SW6081105_CURRENT PERMIT_20081219

STORMWATER DIVISION CODING SHEET
POST -CONSTRUCTION PERMITS
PERMIT NO. SW &eYlIK'
DOC TYPE CURRENT PERMIT
APPROVED PLANS
❑ HISTORICAL FILE
❑ COMPLIANCE EVALUATION INSPECTION
DOC DATE,x� �7
YYYYMMDD

Michael F. Easley, Governor
William G. Boss Jr., Secretary
North Carolina Department of Environment and Natural Resources
December 19, 2008
Mr. Charles Horne
Horne Brothers Construction
1662 Middle River Loop
Fayetteville, NC 28312
Subject: Stormwater Permit No. SW6081105
West Mountain Drive Warehouse
High Density Commercial Wet Pond Project
Cumberland County
Dear Mr. Horne:
Colecn 11. Sullins, Director
Division of Water Quality
JAN 2 6 2039
Um
The Stormwater Permitting Unit received a complete Stormwater Management Permit
Application for West Mountain Drive on December 17, 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. SW6081105, dated December 19, 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 December 19, 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 Fayetteville Regional Office. If you have any
questions, or need additional information concerning this matter, please contact Cory
Larsen at [phone]; or [e-mail].
Sincerely,
fo�H. Sullins
cc: Fayetteville Regional Office
Central Files
SPU Files N�o7nhCarolina
North Carolina Division of Water Quality 1617 Mail Service Center Raleigh, NC 27699-1617 Phone [phone] Customer Service
Internet: www.ncwaterqualitv.ore Location: 512 N. Salisbury St. Raleigh, NC 27604 Fax [phone]
An Equal Opportunity/Affirmative Action Employer-100% Recycled/30% Post Consumer Paper
V

State Stormwater Permit
Permit No.SW6081105
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
Charles Horne / Horne Brothers Construction
West Mountain Drive Warehouse .
West Mountain Drive & US Hwy 301, Fayetteville, Cumberland 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
"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 December 19, 2018, and
shall be subject to the following specified conditions and limitations:
I. DESIGN STANDARDS
This permit is effective only with respect to the nature and volume of stormwater
described in the application and other supporting data.
This stormwater system has been approved for the management of stormwater
runoff as described in Section 1.6 on page 3 of this permit. The stormwater
control has been designed to handle the runoff from 122,839 square feet of
impervious area.
The tract will be limited to the amount of built -upon area indicated on page 3 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.SW6081105
The following design criteria have been provided in the wet detention pond and
must be maintained at design condition:
a. Drainage Area, acres: 3.88
Onsite, ft2: 314,175
Offsite, ft2: 3,349
b. Total Impervious Surfaces, ft2:
Buildings ft2:
Roads/Parking, ft2:
Other, ft2:
Offsite, ft2:
Future Development, ft2:
C. Pond Depth, feet:
d. TSS removal efficiency:
e. Design Storm:
f. Permanent Pool Elevation, FMSL:
g. Permitted Surface Area @PP ft2:
h. Permitted Storage Volume, ftj:
i. Storage Elevation, FMSL:
j. Controlling Orifice:
k. Permanent Pool Volume, ft3:
I. Forebay Volume, ft3:
m. Receiving Stream/River Basin:
n. Stream Index Number:
o. Classification of Water Body:
122,839
15,000
57,811
10,7699 (sidewalks)
39,258
3.1
90%
1.0 inch
493.83
11,868
22,079 at temporary pool
495.06
1.5" 0 pipe
37,076
7,834
UT of Blounts Creek / Cape Fear
18-27-5
„C„
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'm.inimum 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.
d. 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 approved plans and specifications, and other
Page 2 of 6

State Stormwater Permit
Permit No.SW6081105
supporting data.
Upon completion of construction, prior to issuance of a Certificate of Occupancy,
and prior to operation of this permitted facility, a certification must be received
from an appropriate designer for the system installed certifying that the permitted
facility has been installed in accordance with this permit, the approved plans and
specifications, and other supporting documentation. Any deviations from the
approved plans and specifications must be noted on the Certification. A
modification may be required for those deviations.
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
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
time as the Division approves the transfer request.
Page 3 of 6

State Stormwater Permit
Permit No.SW6081105
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.
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.
Permit issued this the 19'h day of December, 2008.
NORTH CAROLINA ENVIRONMENTAL MANAGEMENT COMMISSION
/or toieen ri. sunins, uirector
Division of Water Quality
By Authority of the Environmental Management Commission
Page 4 of 6

State Stormwater Permit
Permit No.SW6081105
West Mountain Drive Warehouse
Stormwater Permit No. SW6081105
Cumberland County
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,
West Mountain Drive Warehouse
(Project)
for (Project Owner) hereby state that, to the
best of my abilities, due care and diligence was used in the observation of the project
construction such that the construction was observed to be built within substantial
compliance and intent of the approved plans and specifications.
The checklist of items on page 2 of this form is included in the Certification.
Noted deviations from approved plans and specification:
Signature
Registration Number
Date
SEAL
Page 5 of 6

State Stormwater Permit
Permit No.SW6081105
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
225 Green Street
Systel Bldg. Suite 714
Fayetteville, NC 28301-5043
Page 6 of 6

Permit Number: & A 08 if or
(to be provided by D{VQ)
Drainage Area Number:_ l
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 }vet 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 -svet 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
detention basin
Areas of bare soil and/or
erosive gullies have formed.
Regrade the soil if necessary to
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
)roximately six inches.
Form SW401-Wet Detention Basin O&M-Rev.3 Page I of 4

Pennit Number:
(to be provided by DIVA)
Drainage Area Number:
BMP element:
Potentialproblem:
Iiow 1 will remediate theproblem:
The inlet device: pipe or
swale
The pipe is clogged.
Unclog the pipe. Dispose of the
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 hn 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
future erosion problems.
Weeds are present.
_prevent
Remove the weeds, preferably by
hand. If pesticide is used, wipe it on
the plants rather than spraying.
The vegetated shelf
Best professional practices
Prime 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.3 Page 2 of 4'

Pennit Number:
(to be provided by D1PQ)
Drainage Area Number:
BMP element:
Potentialproblem:
How 1 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.
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 5.5 feet in the main pond, the sediment
shall be removed.
When the permanent pool depth reads 5.5 feet in the forebay, the sediment
shall be removed.
Sediment Removal
Bottom
BASIN DIAGRAM
(fill in the blanks)
Permanent Pool Elevation 493.83
488.33 Pe manen Pool
----------- -- Volume Sediment Removal Elevation48-8.3-3 Volume
487.33 ftMin. ---------------- ------------- -----
Sediment Bottom Elevation 487.33 I I-ft 11
Storage Sedimer
Storage
FOREBAY MAIN POND
Form SW401-Wet Detention Basin O&M-Rev.3 Page 3 of 4

Permit Number:
(fo be provided b), DII'Q)
I acknowledge and agree by my signature below that I am responsible for the
performance ofthe 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.
Pr•gject nanie: West Mountain Drive Warehouse
BkIP drainage wren nnniber:I
Print nanle:Cllarles Horne
Title: partner -Horne Brothers Construction
Address:1662 Middle River Loon, Fayetteville NC 28312
Date: ///I& de? x
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 Iras been named the president.
a Notary Public for the State of
do hereby eertify that
i
personally appeared before me this
day of n `I r)li")eY �, and acknowledge the due execution of the
forgoing wet cletention basin maintenanc requirements. Witness my hand and official
seal, C.Ztii�,Y� %1�• �l'r�/e�"
t-1
Notary Public
Cumberland County
$Ioto of Norin Carolina
My Commleslon Expires Apr 1, 2012
SEAL
My commission expires 0p r i , �JiJI d)
T
Form SW401-wet Detention Basin O&M-Rev3 Page 4 of 4

DW.Q'USEbNLY _
Date Received
Fee Paid
Permit Number
?vEict. -
State of North Carolina 'l _._',_"` - - NO
Department of Environment and Natural Resources DEC j 7 200$
Division of Water Quality 1 L.--
DE R - NArE -
tiN,vtkalvf" rz QUALITY
STORMWATER MANAGEMENT PERMIT APPLICATIONRI "atarerancn
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):
Horne Brothers Construction
2. Print Owner/Signing Official's name and title (person legally responsible for facility and compliance):
Charles Horne - managing partner
3. Mailing Address for person listed in item 2 above:
City: Fayetteville State: NC Zip: 28312
Phone: ( 910 ) 489-2771 Fax: ( 910 ) 323-2354
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.):
West Mountain Drive Warehouse
5. Location of Project (street address):
828 LF west of intersection of W. Mountain Drive & US HWY 301 along W. Mountain Drive
City: Fayetteville County: Cumberland Zip: 28304
6. Directions to project (from nearest major intersection):
Go approximately 828 LF west on W. Mountain Drive from the intersection of US HWY 301 and
W. Mountain Drive towards Legion Road. Site will be on the north side of the road.
7. Latitude: 350 00' 49.1523" N Longitude: 780 53' 56.8814" W of project
8. Contact person who can answer questions about the project:
Name: Scott Brown Telephone Number: ( 910 ) 426-6777 ext. 102
Email: [e-mail]
II. PERMIT INFORMATION:
1. Specify whether project is (check one):
VIM
❑Renewal ❑Modification
FormSWU-101 Version02.19.08 Pagelof4

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 o'ect (check one):
❑Low Density h Density [:]Redevelop ®General Permit []Universal SMP ❑Other
4. Additional Proj uirements (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.
Storm water will be treated by a wet pond.
2. Stormwater runoff from this project drains to the Cape Fear River basin.
3. Total Property Area: 4.07 acres 4. Total Wetlands Area: 0 acres
5. 100' Wide Strip of Wetland Area: NA acres (not applicable if no wetlands exist on site)
6. Total Project Area**: 4.07 acres 7. Project Built Upon Area: 47.2
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.
Basrn Information ;: '�
Drainage Area 1 [
1Drauiage Area 2 ;•_;,°.
Receiving Stream Name
kT 8/&4 Af-.r C-t"4
-
Stream Class & Index No..
Class C &-38-(26)+
Total Drainage Area (so
168,949
On -site Drainage Area (so
165,600
Off -site Drainage Area (so
3,349
Existing Impervious* Area (so
0
Proposed Impervious*Area (so
122,839
% Impervious* Area (total)
72.7
Impervious Surface Area,;,
Dramgea Areal
.. ._-....
Dramage Area 2,
Pai.uk
On -site Buildings (so
15,000
On -site Streets (so
34,471
On -site Parking (so
23,340
On -site Sidewalks (so
10,769
Other on -site (so
39,258 (future development)
Off -site (so
0
Total (so:
122,839
* Impervious area is defined as the built upon area including, but not litnited 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).
Form SWU-101 Version 02.19.08 Page 2 of 4

10. How was the off -site impervious area listed above derived? Inclusive of the portion of
West Mountain Drive that will drain through the project area due to existingroad oad grades.
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 http://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 http://l12o.enr.state.nc.us/su/bml2 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 02.19.08 Page 3 of

Permit No.
fro be provided by DWQ)
Project name
Contact person
Phone number
Date
Drainage area number
DEC 1 7
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 (Pad III) must be printed, filled out and submitted along with all of the required information.
West Mountain Warehouse
Sceft Broom
II. DESIGN INFOftMAT10N � - -
Site Characteristics
Drainage area
Impervious area, post -development
% impervious
Design rainfall depth
Storage Volume: Non -SA Waters
Minimum volume required
Volume provided
Storage Volume: SA Waters
1.5" runoff volume
Pre -development 1-yr. 24-hr ru taff
Post -development 1-yr, 24-hr runoff
Minimum volume required
Volume provided
Peak Flow Calculations
Is the pre/post contml of the lyr 24hr stone peak flow required?
1-yr, 24-hr mintall depth
Rational C, pre -development
Rational C, post -development
Rainfall intensity: 1-yr, 24-hr stand
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
Elevations
Temporary pool elevation
Permanent pool elevation
SHWT elevation (approx. at the pen. pool elevation)
Top of 10ft vegetated shelf elevation
Bottom of 10ft vegetated shelf elevation
Sediment deanout, lop elevation (bottom of pond)
Sediment cleanout, bottom elevation
Sediment storage provided
Is there additional volume signed above the state -required temp. pool?
Elevation of the top of the additional volume
169,949 W
122,839 fC
72.71 %
1.0 in
9,859 fl' Insufficient required volume.
22,079 it' OK, volume provided is equal to or in excess of volume required.
y (Y or N)
3.0 in
0.35 (uniless)
0.79 (tintless)
0.13 inthr , OK
0.18 ft'/sec
0.40 ft'/sec
0.22 ft'/sec
495.06 fmsl
493.83 fmsl
487.34 fmsl
494.33 fmsl
493.33 fmsl Data not needed for calculation option pi, but OK if provided.
488.33 fmsl
487.33 fmsl Data not needed for calculation option #1, but OK if provided.
1.00 It
in (Y or N)
495.1 hnsl OK
Fond S W401-Wet Detengon Basin-Rev.S Parts I. 3 II. Design Summary, Page I of 2

Permit No.
(to be provided by DWQ
II! DESIGN
Surface Areas
Area, temporary pool
14,665 ft?
Area REQUIRED, permanent pool
11,826 ft
SAIDA ratio
7.00 (unitless)
Area PROVIDED, permanent pool, Ate, .
11,868 fe
OK
Area, bottom of ?Oft vegetated shelf, Am ,,,
9,673 ft`
Area, sediment cleanout, lop elevation (bottom of pond), Atv � o
2,352 fl`
Volumes
Volume, temporary pool
22,079 ft'
OK
Volume, permanent pool, Vce,,,,y,
37,076 ft'
Volume, forebay (sum of forebays if more than one forebay)
7,834 ft'
Forebay % of permanent pool volume
21.1 % %
OK
SAIDA Table Data
Design TSS removal
90 %
Coastal SAIDA Table Used?
y (Y or N)
Mountain/Piedmont SAIDA Table Used?
n (Y or N)
SAIDA ratio
7.00 (unitless)
Average depth (used in SAIDA table):
Calculation option 1 used? (See Figure 10-2b)
Y (Y or N)
Volume, permanent pool, Vo _Pw
37,076 fl'
OK
Area provided, permanent pool, A� _pw
11,868 it,
OK
Average depth calculated
3.12 ft
OK
Average depth used in SAIDA, d., (Round to nearest 0.5ft)
3.0 ft
OK
Calculation option 2 used? (See Figure 10-2b)
N (Y or N)
Area provided, permanent pool, Ar,,,,,yw
ft`
Area, bottom of 10ft vegetated shelf, A� a.a
fl`
Area, sediment cleanout, top elevation (bottom of pond), Ay ,,a
IF
"Depth" (distance b/w bottom of 1 Oft shelf and top of sediment)
It
Average depth calculated
It
Average depth used in SAIDA, dN, (Round to nearest 0.5ft)
it
Drawdown Calculations
Dmwdown through onfice?
Diameter of entice (it circular)
Area of orifice (If -non -circular)
Coefficient of discharge (Co)
Driving head (Ha)
Drawdown through weir?
Weir type
Coefficient of discharge (Q
Length of weir (L)
Driving head (H)
Pre -development 1-yr, 24-hr peak flow
Post -development 1-yr, 24-hr peak flow
Storage volume discharge rate (through discharge orifice or weir)
Storage volume dmwdown time
Additional Information
Vegetated 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 buildcul?
Drain mechanism for maintenance or emergencies
Y (Y or N)
1.50 in
in'
0.60 (unitless)
0.67 it
N (Y or N)
(unit ess)
(unitless)
it
it
0.18 ft'Isec OK
0.40 ft'/sec OK
0.06 ft/sec
OK, draws down in 2-5 days.
3.70 days Drawdown time varying from expected value by more than a half day.
Check calculation.
3 :1
OK
10 :1
OK
10.0 it
OK
3:1
OK
2.5 :1
OK
y (Y or N)
OK
ft
n (Y or N) OK
y (Y or N) OK
y (Y or N) OK
pump out
Form SW401-Wet Detention Basin-R.vs Parts I. & 11. Design Summary, Page 2 of 2