20081213 Ver 2_Stormwater Info_20081202

Suite 300
? ? Kimley-Horn D [2@ FJ q? \vy/ 4651 Charlotte Park Drive
q Charlotte, North Carolina
and Associates, Inc. 28217
DEC 1 C008 TEL [phone]
FAX [phone]
Transmittal DENR - WATER QUALITY
WETLMDE AND STORMWATER BRANCH 019- 12-13
Date: December 1, 2008 Job Number: 018253029
Project Name: South Tract City Blvd Development Stormwater Management Plans
To: Joseph Gyamfi
Division of Water Quality
2321 Crabtree Blvd, Suite 250
Raleigh, NC 27604
919-715-3473
We are sending these by
U.S. Mail ® FedEx ? Hand Deliver
Other:
We are sending you
®Attached F] Under separate cover via the following items:
Shop Drawings ® Prints/Plans ? Samples Specifications ? Change Orders
Other:
Copies Date No. Description
2 12/01/08 1 Revised South Tract City Blvd Stormwater Management Plans (C-6 and
C-7)
2 12/01/08 2 Revised South Tract City Blvd Stormwater Management Calculations
(supplement forms and volume/surface area tables)
2 12/01/08 3 Revised and Signed Operation and Maintenance Agreements
These are transmitted as checked below:
® For your use E ]Approved as submitted ? Resubmit ? Copies for approval
n As requested [:] Approved as noted Submit Copies for distribution
E] For review and comment E] Returned for corrections Return Corrected prints
Joe,
We trust this meets your needs at this time. Please let us know if anything else comes up.
Otherwise, we will be on the lookout for an approval letter from you. Thanks!
Copy to: Signed Beverly Rosenbloom, E.I.
Page 1

?EyK ?,ATER Q 1aIL r"Permit Number:
VaETtA?dD8 AN[? ,TOtZM'.ATER BftFt l'?H (to be provided by DWQ)
Drainage Area Number:
Wet Detention Basin Operation and Maintenance Agreement
I will keep a maintenance record on this BMP. This maintenance record will be kept in a
log in a known set location. Any deficient BMP elements noted in the inspection will be
corrected, repaired or replaced immediately. These deficiencies can affect the integrity
of structures, safety of the public, and the removal efficiency of the BMP.
The wet detention basin system is defined as the wet detention basin,
pretreatment including forebays and the vegetated filter if one is provided.
This system (check one):
? does ® does not incorporate a vegetated filter at the outlet.
This system (check one):
? does ® does not incorporate pretreatment other than a forebay.
Important maintenance procedures:
- Immediately after the wet detention basin is established, the plants on the
vegetated shelf and perimeter of the basin should be watered twice weekly if
needed, until the plants become established (commonly six weeks).
- No portion of the wet detention pond should be fertilized after the first initial
fertilization that is required to establish the plants on the vegetated shelf.
- Stable groundcover should be maintained in the drainage area to reduce the
sediment load to the wet detention basin.
- If the basin must be drained for an emergency or to perform maintenance, the
flushing of sediment through the emergency drain should be minimized to the
maximum extent practical.
- Once a year, a dam safety expert should inspect the embankment.
After the wet detention pond is established, it should be inspected once a month and
within 24 hours after every storm event greater than 1.0 inches (or 1.5 inches if in a
Coastal County). Records of operation and maintenance should be kept in a known set
location and must be available upon request.
Inspection activities shall be performed as follows. Any problems that are found shall
be repaired immediately.
BMP element: 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 O&M-Rev.3 Page 1 of 4
Permit Number:
(to be provided by DWQ)
Drainage Area Number:
BMP element:
The inlet device: pipe or
swale
The forebay
The vegetated shelf
The main treatment area
Potential problem:
The pipe is clogged.
The pipe is cracked or
otherwise damaged.
Erosion is occurring in the
swale.
Sediment has accumulated to
a depth greater than the
original design depth for
sediment storage.
Erosion has occurred
Weeds are present.
Best professional practices
show that pruning is needed
to maintain optimal plant
health.
Plants are dead, diseased or
dying.
Weeds are present.
Sediment has accumulated to
a depth greater than the
original design sediment
storage depth.
Algal growth covers over
50% of the area.
Cattails, phragmites or other
invasive plants cover 50% of
the basin surface.
How I will remediate the prob]
Unclog the pipe. Dispose of the
sediment off-site.
Replace the pipe.
Regrade the swale if necessary to
smooth it over and provide erosion
control devices such as reinforced
turf matting or riprap to avoid
future problems with erosion.
Search for the source of the
sediment and remedy the problem if
possible. Remove the sediment and
dispose of it in a location where it
will not cause impacts to streams or
the BMP.
Provide additional erosion
protection such as reinforced turf
matting or riprap if needed to
prevent future erosion problems.
Remove the weeds, preferably by
hand. If pesticide is used, wipe it on
the plants rather than spraying.
Prune according to best professional
practices
Determine the source of the
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.
Remove the weeds, preferably by
hand. If pesticide is used, wipe it on
the plants rather than spraying.
Search for the source of the
sediment and remedy the problem if
possible. Remove the sediment and
dispose of it in a location where it
will not cause impacts to streams or
the BMP.
Consult a professional to remove
and control the algal growth.
Remove the plants by wiping them
with pesticide (do not spray).
Form SW401-Wet Detention Basin O&M-Rev.3 Page 2 of 4
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 8 feet in the main pond, the sediment
shall be removed.
When the permanent pool depth reads 8 feet in the forebay, the sediment shall
be removed.
BASIN DIAGRAM
ill in the blanks)
Permanent Pool Elevation 726
Sediment Removal .718 Pe manen
-------------- -- Volume
Bottom Elevatio 717 -ft Min.
Sediment
Storage
FOREBAY
Pool
Sediment Removal Elevation 718 Volume
----------------------------------- ------
Bottom Elevation 717 1 1-ft 111
Sedimet
Storage
MAIN POND
Form SW401-Wet Detention Basin O&M-Rev.3 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:South Tract City Boulevard Development
BMP drainage area number:
Print name:Crescent Resources, LLC - David Niekamp
Title:Director of Retail Development
Address:400 South TU on Street, Suite 1300, Charlotte, NC 28285
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, (
IM /?I, ?a Notary Public for the State of
n?
1 ?. , County of do hereby certify that
AAA personally appeared before me this
day of De fli', 4 $1- , and acknowledge the due execution of the
forgoing wet detention basin maintenance requirements. Witness my hand and official
seal,
My commission expires My won Expires August 17, 2013
Form SW401-Wet Detention Basin O&M-Rev. 3
Page 4 of 4
Date: ??/?P lfx'H
n j'
LFDENk P1 -RRM' ?TEfi ,pg E.f, ERFJdi-H
V4ETLN40S AND Sid
Permit Number:
(to be provided by DWQ)
Drainage Area Number:
Wet Detention Basin Operation and Maintenance Agreement
I will keep a maintenance record on this BMP. This maintenance record will be kept in a
log in a known set location. Any deficient BMP elements noted in the inspection will be
corrected, repaired or replaced immediately. These deficiencies can affect the integrity
of structures, safety of the public, and the removal efficiency of the BMP.
The wet detention basin system is defined as the wet detention basin,
pretreatment including forebays and the vegetated filter if one is provided.
This system (check one):
? does ® does not incorporate a vegetated filter at the outlet.
This system (check one):
? does ® does not incorporate pretreatment other than a forebay.
Important maintenance procedures:
- Immediately after the wet detention basin is established, the plants on the
vegetated shelf and perimeter of the basin should be watered twice weekly if
needed, until the plants become established (commonly six weeks).
- No portion of the wet detention pond should be fertilized after the first initial
fertilization that is required to establish the plants on the vegetated shelf.
- Stable groundcover should be maintained in the drainage area to reduce the
sediment load to the wet detention basin.
- If the basin must be drained for an emergency or to perform maintenance, the
flushing of sediment through the emergency drain should be minimized to the
maximum extent practical.
- Once a year, a dam safety expert should inspect the embankment.
After the wet detention pond is established, it should be inspected once a month and
within 24 hours after every storm event greater than 1.0 inches (or 1.5 inches if in a
Coastal County). Records of operation and maintenance should be kept in a known set
location and must be available upon request.
Inspection activities shall be performed as follows. Any problems that are found shall
be repaired immediately.
BMP element: 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
lon a roximatel six inches.
Form SW401-Wet Detention Basin O&M-Rev.3
Page 1 of 4
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 O&M-Rev. 3 Page 2 of 4
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 7 feet in the main pond, the sediment
shall be removed.
When the permanent pool depth reads 8 feet in the forebay, the sediment shall
be removed.
BASIN DIAGRAM
(fill in the blanks)
0 Permanent Pool Elevation 719
Sediment Removal .711 Pe manen Pool
- - - - - - - - - - - -- Volume Sediment Removal Elevation 712 Volume
------------------------------------------ ------
Bottom Elevatio 710 -ft Min.
Sediment Bottom Elevation 711 1-ft n
Storage Sedimer
Storage
FOREBAY MAIN POND
Form SW401-Wet Detention Basin O&M-Rev.3 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: South Tract City Boulevard Development
BMP drainage area
Print name:Crescent Resources, LLC - David Niekamp
Title:Director of Retail Development
Address:400 South Tryon Street, Suite 1300, Charlotte NC 28285
Phon
Signz
Date:
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,
)%'4w R _g , a Notary Public for the State of
, County of ? 4? n it] +'f do hereby certify that
Avid /V;(-K/"p personally appeared before me this - '
day of CAMj?/'? and acknowledge the due execution of the
forgoing wet detention basin maintenance requirements. Witness my hand and official
seal,
1
r
r -
SEAL
q«gtd 17,2013
My commission expires ?C wow-Expires
Form SW401-Wet Detention Basin O&M-Rev.3
Page 4 of 4
Permit No.
AMSVIIA'r
NCDENR
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.
(to be provided by DWQ)
O?O? W A r?RQG
O T
L PROJECT INFORMATION
Project name Belgate Southern Tract
Contact person Beverly Rosenbloom, El
Phone number 704-319-7699
Date 11/24/2008
Drainage area number 1
II. DESIGN INFORMATION
Site Characteristics
Drainage area 311,454.00 ft2
Impervious area 280,090.80 ft2
% impervious 89,93 %
Design rainfall depth 1.00 in
Storage Volume: Non-SR Waters
Minimum volume required
Volume provided
Storage Volume: SR Waters
1-yr, 24-hr runoff depth
Pre-development 1-yr, 24-hr runoff
Post-development 1-yr, 24-hr runoff
Minimum volume required
Volume provided
Peak Flow Calculations
1-yr, 24-hr rainfall depth
Rational C, pre-development
Rational C, post-development
Rainfall intensity: 1-yr, 24-hr storm
Pre-development 1-yr, 24-hr peak flow
Post-development 1-yr, 24-hr peak flow
Pre/Post 1-yr, 24-hr peak flow control
Basin Elevations
Basin bottom elevation
Sediment cleanout elevation
Bottom of shelf elevation
Permanent pool elevation
SHVVT elevation
Top of shelf elevation
Temporary pool elevation
22,305.00 ft3
28,586.00 ft3
in
ft3
ft3
ft3
ft3
2.58 in
0.28 (unitless)
0.88 (unitless)
0.12 in/hr
2.63 ft3/sec
9.25 ft3/sec
6.62 ft3/sec
717.00 ft
718.00 ft
725.50 ft
726.00 ft
712.00 ft
726.50 ft
727.70 ft
??
DEC 2 2008
DENS: -RATER QUALITY
WETLANDS AND STQRWWIATER BRANCH
Form SW401-Wet Detention Basin-Rev.4 Parts I. & II. Design Summary, Page 1 of 2
Permit No.
(to be provided by DWQ)
11. DESIGN INFORMATION
Volume and Surface Area Calculations
SA/DA ratio 4.00 (unitless)
Surface area at the bottom of shelf 11,462.00 ftz
Volume at the bottom of shelf 52,187.00 ft3
Permanent pool, surface area required 12,458.00 ftz
Permanent pool, surface area provided 14,257.00 ftz OK
Permanent pool volume 58,619.00 ft3
Average depth for SA/DA tables 4.11 It OK
Surface area at the top of shelf 17,373.00 ftz
Volume at the top of shelf 66,405.00 ft3
Forebay volume 10,977.00 ft3
Forebay % of permanent pool volume 18.73 % OK
Temporary pool, surface area provided 19,373.00 ftZ
Drawdown Calculations
Treatment volume drawdown time 3.30
Treatment volume discharge rate 0.10
Pre-development 1-yr, 24-hr discharge 2.63
Post-development 1-yr, 24-hr discharge 1.76
Additional Information
Diameter of orifice 2.3
Design TSS removal 90
Basin side slopes 3.00
Vegetated shelf slope 10.00
Vegetated shelf width 10.00
Length of flowpath to width ratio 4.40
Length to width ratio 3.30
Trash rack for overflow & orifice? Y
Freeboard provided 2.25
Vegetated filter provided? N
Recorded drainage easement provided? Y
Capures all runoff at ultimate build-out? Y
Drain mechanism for maintenance or emergencies 24-HR
days OK
ft3/s
ft3/s OK
ft3/s OK
in
:1 OK
:1 OK
It OK
:1 OK
:1 OK
(Y or N) OK
It OK
(Y or N) Design must be based on 90% TSS removal
(Y or N) OK
(Y or N) OK
EMERGENCY PUMP
Form SW401-Wet Detention Basin-Rev.4 Parts I. & II. Design Summary, Page 2 of 2
Permit No.
(to be provided by DWQ)
OF W a rFR
O? PG
NCaENR
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 Belgate Southern Tract
Contact person Beverly Rosenbloom, El
Phone number 704-319-7699
Date 11/24/2008
Drainage area number 2
IL DESIGN INFORMATION
Site Characteristics
Drainage area 1,062,864.00 ft2
Impervious area 797,148.00 ft2
% impervious 75.00 %
Design rainfall depth 1.00 in
Storage Volume: Non-SR Waters
Minimum volume required 64,215.00 ft3
Volume provided 67,468.00 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 ft 3
Peak Flow Calculations
1-yr, 24-hr rainfall depth 2.58 in
Rational C, pre-development 0.28 (unitless)
Rational C, post-development 0.79 (unitless)
Rainfall intensity: 1 -yr, 24-hr storm 0.12 in/hr
Pre-development 1-yr, 24-hr peak flow 1.57 ft3lsec
Post-development 1-yr, 24-hr peak flow 24.36 ft3lsec
Pre/Post 1-yr, 24-hr peak flow control 22.79 ft3lsec
Basin Elevations
Basin bottom elevation 711.00 ft
Sediment cleanout elevation 712.00 ft
Bottom of shelf elevation 718.50 ft
Permanent pool elevation 719.00 ft
SHWT elevation 708.00 ft
Top of shelf elevation 719.50 ft
Temporary pool elevation 720.60 ft
Form SW401-Wet Detention Basin-Rev.4 Parts I. & II. Design Summary, Page 1 of 2
Permit
(to be provided by DWQ)
II. DESIGN INFORMATION
Volume and Surface Area Calculations
SAIDA ratio 3.38 (unitless)
Surface area at the bottom of shelf 33,899.00 ft2
Volume at the bottom of shelf 163,941.00 ft3
Permanent pool, surface area required 35,872.00 ft2
Permanent pool, surface area provided 38,235.00 ft2 OK
Permanent pool volume 181,976.00 ft3
Average depth for SAIDA tables 4.76 ft OK
Surface area at the top of shelf 42,920.00 ft2
Volume at the top of shelf 202,265.00 ft3
Forebay volume 33,586.00 ft3
Forebay % of permanent pool volume 18.46 % OK
Temporary pool, surface area provided 46,100.00 ft2
Drawdown Calculations
Treatment volume drawdown time 5.00 days OK
Treatment volume discharge rate 0.16 ft3/s
Pre-development 1-yr, 24-hr discharge 1.57 ft3/s OK
Post-development 1-yr, 24-hr discharge 1.51 ft3/s OK
Additional Information
Diameter of orifice 2.9 in
Design TSS removal 90 %
Basin side slopes 3.00 :1 OK
Vegetated shelf slope 10.00 :1 OK
Vegetated shelf width 10.00 ft OK
Length of flowpath to width ratio 4.10 :1 OK
Length to width ratio 3.20 :1 OK
Trash rack for overflow & orifice? Y (Y or N) OK
Freeboard provided 2.65 ft OK
Vegetated filter provided? N (Y or N) Design must be based on 90% TSS removal
Recorded drainage easement provided? Y (Y or N) OK
Capures all runoff at ultimate build-out? Y (Y or N) OK
Drain mechanism for maintenance or emergencies 24-HR EMERGENCY PUMP
Form SW401-Wet Detention Basin-Rev.4 Parts I. & II. Design Summary, Page 2 of 2
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