The plan applies to each existing commercial and industrial solid waste incinerator unit and air curtain incinerator in the State of Colorado that commenced construction on or before June 4, 2010, or commenced modification or reconstruction after June 4, 2010, but no later than August 7, 2013, as such incinerator units are defined in § 60.2875 of 40 CFR part 60. The plan applies only to units not exempt under the conditions of § 60.2555 of that part.