(a) In accordance with §330.4(a) of this title (relating to Permit Required), no person may cause, suffer, allow, or permit the underground disposal or placement of tires or tire pieces into a tire monofill unless that activity is authorized by a permit from the commission. No person may begin physical construction of a tire monofill without first having submitted a permit application in accordance with §§330.50-330.65 of this title (relating to Permit Procedures) and received a permit from the commission.(b) A separate permit is not required for the underground disposal or placement of tires or tire pieces into a tire monofill if the underground disposal or placement occurs within the permit boundary at a permitted municipal solid waste landfill site. Such disposal or placement shall be conducted only as authorized by the approved site development plan, or by a permit modification or amendment, as appropriate.