Which statement correctly describes the major RCRA waste lists and the difference between listed and characteristic wastes?

• A. F- and K-listed wastes are generic and source-specific wastes; P- and U-listed wastes are discarded commercial chemical products; D-wastes are characteristic hazardous wastes defined by properties like ignitability, corrosivity, reactivity, or toxicity.
• B. F- and K-listed wastes are discarded commercial chemical products; P- and U-listed wastes are generic and source-specific wastes; D-wastes are non-hazardous.
• C. P- and U-listed wastes are generic wastes from industrial processes; F- and K-listed wastes are discarded chemical products; D-wastes are inert materials with no hazardous characteristics.
• D. D-wastes are listed wastes, while F, K, P, and U are hazardous characteristics.

Answer: (A)

Understanding RCRA waste lists starts with how wastes are categorized into listing-based wastes and characteristic wastes. The listed wastes are organized into F and K, which cover wastes from general industrial processes (F) and from specific sources or industries (K). The P and U lists consist of discarded commercial chemical products (P for some acutely hazardous products, U for others). In contrast, characteristic wastes are not on a list but are identified by properties that make them hazardous, such as ignitability, corrosivity, reactivity, or toxicity. These characteristics are determined through tests like the TCLP for toxicity and other standard tests for the other properties. So the statement that F- and K-listed wastes are generic and source-specific wastes; P- and U-listed wastes are discarded commercial chemical products; D-wastes are characteristic hazardous wastes defined by properties like ignitability, corrosivity, reactivity, or toxicity is the correct description. The other options mix up what each list represents and describe D-wastes incorrectly as non-hazardous or inert, which they are not.