SW3171201_O&M Agreement/Plan_20230810

Operation & Maintenance Agreement
Project Name: Village at Granite - Phase Ill
Project Location: 310 Limestone Terrace, Rowan County, Granite Quarry, NC 2814E
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 & corresponding 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):
Stormwater Wetland Quantity: Location(s):
Permeable Pavement Quantity: Location(s):
Sand Filter Quantity: 0 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: Yes Type: Dispersed flow only
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: Date:
I, , a Notary Public for the State of
County of , do hereby certify that
personally appeared before me this day of and
acknowledge the due execution of the Operations and Maintenance Agreement .
Witness my hand and official seal, .
SCM-EZ My commission expires 8/4/2023
Version 1.5 O&M Agreement Page 1 of 1

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 Areas of bare soil and/or Regrade the soil if necessary to remove the gully, plant ground
wet 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 (i1
Unclog the pipe. Dispose of the sediment off-site.
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 locatioi
design depth for sediment 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.
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 locatioi
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
other invasive plants Remove the plants by wiping them with pesticide (do not
cover 50% of the basin spray).
surface.
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. Provid(
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
grow on the embankment. Remove shrubs immediately.
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 Consult a dam safety specialist to remove the tree.
grow on the embankment.
An annual inspection by
an appropriate
professional shows that Make all needed repairs immediately.
the embankment needs
repair.
Clean out the outlet device and dispose of any sediment in a
Clogging has occurred. 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.
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 Diagram
WET POND ID FOREBAY MAIN POND
1 Permanent Pool El. 754 Permanent Pool El. 754
Temporary Pool El: 755.21 Temporary Pool El: 755.21
Pretreatment No Clean Out Depth: 5 Clean Out Depth: 5
other than Sediment Removal E 749 Sediment Removal E 749
Has Veg. Filter? No Bottom Elevation: 748.5 Bottom Elevation: 748.5
ATTACH ADDITIONAL SHEETS IF NECESSARY

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 is too short or Maintain grassed vegetation such that the swale or vegetated
Vegetation too long. area does not erode during the peak flow from the 10-year
storm
Trash/debris is present. Remove the trash/debris.
Vegetated receiving Areas of bare soil and/or Regrade the soil if necessary to remove the gully, and then re-
areas erosive gullies have sod (or plant with other appropriate species) and water until
formed. established. Provide lime and a one-time fertilizer application.

Clogging has occurred. Clean out the outlet device. Dispose of the sediment off-site.
The outlet device (if
applicable)
The outlet device is
damaged Repair or replace the outlet device.
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.