SW5221102_O&M Agreement/Plan_20230414

Wet Pond Maintenance Requirements
Important operation and 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 pond should be fertilized after the initial fertilization that is required to establish
the plants on the vegetated shelf.
_ Stable groundcover will be maintained in the drainage area to reduce the sediment load to the wet
pond.
If the pond must be drained for an emergency or to perform maintenance, the flushing of sediment
through the emergency drain will be minimized as much as possible.
At least once annually, a dam safety expert will inspect the embankment. Any problems that are
found will be repaired immediately.
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.
After the wet pond is established, it 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 shall be kept in a
known set location and shall be available upon request.
Inspection activities shall be performed as follows. Any problems that are found shall be repaired immediately.
SCM element:
Potential problem:
How to remediate the problem:
The entire wet pond
Trash/debris is present.
Remove the trash/debris.
The perimeter of the wet
Areas of bare soil and/or
Regrade the soil if necessary to remove the gully, plant ground
pond
erosive gullies have
cover and water until it is established. Provide lime and a one -
formed.
time fertilizer application.
The inlet pipe is clogged
(if applicable).
Unclog the pipe. Dispose of the sediment off -site.
The inlet pipe is cracked
or otherwise damaged (if
Repair or replace the pipe.
The inlet device
applicable).
Erosion is occurring in the
Regrade the swale if necessary and provide erosion control
swale (if applicable).
devices such as reinforced turf matting or riprap to avoid future
problems with erosion.
Sediment has
accumulated to a depth
Search for the source of the sediment and remedy the problem
greater than the original
if possible. Remove the sediment and dispose of it in a
design depth for sediment
location where it will not cause impacts to streams or the SCM.
storage.
The forebay
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.

Wet Pond Maintenance Requirements (Continued)
SCM element:
Potential problem:
How to remediate the problem:
Sediment has
accumulated to a depth
Search for the source of the sediment and remedy the problem
greater than the original
if possible. Remove the sediment and dispose of it in a
design sediment storage
location where it will not cause impacts to streams or the SCM.
depth.
Algal growth covers over
Consult a professional to remove and control the algal growth.
p g
The main treatment area
50% of the area.
Cattails, phragmites or
Remove the plants by wiping them with pesticide (do not
other invasive plants cover
spray).
50% of the basin surface.
Best professional
practices show that
pruning is needed to
Prune according to best professional practices.
maintain optimal plant
health.
Determine the source of the problem: soils, hydrology,
The vegetated shelf
Plants are dead, diseased
disease, etc. Remedy the problem and replace plants. Provide
or dying.
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.
Shrubs have started to
Remove shrubs immediately.
grow on the embankment.
Evidence of muskrat or
Consult a professional to remove muskrats or beavers and
beaver activity is present.
repair any holes or erosion.
A tree has started to grow
Consult a dam safety specialist to remove the tree.
The embankment
on the embankment.
An annual inspection by
an appropriate
professional shows that
Make all needed repairs immediately.
the embankment needs
repair.
Clogging has occurred.
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Clean out the outlet device and dispose of any sediment in a
location where it will not cause impacts to streams or the SCM.
The outlet device
The outlet device is
Repair or replace the outlet device.
damaged.
Weeds or volunteer trees
Remove the weeds or trees.
are growing on the mat.
a
Floating wetland island
(if applicable)
The anchor cable is
damaged, disconnected or
Restore the anchor cable to its design state.
missing.

Wet Pond Maintenance Requirements (Continued)
SCM element:
Potential problem:
How to remediate the problem:
Erosion or other signs of
damage have occurred at
Repair the damage and improve the flow dissipation structure.
the outlet.
The receiving water
Discharges from the wet
pond are causing erosion
Contact the local NCDEQ Regional Office.
or sedimentation in the
receiving water.
Wet Detention Pond Design Summary
WET POND ID FOREBAY MAIN POND
SCM #2 Permanent Pool El. 243.5 Permanent Pool El. 243.5
Temporary Pool El: 245.19 Temporary Pool El: 245.19
Pretreatment other NClean Out Depth: 4.5 Clean Out Depth: 6.5
than forebay? O Sediment Removal E 239 Sediment Removal E 237
Has Veg. Filter? No Bottom Elevation: 238 Bottom Elevation: 236
WET POND ID FOREBAY MAIN POND
SCM #3 Permanent Pool El. 253.5 Permanent Pool El. 253.5
Temporary Pool El: 254.95 Temporary Pool El: 254.95
Pretreatment other Clean Out Depth: 3 Clean Out Depth: 7.5
than forebay? ENO Sediment Removal E 250.5 Sediment Removal E 246
Has Veg. Filter?s Bottom Elevation: 249 Bottom Elevation: 245
ATTACH ADDITIONAL SHEETS IF NECESSARY