SW4240102_O&M Agreement/Plan_20240524

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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.
!A y deficient
ef:lIG L SCM elements noted II the II I1.JCL.tl VIIl VY:11 be corrected, repaired, or replaced III I C dHiaLGIy. 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: U Location(s):'
Infiltration Trench Quantity: 0 I Location(s):
Bioretention Cell Quantit : 0 Location(s):
Y
Wet Pond Quantity:[ 1 1 Location(s): SOUTH EAST ON SUBJECT PARCEL
- -Stormwater Wetland Quantity:) 0 Location(s):
Permeable Pavement Quantity: I 0 Location(s):
Sand Filter Quantity: 0 Location(s):
Rainwater Harvesting Quantity: 0 Location(s):
Green Roof Quantity: 0 Location(s):
Level Spreader- Filter Strip Quantity: 0 Location(s):
Proprietary System Quantity: 0 Location(s):
Treatment Swale Quantity: 0 I Location(s): '
Dry Pond Quantity: 0 Location(s):
flisconnected Impervious Surface Present' No ' I ncatinn(s):
User Defined SCM Present:I No I Location(s):
I (fly flancity Pracant.l Mn I T)ma.• I i
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: V. Earl Dickinson, Ill
Title & Organization: Manager, L R Pine Ridge Associates II, LLC
Street address:I 4905 Dickens Road, Ste 201
City, state, zip:I Richmond, VA 23230-1953
Phone r- ,mher(cl lQ lAl •l5A- 7"
Email:[e-mail]
Signature:C. Date: 2 / I S/Z3
i, � WV)� 1 Mrs 1- a nlntary Pi Ihlic for the State of v, (‘ I n iCL-
County of APi do herebycertifythat �_G 1'
�� CO�0 U DiCet r\scr) 1 111
personally appeared before me this i `) day of --epic 1 aoa J and
acknowledge the due execution of the Operations and M inten greement .
Witness my hand and official seal, .
CA
'.1 NOTARY ••9
_ 0•• PUBLIC 1:
:. REG.#7044945
3.. .• �
tM EZ My commission expires III 301 aDa Lo 12/14/2023
Version 1.5 O&M Agreement Page 1 of 5

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.
Areas of bare soil and/or Regrade the soil if necessary to remove the gully, plant ground
The perimeter of the wet 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 (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
Search for the source of the sediment and remedy the problem if
to a depth greater than the
original design depth for possible. Remove the sediment and dispose of it in a location
where it will not cause impacts to streams or the SCM.
sediment 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
Search for the source of the sediment and remedy the problem if
to a depth greater than the
original design sediment
possible. Remove the sediment and dispose of it in a location
where it will not cause impacts to streams or the SCM.
storage depth.
The main treatment area Algal growth covers over
50% of the area. Consult a professional to remove and control the algal growth.
Cattails, phragmites or
other invasive plants cover Remove the plants by wiping them with pesticide (do not spray).
50% of the basin surface.
Best professional practices
show that pruning is
Prune according to best professional practices.
needed to maintain
optimal plant health.
The vegetated shelf Determine the source of the problem: soils, hydrology, disease,
Plants are dead, diseased etc. Remedy the problem and replace plants. Provide a one-time
or dying. 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
Remove shrubs immediately.
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 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.

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 or
sedimentation in the Contact the local NCDEQ Regional Office.
receiving water.

Wet Detention Pond Design Summary
Wet Pond Diagram
WET POND ID FOREBAY MAIN POND
1 Permanent Pool El. 907 Permanent Pool El. 907
Temporary Pool El: 909.3 Temporary Pool El: 909.3
Pretreatment No Clean Out Depth: 6.5 Clean Out Depth: 6.5
other than Sediment Removal El 900.5 Sediment Removal El 900.5
Has Veg. Filter? Yes Bottom Elevation: 901 Bottom Elevation: 901
ATTACH ADDITIONAL SHEETS IF NECESSARY