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Stoddard dry cleaning

A dry cleaner here in MN who cleans leather is in the process of evaluating 
switching most or all of his shop from perc to 155 degree stoddard.  He is 
interested in getting to the point where he has no hazardous waste to 
dispose.  He has done some analysis and found there is chromium in the still 
residue, apparently coming from the leather from the tanning process!  Has 
anyone else come across this, and how have you dealt with in?