SW3170802_O&M Agreement Form_20170802

Project Name:
Project Location:
Weddington Road Subdivision,
Weddington-Matthews Road
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 & corres c
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:
1
Stormwater Wetland
Quantity:
Wet Detention Basin
Quantity:
1
Disconnected Impervious Area
Present:
No
User Defined BMP
Present:
No
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):
on-site
autom
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:
J. Bart Hopper
President / JBH Development,_ LLC
229 East Kingston Ave. _
Charlotte, NC 28203
[phone]
[e-mail]
z
Signature. Date: 711721-7
L. L.twn1 a Notary Public for the State of /lr 'V/
County of iJNI 0 Al do hearby certify that
personally appeared before me this / %7�� day of DULY
acknowledge the due execution ofOp m ions and Mainteennance Agreement .
Witness my hand and official seal,y 1r
774"ZESIt L-
Version 14
®T- A 14AO�L
and
Oy commission expires O c-ro-s!� A / a of 7 7/6/2017
0=1 Manual X Page 1 of 6

Sand Filter Maintenance Requirements a
J
Important maintenance procedures:
- The drainage area will be carefully managed to reduce the sediment load to the sand filter
- The sedimentation chamber or forebay will be cleaned out whenever sediment depth exceeds six inches.
- Once a year, sand media will be skimmed.
- The sand filter media will be replaced whenever it fails to function properly after maintenance.
The sand filter 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 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 problem:
How to remediate the problem:
Entire BMP
Trash/debris is present
Remove the trash/debris.
Adjacent pavement (if
Sediment is present on the
Sweep or vacuum the sediment as soon as possible.
applicable)
pavement surface.
Perimeter of sand filter
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 an appropriate height.
long.
Flow diversion structure
The structure is clogged
Unclog the conveyance and dispose of any sediment offsite
The structure is damaged.
Make any necessary repairs or replace if damage is too large for
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 nprap to avoid future
problems with erosion.
Stone verge is clogged or
Remove sediment and replace with clean stone.
covered in sediment (if
applicable).
Forebay or pretreatment
Sediment has accumulated to
Search for the source of the sediment and remedy the problem if
area
a depth of greater than six
inches.
possible Remove the sediment and stabilize or dispose of it in a
location where 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
Filter bed and underdrain
Water is ponding on the
Check to see if the collector system is clogged and flush if necessary.
collection system
surface for more than 24
If water still ponds, remove the top few inches of filter bed media and
hours after a storm.
replace. If water still ponds, then consult an expert.
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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Wet Detention Pond Maintenance Requirements I
,The wet detention basin system is defined as the wet detention basin, pretreatment including forebays and the vegetated filter if
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 event
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 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 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).
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 where it
original design depth for
will not cause impacts to streams or the BMP
sediment storage
Erosion has occurred
Provide additional erosion protection such as reinforced turf matting or
rlprap 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 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
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Wet Detention Pond Maintenance Requirements (Continued)' i
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 where it
original design sediment
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 not
readily penetrate into accumulated sediments.
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f , a Wet Detention Pond Design Summary
` Wet Pond Diagram
WET POND ID FOREBAY MAIN POND
2 Permanent Pool EI 6895 Permanent Pool EI 6895
Temporary Pool EI 69058 Temporary Pool EI 69058
Pretreatment other No Clean Out Depth 45 Clean Out Depth 45
than forebay? Sediment Removal EI 685 Sediment Removal EI 685
Has Veg Filter? No Bottom Elevation 1 684 Bottom Elevation 1 684
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