Why is careful and complete compaction of backfill critical for the lower quadrant of the tank?

Careful and complete compaction of backfill is crucial for ensuring the stability of the tank. When a UST is installed, the soil surrounding it must be properly compacted to create a stable environment that supports the tank. Compacted backfill helps to evenly distribute weight and reduces the risk of settling or shifting over time. This stability is essential because any movement can lead to structural issues with the tank, potentially causing leaks or failures that pose environmental risks and regulatory violations. Well-compacted soil also minimizes the potential for voids that could allow water infiltration or soil erosion, further contributing to the overall integrity and safety of the underground storage system.