Underground storage tanks (USTs) containing petroleum products, heating oil or other regulated substances are a common source of soil and groundwater contamination. In BC, their removal is tightly regulated to protect human health and the environment.
When is UST Removal Required?
Tank removal may be required when:
- The tank has reached the end of its design life (typically 25-30 years for steel tanks)
- Property is being sold and the buyer requires removal as a condition of sale
- A leak has been detected or suspected
- Local bylaws require removal for development permits
- The tank is no longer in service and abandonment-in-place is not approved
The Removal Process
- Pre-Removal Assessment - A qualified professional assesses the site, identifies the tank location and reviews historical records. Soil and groundwater samples may be collected before excavation begins.
- Permitting - Fire department, municipal and environmental permits are obtained. A removal plan is submitted to the local authority having jurisdiction.
- Tank Contents Removal - Remaining product and sludge are pumped out and disposed of as hazardous waste. The tank is then cleaned and made safe for excavation.
- Excavation - The tank is carefully excavated, inspected for signs of corrosion or leakage, and removed. Soil samples are collected from the tank bed and sidewalls.
- Soil Assessment - Samples are analyzed against CSR standards. If contamination is found, additional excavation or remediation is required.
- Backfill and Restoration - Once the excavation passes environmental standards, the pit is backfilled with clean material and the surface is restored.
- Reporting - A closure report documenting the entire process, including analytical results and disposal records, is prepared and submitted to the Ministry.
Working with a company that handles both the environmental assessment and the physical tank removal streamlines the process and reduces the risk of delays from miscommunication between contractors.