Any interested person, as described by Government Code, §2001.021, may petition the department requesting the adoption of a rule. Such petition must be in writing directed to the executive director at the department's headquarters building in Austin and shall contain a clear and concise statement of the substance of the proposed rule, together with a brief explanation of the purpose to be accomplished through such adoption. Within 60 days after receipt, the department will either deny the petition in writing, stating its reasons therefor, or will initiate rulemaking proceedings in accordance with the Administrative Procedure Act (Government Code, Chapter 2001, Subchapter B).