After the Planning Commission has approved the sketch plan, and after the public hearing, if any, has been held, the applicant shall submit a site plan as provided in Article 21 of this ordinance. The site plan shall be submitted in four copies and shall also contain detailed sketches of typical roadway, walkway and apron layouts and cross sections. If rezoning is involved, it is at this point that this matter should be acted upon, in accordance with § 33.02.