This rule revises existing procedures for appeals from RCRA, UIC, NPDES, PSD or other final permit decisions that are filed with the Environmental Appeals Board in an effort to simplify and make more efficient the review process, particularly in appeals from permits issued under new source review provisions. Most significantly, the changes reconcile current provisions of the regulation governing appeals, which over time has proven to be somewhat confusing and redundant. The changes will bring the regulation more fully in line with current practice. Under the current rule, a Petitioner is required to file a substantive petition for review demonstrating that review is warranted. The Environmental Appeals Board considers that substantive petition, as well as any briefs filed in response to the petition, to determine whether to grant review. If review is granted, the current rule contemplates that a second substantive round of briefing is begun and another substantive review process occurs. In practice, however, the Board has determined that a second round of briefing generally is unnecessary because in nearly all cases, a decision on the merits can be made based on the substantive briefs already filed. The changes to the rule clarify to practitioners that substantive briefing must be submitted at the outset of the appeal and that one substantive review will occur. Additional briefing may be ordered when the Board determines it warranted. A number of additional provisions governing procedure are also added to the rule to reflect existing practices that are currently guided by standing orders of the Environmental Appeals Board and its Practice Manual. Revising the regulation to reflect current practice will provide clarity to practitioners before the Board, which will in turn make the appeals process more efficient by avoiding unnecessary filings and Board orders.