Existing MSWLF unit
Existing MSWLF unit means any municipal solid waste landfill unit that is receiving solid waste as of the appropriate dates specified in 258.1. Waste placement in existing units must be consistent with past operating practices or modified practices to ensure good management.
40 CFR § 258.2
Unless otherwise noted, all terms contained in this part are defined by their plain meaning. This section contains definitions for terms that appear throughout this part; additional definitions appear in the specific sections to which they apply.