Rule R307-307 has been amended three times since the last five-year review with nonsubstantive changes in 2012 (DAR No. 36628), substantive changes in 2013 (DAR No. 36741), and nonsubstantive changes later in 2013 (DAR No. 37234). Comments were submitted in 2013 regarding the substantive changes being proposed. Those comments were from the Utah Department of Transportation and the Environmental Protection Agency. All comments were suggestions to improve the proposed amendments. No comments were submitted opposing the rule.