SW3210401_O&M Agreement_20210415

Operation & Maintenance Agreement
Project Name: I Providence Commons
Project Location: I Union County, North Carolina
Cover Page
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 & co
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:
ng 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):
3e aaaea automatical
North West Side of Development
1 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.
* Responsible Party:
Title & Organization:
Street address:
City, state, zip:
Phone number(s):
Email:
Stephen Rosenburgh
Manager, Providence Commons, LLC
5925 Carnegie Boulevard, Suite 200
Charlotte, NC 28209
704-973-9038
[e-mail]
°ytv Signature: - - =gym - Date: ��2-a d
I, " \ � � i � i� a Notary Public foFt;z
County of r .n�C C V—Q ��, I-LV- c do hearby certify-t
personally appeared before me this day of r [ �.! ? and 1
acknowledge the due execution of the Operations and Maintenance Agreement .
Witness my hand and official seal,
r
4/1/2D21
Page 1 of 5
Version 1.4
O&M Manual

Seal My commission expires w (� 2
IJ-
STORM-EZ 411 /2021
Version 1.4 O&M Manual Page 2 of 5

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.
Remove the trash/debris.
The perimeter of the BMP
Areas of bare soil and/or
Regrade the soil if necessary to remove the gully, and then plant a
erosive gullies have formed.
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 approximately six inches.
long.
The inlet device
The pipe is clogged.
Unclog the pipe. Dispose of the sediment off -site.
The pipe is cracked or
Replace the pipe.
otherwise damaged.
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).
The forebay
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.
The vegetated shelf
Best professional practices
Prune according to 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.
Remove the weeds, preferably by hand. If pesticide is used, wipe it on
the plants rather than spraying.
STORM-EZ
Version 1.4
4/1/2021
O&M Manual Page 3 of 5

Wet Detention Pond Maintenance Requirements (Continued
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
Remove the plants by wiping them with pesticide (do not spray).
invasive plants cover 50% of
the basin surface.
The embankment
Shrubs have started to grow
Remove shrubs immediately.
on the embankment.
Evidence of muskrat or beaver
Use traps to remove muskrats and consult a professional to remove
activity is present.
beavers.
A tree has started to grow on
Consult a dam safety specialist to remove the tree_
the embankment.
An annual inspection by an
Make all needed repairs.
appropriate professional
shows that the embankment
needs repair. (if applicable)
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 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.
STORM-EZ
411 /2021
Version 1.4 O&M Manual Page 4 of 5

Wet Detention Pond Design Summary
-1- - .
WET POND ID
Pretreatment other No
than forebay?
Has Veg. Filter? Yes
FOREBAY
Permanent Pool EI,
Temporary Pool El:
Clean Out Depth:
Sediment Removal El:
Bottom Elevation:
544.5
546.38
7.5
537
536
MAIN POND
Permanent Pool EI,
Temporary Pool EL
Clean Out Depth:
Sediment Removal El:
Bottom Elevation:
544.5
546.38
T5
537
536
STORM-EZ
Version 1.4 O&M Manua[
411/2021
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