16
5.8
Topsoil Requirements
Clean native top soil shall not contain rocks larger than 36mm on largest dimension.
5.9
Risers
In the event that a Tricel Pumping Chamber requires a deeper than standard installation to align with
the wastewater outlet pipe from the dwelling, manhole risers are available for deeper installations to
avoid the access hatch being positioning in a depression, as shown in the diagram:
Risers are available in the following sizes:
•
250mm
(requires installation suitable for the site conditions)
•
500mm
(requires a concrete backfill) *
•
750mm
(requires a concrete backfill) *
* 500mm and 750mm risers cannot be retrofitted unless the correct installation is in place.
•
The Tricel Pumping Chamber is suitable for a maximum manhole riser of 750mm which gives
a maximum inlet invert of 1310mm, as shown below. The Tricel Pumping Chamber is not
suitable where a deeper installation is required.
Important:
•
Never place the access covers below ground level.
•
Only Tricel access covers must be used.
•
Do not allow ground water or storm water to enter the pumping chamber.
Summary of Contents for Pumping Chamber 2600
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