HomeMy WebLinkAboutO&M Manual (V2) 03-24-2010505 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
OPERATIONS AND MAINTENANCE MANUAL
For: CARMEL SELF STORAGE CENTER
Approximately 4.3 acres
147 & 155 West Carmel Drive
Part of SE/4, Section 36, Township 18 North, Range 3 East, Clay Township, Hamilton County, IN
Project W190582
Prepared For:
Jim Adams
Adams French Property, LLC
9000 Keystone Crossing, Suite 660
Indianapolis, IN 46240
Phone: (317) 733-640
jadams@filcoltd.com
Prepared By: Russell L. Webster II, P.E.
Checked By: Brad Schoeff
Certified By: Russell L. Webster II, P.E.
Date:
December 17, 2019
Revised:
March 24, 2020
Report Prepared For:
Carmel Self-Storage Center
Carmel, IN
Project #W190582
TABLE OF CONTENTS
Operation and Maintenance Manual
1. Project Narrative
2. Definitions
3. Owner Acknowledgement
4. Location Maps
5. Checklist and Maintenance Activities
• Mechanical Water Quality Unit (Hydro International FD HC-8)
• Dry Pond with Native Plantings
Project Narrative
Carmel Self Storage is proposing to demolish and reconstruct their existing building on their site on
West Carmel Drive. The proposed building will be a better match for the current architectural
requirements in the area and will bring the new building closer to the right-of-way.
The stormwater design for this project is challenging. The site is 95% impervious today and has been
since approximately 1980 when the site was built-out fully. The outlet pipe for the site is one 12” storm
sewer which handles onsite flows and underdrains from onsite and offsite. Said outlet pipe is less than 3’
deep. Because the site is fully built-out, there is minimal room to consider detention and water quality.
However, disturbing more than 0.25 acres triggers these requirements per the UDO.
The owner is removing and replacing the north office and storage building but will not be removing any
self-storage buildings. Most of the southern part of the site containing these self-storage buildings sheet
flow to the west towards the existing outlet pipe. The owner understands there is not adequate elevation
to rip out pavement and install underground detention, nor will they remove any of the existing storage
buildings to provide detention.
However, the owner will remove asphalt to accommodate as much detention as the western edge of the
site will allow. This area will not provide enough detention to satisfy the UDO. The city engineering
staff has directed that we design the pond to at least accommodate detention storage for the increased
building area, which is about 0.30 acres.
The owner is willing to provide water quality for the entire site by using a water quality unit. The owner
has also selected a dry pond with native plantings for detention to incorporate green infrastructure into
the redevelopment.
Site Location:
Approximately 4.3 acres located at 147 & 155 West Carmel Drive
Part of SE/4, Section 36, Township 18 North, Range 3 East, Clay Township, Hamilton County, IN
Floodzone:
The site does not lie in a Special Flood Hazard Area as established by the Federal Emergency
Management Agency - National Flood Insurance Program, when plotted by scale on Flood Insurance
Rate Map #18057C0209 G, dated November 19, 2014.
BMP Owner Contact Information:
Jim Adams
Adams French Property, LLC
9000 Keystone Crossing, Suite 660
Indianapolis, IN 46240
Phone: (317) 733-640
jadams@filcoltd.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, such as 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 (Hydro International FD HC-8)
The First Defense® High Capacity is an enhanced vortex separator that combines an effective
stormwater treatment chamber with an integral peak flow bypass. It efficiently removes sediment total
suspended solids (TSS), trash and hydrocarbons from stormwater runoff without washing out previously
captured pollutants. Refer to the appendix of this manual for maintenance information.
Dry Detention Basin with Native Plantings:
A dry detention basin is an impoundment or excavated basin for the short-term detention of stormwater
runoff from a completed development that allows a controlled release from the structure at downstream,
pre-development flow rates. Conventional dry detention basins typically control peak runoff for 2-year
and 10-year 24-hour storms. They are not specifically designed to provide extended dewatering times,
wet pools, or groundwater recharge. The pond bottom will be planted with Native Plantings. There are a
couple of key ways in which native plants support water quality. Native plants help reduce stormwater
runoff. The deep roots of native plants are adapted to the soil and terrain conditions of the Lake George
watershed. So they absorb and filter runoff more effectively than the short roots of many turf grasses and
other ornamental plants. Native plants decrease the potential for harmful substances entering ponds. In
addition, because native plants have evolved in environmental conditions like those in the watershed,
they are adapted to survive here without extra fertilizers, pesticides and watering. Performing
preventative maintenance regularly will prevent long term damage and reduce costs. It is recommended
inspections be performed bi-annually and after major storm events. See below for information on
mowing in the first 2 years.
Stormwater Infrastructure:
Storm water infrastructure and 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 industrial zoned 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 done by 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 other drainage 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/inlets should be inspected at least once every six months.
Storm Pipes 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 BMP Modifications
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 limited to:
1. Visually inspect 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 infrastructure to
verify that all components are functioning as designed and are not in danger of failing. They should be
inspected a minimum of an annual basis or upon observed failure.
Maintenance in the First Two Years: Mowing Back the Weeds
Most native grasses grow slowly and require two or more years to reach full development. Annual and
biennial weeds are often a problem in the first two years, but you can control them by mowing. Keep
weeds mowed to a height of 6 inches early in the first year and at 12 inches later in the year if the native
grasses grow higher than six inches tall. Mow just above the tops of the native grasses. This prevents the
weeds from smothering the smaller grass seedlings. Expect to mow two to three times in the first year.
Do not allow the weeds to grow over 12 inches tall before mowing, or the mowed material can smother
the small seedlings.
In the second year, mow in early June at a height of 12 inches. This will knock back annual and biennial
weeds. Many native grasses will begin to grow vigorously in the second growing season, and some may
flower (side oats grama and Canada wild rye often bloom late in the second year). If weeds continue to
be a problem later in the second year, mow again just above the tops of the prairie grasses. A flail type
mower works best, as it chops up the material so that it dries rapidly without smothering the smaller
grass seedlings below. Rotary mowers often lay down the cuttings in piles, which can smother the young
prairie plants.
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 Manual is submitted to the City of Carmel with the intent to insure the
longevity and adequate functioning of the BMP Dry Detention Basin with Native Plantings and
Mechanical Water Quality Unit (Hydro International FD HC-8) with Diversion Structure. By submitting
this Operation and Maintenance Manual to the City of Carmel’s Office with plans to maintain a BMP
Dry Detention Basin With Native Plantings and Mechanical Water Quality Unit (Hydro International
FD HC-8) with Diversion Structure, the 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 Residence Signature
Commission Expiration Date Printed Name
LOCATION MAP – NO SCALE
DENOTES PROJECT LOCATION
Site Name:
Owner Name:
Owner Address:
Owner Phone Number:
Emergency Phone Number:
Location:
Date:
Time:
Inspector:
Change in ownership since
last inspection?
Maintenance Item Maintenance (1 or 2)* Maintenance is needed: Comments
Sediment & Debris Accumulated sediment exceeds buildup 1/4" of the
pipe diameter up to maximum of 6"
Vegetation Vegetation that reduces free movement of water
through the pipes
Protective coating is damaged; rust is causing more
than 50% deterioration to any part of the pipe
Any dent that decreases the cross section area of pipe
by more than 20% or puncture that impacts
performance
*Maintenance: Enter 1 if maintenance is need and include WO#. Enter 2 if maintenance was performed same day.
Inspection and Maintenance Checklist
Y OR N
Damaged Pipe
Conveyance Stormwater Pipe
SECTION A-A
PARTS LIST
SIZEDESCRIPTIONITEM
I.D. PRECAST MANHOLE1
INTERNAL COMPONENTS
(PRE-INSTALLED)
2
FRAME AND COVER (ROUND)3
OUTLET PIPE(BY OTHERS)4
INLET PIPE(BY OTHERS)5
A A
ANY WARRANTY GIVEN BY HYDRO INTERNATIONAL WILL APPLY ONLY TO THOSE ITEMS SUPPLIED BY IT. ACCORDINGLY HYDRO INTERNATIONAL CANNOT ACCEPT ANY RESPONSIBILITY FOR ANY STRUCTURE, PLANT, OR EQUIPMENT, (OR THE PERFORMANCE THERE OF) DESIGNED, BUILT, MANUFACTURED, OR SUPPLIED BY ANY THIRD
PARTY. HYDRO INTERNATIONAL HAVE A POLICY OF CONTINUOUS DEVELOPMENT AND RESERVE THE RIGHT TO AMEND THE SPECIFICATION. HYDRO INTERNATIONAL CANNOT ACCEPT LIABILITY FOR PERFORMANCE OF ITS EQUIPMENT, (OR ANY PART THEREOF), IF THE EQUIPMENT IS SUBJECT TO CONDITIONS OUTSIDE ANY DESIGN
SPECIFICATION. HYDRO INTERNATIONAL OWNS THE COPYRIGHT OF THIS DRAWING, WHICH IS SUPPLIED IN CONFIDENCE. IT MUST NOT BE USED FOR ANY PURPOSE OTHER THAN THAT FOR WHICH IT IS SUPPLIED AND MUST NOT BE REPRODUCED, IN WHOLE OR IN PART, WITHOUT PRIOR PERMISSION IN WRITING FROM HYDRO
INTERNATIONAL.
WEIGHT:
N/A
SHEET SIZE:
B
SHEET:
1 OF 1
DRAWING NO.:
REFERENCE NUMBER:
hydro-int.com
HYDRO INTERNATIONAL
Rev:
-
DRAWN BY:
ER
Title
CHECKED BY: APPROVED BY
DATE:SCALE:
NTS
COMMENTS:
PROJECTION
MATERIAL:
IF IN DOUBT ASK
REVISION HISTORY
REV BY DESCRIPTION DATE
-FIRST RELEASE
1. MANHOLE WALL AND SLAB
THICKNESSES ARE NOT TO
SCALE.
2. CONTACT HYDRO
INTERNATIONAL FOR A
BOTTOM OF STRUCTURE
ELEVATION PRIOR TO
SETTING DOWNSTREAM
DEFENDER MANHOLE.
PRODUCT SPECIFICATION:
1.PEAK HYDRAULIC FLOW:
2.MIN SEDIMENT STORAGE CAPACITY:
3.OIL STORAGE CAPACITY:
4.MAXIMUM INLET/OUTLET PIPE DIAMETERS: 48 in. (1200 mm)
5.THE TREATMENT SYSTEM SHALL USE AN INDUCED VORTEX TO
SEPARATE POLLUTANTS FROM STORMWATER RUNOFF.
GENERAL NOTES :
1.General Arrangement drawings only. Contact Hydro International for site
specific drawings.
2.Inlet/outlet pipe angle can vary to align with drainage network (refer to
project plans)
3.Peak flow rate and minimum height limited by available cover and pipe
diameter.
1
1
3
22
Pipe DetailsPIPE MATERIAL LENGTH INV IN INV OUT SLOPEOUTLETft%INLET 1 ft %INLET 2 ft %INLET 3 ft %INLET 4 ft %
The Water Quality Unit (WQU) shown on the plans has been designed
specifically for this project. WQU substitutions will not be allowed unless
written approval by the Engineer of Record prior to the Bid. The WQU
must be housed in a Precast Concrete Structure, and must meet (at a
minimum) the Treated Flow Rate and Bypass Flow Rate shown on this
detail.
Flow Rates per City of Knoxville Land Development Manual (January
2018):
o SPAP Flow: 1.88 cfs
o First Flush Flow: 0.94 cfs
The Water Quality Unit (WQU) shown on the plans has been designed
specifically for this project. WQU substitutions will not be allowed unless
written approval by the Engineer of Record prior to the Bid. The WQU must be
housed in a Precast Concrete Structure, and must meet (at a minimum) the
Treated Flow Rate and Bypass Flow Rate shown on this detail.
Flow Rates per Knox County Approved Proprietary BMP Devices (February
2018):
o Treatment Flow: 4FDHC - 1.50 cfs
HYDRO FRAME AND
COVER (INCLUDED)
GRADE RINGS BY OTHERS
AS REQUIRED
WEIR: CONTACT HYDRO
5
4
NOTE: ADDITIONAL HEIGHT MAY BE
REQUIRED DEPENDING ON PIPE SIZE
NOTE:
NOT FOR CONSTRUCTION. CONTACT
HYDRO FOR SITE SPECIFIC DETAIL.
MAX PIPE SIZE MAY NOT BE POSSIBLE IN
OFFLINE CONFIGURATION.
DIVERSION
STRUCTURE
BY OTHERS
DIVERSION
STRUCTURE
BY OTHERS
Site:
Structure No:
8.49 cfs 2.8 yd31120 gal
RIM: 829.2 FT
OUTLET 824.06 FT
SUMP: 816.66 FT
88.8"
30
12
12 20_12_0914
3/12/2020websterr@weihe.net
(in)
96
150.48"
8 FT FIRST DEFENSE®
HIGH CAPACITY
Carmel Self Storage
1000
Operation and Maintenance Manual
First Defense® and First Defense®High Capacity
Vortex Separator for Stormwater Treatment
First Defense® Operation and Maintenance Manual
Hydro International (Stormwater), 94 Hutchins Drive, Portland ME 04102
Tel: (207) 756-6200 Fax: (207) 756-6212 Web: www.hydro-int.com
Table of Contents
3 First Defense® by Hydro International
-Introduction
-Operation
-Pollutant Capture and Retention
4 Model Sizes & Configurations
-First Defense® Components
5 Maintenance
-Overview
-Maintenance Equipment Considerations
-Determining Your Maintenance Schedule
6 Maintenance Procedures
-Inspection
-Floatables and Sediment Clean Out
8 First Defense® Installation Log
9 First Defense® Inspection and Maintenance Log
COPYRIGHT STATEMENT: The contents of this manual, including the graphics contained herein, are intended for the use of the recipient to whom the
document and all associated information are directed. Hydro International plc owns the copyright of this document, which is supplied in confidence. It
must not be used for any purpose other than that for which it is supplied and must not be reproduced, in whole or in part stored in a retrieval system or
transmitted in any form or by any means without prior permission in writing from Hydro International plc. First Defense® is a trademarked hydrodynamic
vortex separation device of Hydro International plc. A patent covering the First Defense® has been granted.
DISCLAIMER: Information and data contained in this manual is exclusively for the purpose of assisting in the operation and maintenance of Hydro
International plc’s First Defense®. No warranty is given nor can liability be accepted for use of this information for any other purpose. Hydro International
plc has a policy of continuous product development and reserves the right to amend specifications without notice.
Page | 2
Hydro International (Stormwater), 94 Hutchins Drive, Portland ME 04102
Tel: (207) 756-6200 Fax: (207) 756-6212 Web: www.hydro-int.com
Trash, sediment and polluted water is stored inside treatment
systems until they are removed by our team with a vactor truck.
Sometimes teams must physically enter the system chambers
in order to prepare the system for maintenance and install any
replacement parts. Services include but are not limited to:
•Solids removal
•Removal of liquid pollutants
•Replacement media installation (when applicable)
Sanitation services providers not intimately familiar with stormwater
treatment systems are at risk of the following:
Leave the Dirty Work to us
Hydro International has been engineering stormwater treatment systems for over 30 years. We understand the mechanics of remov-
ing pollutants from stormwater and how to keep systems running at an optimal level.
Avoid Service Negligence
•Inadvertently breaking parts or failing to clean/replace system compo-
nents appropriately.
•Charging you for more frequent maintenance because they lacked the
tools to service your system properly in the first place.
•Billing you for replacement parts that might have been covered under
your Hydro warranty plan
•Charging for maintenance that may not yet have been required.
Hydro Maintenance Services
Nobody Knows our Systems Better than we do
First Defense® Operation and Maintenance Manual
Better Tools, Better Results
Make sure you’re not paying for service that is covered under your warranty plan. Only Hydro International’s service teams can identify
tune-ups that should be on us, not you.
Not all vactor trucks are created equal. Appropriate tools and suction power are needed to service stormwater systems appropriately.
Companies who don’t specialize in stormwater treatment won’t have the tools to properly clean systems or install new parts.
Service Warranty
LEARN MORE AT HYDRO-INT.COM/SERVICE
•Stormwwater filters
•Stormwater separators
•Baffle boxes
•Biofilters/biorention systems
•Storage structures
•Catch basins
•Stormwater ponds
•Permeable pavement
Treatment Systems Serviced by Hydro:
SAVE TIME & MONEY: CALL HYDRO FOR A QUOTE
1 (888) 382-7808
First Defense® Operation and Maintenance Manual
First Defense® Operation and Maintenance Manual
I. First Defense
® by Hydro International
Page | 3
Introduction
The First Defense® is an enhanced vortex separator
that combines an effective and economical stormwater
treatment chamber with an integral peak flow bypass. It
efficiently removes total suspended solids (TSS), trash and
hydrocarbons from stormwater runoff without washing out
previously captured pollutants. The First Defense® is available
in several model configurations (refer to Section II. Model
Sizes & Configurations, page 4) to accommodate a wide
range of pipe sizes, peak flows and depth constraints.
Operation
The First Defense® operates on simple fluid hydraulics. It is self-
activating, has no moving parts, no external power requirement
and is fabricated with durable non-corrosive components.
No manual procedures are required to operate the unit and
maintenance is limited to monitoring accumulations of stored
pollutants and periodic clean-outs. The First Defense® has
been designed to allow for easy and safe access for inspection,
monitoring and clean-out procedures. Neither entry into the
unit nor removal of the internal components is necessary for
maintenance, thus safety concerns related to confined-space-
entry are avoided.
Pollutant Capture and Retention
The internal components of the First Defense® have been
designed to optimize pollutant capture. Sediment is captured
and retained in the base of the unit, while oil and floatables
are stored on the water surface in the inner volume (Fig.1).
The pollutant storage volumes are isolated from the built-in
bypass chamber to prevent washout during high-flow storm
events. The sump of the First Defense® retains a standing
water level between storm events. This ensures a quiescent
flow regime at the onset of a storm, preventing resuspension
and washout of pollutants captured during previous events.
Accessories such as oil absorbent pads are available for
enhanced oil removal and storage. Due to the separation
of the oil and floatable storage volume from the outlet, the
potential for washout of stored pollutants between clean-outs
is minimized.
•Inlet options include surface grate or multiple inlet pipes
•Integral high capacity bypass conveys large peak flows without
the need for “offline” arrangements using separate junction
manholes
•Proven to prevent pollutant washout at up to 500% of its
treatment flow
•Long flow path through the device ensures a long residence
time within the treatment chamber, enhancing pollutant settling
•Delivered to site pre-assembled and ready for installation
Advantages
•Stormwater treatment at the point of entry into the drainage line
•Sites constrained by space, topography or drainage profiles
with limited slope and depth of cover
•Retrofit installations where stormwater treatment is placed on or
tied into an existing storm drain line
•Pretreatment for filters, infiltration and storage
Applications
Oil Max Oil
Storage Depth
Sediment
StorageSediment
Fig.1 Pollutant storage volumes in the First Defense®.
First Defense® Operation and Maintenance Manual
Hydro International (Stormwater), 94 Hutchins Drive, Portland ME 04102
Tel: (207) 756-6200 Fax: (207) 756-6212 Web: www.hydro-int.com
1
4
6
7
2
3
5
8
II. Model Sizes & Configurations
The First Defense® inlet and internal bypass arrangements are available in several model sizes and configurations. The components
of the First Defense®-4HC and First Defense®-6HC have modified geometries as to allow greater design flexibility needed to
accommodate various site constraints.
Page | 4
First Defense® Components
1. Built-In Bypass
2. Inlet Pipe
3. Inlet Chute
4. Floatables Draw-off Port
5. Outlet Pipe
6. Floatables Storage
a.b.
12
3
4
5
6
7
8
(not pictured)
Fig.2a) First Defense®-4 and First Defense®-6; b) First Defense®-4HC and First Defense®-6HC, with higher capacity dual internal
bypass and larger maximum pipe diameter.
All First Defense® models include the internal components that are designed to remove and retain total suspended solids (TSS),
gross solids, floatable trash and hydrocarbons (Fig.2a - 2b). First Defense® model parameters and design criteria are shown in
Table 1.
7. Sediment Storage
8. Inlet Grate or Cover
First Defense®
High Capacity
Model
Number
Diameter
Typical TSS Treatment
Flow Rates Peak
Online
Flow Rate
Maximum
Pipe
Diameter1
Oil Storage
Capacity
Typical
Sediment
Storage
Capacity2
Minimum
Distance from
Outlet Invert to
Top of Rim3
Standard
Distance
from Outlet
Invert to
Sump
Floor
NJDEP
Certified 106µm
(ft / m)(cfs / L/s)(cfs / L/s)(cfs / L/s)(in / mm)(gal / L)(yd3 / m3)(ft / m)(ft / m)
FD-3HC 3 / 0.9 0.84 / 23.7 1.60 / 45.3 15 / 424 18 / 457 125 / 473 0.4 / 0.3 2.0 - 3.5 / 0.6 - 1.0 3.71 / 1.13
FD-4HC 4 / 1.2 1.50 / 42.4 1.88 / 50.9 18 / 510 24 / 600 191 / 723 0.7 / 0.5 2.3 - 3.9 / 0.7 - 1.2 4.97 / 1.5
FD-5HC 5 / 1.5 2.34 / 66.2 2.94 / 82.1 20 / 566 24 / 609 300 / 1135 1.1 / .84 2.5 - 4.5 / 0.7 - 1.3 5.19 / 1.5
FD-6HC 6 / 1.8 3.38 / 95.7 4.73 / 133.9 32 / 906 30 / 750 496 / 1,878 1.6 / 1.2 3.0 - 5.1 / 0.9 - 1.6 5.97 / 1.8
FD-8HC 8 / 2.4 6.00 / 169.9 7.52 / 212.9 50 / 1,415 48 / 1219 1120 / 4239 2.8 / 2.1 3.0 - 6.0 / 0.9 -1.8 7.40 / 2.2
1Contact Hydro International when larger pipe sizes are required.
2Contact Hydro International when custom sediment storage capacity is required.
3Minimum distance for models depends on pipe diameter.
First Defense® Operation and Maintenance ManualPage | 5
III. Maintenance
Overview
The First Defense® protects the environment by removing a wide range of pollutants from stormwater runoff. Periodic removal of
these captured pollutants is essential to the continuous, long-term functioning of the First Defense®. The First Defense® will capture
and retain sediment and oil until the sediment and oil storage volumes are full to capacity. When sediment and oil storage capacities
are reached, the First Defense® will no longer be able to store removed sediment and oil. Maximum pollutant storage capacities are
provided in Table 1.
The First Defense® allows for easy and safe inspection, monitoring and clean-out procedures. A commercially or municipally owned
sump-vac is used to remove captured sediment and floatables. Access ports are located in the top of the manhole.
Maintenance events may include Inspection, Oil & Floatables Removal, and Sediment Removal. Maintenance events do not require
entry into the First Defense®, nor do they require the internal components of the First Defense® to be removed. In the case of
inspection and floatables removal, a vactor truck is not required. However, a vactor truck is required if the maintenance event is to
include oil removal and/or sediment removal.
Maintenance Equipment Considerations
The internal components of the First Defense®-HC have a centrally located circular shaft through which the sediment storage sump
can be accessed with a sump vac hose. The open diameter of this access shaft is 15 inches in diameter (Fig.3). Therefore, the nozzle
fitting of any vactor hose used for maintenance should be less than 15 inches in diameter.
Determining Your Maintenance Schedule
The frequency of clean out is determined in the field after installation. During the first year of operation, the unit should be inspected
every six months to determine the rate of sediment and floatables accumulation. A simple probe such as a Sludge-Judge® can be
used to determine the level of accumulated solids stored in the sump. This information can be recorded in the maintenance log (see
page 9) to establish a routine maintenance schedule.
The vactor procedure, including both sediment and oil / flotables removal, for a 6-ft First Defense® typically takes less than 30 minutes
and removes a combined water/oil volume of about 765 gallons.
Fig.3 The central opening to the sump of the First Defense®-HC is 15 inches in diameter.
15-in Maintenance Access
First Defense® Operation and Maintenance Manual
Hydro International (Stormwater), 94 Hutchins Drive, Portland ME 04102
Tel: (207) 756-6200 Fax: (207) 756-6212 Web: www.hydro-int.com
Inspection Procedures
1. Set up any necessary safety equipment around the access
port or grate of the First Defense® as stipulated by
local ordinances. Safety equipment should notify passing
pedestrian and road traffic that work is being done.
2. Remove the grate or lid to the manhole.
3. Without entering the vessel, look down into the chamber to
inspect the inside. Make note of any irregularities. Fig.4
shows the standing water level that should be observed.
4. Without entering the vessel, use the pole with the skimmer net
to remove floatables and loose debris from the components
and water surface.
5. Using a sediment probe such as a Sludge Judge®, measure
the depth of sediment that has collected in the sump of the
vessel.
6. On the Maintenance Log (see page 9), record the date, unit
location, estimated volume of floatables and gross debris
removed, and the depth of sediment measured. Also note
any apparent irregularities such as damaged components or
blockages.
7. Securely replace the grate or lid.
8. Take down safety equipment.
9. Notify Hydro International of any irregularities noted during
inspection.
Floatables and Sediment Clean Out
Floatables clean out is typically done in conjunction with
sediment removal. A commercially or municipally owned sump-
vac is used to remove captured sediment and floatables (Fig.5).
Floatables and loose debris can also be netted with a skimmer
and pole. The access port located at the top of the manhole
provides unobstructed access for a vactor hose and skimmer
pole to be lowered to the base of the sump.
Scheduling
• Floatables and sump clean out are typically conducted once
a year during any season.
• Floatables and sump clean out should occur as soon as
possible following a spill in the contributing drainage area.
Recommended Equipment
• Safety Equipment (traffic cones, etc)
• Crow bar or other tool to remove grate or lid
• Pole with skimmer or net (if only floatables are being removed)
• Sediment probe (such as a Sludge Judge®)
• Vactor truck (flexible hose recommended)
• First Defense® Maintenance Log
Fig.4 Floatables are removed with a vactor hose (First Defense
model FD-4, shown).
Page | 6
First Defense® Operation and Maintenance Manual
Floatables and sediment Clean Out Procedures
1.Set up any necessary safety equipment around the access
port or grate of the First Defense® as stipulated by
local ordinances. Safety equipment should notify passing
pedestrian and road traffic that work is being done.
2.Remove the grate or lid to the manhole.
3.Without entering the vessel, look down into the chamber to
inspect the inside. Make note of any irregularities.
4.Remove oil and floatables stored on the surface of the water
with the vactor hose (Fig.5) or with the skimmer or net (not
pictured).
5.Using a sediment probe such as a Sludge Judge®, measure
the depth of sediment that has collected in the sump of the
vessel and record it in the Maintenance Log (page 9).
6.Once all floatables have been removed, drop the vactor hose
to the base of the sump. Vactor out the sediment and gross
debris off the sump floor (Fig.5).
7.Retract the vactor hose from the vessel.
8.On the Maintenance Log provided by Hydro International,
record the date, unit location, estimated volume of floatables
and gross debris removed, and the depth of sediment
measured. Also note any apparent irregularities such as
damaged components, blockages, or irregularly high or low
water levels.
9.Securely replace the grate or lid.
- Regularly during first year of installation
- Every 6 months after the first year of installation
- Once per year, with sediment removal
- Following a spill in the drainage area
- Once per year or as needed
- Following a spill in the drainage area
Activity FrequencyInspection
Oil and Floatables
Removal
Sediment Removal
Maintenance at a Glance
NOTE: For most clean outs the entire volume of liquid does not need to be removed from the manhole. Only remove the
first few inches of oils and floatables from the water surface to reduce the total volume of liquid removed during a clean out.
Fig.5 Sediment is removed with a vactor hose (First Defense
model FD-4, shown).
Page | 7
First Defense® Installation Log
HYDRO INTERNATIONAL REFERENCE NUMBER:
SITE NAME:
SITE LOCATION:
OWNER: CONTRACTOR:
CONTACT NAME: CONTACT NAME:
COMPANY NAME: COMPANY NAME:
ADDRESS: ADDRESS:
TELEPHONE: TELEPHONE:
FAX: FAX:
INSTALLATION D ATE: / /
MODEL SIZE (CIRCLE ONE): FD-4 FD-4HC FD-6 FD-6HC
INLET (CIRCLE ALL THAT APPLY): GRATED INLET (CATCH BASIN) INLET PIPE (FLOW THROUGH)
Hydro International (Stormwater), 94 Hutchins Drive, Portland ME 04102
Tel: (207) 756-6200 Fax: (207) 756-6212 Web: www.hydro-int.com
First Defense® Inspection and Maintenance Log
Initials Depth of
Floatables
and Oils
Sediment
Depth
Measured
Volume of
Sediment
Removed
Site Activity and
Comments
Date
HydroInternational (Stormwater), 94 Hutchins Drive, Portland ME 04102
Tel: (207) 756-6200 Fax: (207) 756-6212 Web: www.hydro-int.com Hydro International (Stormwater), 94 Hutchins Drive, Portland ME 04102
Tel: (207) 756-6200 Fax: (207) 756-6212 Web: www.hydro-int.com
Turning Water Around...®
Stormwater Solutions
94 Hutchins Drive
Portland, ME 04102
Tel: (207) 756-6200
Fax: (207) 756-6212
stormwaterinquiry@hydro-int.com
www.hydro-int.com
Do it Right the First Time
Learn more at hydro-int.com/service
CALL 1 (888) 382-7808 TO SCHEDULE AN INSPECTION
Site Name:
Owner Name:
Owner Address:
Owner Phone Number:
Emergency Phone Number:
Location:
Date:
Time:
Inspector:
Change in ownership since
last inspection?
Maintenance Item Maintenance (1 or 2)* Maintenance is needed: Comments
Trash or debris which is located immediately in
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).
Sediment Sediment (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
or cracks wider than 1/4 inch (Intent is to make
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
unsound.
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.
Settlement/Misalignment If failure of basin has created a safety, function,
or design problem.
Vegetation 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 Pollution Any evidence of oil, gasoline, contaminants or
other pollutants (Coordinate removal/cleanup
with local water quality response agency).
Cover 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.
One maintenance person cannot remove lid after
applying normal lifting pressure (Intent is to
keep cover from sealing off access to
maintenance).
Ladder Ladder is unsafe due to missing rungs, not
securely attached to basin wall, misalignment,
rust, cracks, or sharp edges.
Metal Grates Trash and debris that is blocking more than
20% of grate surface inletting capacity.
*Maintenance: Enter 1 if maintenance is need and include WO#. Enter 2 if maintenance was performed same day
Trash & Debris
Y OR N
Vegetation
Catch Basin Cover
Fractures or Cracks in Basin
Walls/Bottom
Structure Damage to Frame and/or
Top Slab
Inspection and Maintenance Checklist
Catch Basins, Manholes, and Inlets