1 Pa. Code § 35.30
Petitions to intervene and notices of intervention may be filed at any time following the filing of an application, petition, complaint, or other document seeking agency action, but in no event later than the date fixed for the filing of petitions to intervene in any order or notice with respect to the proceedings published in the Pennsylvania Bulletin, unless, in extraordinary circumstances for good cause shown, the agency authorizes a late filing. Where a person has been permitted to intervene notwithstanding his failure to file his petition within the time prescribed in this section, the agency head or presiding officer may, where the circumstances warrant, permit the waiver of the requirements of § 35.169 (relating to copies to parties and agency) with respect to copies of exhibits for the intervener.
1 Pa. Code § 35.30
This section cited in 1 Pa. Code § 31.3 (relating to definitions); 7 Pa. Code §131.14 (relating to interveners); 7 Pa. Code §179.17 (relating to intervention); 25 Pa. Code §1021.81 (relating to intervention); 28 Pa. Code § 301.7 (relating to fair hearing); 34 Pa. Code §111.15 (relating to no other pleadings allowed); 34 Pa. Code §131.32 (relating to petitions except petitions for joinder and challenge proceedings); 37 Pa. Code §197.40a (relating to petition to intervene); 40 Pa. Code §17.13 (relating to protests/intervention procedure); 49 Pa. Code §19.33 (relating to intervention); 52 Pa. Code §5.74 (relating to filing of petitions to intervene); 52 Pa. Code §1005.34 (relating to filing of petitions to intervene); 58 Pa. Code §493a.12 (relating to intervention); 61 Pa. Code §703.2 (relating to petition content); 67 Pa. Code §441.3 (relating to permit application procedure); and 67 Pa. Code §491.6 (relating to notice and conduct of hearing).