In an email from Chevron:

In the wake of hurricane Katrina, Chevron sent out a number of communications to its employees in the affected areas.  One of these communications was a technical document that field personnel could use with customers who had vehicles (commercial or personal) exposed to water.  Another is a letter to customers, marketers and field sales that addresses general safety issues, lubricant recovery and equipment start-up.  One is attached and the other follows...Post_Hurricane_Letter_9_12.pdf