SW4200703_17-101 O & M Agreement SIGNED_20200708

Operation & Maintenance Agreement
Project Name: IThe Hawbridge School - New Upper School
Project Location: 11816 Saxapahaw Bethlehem Church Road, Graham, 27253
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 & o
Bioretention Cell
Quantity:
Dry Detention Basin
Quantity:
Grassed Swale
Quantity:
Green Roof
Quantity:
Infiltration Basin
Quantity:
Infiltration Trench
Quantity:
Level SpreaderNFS
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:
2
O&M tables wil
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 Northeast and lower East section of site I
North
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.
* Responsible Party:
Title & Organization:
Street address:
City, state, zip:
Phone number(s):
Email:
Sign
County o
personal)
The Association for the Advancement of Education
M a Ciccotti Geiss, Executive Director
1735 Saxa ahaw Bethlehem Church Road
Saxanahaw.NC 27340
336-376-1122
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acknowledge the due execution of the Operations and Mai tenance Agreement.
W itne0►J.--t. g 11�
ic�a] seal,
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111� 6/23/2020
�(4 My commission expires O&M Manual Page 1 of 8

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Version 1.4 O&M Manual Page 2 of 8

Bioretention Maintenance Requirements
Important operation and maintenance procedures:
- Immediately after the bioretention cell is established, the plants will be watered twice weekly if needed until the plants
become established (commonly six weeks).
- Snow, mulch or any other material will NEVER be piled on the surface of the bioretention cell.
- Wheeled or tracked equipment will NEVER be driven over the bioretention planting surface.
- Special care will be taken to prevent sediment from entering the bioretention cell.
- If standing water is present 2 days after rainfall, conduct an infiltration test of the soil media.
After the bioretention cell is established, inspect it quarterly. Inspection activities shall be performed as follows and maintenance
activites shall commence immediately to remediate any problems observed per the table below.
BMP element:
Potentialproblem:
How to remediate theproblem:
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 to remove the gully, and plant a ground cover and
erosive gullies have formed.
water until it is established. Provide lime and a one-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 to smooth it over and provide erosion control
swale.
devices such as reinforced turf matting or riprap to avoid future
problems.
Stone verge is clogged or
Remove sediment and replace with clean stone.
covered in sediment (if
applicable).
The pretreatment area
Flow is bypassing
Regrade if necessary to route all flow to the pretreatment area.
pretreatment area and/or
Restabilize the area after grading.
gullies have formed.
Sediment has accumulated to
Search for the source of the sediment and remedy the problem if
a depth greater than three
possible. Remove the sediment and restabilize the pretreatment area.
inches.
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.
The bioretention cell:
Best professional practices
Prune according to best professional practices.
vegetation
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 fertilizer
application to establish the ground cover if a soil test indicates it is
necessary.
Tree stakes/wires are present
Remove tree stake/wires (which can kill the tree if not removed).
six months after planting.
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Bioretention Maintenance Re uirements continued
BMP element:
Potentialproblem:
How to remediate theproblem:
The bioretention cell:
Mulch is breaking down or
Spot mulch if there are only random void areas. Replace whole mulch
soils and mulch
has floated away.
layer if necessary. Remove the remaining much and replace with
triple shredded hard wood mulch at a maximum depth of three inches.
Soils and/or mulch are
Determine the extent of the clogging - remove and replace either just
clogged with sediment.
the top layers or the entire media as needed. Dispose of the spoil in
an appropriate off -site location. Use triple shredded hard wood mulch
at a maximum depth of three inches. Search for the source of the
sediment and remedy the problem if possible.
An annual soil test shows that
Dolomitic lime shall be applied as recommended per the soil test and
pH has dropped or heavy
toxic soils shall be removed, disposed of properly and replaced with
metals have accumulated in
new planting media.
the soil media.
The underdrain system
Clogging has occurred.
Wash out the underdrain system.
(if applicable)
The drop inlet
Clogging has occurred.
Clean out the drop inlet. Dispose of the sediment off -site.
The drop inlet is damaged
Repair or replace the drop inlet.
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.
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Level Spreader -Vegetated Filter Strip / Restored Riparian Buffer Maintenance Requirements
Important maintenance procedures:
Immediately after the filter strip is established, any newly planted vegetation will be watered twice weekly if
needed until the plants become established (commonly six weeks).
Once a year, the filter strip will be reseeded to maintain a dense growth of vegetation
- Stable groundcover will be maintained in the drainage area to reduce the sediment load to the vegetation.
Two to three times a year, grass filter strips will be mowed and the clippings harvested to promote the growth of
thick vegetation with optimum pollutant removal efficiency. Turf grass should not be cut shorter than 3 to
5 inches and may be allowed to grow as tall as 12 inches depending on aesthetic requirements (NIPC, 1993).
Forested filter strips do not require this type of maintenance.
- Once a year, the soil will be aerated if necessary.
- Once a year, soil pli will be tested and lime will be added if necessary.
After the filter strip is established, it will be inspected quarterly and within 24 hours after every storm event greater than 1.0
inch (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:
Potentialproblem:
How to remediate theproblem:
'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 one-
time fertilizer a lication.
Vegetation is too short or too
Maintain vegetation at a height of approximately six inches.
long.
The flow splitter device (if
The flow splitter device is
Unclog the conveyance and dispose of any sediment off -site -
applicable)
clogged.
The flow splitter device is
Make any necessary repairs or replace if damage is too large for
damaged.
repair.
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 erosion
swale.
control devices such as reinforced turf matting or riprap to avoid future
roblems with erosion.
Stone verge is clogged or
Remove sediment and replace with clean stone.
covered in sediment (if
applicable).
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LS-VFS / Restored Riparian Buffer Maintenance Requirements Continued
The swale and the level lip
The swale is clogged with
Remove the sediment and dispose of it off -site.
sediment.
The level lip is cracked,
Repair or replace lip.
settled, undercut, eroded or
otherwise damaged.
There is erosion around the
Regrade the soil to create a berm that is higher than the level lip, and
end of the level spreader that
then plant a ground cover and water until it is established. Provide
shows stormwater has
lime and a one-time fertilizer application.
Trees or shrubs have begun
Remove them.
to grow on the swale or just
downslope of the level lip.
The bypass channel
Areas of bare soil and/or
Regrade the soil if necessary to remove the gully, and then
erosive gullies have formed.
reestablish proper erosion control.
Turf reinforcement is
Study the site to see if a larger bypass channel is needed (enlarge if
damaged or ripap is rolling
necessary). After this, reestablish the erosion control material.
downhill.
The filter strip
Grass is too short or too long
Maintain grass at a height of approximately three to six inches.
(if applicable).
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 one-
-time fertilizer a lication.
Sediment is building up on
Remove the sediment and restabilize the soil with vegetation if
the filter strip.
necessary. Provide lime and a one-time fertilizer application.
Plants are desiccated.
Provide additional irrigation and fertilizer as needed.
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 fertilizer
application.
Nuisance vegetation is
Remove vegetation by hand if possible. If pesticide is used, do not
choking out desirable
allow it to get into the receiving water.
species.
The receiving water
Erosion or other signs of
Contact the NCDENR local Regional Office, or the 401 Oversight Unit
damage have occurred at the
at 919-733-1786.
outlet.
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Stormwater Wetland Maintenance Requirements
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 greater
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:
Potentialproblem:
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 one -
'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 where
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 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.
'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 erosion
swale.
control devices such as reinforced turf matting or riprap to avoid future
problems with erosion.
Stone verge is clogged or
Remove sediment and replace with clean stone.
covered in sediment (if
applicable).
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tormwater Wetland Maintenance Rnuirements(Continued)
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 of 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 fertilizer
application to establish the round 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 where
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 where
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.
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