The Sept 23 Method Update Rule lists several new BOD and DO methods. It would be instructive to look closely at the one listed as In-Situ Method 1003-8-2009 for BOD.  It can be found at the following link:

http://www.in-situ.com/cp/uploads/In_Situ_ATP_BOD_Method.pdf

In case you thought that BOD's couldn't get any more involved.....read closely.