(a) Except as provided by Subsection (b), Class I nonhazardous industrial solid waste and small quantities of hazardous waste generated by conditionally exempt small quantity generators, as defined by the commission, may be accepted in a municipal solid waste facility if:
(1) authorized in writing by, or by rule of, the commission; and
(2) the generator of the Class I nonhazardous waste certifies on an appropriate commission form that the waste is not a hazardous waste.
(b) Except as otherwise prohibited by this chapter, nonhazardous industrial solid waste generated by the mechanical shredding of motor vehicles, appliances, or other items of scrap, used, or obsolete metals shall be accepted, without authorization by the commission under Subsection (a), in a municipal solid waste facility that has previously been authorized to accept and has accepted Class I nonhazardous industrial solid wastes or Class II industrial solid wastes if the waste contains no free liquids, is not a hazardous waste as defined in § 361.003, and satisfies other criteria that may be established by commission rule. Until the commission adopts rules establishing additional criteria, generators of this type of waste shall satisfy the two criteria described in this subsection when these wastes are disposed of in municipal solid waste facilities.