Confined space and environmental hazards.
cleaning the inside of an underground storage tank that has just
been removed from the ground. He is not wearing any PPE - no
hard hat, no respirator, no chemical resistant clothing.
This is a permit-required confined space entry, and there
is no observer "on duty" as the only other workers are talking
to each other and not paying attention, there is no rescue
person dressed and ready for an emergency, and no retrieval