SW1210502_C-DOC-1901780-O&M-EZ-2021-02-09-SIGNED_20210519

Operation & Maintenance Agreement
Project Name: Proposed Development - Boylston Highyway, Mills River, NC
Project Location: 5Fanning Fields Road
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:
8
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:
7
No
No
No
�Z3"LCI�RYI1lU] Iifa\t
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: David Buck
Title & Organization: Executive Managing Director, ALM Asheville
Street address: 9830 Colonnade Blvd, Suite 600
City, state, zip: San Antonio, TX 78255
Phone number(s): [phone]
Email:l [e-mail]
Signature: Date:
154
— \ - "I \
1, Aga n �A,n+t 0►AO —,a Notary Public for the State of j �'�Ca-S
County of Re KQt- , do hereby certify that 3 mi d Yt1CV-
personally appeared before me this Ll th— day of Pe'_h rU6L r1A a, Oak and
acknowledge the due execution of the Operations and Maintenance Agreement.
Witness my hand and official seal, f` 1 Qatri_ •---
Seal
Ir
1 ar
• 1=i
My commission expires it�'�,p�y
STORM-EZ 2/9/2021
Version 1.5 O&M Agreement Page 1 of 1

Infiltration Basin Maintenance Requirements
Important operation and maintenance procedures:
- The drainage area will be carefully managed to reduce the sediment load to the infiltration basin.
No portion of the infiltration basin will be fertilized after the initial fertilization that is required to
- establish the vegetation. Lime may be allowed if vegetation is planted on the surface of the infiltration
basin and a soil test shows that it is needed.
- The vegetation in and around the basin will be maintained at a height of four to six inches.
After the infiltration basin 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 infiltration
Trash/debris is present.
Remove the trash/debris.
basin
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 grass filter strip or
formed.
time fertilizer application.
other pretreatment area
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 three inches.
where it will not cause impacts to streams or the SCM.
The structure is clogged.
Unclog the conveyance and dispose of any sediment in a
The flow diversion
location where it will not cause impacts to streams or the SCM.
structure (if applicable)
Make any necessary repairs or replace if damage is too much
The structure is damaged.
for repair.
The inlet pipe is clogged (if
Unclog the pipe and dispose of any sediment in a location
applicable).
where it 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
erosion problems.
Stone verge is clogged or
Remove sediment and clogged stone and replace with clean
covered in sediment (if
stone.
applicable).
More than four inches of
Search for the source of the sediment and remedy the problem
sediment has
if possible. Remove the sediment and dispose of it in a location
accumulated.
where it will not cause impacts to streams or the SCM.
The basin
Erosion of the basin
surface has occurred or
Provide additional erosion protection such as reinforced turf
riprap is displaced.
matting or riprap if needed to prevent future erosion problems.
Water is standing more
Replace the top few inches of soil to see if this corrects the
than three days after a
standing water problem. If not, consult an appropriate
storm event.
1professional for a more extensive repair.

Infiltration Basin Maintenance Requirements (continued)
SCM element:
Potential problem:
How to remediate the problem:
Shrubs or trees are
growing on the
Remove shrubs and trees immediately.
embankment.
The embankment
n annual inspection by
an appropriate
professional shows that
Make needed repairs immediately.
the embankment needs
repair.
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.
The receiving water
Discharges from the
infiltration basin are
causing erosion or
Contact the local NCDEQ Regional Office.
sedimentation in the
receiving water.

Proprietary System Maintenance Requirements
How many devices are 0
Contech StormFilters?
Important operation and maintenance procedures:
- The drainage area will be carefully managed to reduce the sediment load to the StormFilter.
- The sedimentation chamber or forebay will be cleaned out whenever sediment depth exceeds six inches.
The StormFilter system will be inspected quarterly. Records of operation and maintenance will be kept in
a known set location and will be available upon request.
Inspection activities shall be performed as follows. Any problems that are found shall be repaired immediately.
BMP element:
Potential problem:
How to remediate the problem:
Adjacent pavement (if
Trash/debris is present.
Remove the trash/debris.
applicable)
Flow diversion structure
Sediment is present on the
Sweep or vacuum the sediment as soon as possible.
pavement surface.
StormFilter Cartridges
The structure is clogged.
Unclog the conveyance and dispose of any sediment offsite.
The structure is damaged.
Make any necessary repairs or replace if damage is too large for
repair.
Outlet device
Clogging has occurred.
Clean out the outlet device. Dispose of the sediment offsite.
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.
The receiving water
Discharges from the
StormFilter are causing
erosion or sedimentation in
Contact the local NCDEQ Regional Office.
the receiving water.
All other operation and maintenance activities should be in accordance with Contech's StormFilter Inspection and
Maintenance Procedures document. Any problems that are found shall be repaired immediately. The responsible party
shall have received and understand Contech's StormFilter Inspection and Maintenance Procedures document.
ATTACH MANUFACTURER'S MAINTENANCE MANUAL FOR ALL PROPRIETARY DEVICES

BAYFILTERTm INSPECTION
AND MAINTENANCE MANUAL
The BayFilter system requires periodic maintenance
to continue operating at the design efficiency. The
maintenance process is comprised of the removal
and replacement of each BayFilter cartridge,
vertical drain down module; and the cleaning of
the vault or manhole with a vacuum truck.
The maintenance cycle of the BayFilter system
will be driven mostly by the actual solids load
on the filter. The system should be periodically
monitored to be certain it is operating correctly.
Since stormwater solids loads can be variable,
it is possible that the maintenance cycle could
be more or less than the projected duration.
BayFilter systems in volume -based applications
are designed to treat the WQv in 24 to 48 hours
initially. Late in the operational cycle of the BayFilter,
the flow rate will diminish as a result of occlusion.
When the drain down exceeds the regulated
standard, maintenance should be performed.
When a BayFilter system is first installed, it is
recommended that it be inspected every six (6)
months. When the filter system exhibits flows below
design levels the system should be maintained. Filter
cartridge replacement should also be considered
when sediment levels are at or above the level of
the manifold system. Please contact the BaySaver
Technologies Engineering Department for maintenance
cycle estimations or assistance at 1.800.229.7283.
BayFilter System Cleanout
Vactor Truck Maintenance
Jet Vectoring Through Access Hatch

Maintenance Procedures
1. Contact BaySaver Technologies for replacement filter
cartridge pricing and availability at 1800-229-7283.
2. Remove the manhole covers and open all
access hatches.
3. Before entering the system make sure the air
is safe per OSHA Standards or use a breathing
apparatus. Use low 02, high CO, or other applicable
warning devices per regulatory requirements.
4. Using a vacuum truck remove any liquid and
sediments that can be removed prior to entry.
5. Remove the hold down bars. Using a small lift or the boom
of the vacuum truck, remove used cartridges by lifting
them out.
6. Any cartridges that cannot be readily lifted
can be easily slid along the floor to a location
they can be lifted via a boom lift.
7. When all the cartridges have been removed, it is
now practical to remove the balance of the solids
and water. Loosen the stainless clamps on the
Fernco couplings for the manifold and remove the
drain pipes as well. Carefully cap the manifold and
the Ferncos and rinse the floor, washing away the
balance of any remaining collected solids.
8. Clean the manifold pipes, inspect, and reinstall.
9. Install the exchange cartridges, reinstall the
hold down bars and close all covers.
10. The used cartridges may be sent back to
BaySaver Technologies for recycling.
For more information please see the BaySaver website
at www.baysaver.com or contact 1-800-229-7283.
Manifold Tee View of a Cleaned System
Cartridge Hoist Point