Tank Openings: Inspection hatches on top of the storage
tanks are there for providing access to liquid level indicators
and control devices, access to submersible booster pumps
inside the tanks, and for visual inspection of the water
level and sediment accumulation on the bottom of the tank.
The access hatches of underground storage tanks are typically
sealed with a gasket and multiple bolts to maintain air tight
and watertight seals close to the ground. Opening these
hatches can easily provide an opportunity for dirt, debris,
and bacteria to get inside the tank anytime the seal is broken.