Tanks were decommissioned and degassed with residual liquids treated through a 4-stage mobile water treatment plant. Tank supports were removed and steel walls in a bulkhead design were disassembled. Foundations were removed and excavations validated to demonstrate the soil was free from contamination. Recovered soil was backfilled within the tank voids and stabilised, the providing a substantial cost saving to the Client as this negated the need for soil disposal and subsequent import of engineered fill material.