HomeMy WebLinkAboutO&M Manual 11-02-18
OPERATIONS AND MAINTENANCE MANUAL
For:
ONYXSUITES
Address:
10239 Commerce Drive, Carmel, IN 46032
Part of NE/4, Section 07, Township 17 North, Range 3 East, Clay Township, Hamilton County, IN
Project #W180330
Prepared For:
Mr. David B. Klain
DB Klain Construction, LLC
2159 Glebe Street, Suite 200
Carmel, IN 46032
Phone: (317) 846-9992
david@dbklain.com
Prepared By: Russell Webster, EIT
CheckedBy: Mark Thorpe, RLA
Certified By:Steven Scott Rucker, PE
Date:
September 21, 2018
Revised:
10505 North College Avenue |Indianapolis, IN 46280 |.www.weihe.net |(317) 846-6611 |(800) 452-6408 |Fax: (317) 843-0546
Allan H. Weihe, P.E., L.S., - Founder
Report Prepared For:
Onyx Suites
Carmel, IN
Project #W180330
TABLE OF CONTENTS
Operation and Maintenance Manual
1.Project Narrative
2.Definitions
3.Owner Acknowledgement
4.Location Maps
5.Checklist and Maintenance Activities
Existing Wet PondBMP
Mechanical Water Quality Unit (Aqua-Swirl AS-3)
Vegetated Filter Strip with Level-Spreader
ProjectNarrative
DB Klain Construction is proposing toconstruct a leasable office facility in Carmel,
Indiana. This development will include a building of leasable office spaces, walks,
associated parking and drives on around 2.7 acres of land. The site is currently vacant.
This site had previously received approval for construction of a religious use facility.
This site has been master-planned as part of the Crooked Creek Regional Detention
Basin, and as such no detention has been proposed.
Site Location:
10239 Commerce Drive, Carmel, IN 46032
Part of NE/4, Section07, Township 17 North, Range 3 East, Clay Township, Hamilton
County, IN
Floodzone:
Our site is in Flood Zone X according to the National Flood Insurance Program, on Flood
Insurance Rate Map (FIRM) 18057C0225G, dated November 19, 2014. Zone X
indicates areas of 0.2% annual chance flood; areas of 1% annual chance flood with
average depths of less than 1 foot or with drainage areas less than 1 square mile; and
areas protected by levees from 1% annual chance flood.
Stormwater Design:
The site discharges into the two wet ponds that surround it. The proposed design will pipe
the proposed runoff into storm sewer. This runoff will be treated by a mechanical water
quality unit. The areas of direct discharge will utilize a vegetated filter strip with a
granular level spreader with an under drain. Refer to Sections 3, 4and 5 for all design
information. The site has been included in the Crooked Creek Regional Detention Basin
watershed and detention will not be provided in this proposed design. Section4of this
report will detail the design of the storm sewer using the Rational Method and analyzing
the storm sewer based on a 10-year storm event.
Water Quality:
A total of three (3) BMP’s are being utilized for the site design of this project. The
extended wet pond, which is existing, is the final BMP for both onsite basins. For basin
PR-1, the first BMP is a mechanical water quality unit which has been designed for the
appropriate water quality flow rate. The basin PR-2 will utilize vegetated filter strips with
level-spreaders ahead of the wet pond BMP. Refer to Section 5 of this report for all
design information and details.
BMP Owner Contact Information:
Mr. David B. Klain
DB Klain Construction, LLC
2159 Glebe Street, Suite 200
Carmel, IN 46032
Phone: (317) 846-9992
david@dbklain.com
Definitions
Best Management Practices (BMP):
Best Management Practices, refer to structural or non-structural measures designed for
the benefit of water quality and quantity.
Urban stormwater runoff contains many types and forms of pollutants. When compared
to stormwater run-off from pre-developed conditions, high concentrations and some
contaminants that are not naturally present in surface runoff from undeveloped local
lands are found. Runoff from undeveloped watersheds contains metals, nutrients,
sediment particles, oxygen-demanding compounds, and other constituents. Once
developed, constituent loads increase because surface runoff volumes increase and the
sources of many of these pollutants also increase. Supplemental applications of
compounds, such as fertilizers, also tend to increase the availability of some pollutants to
stormwater runoff.
Runoff water quality in urban areas can be extremely detrimental to local habitat. Paved
surfaces and standing water bodies for stormwater management control elevate the
temperature of water entering streams. Chemicals in standing water and ponds are
oxidized, resulting in depressed levels of dissolved oxygen. Increased runoff volumes
and rates create scour and deposition damage to instream habitat. Activities in urbanized
areas, suchas vehicular traffic, deposit pollutants such as heavy metals and oil & grease
on paved surfaces where they easily wash off into the streams.
BMP Owner:
The owner of the BMP, typically the property owner. The BMP owner may also be the
lessee of the property in the case of long-term leases of commercial and industrial zoned
properties. The lessee is considered the bmp owner only if the lease specifically states
that construction by the lessee must meet applicable local codes and regulations.
Mechanical Water Quality Unit (Aqua-Swirl AS-3)
The Aqua-Swirl™ Stormwater Treatment System is a custom-engineered, post-
construction flow-through water quality device designed to remove coarse sediment,
debris, and free-floating oil by utilizing hydrodynamic separation technology. Aqua-
Swirl™ technology is a modular high-flow-rate treatment system that has no moving
parts and operates under gravity flow conditions within a single swirl chamber.
Wet Detention Basin:
A Wet Detention Pond is a facility, which removes sediment, biochemical oxygen
demand (BOD), organic nutrients, and trace metals from stormwater runoff. This is
accomplished by slowing down stormwater using an in-line permanent pool or pond
affection settling pollutants. The wet pond is similar to a drypond, except that a
permanent volume of water is incorporated into the design. The drainage area should be
such that as adequate base flow is maintained in the pond. Biological processes occurring
in the permanent pond pool aid in reducing the amount of soluble nutrients present in the
water such as nitrate and ortho-phosphorus.
Vegetated Filter Strip:
Vegetatedfilter strips are land areas of either planted or indigenous vegetation, situated
between a potential pollutant-source area and a surface-water body that receives runoff.
The term 'buffer strip' is sometimes used interchangeably with filter strip, but filter strip
is the preferred usage. Runoff may carry sediment and organic matter, and plant nutrients
and pesticides that are either bound to the sediment or dissolved in the water. A properly
designed and operating filter strip provides water-quality protection by reducing the
amount of sediment, organic matter, and some nutrients and pesticides, in the runoff at
the edge of the field, and before therunoff enters the surface-water body. Filter strips also
provide localized erosion protection since the vegetation covers an area of soil that
otherwise might have a high erosion potential.
Stormwater Infrastructure:
Storm water infrastructureand structures refers to structural or non-structural measures
designed for the benefit of storm water conveyance. Storm water is the rainfall/ snowmelt
that flows over our yards, streets, parking lots, and buildings and either enters the storm
drain system or runs directly into a lake or stream.
Owners of storm water infrastructure and structures are typically the property owner.
The storm water infrastructure owner may also be the lessee of the property in the case of
long-term leases of commercial and industrialzoned properties. The lessee is considered
the owner only if the lease specifically states that construction by the lessee must meet
applicable local codes and regulations
Catch basins:
Catch basin/inlet cleaning and repair has traditionally been performed to respond to
localized flooding problems in streets. Catch basins are inlets at the curb with a small trap
(usually six inches to one foot deep) below the sewer pipe. These devices help to clean
storm water because particles in street runoff settle into the trap before the water enters
the storm sewers. Catch basins require regular cleaning of the sediment trap to be. The
inlets do not trap sediments and don’t need cleaning unless they are plugged. Cleaning
for either catch basins or inlets can be doneby hand (e.g., with a clamshell or shovel) or
with a vacuum truck.
Conveyance Storm Pipes:
A good rule of thumb is to conduct inspection of storm drain inlets and otherdrainage
facilities at least once a year, prior to the beginning of the rainy season.Complete
inspections early enough so that repairs can be made during dry weather. Catch
basins/inletsshould be inspected at least once every six months. StormPipes and culverts
should be inspected every three to five years, or in response to a problem. Most agencies
inspect their sewer pipes six inches or larger with a TV camera.All other parts of the
system are inspected visually.
Look for excessive silt build-up, erosion, unusual algal growth, cracked or collapsed
pipes, misaligned joints, and other signs of problems such as a sheen on the water
surface, discolored water, or an unpleasant odor. Check with product manufacturers or
storm water handbooks for advice on what to look for when inspecting more
sophisticated treatment devices such as flow splitters and diverters. When a problem is
noted, take steps to correct the problem, or route this information immediately to the
appropriate individual(s) in your organization who can respond. If needed, develop a
good response plan to ensure quick follow-up in the future.
Inspections
Routine inspections are the responsibility of the BMP owner. Maintenance is also the
responsibility of the owner. The BMP owner shall be financially responsible for any
maintenance or repairs required by the City or its representatives during the City’s
inspections. The approval maintenance plan and inspection forms provided with this
manual should be used as guidance for performing maintenance activities. Completed
inspection forms must be maintained by the BMP owner and produced upon request by
the City. The City must be notified of any changes in BMP ownership, major repairs or
BMP failure in writing within 30 days. The letter should be addressed to:
Stormwater BMPModifications
Department of Engineering
City of Carmel
One Civic Square
Carmel, IN 46032
The City and/or its representatives have the right to enter the property to inspect BMPs.
In the event that the City finds a BMP in need of maintenance or repair, the City will
notify the BMP owner of the necessary maintenance or repairs and give the landowner a
timeframe for completing the maintenance or repairs. If the maintenance or repairs are
not completed within the designated timeframe, the City shall perform the maintenance
or repairs and bill the landowner for the actual costs for the work.
Inspection & Maintenance Activities
Refer to the checklist provided with this manual for operation, maintenance and
inspection of BMP and storm water infrastructure. The checklist is for the use of the
BMP owner in performing routine inspections. The City will perform annual inspections
of BMPs, using similar checklist. The BMP owner must maintain and update the BMP
operations and maintenance plan. At a minimum, the operations and maintenance plan
must include, but is not limitedto:
1.Visuallyinspect and removal of debris from inlet, outlet, and sump structures
2.Removal of woody vegetation from the embankments
BMP owners must routinely inspect BMPs to verify that all BMP components are
functioning as designed and are not in danger of failing. All BMPs need maintenance to
function as water quality and quantity enhancements. Maintenance can range from
dredging sediment out of the treatment area to mowing grass.
The BMP owner agrees to the maintenance and inspection programs attached with this
manual.Inspections must be documented on the inspection forms included in this
Operation and Maintenance Manual.
A self-monitoring program by the project site owner is required during construction and
during a maintenance schedule of any project described. A trained individual employed
or retained by the project site owner shall prepare and maintain a written evaluation of
the project site by the end of the next business day following each measurable Inspection.
Inspection during construction should be after a storm event and at a minimum, one (1)
time a week.
Inspection during the maintenance schedule must routinely inspect all storm water
infrastructureto verify that all components are functioning as designed and are not in
danger of failing. They should be inspecteda minimum of an annual basis or upon
observed failure.
Requirements regarding the submittal of annual inspection reports to
the City of Carmel Engineering Department:
The first report is due one year after construction is completed, with subsequent reports
due each year within the same month of the initial report. If there are any deficiencies
found during the inspection, these should be addressed. If the inspection report is not
received within the month it is due, if there are deficiencies which were not included in
the report, or if any deficiencies included in the report are not addressed in a timely
manner, the BMP owner faces enforcement action from the City.
Owner Acknowledgment
This Operation and Maintenance Manualis submitted to the City of Carmelwith the
intent to insure the longevity and adequatefunctioning of the BMP Wet Detention Basin,
Mechanical Water Quality Unit (Aqua-Swirl AS-3), and Vegetated Filter Strips. By
submitting this Operation and Maintenance Manual to the City of Carmel’sOffice with
plans to maintain a BMP BMP Wet Detention Basin, Mechanical Water Quality Unit
(Aqua-Swirl AS-3), and Vegetated Filter Stripsthe BMP owner noted above agrees to
follow and abide by the inspection schedule and maintenance activities listed in this
manual. The BMP owner noted above is responsible for any additional maintenance
and/or repair activities to maintain the function and longevity of the BMP(s).
_____________________________________________________________
Owner Signature:Date
_______________________________
Printed
STATE OF INDIANA)
)SS:
COUNTY OF )
BEFORE ME, the undersigned, a Notary Public in and for said County and State,
personally appeared Owners,/Agent,
subscribed and sworn before me this day of ,.
County of ResidenceSignature
Commission Expiration DatePrinted Name
LOCATION MAP–NO SCALE
DENOTES PROJECT LOCATION
Aqua-Swirl™ Inspection Procedure 3
Aqua-Swirl™ Cleanout Procedure 4
Swirl Pretreatment Chamber 7
Aqua-Filter™ Filtration Chamber 7
Filter Media Disposal 9
System Maintenance
The long-term performance of the stormwater
treatment structures (including
manufactured systems, ponds,
swales, etc.), and the effective
protection of receiving waters,
depends on a consistent
maintenance plan. Inspection
and maintenance functions
are simple and easy for the
AquaShield™ Stormwater
Treatment Systems allowing
all inspections to be
performed from the surface.
An AquaShield™ field
representative will be available as
needed to assist local maintenance
personnel in the field. Please contact us for a
copy of a product-specific “Inspection and Maintenance Manual”.
It is important that a routine inspection and maintenance program be established
for each unit based on (1) the volume or load of the contaminants of concern,
(2) the frequency of releases of contaminants at the facility or location, and (3)
the nature of the area being drained.
In order to ensure that our
systems are being maintained
properly, AquaShield™ offers
a maintenance solution to
all of our customers. We
will arrange to have
maintenance performed.
2
System Maintenance
All AquaShield™ products can be inspected from the surface, eliminating the
need to enter the systems to determine when cleanout should be performed.
In most cases, AquaShield™ recommends a quarterly inspection of the
Stormwater Treatment Systems for the first year of operation to develop an
appropriate schedule of maintenance.
Based on experience of the system’s first year in operation, we recommend that
the inspection schedule be revised to reflect the site-specific conditions
encountered. Typically, the inspection schedule for subsequent years is reduced
to semi-annual inspection.
The Aqua-Swirl™has been designed to minimize and simplify the inspection and
maintenance process. The system can be inspected and maintained completely
from the surface, thereby eliminating the need for confined space entry.
Furthermore, the entire structure (specifically, the floor) is accessible for visual
inspection from the surface. There are no areas of the structure that are blocked
from visual inspection or periodic cleaning.
Inspection of any free-floating oil and floatable debris can be directly observed
and maintained through the manhole access provided directly over the swirl
chamber.
To inspect the Aqua-Swirl™, a hook is needed to remove
the manhole cover. AquaShield™ provides a customized
manhole cover with our logo to make it easy for
maintenance crews to locate the system in the field. We
also provide a permanent metal information plate attached
inside the access riser, which provides our contact
information, the Aqua-Swirl™ model size, and serial
number.
3
System Maintenance
The only tools needed to inspect the Aqua-Swirl™ system are a flashlight and a
measuring device such as a stadia rod or pole. Given the tremendous
accessibility provided, floating oil and debris can be observed directly from the
surface. Sediment depths can easily be determined
by lowering a measuring device to the top of the
sediment pile and to the surface of the water.
When the sediment pile is within 30 to 36 inches of
the water surface, the system should be
maintained.
It should be noted that in order to avoid
underestimating the volume of sediment in the
chamber, the measuring device must be carefully
lowered to the of the sediment pile. The finer
sediment at the top of the pile, typically offers less
resistance to the measuring device than the larger
particles.
Clean out of the Aqua-Swirl™ is simple. Free-floating oil
and floatable debris can be observed and removed directly
through the 30-inch service access provided.
A vacuum truck can be used to remove the accumulated
sediment and debris. It is important to note that the entire
sediment storage area can be reached with a vacuum hose
from the surface (reaching all the sides).
Disposal of the material is typically treated in the same
fashion as catch basin cleanouts. AquaShield™
recommends that all materials removed be handled and
disposed of in accordance with local and state requirements.
4
System Maintenance
Location:
5
System Maintenance
Inspector: Date:
Location: Time:
Visible Evidence of Spills/ Releases (oils, grease, fuels, paints, chemicals):
Visible Evidence of Heavy Sediment Deposition:
Condition of Swirl:
Condition of Baffle:
Distance to Sediment:
Distance to Water:
**Note: If sediment is less than 30 to 36 inches below water surface, sediment
should be removed.
Approx. Volume:
Description:
Elapsed Removal Time:
Approx. Volume:
Description:
Elapsed Removal Time:
6
System Maintenance
Proper maintenance of the Aqua-Filter™ system is needed for the unit to operate
efficiently. Typically, inspection of the Aqua-Swirl™ pretreatment chamber and
the filtration chamber should be performed on a quarterly basis. Information
gathered during the first year of service can be used to create a maintenance
plan appropriate for the site.
The Aqua-Swirl™ is easily
inspected from the surface.
Floating debris and free oil can
be observed along with the
captured stormwater by
removing the manhole cover.
Sediment depth is determined by
lowering a measuring device
(e.g. stadia rod) to the top of the
sediment pile.
When the sediment pile is within
30 to 36 inches from the water
surface, cleaning is required.
Typically, a vacuum truck is used
to first remove the captured
floating materials from the water’s surface before lowering the vac-hose into the
accumulated sediment pile for its removal.
The filter media is also easily observed from the surface. Manhole covers are
spaced over the entire filtration bed to provide easy access. AquaShield™
provides a customized manhole cover with our logo to make it easy for
maintenance crews to locate the system in the field.
7
System Maintenance
Initially, the filter media is light tan or white in color. When the media color turns
black, it has become saturated due to pollutant loading and requires
replacement. Call toll free (888) 344-9044 to order replacement filters.
An entry riser provides direct access
into the filtration chamber with a
permanent ladder welded into the
downstream section of the chamber.
This additional access allows for the
vacuuming of any standing water and
an unobstructed walkway to the
downstream side of the filter bed.
Replacement of the filtration media
typically requires entry into the
filtration chamber by one of a two-
member maintenance crew. Confined
space entry precautions should be
taken by the maintenance crew when
removing and replacing the filters.
The spent filter containers are normally retrieved from the filter chamber by a
second crewmember at the surface through the multiple 30-inch risers spaced
across the top of the filter bed. In addition, the filter containers can be accessed
directly from within the filtration chamber via a vertical removable panel at the
rear of the filter bed.
The center row of the filtration bed has been
fitted with one inch thick removable fiberglass
grate panels. This allows for a six-foot tall
walkway down the center of the chamber,
providing easy access to the full length of the
filtration chamber.
Rows of removable side grates are positioned
on both sides of the center row. After the
center grate panel has been removed, the
filter media can be lifted from these side grate
panels.
After the removable sides have been loaded
with replacement filter containers, the
removable center grates are repositioned and
locked in place. New filters are installed in a
criss-cross manner to prevent short-circuiting.
8
System Maintenance
The filter media does not allow captured contaminants to be released once
absorbed into the material. This is a unique quality of the Aqua-Filter™, allowing
superior performance under extreme conditions.
The spent filters and
sediment generally do not
require any special
treatment or handling for
disposal. The filtration
media can be recycled as
fuel material, or sent to a
subtitle D landfill.
AquaShield™ recommends
that all materials removed
during the maintenance
process be handled and
disposed of in accordance
with local and state
requirements.
9
Stormwater Post-Development
Control Measure Maintenance
Self Inspection Check List
For Vegetated Filter Strip
Date:_____________ Time:______________ Permit # :______________
Inspection done by:________________________________________________
I.PROJECT INFORMATION
1.Year Installed: _____________________________
2.Project Type: Single Family ResidentialMulti-Family Residential
Industrial CommercialOther___________________________________
3.Facility Name:______________________________________________________________________
Site Address: ______________________________________________________________________
II.CONTROL MAINTENANCE ACTIVITY ITEMS
Mowed grass to maintain a height of 2 to 4 inches
Used integrated pest management (IPM) techniques to reduce use of chemical pesticides
and herbicides.
Removed trash and debris from the filter strip
Inspected swale for sign of erosion, vegetation damage/coverage, channelization problems,
debris build-up and excessive sedimentation on the surface of the strip.
Removed sediment in inlet areas, channels, culverts, and outlets whenever flow into the filter
strip is retarded or blocked.
Repaired ruts or holes in the channel by removing vegetation, adding and tamping suitable soil,
and reseeding. Replaced damaged vegetation.
Inspected filter strip for obstructions (e.g., debris accumulation, invasive vegetation) and pools
of standing water that can provide mosquito-breeding habitat. Corrected observed problems.
Reconstructed or replaced the control measure when it no longer functioning properly.
Facility Representative:___________________________________
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List.xls1/20/2011
Inspection and Maintenance Checklist
Wetponds
Site Name:
Owner Name:
Owner Address:
Owner Phone Number:
Emergency Phone Number:
Location:
Date:
Time:
Inspector:
Change in ownership since
Y OR N
last inspection?
Maintenance ItemMaintenance (1 or 2)*Maintenance is needed:Comments
Water Level
First cell is empty, doesn't hold water.
Trash and debris > 5cf per 1,000 sf (one standard size
Trash and Debris
garbage can
Inlet/Outlet pipe clogged with sediment and/or debris
Inlet/Outlet Pipe
material.
Accumulated sediment reached 8' below normal pool
Sediment Accumulation in
elevation.
Pond Bottom/Dredging
Accumulated sediment reached 8' below normal pool
Water Level
elevation.
Oil Sheen on Water
Prevalent and visible oil sheen.
Erosion
Erosion of the pond's side slops and/or scouring of the pond
bottom, that exceeds 6-inches, or where continued erosion is
prevalent.
Settlement of Pond
Dike/Berm
Any part of these components that has settled 4-inches or
lower than the design elevation, or inspector determines
dike/berm is unsound.
Internal Berm
Berm dividing cells should be level.
Overflow Spillway
Rock is missing and soil is exposed at top of spillway or
outside slope.
Debris Barriers (e.g., Trash Racks)
Trash and Debris
Trash or debris that is plugging more than 20% of the
openings in the barrier.
Damaged/Missing BarsBars are bent out of shape more than three inches
Bars are missing or entire barrier missing.
Bars are loose and rust is causing 50% deterioration to any
part of barrier.
Inlet/Outlet PipeDebris barrier missing or not attached to pipe.
Misc.
Vegetation that reduces free movement of water through the
Vegetation
ditches
Erosion Damage to Slopes
and Channel Bottom
Eroded damage over 2 inches deep where cause of damage is
still present or where there is potential for continued erosion
Any erosion observed on a compactedberm embankment
*Maintenance: Enter 1 if maintenance is needed and include WO#. Enter 2 if maintenance was performed same day.
Inspection and Maintenance Checklist
Catch Basins, Manholes, and Inlets
Site Name:
Owner Name:
Owner Address:
Owner Phone Number:
Emergency Phone Number:
Location:
Date:
Time:
Inspector:
Change in ownership since
Y OR N
last inspection?
Maintenance ItemMaintenance (1 or 2)*Maintenance is needed:Comments
Trash or debris which is located immediately in
Trash & Debris
front of the catch basin opening or is blocking
inletting capacity of the basin by more than
10%
Trash or debris (in the basin) that exceeds 60
percent of the sump depth as measured from the
bottom of basin to invert of the lowest pipe into
or out of the basin, but in no case less than a
minimum of six inches clearance from the
debris surface to the invert of the lowest pipe.
Trash or debris in any inlet or outlet pipe
blocking more than 1/3 of its height.
Dead animals or vegetation that could generate
odors that could cause complaints or dangerous
gases (e.g., methane).
SedimentSediment (in the basin) that exceeds 60 percent
of the sump depth as measured from the bottom
of basin to invert of the lowest pipe into or out
of the basin, but in no case less than a minimum
of 6 inches clearance from the sediment surface
to the invert of the lowest pipe.
Top slab has holes larger than 2 square inches
Structure Damage to Frame and/or
or cracks wider than 1/4 inch (Intent is to make
Top Slab
sure no material is running into basin).
Frame not sitting flush on top slab, i.e.,
separation of more than 3/4 inch of the frame
from the top slab. Frame not securely attached
Maintenance person judges that structure is
Fractures or Cracks in Basin
unsound.
Walls/Bottom
Grout fillet has separated or cracked wider than
1/2 inch and longer than 1 foot at the joint of
any inlet/outlet pipe or any evidence of soil
particles entering catch basin through cracks.
If failure of basin has created a safety, function,
Settlement/Misalignment
or design problem.
VegetationVegetation growing across and blocking more
than 10% of the basin opening.
Vegetation growing in inlet/outlet pipe joints
that is more than six inches tall and less than six
inches apart.
Contaminants and PollutionAny evidence of oil, gasoline, contaminants or
other pollutants (Coordinate removal/cleanup
with local water quality response agency).
Catch Basin CoverCover is missing or only partially in place. Any
open catch basin requires maintenance.
Mechanism cannot be opened by one
maintenance person with proper tools. Bolts
into frame have less than 1/2 inch of thread.
r
One maintenance person cannot remove lid afte
applying normal lifting pressure (Intent is to
keep cover from sealing off access to
maintenance).
LadderLadder is unsafe due to missing rungs, not
securely attached to basin wall, misalignment,
rust, cracks, or sharp edges.
Metal GratesTrash and debris that is blocking more than
20% of grate surface inletting capacity.
TABLE 701-1: Pre-approved Post-construction BMPs