SWA000224_O&M Agreement/Plan_20230929

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WET DETENTION BASIN
OPERATION ANI) MAINTENANCE AGREEMENT
Project Name: Dollar General Henderson Vicksboro Rd
Project Location: Intersection of Vicksboro Rd & Rock Mill Rd
SCM as Identified on Approved Plans: Yes
PIN Number: 0536 05001
Mail after recording to: City of Henderson
Engineering Department
P.O.Box 1434
Henderson,NC 27536
NORTH CAROLINA
VANCE COUNTY
This STORMWATER OPERATION AND MAINTENANCE AGREEMENT,
made this day of ,20 23
by Rhetson Companies, Inc whose principal address is
2075 Juniper Lake Rd, West End, NC 27376 with,to,and for the
benefit of the City of Henderson, a municipal corporation of the State of North Carolina,whose
address is P.O.Box 1434,I-Ienderson,North Carolina 27536.

•
Wet Detention Basin Operation and Maintenance Agreement
I will keep a maintenance record on this Stormwater Control Measure(SCM). This maintenance
record will 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 removal efficiency of the SCM.
The wet detention basin system is defined as the wet detention basin,pretreatment
including forebays and the vegetated filter if one is provided.
This system(check one):
n does V does not incorporate a vegetated filter at the outlet.
This system (check one):
n does 1,A does not incorporate pretreatment other than a forebay.
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. Records of operation and maintenance
should be kept in a known set location and must be available upon request.
Annually,by Sept 30,an inspection shall be completed by a qualified professional and
submitted to the City of Henderson.
Inspection activities shall be performed as follows. Any problems that are found shall be repaired
immediately.
SCM element: Potential problem: How I will remediate the problem:
The entire SCM Trash/debris is present. Remove the trash/debris.
The perimeter of the wet Areas of bare soil and/or erosive Regrade the soil if necessary to remove
detention basin gullies have formed. the gully,and then plant a 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
long. approximately six inches.
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SCM element: Potential problem: How I will remediate the problem:
The inlet device: pipe or The pipe is clogged. Unclog the pipe. Dispose of the
swale sediment off-site.
The pipe is cracked or otherwise Replace the pipe.
damaged.
Erosion is occurring in the Regrade the swale if necessary to
swale. smooth it over and provide erosion
control devices such as reinforced turf
matting or riprap to avoid future
problems with erosion.
The forebay Sediment has accumulated to a Search for the source of the sediment
depth greater than the original and remedy the problem if possible.
design depth for sediment Remove the sediment and dispose of it
storage. in a location where it will not cause
impacts to streams or the SCM.
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 herbicide is used,wipe it on the
plants rather than spraying.
The vegetated shelf Best professional practices show Prune according to best professional
that pruning is needed to practices
maintain optimal plant health.
Plants are dead,diseased or Determine the source of the problem:
dying. soils,hydrology,disease,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 are present. Remove the weeds,preferably by hand.
If herbicide is used,wipe it on the
plants rather than spraying.
The main treatment area Sediment has accumulated to a Search for the source of the sediment
depth greater than the original and remedy the problem if possible.
design sediment storage depth. Remove the sediment and dispose of it
in a location where it will not cause
impacts to streams or the SCM.
Algal growth covers over 50% Consult a professional to remove and
of the area. control the algal growth.
Cattails,phragmites or other Remove the plants by wiping them with
invasive plants cover 10%of the herbicide(do not spray).
basin surface.
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SCM element: Potential problem: How I will remediate the problem:
The embankment Shrubs have started to grow on Remove shrubs immediately.
the embankment.
Evidence of muskrat or beaver Use traps to remove muskrats and
activity is present. consult a professional to remove
beavers.
A tree has started to grow on the Consult a darn safety specialist to
embankment. remove the tree.
An annual inspection by Make all needed repairs, 1
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 damage Contact the City of Henderson
have occurred at the outlet. Engineering Department at
252-430-5700.
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,
When the permanent pool depth reads 7 feet in the main pond,the sediment shall be
removed.
When the permanent pool depth reads 4 feet in the forebay,the sediment shall be
removed.
BASIN DIAGRAM
ill in the blanks)
Permanent Pool Elevation 462'
Sediment Removal E 459 Pe maven Pool
Volume Sediment Removal Elevation 455 Volume
Bottom Elevation 458 -ft Min.
Sediment Bottom Elevation 454 : 1-ft in.
Storage Sediment
Storage
FOREBAY MAIN POND
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I acknowledge and agree by my signature below that I am responsible for the
performance of the maintenance procedures listed above. I agree to notify the City of
Henderson of any problems with the system or prior to any changes to the system or
responsible party.
This Agreement shall be binding upon the undersigned and its successors and assigns and
all current and future owners thereof, and their respective heirs, successors and assigns,
in perpetuity, and shall be appurtenant to,run with, and burden the parcels of land l
referred to herein.
Project name: Dollar General Henderson Vicksboro Rd
SCM as identified on approved plans:Wet Pond
Printnamt,e�:``. a1`�, tt- , : . ( ,1'1G-1 C? c-
Title:CAt tl i.- 0�:a,e, G 74.1 1(' 0\ -4, c.s.-x '
Address:2075 Juniper Lake Rd, West End, NC 27376
Phone: [phone]I
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Signature: (. -
-.-..•,..--.1-
Date: 7
I, IN kcap\C.) eV). O\eSC.e , a Notary Public for the State of
IA& C m 6 Ti hc-.,, County of 404 Vnp_,-Ick— , do hereby certify that
1t, S. iL YNCI ruS °, personally appeared before me
this a�54' day of , D.bas and acknowledge the due
execution of the forgoing wet detention basin maintenance requirements. Witness my
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hand and official seal, �,�� r-�
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SEAL
My commission expires \ q Cr+ I Duo-a--
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