What is the correct ratio of portable toilets to people?
http://www.psai.org/about.html
According to the above link, it is 1:10.
According to the following link, it is 1:100, or maybe 1:75 or 1:50.
http://racedirector.runnersworld.com/2009/11/how-do-you-handle-calls-of-nature.html
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