The closure, post-closure, or corrective action cost estimate requirements of this section apply to owners and operators of any municipal solid waste facility authorized under this chapter required to have financial assurance and any municipal solid waste process facility as defined in § 330.5(a) of this title (relating to Classification of Municipal Solid Waste Facilities) that stores combustible material outdoors, or that poses a significant risk to public health and safety as determined by the executive director.
30 Tex. Admin. Code § 330.501