California Code, Public Resources Code - PRC § 4414.5

“Residue” means flammable wood fiber byproducts or waste, including, but not limited to, sawdust, bark, chips, slabs, trimmings, and hogged particles from a sawmill or plant engaged in processing or converting forest products into lumber, shook, ties, poles, posts, veneer, shakes, shingles, and planed or milled products.