(1) Signs must be placed by the owner or operator at any site in the state which is listed or proposed for listing on the Superfund Site List of the United States Environmental Protection Agency or any site identified by the department as a site contaminated by hazardous waste where there is a risk of exposure to the public. This section does not apply to sites reported under ss. 376.3071 and 376.3072. The department shall establish requirements and procedures for the placement of signs, and may do so in rules, permits, orders, or other authorizations. The authorization shall establish the appropriate size for such signs, which size shall be no smaller than 2 feet by 2 feet, and shall provide in clearly legible print appropriate warning language for the waste or other materials at the site and a telephone number that may be called for further information. (2) Violations of this act are punishable as provided in s. 403.161(4). (3) The provisions of this act are independent of and cumulative to any other requirements and remedies in this chapter or chapter 376, or any rules promulgated thereunder.