SW3240305_O&M Agreement/Plan_20240604

Operation & Maintenance Agreement
Project Name: Blackwelder Retail 100kV Substation Project
Project Location: 5606 Blackwelder Rd, Concord, NC 28027
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&corresponding 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:1 0 Location(s):
Rainwater Harvesting Quantity: 0 Location(s):,
Green Roof Quantity: 0 Location(s):
Level Spreader-Filter Strip Quantity: 0 Location(s):
Proprietary System Quantity: 0 Location(s):
Treatment Swale Quantity: 0 Location(s):
Dry Pond Quantity: 0 Location(s):
Disconnected Impervious Surface Present: No Location(s):
User Defined SCM Present: No Location(s):
Low Density Present: Yes Type: Dispersed Flow
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: Vincent Sullivan
Title&Organization: Sr.Trans.Permitting Manager,Duke Energy Carolinas,LLC
Street address: 525 Tyron St.
City,state,zip: Charlotte,NC,28202
Phone number(s): 828-258.4313
Email: vJ nle.sullivan ke-energy.com
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personally appeared before me this S T k day of /77WW(t.A, 2pO zt and
acknowledge the due execution of the 0 erations and Maintenanreement -
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Version 1.5 O&M Agreement Page 1 of 4

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 1 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,
dying. etc. Remedy the problem and replace plants. Provide a one-time
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.
The longitudinal slope Regrade to meet the permitted longitudinal slope as shown on the
exceeds 5%. approved plans.

Curb outlet swales or The swale profile does not Regrade the swale to the approved profile as shown on the
vegetated areas match the approved detail. approved plans.
The length of the swale or Extend the swale to achieve the 100-foot minimum length. If as-
vegetated area is less than built or existing conditions do not allow the slopes to be regraded,
100 feet. contact the applicable permitting agency.
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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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