SW4090601_CURRENT PERMIT_20090923

STORMWATER DIVISION CODING SHEET
POST -CONSTRUCTION PERMITS
PERMIT NO.
SW1�D?&2l
DOC TYPE
� CURRENT PERMIT
❑ APPROVED PLANS
❑ HISTORICAL FILE
DOC DATE
YYYYMMDD

NCDENR
North Carolina Department of Environment and Natural Reso
Beverly Eaves Perdue
Division of Water Quality
Coleen K Sullins
Governor Director
August 19, 2009
Mr. Darrell Walker, Assistant Superintendent
Winston-Salem/Forsyth County Schools
1605 Miller Street
Winston-Salem, NC 27103
Subject: Stormwater Permit No. SW4090601
Walkertown High School
High Density Commercial Wet Pond Project
Forsyth County
Dear Mr. Walker:.
�V
RECEIVED
f; C. oent. of ENR
SEP 2 3 20M
W'mr<ton•Sal>m
roes Reglonsl0MC4
Dee Freeman
Secretary
The Stormwater Permitting. Unit received a complete Stormwater Management Permit
Application for Walkertown High School on August 11, 2009. Staff review of the plans and
specifications has determined that the pro .ct, as proposed, will comply with the Stormwater
Regulations set forth in Title 15A NCAC 21000 and Session Law 2006-246. We are forwarding
Permit No. SW4090601, dated August 19, 2009, for the construction, operation and
maintenance of the subject project and the stormwater BMPs.
This permit shall be effe'ctive.from the date of issuance until August 19, 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 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 Winston-Salem Reg ional.Office. If you have any questions,
or need additional information concerning this matter, please contact Brian Lowther at (919) 807-
6368; or [e-mail].
Sincerely,
>4­,�) Le-C V
for Coleen H. Sullins
cc: Winston Salem Regional Office
Central Files
SPU Files
Wetlands and Stormwater Branch
1617 Mail Service Center, Raleigh, North Carolina 27699-1617
Location: 512 N. Salisbury St. Raleigh, North Carolina 27604
Phone: [phone] FAX: [phone] Customer Service: 1-877-623-6748
inlemet: www.ncwaterquality.org
An Equal Opporlunilp 1 Affirmative Action Employer
One
North Carolina
Naturally

State Stormwater Permit
Permit No.SW4090601
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES
DIVISION OF WATER QUALITY
FAECGJVQD
k•Q. 06M. Of ENR
STATE STORMWATER MANAGEMENT PERMITSip 2 3 2009
Wl,mtunSa'em
HIGH DENSITY DEVELOPMENT aeoivn.i otnce
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
Winston-Salem/Forsyth County Schools
Walkertown Nigh School
5801.Sullivantown Road, Walkertown, Forsyth County
FOR THE
construction, operation and maintenance of a wet detention pond in compliance with
the provisions of 15A NCAC 2H .1000 and S.L. 2006-246 (hereafter referred to as the
"stormwatet 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 August 19, 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 3 of this permit. The stormwater
control for drainage area 1 has been designed to handle the runoff from 868,586
square feet of impervious area. The stormwater control for drainage area 2 has
been designed to handle the runoff from 435,600 square feet of impervious area.
3. 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.SW4090e0t,
6. The following design criteria have been provided in the wet detention pond and
must be maintained at design condition:
Drainage Area 1 Drainage
Area 2
a. .
Drainage Area, aQres:
42.03
'^ 30.9
Onsite, ft :
1,830,800
557,611.
Offsite, ft2:
.
0
0
b.
Total Impervioys Surfaces, ft2:
868,586
308,823
Buildings ft :
179,567
66.647
Roads/Parking, ft2.:
595,90
124,629
Other, ft2'
93,218,
47,963
Offsite, ft2:
0
0
c.
Pond Depth, feet:
5.5
4.96
d.
TSS.removal- efficiency:
90%
90%
e.
Design Storm:
1 inch
1 inch
f.
Permanent Pool Elevation, FMSL:
926.00
930.00
g.
Permitted Surface Area @PP
ft2: 50,245
27,048
h.
Permitted Storage Volume, ft�:
142,9.15
61,997 at
temporary pool
i.
Storage Elevation, FMSL:
928.50
932.00
j.
Controlling Orifice:
4.0" O pipe
3.5" O pipe
k.
Permanent Pool Volume, ft3:
283,301.0- -
116,103
I.
Forebay Volume, ft3:
56,628.0
24,101
m.
Receiving Stream/River Basin:
West Belews Creek
n.
Stream Index Number.
22-27-9-(1)
o.
Classification of Water Body:
"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 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.
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
Page 2 of 6

State Stormwater Permit
Permit No.SW4090601
shall become voidable unless the facilities are constructed in accordance with
the conditions of this permit, the approved plans and specifications, and other
supporting data.
6. Upon completion of construction, prior to issuance of a Certificate of Occupancy,
and prior to operation. of this permitted facility, a certification must be received
from an appropriate designer for the system installed certifying that the permitted
facility has been installed in accordance with this permit, the approved plans and
specifications, and other supporting documentation. Any deviations.from the
approved plans and specifications must be noted on the Certification. 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.
Page 3 of 6

State Stormwater Permit
Permit No.SW4090601-
2. The permittee is responsible for compliance with all permit conditions until such
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 maybe 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 requesorarmi pet modification, revocation and re -issuance or
termination does t fnot 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 191h day of August, 2009.
NORTH CAROLINA ENVIRONMENTAL MANAGEMENT COMMISSION
fof• C;oleen ti. 5umns, Uirector
Division of Water Quality
By Authority of the Environmental Management Commission
Page 4 of 6

State Stormwater Permit
Permit No.SW4090601
Walkertown High School
Stormwater Permit No. SW4090601
Forsyth County
Designer's Certification
as a duly registered
in the State of North Carolina, having been authorized to observe (periodically/ weekly/
full time) the construction of the project,
Walkertown High School
(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.SW4090601-
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 11.
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: Winston Salem Regional Office
Surface Water Protection
585 Waughtown Street
Winston Salem, NC 27107
Page 6 of 6

Permit No.
s•- , : _'�+� (to be provided by DWO)
y
NC®ENR Y
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 Ill) must be printed, filled out and submitted along with all of the required information.
0PROJE;CT•INF,ORMATIONOgI iF-ri Js: i RIG.. .`biEP'* i1Ei1 "# 5�6"- i5!'$• •� ,�. M.i',Y-t.ii.�f i� •r�Y, � a.�.il 1.
Project name Walkertown High School
Contact person Jay N. Guffey; PE
Phone number 336-886.4821
Date 6I19I2009 REVISED 7-29-09
Drainage area number 1
Site Characteristics
Drainage area
Impervious area, post -development
% impervious
Design ratafall 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 runoff
Post -development 1-yr, 24-hr runoff
Minimum volume required
Volume provided
Peak Flow Calculations
Is the pre/post controf of the lyr 24hr storm peak flow required?
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
Elevations
Temporary pool elevation
Permanent pool elevation
SHWT elevation (approx. at the perm. pool elevation)
Top of ?oft vegetated shelf elevation
Bottom of 100 vegetated shelf elevation
Sediment cleanout, top elevation (bottom of pond)
Sediment cleanout, bottom elevation
Sediment storage provided
Is there additional volume stored above the state -required temp. pool?
Elevation of the top of the additional volume
1;830,800 ft'
868,586- e
47.44 %
1.0 in
72,772 It
142,915 ft'
1 ft3
4
0 ft,
:N - •(YorN)
•,2.8 in
OK
OK, volume provided is equal to or in excess of volume required.
0.40 (unifless)
10.79 (unitless)
' ,0.12 inlhr OK
2.04 fl3isec
3.98 ft3lsec
1.94 ft3lsec
928:50 ' fmsl
1,926.00 frml
924.00 fmsl
'926,50 fmsl
<925'50 fmsl Data not needed for calculation option #1, but OK if provided.
919.00 fmsl
�917.00 fmsl Data not needed for calculation option #1, but OK if provided.
2.00 ft
'Y: (YorN)
928'5' fmsl OK
Form SW401-Wet Detention Basin-Rev.6-2120109 Parts I. & II. Design Summary, Page 1 of 2

Permit No. _
(to be provide, oy OJ✓QJ
-' 7'
fl!Si DESIGN I1NFOi2MATION�s �.fk����hi.rZ' Q
T�A�.7.
Surface Areas
Area, temporary pool 62,188 ft'
Area REQUIRED, permanent pool 33,870 ft'
SAIDA ratio 1.85 (unitless)
Area PROVIDED, permanent pool, Awm_m 50,245 ft` OK
Area, bottom of 10ft vegetated shelf. A,, wr 45,731 t °
Area, sediment cleanout, top elevation (bottom of pond), A,,,_,,, .34.436 ft'
Volumes
Volume, temporary pool
142,915 ft'
Volume, permanent pool, V,,m,cd
:283,301•e
Volume, forebay (sum of forebays if more than one forebay)
156,628 ft3
Forebay % of permanent pool volume
20.0% %
SAIDA Table Data
Design TSS removal
40'dk
Coastal SAIDA Table Used?
N (Y or N)
Mountain/Piedmont SAIDA Table Used?
Y (Y or N)
SAIDA ratio
1.85 (unitless)
Average depth (used in SAIDA table):
Calculation option 1 used? (See Figure 10-2b)
Y "(Y or N)
Volume, permanent pool, Vim,,—
'283;301. ft'
Area provided, permanent pool, A,L w
:50,245*
Average depth calculated
5.60'ft
Average depth used in SAIDA, d., (Round 10 nearest 0.5ft)
; 5.5 ft
Calculation ophon 2 used? (See Figure 10-2b)
N (Y or N)
Area provided, permanent pool, Ap,,,_pcd
ft` .
Area, bottom of 10ft vegetated shetf, A,.*,w
ftz
Area, sediment cleanout, top elevation (bottom of pond), A� ,
ftz
"Depth" (distance b/w bottom of 10ft shelf and top of sediment)
., ft
Average depth calculated
=•:: ft
Average depth used in SAIDA, d., (Round to nearest 0.511)
? ft
Drawdown Calculations
Drawdown through orifice?
Diameter of orifice (if circular)
Area of orifice (if-non-ircular)
Coefficient of discharge (Co)
Driving head (Ho)
Drawdown through weir?
Weir type
Coefficient of discharge (C.)
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 drawdown time
Add itiona l 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 build -out?
Drain mechanism for maintenance or emergencies
--4.00 in
.in2
.0.60 (uniless)
0.78 ft
'N :(YorN)
_ { (unitless)
(unitless)
ft
:2.04-ft3lsec
. • ,93.98 ft3lsec
'0.37 ft'fsec
' k'4:50.days
OK
(y
OK
OK
OK
OK
OK
OK
OK, draws down in 2-5 days.
Drawdown time varying from expected value by more than a half day.
3 :1
OK
`10 A
OK
10.0 ft
OK
:3 :1
OK
3.0 '.1
OK
Y
(Y or N)
OK
1.5 ft
OK
N ' .
­ - (Y or N)
OK
Y.
'-. :(YorN)
OK
•..Y_2..-(YorN)
OK
:Drain plug
Form SW401-Wet Detenlion Basin-Rev.e-2120109 Parts I. & II. Design Summary, Page 2 of 2

a
Permit No
(to be provided by DWQ)
Please indicate the page or plan sheet numbers where the supporting documentation can be found, -An incomplete submittal package will
result in a request for additional information. This will delay final review and approval of the project. Initial in the space provided to
indicate the following design requirements have been met. If the applicant has designated an agent, the agent may initial below. If a
requirement has not been met, attach justification.
Page/ Plan
Initials
Sheet -No.
W—
Sv�f P
1. Plans (1" - 50' or larger) of the entire site showing:
5la rm P �}
- Design at ultimate build -out,
4n1ur
pOff-site drainage (if applicable),
C I.1
eOelineated drainage basins (include Rational C coefficient per basin),
Aasin'dimensions,
Pretreatment system,
;-High (low bypass system,
,r-Maintenance access,
' ►Aght of waY.(RO M,
.*ernow device, and
ll /ranrtdariesoFdreiflege
G7
a -f
esseme�
�J
2. Partial plan (1" = 30' or larger) and details for the wet detention basin showing:
- Outlet structure with trash rack or similar,-
- Maintenance access, �-
- Permanent pool dimensions,
- Forebay and main pond with hardened emergency spillway,,-
- Basin cross-section,
- Vegetation specification for planting shelf, and
- Filter strip. /V/'J - ��4n/ �z,L `e)'i , r �Lmo✓Hc-
G
C/. C/
3. Section view of the wet detention basin (1" = 20' or larger) showing:
- Side slopes, 3:1 or lower,
Pretreatment and treatment areas, and
- Inlet and outlet structures.
4. If the basin is used for sediment and erosion control during construction, clean out of the basin is specified
on the plans prior to use as a wet detention basin.
C
1 5. A table of elevations, areas, incremental volumes & accumulated volumes for overall pond and for forebay,
to verify volume provided.
6. A construction sequence that shows how the wet detention basin will be protected from sediment until the
entire drainage area is stabilized.
7. The supporting calculations. -P? --v lc,��� �u�w� , -n 0 a
8, A copy of the signed and notarized operation and maintenance (0&M) agreement. jay, cw s�4f S �a.rn t n
9. A copy of the deed restrictions (if required).
_i I 61 10, A soils report that is based upon an actual field investigation, soil borings, and infiltration tests. County
soil maps are not an acceptable source of soils information.
•rTt�'Z
Form SW401-Wei Detention Basin-Rev.6-2120I09 Part III. Required Items Checklist, Page 1 or 1

Permit No,
(to be provided by TWO)
A .WWI
631274 _odor w a rF,gQG
y T
NCDENR
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATION APPLICATION FORM
WET DETENTION BASIN SUPPLEMENT
This form must be flied out, printed and submitted.
The Required Items Checklist (Part M) must be printed, fiffed out and submitted along with all of the required information.
t?VROJECTflNFORMAT ION x w '. r i " < ` a 'rs r 3ti- �6d? .: a �a?�' � ,'ors � g x i..;:fi c a FFti, if4
Project name +Walkertovvn High'School _.
Contact person Jay N`Guffey. PE
Phone number 336-886-4821
Date 19-Jun �t . 7_ zR _ Qr�
Drainage area number 4
IE'i]i;SIGN'INF.ORMATIONyq+"`'^ ' r v�; "� ' �'�o s e . tc n ,
.v,+ .�"°�. �rx �. %�xt3'. tx��.�s d r�.V« , 9..1a'sa �.. .,._.�,
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 runoff
Post -development 1-yr. 24-hr runoff
Minimum volume required
Volume provided
Peak Flow Calculations
Is the prelpost control of the 1yr 24hr storm peak flow required?
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
Elevations
Temporary pool elevation
Permanent pool elevation
SHWT elevation (approx. at the perm. pool elevation)
Top of 10ft vegetated shelf elevation
Bottom of 10ft vegetated shelf elevation
Sediment cleanout, top elevation (bottom of pond)
Sediment cleanout, bottom elevation
Sediment storage provided
Is there additional volume stored above the state -required temp, pool?
.Elevation of the top of the additional volume
:1,345,7861 flz
.435,600-ft
32,37 %
38,278& ft3 OK
61:997, ft3
OK, volume provided is equal to or in excess of volume required.
ft3
(Y or N)
2.8 in
'0.58 (unilless)
0.65 (unitless)
i0.12 inlhr OK
2.17 ft3lsec
2.41 ft3lsec
0.24 ft3/sec
93000' (msl
924'.00 fmsl
1930.50 fmsl
929:50' fmsl Data not needed for calculation option #1, but OK if provided.
924:00 r fmsl
922.00`fmsl Data not needed for calculation option #1, but OK it provided.
2.00 ft
Y (Y or N)
' 932.0 fmsl OK
Form SW401-Wet Detention Basin-Rev.19i2120109 Parts I. & it. Design Summary, Page 1 of 2

Permit No. r -
(to be provided by DWQ)
Surface Areas
Area, temporary pool
Area REQUIRED, permanent pool
SAIDA ratio
Area PROVIDED, permanent pool, Ap._p.,
Area, bottom of 1011 vegetated shelf, Ate, ,�a
Area, sediment cleanout, top elevation (bottom'of pond), A,,t_.,d
Volumes
Volume, temporary pool
Volume, permanent pool, V,,,,R,-P,,
Volume, forebay (sum of forebays if more than one forebay)
Forebay % of permanent pool volume
SAIDA Table Data
Design TSS removal
Coastal SAIDA Table Used?
Mountain[Piedmont SAIDA Table Used?
SAIDA ratio
Average depth (used in SAIDA table):
Calculation option 1 used? (See Figure 10-2b)
Volume, -permanent pool, Vp._p ,
Area provided, permanent pool, A ,,,,,,,d
Average depth calculated
Average depth used in SAIDA, d. (Round to nearest 0.511)
Calculation option 2 used? (See Figure 10-2b)
Area provided, permanent pool, Aim, d
Area, bottom of 1Oft vegetated shelf, Ab,�_,i1e1t
Area, sediment cleanout, top elevation (bottom of pond), Alpo„ a
"Depth" (distance b/w bottom of 1Oft shelf and top of sediment)
Average depth calculated
Average depth used in SAIDA, d. (Round to nearest 0.5ft)
Drawdown Calculations
Drawdown through orifice?
Diameter of orifice (if circular)
Area of orifice ('Ii-non-circular)
Coefficient of discharge (CD)
Driving head (Ho)
Drawdown through weir?
Weir type
Coefficient of discharge (CW)
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 orweir)
Storage volume drawdown time
Additional Information
33,771 ftZ
21,263 ft2 .
-1.58 (unitless)
27,048'ft` OK
.24,912 ft'
13,932; e
61,997.ft3 OK
' 116,103; f1J
124,101-ft3
20.8% % OK
90 %
N - ; (Y or N)
�Y (Y or N)
1.58 (unitess)
Y (Y or N)
1161103' ft3
:27,048'ft`
4:29 ft
N (Y or N)
'ft1
It
ft
It
,Y (Y or N)
3.50 in
'0.60 (unittess)
""0.62 ft
N -f-. ­ "(Y or N)
(unitless)
(unitless)
ft
-ft
217� ft3lsec
2A1: R31sec
"0.25; 01sec
;.:'2.87 days
OK
OK
OK
OK
OK
OK
OK, draws down in 2-5 days.
Drawdown time varying from expected value by more than a half day.
Vegetated side slopes
:3 :1
OK
Vegetated shelf slope
"10 :1
OK
Vegetated shelf width
10.0 ft
OK
Length of flowpath to width ratio
-3 a
OK
Length to width ratio
.
=3A :1
OK
Trash_ rack for overflow & orifice?
"Y •
-", . (Y or N)
OK
Freeboard provided
1.0 ft
OK
Vegetated filter provided?
. N
: (Y or N)
OK
Recorded drainage easement provided?
;Y. r
C : ', (Y or N)
OK
Capures all runoff at ultimate build -out?
IN .
". ' ' (Y or N)
OK
Drain mechanism for maintenance or emergencies
Drain plug
'
Form SW401-Wet Detention Basin-Rev.6-2/20109
Parts I. & II. Design Summary, Page 2 of 2

Permit No
(to be provided by DWO)
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.
ti
1�
1. Plans (V - 50' or larger) of the entire site showing:
-.Design at ultimate build -out,
er? r!617- d
--Cff--site drainage (if applicable),
--D61ineated drainage basins (include Rational C coefficient per basin),
:Basin dimensions,
--Pretreatment system,
—High flow bypass system,
=-Maintenance access,
P.reposed-drainage-easementand-public right -of -way -(ROW),
. Overflow device, and
_Bouadaries of=drainage:_easament.
Z
2. Partial plan (1" = 30' or larger) and details for the wet detention basin showing,
- Outlet structure with trash rack or similar,
Maintenance access,
- Permanent pool dimensions,
Forebay and main pond with hardened emergency spillway,
Basin cross-section,
-Vegetation specification for planting shelf, and
- Filter strip.
J ) Z 3. Section view of the wet detention basin (1" = 20' or larger) showing:
- Side slopes, 3:1 or lower,
- Pretreatment and treatment areas, and
- Inlet and outlet structures.
Z f 4. If the basin is used for sediment and erosion control during construction, clean out of the basin is specified
on the plans prior to use as a wet detention basin,
5. A table of elevations, areas, incremental volumes & accumulated volumes for overall pond and for forebay,
to verify volume provided.
6. A construction sequence that shows how the wet detention basin will be protected from sediment until the
entire drainage area is stabilized.
J 7. The supporting calculations.
8, A copy of the signed and notarized operation and maintenance (O&M) agreement.
9. A copy of the deed restrictions (if required).
10. A soils report that is based upon an actual field investigation, soil borings, and infiltration tests. County
soil maps are not an acceptable source of soils information.
Form SW401-Wet Detention Basin-Rev.6-2120109 Part III. Required Items Checklist, Page 1 of 1

Permit Number:
(io be provided by DIYQ)
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
This system (check one):
❑ does ® does not
incorporate a vegetated filter at the outlet.
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 DTVQ)
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
revent 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.
I
Form SW401-Wet Detention Basin O&M-Rev.4 Page 2 of 4

Permit Number:
(to be provided by DfVQ)
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 a licable
The outlet device
Ciogging has occurred.
Clean out the outlet device. Dispose
of the sediment off -site.
The outlet device is dama ed
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. 4�
When the permanent pool depth reads 7 feet in the main pond, the.sediment
shall be removed. d
When the permanent pool depth reads 7 feet in the forebay, the sediment shall
be removed.
BASIN DIAGRAM
(fill in the blanks)
0 Permanent Pool Elevation 926
Sediment Removal Iv . 919 Pe ianen Pool
- - - - - - - - - - - - - - Volume Sediment Removal Elevation 919 volume
Bottom 'levatio 917 -ft Min.
-------------------------- ---------------- ---- Wr
Sediment Bottom Elevation 917 1-ft
Storage Sediniei
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:Walkertown High School
BMP drainage area number: I
Print name:Darrell Walker
Title:Assistant Superintendent _
Address:1605 Miller Street, Winston-Salem NC 27107
Phone:336_-IZ7=2533
Signature:- -t. 6, .-U c,_
Date: 116
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.
I, �,C' ✓ 1►� , a Notary Public for the State of
. Yo U nI71—_, County of , do hereby certify that
�IJQY re l L��g�j +�Y personally appeared before me this
day of n 4 _[.._, and acknowledge the due execution of the
forgoing wet detention basin maintenance requirements. Witness my hand and official
seal,
SEAL
My commission expires
u
e
Form SW401-Wet Detention Basin O&M-Rev.4
Page 4 of 4

Permit Number:
(to be provided by 1)WQ)
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
This system (check one):
❑ does ® does not
incorporate a vegetated filter at the outlet.
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 Ioad 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:
Potential problem::-
How I will remediate theproblem:
The entire BMP
Trash/debris is pr6ent.
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 Iime and a
one-time fertilizer application.
Vegetation is too short or too
Maintain vegetation at a height of
long.
approximatel six inches.
Form SW40I-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 1 will remediate the roblem:
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 21ants 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 1

Permit Number:
(to be provided by DfVQ)
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. (q2pplicable
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 penetir tt< into,' f
accumulated sediments.
When the permanent pool depth reads 6 feet in the main pond; the -sediment
shall be removed.
When the permanent pool depth reads 6 feet in the forebay, the sediment shall
be removed.
BASIN DIAGRAM
(fill in the blanks)
0 Pennanent Pool Elevation 930
Sediment Removal .924 Pe anen Pool
- --- - - - - - - - - - - - - - - Volume Sediment Removal Elevation 924 Volume
Bottom Elevatio 922 -ft Min.
------------------------------ ------------ ------
Sediment Bottom Elevation 922 1-ft r
Storage Sedimei
Storage
FOREBAY MAIN POND
Form SW401-Wet Detention Basin O&M-Rev.4 Page 3 of 4

Permit Number:
(to be provided by DihQ)
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:Walkertown High School
BMP drainage area number :2
Print name -.Darrell Walker '
Title:Assistant Superintendent
Address:1605 Miller Street, Winston-Salem, NC 27107
PhnnP•��F,_777_75�� a
Signature:'--*,--�
Date: — j .G
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.
a Notary Public for the State of
l..a,_County of 1 do hereby certify that
personally appeared before me this l
day of _�J ",n P_ ,and acknowledge the due execution of the
forgoing wet. detention basin maintenance requirements. Witness my hand and official
seal,
SEAL
My commission expires 9!f)3 " -DES ^ i I
i
i
Form SW40I-Wet Detention Basin O&M-Rev.4
Page 4 of 4

DAMS • MARTIN • POWELL
ENGINEERS & SURVEYORS RECEIVED
KC.Dept. of ENR
SEP 2 4 2012
Winston-Salem
TRANSMITTAL I Regional Office
Date: September 14, 2012
To: Sue Homewood
Winston Salem Regional Office
Surface Water Protection
585 Waughtown Street
Hand Delivery by JNG
We are sending you attached the following items:
Imp
Re: Walker -town High School
State Stormwater Permit SW4090601
DMP Job No. 080139
❑ Shop Drawings
❑
Samples
❑
Copy of Letter
❑ Prints
❑
Specifications
®
Other
❑ Plans
❑
Disk
❑
Change Order
# Copies
Drawing #
Description
Disposition
Final Stormwater Certification
Remarks:
By:
Aj'L---
Jay . Guffey, PE
c: File
1336-886-4821 1 F:336-886-4458 1 www.dmp-inc.com
6415 Old Plank Road, High Point, NC 27265

Walkertown High School
Stormwater Permit No. SW4090601
Forsyth County
Designer's Certification
State Stormwater Permit
Permit No.SW4090601
RECEIVED
N.C.Dept. of ENR
a
SEP 2 4 2012 `,ry
Winston-Salem
Regional office
I, Ja44 N. (� o-FP6 , as a duly registered lwe% H
in the State of North Carolina having been authorized to observe J32rlo Ica / weekly/
full time) the construction of the project,
Walkertown High School
(Project)
..................�o.,.,�...__..._.........___.�.........................._._.._........_......._........_...._..._...._.
for s�n�.+-SAtQ��a,ts.7ri_ ( _.._.......__......._......
S �►�� a �s Project Owner) hereby state that, to the
best of my abilities, due care and dill ence 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:
SEAL
Signature
Registration N mbar '33 $80
Date Z0}Z-
Page 5 of 6

c

State Stormwater Permit
Permit No.SW4090601
Certification Requirements'.
1.
The drainage area to the system contains approximately the permitted
acreage.
JAL2 2.
The drainage area to the system contains no more than the permitted
amount of built -upon area.
J_3.
All the built -upon area associated with the project is graded such that the
runoff drains to the system.
J�A 4.
All roof drains are located such that the runoff is directed into the system.
J�5.
The outlet/bypass structure elevations are per the approved plan.
J&_6.
The outlet structure is located per the approved plans.
_._._._... _... _.._....__........-_
Jv4k 7. Trash rack is provided on the outlet/bypass structure.
.... Q4_8. All slopes are grassed with permanent vegetation.
�1�9. Vegetated slopes are no steeper than 3:1.
U %Jb_10. The inlets are located per the approved plans and do not cause short-
circuiting of the system.
Ja&, 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.
Jklq 14. All required parts of the system are provided, such as a vegetated shelf,
and a forebay.
J`LC 15. The required system dimensions are provided per the approved plans.
Please submit this Designer's Certification to: Winston Salem Regional Office
Surface Water Protection
585 Waughtown Street
Winston Salem, NC 27107
Page 6 of 6

.-,:,.., .,•,�_� ,'�a: yx 1 _ ' � .., :'' �"`I�WQi}SE•-.ONLY •, xyt ,; , � �:.^- �� � .. *.r ra
Z i; t hX
Date Receiv d
Fee Paid
Permit Number
169
S05
5W a o6a
State of North Carolina
Department of Environment and Natural Resources
Division of Water Quality
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
This forty rimy be photocopier[ for use as an original
1. GENERAL INFORMATION
I. Applicants name (specify the name of the corporation, individual, etc. who owns the project):
Winston-Salem/Forsyth County Schools _
2. Print Owner/Signing Official's name and title (person legally responsible for facility and compliance):
Darrell Walker, Assistant Superintendent
_3._- Maiiing_Address for person listed in item .2_above:
1605 Miller Street
City: Winston-Salem State:NC Zip:27103
Phone: j336 ) 727-2816 Fax: i336_ )_ 727-8404 -
Email:
4. Project Name (subdivision, facility, or establishment name - should be consistent with project name on plans,
specifications, letters, operation and maintenance agreements, etc.):
Walkertown High School
5. Location of Project (street address):
5801 SulIivantown Road
City:WaIkertown County:Forsyth Zip:27051
6. Directions to project (from nearest major intersection):
Approx. 0.75 mile from the intersection of I-Ihy 66 and Hwy 158 , turn right on Main Street, 0_50 mile turn
right on_Sullivantown Road, Site is 0.4 miles on the right _
7. Latitude:360 10' 36" N
Longitude:-80° 09"53" W of project
8. Contact person who can answer questions about the project: .
Name:Bill Powell Telephone Number: (336 ) 727-2533
Email:bp: wellQadmin.wsfcs.kl2.nc.us
II. PERMIT INFORMATION:
1. Specify whether project is (check one)
®New
❑Renewal ❑Modification
Fonn SWU-101 Version 09 25.08 Page] of4

r
I
s
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 q
4. Additional Project Requirements (check applicable blanks; information on required state permits can be I
obtained by contacting the Customer Service Center at 1-877-623-6748): !
❑LAMA Major ®Sedimentation/Erosion Control Z404/401 Permit ❑NPDES Industrial Stormwater i
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.
The majority of the new impervious areas will be captured and treated. The new impervious area that can not be
captured and treated will be traded out for capturing and treating an equal or greater amount of exsiting
impervious areas
2. Stormwater runoff from this project drains to the Roanoke River basin.
3. Total Property Area: 9922 acres 4. Total Coastal Wetlands Area: 0 acres
a. Total Property Area (3) -- Total Coastal Wetlands Area (4) = Total Project Area**:9922 acres
6. (Total Impervious Area / Total Project Area) X 100 =,Project Built Upon Area (BUA):
7. How many drainage areas does the project have? `I
8. Complete the following information for each drainage area. If there are more than two drainage areas in the
project, attach an additional sheet with the information for each area provided in the same format as below.
For high density projects, complete the table with one drainage area for each engineered stormwater device.
�Basrn"Infoririation���i
�:,r,�,..a� ,n •x.,.x<5 ..,,,�,x. h� �
Y�� 9
��.; . � �Dramageal�.
Receiving Stream Name
SEE ATTACHED
Stream Class & Index No.
Total Drainage Area (so
On -site Drainage Area (so
Off -site Drainage Area (so
Existing Impervious* Area (so
Proposed Impervious*Area (sf)
% Impervious* Area (total)
IxxlpervaousfSuface,A�'ea�?�;Drnage
*.v , a rM- ms ,;i •,rzb r,
Area��w*s;
s i'" n; § 2
Dr�nage Areaz
On-site Buildings (so
On -site Streets (SO
On -site Parking (so
On -site Sidewalks (so
Other on -site (so
Off -site (so
Total (so:
* 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 to exclude Coastal Wetlands frotu use'when calculating t1w built upon area
percentage calculation. This is the area used to calculate overall percent project built upon area (BUA).
Form SWU-101 Version 09.25.08 Page 2 of 4

9. ' How was the off -site impervious area listed above derived? aerial photography and the geo-data explorer
from Forsyth County GIS cle.parEment .
Projects in Union County: Contact the DWQ Central Office staff to check to see if you project is located
within a Threatened & Endangered Species watershed that may be subject to more stringent stormwater
requirements. '
IV. DEED RESTRICTIONS AND PROTECTIVE COVENANTS
One of the 41%'rng property restrictions and protective covenants are required to be recorded for all
subdivisions, Oui�iarcels 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 �4VZiloaded from httl2://h2o.enr.state.nc.us/su/bmp forms.htm - deed restrictions.
Form DRPC-1;� �q;� High Density Commercial Subdivisions
Form DRPC-2: 4,i•r�• High Density Developments with Outparcels
Form DRPC-3 `1; High Density Residential Subdivisions
Form DRPC-4 �± ;.�� Low Density Commercial Subdivisions
Form DRPC-5 Low Density Residential Subdivisions
Form DRPC-6 Low Density Residential Subdivisions with Curb Outlets
_By-your.signature.below,-you certify- that the. recorded property restrictions and_protective.covenants for. this
project 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 NC DWQ 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 Permitting Unit at [phone] for the status and
availability of these forms. forms can be downloaded from http:jjh2o.enr.state.nc.us/su[bmp forms.htm.
Form SW401-Low Density
Low Density Supplement
Form SW401.-Curb Outlet System
Curb Outlet System Supplement
Form SW401-Off-Site System
Off -Site System Supplement
Form SW401-Wet Detention Basin
Wet Detention Basin Supplement
Form SW401-Infiltration Basin
Infiltration Basin Supplement
Form SW401-Infiltration Trench
Underground Infiltration Trench Supplement
Form SW401-Bioretention Cell
Bioretention Cell Supplement
Form SW401-Level Spreader
Level Spreader/Filter Strip/Restored Riparian Buffer Supplement
Form SW401.-Wetland
Constructed Wetland Supplement
Form SW401-Grassed Swale
Grassed Swale Supplement
Form SW401-Sand Filter
Sand Filter Supplement
Form SW401-Permeable Pavement
Permeable Pavement Supplement
Form SW401-Cistern
Cistern Supplement
Form SWU-101 Version 09.25.08 Page 3 of

VI. SUBMITTAL REQUIREMENTS
f
. r
Only complete application packages will be accepted and reviewed by the Division of Water Quality (DWQ)
A complete package includes all of the items Iisted 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 htt ://h2o.enr.state.nc.usisuimsi ma )s.htm)
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
�Ini
�t�als
• Original and one copy of the Deed Restrictions & Protective Covenants Form (if
required as per Part IV above)
3µ�
• Original of the applicable Supplement Form(s) and O&M agreement(s) for each BMP
• Permit application processing fee of $505 (Express: $4,000 for HD, $2,000 for LD)
Zo4q
payable to NCDENR
• Calculations & detailed narrative description of stormwater treatment/management V9
• Copy of any applicable soils report
• Two copies of plans and specifications (sealed, signed & dated), including:
- Development/Project name
- Engineer and firm
- Legend
- North arrow
----- Scale
- Revision number & date
- Mean high water line
- Dimensioned property/project boundary
- Location map with named streets or NCSR numbers
- Original contours, proposed contours, spot elevations, finished floor elevations
- Details of roads, drainage features, collection systems, and stormwater control measures
- Wetlands delineated, or a 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 (such as additional information requests), please complete this section. (ex, designing engineer or firm)
Designated agent (individual or firm):
Mailing Address.
City:
Phone:
Email:
VIII. APPLICANT'S CERTIFICATION
State: Zip:
Fax: ( )
1, (print or hype name of person listed in General Information, item 2) Darrell Walker
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 2H —+000.
Signa
Date: �t b
Form SWU-101 Version 09.25.08 Page 4 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 hap: //h2o.enr.state. nc.usisuimsi maps.litm)
1. 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
• 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
• Permit application processing fee of $505 (Express: $4,000 for HD, $2,000 for LD)
payable to NCDENR
• Calculations & detailed narrative description of stormwater treatment/management
• Copy of any applicable soils report
• Two copies of plans and specifications (sealed, signed & dated), including:
- Development/Project name
- Engineer and firm
-Legend
- North arrow
------
- 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 (such as additional information requests), please complete this section. (ex. designing engineer or firm)
Designated agent (individual or firm):Davis-Ma rtin-Powell & Associates ATTN: lay N. Guffey, PE
Mailing Address:6415 Old Plank Road
City:High Point _ State:NC Zip:27265
Phone: (336 ) 886-4821 Fax: [phone]
Emajl:.i&[e-mail]
VIII. APPLICANT'S CERTIFICATION
I, (print or hype name of person listed in General Information, item 2) Darrell Walker
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 2H .1000.
Signature: Date:
Form SWU-101 Version 09.25.08 Page 4 of 4

BMinElnfor''matiori :: #<
Draina-eiA�ea 1 r�
Draifidgb &6 2;' ��S�-�
Receiving Stream Name
West Belews Creek
West-Belews Creek
Stream Class & Index No.
Class C, 22-27-9- 1
Class C,.22-27-9- 1
Total Drainage Area sf
42.03 AC = 1,830,800 SF
12.80 AC = 557,611 SF
On -site Drainage Area sf
42.03 AC = 1,830,800 SF
12.80 AC = 557,611 SF
Off -site Drainage Area (sfl
0.00 AC = 0.00 SF
0.00 AC = 0.00 SF
Existing Impervious Area sf
0.00 AC = 0.00 SF
0.00 AC = 0.00 SF
Proposed Impervious Area (so
19.94 AC = 868,586 SF
0.97 AC = 42,405 SF
% Impervious Area total
47.48%
7.58%
Im "efvioi s SucFaceYArea ' "� ,,
Draina'ebArsa ls, �WMM f
EVZI�ODTAna e Area 2
On -Site Buildings sf
4.12 AC = 179,467 SF
0,00 AC = 0.00 SF
On -Site Streets s
2.61 AC = 113,692 SF
0.00 AC = 0.00 SF
On -Site Parkin (sf)
8.54 AC = 372,002 SF
0.00 AC = 0.00 SF
On -Site Sidewalks (so
2.53 AC = 110,207 SF
0.97 AC = 42,405 SF
Other On -Site sf
2.14 AC = 93,218 SF
0.00 AC = 0.00 SF
Off -Sites
0.00 AC = 0.00 SF
0.00 AC = 0.00 SF
Total (so
19.94 AC = 868,586 SF
0.97 AC = 42,405 SF
Receiving -Stream-Name -
West-Belews Creek-- -- µ-
West- Belews-Creek--- - -
Stream Class & Index No.
Class C, 22-27-9- 1
Class C, 22-27-9- 1
Total Drainage Area (so
34.6 AC = 1,506,858 SF
30.9 AC = 1,345,786 SF
On -site Drainage Area sf
5.28 AC = 230,315 SF
22.50 AC = 980,100 SF
Off -site Drainage Area (sn
29.32 AC = 1,277,179 SF
8.40 AC = 365,904 SF
Existing Impervious Areas
7.32 AC = 318,807 SF
5.80 AC = 252,648 SF
Proposed Impervious Area (so
0.32 AC = 13,850 SF
1:29 AC = 56,175 SF
% Impervious Area total
22.08%
22.97%
Im" ervious.Surface Area
Draina"er;4reay3 u�� '`
Draina e Area 4 ' E^�
On -Site Buildings (sf)
2.37 AC=103,436 SF
1.53 AC = 66,647SF
On -Site Streets (sf)
0.60 AC = 40,081 SF
1.27 AC = 55,369 SF
On -Site Parking (sq
2.31 AC = 100451 SF
1.59 AC = 69.260 SF
On -Site Sidewalks (sf)
0.52 AC = 22,852 SF
1.10 AC = 47,963 SF
Other On -Sites
0.26 AC = 11,251 SF
0.00 AC = 0.00 SF
Off -Site sf
1.25 AC = 54,496 SF
1.60 AC = 69,584 SF
Total (sf):
7.64 AC = 332,657 SF
7.09 AC = 308,823 SF

4
Walkertown High School
Storm Water Narrative Report
(Revised July 30, 2009)
The site of the proposed Walkertown High School is 5801 Sullivantown Road in Walkertown in northern
Forsyth County. The total site area is 99.22 acres which includes the existing Walkertown Elementary
and Walkertown Middle School. The disturbed area for the project is approximately 63 acres. This
project is a high density project due to the impervious areas exceeding 24% and extensive use of a
stormwater piping system. The stormwater will be collected and treated by 2 permanent ponds on site.
Both ponds are designed to remove 90% Total Suspended Solids. The total impervious area added to the
site is 22.52 acres. All of the proposed impervious surfaces will be treated with the exception of
approximately 2.62 acres in Pond 1. Pond 2 treats a total of 7.09 acres of impervious areas, of which 1.29
acres is proposed and 5.80 acres of existing impervious. The result is a site with 22.52 acres of
impervious area proposed and 27.03 acres of impervious being treated. Pond 2 is designed for a
maximum impervious area of 10 acres. With the net increase of existing impervious areas being treated
by Pond 2, (4.51 ac), ,and the over design of Pond 2, to have 10 acres of impervious drainage area, the
ability to treat 7.23 acres of impervious areas is achieved.
Permits have been applied for from The Anny Corps of Engineers and The NC Division of Water Quality
for the wetland impacts on site. The Pre -Construction Notification form for the project is included for
reference. Erosion Control is being reviewed by the NC Division of Land Quality, Winston-Salem
Regional Office. Permits have not been issued but are in the process of being reviewed.
There are 5 pre -development drainage sub -basins and 4 post -development drainage sub -basins. The post
development sub -basins are described below.
Basin
1D
Drainage
Area
(Acres)
Existing
Impervious
Area
(Acres)
Existing '
lmpervious
Removed
(Acres)
Proposed
Impervious
Area
(Acres)
Total
Impervious
Area
(Acres)
Final
Percent
Impervious
1
42.03
0.00
0.00
19.94
19.94
47.48
2
12.8
0.00
0.00
0.97
0.97
7.58
3
34.6
7.32
0.00
0.32
7.64
22.08
4
309
5.80
0.29
1.29
7.09
22.97
Pernanent Wet Detention Pond #1 treating sub -basin #1 treats the bulk of the proposed impervious area.
A total of 22.52 acres of impervious area is proposed and Pond #1 treats 19.94 acres of the 22.52.
Permanent Wet Detention Pond #2 treating sub -basin #4 treats a total of 7.09 acres of existing; and
proposed impervious area and is designed for a maximum build out of 10 acres of impervious area
draining to the pond. The net gain in impervious being treated, (4.51 acres) and the over design of
Permanent Pond #2 (2.81 acres) this provides the ability to treat 7.32 more acres of impervious than
proposed.
Attached are the design calculations for and supplemental sheets for each proposed permanent stonn
water device.