SW8080317_CURRENT PERMIT_20120329

STORMWATER DIVISION CODING SHEET
POST -CONSTRUCTION PERMITS
PERMIT NO.
SW8 010'3 1
DOC TYPE
CURRENT PERMIT
❑ APPROVED PLANS
❑ HISTORICAL FILE
❑ COMPLIANCE EVALUATION INSPECTION
DOC DATE
`L012U320%
YYYYMMDD

F�
NC®ENR
North Carolina Department of Environment and Natural Resources
Division of Water Quality
Beverly Eaves Perdue Charles Wakild, P. E. Dee Freeman
Governor Director Secretary
March 29, 2012
Mr. Randy Blanton
PO Box 10137
Wilmington, NC 28404
Subject: Approved Plan Revision and Permit Extension
Covil Gardens
Stormwater Permit No. SW8 080317
New Hanover County
Dear Mr. Blanton:
On March 22, 2012, the Wilmington Regional Office received a request to revise the approved plans for Stormwater
Management Permit Number SW8 080317. The revisions include reallocating impervious area as described in the
table below. It has been determined that a formal permit modification is not required for the proposed changes. We
are forwarding you an approved copy of the revised plans for your files. Please replace the old approved plan sheets
with the new ones.
Onsite Buildings
Onsite Parking/Asphalt
Onsite Sidewalks/Concrete
Future
Total
5/24/11 Permit
3/29/11 Plan Revision
Pond
(DA 1)
Sand Filter
(DA2)
Pond
(DA 1)
Sand Filter
(DA2)
12,880
1,715
13,141
1,91S
22,281
6,419
21,985
5,906
8,973
600
8,735
637
6,626
1 0 1
6,898
1 276
50,760 1
8,734 1
50,759
1 8,734
Please be aware that all terms and conditions of the permit issued on May 24, 2011, remain in full force and
effect. Please also understand that the approval of this revision to the approved plans for the subject State
Stormwater Permit is done on a case -by -case basis.
On August 5, 2009, the Governor signed Session Law 2009-406. This law impacts any development approval
issued by the Division of Water Quality under Article 21 of Chapter 143 of the General Statutes, which is current
and valid at any point between January 1, 2008, and December 31, 2010. The law extends the effective period
of any stormwater permit that was set to expire during this time frame to three (3) years from its current
expiration date. On August 2, 2010, the Governor signed Session Law 2010-177, which granted an extra year
for a total of four (4) years extension. The Division is hereby notifying you that permit SW8 080317 has been
issued a Plan Revision and shall be effective until January 31, 2019, which includes the permit extension.
Please attach this letter to your High Density Permit most recently issued on May 24, 2011.
Any other changes to this project must be approved through this Office prior to construction. The issuance of this
plan revision does not preclude the pennittee from complying with all other applicable statutes, rules, regulations
or ordinances which may have jurisdiction over the proposed activity, and obtaining a permit or approval prior to
construction.
Wilmington Regional Office
127 Cardinal Dnve Extension, Wilmington, North Carolina 28405 One
Phone [phone] FAX. [phone] DENR Assistance: 1-877-623-6748 NorthCarolina
Internet. w .nmaterquality.org ��/� atima//ff
An Equal Opportunity l AKrmAction ative Employer K` L "

If you have any questions concerning this matter, please do not hesitate to call Georgette Scott or me at (910)
796-7215.
Sincer I
II Joi son
Envir mental Engineer
GDS*pj: SAWQS1StormwateAPermits & Projects120081080317 HD12012 03 permit_pr 080317
cc: Phil Tripp, PE
Inspector, New Hanover County Building Inspections
Wilmington Regional Office
Page 2 of 2

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e n1 (oldo8• ?o'".1ut) K Ft If+
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`�i 0_ to 0.0 (y�-
Wet Detention Basin Inspection and Maintenance Agreement �A)3O9ZS/%
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 IForebay.
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:
Potentialproblem:
How I will remediate theproblem:
The entire BMP
Trash/debris is present,
Remove the trash/debris.
The perimeter of the wet
detention basin
Areas of bare soil and/or
erosive gullies have formed.
Regrade the soil if necessary to
remove the gully, and then plant a
ground cover and water until it is
established. Provide time and a
one-time fertilizer application.
Vegetation is too short or too
Ion
Maintain vegetation at a height of
aDDroximatpiv six inches.

BMP element:
Potentialproblem:
How I will remediate theproblem:
The inlet device: pipe or
Swale
The pipe is clogged.
Unclog the pipe. Dispose of the
sediment off -site.
The pipe is cracked or
Replace the pipe.
otherwise dama ed.
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
reventfuture 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
show that pruning is needed
Prune according to best professional
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 Eowth.
Cattails, phragmites or other
Remove the plants by wiping them
invasive plants cover 50% of
the basin surface.
with pesticide (do not spray)

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 spenalist 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 offsite.
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 P.egional 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 _9_0_ feet in the main pond, the sediment
shall be removed.
When the permanent pool depth reads 4.0 feet in the forebay, the sediment
shall be removed.
Sediment Removal
Bottom
BASIN DIAGRAM
601 in the blanks)
Permanent Pool Elevation 29.0
2-i 0 Pe marten Pool
--------------- Volume Sediment Removal Elevation �trrr-' 2�-� Volume
290 -ft Min. -------------------------------------------- ------
Sediment Bottom Elevation49-R-?A O 1-R n.
Storage Sediment
pot-ageFOREBAY MAIN POND 6VVW yL9-1
RECEIVED
LMAY 02 2011
___

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.
Print name:Randv Blanton
Address:P.O. Box 10137, Wilmington NC 28404
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, —DPRO C3/ cj a Notary Public for the State of
CAtah'i County of _, do hereby certify that
n v personally appeared before me this 3D
day of o Jrmbfr , ZOO , and acknowledge the due execution of the
forgoing wet detention basin maintenance requirements. Witness my hand and official
seal,
SEAL
My commission expires f Cti -17 -11

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.
This system (check one):
❑ does [55�11 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:
Potentialproblem:
How I will remediate theproblem:
The entire BMP
Trash/debris is present.
Remove the trash/debris.
The perimeter of the wet
detention basin
Areas of bare soil and/or
erosive gullies have formed.
Regrade the soil if necessary to
remove the gully, and then plant a
ground cover and water until it is
established. Provide lime and a
one-time fertilizer application.
Vegetation is too short or too
Maintain vegetation at a height of
long.
approximately six inches.

BMP element:
Potentialproblem:
How I will remediate theproblem:
The inlet device: pipe or
The pipe is clogged.
Unclog the pipe. Dispose of the
swale
sediment off -site.
The pipe is cracked or
Replace the pipe.
otherwise damaged.
Erosion is occurring in the
Regrade the swale if necessary to
Swale.
smooth it over and provide erosion
control devices such as reinforced
turf matting or riprap to avoid
future problems with erosion.
The forebay
Sediment has accumulated to
Search for the source of the
a depth greater than the
sediment and remedy the problem if
original design depth for
possible. Remove the sediment and
sediment storage.
dispose of it in a location where it
will not cause impacts to streams or
the BMP.
Erosion has occurred.
Provide additional erosion
protection such as reinforced turf
matting or riprap if needed to
prevent future erosion problems.
Weeds are present.
Remove the weeds, preferably by
hand. If pesticide is used, wipe it on
the plants rather than s ra in .
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.

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 prow 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 re air.
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 he such
that it will give an accurate depth reading and not readily penetrate into
accumulated sediments.
When the permanent pool depth reads _90 feet in the main pond, the sediment
shall be removed.
When the permanent pool depth reads _4.0 feet in the forebay, the sediment
shall be removed.
Sediment Removal
Bottom
25.0
---------------
BASIN DIAGRAM
ill in the blanks)
t--ft Min.
Sediment
Storage
Permanent Pool Elevation 29.0
Pool
Sediment Removal Elevation 20.0 Volume
\--'---------- ------- -------- ---- ---'-------' -----
Bottom Elevation
FOREBAY MAIN POND
1-ft
Storage

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.
Print name:Randy Blanton
Address:P.O. Box 10137, Wilmington, NC 28404
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.
1, :I)e.tl a C In i rd , a Notary Public for the State of
Cac6jjnG_ , County of P(,pf{.pr , do hereby certify that
personally appeared before me thisc30
day of %V f�_, ZjO , and acknowledge the due execution of the
forgoing wet detention basin maintenance requirements. Witness my hand and official
seal,
` C. o`Ot� ..: �,..
• NOTAgy=:�
"qnyou%
SEAL
/�Ijk G .dam
My commission expires f (1-15-11

Permit Number: O
(to be provided by DWQ)
Drainage Area Number:
Sand Filter 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.
Important maintenance procedures:
— The drainage area will be carefully managed to reduce the sediment load to the sand filter.
— The sedimentation chamber or forebay will be cleaned out whenever sediment depth exceeds
six inches.
— Once a year, sand media will be skimmed.
— The sand filter media will be replaced whenever it fails to function properly after maintenance.
The sand filter will be inspected quarterly 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 will be kept in
a known set location and will be available upon request.
Inspection activities shall be performed as follows. Any problems that are found shall be repaired
immediately.
'BMP element:^ •:` - "'
_Pdtential,problem:
How I will remediate tfie'problem:: &,<a'
Entire BMP
Trash/debris is present.
Remove the trash/debris.
Adjacent pavement (if
Sediment is present on the
Sweep or vacuum the sediment as soon as
applicable)
pavement surface.
possible.
Perimeter of sand filter
Areas of bare soil and/or erosive
Regrade the soil if necessary to remove the
gullies have formed.
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 long.
Maintain vegetation at an appropriate
height.
Flow diversion structure
The structure is clogged.
Unclog the conveyance and dispose of any
sediment offsite.
The structure is damaged.
Make any necessary repairs or replace if
damage is too large for repair.
Forebay or pretreatment area
Sediment has accumulated to a
Search for the source of the sediment and
depth of greater than six inches.
remedy the problem if possible. Remove
the sediment and stabilize or 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
a pesticide is used, wipe it on the plants
rather than s ra in .
RECEIVED
APR 0 5 2011
Form SW401-Sand Filter O&M-Rev.4 2009Septl7 Page 1 of 3

;How I,will,remediate?ttie roble''m:=
Filter bed and underdrain
Water is ponding on the surface for
Check to see if the collector system is
collection system
more than 24 hours after a storm.
clogged and flush if necessary. If water
still ponds, remove the top few inches of
filter bed media and replace. If water still
ponds, then consult an expert.
Outlet device
Clogging has occurred.
Clean out the outlet device. Dispose of the
sediment offsite.
The outlet device is damaged
Repair or replace the outlet device.
Receiving water
Erosion or other signs of damage
Contact the NC Division of Water Quality
have occurred at the outlet.
401 Oversight Unit at 919-733-1786.
�, r APR 0 5 2011
Form SW401-Sand Filter O&M-Rev.4 2009Septl7 Page 2 of 3

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:Covil Gardens
BMP drainage area number:2
Print name:Randy Blanton
Address:P.O. Box 10137, Wilmington, NC 28404
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, _ o& C . %?a Oak a Notary Public for the State of
Cr,✓ol , County of f,( do hereby certify that
aA6%t L a personally appeared before me this 3 day of
MWrl-. 21DI I , and acknowledge the due execution of the forgoing sand filter
maintenance requirements. Witness my hand and official seal,
�:'NOTAgy,�
e . s
�,A pUBL1G.:a`c
COUTA `
tttmninnu�a
SEAL
My commission expires
APR 0 5 J0\%
Form SW401-Sand Filter O&M-Rev.4 2009Sept17 Page 3 of 3

t
•. . - , 1.� DWQ USE -ONLY -_
Date Received
Fee Paid (express only)
Permit Number
State of North Carolina
Department of Environment and Natural Resources
Division of Water Quality
STORMWATER MANAGEMENT PERMIT PLAN REVISION APPLICATION FORM
This form may be photocopied for use as an original
I. GENERAL INFORMATION
1. Stormwater Management Permit Number: SW8 080317
2. Project Name:
3. Permit Holder's name (specify the name of the corporation, individual, etc.):
4. Print Owner/Signing Official's name and title (person legally responsible for permit):
Randy Blanton
5. Mailing Address for person listed in item 2 above:
City:Wilmington State:NC Zip:28404
Phone: [phone] Fax:
Email:
GEI V®
!I. PLAN REVISION INFORMATION
1. Summarize the plan revision proposed (attach additional pages if needed):
The proposed changes include revised building footprints decreased parking area and revised sidewalks
The overall impervious to each BMP remained the same
III. 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 DWQ Office that issued the permit.
1. Please indicate that you have provided the following required information by initialing in the space provided
next to each item.
Initials
• Original £a 1 copy of the Plan Revision Application Form /z-e
• Two (2) copies of revised plans (must be revisions of original approved plan sheet(s))yL
If applying for Express review (only available in 20 coastal counties):
• Application fee of $500.00 (made payable to NCDENR) �ZA
VI. APPLICANT'S CERTIFICATION
I, (print or hype naive of person listed in General Information, item 3) Randy Blanton
certify that I have aullorized these plan revisions and that the information included on this plan revision
application is, to st of my know d corr and complete. 7
Signature: ri-.'/aJ�, Date: J � 2 1 �/;Z
Plan Revision Form Rev 13July2010 Page I of I

Permit No`_�5'�
(to be provided by OWQ)
AW ATEgOG
NCDENR
STORMWATER MANAGEMENT PERMIT APPLICATION FORM o
g
401 CERTIFICATION APPLICATION FORM
WET DETENTION BASIN SUPPLEMENT
This form must be filled out, printed and submitted.
The Required Items Checklist (Part IIQ must be printed, filled out and submitted along with all of the required information.
I: PROJECT INFORMATION
Project name Covil Gardens -
Contact person Phil Trim. P E.
Phone number
Date
Drainage area number
910-763-5100
II. DESIGN INFORMATION,
Site Characteristics
Drainage area
74,076
'ry2
Impervious area
50,760
rye
% impervious
68.52421837
%
Design rainfall depth
1.5
; in
Storage Volume: Non -SR Waters
Minimum volume required
6,173
rya
Volume provided
9,085
rya
Storage Volume: SR Waters
1-yr, 24-hr runoff depth
in
Pre -development 1-yr, 24-hr runoff
-
ff3
Post -development 1-yr, 24-hr runoff
ft3
Minimum volume required
ff3
Volume provided
•ff3
Peak Flow Calculations
Is pre/post control of the 1-yr 24-hr peak flow required?
y
.(Y or N)
1-yr. 24-hr rainfall depth
3.9
'in
Rational C, pre -development
_ 0.3
r(unitless)
Rational C, post -development
0.7
(unitless)
Rainfall intensity: 1-yr, 24-hr storm
5.6
in/hr
Pre -development 1-yr, 24-hr peak flow
27
ff3lsec
Post -development 1-yr, 24-hr peak flow
7.4
ft3lsec
Pre/Post 1-yr, 24-hr peak flow control
4.7
ft3lsec
Basin Elevations
Basin bottom elevation
20.00
it
Sediment cleanout elevation
21.00
ff
Permanent pool elevation
29.00
It
Temporary pool elevation
31.00
It
Volume and Surface Area Calculations
SAIDA ratio
4.90
(unilless)
Permanent pool, surface area required
3,630
ffz
Permanent pool, surface area provided
3,750
ffz OK
Permanent pool volume
16,943
.rya
Average depth for SAIDA tables
4 518133333
it OK
Forebay volume r
3,389
ff3
Forebay % of permanent pool volume
20
% OK
Temporary pool, surface area provided
5,335
ff'
Fomn SW401-Wet Detention Basn-Rev.2 Parts I. & 11. Design Summary, Page 1 of 2

�!
Permit No.
.,
(to be Omwded by DWQ)
II: DESIGN INFORMATION
Drawdown Calculations
Treatment volume drawdown time
2.72
_
,days
OK
Treatment volume discharge rate
003
'ft3/s
Pre -development l-yr,24-hrdischarge
! 272
'ft3/s
OK
Post -development 1-yr, 24-hr discharge
047
ft3/s
OK
Additional Information
Diameter of orifice
1.00
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 gowpath to width ratio
3
:1
OK
Length to width ratio
2
:1
OK
Trash rack for overflow 6 orifice?
Y
(Y or N)
OK
Freeboard provided
2
ft
OK
Vegetated filter providedv
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
Pump
_
--
RECEIVED
MAY 0 2 2011
BY:
Form SW401-Wet Deienbon Basin-Rev.2 Pans I. a 11 Design Summary, Page 2 of 2

Permit No. 5 LX9
030317
(to be provbed by D;V )
WATF9
�r�44NC��� .•ftaD♦i►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 III) must be printed, filled out and submitted along with all of the required information
I. PROJECT INFORMATION -
-
Project name
Covil Garderm
Contact person
Charles Caner
Phone number
910 763-5100
Date
Drainage area number
1
III. DESIGN INFORMATION
Site Characteristics
Drainage area
84,076
ff
Impervious area
50,928
ff
%impervious
60.57376659
%
Design rainfall depth
1.5
in
Storage Volume: Non -SR Waters
Minimum volume required
6,255
to
Volume provided
9,516
ft3
Storage Volume: SR Waters
1-yr, 24-hr runoff depth
in
Pre -development 1-yr, 24-hr runoff
ft'
Post -development 1-yr, 24-hr runoff
it,
Minimum volume required
ft3
Volume provided
ft'
Peak Flow Calculations
Is prelpost control of the 1-yr 24-hr peak flow required?
y
(Y or N)
1-yr, 24-hr rainfall depth
3.9
in
Rational C, pre -development
0.3
(unitless)
Rational C, post -development
0.7
(unitless)
Rainfall intensity: 1-yr, 24-hr storm
5.6
in/hr
Pre -development 1-yr, 24-hr peak flow
2.7
ft'/sec
Post -development 1-yr, 24-hr peak flow
7.4
ft'/sec
Pre/Post 1-yr, 24-hr peak flow control
4.7
ft'Isec
Basin Elevations
Basin bottom elevation
19.00
It
Sediment cleanout elevation
20.00
It
Permanent pool elevation
29.00
It
Temporary pool elevation
31.00
ft
Volume and Surface Area Calculations
SAIDA ratio
4.37
(unless)
Permanent pool, surface area required
3,674
fir
Permanent pool, surface area provided
3,992
Ill OK
Permanent pool volume
18,297
ft3
Average depth for SAIDA tables
4.583416834
it OK
Forebay volume
3,426
ft3
Forebay 0.6 of permanent pool volume
19
% OK
Temporary pool, surface area provided
5,524
112
Form SW401-Wet Detention Basm-Rev 2 Parts I. & II. Design Summary, Page 1 of 2

Permit No. 1 W l G$ O"j i%
(to be pr Kfed by DWO)
II. DESIGN INFORMATION
Drawdown Calculations
Treatment volume drawdown time
2.76
days
Treatment volume discharge rate
D.03
W/s
Pre -development 1-yr, 24-hr discharge
2.72
h /s
Post -development 1-yr, 244 discharge
0.&6
ft'/s
Additional Information
Diameter of orifice
1.00
in
Design TSS removal
90
%
Basin side slopes
3
:1
Vegetated shelf slope
10
.1
Vegetated shelf width
10
it
Length of 0owpath to width ratio
3
:1
Length to width ratio
2
:1
Trash rack for overflow & orifice?
Y
(Y or N)
Freeboard provided
2
It
Vegetated fitter provided?
N
(Y or N)
Recorded drainage easement provided?
Y
(Y or N)
Capures all nmoff at ultimate build -out?
Y
(Y or N)
Drain mechanism for mmntenance or emergencies
Pump
OK
OK
OK
OK
OK
OK
OK
OK
OK
OK
Design must be based on 90%TSS removal
OK
OK
Forth SW401-Wet Detention Basm-Rev.2 Parts I_ & IL Design Summary, Page 2 of 2

PermitNo._SW2 p%oS17
(to be provided by DWQ)
Ill ARE UIRED �ITEMS'CHECKLISTf
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.
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.
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.
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.
-
t 4.
If the basin is used for sediment and erosion control during construction, dean out of the basin is specified
on the plans prior to use as a wet detention basin.
COL
C` LVL91°U5 5.
A table of elevations, areas, incremental volumes & accumulated volumes for overall pond and for forebay,
to verify volume provided.
Cam((
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.
7.
A construction sequence that shows how the wet detention basin will be protected from sediment until the
entire drainage area is stabilized.
i
LvLAQciNs 8.
The supporting calculations.
��.
0e�(9.
A copy of the signed and notarized inspection and maintenance (I&M) agreement.
L k 10.
A copy of the deed restriction.
Form SW401-Wet Detention Basin-Rev.1 Pan 111. Required Items Checklist, Page 1 of

t r�,
ATA
NCDENR
Pend Numbef—yuLU��
(to be provided by DWQ)
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATION APPLICATION FORM
SAND FILTER SUPPLEMENT
This form must be filled out on line, printed and submitted with all of the required information.
Make sure to also fill out and submit the Required Items Checklist (Section Ill) and the I dM Agreement (Section IV)
I. PROJECT INFORMATION
Project name
Covil Gardens
Contact name
Phil Tripp, P.E.
Phone number
910-763-5100
Date
Drainage area number
H. DESIGN INFORMATION
Site Characteristics
Drainage area (AD)
Impervious area
% Impervious (IA)
Design rainfall depth (Ro)
Peak Flow Calculations
1-yr, 24-hr runoff depth
1-yr, 24-hr intensity
Pre -development 1-yr, 24-hr runoff
Post -development 1-yr, 24-hr runoff
Pre/Post 1-yr, 24-hr peak control
Storage Volume
Design volume (WOV)
Adjusted water quality volume (WOVE
Volume contained in the sedimentation basin and on top of the sand filter
Top of sand filter/grate elevation
Weir elevation (between chambers)
Maximum head on the sedimentation basin and sand fitter (h.,,F�)
Average head on the sedimentation basin and sand filter (hA)
Runoff Coefficient (Rv)
Type of Sand Filter
Open sand fifteR
SHWT elevation
Bottom of the sand filter elevation
Clearance (dam)
Closed/pre-cast sand filter?
SHWT elevation
Bottom of the sand filter elevation
Clearance (dam)
If this is a dosed, underground dosed sand fiker. The clearance between
the surface of the sand filter and the bottom of the roof of the underground
structure (ds.)
May 11, 2011
1
10,000.00 it, OK
8,734.00 ftz
87.3% %
1.50 in
3.90
in
4.87
in/hr
0.28
ft /sec
1.00
ft/sec
0.72
fe/sec
1,047.00 ft3
785.25 ft' OK
790.40 ft
32 it amsl
32.3 ft amsl f,
1.30 ft �asusftsieRFdeptlr. N /r l
0.65 it OK
0.84 (uni8ess)
YorN
ft amsl
ft amsl
y YorN
28.50 It amsl
30.50 It artist
2.00
1.80 it CEIVED
— 7__
AY 12 2oil
Form SW401 Sand Fitter-Rev.5 2009Sept17 Parts I and II. Project Design Summary, Page t of 2

Permit Number:
(to be provided by DWQ)
Sedimentation Basin
Surface area of sedimentation basin (As)
Sedimentation basin/chamber depth
Sand Filter
Surface area of sand filter (AF)
Top of sand media fitter bed elevation
Bottom of sand media filter bedidrain elevation
Depth of the sand media filter bed (dF)
Coefficient of permeability for the sand filter (k)
Outlet diameter
Outlet dischargeMowrate
Time to drain the sand filter (t)
Time to drain the sand filter (t)
Additional Information
Does volume in excess of the design volume bypass the sand fitter?
Is an off-line flow -splitting device used?
If draining to SA waters: Does volume in excess of the design volume flow
evenly distributed through a vegetated filter.?
What is the length of the vegetated filter?
Does the design use a level spreader to evenly distribute flow?
Is the BMP located at least 30R from surface waters (50R'rf SA waters)?
If not a dosed bottom, is BMP located at least 100R from water supply wells?
Are the vegetated side slopes equal to or less than 3:1
Is the BMP located in a recorded drainage easement with a recorded access
easement to a public Right of Way (ROW)?
What i; the width of the sedimentation chamber/forebay (Wsd)?
What is the depth of sand over the outlet pipe (dpipe)?
304.00 ft2 OK. Meets minimum, but may need to be increased to
1.50 It
304.00 ftZ
32.00 it amsl
30.50 it amsl
1.50 it
3.55 (ft/day)
6.00 in
0.91 ft'Isec
0.23 hours OK. Submit drainage calculations.
0.01 days
y YorN OK
y Y or N OK
NIA Y or N Enter Data
it
YorN
y YorN
NIA Y or N
NIA Y or N
Y
4.00 ft
1.50 it
OK
Enter Data
Insufficient vegetated side slopes.
YorN OK
OK
OK
MAY 12 Z011
Fonn SW401-Sand Filter-Rev.5 2009Sept17 Parts I and 11. Project Design Summary, Page 2 of 2