Approvals under this article are dependent upon and limited to the proposals and plans contained in the application and supporting documents submitted and affirmed to by the applicant. Any variation from the plans, proposals, and supporting documents, except minor changes that do not affect approval standards, is subject to review and approval as provided herein. Minor changes that do not alter the essential nature of the proposal or affect approval criteria may be approved by the Planning Director by written endorsement of the changes on the approved plan. The procedure for obtaining review and approval of other amendments shall be determined by the Planning Director based on the classification of the amendment itself. The applicant shall provide a date and description of changes on all revised plans and documents. A generic statement that revisions are "per staff comments" shall not be adequate.