SW5231001_O&M Agreement/Plan_20231008

Operation & Maintenance A ! reement
Project Name: Raleigh-Durham International Airport Park Economy 3 Expansion
Project Location: 1020 National Guard Drive Morrisville, NC 27560
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: 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: Yes Location(s): Drainage Areas 1, 2, 3, 4, 5, 6, 7
Low Density Present: No Type:
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: Michael J. Landguth
Title& Organization: President& CEO, Raleigh-Durham Airport Authority
Street address: 1000 Trade Drive
City, state, zip: RDU Airport, NC 27623
Phone number(s): 919-840-7702
Email: [e-mail]
Signature: (� i��, Date: i j 2 i l 7o2.3
I, r -P-Pck r ) {)• 13 ( , a Notary Public for the State of N�fh CctrO 1 i ra,
County of J 9 VL- I , do hereby certify that m ► Chet Q. l LekinCAn Li`}4m
personally appeared before me this :_2 I S4- day of S - m h(�y A(9 3 and J
acknowledge the due execution of the Operations and Maintenance Agreement.
Witness my hand and official seal, 4::j-k
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STORM-EZ 9/20/2023
Version 1.5 O&M Agreement Page 1 of 1

User Defined SCM Maintenance Requirements
Section 1
Important operation and maintenance procedures:
Immediately after the SGW is established,the plants will be watered twice weekly if needed until the
-plants become established as well(commonly six weeks)
- Snow,mulch or any other material will NEVER be piled on the surface of the SGW.
-Heavy equipment will NEVER be driven over the SGW.
-Special care will be taken to prevent sediment from entering the SGW.
The system will be inspected at least quarterly.Records of operation and maintenance will be kept in a known set location I
Section 2
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 BMP Trash/debris is present. Remove the trash/debris.
The perimeter of the SGW Areas of bare soil and/or Regrade the soil if necessary to remove the gully,and then plant a
erosive gullies have ground cover and water until it is established.Provide lime and a
formed. one-time fertilizer application.
The inlet device:pipe, The pipe is clogged(if Unclog the pipe.Dispose of the sediment off-site.
stone verge or swale applicable).
The pipe is cracked or Replace the pipe.
otherwise damaged(if
applicable)
Erosion is occurring in the Regrade the swale if necessary to smooth it over and provide
swale(if applicable). erosion control devices such as reinforced turf matting or riprap to
avoid future problems with erosion.
The forebay area Flow is bypassing forebay Reconstruct if necessary to route all flow to the forebay area.
area and/or gullies have Restabilize the area after grading.
formed.
'Sediment has accumulated Search for the source of the sediment and remedy the problem if
to a depth greater than possible.Remove the sediment and restabilize the forebay area.
three inches.
Erosion has occurred. Provide additional erosion protection such as reinforced turf
matting or additional riprap if needed to prevent future erosion
problems.
•Weeds are present. Remove the weeds,preferably by hand.
The SGW:vegetation Best professional practices Prune according to best professional practices.
show that pruning is
needed to maintain optimal
plant health.
'Plants are dead,diseased Determine the source of the problem:soils,hydrology,disease,
or dying. etc.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 and other invasive Remove the weeds and other invasive species,preferably by
species are present. hand.
The SGW:soils and stone Soils are clogged with Determine the extent of the clogging-remove and replace either
media sediment. just 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
Sediment has surrounded Remove sedimentation.Vacuum out riser tubes if necessary.
riser tubes
Standing water present Determine reason for slow drainage.Rake SGW soil if plants
after 96 hours or water is have not been thoroughly established to removed algae growth if
discolored present.If plants have established,flush underdrain system
through cleanouts with clean water and monitor for sediment in
outfall structure
Embankment Trees are establishing and Remove trees and grind stump(if necessary).Regrade,establish
weakening the structure of turf as needed to repair area.Additional compaction may be
the embankment. required.
Animals are burrowing Trap and remove animal for relocation.Assess and fill burrow
holes,leading to holes.Consultant geotechnical engineer for recommendations.
passageways for water to
potentially travel through
the embankment and cause
it to fail.
Side slopes and Regrade the embankment and compact the area as necessary.
embankments have Reestablish turf with turf matting or other methods.
observed erosion and
_undercutting.
The underdrain system(if Clogging has occurred. Wash out the underdrain system.
applicable)
The drop inlet Trash rack is clogged Remove and dispose of trash
Clogging has occurred. Clean out the drop inlet.Dispose of the sediment off-site.
The receiving water The drop inlet is damaged Repair or replace the drop inlet.
Erosion or other signs of Contact the NC Division of Water Quality 401 Oversight Unit at
damage have occurred at 919-733-1786.
the outlet.