Clean wood
Clean wood means untreated wood or untreated wood products including clean untreated lumber, tree stumps (whole or chipped), and tree limbs (whole or chipped). Clean wood does not include two items:
(1) “Yard waste,” which is defined elsewhere in this section.
(2) Construction, renovation, or demolition wastes (for example, railroad ties and telephone poles) that are exempt from the definition of “municipal solid waste” in this section.
Source
40 CFR § 60.1940
Scoping language
Terms used but not defined in this section are defined in the CAA and in subparts A and B of this part.