What is the purpose of installing a filter fabric between backfill and adjacent unstable soils?

The installation of filter fabric between backfill and adjacent unstable soils serves a critical function in maintaining the integrity and stability of underground storage tanks. The primary purpose of this filter fabric is to prevent the migration of backfill material into the unstable soils surrounding it.

By effectively acting as a barrier, the filter fabric ensures that the backfill remains in place and provides the necessary support to the underground tank. If this migration were to occur, the stability and load-bearing capacity of the backfill could be compromised, potentially leading to subsidence or settlement of the tank. This would not only affect the tank's alignment but could also pose risks for leaks and environmental contamination.

This solution is particularly important in areas where soil conditions may change or shift, as it maintains the separation between different soil types and enhances the overall effectiveness of the backfill. The fabric allows for water drainage while ensuring that soil particles do not mix, thus preserving the structural integrity needed for safe and efficient tank operation.