Within 15 business days after the execution of a contract for a tariffed service, the contract must be submitted by advice letter for Commission approval. A Utility that violates the deadline for submittal is liable to such sanctions as the Commission may impose, including but not limited to the penalties set forth in Decision 91-07-010 and the Public Utilities Code, as appropriate. Violation of the deadline does not, in itself, invalidate a contract. In the case of a contract properly submitted for review and disposition by Tier 1 advice letter, the contract may be made effective on the date of execution.