Incidents That Define Process Safety: Page 58, Page 101, and Page 314

• On page 58, in describing the catastrophic incident in Mexico City, Incidents that Define Process Safety states that the largest explosion was measured at .5 on the Richter Scale  by a seismometers that was 20 km away. Since publication, it has been pointed out that some references give 0.5 as the Richter scale value while others give 5.

• P. 101, the 2nd sentence in the 2nd paragraph should read:

     "The HF inventory on the Alkylation unit had been transferred into the onsite storage drum as the unit was being prepared for overhaul."

• On page 314, the date next to the title Exxon Valdez, Alaska is July 10, 1976. It should read March 24, 1989.