:: : : I'm no waste expert, but most discussions of waste thirds I can find relate to 42 USC ?6924 ( g ) which specifies a division of waste into three classes or thirds, for disposal in landfill, with the first third the most dangerous and the most highly restricted; the classification of waste into thirds is done by the waste producer not by law .-- talk ) 11 : 16, 15 March 2010 ( UTC)