For effective tank installation, how often should the backfill be compacted?

Compacting the backfill after each lift is crucial for ensuring the stability and integrity of the tank installation. This practice helps to eliminate air pockets and reduces the risk of settlement or shifting of the backfill material once the tank is in operation. Each lift represents a layer of backfill, and by compacting after each lift, you ensure that every layer is adequately settled and provides uniform support to the structure above.

If compaction is delayed until after multiple lifts, there is a greater risk of uneven settlement occurring, which can lead to structural issues over time. Immediate compaction also allows for better control of the moisture content and density of the backfill material, making sure that it meets the engineering specifications required for a safe and effective installation.

Overall, this approach enhances the long-term performance and safety of the underground storage tank system, allowing it to withstand external pressures and environmental conditions.