What must be done with chocks or bracing before backfilling?

Before backfilling an underground storage tank (UST) installation, chocks or bracing must be removed. This is crucial for ensuring that the integrity of the tank is maintained and that there is no obstruction within the backfill material. Leaving the chocks or bracing in place can potentially lead to structural issues as the soil settles over time, as the objects could create weak points or voids in the surrounding backfill.

Removing these supports allows for a more uniform distribution of weight and pressure on the tank surface from the backfill material. It also helps in avoiding clogs or blockages in the system that might affect the tank's operational efficiency later on. Proper backfilling techniques are essential for ensuring the longevity and safety of the UST, as improper handling of chocks or bracing can lead to compliance issues as well as safety hazards.