SW6090303_CURRENT PERMIT_20090331

STORMWATER DIVISION CODING SHEET
POST -CONSTRUCTION PERMITS
PERMIT NO.
SW���i9?�©3
DOC TYPE
In CURRENT PERMIT
APPROVED PLANS
❑ HISTORICAL FILE
❑ COMPLIANCE EVALUATION INSPECTION
DOC DATE
YYYYMMDD
I

ANA
MENR
North Carolina Department of Environment and Natural Resources
Division of Water Quality
Beverly Eaves Perdue Coleen H. Sullins Dee Freeman
Governor Director Secretary
March 31, 2009 RECEIVE®
Mr. Merrick Dugal, III, PE WAY 0 5
Wilbur Smith Associates
421 Fayetteville Street, Suite 1303 DHJH-FA
Raleigh, North Carolina 27601 .RC{>YOW4DFACE
Subject: Phase II Post -Construction Stormwater Permit
Stormwater Project No. SW6090303
Sandhills Community College
Hoke County
Dear Mr. Dugal:
The Stormwater Permitting Unit received a complete Stormwater Management Permit Application for
Sandhills Community College on March 31, 2009. 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. SW6090303, dated March 31,
2009, 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 March 30, 2019, 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 amritten 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 Fayetteville Regional Office. If you have any questions, or
need additional information concerning this matter, please contact Mike Randall at [phone];'or
[e-mail].
Sincerely,.
for Coleen H. Sullins.
cc: 'Fayetteville Regional Office
Uentral Files - -
SPU Files
Wetlands and Stormwater Branch
1617 Mail Service Center, Raleigh, North Carolina 27699-1617 - - One , Location: 512 N. Salisbury St. Raleigh, North Carolina 27604 - NOrul�+^al O1 ina
Phone: [phone] FAX: [phone] Customer Service: 1-877-623-6748
Internet: mm.newaterquality.org 1 Kee
An Equal Opportunity 1 Afiirmafive Action Employer - _

State Stormwater Permit
Permit No.SW6090303
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
Sandhills Community College
1110 East Central Avenue,Raeford, North Carolina
Hoke County
FOR THE
construction, operation and maintenance of a wet detention pond in compliance with
the provisions of 15A NCAC 2H A 000 and S.L. 2006-246 (hereafter referred to as the
'stormwaterrules') and the approved stormwater management plans and specifications
and other supporting data as attached and on file with and. approved by the Division of
Water Quality and considered a part of this permit.
This permit shall be effective from the date of issuance until March 30, 2019, 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 on page 2 of this permit. The stormwater
control has been designed to handle the runoff from 78,844 square feet of
impervious area.
3. The tract will be limited to the amount of built -upon area indicated on page 2 of
this permit, and per 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.
Page 1 of 6

State Stormwater Permit
Permit NO.SVV6090303
6. The following design criteria have been provided in the wet detention pond and
must be maintained at design condition:
a: Drainage Area, acres: 2.59
Onsite, ft : 112
b. Total Impervious Surfaces, ft2: 12,820
Buildings ft2: 78,844
Roads/Parking, ft2: 4,810
Other, ft2: 3,485 (sidewalks)
075
Offsite, ft2: 0
c. Pond Depth, feet: 3.0
d. TSS removal efficiency: 90%
e. Design Storm: 1.0 inch
f. Permanent Pool Elevation, FMSL: 101.25
g. Permanent Pool Surface Area @PP ft2: 7,225
h. Permanent Pool Storage Volume, ftj: 21,700
i. Temporary Pool Elevation, FMSL: 104.50
J. Controlling Orifice: 3 1.0"0 pipe
k. Forebay Volume, ft : 4,140
I. Receiving Stream/River Basin: Pedler Branch/Cape Fear
M. Stream Index Number: 18-31-6
n. Classification of Water Body: 6
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 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. Semiannual scheduled inspections (every 6 months).
b. Sediment removal.
C. Mowing and revegetation of slopes and the vegetated filter.
A. Immediate repair of eroded areas.
e. Maintenance of all slopes in accordance with approved plans and
specifications.
f. Debris removal and unclogging of outlet structure, orifice device, flow
spreader, catch basins and piping.
g. Access to the outlet structure must be available at all times.
4. Records of maintenance activities must be kept and made available upon
request to authorized personnel of DWQ. The records will indicate the date,
activity, name of person performing the work and what actions were taken.
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 approvedplans and specifications, and other
supporting data.
Page 2 of 6

State Stormwater Permit
t` Permit No.SW6090303
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. A
modification may be required for those deviations.
7. 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.
8. Access to the stormwater facilities shall be maintained via appropriate
easements at all times.
9. 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. .
10. The permittee shall submit final site layout and grading plans for any permitted
future areas shown on the approved plans, prior to construction.
11. A copy of the approved plans and specifications shall be maintained on file by
the Permittee for a minimum of ten years from the date of the completion of
construction.
12. 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,.to the Division of Water
Quality, signed by both parties, and accompanied by supporting documentation
as listed on page 2 of the form. The project must be in good standing with the
Division. 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
Page 3 of 6

State Stormwater Permit
Permit No.SW6090303
time as the Division 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) having jurisdiction.
5.1 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.
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 Session Law 2006-
246, Title 15A NCAC 2H.1000, and NCGS 143-215.1 et.al.
11.The permittee shall notify the Division 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 315'. day of March, 2009.
NORTH CAROLINA ENVIRONMENTAL MANAGEMENT COMMISSION
for Coleen H. Sullins, Director
Division of Water Quality
By Authority of the Environmental Management Commission
Page 4 of 6

State Stormwater Permit
Permit No.SW6090303
Sandhills Community College.
1110 East Central Avenue,Raeford, North Carolina
Hoke County

State Stormwater Permit
Permit No.SW6090303
Sandhills Community College
1110 East Central Avenue,Raeford, North Carolina
Hoke County
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. .
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.
Please submit this Designer's Certification to: Fayetteville. Regional Office
Surface Water Protection

DWQ USE ONLY
Date Received
Fee Paid
Permit Number
-61 Z� o
Gas -
InJ b a3
State of North Carolina
Department of Environment and Natural Resources
Division of Water Quality
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
This fornz 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):
Sandhills Communi College
2. Print Owner/Signing Official's name and title (person legally responsible for facility and compliance):
Richard 1. Gough/ Vice President of Business and Administrative Services
3. Mailing Address for person listed in item 2 above:
City:Southern Pines State:NC Zip:28374
Phone: (910 ) 695-3706 Fax: (910 ) 692-4794
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.):
Hoke Campus New Early College Building
5. Location of Project (street address):
1110 East Central Avenue
City:Raeford County:Hoke Zip:28376
6. Directions to project (from nearest major intersection):
From Raeford take Highway 401 Business North, the project is located at the intersection of Patterson Avenue
and HWY 401 N Bus.
7. Latitude:35° 58' 36" N Longitude:79° 12' 19" W of project
8. Contact person who can answer questions about the project:
Name:Merrick (Tre) Dugal, III, PE Telephone Number: (919 ) 755-0583
Email:[e-mail]
II. PERMIT INFORMATION:
Form SWU-101 Version 03.27.08 Page 1 of 4

2. If this application is being submitted as the result of a renewal or modification to an existing permit, list the
existing permit number and its issue date (if known)
3. Specify the type of project (check one):
❑Low Density ❑High Density ❑Redevelop ❑General Permit ❑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
III. 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 sheetflow across a parking lot into a swale that
directs the water into a wet detention pond with a forebay. The existing site does not allow for a suitable
vegetated swale location due to site constraints and existing terrain conditions. The outlet structure of the pond is
piped into an existing closed Ripe system on campus.
2. Stormwater runoff from this project drains to the Cape Fear River basin.
3. Total Property Area: 10.23 acres' 4. Total Wetlands Area: 0 acres
5. 100' Wide Strip of Wetland Area: n/a acres (not applicable if no zoetlands exist on site)
6. Total Project Area**:3.82 acres 7. Project Built Upon
8. How many drainage areas does the project have?1
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 engineered stormwater device.
Basin Information
Drainage Area 1
Drainage Area 2
Receiving Stream Name
Pedler Branch
Stream Class & Index No.
C (18-31-6)
Total Drainage Area (sf)
On -site Drainage Area (sf)
112,820
Off -site Drainage Area (sf)
0
Existing Impervious* Area (sf)
0
Proposed Impervious*Area (so
78,844
% Impervious* Area (total)
69
Impervious* Surface Area
Drainage -Area 1
Drainage Area 2
On -site Buildings (sf)
14,810
On -site Streets (sf)
9,075
On -site Parking (so
51,474
On -site Sidewalks (sf)
3,485
Other on -site (sf)
0
Off -site (sf)
0
Total (sf):
78,844
Form SWU-101 Version 03.27.08 Page 2 of 4

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 dull 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
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 httu://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 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 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.
V. SUPPLEMENT FORMS
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 httn://h2o.enr.state.nc.us/su/bmp 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 maps hmi)
Please indicate that you have provided the following required information by initialing in the space provided
next to each item.
• Original and one copy of the Stormwater Management Permit Application Form
Initials
Wr6
• Original and one copy of the Deed Restrictions & Protective Covenants Form (if
required as per Part IV above)
• Original of the applicable Supplement Form(s) and O&M agreement(s) for each BMP
tinA'Q
• Permit application processing fee of $505 (Express: $4,000 for HD, $2,000 for LD)
payable to NCDENR
tt\�t
• Calculations & detailed narrative description of stormwater treatment/management
Alto
• Copy of any applicable soils report
ON�
• Two copies of plans and specifications (sealed, signed & dated), including:
MO
- 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 - Merrick (TLe) Dugal, III, PE
Mailing Address:421 Fayetteville Street, Suite 1303
City:Raleigh State:NC Zip:27601
Phone: (919 ) 755-0583
Email:[e-mail]
VIII. APPLICANT'S CERTIFICATION
Fax: (919 ) 832-8798
I, (print or hype name of person listed in General Information, item 2) Richard 1. Gough
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 covenants will be recorded, and that the proposed project complies with the requirements of 15A
NCAC 21-1.1000.
Date:
Form SWU-101 Version 03.27.08 Page 4 of 4

ENGINEERS
//MM// PLANNERS
ECONOMISTS
WiIbu6mith
A S S 0 C I A T E S
March 4, 2009
Mr. Mike Randall
Stormwater and General Permits Unit
1617 Mail Service Center
Raleigh, NC 27699-1617
RE: Sandhills Community College; Hoke Campus Early College Building
Stormwater Management Permit Application
Dear Mr. Randall:
The following items are in response to the review comments issued on 02/16/09 for the above
referenced project.
2.
3.
4.
5.
6.
7.
8.
9.
10.
Calculations have been revised for clarity and consistency between the calculations and
the supplement. The plan and section of the pond have been revised to reflect the 10-
foot vegetated shelf. The trash rack has been added to the plans along with a detail.
The orifice drawdown calculation has been revised to reflect the correct head of 1.08
feet, or 1/3 of the distance from the drop inlet to the PPE.
A 10-foot wide vegetated shelf has been added to the pond, with elevations shown for
the top and bottom of the shelf. The pond section has also been revised to reflect the
shelf.
A landscaping plan has been provided. The construction document set that has been
submitted to your office for review is for the grading package only. The building
package will be bid at a later date and will contain the landscaping plan for the pond,
once final buildout is complete.
A detail for the "tee" type configuration has been added to sheet G203.
A note has been added to sheet G201 stating the following: NO WATERCOURSE OR
WETLANDS AS DEFINED BY ANY FEDERAL, STATE, OR LOCAL AUTHORITY
ARE LOCATED IN THE PROJECT AREA.
The wet detention pond has been designed for 90% TSS removal and therefore a 30 foot
vegetative filter strip is not required.
The area to the east of the property is the top of a ridge (elev. 108) and drains towards
the south. No offsite drainage is entering the site.
The calculations and wet pond have been revised to result in the required average depth
of 3.0 ft.
A clay liner will be provided in the pond. Specifications have been provided.
mt depth has been provided at the bottom of the pond and was not
verage depth calculations.
421 Fayetteville Street, Suite 1303 Raleigh, NC 27601
919.755.0583 f919.832.8798 www.WilburSmith.com

Sandhills Community College; Hoke Campus Early College Building
Stormwater Management Permit Application
March 4, 2009
Page 2 of 2
12. The roof drain leaders all tie to Catch Basin No. 2. They will be constructed under the
building contract and were left off of these plans to avoid confusion for the early grading
package contract. A copy of the final sheet C3.0 has been provided.
Over all, this project is being broken into two phases, an early site grading contract and a
building contract. The pond will function as a temporary sediment trap during the construction
phases of this project. Upon substantial completion of the building project (Phase 2), the pond
will be regraded to remove sediment and restore to the dimensions on the plans and the clay liner
will be installed along with the landscape on the 10-foot wide vegetative shelf.
Attached please find the following:
a. 1 —original of Stormwater Management Permit Application (previously submitted)
b. 1 — copy of Stormwater Management Permit Application
c. I — original of Bioretention Operation and Maintenance Agreement
d. I — original of Supplemental Form
e. I — copy of storm drainage specifications, erosion control specifications, clay liner specification,
and landscape planting specification and geotechnical report
f. 1 — copy of Stormwater calculations
g. 2 — copies of plans
h. 1 —check
Please review and if you have any questions or need any additional information, do not hesitate to call
me.
Sincerely,
WILBUR SMITH ASSOCIATES
6�
Tre Dugal, P.E.
Project Manager
Attachments
WASandhills 21 - Hoke Phase 3TeriAts\NCDWQ RHSPONSE_LTR_022409.doe
c: Ron Peters, Sandhills Community College
Angie Crawford, MBAJ

Permit Number:
(to be provided by DWQ)
Drainage Area Number:
Wet Detention Basin 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.
The wet detention basin system is defined as the wet detention basin,
pretreatment including forebays and the vegetated filter if one is provided.
This system (check one):
❑ does ® does not incorporate a vegetated filter at the outlet.
This system (check one):
❑ does ® does not incorporate pretreatment other than a forebay.
Important maintenance procedures:
— Immediately after the wet detention basin is established, the plants on the
vegetated shelf and perimeter of the basin should be watered twice weekly if
needed, until the plants become established (commonly six weeks).
— No portion of the wet detention pond should be fertilized after the first initial
fertilization that is required to establish the plants on the vegetated shelf.
— Stable groundcover should be maintained in the drainage area to reduce the
sediment load to the wet detention basin.
— If the basin must be drained for an emergency or to perform maintenance, the
flushing of sediment through the emergency drain should be minimized to the
maximum extent practical.
— Once a year, a dam safety expert should inspect the embankment.
After the wet detention pond is established, it should be inspected 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 should be kept in a known set
location and must be available upon request.
Inspection activities shall be performed as follows. Any problems that are found shall
be repaired immediately.
BMP element:
Potentialproblem:
How I will remediate theproblem:
The entire BMP
Trash/debris is present.
Remove the trash/debris.
The perimeter of the wet
Areas of bare soil and/or
Regrade the soil if necessary to
detention basin
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.
Vegetation is too short or too
Maintain vegetation at a height of
long.
approximately six inches.
Form SW401-Wet Detention Basin O&M-Rev.4 Page 1 of 4

Permit Number:
(to be provided by DWQ)
Drainage Area Number:
BMP element:
Potentialproblem:
How I will remediate theproblem:
The inlet device: pipe or
The pipe is clogged.
Unclog the pipe. Dispose of the
swale
sediment off -site.
The pipe is cracked or
Replace the pipe.
otherwise damaged.
Erosion is occurring in the
Regrade the swale if necessary to
swale.
smooth it over and provide erosion
control devices such as reinforced
turf matting or riprap to avoid
future problems with erosion.
The forebay
Sediment has accumulated to
Search for the source of the
a depth greater than the
sediment and remedy the problem if
original design depth for
possible. Remove the sediment and
sediment storage.
dispose of it in a location where it
will not cause impacts to streams or
the BMP.
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. If pesticide is used, wipe it on
the plants rather than spraying.
The vegetated shelf
Best professional practices
Prune according to best professional
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.
Weeds are present.
Remove the weeds, preferably by
hand. If pesticide is used, wipe it on
the plants rather than spraying.
The main treatment area
Sediment has accumulated to
Search for the source of the
a depth greater than the
sediment and remedy the problem if
original design sediment
possible. Remove the sediment and
storage depth.
dispose of it in a location where it
will not cause impacts to streams or
the BMP.
Algal growth covers over
Consult a professional to remove
50% of the area.
and control the algal growth.
Cattails, phragmites or other
Remove the plants by wiping them
invasive plants cover 50% of
with pesticide (do not spray).
the basin surface.
Form SW401-Wet Detention Basin O&M-Rev.4 Page 2 of 4

Permit Number:
(to be provided by DWQ)
Drainage Area Number:_
BMP element:
Potentialproblem:
How I will remediate theproblem:
The embankment
Shrubs have started to grow
Remove shrubs immediately.
on the embankment.
Evidence of muskrat or
Use traps to remove muskrats and
beaver activity is present.
consult a professional to remove
beavers.
A tree has started to grow on
Consult a dam safety specialist to
the embankment.
remove the tree.
An annual inspection by an
Make all needed repairs.
appropriate professional
shows that the embankment
needs repair. if applicable)
The outlet device
Clogging has occurred.
Clean out the outlet device. Dispose
of the sediment off -site.
The outlet device is damaged
Repair or replace the outlet device.
The receiving water
Erosion or other signs of
Contact the local NC Division of
damage have occurred at the
Water Quality Regional Office, or
outlet.
the 401 Oversight Unit at 919-733-
1786.
The measuring device used to determine the sediment elevation shall be such
that it will give an accurate depth reading and not readily penetrate into.
accumulated sediments.
When the permanent pool depth reads 96.75 feet in the main pond, the
sediment shall be removed.
When the permanent pool depth reads 103.50 feet in the forebay, the sediment
shall be removed.
Sediment Removal
Bottom
BASIN DIAGRAM
ill in the blanks)
Permanent Pool Elevation 105.50
113.51 Pe maven Pool
------------------ Volume Sediment Removal Elevation 96.75 Volume
102.50 eft Min.
------ Sediment
Elevation
----------- ------
Sediment Bottom Elevation 95.75 left n
Storage Sedimer
Storage
FOREBAY MAIN POND
Form SW401-Wet Detention Basin O&M-Rev.4 Page 3 of 4

Permit Number:
(to be provided by DWQ)
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:Sandhills Community College Hoke Campus New Early College Building
BMP drainage area number:
Print
Title
Note: The legally responsible parry should not be a homeowners association unless more than 50% of
the lots have been sold and a resident of the subdivision has been named the president.
I, /1 wbe l GQ q �,'A rC✓ _,a Notary Public for the State of
nlOz�� 0u ro /t na// County of /l�q�2 do hereby certify that
I Aa rd —J.C;OLtq h personally appeared before me this 3 Y d
day of _February J , 2009 , and acknowledge the due execution of the
forgoing wet detention basin maintenance requirements. Witness my hand and official
seal,
G'J
SEAL
P '6t
My commission expires J// q/02 D /
Form SW401-Wet Detention Basin O&M-Rev.4 Page 4 of 4

Permit
no be provided by D WOf
NCDE`N
Project name
Contact person
Phone number
Date
Drainage area number
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATION APPLICATION FORM
WET DETENTION BASIN SUPPLEMENT
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 of the required information.
[phone]
3/4/2009
Sandhills
o�0F W ArFgo`
g C
o -c
I3DESIG NI IN F,O RMATIO N
Site Characteristics
Drainage area 112,820.00 ft3
Impervious area 78,843.00 h2
% impervious 69.88 % $ t O. �t Z A
Design rainfall depth 1.00 in jtJ = b • O S t 0,4 64
Storage Volume: Non -SR Waters
Minimum volume required
Volume provided
Storage Volume: SR Waters
1-yr, 24-hr runoff depth
Pre -development 1-yr, 24-hr runoff
Post -development 1-yr, 24-hr runoff
Minimum volume required
Volume provided
Peak Flow Calculations
1-yr, 24-hr rainfall depth
Rational C, pre -development
Rational C, post -development
Rainfall intensity: 1-yr, 24-hr storm
Pre -development 1-yr, 24-hr peak flow
Post -development 1-yr, 24-hr peak flow
Pre/Post 1-yr, 24-hr peak flow control
Basin Elevations
Basin bottom elevation
Sediment cleanout elevation
Bottom of shelf elevation
Permanent pool elevation
SHWT elevation
Top of shelf elevation
Temporary pool elevation
F-V
' .G 2I5
6,393.00
ft3
21,700.00
f0
in
V
= 3630 Cli (•62�(Z.S�(�
„3
v=S,*43fr3
ft3
h3
3.05
in
0.30
(unitless)
LA&AMS
ka" So Is.
0.75
(unitless)
in/hr ?
✓
LOW
TG a 1
0.13
0.10
It'/sec
VJ
\
0.26
ft3/sec
ft3/sec
•S:
3�03 L5.$SS
0.16
"TG = C�J /,ZS
95.75
itl� Y�-
96.75
If
100.75
It
101.25
ft
CLAY LINER
It
101.75
It
104.50
It
Form SW401-Wet Detention Basin-Rev.4 Pans I. a II. Design Summary, Page 1 of 2

Permit
be provided by OWO)
Volume and Surface Area Calculations
SA/DA ratio
Surface area at the bottom of shelf
Volume at the bottom of shelf
Permanent pool, sudace area required
Permanent pool, surface area provided
Permanent pool volume
Average depth for SA/DA tables
Surface area at the top of shelf
Volume at the top of shelf
Forebay volume
Forebay % of permanent pool volume
Temporary pool, surface area provided
Drawdown Calculations
Treatment volume drawdown time
Treatment volume discharge rate
Pre -development 1-yr, 24-hr discharge
Post -development 1-yr, 24-hr discharge
Additional Information
Diameter of orifice
Design TSS removal
Basin side slopes
Vegetated shelf slope
Vegetated shelf width
Length of flowpath to width ratio
Length to width ratio
Trash rack for overflow & orifice?
Freeboard provided
Vegetated filter provided?
Recorded drainage easement provided?
Capures all runoff at ultimate build -out?
Drain mechanism for maintenance or emergencies
5.50
(unitless)
5,724.00
f?
14,452.00
ft'
6,205.00
f�
7,225.00
ft'
21,700.00
ft'
3.00
ft
9,114.00
fe
20,7000
ft'
4,140.00
ft'
19.08
%
10.844.00
f?
4.89 days
0.10 ft3/s
0.10 tt3/s
0.10 It%
1
in
90
% r�
3.00
:1
10.00
:1
10.00
ft
3.00
:1
1.65
:1
Y
(Y or N)
1.00
ft
N
(Y or N)
Y
(Y or N)
Y
(Y or N)
rumr vu i
OK
OK
OK
OK
OK
OK
OK
OK
OK
OK
OK
OK
OK
Design must be based on 90% TSS removal ✓
OK
OK
Form SW401-Wet Detention Basin-Rev.4 Parts I. & II. Design Summary, Page 2 of 2