This revision, Issue 6, has been made to clarify and update some areas of the guidelines based on well-operator experience and feedback. It supersedes the guidelines that were originally published in 1995 and then revised and published as Issue 1 in July 2001, with updates in July 2005 as Issue 2, in March 2009 as Issue 3, in July 2012 as Issue 4 and in July 2015 as issue 5.
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