SW4200501_17-116 O&M Manual_20200702

Operation & Maintenance Agreement
Project Name:
Project Location:
Lewisville Middle School
1115 Lewisville -Vienna Road, NC 27023
Cover Page
Maintenance records shall be kept on the following BMP(s). This maintenance record shall be kept in a log in a known set
location. Any deficient BMP 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 BMP(s).
The BMP(s) on this project include (check all that apply & ci
Bioretention Cell
Quantity:
Dry Detention Basin
Quantity:
Grassed Swale
Quantity:
Green Roof
Quantity:
Infiltration Basin
Quantity:
Infiltration Trench
Quantity:
Level Spreader/VFS
Quantity:
Permeable Pavement
Quantity:
Proprietary System
Quantity:
Rainwater Harvesting
Quantity:
Sand Filter
Quantity:
Stormwater Wetland
Quantity:
Wet Detention Basin
Quantity:
Disconnected Impervious Area
Present:
User Defined BMP
Present:
ding O&M tables wii
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):
oe aaaea
I north of stream I
I acknowledge and agree by my signature below that I am responsible for the performance of the maintenance procedures listed
for each BMP above, and attached O&M tables. I agree to notify NCDENR of any problems with the system or prior to any
changes to the system or responsible party.
Signature:
* Responsible Party:
Title & Organization:
Street address:
City, state, zip:
Phone number(s):
Email:
Winston-Salem/Forsyth County Board of Education
Colon Moore
475 Corporate Square Drive
Winston-Salem, NC 27105
336-727-2533
we m oo re@wsfcs. k12. n c. u s
_C_1 Date:
, a Notary Public for the State of
� �I� � r
County of VT)m "h , do hearby certify that i-7 TA on r
personally appeared before me this day of and
acknowledge the due execution of the Operations ar Maintenance Agreement .
Witness mg,�a ,4nd official seal,
041
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j r 5/27/2020
My commission expires O&M Manual j Page 1 of 7

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Important maintenance procedures:
Immediately following construction of the stormwater wetland, bi-weekly inspections will be conducted and
wetland plants will be watered bi-weekly until vegetation becomes established (commonly six weeks).
No portion of the stormwater wetland will be fertilized after the first initial fertilization that is required to establish
the wetland plants.
- Stable groundcover will be maintained in the drainage area to reduce the sediment load to the wetland.
- Once a year, a dam safety expert should inspect the embankment.
After the stormwater wetland is established, it shall be inspected monthly and within 24 hours after every storm event great
than 1.0 inches (or 1.5 inches if in a Coastal County). 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.
BMP element:
Potential roblem:
How I will remediate theproblem:
Entire BMP
Trash/debris is present.
Remove the trash/debris.
The perimeter of the BMP
Areas of bare soil and/or
Regrade the soil if necessary to remove the gully, and then plant a
erosive gullies have formed.
ground cover and water until it is established. Provide lime and a of
time fertilizer application.
Vegetation is too short or too
Maintain vegetation at a height of approximately six inches.
long.
Forebay
Sediment has accumulated in
Search for the source of the sediment and remedy the problem if
the forebay to a depth that
possible. Remove the sediment and dispose of it in a location wher
inhibits the forebay from
it will not cause impacts to streams or the BMP.
Erosion has occurred.
Provide additional erosion protection such as reinforced turf matting
riprap if needed to prevent future erosion problems.
Weeds are present.
Remove the weeds, preferably by hand. If a pesticide is used, wipe
on the plants rather than spraying.
The inlet device
The pipe is clogged.
Unclog the pipe. Dispose of the sediment off -site -
The pipe is cracked or
Replace the pipe.
otherwise damaged.
Erosion is occurring in the
Regrade the swale if necessary to smooth it over and provide erosic
swale.
control devices such as reinforced turf matting or riprap to avoid futt
problems with erosion.
Stone verge is clogged or
Remove sediment and replace with clean stone.
covered in sediment (if
applicable).
RM-EZ 6/2/:

5tormwater wetfana Maintenance He uirements yontinuea
Deep pool, shallow water
Algal growth covers over 50%
Consult a professional to remove and control the algal growth.
and shallow land areas
of the deep pool and shallow
water areas.
Cattails, phragmites or other
Remove invasives by physical removal or by wiping them with
invasive plants cover 50% of
pesticide (do not spray) — consult a professional.
the deep pool and shallow
Shallow land remains flooded
Unclog the outlet device immediately.
more than 5 days after a
storm event.
Plants are dead, diseased or
Determine the source of the problem: soils, hydrology, disease, etc
dying.
Remedy the problem and replace plants. Provide a one-time fertiliz
application to establish the ground cover if necessary.
Best professional practices
Prune according to best professional practices.
show that pruning is needed
to maintain optimal plant
Sediment has accumulated
Search for the source of the sediment and remedy the problem if
and reduced the depth to
possible. Remove the sediment and dispose of it in a location wher
75% of the original design
it will not cause impacts to streams or the BMP.
Embankment
A tree has started to grow on
Consult a dam safety specialist to remove the tree.
the embankment.
An annual inspection by
Make all needed repairs.
appropriate professional
shows that the embankment
Evidence of muskrat or
Consult a professional to remove muskrats or beavers.
beaver activity is present.
Micropool
Sediment has accumulated
Search for the source of the sediment and remedy the problem if
and reduced the depth to
possible. Remove the sediment and dispose of it in a location wher
75% of the original design
it will not cause impacts to streams or the BMP.
The outlet device
Clogging has occurred.
Clean out the outlet device. Dispose of the sediment off -site.
The outlet device is damaged
Repair or replace the outlet device.
The receiving water
Erosion or other signs of
Contact the local NC Department of Environment and Natural
damage have occurred at the
Resources Regional Office.
outlet.
RM-EZ 6/2/,

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The wet detention basin system is defined as the wet detention basin, pretreatment including forebays and the vegetated filter
one is provided.
Important 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 detention pond should be fertilized after the first initial fertilization that is required to
establish the plants on the vegetated shelf.
Stable groundcover should be maintained in the drainage area to reduce the sediment load to the wet detention
basin.
If the basin must be drained for an emergency or to perform maintenance, the flushing of sediment through the
emergency drain should be minimized to the maximum extent practical.
- Once a year, a dam safety expert should inspect the embankment.
After the wet detention pond is established, it should be inspected once a month and within 24 hours after every storm eves
greater than 1.0 inches (or 1.5 inches if in a Coastal County). Records of operation and maintenance should be kept in a
known set location and must be available upon request.
Inspection activities shall be performed as follows. Any problems that are found shall be repaired immediately.
BMP element:
Potential problem:
How I will remediate the problem:
The entire BMP
Trash/debris is present.
Remove the trash/debris.
The perimeter of the BMP
Areas of bare soil and/or
Regrade the soil if necessary to remove the gully, and then plant a
erosive gullies have formed.
ground cover and water until it is established. Provide lime and a of
time fertilizer application.
Vegetation is too short or too
Maintain vegetation at a height of approximately six inches.
long.
The inlet device
The pipe is clogged.
Unclog the pipe. Dispose of the sediment off -site.
The pipe is cracked or
Replace the pipe.
otherwise damaged.
Erosion is occurring in the
Regrade the swale if necessary to smooth it over and provide erosic
swale.
control devices such as reinforced turf matting or riprap to avoid futt
problems with erosion.
Stone verge is clogged or
Remove sediment and replace with clean stone.
covered in sediment (if
applicable).
The forebay
Sediment has accumulated to
Search for the source of the sediment and remedy the problem if
a depth greater than the
possible. Remove the sediment and dispose of it in a location wher
original design depth for
it will not cause impacts to streams or the BMP.
sediment storage.
Erosion has occurred.
Provide additional erosion protection such as reinforced turf matting
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.
The vegetated shelf
Best professional practices
Prune according to best professional practices
show that pruning is needed
to maintain optimal plant
health.
Plants are dead, diseased or
Determine the source of the problem: soils, hydrology, disease, etc
dying.
Remedy the problem and replace plants. Provide a one-time fertiliz
application to establish the ground cover if a soil test indicates it is
necessa; .
Weeds are present.
Remove the weeds, preferably by hand. If pesticide is used, wipe it
on the plants rather than spraying.
RM-EZ
6/2/,

Wet Uetention Pond Maintenance Hequirements (continued)
The main treatment area
Sediment has accumulated to
Search for the source of the sediment and remedy the problem if
a depth greater than the
possible. Remove the sediment and dispose of it in a location whey
original design sediment
it will not cause impacts to streams or the BMP.
storage depth.
Algal growth covers over 50%
Consult a professional to remove and control the algal growth.
of the area.
Cattails, phragmites or other
Remove the plants by wiping them with pesticide (do not spray).
invasive plants cover 50% of
the basin surface.
The embankment
Shrubs have started to grow
Remove shrubs immediately,
on the embankment.
Evidence of muskrat or
Use traps to remove muskrats and consult a professional to removE
beaver activity is present.
beavers.
A tree has started to grow on
Consult a dam safety specialist to remove the tree.
the embankment.
An annual inspection by an
Make all needed repairs.
appropriate professional
shows that the embankment
needs repair. (if applicable)
The outlet device
Clogging has occurred.
Clean out the outlet device. Dispose of the sediment off -site.
The outlet device is damaged
Repair or replace the outlet device.
The receiving water
Erosion or other signs of
Contact the local NC Department of Environment and Natural
damage have occurred at the
Resources Regional Office.
outlet.
The measuring device used to determine the sediment elevation shall be such that it will give an accurate depth reading and nc
readily penetrate into accumulated sediments.
RM-EZ
6/2/:

Wet Detention Pond Design Summary
Wet Pond Diagram
WET POND ID FOREBAY
MAIN POND
SCM #1
Permanent Pool El.
826.5
Permanent Pool El.
826.5
Temporary Pool El:
827.33
Temporary Pool El:
827.33
Pretreatment other No
Clean Out Depth:
4.5
Clean Out Depth:
3.5
than forebay?
Sediment Removal El:
822
Sediment Removal El:
823
Has Veg. Filter? No
Bottom Elevation:
821.5
Bottom Elevation:
I 822.5
STORM-EZ 7/1 /2020
Version 1.4 O&M Manual Page 7 of 7