater than three
sediment and remedy the problem if
inches.
possible. Remove the sediment and
restabilize the pretreatment area.
Erosion has occurred.
Provide additional erosion
protection such as reinforced turf
matting or riprap if needed to
prevent future erosion problems.
Weeds are present.
Remove the weeds, preferably by
hand.
The bioretention cell:
Best professional practices
Prune according to best professional
vegetation
show that pruning is needed
practices.
to maintain optimal plant
health.
Plants are dead, diseased or
Determine the source of the
dying.
problem: soils, hydrology, disease,
etc. Remedy the problem and
replace plants. Provide a one-time
fertilizer application to establish the
ground cover if a soil test indicates
it is necessary.
Tree stakes/wires are present
Remove tree stake/wires (which
six months after planting.
can kill the tree if not removed).
The bioretention cell:
Mulch is breaking down or
Spot mulch if there are only random
soils and mulch
has Floated away.
void areas. Replace whole mulch
layer if necessary. Remove the
remaining much and replace with
triple shredded hard wood mulch at
a maximum depth of three inches.
Soils and/or mulch are
Determine the extent of the clogging
clogged with sediment.
- remove and replace either just the
top layers or the entire media as
needed. Dispose of the spoil in an
appropriate off -site location. Use
triple shredded hard wood mulch at
a maximum depth of three inches.
Search for the source of the
sediment and remedy the problem if
possible.
An annual soil test shows that
Dolomitic lime shall be applied as
pH has dropped or heavy
recommended per the soil test and
metals have accumulated in
toxic soils shall be removed,
the soil media.
disposed of properly and replaced
with new planting media.
Form SW401-Bioretention O&M-Rev.3 Page 2 of 4

BMP element:
Potentialproblems:
How I will remediate theproblem:
The underdrain system
Clogging has occurred.
Wash out the underdrain system.
(if applicable)
The drop inlet
Clogging has occurred.
Clean out the drop inlet. Dispose of
the sediment off -site.
The drop inlet is damaged
Repair or replace the drop inlet.
The receiving water
Erosion or other signs of
Contact the NC Division of Water
damage have occurred at the
Quality 401 Oversight Unit at 919-
outlet.
733-1786.
Form SW401-Bioretention O&M-Rev.3 Page 3 of 4

Permit
(to be provided by DJVQ)
I acknowledge and agree by my signature below that I am responsible for the
performance of the maintenance procedures listed above. I agree to notify DWQ of any
problems with the system or prior to any changes to the system or responsible party.
Project name:Hamett County Schools- Additions to Harnett Central High School
BMP drainage area number:
Print
Title:Assistant Supervisor of Auxiliary Services
Address:PO Box 1029 Lillington NC 27546
Date: `7 -1�G - UH
Note: The legally responsible party should not be a homeowners association unless more than 50% of
the lots have been sold and a resident of the subdivision has been named the president.
1'',�O'61411 (, • y//� a Notary Public for the State of
/10leM 6f011l) a? County of JV&A- e�4 do hereby certify that
j�� personally appeared before me this
day ofIjp � ".' �' and acknowledge the due execution of the
forgoing bioretention maintenance requirements. Witness my hand and official seal,
SEAL
My commission expires 7 -1�2 ^ ;� dV0
Form SW401-Bioretention I&M-Rev. 2 Page 4 of 4

(to be provided by DWQ)
020p W ATF9
��A y r
NCDENR
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 III) must be printed, filled out and submitted along with all of the required information.
IF! P-ROJECTJNFORMATIONF*+ z�:?,`..: »�. ; ,; ui 7 ::% tmaF�_. " stR
Project name Harnett Central High School
Contact name Tre Dugal, PE
Phone number
Date
Drainage area number
Il':,DESIGNINFORMATION?dry ,-Ii
Site Characteristics
Drainage area
39,640.00 ft2
Impervious area
23,952.00 ft2
Percent impervious
60.4% %
Design rainfall depth
1.00 inch
Peak Flow Calculations
1-yr, 24-hr runoff depth
3.00 in
1-yr, 24-hr intensity
0.12 in/hr
Pre -development 1-yr, 24-hr peak flow
0.03 ft3/sec
Post -development 1-yr, 24-hr peak flow
0.08 ft3/sec
Pre/Post 1-yr, 24-hr peak control
0.05 ft3/sec
Storage Volume: Non -SR Waters
Design volume
1,950.00 ft3
Storage Volume: SR Waters
Pre -development 1-yr, 24-hr runoff
ft3
Post -development 1-yr, 24-hr runoff
ft3
Minimum volume required
0.00 ft3
Volume provided
ft3
Cell Dimensions
Ponding depth of water
12.00 inches OK
Ponding depth of water
1.00 ft
Surface area of the top of the bioretention cell
3000.00 ft2 OK
Length:
Varies ft OK
Width:
Varies ft OK
-or- Radius
ft
Soils Report Summary
Drawdown time, ponded volume
6.00 hT
OK
Drawdown time, to 24 inches below surface
12.00 hr
OK
Drawdown time, total:
18.00 hr
In -situ soil:
Soil permeability
N/A inthr
OK
Planting media soil:
Soil permeability
2.00 in/hr
. OK
Soil composition
• Sand (by weight)
88%
OK
% Fines (by weight)
8%
OK
• Organic (by weight)
4%
OK
Total: 100%
Form SW401-Bioretention-Rev.3 Parts I and 11. Design Summary, Page 1 of 2

Iro oe provoea oyVWU/
Phosphorus Index (P-Index)
Basin Elevations
Temporary pool elevation
Planting elevation (top of the mulch)
Bottom of the cell
Planting depth
Depth of mulch
SHWT elevation
Are underdrains being installed?
How many clean out pipes are being installed?
What factor of safety is used for sizing the underdrains? (See
BMP Manual Section 12.3.6)
Additional distance between the bottom of the planting media and
the bottom of the cell to account for underdrains
Bottom of the cell required
Distance from bottom to SHWT
Type of bioretention cell (answer "Y" to only one of the two
following questions):
Is this a grassed cell?
Is this a cell with trees/shrubs?
Planting Plan
Number of tree species
Number of shrub species
Number of herbaceous groundcover species
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 feel from surface waters (50 feet if
SA waters)?
Is the BMP localed 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 recorded drainage easement with a
recorded access easement 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 cell)
Gravel and grass
(flinches gravel followed by 3-5 ft of grass)
Grassed swale
Forebay
20 (unitless) OK
293.00 fmsl
292.00 fmsl OK
290.00 fmsl
2.00 It
2.00 inches OK
283.00 fmsl OK
Y (Y or N)
3 OK
10.00 OK
1 ft
289.00 fmsl
6.00 ft OK
Y (Y or N) OK
N (Y or N)
3 OK
Y (Y or N) OK
N (Y or N) Excess volume must pass through filter
it
N (Y or N)
Show how flow is evenly distAbuted.
Y (Y or N)
OK
Y (Y or N)
OK
Y (Y or N)
OK
Y (Y or N)
OK
11.50 ft/sec
Insufficient inlet velocity unless energy dissipating devices are
being used.
N (Y or N)
OK
N (Y or N)
OK
Y (Y or N)
OK
OK
Form SW401-Bioretention-Rev.3 Parts I and II. Design Summary, Page 2 of 2

rerm r No:
(to be assigned by DWQ)
III."REQUIRED,ITEMSCHECKLIST.. A*:_its ....s
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.
CO. Q —
1. Plans (1' - 50' or larger) of the entire site showing:
C4.2
- 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,
- Proposed drainage easement and public right of way (ROW),
- Clean out pipe locations,
- Overflow device, and
- Boundaries of drainage easement.
D C 3
2. Plan details IV = 30' or larger) for the bioretention cell showing:
t i.2
Cell dimensions
- Pretreatment system,
- High Flow bypass system,
- Maintenance access,
- Recorded drainage easement and public right of way (ROW),
Design at ultimate build -out,
- Off -site drainage (if applicable),
- Clean out pipe locations,
Overflow device, and
Boundaries of drainage easement.
T �'i.2
3. Section view of the bioretention cell (1' = 20' or larger) showing:
- Side slopes, 3:1 or lower
- Underdrain system (if applicable), and
- Bioretenlion cell layers [ground level and slope, pre-treatment, ponding 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]
4. A soils report that is based upon an actual field investigation, soil borings, and infiltration 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 feel 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
-
- P-index.
i y.2
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.
6. A construction sequence that shows how the bioretention cell will be protected from sediment until the
entire drainage area is stabilized.
7. The supporting calculations (including underdrain calculations, if applicable).
8. A copy of the signed and notarized operation and maintenance (O&M) agreement.
9. A copy of the deed restrictions (if required).
Form SW401-Bioretention-Rev.3 Part III, Page 1 of 1

0
O
C�
/lll� CINEEAS
RAF ��� rwu eas SUBJECT IBC I f S JOB NO. SH OF
air ECONCMI. t BY -71 DATE
Wilbur Smith AssociatesS� S �U^ CH. T DATE
(� Fiu,j 2-tc, - Z%
G, I\+ cG� CCa� 3000 st)
0.14 A o,�3 \ g
6. 7Z
I