SW1240401_O&M Agreement/Plan_20240815

Operation & Maintenance Agreement
Project Name: Blackwell Hall Renovations & Additions
Project Location: Mars Hill University, Mars Hill, NC 28754
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 be added automatically):
Infiltration Basin Quantity: Location(s):
Infiltration Trench Quantity: 1 Location(s): East side of Blackwell Hall
Bioretention Cell Quantity: Location(s):
Wet Pond Quantity: Location(s):
Stormwater Wetland Quantity: Location(s):
Permeable Pavement Quantity: Location(s):
Sand Filter Quantity: Location(s):
Rainwater Harvesting Quantity: Location(s):
Green Roof Quantity: Location(s):
Level Spreader- Filter Strip Quantity: Location(s):
Proprietary System Quantity: Location(s):
Treatment Swale Quantity: Location(s):
Dry Pond Quantity: Location(s):
Disconnected Impervious Surface Present: No Location(s):
User Defined SCM Present: No Location(s):
Low Density Present: No Type:
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: John Anthony Floyd
Title & Organization: President- Mars Hill University
Street address: 52 College Street
City, state, zip: Mars Hill, NC 28754
Phone number(s): 828.689.1100
Email: [e-mail]
Signature: i\vs ;lro.'V Date:
1, ?NOV\ ,(r, ` L;i , a Notary Public for the State of Ne—
County of irc,..6, s. , do hereby certify that ,- ,,,,, \ ' \0.0,
personally appeared before me this \ day of •C- E1j,.s,� An4- and
acknowledge the due execution of the Operations and Maintenance Agreement .
Witness my hand and official seal, r\ (�. � � -
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STORM-EZ 8/13/2024
Version 1.5 O&M Agreement Page 1 of 1

Infiltration Trench Maintenance Requirements
Important operation and maintenance procedures:
- The drainage area will be carefully managed to reduce the sediment load to the infiltration trench.
The water level in the monitoring wells will be recorded once a month and after every storm event
greater than 1.0 inches (or 1.5 inches if in a Coastal County.
The infiltration trench will be inspected once a quarter 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.
trench
Areas of bare soil and/or Regrade the soil if necessary to remove the gully, and then plant
erosive gullies have a ground cover and water until it is established. Provide lime and
The grass filter strip or formed. a one-time fertilizer application.
other pretreatment area Sediment has accumulated Search for the source of the sediment and remedy the problem if
to a depth of greater than possible. Remove the sediment and dispose of it in a location
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 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.
Water is ponding on the Remove the accumulated sediment from the top of the infiltration
surface for more than 24 trench and dispose of it in a location that will not impact a stream
hours after a storm. or the SCM.
The trench Grass or other plants are Do not pull the weeds (may pull out media as well). Wipe them
growing on the surface of with a systemic herbicide such as glyphosate and then return
the trench. within the week to remove them by hand. (Another option is to
pour boiling water on them or steam them.)
Water present more than Clean out any clogged underdrain pipes. Consult an appropriate
Observation well three days after a storm professional for clogged soil subgrade.
event
The emergency overflow Erosion or other signs of
berm damage have occurred at Repair or replace the berm.
the outlet.
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 trench are
causing erosion or Contact the local NCDEQ Regional Office.
sedimentation in the
receiving water.

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THE MOST ADVANCED NAME IN WATER MANAGEMENT SOLUTIONS

THE ISOLATOR® ROW
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 Looking down the isolator Row from the
manhole for easy access.The fabric-wrapped chambers provide for manhole opening,woven geotextile is shown
settling and filtration of sediment as storm water rises in the Isolator between the chamber and stone base.
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 i,
the storage areas of the adjacent stone and chambers from sediment `V'' t •
accumulation. gs
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Two different fabrics are used for the Isolator Row.A woven geotextile
fabric is placed between the stone and the Isolator Row chambers. .d - -
The tough geotextile provides a media for storm water filtration and r-,
provides a durable surface for maintenance operations. It is also , r
designed to prevent scour of the underlying stone and remain intact tr•`" +�+i i+ " ` "
during high pressure jetting.A non-woven fabric is placed over the
chambers to provide a filter media for flows passing through the "`'4 A `.
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. StormTech Isolator Row with
The Isolator Row is typically designed to capture the"first flush"and Overflow Spillway(not to scale)
offers the versatility to be sized on a volume basis or flow rate basis. oPTbw L
An upstream manhole not only provides access to the Isolator Row but PRE-TREATMENT
typically includes a high flow weir such that storm water flowrates or
volumes that exceed the capacity of the Isolator Row overtop the over STORMTECH
oRou OW
flow weir and discharge through a manifold to the other chambers.
The Isolator Row may also be part of a treatment train. By treating HIM -4 ! l
storm water prior to entry into the chamber system,the service life can MANWITH = MvII,yvvl
be extended and pollutants such as hydrocarbons can be captured. OVERFLOER = ..mil )
Pre-treatment best management practices can be as simple as BIM.IM. )
deep sump catch basins,oil-water separators or can be innovative -a ;--t )
storm water treatment devices.The design of the treatment train and - ;--�� )
selection of pretreatment devices by the design engineer is often ECCENTRIC
driven by regulatory requirements.Whether pretreatment is used or not, _ MIMB.' j
the Isolator Row is recommended by StormTech as an effective means - =MEI p
to minimize maintenance requirements and maintenance costs. - MM .
Note: See the StormTech Design Manual for detailed information on - 1.1111er I)
designing inlets for a StormTech system,including the Isolator Row. OPTIONAL 0
ACCESS STORMTECH CHAMBERS
THE MOST ADVANCED NAME IN WATER MANAGEMENT SOLUTIONS'
2

�..__ ._ ISOLATOR ROW
INSPECTION/MAINTENANCE
"" 110 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
G>.00� imperviousness,climate,etc.all play a critical role in determining the
' fif actual frequency of inspection and maintenance practices.
>A,. 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 Row was designed to reduce the cost 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
bed. If inspection indicates the potential need for maintenance,access is provided via a manhole(s)located on
the end(s)of the row for cleanout. If entry into the manhole is required, please follow local and OSHA rules for a
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. Most sewer and pipe
maintenance companies have vacuum/JetVac combination vehicles.Selection of an appropriate JetVac nozzle
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.
OPPNONAL INSPECTION PORT
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SITE DESIGN ENGINEER
(11'IB00 mml MIS RECOMMENDED) TWO LAYERS OF ADS GEOSYNTHETICS OISWS WOVEN GEOTEXIEE BETWEEN
FOUNDATION STONE AND CHAMBERS.CONTINUOUS FABRIC WITHOUT SEAMS
IV(ROO mm)HOPE ACCESS PIPE REQUIRED:MU500.11W500,SC-H 0.DC-750 IO.J(11 m)LON WIDE:MCA500
121(500 mm(/OPE ACCESS PIPE REWIRED'.SC 710 US OS m)NW :MC OS®
S•(200 mm)1OPE ACCESS PIPE REWIRED.SGIBOIP S I13 m1 MW WOE:E 0LTBO.SG]IO
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ISOLATOR ROW STEP BY STEP MAINTENANCE PROCEDURES
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 log.
iv. If sediment is at or above 3 inch depth,proceed to Step 2.If not, proceed to Step 3.
B)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.
1)B) 2 1)A)
A
4
MINISNWAIII:1011111111
11111I I
SAMPLE MAINTENANCE LOG
rlil[ Sedimen t
Date Fixed point to chamber Fixed point to top of (1)-121 , u r servations/Actions Inspector
bottom(1) sediment(2)
3/15/11 6.3 fE NON! New LnsEalLa1ioK. Fixed poi Ls CI frame aE 1)3M
grade
9/24/11 6.2 0.1 fE Some 9ril feLE SM --
6/20/13 S.% 0.5 t Mucky feel, debris visible EN mNttole and in NV
yy a
Isol:dor Row, maluEenance due
7/7/13 6.3 ft o Ss1:em jetted and vacuumed IWM
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theainage•Row are registered trademarks of StormTech,Inc.
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[f[II Advanced Drainage Systems,Inc.
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