chris - no indiv. or small shop will have liability - rcra has an exclusion [loophole] just to protect them
btw - here is nh's web site on this issue:
http://des.nh.gov/organization/commissioner/p2au/pps/ppmp/used_oil.htm
you
must check with your state & local authorities first! an unpermitted jury0-rigged burner is gonna get slammed