SW5240202_O&M Agreement/Plan_20241014

Operation & Maintenance Agreement
Project Name: WRENN VILLAS
Project Location: NC Highway 96, Youngsville, NC
- Cover Page _
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& co sponding O&M sheets will be added automatically):
Infiltration Basin Quantity: Location(s):
Infiltration Trench Quantity: Location(s):
Bioretention Cell Quantity: Location(s):
Wet Pond Quantity: 1 Location(s): Southern portion of project tract
Stormwater Wetland Quantity: Location(s):
Permeable Pavement Quantity: Location(s):
Sand Filter Quantity: Location(s):
Rainwater Harvesting Quantity: Location(s):
Green Roof Quantity: Location(s):
Level Spreader-Filter Strip Quantity: Location(s):
Proprietary System Quantity: Location(s):
Treatment Swale Quantity: Location(s):
Dry Pond Quantity: Location(s):
Disconnected Impervious Surface Present: No Location(s):
User Defined SCM Present: No Location(s):
Low Density Present:I Yes Type: Vegetated swales/roadside ditches
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: (7
Title&Organization:
Street address:
City, state, zip:
Phone ber(s): /}
Email: f CA"-
­
Signature:Si nature: Date:
L-7L-
a Notary Public for the State of �1C]VAV) ��t►y1
County of on'Al dVu do hereby certify that t a l Vv OL)ok
personally appeared before me this day of -0— //y and
acknowledge the due execution of the Op rations Maintenance A ement.
Witness my hand and official seal,
GABRIELLE MARIE IN ERILLO
Notary Publi
North Carolin
Onslow Count
Yat.� -max sr
Seal My commission expires TAJA �,� SA C.
STORM-EZ 9/5/2024
Version 1.5 O&M Agreement Page 1 of 6

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 Unclog the pipe. Dispose of the sediment off-site.
applicable).
The inlet pipe is cracked
The inlet device or otherwise damaged (if Repair or replace the pipe.
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 location
design depth for sediment where it will not cause impacts to streams or the SCM.
The forebay 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.
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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 location
design sediment storage where it will not cause impacts to streams or the SCM.
depth.
The main treatment area Algal growth covers over Consult a professional to remove and control the algal growth.
50% of the area.
Cattails, phragmites or Remove the plants by wiping them with pesticide (do not
other invasive plants cover
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.
The vegetated shelf Determine the source of the problem: soils, hydrology,
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.
The embankment A tree has started to grow Consult a dam safety specialist to remove the tree.
on the embankment.
An annual inspection by
an appropriate
professional shows that Make all needed repairs immediately.
the embankment needs
repair.
Clogging has occurred. Clean out the outlet device and dispose of any sediment in a
gg g
The outlet device location where it will not cause impacts to streams or the SCM.
The outlet device is Repair or replace the outlet device.
damaged.
Weeds or volunteer trees Remove the weeds or trees.
a
Floating wetland island are growing on the mat.
(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
W-t Pond Diagram
WET POND ID FOREBAY MAIN POND
SCM A Permanent Pool El. 410 Permanent Pool El. 410
Temporary Pool El: 415 Temporary Pool El: 415
Pretreatment other NO Clean Out Depth: 5 Clean Out Depth: 4.5
than forebay? Sediment Removal EI 405 Sediment Removal EI 405.5
Has Veg. Filter? No Bottom Elevation: 404 Bottom Elevation: 404.5
ATTACH ADDITIONAL SHEETS IF NECESSARY
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Low Density Maintenance Requirements
Important maintenance procedures:
The drainage area to the vegetated conveyance or vegetated receiving area will be carefully managed to
reduce the sediment load to the vegetated conveyance or vegetated receiving area.
After the initial fertilization to establish the grass in the vegetated conveyance or the vegetated receiving
area, fertilizer will not be applied to the vegetated receiving areas.
The vegetated conveyance or vegetated receiving area will be inspected quarterly. Records of operation and maintenance
will be kept in a known set location and will 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:
Vegetation Vegetation is too short or Maintain grassed vegetation such that the swale or vegetated
too long. area does not erode during the peak flow from the 10-year storm
Trash/debris is present. Remove the trash/debris.
Areas of bare soil and/or Regrade the soil if necessary to remove the gully, and then re-sod
erosive gullies have (or plant with other appropriate species) and water until
Vegetated receiving areas formed. established. Provide lime and a one-time fertilizer application.
Trees and/or other woody Remove the trees and woody vegetation from the swale, regrade
vegetation are present in the swale if necessary and re-establish grass as shown on the
the swale. approved plans.
Trash/debris is present. Remove the trash/debris.
Areas of bare soil and/or Regrade the soil if necessary to remove the gully, and then re-sod
erosive gullies have (or plant with other appropriate species) and water until
formed. established. Provide lime and a one-time fertilizer application.
Sediment covers the grass Remove sediment and dispose in an area that will not impact
Vegetated conveyances / at the bottom of the swale. streams or SCMs. Re-sod if necessary.
swales / roadside ditches Regrade the slopes to the permitted configuration per the
(other than curb outlet The side slope is steeper approved plan and reestablish vegetation. If as-built or existing
swales) than the approved conditions do not allow the slopes to be regraded, contact the
configuration. applicable permitting agency.
Grass is dead, diseased or Determine the source of the problem: soils, hydrology, disease,
etc. Remedy the problem and replace plants. Provide a one-time
dying. fertilizer application to establish the ground cover if necessary.
Trees and/or other woody Remove the trees and woody vegetation from the vegetated
vegetation are present in conveyance, regrade the vegetated conveyance if necessary and
the vegetated conveyance. re-establish grass as shown on the approved plans.
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Clogging has occurred. Clean out the outlet device. Dispose of the sediment off-site.
The outlet device (if
applicable)
The outlet device is Repair or replace the outlet device.
damaged
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 site
are causing erosion or Contact the local NCDEQ Regional Office.
sedimentation in the
receiving water.
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