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1.1.8:

Activate liquid level alarm by raising and

lowering float in clarifier to test both audible and
visible alarms. Disrupt the air pressure by
disconnecting the air pressure tubing from the
electrical enclosure inside

OPS

to test air

pressure alarms. If any problem is experienced
with alarm functions, make necessary
adjustments, corrections, and/or repairs. If
optional remote alarm has been installed, be
sure that its audible and visual alarms are also
working correctly.

1.1.9:

The switch indicated “normal/silence” on

OPS

models 50-11, 20, -30 & -32 is used to

test the alarms, silence an alarm condition, or is
left in the normal on position. The normal
position of the mode is for normal operation of
the plant and silence is a mode that will disrupt
both the audible and visual alarm. Move the
switch to the left and hold to test the alarms.
The test switch will reset itself automatically.
These alarms should always be tested before
leaving the site to assure they are operational.

1.1.10:

If optional effluent pump is included on

system, activate pump float switch to assure
effluent pump is operational; set and adjust
timers as required (if installed).

1.1.11:

Reinstall

Hydro-Action

access covers

being sure to install and tighten tamper-
resistant screws to prevent unauthorized plant
entry.

1.2:

Each site visit requires an investigation of

the solids inventory within the wastewater
treatment plant and a determination of when
excess solids need to be removed from the
system. Follow these procedures in evaluating
solids inventory:

Hydro-Action

plant inspection and

service should be performed a minimum
of every six (6) months. This inspection
and service includes performing a
sludge volume test, which is an indicator
of plant performance. (Refer to section
4.0, Plant Troubleshooting Guide.)

b. When sludge volume in plant aeration

compartment reaches 60% to 80% it is
time to pump the plant and pretreatment
tank (if included). This is usually
necessary every two (2) to six (6) years.

1.3:

Follow these procedures to pump the

sludge solids from the treatment tanks. A
qualified service technician should oversee the
work performed.

1.3.1:

Remove the plant access cover.

1.3.2:

Refer to installation worksheet to

determine which tanks and auxiliary equipment
are included on this particular installation (i.e.,
pretreatment tank, surge tank, pump tank,
access covers of different units). Remove pump
tank access cover (if included). If necessary,
use a shovel to dig down and expose the
pretreatment tank access covers and remove
them. Remove the clean-out adapter plug from
the outlet tee fitting. The tanks are now ready to
be pumped.

1.3.3:

The suction hose should be positioned to

be very near the bottom of the tanks. Care
should be taken not to damage internal
components. The plant and other tanks should
be washed and cleaned while they are being
pumped. The waste from the tanks should be
disposed of in compliance with local, state, and
federal laws.

1.3.4:

It is important that care is taken when

pumping plant and any other tank to assure that
hydraulic displacement of tanks (floating of
tanks) does not occur. Tank flotation may occur
whenever water and solids are removed from
the tank when high groundwater conditions
exist. Any source of water in the soil around the
plant installation could cause the tank to float.
Water sources may include rainfall, springs,
creeks, bayous, rivers, lakes, and coastal
areas.

Proper precautions are therefore required to
prevent tank flotation due to hydraulic
displacement. These precautions include, but
are not limited to, the following:

• Plant location — choose a site that will
minimize possible groundwater saturation.
Consider seasonal water table and soil
conditions in the area of installation. Do not
locate the plant in a low spot in the ground
where water tends to pool or at the edge of any
natural body of water. If such a location cannot
be avoided, call