20051978 Ver 3_More Info Received_20080422

ENV
C6 - I R I S Y-3
Consu Services Inc.
643 Green Way Road
Suite K-3
Boone, NC 28607
Ph: 828-264-888o
Fx: 828-264-889o
April 18, 2008
Ms. Cyndi Karoly
Division of Water Quality
401/ Wetlands Unit
2321 Crabtree Blvd., Suite 250
Raleigh, NC 27604
RE: Shuford Development
Transmitted with this letter are 2 copies of the revised stormwater plan for the Shuford
Development project per request in attached letter from Robert Krebs to John Sigmon
dated March 30, 2008.. The contact for this application is John Sigmon, 828-328-2141.
ENV Inc. is the consultant for this project, could you please copy us on any
correspondence with the applicant.
If you have any questions regarding this application please contact us at 828-264-8880.
Sincerely,
John Vilas
President, ENV Environmental Consulting Services, Inc.
Cc: John Sigmon
Shad Walters
ENV-ECS, Inc.
;','??~'3S Fes,;} qo?4?
5.
AP
DEN 'j ? .
APR. 2.2008 7:42AM TREASURE N0.369 P. 1/1
a0F ,, A r R rvnehaol F. naaivy .i
Q Wjai= G. Ross Jr S
01 0 North Carolina Department Of Environment and N
> -i Colleen H. Sull
Q Division of W
March 3 ,
DWQ Project ##05-197P *t- 3
CERTU ED MAIL
RETURN RECETI'T REpIJESTEA
70071490 0004 4505 8091
Mr. John Sigmou
Shuford Development, Inc.
1995 Tate Blvd. SE
Hickory, NC 28603
REQUEST FOR MORE INFORMATION
Dear Mr. Sigmon:
The Division of Water Quality (DWQ) received y lication for a 401 Water Quality Certifici
the subject project on February 21, 2008- Your applic en reviewed, and based on the reviei
following imfornr tiou/cormmtents are needed:
Please submit the Required Items Checklists for each of the propos eL Detention Ponds and a]
the associated required items,
Pursuant to 15A NCAC 2H.0507(h) this project will be put on hold until such time as the request
information has been received. In addition, this office is requesting that the Army Corps of Engineers
pzocessing the 404 permit until the requested information is provided.
Please Send two copies Of the required information to Cyndi Karoly at the 401 Oversight and Expz s
Permits Unit by May 30, 2008, addressing the above issues. Failure to provide the requestedin£ormati n the
- --4,emen ionett data-, "y-rcs"It smtb& appl?ation? ing retunied as iRco ?--- ?ymha -e-aw - e
please contact Ms. Annette Lucas in Raleigh at [phone] or Mr. Barry Love of [phone].
Sincerely,
Robert B. Krebs
Regional Supervisor
Surface Water Protection
cc: Corps of Engineers-Asheville Office
Ian McMillan - Wetlands Unit
Central Files
John Vilas - ENV
Division of Water Quality Phone [phone] Customer Sf
Mooresville Regional Office
IYUernct: wa+w.ncwattr.?ljtyo? 610 East Cemer Ave, Suite 301 Mooresville, NC 2811$ 'Fax [phone] I-877-623
An Equal opportunitylAffirmative Action Employer- 50% Ro ydedl10% Post Consurnar Paper
1 West Basin
Permit No. DS -14018 Y 3
(to be provided by DWQ)
III. REQUIRED ITEMS CHECKLIST
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.
AC SW1 1. Plans (1" 50' or larger) of the entire site showing:
' Design at ultimate build-out,
Off-site drainage (if applicable),
Delineated drainage basins (include Rational C coefficient per basin),
Basin dimensions,
Pretreatment system,
- High flow bypass system,
Maintenance access,
' Recorded drainage easement and public right of way (ROW),
Overflow device, and
Boundaries of drainage easement.
AC SW2 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.
AC SW2 3. Section view of the dry detention basin (1" = 20' or larger) showing:
Side slopes, 3:1 or lower,
' Pretreatment and treatment areas, and
Inlet and outlet structures.
AC SW1 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.
AC SW1, SW2 5. A table of elevations, areas, incremental volumes & accumulated volumes for overall pond and for forebay,
to verify volume provided.
' AC SW1 6. An assurance that the installed system will meet design specifications upon initial operation once the
project is complete and the entire drainage area is stabilized.
AC SW1 7. A construction sequence that shows how the wet detention basin will be protected from sediment until the
' entire drainage area is stabilized.

' AC
AC 6,7,8
12,13,14,15 8. The supporting calculations.
9. A copy of the signed and notarized inspection and maintenance (I&M) agreement. k?5 Ll1 {?.;.
AC Not Applicable 10. A copy of the deed restriction. APR

KtETI ANDS?4ND STRRA
A,1TEil S
im CN,
Form SW401-Wet Detention Basin-Rev. 1 Part III. Required Items Checklist, Page 1 of 1

Permit No.
' East Basin (to be provided byDWQ)
111. REQUIRED ITEMS CHECKLIST
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.
AC SW1 1. Plans (1" 50' or larger) of the entire site showing:
Design at ultimate build-out,
Off-site drainage (if applicable),
Delineated drainage basins (include Rational C coefficient per basin),
Basin dimensions,
Pretreatment system,
High flow bypass system,
- Maintenance access,
Recorded drainage easement and public right of way (ROW),
Overflow device, and
Boundaries of drainage easement.
AC SW2 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.
AC SW2 3. Section view of the dry detention basin (1" = 20' or larger) showing:
Side slopes, 3:1 or lower,
Pretreatment and treatment areas, and
Inlet and outlet structures.
AC SW1 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.
AC SW1,SW2 5. A table of elevations, areas, incremental volumes & accumulated volumes for overall pond and for forebay,
to verify volume provided.
AC SW1 6. An assurance that the installed system will meet design specifications upon initial operation once the
project is complete and the entire drainage area is stabilized.
AC SW1 7. A construction sequence that shows how the wet detention basin will be protected from sediment until the
entire drainage area is stabilized.
AC 17,18,19 8. The supporting calculations.
AC 23,24,25,26 9. A copy of the signed and notarized inspection and maintenance (I&M) agreement.
AC Not Applicable 10. A copy of the deed restriction.
Form SW401-Wet Detention Basin-Rev.1 Part III. Required Items Checklist, Page 1 of 1
Shuford Development
' Hickory, North Carolina
Contact: John Sigmon
Stormwater Management Plan
Pre-development there are no existing impervious surfaces for this site. Based on the
proposed development plans the following calculations for two wet detention basin are
' designed for at least 85% TSS removal for the applicable proposed impervious surfaces.
The basins are designed to treat runoff from the ultimate build-out, no stormwater will be
treated from off-site, the roads around the site are curb and gutter and do not discharge
' runoff onto this site. The developed site will have a total impervious cover of 139,827
square feet, with total drainage to the designed basins being 311,606 square feet.

1

11

The West Basin will treat water from the West Drainage; this water will be
collected through pipes under the parking lot to collect parking lot and roof top
runoff. This runoff will be directed to a single pipe and directed to the West
Stormwater Basin. Stormwater West Basin was calculated with 85% TSS
removal. The wet detention basin will be supplemented with a level spreader and
a 30' wide vegetated filter. There is at least a 30' vegetative buffer between this
basin and any live streams. The anticipated seasonal high water table for this
basin at approximately 930 ft above sea level.
Basin Dimensions SA s ft Volume cu ft Cum. Vol. Dimensions ft Av. Depth
Sediment Storage 1
Bottom of Shelf 2220 1110 1110 185 x 12 0.5
Permanent Pool 3230 9690 10800 190 x 17 3
To of Shelf 4290 2415 13215 195 x 22 0.5
Temporary Pool 11000 11000 24215 200 x 55 1
Freeboard 1
Foba 20% 1938
Main Pool 80% 7752
Total Permanent Pool 9690
• The East Basin will collect water from the East Drainage; this water will be pulled
from rooftop and parking lot though pipes and collectively directed to the East
Stormwater Basin. Stormwater East Basin was calculate with 90% TSS removal
because of space limitations, therefore, no level spreader or 30' vegetated filter
' are required for this BMP. However, to prevent erosion of high flow events, the
outflow will go through a vegetative swale. There is at least a 30' vegetative
buffer between this basin and any live streams. The anticipated seasonal high
' water table for this basin is at approximately 926 ft above sea level.

Page 3
r
1

i

1
11
11

L11
Basin Dimensions SA s ft Volume cu ft Inc. Volume Dimensions ft Av. Depth
Sediment Storage 1
Bottom of Shelf 2464 1232 1232 112 x 22 0.5
Permanent Pool 3510 10530 11762 117 x 30 3
To of Shelf 4270 2135 13897 122 x 35 0.5
Temporary Pool 6500 6500 20397 130 x 50 1
Freeboard 1
Foba 20% 2106
Main Pool 80% 8424
Total Permanent Pool 10530
The calculations and design criteria were achieved using the "Stormwater Best
Management Practices Manual" compiled by NCDENR Division of Water Quality
(2007) and the Wet Detention Basin Supplement as designed by NC DWQ.
The designed wet detention basins will be used as sediment basins during construction.
After construction all sediment deposited during construction will be removed, erosional
features will be repaired, and the sizing, slopes, and depths will be restored as designed in
this stormwater management plan.
Appendix A: Stormwater West Basin
Basin Calculations
Plan View
Grading Cross-Sections
Inspection and Maintenance Agreement
Appendix B: Stormwater East Basin
Basin Calculations
Plan View
Grading Cross -Sections
Inspection and Maintenance Agreement
Appendix C: Vegetation Plan
Page 4
Appendix A
' Stormwater West Basin

1
1
Page 5
Permit
(to be provided by DWQ)
CJF W A rFfi?
WDENR °
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 III) must be printed, filled out and submitted along with all of the required information.

n

L

I. PROJECT INFORMATION
Project name Shuford Development
Contact person John Sigmon
Phone number 828-328-8306
Date 01/18/2008
Drainage area number SW-West
II. DESIGN INFORMATION
Site Characteristics
Drainage area 184,999 ft2
Impervious area 94,089 ft2
% impervious 50.85924146 %
Design rainfall depth 1.0 in
Storage Volume: Non-SR Waters
Minimum volume required 7,827 ft3
Volume provided 11,000 ft3
Storage Volume: SR Waters
1-yr, 24-hr runoff depth in
Pre-development 1-yr, 24-hr runoff ft3
Post-development 1-yr, 24-hr runoff ft3
Minimum volume required ft3
Volume provided ft3
Peak Flow Calculations
Is pre/post control of the 1-yr 24-hr peak flow required? N (Y or N)
1-yr, 24-hr rainfall depth 1.0 in
Rational C, pre-development 0.3 (unitless)
Rational C, post-development 0.7 (unitless)
Rainfall intensity: 1-yr, 24-hr storm 0.1 in/hr
Pre-development 1-yr, 24-hr peak flow 0.2 ft3/sec
Post-development 1-yr, 24-hr peak flow 0.4 ft3/sec
Pre/Post 1-yr, 24-hr peak flow control 0.2 ft3/sec
Basin Elevations
Basin bottom elevation 930.00 It
Sediment cleanout elevation 931.00 ft
Bottom of shelf elevation 933.50 ft
Permanent pool elevation 934.00 ft
Top of shelf elevation 934.50 ft
Temporary pool elevation 935.00 ft
Volume and Surface Area Calculations
SAIDA ratio
Surface area at the bottom of shelf
Volume at the bottom of shelf
Permanent pool, surface area required
Permanent pool, surface area provided
Permanent pool volume
Average depth for SAIDA tables
Surface area at the top of shelf
Volume at the top of shelf
Form SW401-Wet Detention Basin-Rev.3
1.73 (unitless)
2220.00 ft2
1110.00 ft,
3,200 ft2
3,230 ft
9,690 ft,
3 ft
4290 ft2
2415 ft3
OK
OK
Parts Design Summary West, Page 1 of 2
Page 6
Permit No
(to be provided by DWQ)
III. DESIGN INFORMATION
Forebay volume 1,938 ft3
Forebay % of permanent pool volume 20 % OK
Temporary pool, surface area provided 11,000 fe
Drawdown Calculations
Treatment volume drawdown time 5 days OK
Treatment volume discharge rate 0.03 ft3/s
Pre-development 1-yr, 24-hr discharge 1.27 ft3/s OK
Post-development 1-yr, 24-hr discharge 0.17 ft3/s OK
Additional Information
Diameter of orifice 0.75 in
Design TSS removal 85 %
Basin side slopes 3 :1 OK
Vegetated shelf slope 10 :1 OK
Vegetated shelf width 10 ft OK
Length of flowpath to width ratio 3.6 :1 OK
Length to width ratio 3.6 :1 OK
Trash rack for overflow & orifice? Y (Y or N) OK
Freeboard provided 1 ft OK
Vegetated filter provided? Y (Y or N) OK.
Recorded drainage easement provided? (Y or N)
Capures all runoff at ultimate build-out? Y (Y or N) OK
Drain mechanism for maintenance or emergencies

0

Form SW401-Wet Detention Basin-Rev.3
Parts Design Summary West, Page 2 of 2
I Page 7

1
1
1
1
1
1

n

SW-West Basin Calculations
Watershed Size: 4.247 acres
Impervious Area: 2.16 acres
Impervious Fraction: 0.51
TSS Removal: 85%
Removal Required: 1.65 units
Runoff Coefficient:
Rv=0.05+0.9*IA
Rv=0.05+0.9*50.86
Rv=0.50774
Volume to Be Controlled:
Post Development
V=3630*Rp*Rv-A
V=3630*1-.50774(4.247)
V= 7827.63 cu ft
Peak Flow Calculations: Post Development
Q=C*I*A
Q=0.7*.14*4.247
Q= .416 cfs
Peak Flow Calculations: Pre Development
Q=C*I*A
Q=.3*.14*4.247
Q= .178 cfs
5 Day Drawdown:
Q5= Temp Pool *43560/120*3600
Q5=.2525 *43560/120*3600
Q5=0.03 cfs
Orifice Equation:
Q=CDA sgrt(2gHo)
.03= 0.6(x)sgrt(2)(32.2)(.333)
A=.0023 sq ft
Diameter = .047 feet
Orifice Diameter = .56 inches
Use .75" Orifice
Emergency Spillway:
Q100 = 27 cfs - Q10(14 cfs)=13 cfs
15' bottom width/ 3:1 side slopes
Runoff Calcuations:
Impervious = 2.16 acres
Q = (.9)(6.5)(2.16)
Q = 12.6 cfs
Upper Grass = .5 acres
Q = (.3)(6.5)(.5)
Q = .98 cfs
Side and Lower Grass =.32 acres
Q = (.4)(6.5)(.32)
Q = .84 cfs
Q10=14.5 cfs
100 Year Event
Q1oo = (7)(9.0)(4.2)
Q100 = 27 cfs
Permanent Pool Required:
SA/DA = SA / total drainage
.0734 acres or 3200 sq ft
Wier Calculations: Sharp Crested Weir
Q=CWLH' .5
14.5 = 3.33333x1'.5
X=8
Weir Lengh = 8 ft
Driving Head = 1 ft
t Page 8
O
O
M
C
V
O
O
It
O
Ln
Cl)
O
O
M
O
L!)
N
d
V
O =
CD ?a
N N
0
O
Ln
r
O
O
r
O
LO
O
O
N
O
Page 9
O O O O O O
00 I,- co LO CY CO
O O O O O O
uOi;enal3
O
O
C
O
V
d
N
X
U) IT 'IT M M
am rn O O rn
UOIIBA013
0
0
v
0
LO
M
O
O
Cl)
O
LO
N
G1
u
o =
C) +g
N N
0
0
LO
0
0
O
U)
0
N
O
Page 10
C) LO O LO
I'- (p (p LO
m O O O
O
N ?
pia
U U)
(Q L
d J
i
O
2
N (n---
_
' `0) O
T
Nr
' O
CL
a? E
0
C:
m cn a?
m ? -0 a
_ J
' +n CD cn o
? cn ° o
0 a
a?
O
O co a
? N
C
1 U) E
N
d l
(6 M
_o (D
LL
a5
co
U
a
T O O
i O
Cl) LL
0 -0
LL U)
N
C
?a
? a
n
c
i

3
O
> N
po_
T
U
c ?j
O c^
07
E
w
f
j i
LO
?o
U (4
a
a
c ?
O
O
N

c m

N LL:

0
3
a a
.T U
N T
o
n

co
co

U'
O
E
a
d
J
(0
N >
3
c
0
07
B
y o
a2i
-nI
0
N
J
0
o
Page 11 1

(n
0

N 0
z
N
CL
0 U)

LL Cf)
N

N
-; N

MO (0
Ul
N O
LL

zo
...........
. -C

L_
-0
Y r a
Y ? O Q)

o> '
0
a?
a)
J
o
0 B
a
c
C
E
N
a
a

1
1

1
1

Permit Number:
(to be provided by DWQ)
Drainage Area Number:
Wet Detention Basin Inspection 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 F-1 does not incorporate a vegetated filter at the outlet.
This system (check one):
? does ® does not incorporate pretreatment other than a forebay.
Important maintenance procedures:
- Immediately after the wet detention basin is established, the plants on the
vegetated shelf and perimeter of the basin should be watered twice weekly if
needed, until the plants become established (commonly six weeks).
- No portion of the wet detention pond should be fertilized after the first initial
fertilization that is required to establish the plants on the vegetated shelf.
- Stable groundcover should be maintained in the drainage area to reduce the
sediment load to the wet detention basin.
- If the basin must be drained for an emergency or to perform maintenance, the
flushing of sediment through the emergency drain should be minimized to the
maximum extent practical.
- Once a year, a dam safety expert should inspect the embankment.
After the wet detention pond is established, it should be inspected once a month and
' within 24 hours after every storm event greater than 1.0 inches (or 1.5 inches if in a
Coastal County). Records of inspection 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 the problem:
The entire BMP Trash/ debris is resent. 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 I&M-Rev.2
Page 12
Permit Number:
(to be provided by DWQ)
Drainage Area Number:

1

r
G
1
1
BMP element: Potential problem: How I will remediate the problem:
The inlet device: pipe or The pipe is clogged. Unclog the pipe. Dispose of the
Swale sediment off-site.
The pipe is cracked or Replace the pipe.
otherwise damaged.
Erosion is occurring in the Regrade the swale if necessary to
swale. smooth it over and provide erosion
control devices such as reinforced
turf matting or riprap to avoid
future problems with erosion.
The forebay Sediment has accumulated to Search for the source of the
a depth greater than the sediment and remedy the problem if
original design depth for possible. Remove the sediment and
sediment storage. dispose of it in a location where it
will not cause impacts to streams or
the BMP.
Erosion has occurred. Provide additional erosion
protection such as reinforced turf
matting or riprap if needed to
prevent future erosion problems.
Weeds are present. Remove the weeds, preferably by
hand. If pesticide is used, wipe it on
the plants rather than spraying.
The vegetated shelf Best professional practices Prune according to best professional
show that pruning is needed practices
to maintain optimal plant
health.
Plants are dead, diseased or Determine the source of the
dying. problem: soils, hydrology, disease,
etc. Remedy the problem and
replace plants. Provide a one-time
fertilizer application to establish the
ground cover if a soil test indicates
it is necessary.
Weeds are present. Remove the weeds, preferably by
hand. If pesticide is used, wipe it on
the plants rather than spraying.
The main treatment area Sediment has accumulated to Search for the source of the
a depth greater than the sediment and remedy the problem if
original design sediment possible. Remove the sediment and
storage depth. dispose of it in a location where it
will not cause impacts to streams or
the BMP.
Algal growth covers over Consult a professional to remove
50% of the area. and control the algal growth.
Cattails, phragmites or other Remove the plants by wiping them
invasive plants cover 50% of with pesticide (do not spray).
the basin surface.
Form SW401-Wet Detention Basin I&M-Rev.2
1 Page 13
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
Permit Number:
(to be provided by DWQ)
Drainage Area Number:
BMP element: Potential problem: How I will rernediate the problem:
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 4 feet in the main pond, the sediment
shall be removed.
When the permanent pool depth reads 4_ feet in the forebay, the sediment shall
be removed.
BASIN DIAGRAM
ill in the blanks)
Permanent Pool Elevation 934
Sediment Removal t.931 Pe anen
--------------- Volume
Bottom Eleva0 -ft Min.
Sediment
Storage
FOREBAY
Form SW401-Wet Detention Basin I&M-Rev.2
Pool
------ Sediment Removal Elevation 931 ------------ Volume
Bottom Elevation 930 1-ft NYr
Sedimet
Storage
MAIN POND
Page 14

Permit Number
(to be provided by DWQ)
I admouledge 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.
Projecr name-Shuford Develcx,=eM Inc.
BMP drainage area number-BU P -Rest Basin
Nut
DaW:01-30-0$
Note: The legally respowble party should not be a homwwnars association u desa wM than 500/f, of
the bats have 1yeen sold and a resident of the subdMsion has been named the president
a Notary Public for the State of
County of G?z.7b A<c 6q v , do hereby certify that
persona ly appeared before me this
day of r` s% and acknowledge the due execution of the
forgoing wet de=tion basin mainteamce requirements. Witness my brand and official
Seal,
SEAL
My commissions C /?
Form SW40I- Wet Detention Basin I&M-Rev.2
Page 15

r

0

Appendix B
Stormwater East Basin
Page 16
1
Permit No.
(to be provided by DWQ)
WDENR
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATION APPLICATION FORM
WET DETENTION BASIN SUPPLEMENT
' This form must be filled out, printed and submitted.
The Required Items Checklist (Part 111) must be printed, filled out and submitted along with all of the required information.
' I. PROJECT INFORMATION
Project name Shuford Development
Contact person John sigmon
Phone number 828-328-8306
' Date 01/18/2008
Drainage area number SW-East
11. DESIGN INFORMATION
Site Characteristics
Drainage area 126,607 fe
Impervious area 45,738 ftz
% impervious 36.1259646 %
Design rainfall depth 1.0 in
Storage Volume: Non•SR Waters
Minimum volume required 3,958 ft3
Volume provided 6,500 ft3
Storage Volume: SR Waters
1-yr, 24-hr runoff depth in
Pre-development 1-yr, 24-hr runoff ft3
Post-development 1-yr, 24-hr runoff ft3
Minimum volume required ft3
Volume provided ft3
Peak Flow Calculations
Is pre/post control of the 1-yr 24-hr peak flow required? N (Y or N)
1-yr, 24-hr rainfall depth 1.0 in
Rational C, pre-development 0.3 (unitless)
Rational C, post-development 0.7 (unitless)
Rainfall intensity: 1-yr, 24-hr storm 0.1 in/hr
Pre-development 1-yr, 24-hr peak flow 0.1 ft3/sec
Post-development 1-yr, 24-hr peak flow 0.3 ft3/sec
Pre/Post 1-yr, 24-hr peak flow control 0.2 ft3/sec
Basin Elevations
Basin bottom elevation 924.50 It
Sediment cleanout elevation 925.50 ft
Bottom of shelf elevation 928.00 ft
Permanent pool elevation 928.50 ft
Top of shelf elevation 929.00 ft
Temporary pool elevation 929.50 ft
Volume and Surface Area Calculations
SAIDA ratio 2.50 (unitless)
Surface area at the bottom of shelf 2464.00 ft2
Volume at the bottom of shelf 1232.00 ft3
Permanent pool, surface area required 3,165 fe
Permanent pool, surface area provided 3,510 ftz OK
Permanent pool volume 10,530 ft3
Average depth for SAIDA tables 3 ft OK
Surface area at the top of shelf 4270 ftz
Volume at the top of shelf 2135 ft3
Form SW401-Wet Detention Basin-Rev.3
Parts 1.8 II. Design Summary, Page 1 of 2
Page 17
' Permit No.
(to be provided by DWQ)
' II. DESIGN INFORMATION
Forebay volume 2,106 ft3
Forebay % of permanent pool volume 20 % OK
Temporary pool, surface area provided 6,500 ft
' Drawdown Calculations
Treatment volume drawdown time 5 days OK
Treatment volume discharge rate 0.01 ft31s
' Pre-development 1-yr, 24-hr discharge 0.90 ft31s OK
Post-development 1-yr, 24-hr discharge 0.01 ft31s OK
Additional Information
Diameter of orifice 0.50 in
' Design TSS removal 90 %
Basin side slopes 3 :1 OK
Vegetated shelf slope 10 :1 OK
' Vegetated shelf width 10 ft OK
Length of flowpath to width ratio 3 :1 OK
Length to width ratio 2.6 :1 OK
Trash rack for overflow & orifice?
Freeboard provided Y
1 (Y or N)
ft OK
OK
Vegetated filter provided? Y (Y or N) OK
Recorded drainage easement provided? (Y or N)
Capures all runoff at ultimate build-out? Y (Y or N) OK
Drain mechanism for maintenance or emergencies

1

Form SW401-Wet Detention Basin-Rev.3 Parts I. & II. Design Summary, Page 2 of 2
I Page 18

SW-East Basin Calculations
Watershed Size: 2.9065 acres
Impervious Area: 1.05 acres
Impervious Fraction: 0.36
TSS Removal: 90%
Removal Required: 2.35 units
Runoff Coefficient:
Rv=0.05+0.9*IA
Rv=0.05+0.9*36.1259
Rv=.375134
' Volume to Be Controlled:
Post Development
V=3630*Rp*Rv-A
' V=3630*1 *.375134(2.9065)
V= 3957.8869 cu ft
' Peak Flow Calculations: Post Development
Q=C*I*A
Q=0.7*.14*2.9065
' Q= .285 cfs
Peak Flow Calculations: Pre Development
Q=C*I*A
' Q=0.3*.14*2.9065
Q= 0.122 cfs
' 5 Day Drawdown:
Q5= Temp Pool *43560/120*3600
Q5= 6490 *43560/120*3600
Q5 = 0.01502 cfs
Orifice Equation:
' Q=CpA sgrt(2gHo)
.01502= 0.6(x)sgrt(2)(32.2)(.333)
A=.00117 sq ft
' Diameter = .034 feet
Orifice Diameter = .408 inches
Use.5" Orifice
Emergency Spillway:
Q100 = 27 cfs - Q10(14 cfs)=13 cfs
'15' bottom width / 3:1 side slopes
Runoff Calcuations:
Impervious = 1.05 acres
Q = (.9)(6.5)(1.05)
Q = 6.1 cfs
Upper Grass = .66 acres
Q = (.3)(6.5)(.66)
Q = 1.3 cfs
Side and Lower Grass = .81 acres
Q = (.35)(6.5)(.81)
Q = 1.84 cfs
Q10=9.2cfs
100 Year Event
Q1oo = (.7)(9.0)(3)
Q1oo = 18.9 cfs
Permanent Pool Required:
SA/DA = SA / total drainage
.0727 acres or 3165.17 sq ft
Wier Calculations: Sharp Crested Weir
Q=CWLH'.5
9.2 = 3.33333x1
X =5.5
Weir Lengh =5.5 ft
Driving Head = 1 ft
Page 19
' O
1 i I i I ?
.----7--? I---i -J-f--{--- ---{-'- -1- M
i
it
--, -}-?+--ir----m-l-? i`----; -` 1 Imo- -f- !--i- I r --.-
r o OM
- O Ti ;I
0
O
O
CC
C
V
d
X
O
LO
N
d
v
O =
O ro
N N

0
O
0
O
Lr)
0
LO O LO 0 LO O Lc) O Lr) O U) O
r r (p (D Lf) Lr) 't IT M M N N
O O O O O O O m O O O O
UOIIBA013
Page 20
O
O
V
d
X
O
O
O
LO
Cl)
O
O
Cl)
O
LO
N
d
U
O =
O ?o
N N
0
O
O
O
O
In
O
O
N
CA
Page 21
LO C) CO Cfl LO m 0 LO 0 LO 'IT M OM N
01 O O O O CA m 0) O
U01jena13
1
r

Q)

-
r 1

? Cn U'

r
r
Q

O
? a
(4
L
O
' w- a
v
cn

n

> O J I-rs
o_
r E??
L_ U)
N
l11 r- 0
cn N
_0 O
r L_ + U)
0 d-
N
?
?, c
m

r N
a.
L
(B M
aN
1
0-
U-
Q
r
O
Cf]
U)
N
Q
>, O O
co

LL
0 U)
-
O O
8-0
LL U)
r N
1
a
?
U Q
i D.

r

1 c

m °
CL 0)
0
O
> Co
O >
-0 Q)
mw
-2-5
O
00
O
Ln
0
> m
O-2
a?
U
c ?
E
w

N
N
n
T O

N N
i°
N

N
..
............
....... N
??? m

O O
M ?q N
`O

O
T

LO cn
L
m a

I >

o

0
0
a
a?
c
m
E
a

° 0
o
Cl.

`
o
E
F
a?
m
m
0
a
C m:
O o:
n:

0

o
C
o
L

O
Z
E
IL
(n
0
Z
O
m
3
c
m
O
co

ti
co
CO
O
N
N
/ m
f o
N
O
Page 22
Permit Number:
1

(to be provided by DWQ)
Drainage Area Number:
Wet Detention Basin Inspection 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.
* calculated for 90% TSS Removal
This system (check one):
? does ® does not incorporate pretreatment other than a forebay.
Important maintenance procedures:
- Immediately after the wet detention basin is established, the plants on the
' vegetated shelf and perimeter of the basin should be watered twice weekly if
needed, until the plants become established (commonly six weeks).
- No portion of the wet detention pond should be fertilized after the first initial
' fertilization that is required to establish the plants on the vegetated shelf.
- Stable groundcover should be maintained in the drainage area to reduce the
' sediment load to the wet.detention basin.
- If the basin must be drained for an emergency or to perform maintenance, the
flushing of sediment through the emergency drain should be minimized to the
' maximum extent practical.
ect the embankment
ert should ins
ex
a dam safet
- Once a
ear
.
p
p
y
y
,
11

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 inspection 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 the problem:
The entire BMP Trash/ debris is resent. 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 I&M-Rev.2
Page 23

n

1
u

Permit Number:
(to be provided by DWQ)
Drainage Area Number:
BMP element: Potential problem: How I will remediate the problem:
The inlet device: pipe or The pipe is clogged. Unclog the pipe. Dispose of the
Swale sediment off-site.
The pipe is cracked or Replace the pipe.
otherwise damaged.
Erosion is occurring in the Regrade the swale if necessary to
swale. smooth it over and provide erosion
control devices such as reinforced
turf matting or riprap to avoid
future problems with erosion.
The forebay Sediment has accumulated to Search for the source of the
a depth greater than the sediment and remedy the problem if
original design depth for possible. Remove the sediment and
sediment storage. dispose of it in a location where it
will not cause impacts to streams or
the BMP.
Erosion has occurred. Provide additional erosion
protection such as reinforced turf
matting or riprap if needed to
prevent future erosion problems.
Weeds are present. Remove the weeds, preferably by
hand. If pesticide is used, wipe it on
the plants rather than spraying.
The vegetated shelf Best professional practices Prune according to best professional
show that pruning is needed practices
to maintain optimal plant
health.
Plants are dead, diseased or Determine the source of the
dying. problem: soils, hydrology, disease,
etc. Remedy the problem and
replace plants. Provide a one-time
fertilizer application to establish the
ground cover if a soil test indicates
it is necessary.
Weeds are present. Remove the weeds, preferably by
hand. If pesticide is used, wipe it on
the plants rather than spraying.
The main treatment area Sediment has accumulated to Search for the source of the
a depth greater than the sediment and remedy the problem if
original design sediment possible. Remove the sediment and
storage depth. dispose of it in a location where it
will not cause impacts to streams or
the BMP.
Algal growth covers over Consult a professional to remove
50% of the area. and control the algal growth.
Cattails, phragmites or other Remove the plants by wiping them
invasive plants cover 50% of with pesticide (do not spray).
the basin surface.
Form SW401-Wet Detention Basin I&M-Rev.2
Page 24

1
1
1
1
1
1
1
1

Permit Number:
(to be provided by DWQ)
Drainage Area Number:
BMP element: Potential problem: How I will remediate the problem:
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 4 feet in the main pond, the sediment
shall be removed.
When the permanent pool depth reads 4 feet in the forebay, the sediment shall
be removed.
BASIN DIAGRAM
ill in the blanks)
0 Permanent Pool Elevation 928.5
Sediment Removal .925.5 Pe anen Pool
- - - - - - - - - - - - - - - -- Volume Sediment Removal Elevation 925.5 Volume
Bottom Elevatio 924.5 -ft Min. - - - - -
Sediment Bottom Elevation 924.5 L11-ft n
Storage Sedimet
Storage
FOREBAY MAIN POND
Form SW401-Wet Detention Basin I&M-Rev.2
t Page 25
' Permit Number.
(to be provided by LtW'Q)
I acknowledge and agree by my signature below that I am responsible for the
' performance of the m inta,;llance procedures lisw above. I agree to notify DWQ of any
problems with the system or prior to arty changes to the system or responsible party.
Project name:SbyLord Development. Inc.
BMP drawage area nund7er'.WVF - Fast Basin
Print nameJolul Si2on ??®
' Tide :Director promtvv'Vfaaaement .
Address:PO Box 2228 Hickory, NC 28603

C

Nate: The legally respons'i`ble party should not be a homeowners association unless mare than 50% of
the lots have been sold and a resident of the Axbdirrii on has been named the prre0dent.
a Notary Public for the State of
County of t7?F??J?sL? do hereby certify that
?l n f personally eared before me this AQ
day of r_t?! and acknowledge the clue execution of the
forgoing vvet detention basin mamtenmce requirements. Witness my hand and Official
seal,
.
a
NC7A ; PUBLICy'
Caldweti Ccsuty
SEAL
M ronumssiou expires
l~orrn SW401-Wet pion Basin 1"-Revl
Page 26
' Appendix C
Vegetation Plan
Page 27
Vegetation Plan:
A uniform mix of topsoil will be brought in from off-site by one of the local soil
distribution companies listed on the plant schedule. It will be tested prior to use for the
appropriate pH, texture, nutrients, and content. Soils should have greater than 10% of
clay content for the wet detention basin. It will have a minimum of 5% organic content,
and a pH between 5.5 and 7.
All construction material will be removed before soils are placed within the BMP. The
soils will be compacted at the bottom of the basin to create an impermeable barrier
between the new topsoil and the existing native soils.
Plants will be brought in from one of the local nurseries listed on the plant schedule.
Depending on seasonality some plants may not be available; changes made to the plant
schedule must be done by the engineer. Plants will be planted in clumps rather than
individually. The following table breaks down the amount of planting materials needed.
SW- West SW- East
Minimum number of
300 180
Planting Clumps
Minimum # of
1050 625
Individual Plants
' Plants will be spaced at an average width of 8.5' and a minimum width of 6'. Random
spacing is encouraged to allow for a more natural look. A wet pond seed mix will be used
to stabilize all zones; it will be applied as instructed by the supplier.
After initial planting there should be an immediate watering to keep the plants from going
into shock from being transplanted. Fertilizers may be incorporated into the initial
planting but Should be avoided after that time.
Plants must survive at a rate of 90% after two years to be considered successful. At the
end of the first year staking from the live stakes will be removed, and all plants that did
not survive must be replaced. Any invasive weeds should be removed immediately. Re
staking, watering, and protective tubing should be used to maximize plant survival where
necessary.
Page 28
O)
c'4
m
tC
a
03

C?j
u
CC3
o3

Q Z ? ?

CS3
? O
4-4
O
O O
.? Q
d-
. o 1+°
N ?
r
O
I
M
En
a?
U M
U
L1, U
?N
? o
b ?
? •N
N
O
N
U
U
U
0
a?
U
cfi
U
w
i

y

N

7i
0
N

3 U v
?z?
? N o
.
Uj G N N
O
V
V) c c 3
N
O ?

N O
N

.? a?
U
U
U N
?

? O
N

0
c-?
N
m
m
a
«
3
?-
-?
?

?+ •? ct
? a
N ?

T ^
V1 r?
yam".-
3
0
N
O
p
I N l
o
'd
td 00
? O O
0
00
tV M N ?
?C U
O `V
OW

v N 1
y ?
> CL °

a
v c v z
v ?"' v O

Es f1 'O

Ao- - --
j r

Cz f1. ice..
.
? v cC O ?
°G cl

o > cr
wo
??
a3
N N N V °N X i I
cr

-o ,

CCl
rA O
O
U U
c U
? Q
U
N
L
0
M
U
- O
•-4 N

Q"
? U
O N
N ?

U

N
U ?
?
N O
N

.?
U U
N
U^ ?

? O
^
r
I '
r
) Oj
ENJ .
Environmental Consuitelg Services Inc.
643 Greenway Road
Suite K-3
Boone, NC 28608
828-264-8880
List of Local Nurseries:
Mallow Marsh
1312 Woody Store Road
Siler City, NC
919-742-1200
Farm House Gardeners
2142 Salisbury Hwy.
Statesville, NC
704-873-2057
Laurel Springs Nursery
401 Regal Street
Hendersonville, NC.
828-692-4012
Hanging Dog Valley Nursery
2600 Boiling Springs Road
Murphy, NC
828-837-7921
% inc 4 1 plaid ..n_.._._ ? _._..-_
I.:din Name (bnrolon Name 1-1:4n1 1\pe Illeight
I a\inu, I,cnn.\I\ani,:a" <irccn\sh I 1 h.,? 7.
.C,. 101,1,...„ Red %LtI,Ic I
14",14eckia hint. M-1, I Ned Suzan 11 1.
Acclr,,i0s u.hcn„c Ituncrlh \\ce,l I I I'
S-vlml lrunl n01:.11, Indian In-ass I I j.
Schiiac lt\rims. ccn1,,n oun
,_..,. - 1ntlc Itlkw,wol If
...-_._.-. IS'--
/one 1 -. Sirallo„ Laud
I.aiu LN ("onunon Naille Planl "F pe IIciI,M
\h-, c IaIata Ln. A1d,-1 \ 12"-'.U`
,\.r lcl,.:.-* n,,.I, lol,• 1\\:n il, 41ii\\ccd I I 1"
samhucu, can?Jensin I.ldcrhe,1 6 12'
S;di\ Crtcca Silk\ U ill?„\ I I. ,, to 30'
Itcuda ni}.ra Iti<cr Iti"l, I St1--75'
lunn.<r17Is, t„ V+.,I1 R'I'l, It

( :11'e\ g latlce,c'c•lls Southern \\:t\\ `ledge I I - 4
:A nd r., x,.,un v-irr•inic us linun,?sed •c I I ?.

%onc 2 -Shall-„ Walter
_
Lalin Name onatnon N:une PLtnt 1'ie Height
:\c„r us c:dallm, S\\cel i lue. I1 _
( oe\ . riniw Lrin,>'.cd Nedve I I _
I),.h,'.hlt.nl :Yr,nkll, l:le,'„Ill Ihree-\\:,\ tied!.'.,' II I.? t
(-'Cpjladaoth- ,ecidvwali, Ilottun ittush S
l'
1.;,, to If
Safi\ kricea silk\ %k ilh,\\ l 1 i, l„ 30'
Snli\ car.,linian t':{rol, na \\"ill"\% l 1''I, k, 50'
('arC\ zu icla 1 nannck -Ivc I I 7 ?•
S;. of U, ccr nn.m ( hard I:n1 fl -l'
Top Soil Locations:
/.nnc I I)ecp Pool
..
' _ _
Soil Supply Latin Nana C'ooutaun Name I-.pe
Plant Ileil! ll
-
< c,,hal urthus r,,. t Icnt0lis Mition hush S I ,, a, 11)
10219 Hagers Road 1, I, -n.,pl lus lal, tn,cm-Ilani ti,dt tilcn, Ituh-h I I t 1, to IIY
Huntersville, NC Alisn,a Whr ,rdatuol \\':ncr I'famain I I
704-875-3774 spiraca n„ncot„sa Ilard hack II 6.5
'
S;wiuaria lalilidi:, Arn,\,hrud If 1 •, lU 4
Markham Landscape
824 Hwy 16 North Storm Water Pond Seed Alic
.
-

Denver, NC Latin Narue
Av-,Iis snd„nilent ommon Name
(
( rccpin}!, llcotgrzt- Percent
25
704-489-2600 ("arc. ,nll,nt,idell I "\ `w,4gc 20
LI\r.n.s \iruillieus Virlant>. Wild R\e -..
Atlantic Supplies 11.•Irnium autunn,alr Sncaie\\eed 13
Iris \ctnicr,lur Blue Ilag. ?
174 West Plaza Drive Uc,lo-lin.ll candvo,c \ rick I Felon a
Hwy 150 Rodhcckia hirta Itlack-I \ cd Susan 4
Mooresville, NC Vcrhena hastal,• lih.e V,•rvain 4
704-660-9838 100
v
m

{
D 3
a

At least four species from each list will be planted per zone 2 - 4. Alternative species may be used if approved in advance by the engineer. Species may vary based on
seasonal availability from the local nursery.
All herbaceous species will be plugs, all trees bare roots, and shrubs will be live stakes. Any staking to be removed 1 year after planting.
A uniform topsoil will be brought in from offsite, before use it will be tested by a qualified individual for proper pH, soil texture, nitrogen levels, and content. Organic
content should be around 5% for herbaceous areas, and the pH between 5.5 and 7.0.
Shuford Development
Hickory, North Carolina
Planting Plan
Plant Schedule
w

ENV
Environmental Consu" Services Inc.
643 Greenway Road
Suite K-3
Boone, NC 28608
828-264-8880
CO,
Shuford Development
Hickory, North Carolina
Stormwater Planting Plan
Plant Placement Typical
ne. I
'2
3
Zone 4
Planting Specs:
• Plants to be placed in clumps of 2-5 individual plants.
• Plants to be spaced an average of 8.5' apart, and a minimum of 6', varying spacing will give a more natural look.
• Plantings to occur before water will be allowed to enter the BMP.
• All zones will be overseeded to provide stabilization within 10 days of the completion of the basin.
W
N