PSI was subcontracted to vacuum the contents of a UST (Underground Storage Tank) during a construction project. The 900 gallon underground tank was discovered by an excavating company contracted for restoration work within the city limits of a small rural county.
Not knowing if the tank was used for fuel or waste oil storage 80 years ago, all facets of safety and environmental issues had to be addressed, including grounding all mobile vacuuming equipment and purging the tank. Once excavated and brought to the surface, PSI vacuumed and rinsed the tank, and all effluent was safely transferred to steel drums and labeled for waste characterization to be transferred off-site.