SW6231109_O&M Agreement/Plan_20240315

Operation & Maintenance Agreement
Project Name: Barker Laydown Yard
Project Location: Cumberland County, NC
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.
Any deficient SCM 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 SCM(s).
The SCM(s)on this project include(check all that apply&corres onding O&M sheets will be added automatically):
Infiltration Basin Quantity: 0 Location(s):
Infiltration Trench Quantity: 0 Location(s):
Bioretention Cell Quantity: 0 Location(s):
Wet Pond Quantity: 0 Location(s):
Stormwater Wetland Quantity: 0 Location(s):
Permeable Pavement Quantity: 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: 1 Location(s): South end of project area
Proprietary System Quantity: 0 Location(s):
Treatment Swale Quantity: 0 Location(s):
Dry Pond Quantity: 0 Location(s):
Disconnected Impervious Surface Present: Yes Location(S): North end of project area
User Defined SCM Present: No Location(s):
Low Density Present: Yes Type:lVegetated swaleslroadside ditches
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: Duke Energy Progress, LLC
Title&Organization: Nuwan Wijesuriya-Lead Transmission Permitting Manager
Street address: 411 Fayetteville Street
City, state, zip: Raleigh, NC, 27601
Phone number(s): 919-546-2090
Email:I [e-mail]
M
Signature: -- �- Date:
I, f a Notary Public for the State of /lIyr A t�jfa�
County of 10 m 64 n CC do hereby certify that ,n(,d W A h W) I?S L4 n 1,�A-
personally appeared before me this 2� � day of dovem 6-W and
acknowledge the due execution of the Operations and Maintenance Agreement.
Witness rr o and jand official seal
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'��''��•�62ary 10,ILI • s''
Seal My commission expires
STORM-EZ 11/20/2023
Version 1.5 O&M Agreement Page 1 of 1

Low Density Maintenance Requirements
Important maintenance procedures:
The drainage area to the vegetated conveyance or vegetated receiving area will be carefully managed to
reduce the sediment load to the vegetated conveyance or vegetated receiving area.
After the initial fertilization to establish the grass in the vegetated conveyance or the vegetated receiving
area,fertilizer will not be applied to the vegetated receiving areas.
The vegetated conveyance or vegetated receiving area will be inspected quarterly. 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.
SCM element: Potential problem: How to remediate the problem:
Vegetation Vegetation is too short or Maintain grassed vegetation such that the swale or vegetated
too long. area does not erode during the peak flow from the 10-year storm
Trash/debris is present. Remove the trash/debris.
Areas of bare soil and/or Regrade the soil if necessary to remove the gully, and then re-sod
erosive gullies have (or plant with other appropriate species)and water until
Vegetated receiving areas formed. established. Provide lime and a one-time fertilizer application.
Trees and/or other woody Remove the trees and woody vegetation from the swale, regrade
vegetation are present in the swale if necessary and re-establish grass as shown on the
the swale. approved plans.
Trash/debris is present. Remove the trash/debris.
Areas of bare soil and/or Regrade the soil if necessary to remove the gully, and then re-sod
erosive gullies have (or plant with other appropriate species)and water until
formed. established. Provide lime and a one-time fertilizer application.
Sediment covers the grass Remove sediment and dispose in an area that will not impact
Vegetated conveyances/ at the bottom of the swale. streams or SCMs. Re-sod if necessary.
swales/roadside ditches Regrade the slopes to the permitted configuration per the
(other than curb outlet The side slope is steeper approved plan and reestablish vegetation. If as-built or existing
swales) than the approved conditions do not allow the slopes to be regraded, contact the
configuration.
applicable permitting agency.
Grass is dead, diseased or Determine the source of the problem: soils, hydrology, disease,
etc. Remedy the problem and replace plants. Provide a one-time
dying. fertilizer application to establish the ground cover if necessary.
Trees and/or other woody Remove the trees and woody vegetation from the vegetated
vegetation are present in conveyance, regrade the vegetated conveyance if necessary and
the vegetated conveyance. re-establish grass as shown on the approved plans.
Clogging has occurred. Clean out the outlet device. Dispose of the sediment off-site.
The outlet device(if
applicable)
The outlet device is Repair or replace the outlet device.
damaged
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 site
are causing erosion or Contact the local NCDEQ Regional Office.
sedimentation in the
receiving water.
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Disconnected Impervious Area Maintenance Requirements
Important operation and maintenance procedures:
The roof area will be maintained to reduce the debris and sediment load to the system. Excess debris
can clog the system and lead to bypass of the design storm, reducing infiltration and pollutant removal.
To ensure proper operation as designed, a licensed Professional Engineer, Landscape Architect, or
other qualified professional will inspect the system annually.
- The system components will be repaired or replaced whenever they fail to function properly.
After the DIS is constructed, it shall be inspected quarterly. 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 contributing Excess debris or sediment
is present on the rooftop or Remove the debris or sediment as soon as possible.
impervious area impervious surface.
Gutters are clogged or Unclog and remove the debris. May need to install gutter screens
water is backing up out of to prevent future clogging.
the gutter system.
The gutter system (if
applicable) Rooftop runoff is not flowing Correct the positioning or installation of the gutters. Replace if
into gutter system. necessary to capture the roof runoff.
Rooftop runoff is causing Install or repair splash blocks as needed.
erosion at outlet.
Runoff flows to the pervious Remove any sediment or obstructions at the pavement-vegetated
area as concentrated flow. area interface.
Roadways & parking lots The aggregate transition
(if applicable) area or concrete edge
restraint is cracked, settled, Repair or replace the transition area or concrete edge restraint.
undercut, eroded or
otherwise damaged.
Areas of bare soil and/or Regrade the soil if necessary to remove the gully, re-seed the
erosive gullies have vegetated receiving area and water until it is established. Provide
formed. lime and a one-time fertilizer application.
The vegetated receiving
area Trees or shrubs have Remove the trees or shrubs.
begun to grow.
Vegetation is too short or Maintain vegetation at a height of approximately three to four
too long. inches.
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Level Spreader-Filter Strip Maintenance Requirements
Important operation and 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).
Stable groundcover will be maintained in the drainage area to reduce the sediment load to the level
spreader-filter strip.
Every two weeks during the growing season, the filter strip will be mowed. Turf grass should not be cut
- shorter than 4-6 inches and may be allowed to grow as tall as 12 inches depending on aesthetic
requirements (NIPC, 1993).
Once a year, the soil will be aerated if necessary and the filter strip will be reseeded to maintain a dense
growth of vegetation.
- Once a year, soil pH will be tested and lime will be added if necessary.
For the fist two years after the LS-FS is established, it 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). After two years of successful performance, it will be
inspected quarterly. 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 LS-IFS Trash/debris is present. Remove the trash/debris.
The flow splitter device is Unclog the conveyance and dispose of any sediment off-site.
The flow splitter device (if clogged.
applicable) The flow splitter device is Make any necessary repairs or replace if damage is too large for
damaged. repair.
The swale is clogged with Remove the sediment and dispose of it off-site.
sediment.
The blind swale
The swale is overgrown Mow vegetation. Regrade and vegetate if the swale has become
with vegetation. silted in.
The level lip is cracked,
settled, undercut, eroded or Repair or replace the lip.
otherwise damaged.
There is erosion around the Regrade the soil to create a berm that is higher than the level lip,
end of the level spreader plant ground cover and water until it is established. Provide lime
The level spreader that show stormwater has and a one-time fertilizer application.
bypassed it.
Trees or shrubs have
begun to grow on the swale Remove the shrubs or trees.
or just downslope of the
level lip.
Areas of bare soil and/or Regrade the soil if necessary to remove the gully, plant ground
erosive gullies have cover and water until it is established. Provide lime and a one-
formed. time fertilizer application.
The bypass channel
Turf reinforcement is Study the site to see if a larger bypass channel is needed (enlarge
damaged or ripap is rolling if necessary). After this, reestablish the erosion control material.
downhill.
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Level Spreader-Vegetated Filter Strip Maintenance Requirements (continued)
SCM element: Potential problem: How to remediate the problem:
Grass is too short or too Maintain grass at a height of approximately three to six inches.
long.
Areas of bare soil and/or Regrade the soil if necessary to remove the gully, plant ground
erosive gullies have cover and water until it is established. Provide lime and a one-
formed. time fertilizer application.
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.
Grass is dead, diseased or Determine the source of the problem: soils, hydrology, disease,
The filter strip etc. Remedy the problem and replace plants. Provide a one-time
dying. fertilizer application to establish the ground cover if necessary.
Determine the source of the problem: soils, hydrology, disease,
etc. Remedy the problem and replace plants. Provide a one-time
Plants are dead, diseased fertilizer application to establish the ground cover if a soil test
or dying. indicates it is necessary. If sod was used, check to see that it was
not grown on clay or impermeable soils. Replace sod if
necessary.
Nuisance vegetation is Remove vegetation by hand if possible. If pesticide is used, do
choking out the grass. not allow it to get into the receiving water.
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 LS-FS
are causing erosion or Contact the local NCDEQ Regional Office.
sedimentation in the
receiving water.
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