SWA000022__08 Operations and Maintenance Agreement - Signed_5/19/2020

0 eration & Maintenance Agreement
Project Name: Courtyards at Emerald Lake
Project Location: 15 Avalon Place, Stallings, NC 28104
Maintenance records shall be kept on the following BMP(s). This maintenance record shall 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 pollutant removal efficiency of the BMP(s).
The BMP(s) on this project include (check all that apply & cc
Bioretention Cell
Quantity:
Dry Detention Basin
Quantity:
Grassed Swale
Quantity:
Green Roof
Quantity:
Infiltration Basin
Quantity:
Infiltration Trench
Quantity:
Level Spreader/VFS
Quantity:
Permeable Pavement
Quantity:
Proprietary System
Quantity:
Rainwater Harvesting
Quantity:
Sand Filter
Quantity:
Stormwater Wetland
Quantity:
Wet Detention Basin
Quantity:
Disconnected Impervious Area
Present:
User Defined BMP
Present:
ding O&M tables will
Location(s):
Location(s):
Location(s):
Location(s):
Location(s):
Location(s):
Location(s):
Location(s):
Location(s):
Location(s):
Location(s):
Location(s):
Location(s):
Location(s):
Location(s):
ne aaaea automaticall
[Avalon Place I
I acknowledge and agree by my signature below that I am responsible for the performance of the maintenance procedures listed for
each BMP above, and attached O&M tables. I agree to notify NCDENR of any problems with the system or prior to any changes to
the system or responsible party.
Signature:
* Responsible Party:
Title & Organization:
Street address:
City, state, zip:
Phone number(s):
Email:
Bob Kardos
Regional President/EPCON Communities Carolinas
11020 David Te ier Drive, Suite 105
Charlotte, NC 28262
704.997-8316
bka rdos@epconcommunities
We Date:
a Notary Public for the State of
County of do hearby certify that r �I b{t7�
personally appeared before me this day of fNN QL4 and
acknowledge the due execution of the O erations and Maintenance Agreement .
Witness my hand and official seal,
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STORM-E2
Version 1.4
ly commission expires !- Dna
O&M Manual
5/6/2020
Page 1 of 4

Wet Detention Pond Maintenance Requirements
The wet detention basin system is defined as the wet detention basin, pretreatment including forebays and the vegetated filter if
one is provided.
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 present. lRemove the trash/debris.
The perimeter of the BMP Areas of bare soil and/or
erosive gullies have formed
The inlet device
The forebay
The vegetated shelf
Vegetation is too short or too
long.
The pipe is clogged,
The pipe is cracked or
otherwise damaged.
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.
Maintain vegetation at a height of approximately six inches.
Unclog the pipe. Dispose of the sediment off -site.
Replace the pipe.
Erosion is occurring in the
Regrade the swale if necessary to smooth it over and provide erosion
swale.
control devices such as reinforced turf matting or riprap to avoid future
problems with erosion.
Stone verge is clogged or
Remove sediment and replace with clean stone.
covered in sediment (if
applicable).
Sediment has accumulated to
Search for the source of the sediment and remedy the problem if
a depth greater than the
possible. Remove the sediment and dispose of it in a location where it
original design depth for
will not cause impacts to streams or the BMP.
sediment storage.
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.
Prune according to best professional practices
Best professional practices
show that pruning is needed
to maintain optimal plant
health.
Plants are dead, diseased or
Determine the source of the problem: soils, hydrology, disease, etc.
dying.
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. IRemove
the weeds, preferably by hand. If pesticide is used, wipe it on
the plants rather than spraying
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Version 1.4 O&M Manual Page 2 of 4

- Wet Detention Pond Maintenance Requirements [Continue l
The main treatment area Sediment has accumulated to Search for the source of the sediment and remedy the problem If
a depth greater than the possible. Remove the sediment and dispose of it in a location where it
original design sediment will not cause impacts to streams or the BMP.
storage depth.
Algal growth covers over 50% Consult a professional to remove and control the algal growth.
of the area.
Cattails, phragmites or other
invasive plants cover 50% of
the basin surface.
The embankment Shrubs have started to grow
on the embankment.
Evidence of muskrat or
beaver activity is present.
A tree has started to grow on
the embankment.
An annual inspection by an
appropriate professional
shows that the embankment
needs repair. (if applicable)
The outlet device Clogging has occurred.
The outlet device is damaged
Remove the plants by wiping them with pesticide (do not spray).
Remove shrubs immediately.
Use traps to remove muskrats and consult a professional to remove
beavers.
Consult a dam safety specialist to remove the tree.
Make all needed repairs.
Clean out the outlet device. Dispose of the sediment off -site.
Repair or replace the outlet device.
receiving water Erosion or other signs of 1contact the local NC Department of Environment and Natural
damage have occurred at the Resources Regional Office.
outlet.
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.
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Version 1.4 O&M Manual Page 3 of 4

Wet Detention Pond Design Sumrnar - !
WET POND Ill FOREBAY MAIN POND
Permanent Pool El. 634.5 Permanent Pool El. 634.5
Temporary Pool El: 636.42 Temporary Pool El: 635.42
Pretreatment other No Clean Out Depth: 5.5 Clean Out Depth: 7.5
than forebay? Sediment Removal El: 629 Sediment Removal El: 627
Has Vag. Filter? Yes Bottom Elevation: 1 628 j Bottom Elevation: 626
WET POND fD FOREBAY MAIN POND
_ _ 2 Permanent Pool El. 639.28 Permanent Pool El. 639.28
Temporary Pool El: 640.2 Temporary Pool El: 640.2
Pretreatment other Clean Out Depth: 4.88 Clean Out Depth: 4.88
than forebay? _ Sediment Removal El: 634.4 Sediment Removal El: 634.4
Has Vag. Filter? Yes Bottom Elevation: 633.4 Bottom Elevation: 633A
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Version 1.4 O&M Manual Page 4 of 4