A toxic liquid is pumped into a storage vessel. The vessel is equipped with a high-level sensor to stop the flow and sound an alarm if the level is too high. If the level sensor and alarm fail, the vessel will overflow and the toxic material will be released into the operating environment. Use the LOPA method to determine if this system requires additional safeguards. Assume a threshold quantity for the liquid of 5 \(\mathrm{lb}\). The pumping rate is \(1 \mathrm{lb} / \mathrm{min}\) and it will take \(20 \mathrm{~min}\) for the operator to notice the spill and stop the flow manually. Make suggestions for improvement if additional safeguards are required.