1.1 This guide covers common techniques for obtaining representative subsamples from a sample received at a laboratory for analysis. These samples may include solids, sludges, liquids, or multilayered liquids (with or without solids). 1.2 The pr This guide covers common techniques for laboratory subsampling of media related to waste management activities. This guide includes several sample homogenization techniques, including mixing and grinding, as well as information on how to obtain a speci