A public contractor who introduces hazardous materials into the workplace shall agree, and include a statement, in all bids, agreements, contracts, or other instrument to the effect that such contractor shall be responsible for compliance with the provisions of this chapter for persons employed by such contractor utilized under such contract. Any such public contractor who introduces hazardous chemicals into the workplace shall provide material safety data sheets for such chemicals to all employees using them and instruction in handling, emergency procedures, and disposal prior to introducing such hazardous chemicals. This Code section shall not be construed to place responsibility on any person, firm, or corporation other than public contractors.