Before a public body advertises for bids or proposals for a public work contract, it shall request the Commissioner to determine the prevailing wage rate for each classification of worker required to perform the public work contract. The Commissioner shall give notice of each prevailing wage rate determination for a public work contract under this subtitle. On written request, the Commissioner shall mail to any representative of any classification, any employer, or any representative of any group of employers notice: that a determination will be made, at least 60 days before making the determination; and of the determination, after making the determination. After a determination has been made, the public body shall include each prevailing wage rate for straight time and overtime: in any call for bids or proposals; in the specifications for the public work contract; and in the public work contract.