Investigated Vessel Incidents in Washington State: Pacific States/British Columbia Data (A Pareto View)

In the following graphs, please note the following:

"Incidents" includes spills.
Data for 1999 through December 31, 2007 -- a total of 86 investigations, 84 for which cause was determined.
Causal information collected in accordance with Pacific States/British Columbia Oil Spill Task Force

Data Dictionary.

"Immediate Cause": "Action or inaction that immediately preceded and led to the spill and/or event or near-miss."

"Contributing Factors": "Factors that contributed or led to the immediate cause. The principal contributing factor is sometimes called the 'root cause'."

" Prefixes on categories: "EF"= "Equipment Failure"; "OF" = "Organizational Factor"; "HF"= "Human Factor"; "EXT"= "Environmental Factor"