SW3240801_O&M Agreement/Plan_20240814

Operation & Maintenance Agreement
Project Name: Adelina Phase 1
Project Location: Town of Waxhaw
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: 4 Location(s): SCM 1, SCM 2, SCM 4, SCM 5
Stormwater Wetland Quantity: Location(s):
Permeable Pavement Quantity: Location(s):
Sand Filter Quantity: 1 Location(s): SCM 3
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: 1 Location(s): SCM 3
Disconnected Impervious Surface Present: No Location(s):
User Defined SCM Present: No Location(s):
Low Density Present: No 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: Jay Seymoure
Title & Organization: Shea Homes Carolina, LLC -Vice President
Street address: 10130 Perimeter Parkway Suite 300
City, state, zip: Charlotte, NC, 28216
Phone number(s): [phone]
Email: [e-mail]
Signature: Date: ?//472Y
Tvcc y ,nk , a Notary Public for the State of 404 .aic\,s no,
County of ega.40n , do hereby certify that 50.1 SQ.lrYlOW«
S(,>�\personally appeared before me this at day of ' 1 and
acknowledge the due execution of the 0 erations and Maintenance Agreement'.
Witness my hand and official seal
-7 � Notary Public <
Gaston
County
My Comm. Exp.
11-13-2028 Q-\
Seal My commission expires 11-13'a6a8
STORM-EZ 7/29/2024
Version 1.5 O&M Agreement Page 1 of 10

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 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
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.
1

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.
The main treatment area Algal growth covers over Consult a professional to remove and control the algal growth.
50% of the area. g
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.
or dying. Provide 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
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.
1

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.
1

Wet Detention Pond Design Summary
Wet Pond Diagram
WET POND ID FOREBAY MAIN POND
SCM 1 Permanent Pool El. 546.5 Permanent Pool El. 546.5
Temporary Pool El: 547.77 Temporary Pool El: 547.77
Pretreatment other No Clean Out Depth: 4.5 Clean Out Depth: 7.5
than forebay? Sediment Removal E 542 Sediment Removal E 539
Has Veg. Filter? No Bottom Elevation: 541 Bottom Elevation: 538
WET POND ID FOREBAY MAIN POND
SCM 2 Permanent Pool El. 510.5 Permanent Pool El. 510.5
Temporary Pool El: 511.58 Temporary Pool El: 511.58
Pretreatment other No Clean Out Depth: 4.5 Clean Out Depth: 7.5
than forebay? Sediment Removal E 506 Sediment Removal E 503
Has Veg. Filter? No Bottom Elevation: 505 - Bottom Elevation: 502
WET POND ID FOREBAY MAIN POND
SCM 4 Permanent Pool El. 523.5 Permanent Pool El. 535.5
Temporary Pool El: 524.6 Temporary Pool El: 524.6
Pretreatment other No Clean Out Depth: 4.5 Clean Out Depth: 18.5
than forebay? Sediment Removal E— 519 Sediment Removal E 517
Has Veg. Filter? No Bottom Elevation: 518 Bottom Elevation: 516
WET POND ID FOREBAY MAIN POND
SCM 5 Permanent Pool El. 547.5 Permanent Pool El. 547.5
Temporary Pool El: 548.4 Temporary Pool El: 548.4
Pretreatment other No Clean Out Depth: 5.5 Clean Out Depth: 9.5
than forebay? Sediment Removal E 542 Sediment Removal E 538
Has Veg. Filter? No Bottom Elevation: 541 Bottom Elevation: 537
ATTACH ADDITIONAL SHEETS IF NECESSARY
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Sand Filter Maintenance Requirements
Important operation and maintenance procedures:
- Manage the drainage area to reduce the sediment load to the sand filter.
- Clean out the sedimentation chamber or forebay whenever sediment depth exceeds six inches.
- At least once a year, skim the sand media
- Replace the sand filter media whenever it fails to function properly after maintenance.
After the sand filter is established, it shall 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:
Entire sand filter Trash/debris is present. Remove the trash/debris.
Adjacent pavement (if Sediment is present on the
applicable) pavement surface. Sweep or vacuum the sediment as soon as possible.
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-
The perimeter of the sand formed. time fertilizer application.
filter
Vegetation is too short or Maintain vegetation at an appropriate height.
too long.
The structure is clogged. Unclog the structure and dispose of sediment in a location where
The flow diversion it will not cause impacts to streams or the SCM.
structure (if applicable) The structure is damaged. Make any necessary repairs or replace if the damage is too much
for repair.
The inlet pipe is clogged (if Unclog the pipe and dispose of sediment in a location where it will
applicable). not cause impacts to streams or the SCM.
The inlet pipe is cracked or
otherwise damaged (if Repair or replace the pipe.
applicable).
The inlet device 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.
Stone verge is clogged or Remove sediment and clogged stone and replace with clean
covered in sediment (if stone.
applicable).
Sediment has accumulated Search for the source of the sediment and remedy the problem if
to a depth of greater than possible. Remove the sediment and dispose of it in a location
six inches. where it will not cause impacts to streams or the SCM.
Sediment chamber
(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 a pesticide is used,
wipe it on the plants rather than spraying.
1

Sand Filter Maintenance Requirements (continued)
SCM element: Potential problem: How to remediate the problem:
Sand chamber and Water is ponding on the Check to see if the collector system is clogged and flush if
underdrain collection surface for more than 24 necessary. If water still ponds, remove the top few inches of filter
system hours after a storm. bed media and replace. If water still ponds, then consult an
appropriate professional.
Clogging has occurred. Clean out the outlet device and dispose of sediment in a location
gg g 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.
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 sand
filter are causing erosion or Contact the local NCDEQ Regional Office.
sedimentation in the
receiving water.
1

Dry Pond Maintenance Requirements
Important operation and maintenance procedures:
- The drainage area will be managed to reduce the sediment load to the dry pond.
- Immediately after the dry pond is established, the vegetation will be watered twice weekly if needed until
the plants become established (commonly six weeks).
- After the initial fertilization to establish vegetation in the dry pond, fertilizer will not be applied to the dry
pond.
- The vegetation in and around the basin will be maintained at a height of approximately six inches.
- At least once annually, a dam safety expert will inspect the embankment. Any problems that are found
will be repaired immediately.
After the dry pond is established, it shall 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 SCM Trash/debris is present. Remove the trash/debris.
Areas of bare soil and/or Regrade the soil if necessary to remove the gully, plant ground
The perimeter of the SCM 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 in a location where it
applicable). will not cause impacts to streams or the SCM.
The inlet pipe is cracked or
The inlet device 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 Search for the source of the sediment and remedy the problem if
to a depth greater than the possible. Remove the sediment and dispose of it in a location
original design depth for where it will not cause impacts to streams or the SCM.
sediment 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.
Sediment has accumulated Search for the source of the sediment and remedy the problem if
to a depth greater than the possible. Remove the sediment and dispose of it in a location
original design depth for where it will not cause impacts to streams or the SCM.
sediment storage.
The main treatment area Water is standing more Check the outlet structure for clogging. If it is a design issue,
than 5 days after a storm consult an appropriate professional.
event.
Weeds and noxious plants Remove the weeds, preferably by hand. If pesticide is used, wipe
are growing in the main it on the plants rather than spraying.
treatment area.

Dry Pond Maintenance Requirements (continued)
SCM element: Potential problem: How to remediate the problem:
Shrubs have started to Remove shrubs immediately.
grow on the embankment.
Evidence of muskrat or Consult a professional to remove muskrats or beavers and repair
beaver activity is present. 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 Make all needed repairs immediately.
shows that the
embankment needs repair.
Clogging has occurred. Clean out the outlet device. Dispose of the sediment in a location
gg g 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
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 dry
pond are causing erosion Contact the local NCDEQ Regional Office.
or sedimentation in the
receiving water.
1

Dry Detention Pond Design Summary
Dry Pond Diagram
DRY POND ID FOREBAY MAIN POND
SCM 3 Temporary Pool El: 554.87 Temporary Pool El: 554.87
Clean Out Depth: 0.87 Clean Out Depth: 0.87
Pretreatment No Sediment Storage El: 554 Sediment Storage El: 554
Has Veg. Filter No Bottom Elevation: 554 Bottom Elevation: 554
1