SW3220302_O&M Agreement/Plan_20220308

Operation & Maintenance Agreement
Project Name:
Project Location:
Denver Defense
1417 N NC-16 Business, Denver NC 28037
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
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:
1
No
No
No
De aaaea automata
ISouth West corner of property I
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:
Title & Organization:
Street address:
City, state, zip:
Phone number(s):
Email:
Signature:
John Pincelli
PSA Denver LLC
Manager
3850 Fernandina Rd.
Columbia
803-309-5085
[e-mail]
, a Notary Public for the State of
County of Lexington , do hereby certify that
personally appeared before me this
2nd
day of March
acknowledge the due execution of the Operatio Maintenance Agreement .
Witness my hand and official seal,
Date: March 2, 2022
South Carolina
Julian Wilson
and
Seal My commission expires May 25, 2022
STORM-EZ 2/18/2022
Version 1.5 O&M Agreement Page 1 of 1

Sand Filter Maintenance Requirements
Important operation and maintenance procedures:
- Manage the drainage area to reduce the sediment load to the sand filter.
- Clean out the sedimentation chamber or forebay whenever sediment depth exceeds six inches.
- At least once a year, skim the sand media
- Replace the sand filter media whenever it fails to function properly after maintenance.
After the sand filter is established, it shall 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:
Entire sand filter
Trash/debris is present.
Remove the trash/debris.
Adjacent pavement (if
Sediment is present on the
Sweep or vacuum the sediment as soon as possible.
applicable)
pavement surface.
Areas of bare soil and/or
Regrade the soil if necessary to remove the gully, plant ground
erosive gullies have
cover and water until it is established. Provide lime and a one -
The perimeter of the
formed.
time fertilizer application.
sand filter
Vegetation is too short or
Maintain vegetation at an appropriate height.
too long.
The structure is clogged.
Unclog the structure and dispose of sediment in a location
The flow diversion
where it will not cause impacts to streams or the SCM.
structure (if applicable)
The structure is damaged.
Make any necessary repairs or replace if the damage is too
much for repair.
The inlet pipe is clogged (if
Unclog the pipe and dispose of sediment in a location where it
applicable).
will not cause impacts to streams or the SCM.
The inlet pipe is cracked
or otherwise damaged (if
Repair or replace the pipe.
applicable).
Erosion is occurring in the
Regrade the swale if necessary and provide erosion control
The inlet device
swale (if applicable).
devices such as reinforced turf matting or riprap to avoid future
problems with erosion.
Stone verge is clogged or
Remove sediment and clogged stone and replace with clean
covered in sediment (if
stone.
applicable).
Sediment has
Search for the source of the sediment and remedy the problem
accumulated to a depth of
if possible. Remove the sediment and dispose of it in a location
greater than six inches.
where it will not cause impacts to streams or the SCM.
Sediment chamber
(forebay)
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 a pesticide is used,
wipe it on the plants rather than spraying.

Sand Filter Maintenance Requirements (continued)
SCM element:
Potential problem:
How to remediate the problem:
Sand chamber and
Water is ponding on the
Check to see if the collector system is clogged and flush if
underdrain collection
surface for more than 24
necessary. If water still ponds, remove the top few inches of
system
hours after a storm.
filter bed media and replace. If water still ponds, then consult
an appropriate professional.
Clogging has occurred.
gg g
Clean out the outlet device and dispose of sediment in a
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.
Erosion or other signs of
damage have occurred at
Repair the damage and improve the flow dissipation structure.
the outlet.
Discharges from the sand
The receiving water
filter are causing erosion
Contact the local NCDEQ Regional Office.
or sedimentation in the
receiving water.