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Please note the following requirements to
assure proper construction:
• Contact local underground utility companies to
locate all utilities prior to construction.
• Check all chambers for shipping damage before
installation. Units that have been damaged
should not be installed. Contact Infiltrator Water
Technologies immediately upon discovery of any
damage.
• For a large bed that cannot be filled from the
sides, Infiltrator Water Technologies recommends
using a lightweight tracked vehicle (ground
pressure of tracks must not exceed 10 psi for 6” to
12” of cover. For examples of acceptable vehicles,
maximum wheel loads and maximum ground
pressure, please contact our Technical Assistance
department.
• ISI’s requirements for systems with a pavement
design (asphalt, concrete pavers, etc.): minimum
cover is 18” excluding pavement; maximum cover
is 96” including pavement. NOTE: Only the High
Capacity H-20 chamber is permitted for use in
traffic applications.
• A minimum of 6 inches of gravel must be
maintained beneath the tracks at all times.
• Washed, crushed stone must be between 1-1/2”
to 2” in size. Rounded or recycled stone is not
acceptable.
• A well-graded granular soil must be used for
backfill to maximum load carrying capacity.
• Sandy soils have special requirements.
• For gravity distribution, a distribution pipe is not
BEFORE YOU BEGIN
It is important to note that the High Capacity
H-20 chamber is the only Infiltrator chamber
warranted to be installed in traffic applications.
When installed using the following installation
instructions, the chambers can sustain vehicle
loads of up to 32,000 lbs (H-20) per axle.
Like non-traffic bed systems, the soil and site
conditions must be approved prior to installation.
Be sure that a thorough site evaluation is conducted
to determine the proper size and location of the
system before proceeding with the installation.
NOTE: The onsite system area is not to be used
as a staging area for construction equipment or
materials before or after construction of the
system. Temporary fencing, warning tape, and
appropriately located signs are commonly used
to prevent unauthorized traffic from damaging
sensitive soils.
NOTE: Due to the installation of stone on the
bottom of the bed, system sizing in parking
applications must not include any reduction
in the absorption area.
EXCAVATING AND PREPARING THE SITE
NOTE: Do not install system in wet conditions or
in overly moist soils, as this causes machinery to
smear the soil.
1. Locate all underground utilities.
2. Stake out the location of the bed and set the
elevation of the tank, pump chamber (if required),
H-20 Chambers
It is important to note that the High Capacity H-20 chamber is the only Infiltrator chamber warranted to be installed in traffic applications. When installed using the following
installation instructions, the chambers can sustain vehicle loads of up to 32,000 lbs
(H-20) per axle.
pre-treatment devices (if required), piping, and bed
bottom. Install sedimentation and erosion control
barriers as necessary.
3. Excavate and level the designated area.
4. Rake the bottom and sides if smearing has
occurred while excavating. Verify the bottom of
the bed is level using a transit, laser or level.
5. Prepare the chamber bed’s sub grade soil as
outlined in the designer’s plans.
6. Place a minimum 3-inch layer of 1-1/2 to 2-inch
washed, crushed stone over the entire bottom
surface of the bed.
7. Compact the stone using at least two perpendicular passes of the vibratory roller with full
dynamic force applied to achieve a flat surface.
(Maximum gross vehicle weight of 12,000 lbs and a
maximum dynamic force of 20,000 lbs).
S
1. If a specified fill material is required, the fill
should be placed in lifts not exceeding 6 to 12
inches. The compaction of the fill should meet a
minimum density equivalent to 95 percent of the
soils Maximum Standard Proctor Density Value
(ASTM-D698).
2. The fill material, as a minimum, should meet
state and local criteria. However, sands with less
than 5% passing the U.S. #200 sieve are usually
acceptable provided their saturated hydraulic
conductivity (after compaction) is greater than
5 feet per day.
3. Compact the fill using a large piece of
machinery, (example: backhoe or bulldozer) or a
vibratory roller with its full dynamic force applied
to achieve a flat surface. (Maximum gross vehicle
16"
PECIFIED FILL MATERIAL
H-20 High Traffic
Installation Instructions
75"
EFFECTIVE LENGTH
34"
weight of 12,000 lbs and a maximum dynamic
force of 20,000 lbs.)
4. After the fill has been placed and compacted,
verify the bottom of the bed is level using a transit,
laser or level.
PREPARING THE POSILOCK END PLATES
1. With a hole saw, cut an opening for the inlet
pipe using one of the pre-marked circles on the
end plate as a guide. Pre-marked circles allow for
4-inch corrugated, 4-inch SDR 35, 4-inch SCH 40
and 3-inch and 2-inch pressure dosing pipe.
NOTE: Pipe size may vary according to state/
county regulations or designer specifications.
2. Attach end plate to the inlet end of the
chamber by lining up the locking hubs wit the
corresponding chamber end. Apply firm pressure
to lock the hubs in place on one side of the
chamber and then the other.
NOTE: The end plate is clearly marked ‘Inlet Side
Toward Chamber’ to ensure proper installation.
3. At the inlet end of the end plate, insert the
appropriate diameter pipe into the previously
drilled hole. Fasten the pipe in place with a 2-inch
screw to secure it to the end plate. (End plates are
required only at the beginning and end of each
row of chambers. They are reversible to fit either
end of the chamber.)
NOTE: The end plate is designed so effluent will
flow in through the pipe corresponding inlet hole
and spill out of the opening on the other side.
When inserting the inlet pipe. it will only extend
into the end plate one inch before reaching a stop.
Contact Infiltrator Water Technologies Inc. 1-800-221-4436 for additional technical and product information.
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INSTALLING THE SYSTEM
1. Install piping per plan. A d-box or manifold may
be installed if allowed/required by law.
NOTE: For pressurized systems, it may be
easier to install the piping before constructing
the chamber bed.
2. Check the header pipe to be sure it is level or
has the prescribed slope.
3. Set the invert elevation at the appropriate height
by measuring from the bottom of the bed to the
bottom of the inlet. Invert height will vary depending on which chamber model is used. PRecisely
measure the invert height on the end plate prior to
setting the invert elevation.
NOTE: Scour controls, such as splash pads, may
be required by state/county regulations or by the
designer if inlet flows exceed specified volume.
Locate and install scour control measures if
required per site plan.
4. Construct the chamber bed by joining chambers
9. Determine that the chamber rows are parallel
following the steps above. Keep the required
istance between each row of chambers.
NOTE: Separation distance between chamber
rows varies per code. If possible, Infiltrator Water
Technologies recommends 6 inches of separation.
10. The last chamber in the row requires an end
plate. Attached a closed end plate onto the outlet
end of the chamber. Do not cut an opening in the
closed or outlet end plate. The existing opening on
the end plate must face outward when installed on
the closed or outlet end of the chamber. Repeat
this step for each row in the bed.
NOTE: Lopping the outlet end of the bed may
be required by state/local code or specified by
design. Infiltrator recommends drilling a hole in the
end plate at the specified invert height.
11. Insert the loop manifold through the end plate
and determine that the manifold is level before
backfilling the system.
length-wise in rows (if possible, be sure chamber
placement does not exceed the reach of the
construction equipment used to place fill).
5. To connect the chambers, lift and place the
end of the next chamber onto the previous one
at a 45° angle. Line up the notches on the center
end of the chamber and lower it to the ground to
engage the interlocks.
6. Continue connecting the chambers until the
first row is completed.
7. Check the first row of chambers to be sure that
it is level.
8. Continue connecting chambers until the bed
is complete. As the chambers are installed, verify
that they are level.
COVERING THE SYSTEM
1. To ensure structural stability, carefully anchor
chambers by ladling approved gravel between the
chamber rows making sure not to dislodge the
units. Be sure the gravel extends above the
louvers a minimum of 2 inches.
2. Place 6 inches of stone over the top of the
chamber system, filling the space between
chambers.
NOTE: For a large bed that cannot be filled from
the sides, a light-tracked vehicle must be used.
The ground pressure of the tracks must not
exceed 10 psi for 6” to 12” of cover. Be sure to
maintain a 6 inch minimum of compacted cover
beneath the tracks at all times.
3. Compact the stone with a walk-behind plate
compactor or vibratory roller, not to exceed the
dynamic force of 10,000 lbs.
4. Cover the entire installation area with filter fabric
by taking it from the perimeter and laying it over
the top of the stone. Make sure that it overlaps
onto itself by at least 2 feet.
5. Backfill in a 6-inch lift of well-graded,granular
solid over the top of the filter fabric. Large rocks
and organic matter such as roots, stumps, etc.,
must not be part of the backfill material.
6. Compact the backfill after this and each
additional lift to a minimum of 95% of the
modified Proctor density. Use a vibratory roller
with maximum gross vehicle weight of 12,000 lbs
and a maximum dynamic force of 20,000 lbs.
7. Lay ISI 14,000 or Tensar BX1100 geogrid over
the 6 inches of compacted backfill. If two rolls are
to be placed side-by-side, or end-to-end, overlap
them with a minimum of 2 feet.
NOTE: Geogrid must extend at least 5 feet
beyond the footprint of the chambers. Refer to
manufacture’s specifications for other installation
guidelines.
8. Continue to backfill in 12-inch lifts until the
specified height of the system is achieved.
NOTE: Place the backfill in 6-inch lifts in sandy
soil, compacting after each lift. Refer to special
installation requirements for sandy soil.
9. Begin laying the pavement base.
NOTE: The bed must be protected from traffic
until it is paved.
4 Business Park Road
P.O. Box 768
Old Saybrook, CT 06475
860-577-7000 • Fax 860-577-7001
1-800-221- 4436
www.infiltratorwater.com
U.S. Patents: 4,759,661; 5,017,041; 5,156,488; 5,336,017; 5,401,116; 5,401,459; 5,511,903; 5,716,163; 5,588,778; 5,839,844 Canadian Patents: 1,329,959; 2,004,564 Other patents pending. Infiltrator, Equalizer,
Quick4, and SideWinder are registered trademarks of Infiltrator Water Technologies. Infiltrator is a registered trademark in France. Infiltrator Water Technologies is a registered trademark in Mexico. Contour,
MicroLeaching, PolyTuff, ChamberSpacer, MultiPort, PosiLock, QuickCut, QuickPlay, SnapLock and StraightLock are trademarks of Infiltrator Water Technologies
PolyLok is a trademark of PolyLok, Inc. TUF-TITE is a registered trademark of TUF-TITE, INC. Ultra-Rib is a trademark of IPEX Inc.
© 2016 Infiltrator Water Technologies, LLC. All rights reserved. Printed in U.S.A.
Inltrator Water Technologies, LLC Limited Warranty
Available at: www.inltratorwater.com
or call 1-800-221-4436
Contact Infiltrator Water Technologies’ Services Department for assistance at 1-800-221-4436
A100 0416ISI
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