Performance Testing

Treated wastes are subjected to physical tests to (1) determine particle size and distribution, porosity, permeability, and dry and wet density; (2) evaluate bulk-handling properties; (3) predict the reaction of a material to applied stresses in embankments and landfills; and (4) evaluate durability under freeze/thaw and wet/dry weathering cycles.

Chemical leach testing determines the chemical stability of treated wastes when in contact with aqueous solu tions encountered in landfills. The procedures demonstrate the immobilization of contaminants by the S/S processes. Many techniques for leach testing are available. The major variables encountered in different leaching procedures are: the nature of the leaching solution; waste to leaching solution ratios; number of elutions of leaching solutions used; contact time of waste and leaching solution; surface area of waste exposed; and agitation technique used. Treated wastes must meet certain maximum leachate concentrations when subject to the Toxicity Characteristic Leaching Procedure (TCLP) determination (see Section 11.4).

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