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10505 N. College Ave | 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
THE RESERVE AT SPRINGMILL
Springmill Road
Carmel, Indiana
Project #W21-0497
Prepared for:
Pittman Partners
PO Box 554
Carmel, IN 46082
Contact: Steve Pittman
Telephone (317) 590-5074
E-mail: steve@pittmanpartners.com
Prepared By: Travis P. Gaither, P.E.
Checked By: Duane A. Sharrer, P.E.
Date:
January 12, 2022
Revised:
May 13, 2022
August 4, 2022
I AFFIRM, UNDER THE PENALTIES FOR PERJURY, THAT I HAVE TAKEN REASONABLE CARE TO
REDACT EACH SOCIAL SECURITY NUMBER IN THIS DOCUMENT, UNLESS REQUIRED BY LAW. –
Travis P. Gaither
THIS INSTRUMENT PREPARED BY: Travis P. Gaither
Operation and Maintenance Manual
Prepared For:
The Reserve at Springmill
Carmel, Indiana
Project #W21-0497
TABLE OF CONTENTS
Operation and Maintenance Manual
1. Project Narrative
2. Definitions
3. Owner Acknowledgement
4. Location Maps
5. Checklists and Maintenance Activities
Stormwater Quality Mechanical Unit
Stormwater Infrastructure
Wet Detention Basin
PROJECT NARRATIVE
Operation and Maintenance Manual
Prepared For:
The Reserve at Springmill
Carmel, Indiana
Project #W21-0497
Project Narrative
Pittman Partners is proposing to revise existing lots 69 and 70 of the overall residential subdivision
known as “The Reserve at Springmill”. Lots 69 and 70 combine to cover 2.7 acres of land. Said
overall development is located on the east side of Springmill Road between Illinois Street and 106th
Street. The revisions to the lots are located on the east end of Sanner Court. Refer to Figure 1.1.
The proposed development is on a site at a Latitude of N 39° 56' 21" and Longitude W 86° 09' 45",
falling within Clay Township. The site is generally located in the Northwest Quarter of Section 11,
Township 17 North, and Range 3 East, in Hamilton County, Indiana.
The stormwater runoff will be routed to one (1) stormwater quality mechanical unit (Hydro
International First Defense High Capacity – 4 ft) and (1) existing Wet Detention Basin to meet the
Water Quality Requirements described in Chapter 700 of the Stormwater Manual.
This O&M manual is for the inspection and maintenance of the stormwater quality mechanical unit,
stormwater infrastructure, and wet detention basin associated with The Reserve at Springmill.
Refer to Figure 2.
Site Information
Deed of Record:
Refer to Recorded Plat for The Reserve at Springmill
Owner:
Pittman Partners
PO Box 554
Carmel, IN 46082
BMP Owner Contact Information:
The Reserve at Springmill Homeowners Association
PO Box 554
Carmel, IN 46082
Telephone (317) 590-5074
Contact: Steve Pittman
Email: steve@pittmanpartners.com
DEFINITIONS
Definitions
BMP:
Best Management Practices refer to structural or non-structural measures designed for the
benefit of water quality and quantity.
BMP Owner:
The owner of the BMPs is typically the Homeowner Association. 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.
Stormwater Quality Mechanical Unit:
The mechanical stormwater quality unit provides a highly effective means for the removal
of sediment, floating debris and free-oil. Swirl technology, or vortex separation, is a proven
form of treatment utilized in the stormwater industry to accelerate gravitational separation.
The BMP/WQU provides treatment for the most contaminated first flush, while the cleaner
peak storm flow is diverted and channeled through the main conveyance pipe. A
combination of gravitational and hydrodynamic drag forces encourages the solids to drop
out of the flow and migrate to the center of the chamber where velocities are the lowest.
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 dry pond, 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.
Best Management Practice (BMP)
Urban stormwater runoff contains many types and forms of pollutants. When compared to
stormwater run-off from pre-developed conditions, high concentrations of 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.
Best management practices (BMPs), both structural and non-structural, can reduce the amount of
pollutants in stormwater.
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, ditches, channels, ponds and
other treatment 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 should be
inspected at least once every six months. Some storm water treatment devices, such as oil/water
separators, may require more frequent inspection. For these, check the manufacturer’s specification
or other design guidance handbooks. Sewer pipes and culverts should be inspected every three to
five years, or in response to a reported problem. Most agencies inspect their sewer pipes six inches
or larger with a TV camera, and pipes 36 inches or larger with a walk-through inspection. 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.
INSPECTION
Inspections
The first inspection shall be performed immediately after construction is completed. If there are
any deficiencies are found during the inspection, these should be addressed in a timely manner.
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.
Construction Completion Type of Inspection Inspection Due Date Subsequent Due Dates
Date: Storm Structures
1 year after construction
completion date
After every rain event
>1 inch over a 24 hour
period
Annually, within same month as
initial report
Date: Stormwater Quality Mechanical
Unit
1 year after construction
completion date
After every rain event
>1 inch over a 24 hour
period
Annually, within same month as
initial report
Date: Wet Detention Basin 1 year after construction
completion date
After every rain event
>1 inch over a 24 hour
period
Annually, within same month as
initial report
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:
City of Carmel
Carmel Engineering Department Storm Water
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 developer/owner is responsible for the cost of maintenance. 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. Visual inspection and removal of debris from all storm structures including the sumped
structures and Snout Guards.
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.
OWNER ACKNOWLEDGEMENT
Owner Acknowledgement Agreement (“Agreement”)
For good and valuable consideration, the receipt and sufficiency of which are hereby
acknowledged, the undersigned owner (“Owner”) hereby submits this Operation and Maintenance
Manual (“Manual”) to the City of Carmel, Indiana (“City”) as a written acknowledgement of
Owner’s warranty and agreement to institute, maintain, and follow the water quality Best
Management Practices (“BMPs”) listed below, and to follow and abide by the inspection schedule
and maintenance activities listed in this Manual. The Owner also hereby agrees to provide, at
Owner’s cost, all additional maintenance, repair, and/or replacement services reasonably necessary
to maintain the function and longevity of the BMPs from and including the date this Agreement is
executed by Owner and including the date on which a new Agreement is filed with the City by
another party who assumes all of the obligations and responsibilities of Owner as set forth herein.
BMPs: Stormwater Quality Mechanical Unit-Hydro International First Defense High Capacity 4 ft
Stormwater Infrastructure
Wet Detention Basin
__________________________________ ____________
Owner Signature Date
___________________________________________ ___________________________________________
Printed Name Company
STATE OF INDIANA )
) SS:
COUNTY OF HAMILTON )
BEFORE ME, the undersigned, a Notary Public in and for said County and State,
personally appeared _____________________________________, Owner, subscribed and
sworn before this _____ day of __________________, ______.
___________________________ ___________________________________
County of Residence Signature
___________________________ ___________________________________
Commission Expiration Date Printed Name
LOCATION MAPS
LOCATION MAP
Date: October 20, 2021FIGURE 1.1
WEIHE weihe.net
Indianapolis, Indiana 46280
10505 N. College Avenue
317 | 846 - 6611E N G I N E E R S
PROJECT LOCATION
RESERVE AT SPRINGMILL
CARMEL, IN
80 79 78
77
7675
71
68
SANNER COURT
(PRIVATE STREET)
FIGURE 2
WEIHE weihe.net
Indianapolis, Indiana 46280
10505 N. College Avenue
317 | 846 - 6611E N G I N E E R S
RESERVE AT SPRINGMILL
CARMEL, IN
WATER QUALITY
LOCATION EXHIBIT
Date: August 4, 2022HYDRO INTERNATIONALFIRST DEFENSE HIGHCAPACITY - 4 ftCONNECTION TO
EXISTING STORM
SEWER NETWORK
FIGURE 3
WEIHE weihe.net
Indianapolis, Indiana 46280
10505 N. College Avenue
317 | 846 - 6611E N G I N E E R S
RESERVE AT SPRINGMILL
CARMEL, IN
WATER QUALITY
LOCATION EXHIBIT
Date: May 13, 2022
WET DETENTION BASIN
CHECKLISTS AND MAINTENANCE
ACTIVITIES
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 Basin Structure
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
Operation and Maintenance Manual
First Defense® High Capacity and First Defense®Optimum
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
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 to accommodate a wide range of pipe sizes,
peak flows and depth constraints.
The two product models described in this guide are the First
Defense® High Capacity and the First Defense® Optimum;
they are inspected and maintained identically.
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
• 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
7
II. Model Sizes & Configurations
The First Defense® inlet and internal bypass arrangements are available in several model sizes and configurations. The components
have modified geometries allowing greater design flexibility 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
12
3
4
5
6
7
8
(not pictured)
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.2). First Defense® model sizes (diameter) are shown in Table 1.
III. Maintenance
7. Sediment Storage
8. Inlet Grate or Cover
First Defense®
Model Sizes
(ft / m) diameter
3 / 0.9
4 / 1.2
5 / 1.5
6 / 1.8
7 / 2.1
8 / 2.4
10 / 3.0
Fig. 2
Table 1
First Defense® Operation and Maintenance ManualPage | 5
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.
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® 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 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®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.4).
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 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
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 or with the skimmer or net
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
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.
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 DATE: / /
MODEL SIZE (CIRCLE ONE): [3-FT] [4-FT] [5-FT] [6-FT] [7-FT] [8-FT] [10-FT]
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
Hydro International (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
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
NOTES
First Defense® Operation and Maintenance ManualNotes
Stormwater Solutions
94 Hutchins Drive
Portland, ME 04102
Tel: (207) 756-6200
Fax: (207) 756-6212
stormwaterinquiry@hydro-int.com
www.hydro-int.com
Turning Water Around...®
FD_O+M_K_2105
PLAN VIEW
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 HISTORYREV BYDESCRIPTION DATE-FIRST RELEASE
5
1. MANHOLE WALL AND SLAB
THICKNESSES ARE NOT TO
SCALE.
2. CONTRACTOR TO CONFIRM
RIM, PIPE INVERTS, PIPE DIA.
AND PIPE ORIENTATION PRIOR
TO RELEASE OF UNIT TO
FABRICATION.
PRODUCT SPECIFICATION:
1.PEAK HYDRAULIC FLOW:
2.MIN SEDIMENT STORAGE CAPACITY:
3.OIL STORAGE CAPACITY:
4.MAXIMUM INLET/OUTLET PIPE DIAMETERS: 18 in. (450 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 plan.)
3.Peak flow rate and minimum height limited by available cover and pipe diameter.
4
1
1
3
4
Pipe DetailsPIPE MATERIAL LENGTH INV IN INV OUT SLOPEOUTLETft%INLET 1 ft %INLET 2 ft %INLET 3 ft %INLET 4 ft %.00 ft [.000 m]BOTTOM OF INTERNALS:.00 ft [.000 m]PREASSEMBLY REFERENCE:
2
5
HYDRO FRAME AND
COVER (INCLUDED)
GRADE RINGS BY OTHERS
AS REQUIRED
2
NOTE: ADDITIONAL HEIGHT MAYBE
REQUIRED DEPENDING ON PIPE SIZE
Site:
Structure No:
15 cfs 0.4 yd3125 gal
RIM: 843.86 FT
OUTLET 839 FT
SUMP: 835.29 FT
44.5"
30
18
18
5/12/2022joe.rogers@ads-pipe.com
(in)
36
102.82"
3 FT FIRST DEFENSE®
HIGH CAPACITY
Reserve at Spring Mill
495