20221135 Ver 2_TriWest Business Center - Operation & Maintenance Agr_20230224

Operation & Maintenance Agreement
Project Name:
TriWest Business Center
Project Location: I Davie County
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 wil
Infiltration Basin Quantity:
Infiltration Trench Quantity:
Bioretention Cell Quantity:
Wet Pond Quantity:
Stormwater Wetland Quantity:
Permeable Pavement Quantity:
Sand Filter Quantity:
Rainwater Harvesting Quantity:
Green Roof Quantity:
Level Spreader - Filter Strip Quantity:
Proprietary System Quantity:
Treatment Swale Quantity:
Dry Pond Quantity:
Disconnected Impervious Surface Present:
User Defined SCM Present:
Low Density Present:
Location(s):
Location(s):
Location(s):
Location(s):
Location(s):
Location(s):
Location(s):
Location(s):
Location(s):
Location(s):
Location(s):
Location(s):
Location(s):
Location(s):
Location(s):
Type:
2
No
No
No
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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.
Signature:
Responsible Party: Mocksville Development Partners, LLC
Title & Organization: Daniel Barnes,4APkw w4Member/Manager of The Crown Companies LLC, Authorized Agent
Street address: 121 N. Crutchfield Street
City, state, zip: Dobson, NC 27017
Phone number(s): 336.386.9790
Email: I [e-mail]
cz:y
Date:
02/24/2023
I, Michelle S. Gough a Notary Public for the State of North Carolina
County of Surry do hereby certify that Daniel Barnes
personally appeared before me this 24 day of February 2023 and
acknowledge the due execution of the Operations and Maintenance Agre ment .
Witness my hand and official seal,
Michello
S. Gough
NOTA
PUBLIC
Surry
ounty, NC
My Commission
xpires July 05, 2025
My commission expires July 5, 2025
STORM-EZ 2/22/2023
Version 1.5 O&M Agreement Page 1 of 4

Wet Pond Maintenance Requirements
Important operation and 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 pond should be fertilized after the initial fertilization that is required to establish
the plants on the vegetated shelf.
_ Stable groundcover will be maintained in the drainage area to reduce the sediment load to the wet
pond.
If the pond must be drained for an emergency or to perform maintenance, the flushing of sediment
through the emergency drain will be minimized as much as possible.
At least once annually, a dam safety expert will inspect the embankment. Any problems that are
found will be repaired immediately.
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 wet pond is established, it will be inspected quarterly and within 24 hours after every storm event greater
than 1.0 inches (or 1.5 inches if in a Coastal County). Records of operation and maintenance shall be kept in a
known set location and shall 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:
The entire wet pond
Trash/debris is present.
Remove the trash/debris.
Areas of bare soil and/or
Regrade the soil if necessary to remove the gully, plant ground
The perimeter of the wet
erosive gullies have
cover and water until it is established. Provide lime and a one -
pond
formed.
time fertilizer application.
The inlet pipe is clogged (if
Unclog the pipe. Dispose of the sediment off -site.
applicable).
The inlet pipe is cracked or
otherwise damaged (if
Repair or replace the pipe.
The inlet device
applicable).
Regrade the swale if necessary and provide erosion control
Erosion is occurring in the
devices such as reinforced turf matting or riprap to avoid future
swale (if applicable).
problems with erosion.
Sediment has
accumulated to a depth
Search for the source of the sediment and remedy the problem
greater than the original
if possible. Remove the sediment and dispose of it in a location
design depth for sediment
where it will not cause impacts to streams or the SCM.
storage.
The forebay
Provide additional erosion protection such as reinforced turf
Erosion has occurred.
matting or riprap if needed to prevent future erosion problems.
Remove the weeds, preferably by hand. If pesticide is used,
Weeds are present.
wipe it on the plants rather than spraying.

Wet Pond Maintenance Requirements (Continued)
SCM element:
Potential problem:
How to remediate the problem:
Sediment has
accumulated to a depth
Search for the source of the sediment and remedy the problem
greater than the original
if possible. Remove the sediment and dispose of it in a location
design sediment storage
where it will not cause impacts to streams or the SCM.
depth.
Algal growth covers over
Consult a professional to remove and control the algal growth.
The main treatment area
50% of the area.
Cattails, phragmites or
other invasive plants cover
Remove the plants by wiping them with pesticide (do not spray).
50% of the basin surface.
Best professional practices
show that pruning is
Prune according to best professional practices.
needed to maintain optimal
plant health.
The vegetated shelf
Determine the source of the problem: soils, hydrology, disease,
Plants are dead, diseased
etc. Remedy the problem and replace plants. Provide a one -
or dying.
time fertilizer application to establish the ground cover if a soil
test indicates it is necessary.
Remove the weeds, preferably by hand. If pesticide is used,
Weeds are present.
wipe it on the plants rather than spraying.
Shrubs have started to
Remove shrubs immediately.
grow on the embankment.
Evidence of muskrat or
Consult a professional to remove muskrats or beavers and
beaver activity is present.
repair any holes or erosion.
A tree has started to grow
Consult a dam safety specialist to remove the tree.
The embankment
on the embankment.
An annual inspection by an
appropriate professional
Make all needed repairs immediately.
shows that the
embankment needs repair.
Clean out the outlet device and dispose of any sediment in a
Clogging has occurred.
gg g
location where it will not cause impacts to streams or the SCM.
The outlet device
The outlet device is
Repair or replace the outlet device.
damaged.
Weeds or volunteer trees
Remove the weeds or trees.
are growing on the mat.
Floating wetland island
The anchor cable is
(if applicable)
damaged, disconnected or
Restore the anchor cable to its design state.
missing.

Wet Pond Maintenance Requirements (Continued)
SCM element:
Potential problem:
How to remediate the problem:
Erosion or other signs of
damage have occurred at
Repair the damage and improve the flow dissipation structure.
the outlet.
Discharges from the wet
The receiving water
pond are causing erosion
or sedimentation in the
Contact the local NCDEQ Regional Office.
receiving water.
0
Pretreatment other No
than forebay?
Has Veg. Filter? No
O
Pretreatment other No
than forebay?
Has Veg. Filter? [;;No
Wet Detention Pond Design Summary
Wet Pond Diagram
Permanent Pool El. 710.5
Temporary Pool El: 712.72
Clean Out Depth: 6
Sediment Removal EI 704.5
Bottom Elevation: 705
FOREBAY
Permanent Pool El.
701.5
Temporary Pool El:
702.5
Clean Out Depth:
4
Sediment Removal Ell 697.5
Bottom Elevation: 1 698
Permanent Pool El. 710.5
Temporary Pool El: 712.72
Clean Out Depth: 6
Sediment Removal El 704.5
Bottom Elevation: 705
RAIN POND
Permanent Pool El.
701.5
Temporary Pool El:
702.5
1
Clean Out Depth:
4
Sediment Removal Ell 697.5
Bottom Elevation: 1 698