SW3210301_O&M Agreement/Plan (Phase 3)_20220215

Operation & Maintenance Agreement
Cresswind - Phase 3
Monroe, NC Union County
Prepared by: Matthew S. Kiker, PE, Thomas & Hutton
on
The BMP(s) on this project include (check all that apply & corresponding O&M tables
Bioretention Cell
Quantity:
Location(s):
Dry Detention Basin
Quantity:
Location(s):
Grassed Swale
Quantity:
Location(s):
Green Roof
Quantity:
Location(s):
Infiltration Basin
Quantity:
Location(s):
Infiltration Trench
Quantity:
Location(s):
Level SpreaderNFS
Quantity:
Location(s):
Permeable Pavement
Quantity:
Location(s):
Proprietary System
Quantity:
Location(s):
Rainwater Harvesting
Quantity:
Locafion(s):
Sand Filter
Quantity:
Location(s):
Stormwater Wetland
Quantity:
Location(s):
Wet Detention Basin
Quantity: 1
Location(s):
Disconnected I mpervious Area
Present: No
Location(s):
Soil Amendments
Present: No
Location(s):
I acknowledge and agree by my signature below that I am responsible for the performance of the maintenance procedures
`Responsible Party:
Title & Organization:
Street address:
City, state, zip:
Phone number(s):
Email:
Mike McLendon
Authorized Signor - KH Wesley Chapel, LLC
8913 Silver Springs Court
Charlotte NC 28215
704-891.6004
[e-mail]
Signature: Date:
personally appearei30gfore me thi
acknowledge the due execution of
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Wet Detention Pond Maintenance Requirements
The wet detention basin system is defined as the wet detention basin, pretreatment including forebays and the vegetated
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
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 BMP
Areas of bare soil and/or
Regrade the soil if necessary to remove the gully, and then plant a
Vegetation is too short or
Maintain vegetation at a height of approximately six inches.
The inlet device
The pipe is clogged.
Unclog the pipe. Dispose of the sediment off -site.
The pipe is cracked or
Replace the pipe.
Erosion is occurring in the
Regrade the swale if necessary to smooth it over and provide
Stone verge is clogged or
Remove sediment and replace with clean stone.
The forebay
Sediment has accumulated
Search for the source of the sediment and remedy the problem if
Erosion has occurred.
Provide additional erosion protection such as reinforced turf
Weeds are present.
Remove the weeds, preferably by hand. If pesticide is used, wipe
The vegetated shelf
Best professional practices
Prune according to best professional practices
Plants are dead, diseased
Determine the source of the problem: soils, hydrology, disease,
Weeds are present.
Remove the weeds, preferably by hand. If pesticide is used, wipe
Wet Detention Pond Maintenance Requirements (Continued)
The main treatment area
Sediment has accumulated
Search for the source of the sediment and remedy the problem if
Algal growth covers over
Consult a professional to remove and control the algal growth.
Cattails, phragmites or
Remove the plants by wiping them with pesticide (do not spray).
The embankment
Shrubs have started to
Remove shrubs immediately.
Evidence of muskrat or
Use traps to remove muskrats and consult a professional to
A tree has started to grow
Consult a dam safety specialist to remove the tree.
An annual inspection by an
Make all needed repairs.
The outlet device
Clogging has occurred.
Clean out the outlet device. Dispose of the sediment off -site.
The outlet device is
Repair or replace the outlet device.
The receiving water
Erosion or other signs of
Contact the local NC Department of Environment and Natural
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.
WET POND ID
1
Pretreatment other No
than forebay?
Has Veg. Filter? No
Wet Detention Pond Design Summary
FOREBAY
Normal Pool El.
567
Temporary Pool El:
568.69
Clean out depth:
4
Sediment Storage El:
563
Bottom El:
562
MAIN POND
Normal Pool El.
567
Temporary Pool El:
568.69
Clean out depth:
4
Sediment Storage El:
563
Bottom El:
562.5