SW3230606_O&M Agreement/Plan_20230630

Operation & Maintenance Agreement
Finger Mill
Lincolnton, NC Union County
Prepared by:Jason K.Seaman,PE,Thomas&Hutton
Cover Page
Maintenance records shall be kept on the following BMP(s). This maintenance record shall be kept in a log in a known set
The BMP(s)on this project include(check all that apply&corresponding O&M tables will be added automatically):
Bioretention Cell Quantity: Location(s):
Dry Detention Basin Quantity: Location(s):
Grassed Swale Quantity: Location(s):
Green Roof Quantity: Location(s):
Infiltration Basin Quantity: Location(s):
Infiltration Trench Quantity: Location(s):
Level SpreaderNFS Quantity: Location(s):
Permeable Pavement Quantity: Location(s):
Proprietary System Quantity: Location(s):
Rainwater Harvesting Quantity: Location(s):
Sand Filter Quantity: Location(s):
Stormwater Wetland Quantity: Location(s):
Wet Detention Basin Quantity: 1 Location(s): Pond 01
Disconnected Impervious Area Present: No Location(s):
Soil Amendments Present: No Location(s):
I acknowledge and agree by my signature below that I am responsible for the performance of the maintenance procedures
* Responsible Party: Kevin Lambert
Title&Organization: Authorized Signatory/Cresent Acquisitions, LLC
Street address: 601 S.Tryon St.Suite 800
City, state,zip: Charlotte, NC 28202
Phone number(s): 704-681-0957
Email: [e-mail]
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Signature: W✓ Date: 5 lZ'� �'�'�
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County of VI (! o!',AA ,A,f ,do hearby ce 'fy that 1�l✓1 LG ',IA
personally appeared before me this V (�y�d day of � 2 (Z and
acknowledge the due execution of the Operations and Maintenance Agreeme t.
Witness my hand and official seal, NJ U v V '' i %/,At ., ----�' .
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Wet Detention Pond Maintenance Requirements
The wet detention basin system is defined as the wet detention basin, pretreatment including forebays and the vegetated
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
Inspection activities shall be performed as follows. Any problems that are found shall be repaired immediately.
1 BMP element: Potential problem: i How I will 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
Vegetation is too short or Maintain vegetation at a height of approximately six inches.
The inlet device The pipe is clogged. I Unclog the pipe. Dispose of the sediment off-site.
The pipe is cracked or Replace the pipe.
Erosion is occurring in the Regrade the swale if necessary to smooth it over and provide
Stone verge is clogged or Remove sediment and replace with clean stone.
The forebay Sediment has accumulated Search for the source of the sediment and remedy the problem if
Erosion has occurred. Provide additional erosion protection such as reinforced turf
Weeds are present. Remove the weeds, preferably by hand. If pesticide is used,wipe
The vegetated shelf Best professional practices Prune according to best professional practices
Plants are dead, diseased Determine the source of the problem: soils, hydrology, disease,
Weeds are present. Remove the weeds, preferably by hand. If pesticide is used,wipe
Wet Detention Pond Maintenance Requirements(Continued)
The main treatment area Sediment has accumulated'Search for the source of the sediment and remedy the problem if
Algal growth covers over Consult a professional to remove and control the algal growth. _
Cattails, phragmites or Remove the plants by wiping them with pesticide(do not spray).
The embankment Shrubs have started to Remove shrubs immediately.
Evidence of muskrat or ,Use traps to remove muskrats and consult a professional to
A tree has started to grow Consult a dam safety specialist to remove the tree.
An annual inspection by an Make all needed repairs.
The outlet device Clogging has occurred._ Clean out the outlet device. Dispose of the sediment off-site.
The outlet device is Repair or replace the outlet device.
The receiving water Erosion or other signs of Contact the local NC Department of Environment and Natural
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.
Wet Detention Pond Design Summary
WET POND ID FOREBAY MAIN POND
1 Normal Pool El. 808.5 Normal Pool El. 808.5
Temporary Pool El: 809.33 Temporary Pool El: 809.33
Pretreatment other No Clean out depth: 3.5 Clean out depth: 3.5
than forebay? Sediment Storage El: 805.5 Sediment Storage El: 805.5
Has Veg.Filter? No Bottom El: 805 Bottom El: 805