Representative sample means a sample of a universe or whole (e.g., waste pile, lagoon, and groundwater) which can be expected to exhibit the average properties of the universe or whole. See EPA publication SW-846, Test Methods for Evaluating Solid Waste, Physical/Chemical Methods, Chapter 9 (available at http://www.epa.gov/epawaste/hazard/testmethods/sw846/online/index.htm) for a discussion and examples of representative samples.
40 CFR § 257.53
The following definitions apply to this subpart. Terms not defined in this section have the meaning given by RCRA.