6
pouring.
Concrete ballast should be
cast in-place around the tank
in the excavation (Figure 3).
Alternatively, pre-cast ballast
around the base of the tank,
may be used. Ensure that 1”
to 2” of concrete is placed
beneath the tank base if pre-
cast ballast is used. If the
concrete is pre-cast, lifting
hooks must be anchored in the
ballast to support subsequent
handling of the tank (see Lifting
Instructions). The lifting hooks
used must be adequate to
support the combined weight of
the tank and concrete ballast
and shall be sized and installed
in accordance with the site
engineer’s recommendation.
Place the ballasted tank on
the gravel bedding in the
excavated hole using the
lifting hooks. Do not lift by
any of the tank surfaces if
pre-cast ballast is utilized
.
3. INLET LOCATIONS:
A 4” DWV (standard) inlet
grommet was provided with
the station for sealing the
inlet pipe at the tank wall. If
the inlet grommet penetration
was not factory installed, the
location of the tank inlet must
be determined to support final
positioning of the tank prior to
ballast installation (see Section
2). The inlet pipe location
corresponds with the actual
or projected point where the
building sewer line intersects
the tank wall. The grade of
the inlet pipe and required
burial depth (per national
and local code requirements)
must be accounted for when
determining the inlet location.
The supply cable path
should be considered when
selecting the inlet location (see
Section 8). A 5” diameter field
penetration of the tank wall is
required to support installation
of the (standard) inlet grommet.
This penetration must not
remove or interfere with any
of the structural ribbing on the
polyethylene tank. The inlet
grommet may be installed in
any of the allowable locations
shown in Figure 7. The inlet
penetration
must
be centered
in the location selected to
prevent interference with
the tank ribbing. Typical inlet
installation will be on one of
the four, 10.5” diameter raised
pads on the tank body. The
pads have been marked with
a series of locating lines to
support centering of the 5”
(standard) drilled penetration.
Any inlet installed in the
depressed panels between the
horizontal and vertical ribbing
must be centered within the
panel to provide adequate
clearance for the 6” diameter
flange on the standard 4” inlet
grommet (Figure 7). Once the
location of the inlet penetration
is selected, mark the inlet
center location on the tank
and position the tank. Using
a 5” diameter hole saw for
a standard 4” grommet, drill
through the tank wall at the
marked location. Remove any
chips or burrs from the drilled
hole. Install the provided inlet
grommet into the drilled hole.
The grommet is self-sealing
TYPICAL IN-GROUND SECTION VIEW
Figure 3
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