SW1230601_O&M Agreement/Plan_20231030

Operation & Maintenance Agreement
Project Name: South Parking Lot
Project Location: Asheville Regional Airport, Fletcher, NC
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
location. Any deficient BMP 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 BMP(s).
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: 1 Location(s): South side of parking lot
Grassed Swale Quantity: Location(s):
Green Roof Quantity: Location(s):
Infiltration Basin Quantity: Location(s):
Infiltration Trench Quantity: Location(s):
Level Spreader/VFS 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: Location(s):
Disconnected Impervious Area Present: No Location(s):
User Defined BMP Present: No Location(s):
I acknowledge and agree by my signature below that I am responsible for the performance of the maintenance procedures listed
for each BMP above, and attached O&M tables. I agree to notify NCDENR of any problems with the system or prior to any
changes to the system or responsible party.
* Responsible Party: Lew Bleiweis
Title & Organization: Executive Director, Greater Asheville Regional Aiport Authority
Street address: 61 Terminal Drive, Suite 1
City, state, zip: Fletcher, NC 28732
Phone number(s): [phone]
Email: [e-mail]
Signature: Date:
I, , a Notary Public for the State of
County of , do hearby certify that
personally appeared before me this day of and
acknowledge the due execution of the Operations and Maintenance Agreement .
Witness my hand and official seal,
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Dry Detention Pond Maintenance Requirements
Important maintenance procedures:
- The drainage area will be managed to reduce the sediment load to the dry extended detention basin.
- Immediately after the dry extended detention basin is established, the vegetation will be watered twice weekly if needed
until the plants become established (commonly six weeks).
- No portion of the dry extended detention pond will be fertilized after the first initial fertilization that is required to establish
the vegetation.
- The vegetation in and around the basin will be maintained at a height of approximately six inches.
- If cracks, seepage, or woody vegetation is present, consult a dam safety expert for a dam inspection.
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.
After the dry detention basin is established, it will be inspected quarterly. Inspection activities shall be performed as follows and
any problems identified will be remediated immediately per the table below.
BMP element: Potential problem: How to 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 a
erosive gullies have formed. 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 approximately six inches.
long.
The inlet device The pipe is clogged. Unclog the pipe. Dispose of the sediment off-site.
The pipe is cracked or Replace the pipe.
otherwise damaged.
Erosion is occurring in the Regrade the swale if necessary to smooth it over and provide erosion
swale. control devices such as reinforced turf matting or riprap to avoid future
problems with erosion.
Stone verge is clogged or Remove sediment and replace with clean stone.
covered in sediment (if
applicable).
The forebay Trash/debris is present. Remove the trash/debris.
Erosion has occurred or Provide additional erosion protection such as reinforced turf matting or
riprap is displaced. riprap if needed to prevent future erosion problems.
Weeds are present. Remove the weeds, preferably by hand. If pesticides are used, wipe
them on the plants rather than spraying.
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Dry Detention Pond Maintenance Requirements (continued)
BMP element: Potential problem: How to remediate the problem:
The main treatment area Sediment has accumulated Search for the source of the sediment and remedy the problem if
and reduced the depth to possible. Remove the sediment and dispose of it in a location where
75% of the original design it will not cause impacts to streams or the BMP. Revegetate disturbed
depth (per pond design data areas immediately with sod (preferred) or seed protected with securely
sheet) staked erosion mat.
Water is standing more than Check outlet structure for clogging. If it is a design issue, consult an
5 days after a storm event. appropriate professional.
Weeds and noxious plants Remove the plants by hand or by wiping them with pesticide (do not
are growing in the main spray).
treatment area.
The embankment Shrubs or trees have started Remove shrubs or trees immediately.
to grow on the embankment.
Grass cover is unhealthy or Restore the health of the grass cover—consult a professional if
eroding. necessary.
Signs of seepage on the Consult a professional.
downstream face.
Evidence of muskrat or Use traps to remove muskrats and consult a professional to remove
beaver activity is present. beavers.
An annual inspection by an Make all needed repairs.
appropriate professional
shows that the embankment
nee•s repair.
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 Contact the local NC Department of Environment and Natural
damage have occurred at the Resources Regional Office.
outlet.
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Dry Detention Pond Design Summary
Dry Pond Diagram
DRY POND ID FOREBAY MAIN POND
1 Temporary Pool El: N/A Temporary Pool El: 2155
Clean Out Depth: #VALUE! Clean Out Depth: 0.5
Pretreatment Yes Sediment Storage El: N/A Sediment Storage El: 2154.5
Has Veg. Filter Yes Bottom Elevation: N/A Bottom Elevation: 2154
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