SW4220201_O&M Agreement/Plan_20220926

Operation & Maintenance Agreement
Project Name: Hanes Lake Phase 2
Project Location: 2750 Spicewood Drive
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 & corres
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.
nding O&M sheets will be added automaticali
Location(s):
Location(s):
Location(s):
Location(s):
Location(s):
Location(s):
Location(s):
Location(s): j
Location(s):
Location(s):
Location(s): SCM 1-5, offsite SCM
Location(s):
Location(s):
> Location(s):
Location(s):
s Type: Vegetated swalesi
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:
Clayton Properties Group, Inc.
Chris Inabinet, VP
221 Jonestown Road
Winston-Salem, NC 27104
[phone]
[e-mail]
Sign ure: ry{ -�� F r� Date:-1
—
� --- ---� - , a Notary Public for the State of %V�
County of do hereby certify that
personally appeared before me this�day of P P s �Q r�� and
acknowledge the due execution oft peratipns and M ten a Ag;eerrsent .
Witness my hand and official seal, JL C�j/• Jam"
CONNIE A. ADI R
NOTARYPUBLIC
Davidson Count,
North Carolina
My Commission Expires 0 J052025
Seal My commission expires��
STORM-EZ 9/9/2022
Version 1 5 O&M Agreement Page 1 of 1

Proprietary System Maintenance Requirements
How many devices are
Gonterh ?
A'D S e- ¢ �' q
Important operation and maintenanc7procegures:
- 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

Maintenance on Ba saver Ba Filter
Due try the high level of pollutant variation and specifically sediment loading, the unit Shall be
inspected at least every other month during the first year of operation to determine Ioading
and required maintenance intervals. This information can be used to establish an appropriate
maintenance schedule for subsequent years. If soil disturbing activities are being conducted
within the unit's drainage area, inspection frequencies must be increased to once each month
and after rain events of 0.3" and larger. The maintenance cycle of the BayFilter system Gvill be
driven mostlg, by the actual solids load on the filter. The system should be periodically
monitored to be certain it i5 operating correctly.
Indications of the need for maintenance:
• Effluent flow decreasing to below the design flow rate or decrease in treatment below
required levels (e.g., greater than 2-4hr drain down for a volume based system, or the
detention drain down time- whichever is greater).
• Filter cartridge replacement should also be considered when sediment levels are at or
above the level of the manifold system which is 6 inches and 3 inches for a BayFilter 3��
and 545-1-P, respectively.
• Bypass occurs during storm events (but no standing water or excessive
• if excessive floatables.. (trash and debris) are present
sedimentation), perform a minor maintenance consisting of gross solids removal, not
filter media replacement.
• If standing water above the bottom of the filter cartridge is present in the vault 96 hours
after a 2 year rainfall event.
• Removal of trash and silt from the pretreatment chamber
Maintenance & Inspection Procedure
Remove the manhole covers and open all access hatches.
• Before entering the system make sure the air is safe per OSHLk Standards or use a
breathing apparatus. Use low 02, high CO, or other applicable warning devices per
regulatory requirements.
• Using a vacuum truck remove any liquid and sediments that can be removed prior to
entry.
• Using a small lift or the boom of the vacuum truck, remove the used cartridges by lifting
them out.
• ny BayFilters that cannot be readily lifted directly out of the vault should be removed
from their location and Carried to the lifting point using the Trolley system installed in
the vault (if applicable).
• When all BayFilters are removed, remove the balance of the solids and water; then
loosen the stainless clamps on the Fernco couplings in the pipe manifold; remove the
drain pipes as well. Carefully cap the manifold and the Ferncos and rinse the floor
removing the balance of the collected solids.
• Clean the manifold pipes, inspect, and reinstall.
• Install the exchange BayFilters and close all covers.
tes that used BayFilter cartridges may be sent back to
and credit on undamaged units. Contact BaySaver
for more information.
BaySaver Technologies, LLC. st
them for exchange/recycling
Technologies at 1.800.229.7283

• According to 30 TAC 330 or 30 TAC 33-3, identify any special disposal requirements
Dissociated with spent media, absorbents, or other material to be generated during
routine cleaning/maintenance operations.
• Removed media will be disposed of according to local and state regulations.
Maintenance on Storage S stem
Underground detention vaults are similar in function as open detention basins. They have
moderate to high maintenance requirements, depending on the extent to which future
maintenance needs are anticipated during the design stage. Responsibilities for both routine
and non -routine maintenance tasks need to be clearly understood and enforced. if regular
maintenance and inspections are not undertaken, the basin will not achieve its intended
purposes.
inspections. Storage vaults should be inspected at least twice a year (once during or immediately
following wet weather) to evaluate facility operation. When possible, inspections should be
conducted during wet weather to determine if the vault is meeting the target detention times. in
particular, the vault's flogs control device should be regularly inspected for evidence of
clogging, or conversely, for too rapid a release. if the design draFvdown tithes are exceeded by
more than 24 hours, then repairs should be scheduled immediately.
Debris and Litte r Re nioval. Debris and litter will accumulate near the vault's flow conLT01 device.
Particular attention should be paid to floating debris that can eventually clog the control device
or riser or orifice.
Structural Repairs and Replacement. With each inspection, any damage to the structural
elements of the system (pipes, concrete drainage structures, etc.) should be identified and
repaired immediately.
_'Nuisance Control. Standing water within the bottom of the basin can create nuisance conditions
for nearby residents. Odors, mosquitoes, and litter aare
a 1 occasionally
regularinllinspections toand
be
problems. Most of these problems are generally g that
maintenance are not being performed.
Sediment Removal. Gkben properly designed, storage vaults will accumulate quantities of
sediment over time. Sediment accumulation is a serious maintenance concern in vaults for
several reasons. First, the sediment gradually reduces available storm -water management
storage capacity within the vault. Second sediment tends to accumulate around the control
device. Sediment deposition increases the risk that the orifice will become clogged, and
gradually reduces storage capacity reserved for pollutant removal. Sediment can also be re-
suspended if allowed to accumulate over time. For these reasons, accumulated sediment needs
to be removed from the lower stage when sediment buildup fills 20% of the volume of the vault
or at least every 10 years.
Manufacturer Contact information.
ADS/BaySaver Technologies Engineering Department
Email: infoJalbays aver. corn
Phone: [phone]
Website: http://www.baysaver.com/
Mail or other: 1030 Deer Hollow Drive
Mount Airy, MD 21771

f I,
StormTebft
isolator Row
O&M Manual
MC-4M
THE MOSTr`. NAME /N WATER MANAGEMENT SOLUTIONS""

S �� tea._ .._�. _ ... ..c • � � ��
INTRODUCTION
An important component of any Stormwater Pollution Prevention
Plan is inspection and maintenance. The StormTech Isolator Row is
a technique to inexpensively enhance Total Suspended Solids (TSS)
removal and provide easy access for inspection and maintenance.
THE ISOLATOR ROW
The Isolator Row is a row of StormTech chambers, either SC-160LP,
SC-310, SC-310-3, SC-740, DC-780, MC-3500 or MC-4500 models,
that is surrounded with filter fabric and connected to a closely located
manhole for easy access. The fabric -wrapped chambers provide for
settling and filtration of sediment as storm water rises in the Isolator
Row and ultimately passes through the filter fabric. The open bottom
chambers and perforated sidewalls (SC-310, Sc- 310-3 and SC-740
models) allow storm water to flow both vertically and horizontally out of
the chambers. Sediments are captured in the Isolator Row protecting
the storage areas of the adjacent stone and chambers from sediment
accumulation.
Two different fabrics are used for the Isolator Row. A woven geotextile
fabric is placed between the stone and the Isolator Row chambers.
The tough geotextile provides a media for storm water filtration and
provides a durable surface for maintenance operations. It is also
designed to prevent scour of the underlying stone and remain intact
during high pressure jetting. A non -woven fabric is placed over the
chambers to provide a filter media for flows passing through the
perforations in the sidewall of the chamber. The non -woven fabric is not
required over the SC-160LP, DC-780, MC-3500 or MC-4500 models as
these chambers do not have perforated side walls.
The Isolator Row its typically designed to capture the "first flush" and
offers the versatility to be sized on a volume basis or flow rate basis.
An upstream manhole not only provides access to the Isolator Row but
typically includes a high flow weir such that storm water flowrates or
volumes that exceed the capacity of the Isolator Row overtop the over
flow weir and discharge through a manifold to the other chambers.
The Isolator Row may also be part of a treatment train. By treating
storm water prior to entry into the chamber system, the service life can
be extended and pollutants such as hydrocarbons can be captured.
Pre-treatment best management practices can be as simple as
deep sump catch basins, oil -water separators or can be innovative
storm water treatment devices. The design of the treatment train and
selection of pretreatment devices by the design engineer is often
driven by regulatory requirements. Whether pretreatment is used or not,
the Isolator Row is recommended by StormTech as an effective means
to minimize maintenance requirements and maintenance costs.
Note. See the StormTech Design Manual for detailed information on
designing inlets for a StormTech system, including the Isolator Row.
Looking down the Isolator Row €rom the
manhole opening, woven gent" ile is shown
between the chamber and stone base.
StormTech Isolator Row with
Overflow Spillway (not to scale)
:. oPnowL
?R= _TREATMENT
r
.1. 1 1
DVERFLOW
WE:R
ECCENTRIC --
HEADER
OPTIONAL
ACCESS v

INSPECTION
The frequency of inspection and maintenance varies by location. A
routine inspection schedule needs to be established for each individual
location based upon site specific variables. The type of land use (i.e.
industrial, commercial, residential), anticipated pollutant load, percent
imperviousness, climate, etc. all play a critical role in determining the
actual frequency of inspection and maintenance practices.
At a minimum, StormTech recommends annual inspections. Initially,
the Isolator Row should be inspected every 6 months for the first year
of operation. For subsequent years, the inspection should be adjusted
based upon previous observation of sediment deposition.
The Isolator Row incorporates a combination of standard manhole(s) and strategically located inspection ports
(as needed). The inspection ports allow for easy access to the system from the surface, eliminating the need to
perform a confined space entry for inspection purposes.
If upon visual inspection it is found that sediment has accumulated, a stadia rod should be inserted to
determine the depth of sediment. When the average depth of sediment exceeds 3 inches throughout the length
of the Isolator Row, clean -out should be performed.
MAINTENANCE
The isolator Raw was designed to reduce the cast of periodic maintenance. By "isolating" sediments to just
one row, costs are dramatically reduced by eliminating the need to clean out each row of the entire storage
on
l need for
e, acces
ends) of the row forcleanoupt. If entry into he manhole is the required please follow local and OSHA ulesdfor a
the ( )
confined space entries.
Maintenance is accomplished with the JetVac process. The JetVac process utilizes a high pressure water
nozzle to propel itself down the Isolator Row while scouring and suspending sediments. As the nozzle is
retrieved, the captured pollutants are flushed back into the manhole for vacuuming• Moscose ate Jed Pipe azxle
maintenance companies have vacuum/JetVac combination vehicles. Selection of an appropriate
will improve maintenance efficiency. Fixed nozzles designed for culverts or large diameter pipe cleaning are
preferable. Rear facing jets with an effective spread of at least 45" are best. Most JetVac reels have 400 feet
of hose allowing maintenance of an Isolator Row up to 50 chambers long. The JetVac process shall only
be performed on StormTech Isolator Rows that have AASHTO class 1 woven geotextile (as specified by
StormTech) over their angular base stone.
StormTech Isolator Row (not to scale)
Note: Non -woven fabric is only required over the inlet pipe connection into the end cap for SC-160LP, DC-780, MC-3500 and MC-4500 chamber
models and is not required over the entire Isolator Row.
PGRT
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:GEQ+NTHETIL5501'+iON-iYCFNr-TPERTLE — -.--_" 'i ...
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OR '
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STEP 1
Inspect Isolator Row for sediment.
A) Inspection ports (if present)
i. Remove lid from floor box frame
ii. Remove cap from inspection riser
iii. Using a flashlight and stadia rod,measure depth of sediment and record results on maintenance fog.
iv. If sediment is at or above 3 inch depth, proceed to Step 2. If not, proceed to Step 3.
8) All Isolator Rows
i. Remove cover from manhole at upstream end of Isolator Row
ii. Using a flashlight, inspect down Isolator Row through outlet pipe
1. Mirrors on poles or cameras may be used to avoid a confined space entry
2. Follow OSHA regulations for confined space entry if entering manhole
iii. If sediment is at or above the lower row of sidewall holes (approximately 3 inches), proceed to Step 2.
If not, proceed to Step 3.
STEP 2
Clean out Isolator Row using the JetVac process.
A) A fixed floor cleaning nozzle with rear facing nozzle spread of 45 inches or more is preferable
B) Apply multiple passes of JetVac until backflush water is clean
C) Vacuum manhole sump as required
STEP 3
Replace all caps, lids and covers, record observations and actions.
STEP 4
Inspect & clean catch basins and manholes upstream of the StormTech system.
mwn
SAMPLE MAINTENANCE LOG
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Sample Maintenance Contract
StormTech Isolator Row
XXXXX County, NC
Project Name.
Location
Contract Period 202X— 202X (Renewable)
Owner: Name
Address
Contact Number
Vendor. Name
Address
Contact Number
XXXXXXXXXX hereby agrees to provide maintenance on the above referenced project for both
the inspection and clean- out of the proposed StormTech Systems. Inspection of the stormwater
treatment systems will be conducted as outlined below to ensure that the systems are performing
as intended and to develop an appropriate site -specific clean -out schedule. Clean -out of the
stormwater treatment systems will be performed as outlined below at a frequency that will
provide optimal system performance on a cost-effective basis. This maintenance contract will
comply with any State regulations that apply to such programs and all waste removed from the
system will be disposed of properly. Inspection and Maintenance shall be in accordance with
the latest `Isolator Row 0&M Manual" modified by the provisions below. The following services
and documentation will be provided
System Inspection
Inspection of the StormTech System will occur semi-annually for a period of two years beginning
upon the installation of the StormTech System. Inspection will consist of measuring the sediment
accumulation in the Isolator Row. Based on the pollutant accumulation information gathered
during the initial inspection period, a site -specific remainder of thedule will Cvntract.be Clean - to of
determine the frequency of inspections for the re
the system is to be performed when the average sediment accumulation is between 1"
and 2" in the Isolator Row.
Page 1 of 3

System Clean -Out
Clean -out of the StormTech System will be
aforementioned inspections. Evacuation
achieved through an appropriate manner in
regulations
conducted on a frequency determined by the
and disposal of captured pollutants will be
accordance with any governing State and local
Reportin
A document describing the below bulleted items will be prepared
ite after
er. If required ainspection
report ndl
provided to the responsible contact as design at ed by the
wil
be provided to the relevant State Department after maintenance procedures so that a record
is on file at that location.
i Accumulated sediment and debris volume
r Maintenance recommendations
Other relevant observations
Maintenance Costs
Inspection - $ ## per visit
Clean -Out** - $ ## per clean -out per linear foot of Isolator Row
Authorized Representative Date Site Owner
Signature of this form constitutes a binding agreement to the terms and fees
Date
Page 2 of 3

Sam p le Maintenance L�
Page 3 of 3

Low Density Maintenance Requirements
Important maintenance procedures:
The drainage area to the vegetated conveyance or vegetated receiving area will be carefully managed
to reduce the sediment load to the vegetated conveyance or vegetated receiving area.
After the initial fertilization to establish the grass in the vegetated conveyance or the vegetated receiving
area, fertilizer will not be applied to the vegetated receiving areas.
The vegetated conveyance or vegetated receiving area 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.
SCM element:
Vegetation
Vegetated receiving
areas
Vegetated conveyances /
swales / roadside ditches
(other than curb outlet
swales)
Potential problem:
How to remediate the problem:
Vegetation is too short or
Maintain grassed vegetation such that the swale or vegetated
too long.
area does not erode during the peak flow from the 10-year storm
Trash/debris is present.
Remove the trash/debris.
Areas of bare soil and/or
Regrade the soil if necessary to remove the gully, and then re -
erosive gullies have
sod (or plant with other appropriate species) and water until
formed.
established. Provide lime and a one-time fertilizer application.
Trees and/or other woody
Remove the trees and woody vegetation from the swale, regrade
vegetation are present in
the swale if necessary and re-establish grass as shown on the
the swale.
approved plans.
Trash/debris is present.
Remove the trash/debris.
Areas of bare soil and/or
Regrade the soil if necessary to remove the gully, and then re -
erosive gullies have
sod (or plant with other appropriate species) and water until
formed.
established. Provide lime and a one-time fertilizer application.
Sediment covers the grass
Remove sediment and dispose in an area that will not impact
at the bottom of the swale.
streams or SCMs. Re -sod if necessary.
Regrade the slopes to the permitted configuration per the
The side slope is steeper
approved plan and reestablish vegetation. If as -built or existing
than the approved
conditions do not allow the slopes to be regraded, contact the
configuration.
applicable permitting agency
Determine the source of the problem: soils, hydrology, disease,
Grass is dead, diseased or
etc. Remedy the problem and replace plants. Provide a one -
dying.
time fertilizer application to establish the ground cover if
necessary.
Trees and/or other woody
Remove the trees and woody vegetation from the vegetated
vegetation are present in
conveyance, regrade the vegetated conveyance if necessary and
the vegetated conveyance.
re-establish grass as shown on the approved plans.

Clogging has occurred.
Clean out the outlet device. Dispose of the sediment off -site.
The outlet device (if
applicable)
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 site
are causing erosion or
Contact the local NCDEQ Regional Office.
sedimentation in the
receiving water.