22
10.4.1 Tank base/plinth:
•
Remove any soft spots or large stones and boulders
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The base is constructed of compacted gravel. Refer to 10.5.1
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Ensure that base is level and at the correct height to accommodate the incoming pipe work
10.4.2 Installing onto the base/plinth:
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Mechanically lift the plant carefully into the center of the hole and place on the prepared plinth
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The plant
must sit dead level on the plinth
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Connect and seal the pipe work to the tank.
10.4.3 Backfilling dry site:
Refer to backfill specification appropriate for site conditions
•
Ballast* the plant by filling each chamber with clean water to a depth of 300mm and recheck
the pipe work levels. Commence backfilling with gravel as per section 10.5.1 in layers of
225mm evenly around the tank ensuring that there are no voids. Compact each layer ensuring the
vibrating machine does not come in contact with the plant. Continue filling the chambers
whilst backfilling, ensure that the progressive water level is no more than 300mm above the
backfill level.
•
Continue to backfill until gravel has reached 50mm over the cylindrical body of the tank.
•
Mount and seal manhole risers (if used)
•
Complete backfilling with topsoil up to the max ground level line.
* Ballasting the plant is important to avoid the tank from lifting when backfilling.