SW4210702_O&M Agreement/Plan_20210729

Operation & Maintenance Agreement
Project Name: Southern Alamance Aigh School Additions and Renovations
Project Location:1631 Southern High School Road
Maintenance records shall be kept on the following SCM(s). This maintenance record shall be kept in a log in a known set location
Any deficient SCM 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 SCM(s).
The SCM(s) on this project include (check all that apply & cor
Infiltration Basin
Quantity:
Infiltration Trench
Quantity:
Bioretention Cell
Quantity:
Wet Pond
Quantity:
Stormwater Wetland
Quantity:
Permeable Pavement
Quantity:
Sand Filter
Quantity:
Rainwater Harvesting
Quantity:
Green Roof
Quantity:
Level Spreader - Filter Strip
Quantity:
Proprietary System
Quantity:
Treatment Swale
Quantity:
Dry Pond
Quantity:
Disconnected Impervious Surface
Present:
User Defined SCM
Present:
Low Density
Present:
O&M sheets 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)
Type
I acknowledge and agree by my signature below that.I am responsible for the performance of the maintenance procedures listed for
each SCM above, and attached O&M tables. I agree to notify NCDEQ 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:
Signature:
Facilities
County of Y �`
personally appeared before me this (1
k12.nc.us
, a Notary
, do hereb!
- day of
acknowledge the due execution of the Operations and Maintenance Agreement
Witness my hand and official seal, Q&.
Sue F. Longe
Notary Publi
Randolph Coun
North Carolin
Sea! My commission expires Q Z0 2d 2
STORM. EZ 726/202
Version 1 5 O&M Agreement Page 1 of

Wet Pond _Aaintenance R, ,equiirements..
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 dram 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 1.6 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
erosive gullies have
cover and water until it is established. Provide lime and a one -
pond
formed.
time fertilizer application.
The inlet pipe is clogged
Unclog the pipe. Dispose of the sediment off -site.
(if applicable).
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
Provide additional erosion protection such as reinforced turf
Erosion has occurred.
matting or riprap if needed to prevent future erosion problems
Remove the weeds, preferably by hand. If pesticide is used,
Weeds are present.
wipe it on the plants rather than spraying.

Wet Pond Maintenance. Requirements (Cont nueoj
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.
The main treatment area
50 /o- of the area.
Cattails, phragmites or
other invasive plants cover
Remove the plants by wiping them with pesticide (do not
50% of the basin surface.
spray)
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.
gg g
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
The anchor cable is
(if applicable)
damaged, disconnected or
Restore the anchor cable to its design state
missing.

Wet' Pond_ Maintenance Re ulrements 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.
Discharges from the wet
The receiving water
pond are causing erosion
Contact the local NCDEQ Regional Office
or sedimentation in the
receiving water.

Wet _Detention Pond Mtign Summary
m
WET POND ID
Pond 1
Pretreatment other No
than forebay?
Has Vag. Filter? Yes
Permanent Pool El.
604
Temporary Pool El:
605.5
Clean Out Depth:
4
Sediment Removal E
600
Bottom Elevation:
599
Permanent Pool El.
604
Temporary Pool El:
605.5.
Clean Out Depth:
4
Sediment Removal E
600
Bottom Elevation:
599