- Support or batter excavation sides before anyone enters the tank excavation.
- Use a lift plan for placing precast sections or heavy crate pallets.
- Inspect geomembrane wrapping for punctures before and during backfilling.
- Follow the designer backfill specification for material type and compaction.
- Secure lightweight geocellular crates against wind displacement during installation.
- Dewater the excavation to keep the formation dry for tank placement.
- Ensure safe access and egress is provided within the excavation at all times.
- Check for buried services before excavating the tank formation area.
- Obtain temporary works approval if traffic loads will cross the excavation.
- Record installation details including membrane integrity checks for handover.
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- DON'T enter unsupported excavations for attenuation tank installation.
- DON'T lift precast tank sections without an approved lift plan in place.
- DON'T puncture the geomembrane with tools, boots, or sharp aggregate.
- DON'T backfill with materials that differ from the designer specification.
- DON'T place heavy plant or traffic loads over the tank without design approval.
- DON'T leave lightweight crate systems unsecured in windy conditions on site.
- DON'T compact backfill directly against geocellular crates without protection.
- DON'T allow water to accumulate in the excavation during tank placement.
- DON'T skip buried service checks before starting the excavation work.
- DON'T deviate from the installation sequence in the method statement.
See also: Below Ground Drainage Installation | Excavation Safety Awareness
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