No. Rulemaking is within the scope of executive branch "action" governed by the Executive Branch Lobbying Rule. However, to influence rulemaking according to the rule, one would need to influence a "decision" of an agency regarding the "proposal; drafting; development; consideration; promulgation; amendment; repeal or rejection of a rule. Since IDEM would not be the "agency" making the decision concerning the proposal, drafting, development, consideration, promulgation, amendment, repeal or rejection of the rule in question, then they would have no "decision" to try to influence.
For more information, see the Executive Branch Lobbyist Registration Rule, visit the Executive Branch Lobbyist website at http://www.in.gov/idoa/2885.htm, or call (317) 234-4431.