HomeMy WebLinkAboutSW5200602_O&M Agreement_20200622Project Name: Wake Electric
Project Location: 228 Park Ave Youngsville, Franklin County, NC 27596
Maintenance records
shall
be Kept
on
the
following
t4Mt'(S).
I
hIS 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 &comes
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:
onding
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):
2
1
0
No
No
I be adtled automaticall
and 1, and 2
and 1-southeast
corner of
ro'ect
site
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:
Chris Wright
Manager of Engineering
228 Park Ave.
Youngsville, NC 27596
979-863-6385 919.418-5709
Chris.Wrig ht@wemc.com
����. �, !'ir���gn � , a Notary Public for the State of
County of in/.4kE , do hearby certify that �R/J kJR/6lfi
personally appeared before me this D r day of �%I/NE and
acknowledge the due execution of the Operations nd Maint once Agreement .
Witness my_ official seal,
y aLXBt►�
�Ta9y
.«»
Version 1.4
My commission expires /�" '•/ice ` �02 f � siaizo2o
Page 1 of 6
Important maintenance procedures
- The drainage area will be managed to reduce the sediment load to the dry extended detention basin.
- Immediately after the dry extended detention basin is established, the vegetation will be watered twice weekly if needed
until the plants become established (commonly six weeks).
- No portion of the dry extended detention pond will be fertilized after the first initial fertilization that is required to establish
the vegetation.
The vegetation in and around the basin will be maintained at a height of approximately six inches.
If cracks, seepage, or woody vegetation is present, consult a dam safety expert for a dam inspection.
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 dry detention basin is established, it will be inspected quarterly. Inspection activities shall be performed as follows and
any problems identified will be remediated immediately per the table below.
BMP element:
Potential problem:
How to 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
Trash/debris is present.
Remove the trash/debris.
Erosion has occurred or
Provide additional erosion protection such as reinforced turf matting or
riprap is displaced.
riprap if needed to prevent future erosion problems.
Weeds are present.
Remove the weeds, preferably by hand. If pesticides are used, wipe
them on the plants rather than spraying.
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Version 1.4 O&M Manual Page 3 of 6
BMP element:
Potential problem:
How to remediate the problem:
The main treatment area
Sediment has accumulated
Search for the source of the sediment and remedy the problem if
and reduced the depth to 75 %
possible. Remove the sediment and dispose of it in a location where it
of the original design depth
will not cause impacts to streams or the BMP. Revegetate disturbed
(per pond design data sheet)
areas immediately with sod (preferred) or seed protected with securely
staked erosion mat.
Water is standing more than
Check outlet structure for clogging. If it is a design issue, consult an
5 days after a storm event.
appropriate professional.
Weeds and noxious plants
Remove the plants by hand or by wiping them with pesticide (do not
are growing in the main
spray).
treatment area.
The embankment
Shrubs or trees have started
Remove shrubs or trees immediately.
to grow on the embankment.
Grass cover is unhealthy or
Restore the health of the grass cover — consult a professional if
eroding.
necessary.
Signs of seepage on the
Consult a professional.
downstream face.
Evidence of muskrat or
Use traps to remove muskrats and consult a professional to remove
beaver activity is present.
beavers.
An annual inspection by an
Make all needed repairs.
appropriate professional
shows that the embankment
needs repair.
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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Version 1.4 O&M Manual Page 4 of 6
Dry Detention Pond Design Summary_
Pretreatment
Has Vag. Filler
Pretreatment
Has Vag. Filler
Temporary Pool El:
Clean Out Depth:
Yes Sediment Storage EI:
No Bottom Elevation:
Temporary Pool EI:
Clean Out Depth:
Yes Sediment Storage EI:
No Bottom Elevation:
442
2
444
442
442
2
444
442
Temporary Pool El:
Clean Out Depth:
Sediment Storage El:
Bottom Elevation:
Temporary Pool EI:
Clean Out Depth:
Sediment Storage EI:
Bottom Elevation:
442
1.5
443.5
442
442
1.7
443.7
442
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Version 1.4 O&M Manual Page 5 of 6
Sand Filter Maintenance Requirements
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 1.6
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 riprap 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
possible. Remove the sediment and stabilize or dispose of it in a
inches.
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 pending 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.
STORM-EZ 6/6/2020
Version 1.4 O&M Manual Page 6 of 6