HomeMy WebLinkAboutO&M Manual
Post-Construction Stormwater Quality
BMP
Operations and Maintenance Manual
For:
Carmel Office Building
1701 E. 116th Street
Carmel, IN 46032
Prepared For:
S-Mart Real Estate, Inc.
8925 Prairie Trail
Avon, IN 46123
Phone: (317) 694-6500
Contact: Warren Johnson
Date: October 18, 2022
Revised: February 24, 2023
March 14, 2023
April 18, 2023
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. – Steven Rucker
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Operation and Maintenance Manual
Carmel Office Building
Carmel, Indiana
Project #W220335
TABLE OF CONTENTS
Operation and Maintenance Manual
1. Project Narrative
2. Definitions
3. Owner Acknowledgement
4. Location Maps and Referenced Construction Documents
5. Checklists and Maintenance Activities
Mechanical Water Quality Unit
Underground Storage System
Inlet Filter Insert
6. Reference Materials
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Prepared For:
Operation and Maintenance Manual
Carmel Office Building
Carmel, Indiana
Project #W220335
Project Narrative
S-Mart Real Estate, Inc. is proposing to construct a new office Building on approximately
2.56 acres, located at 1701 E. 116th Street, Carmel, IN 46032, Indiana. Currently the site
is being used as a staging area for the construction of a round-about at the intersection of
116th Street and Rangeline Road. Prior to being used as a staging area, the site was a gas
station with existing structures, pavement, storm sewers, and utility lines.
The proposed construction is on a site at a Latitude of 39° 07’ 23” N and Longitude of
86° 07’ 34” W, falling within Clay Township. The site is part of the Norththwest Quarter
of Section 06, Township 17 North, Range 4 East, Hamilton County, Indiana. Please refer
to Figure 1.1 for a project location map and Figure 1.3 for a site aerial.
Floodzone:
Based upon a scaled interpretation of the Federal Emergency Management Agency
(FEMA), Flood Insurance Rate Map, Map No. 18057C0209G for Hamilton County,
Indiana, effective date November 19, 2014, the subject tract (commercial development) is
located within Zone X. Zone X refers to minimal risk areas outside the 1-percent and 0.2
percent-annual-chance floodplains. The nearest flood system is Carmel Creek located
inside the south boundary of the project site. Please refer to the National Flood Hazard
Layer FIRMette attached.
The proposed project will utilize a series of BMP’s, creating a treatment train to achieve
the minimum 80% TSS removal. Aqua Guardian inlet inserts will be installed in each
catch basin as the first BMP in the treatment train. The captured runoff will then be
directed through a Hydro International First Defense 4-ft before entering the underground
detention system.
Refer to Figure 3 for the location of the inlet filter inserts, hydrodynamic separator, and the
outlet control structure for the underground detention system.
BMP Owner Contact Information:
S-Mart Real Estate, Inc.
8925 Prairie Trail
Avon, IN 46123
Phone: (317) 694-6500
Contact: Warren Johnson
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Definitions
Best Management Practice (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:
The mechanical water 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 WQU provides treatment for 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.
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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.
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Underground Detention:
The StormTrap 6’-6” SingleTrap chamber, open-bottom reinforced concrete chamber
system provides storage needed to meet stormwater runoff reduction requirements while
maximizing available land space due to being below grade. Structurally designed for
traffic loading, the chamber system can be under both green space and pavement areas.
Inspection recommendations are detailed in the attached StormTrap Inspection and
Maintenance Guide.
Inlet Filter Insert:
A post-construction flow-through water quality device designed to remove sediment,
trash & debris, heavy metals bound to particulate matter and oil. The filter works to
remove pollutants; such as perlite, granular activated carbon (GAC), leaf compost,
zeolite, and various media blends; while simultaneously providing a high level of
filtration treatment of stormwater runoff or industrial water discharges. Implementing a
consistent maintenance program will result in long term operational and performance
efficiency for the Aqua-Guardian™ insert. Inspection recommendations are detailed in
the attached Hydro International First Defense Inspection and Maintenance Guide.
Compensatory Storage Area:
A Compensatory Storage Area is a space providing volume that offsets or compensates
for fill placed in the flood plain. It is typically a low area of a development adjacent to the
flood plain that allows flood water to be stored and drain out in a natural way without
endangering structures or roadways. Visual inspections should be made on a routine
basis. Trash, brush, and other debris should be removed regularly. Visible erosion and
scour along water flow line, riprap areas, and adjacent to end sections should be re-
dressed. Displaced riprap should be restored to its original condition, and if necessary,
new riprap should be installed.
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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. 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.
BMP Inspection Schedule
1. All BMPs will be inspected annually by the owner at a minimum.
2. The Underground Detention System will be inspected by the owner per the
Operation, Maintenance, and Management Inspection Checklists.
3. Storm structures will be inspected by the owner quarterly and after every major
rainfall event.
4. SQUs will be inspected annually by the owner per provided guidelines and after
every major rainfall event.
5. SQUs will be inspected and cleaned immediately if there is a gasoline or oil spill.
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 BMP owner must maintain and
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update the BMP operations and maintenance plan as conditions change. At a minimum,
the operations and maintenance plan must include, but is not limited to:
1. Visual inspect and removal of debris from storm sewers and structures
2. Removal of woody vegetation from swales and other drainageways
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. Storm sewer should be kept clear of
sediments and debris. The natural areas near inlets and outlets associated with the storm
sewer system should be repaired when needed to avoid introducing soil and sediment to
this system or downstream systems.
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. 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 rainfall.
Inspection during construction should be after a storm event and at a minimum, one (1)
time a week. Inspections during the post-construction operation and maintenance period
must include routine inspection of all storm water infrastructure to verify that all
components are functioning as designed and are not in danger of failing. The stormwater
system shall be inspected on an annual basis or upon observed failure.
Note that entry into the SQUs should be considered confined space and inspection
and maintenance activities should be performed in compliance with OSHA
guidelines, see Section 6 of the O&M manual.
Note also that all sediments and oil absorbent material shall be disposed of in
accordance with all federal requirements and NOT dumped into the storm or
sanitary sewer systems.
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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 to 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: Hydro International First Defense 4-ft_____________________
Aqua-Swirl Aqua Guardian Inlet Inserts (x3)________________
Storm Trap SingleTrap Detention System__________________
_______________________________ _______________________________
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
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FIGURE 1
WEIHE weihe.net
Indianapolis, Indiana 46280
10505 N. College Avenue
317 | 846 - 6611E N G I N E E R S
W
S
N
E
LOCATION MAP
Date: October 18, 2022
CARMEL OFFICE
BUILDING PROJECT LOCATION
116TH ST
106TH ST
465
96TH STREETCOLLEGE AVERANGELINE RDKEYSTONE AVESR-31/MERIDIAN STMAIN ST
126TH ST
10 of 40
FIGURE 2
WEIHE weihe.net
Indianapolis, Indiana 46280
10505 N. College Avenue
317 | 846 - 6611E N G I N E E R S
W
S
N
E
SITE AERIAL
Date: October 18, 2022
CARMEL OFFICE
BUILDING PROJECT LOCATION
116TH ST
RANGELINE RD11 of 40
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ATM
TUBE
TUBE
E. 116th STREET
WESTFIELD BLVD100
101
203
201
200
202
204
FIGURE 3.1
WEIHE weihe.net
Indianapolis, Indiana 46280
10505 N. College Avenue
317 | 846 - 6611E N G I N E E R S
W
S
N
E
PROPOSED BMP
LOCATION
Date: April 18, 2023
CARMEL OFFICE
BUILDING
OUTLET CONTROL
STRUCTURE
UNDERGROUND
DETENTION
HYDRO INTERNATIONAL
FIRST DEFENSE 4-FT
AG-18 AQUA-GUARDIAN
CATCH BASIN INSERT
AG-18 AQUA-GUARDIAN
CATCH BASIN INSERT
AG-18 AQUA-GUARDIAN
CATCH BASIN INSERT
AG-18 AQUA-GUARDIAN
CATCH BASIN INSERT
CHECK VALVE ON
OUTFALL PIPE
COMPENSATORY
STORAGE AREA
FIGURE 3.2
WEIHE weihe.net
Indianapolis, Indiana 46280
10505 N. College Avenue
317 | 846 - 6611E N G I N E E R S March 14, 2023
CARMEL OFFICE BUILDING
OUTLET CONTROL STRUCTURE "101"
NO SCALE
BB
SECTION A-A SECTION B-B
A
A
PLAN VIEW
DETAIL
13 of 40
FIGURE 3.3
WEIHE weihe.net
Indianapolis, Indiana 46280
10505 N. College Avenue
317 | 846 - 6611E N G I N E E R S
WATER QUALITY & DIVERSION STRUCTURE DETAIL
OUTLET INVERT FROM STR 201 TO DETENTION
CHAMBERS HAS BEEN RAISED FROM ANALYSIS
COMPUTATIONS TO ACT AS A WEIR, ENSURING
PRIMARY FLOW IS DIRECTED TO BMP.
STR 201
48" DIA MANHOLE
INLET STRUCTURE
TOC = 817.15
STR 200
HYDRO INTERNATIONAL
FIRST DEFENSE 4-FT
TOC = 817.40
STORM TRAP CHAMBERS
INV = 812.30
INV = 812.40
INV = 812.61
INV = 812.15
INV = 812.15
INV = 812.10
INV = 812.20
INV = 812.10
12" PIPE FROM
STR 203
12" PIPE FROM
STR 202
15" PIPE
12" PIPE
12" PIPE
CARMEL OFFICE BUILDING DETAIL
NO SCALE
March 14, 2023
14 of 40
Elevation View
SCALE 1:12
Plan View
SCALE 1:12
Projected View
SCALE 1:40
Mounting Rails
SCALE 1:12
QTY - 4
DETAIL A
SCALE 1:6
"T" Handle Center Piece Detail
SCALE 1:12
A
2733 Kanasita Drive, Suite 111, Chattanooga, TN 37343
Phone (888) 344-9044 Fax (423) 826-2112
www.aquashieldinc.com
Structure #:
Drawn By:
Scale:
Date:
OFlores
5/5/2020
Rvwed Rvw. Date
U.S. Patent Pending
Aqua-Guardian
Standard Detail
As Shown
Rev Date Description of RevisionAqua-Guardian Catch Basin Insert
GENERAL NOTES:
1. Insert shall be constructed from High-Density Polyethlene (HDPE)
PE 3408 ASTM F714 and stainless/powder coated steel.
2. HDPE support flange can be field cut by contractor to fit.
3. Prior to fabrication, purchaser is responsible for indicating all
obstructions in catch basin which might inhibit proper installation.
4. Optimum installation requires that the bottom of the insert be
above or level with the crown of discharge pipe elevation (1/2
discharge pipe minimum).
SIGNED APPROVED DRAWING REQUIRED BEFORE
START OF MANUFACTURING DATE:________
( ) APPROVED _____________________________
( ) APPROVED AS NOTED ____________________
( ) REVISE & RESUBMIT _____________________
AG-18 STD
AG-18
24"
24"
Contractor to Drill 3/8"
holes in HDPE Support
Flange to match Mounting Rails
Stainless Steel Mounting Ralls
to be installed by contractor
using stainless steel bolts, fender
washers/flat bar and lock nuts
(provided by manufacturer).
Filter Housing
Locking
Centerpiece
Filter Screen
Outlet Flow Filtered
Standpipe
Perforated
Base PlateFilter Media
Sediment Collection
Chamber
HDPE Support Flange
can be field cut by
contractor to fit.
Internal High Flow
Bypass
"T" Handle
21 1/2"
1"
HDPE Support Flange
(can be field cut
by contractor to fit)
24 1/2"
24"
2"
1"14"2"
2"5 3/4"7/8"1"
HDPE Suppot
Flange
Fender Washer
or Flat Bar
Lock Nut
Washer
5/16" BoltMounting Rail
P13 1/4"
15 of 40
PLAN VIEW
SECTION A-A
PARTS LIST
DESCRIPTIONSIZE (mm)SIZE (in)QTYITEM
I.D. PRECAST MANHOLE12004811
INTERNAL COMPONENTS
(PRE-INSTALLED)
12
FRAME AND COVER (ROUND)7503013
OUTLET PIPE (BY OTHERS)600 (MAX)24 (MAX)14
INLET PIPE (BY OTHERS)600 (MAX)24 (MAX)15
A A
WEIGHT:
SHEET SIZE:
B
SHEET :
1 OF 1
DRAWING NO.:
FD GA-4
STOCK NUMBER:
hydro-int.com
HYDRO INTERNATIONAL
Rev:
-
Title
4-ft DIAMETER
FIRST DEFENSE
DRAWN BY:
ER
CHECKED BY:
MRJ
APPROVED BY
DATE:
11/2/2021
SCALE:
1:30
PROJECTION
MATERIAL:
GENERAL ARRANGEMENT
IF IN DOUBT ASK
5
1. MANHOLE WALL AND SLAB
THICKNESSES ARE NOT TO
SCALE.
2. CONTACT HYDRO
INTERNATIONAL FOR A BOTTOM
OF STRUCTURE ELEVATION
PRIOR TO SETTING FIRST
DEFENSE MANHOLE.
3. CONTRACTOR TO CONFIRM
RIM, PIPE INVERTS, PIPE DIA.
AND PIPE ORIENTATION PRIOR
TO RELEASE OF UNIT TO
FABRICATION.
PRODUCT SPECIFICATION:
1. Peak Hydraulic Flow: 18.0 cfs (510 l/s)
2. Min Sediment Storage Capacity: 0.7 cu. yd. (0.5 cu. m.)
3. Maximum Inlet/Outlet Pipe Diameters: 24 in. (600 mm)
4. The Treatment System Shall Use An Induced Vortex To Separate Pollutants From Stormwater Runoff.
5. For More Product Information Including Regulatory Acceptances, Please Visit
https://hydro-int.com/en/products/first-defense
GENERAL NOTES:
1. General Arrangement drawings only. Contact Hydro International for site specific drawings.
2. The diameter of the inlet and outlet pipes may be no more than 24".
3. Multiple inlet pipes possible (refer to project plan).
4. Inlet/outlet pipe angle can vary to align with drainage network (refer to project plans).
5. Peak flow rate and minimum height limited by available cover and pipe diameter.
6. Larger sediment storage capacity may be provided with a deeper sump depth.
4
1
1
3 2 4
2
4.97 ft [1.515 m]PIPE ELEV: (MINIMUM)
8.07 ft [2.460 m]T.O.S ELEV.: (MINIMUM)
RIM: VARIES
.00 ft [.000 m]SUMP ELEV:
5
HYDRO FRAME AND
COVER (INCLUDED)
GRADE RINGS BY OTHERS
AS REQUIRED
NOTE: ADDITIONAL HEIGHT MAY BE
REQUIRED DEPENDING ON PIPE SIZE
2.25 ft [.685 m]BOTTOM OF INTERNALS:
3.47 ft [1.057 m]PREASSEMBLY REFERENCE:
16 of 40
Operation and Maintenance Manual
First Defense® High Capacity and First Defense®Optimum
Vortex Separator for Stormwater Treatment
17 of 40
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
18 of 40
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®.
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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
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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
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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
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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
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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
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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
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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
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First Defense® Operation and Maintenance ManualNotes
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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
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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.
Inspection and Maintenance Checklist
Catch Basins, Manholes, and Inlets
Vegetation
Catch Basin Cover
Fractures or Cracks in Basin
Walls/Bottom
Structure Damage to Frame and/or
Top Slab
Trash & Debris
Y OR N
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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
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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
Clogged Outlet Debris and/or sediment obstructing flow into the outlet
pipe
Standing water
System does not drain to gravel base in dry conditions
Potholes / sinkholes Surface evidence of potholes or sinkholes in the
vacinity of the detention system
Sedimentation Unusual ammount of sediment or silt noticable from
inspection port
*Maintenance: Enter 1 if maintenance is need and include WO#. Enter 2 if maintenance was performed same day.
Inspection and Maintenance Checklist
Underground Detention
Y OR N
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