1. (1) An owner or operator of an asphalt plant shall comply with the following:

   1. (a) ensure opacity does not exceed 10% opacity and opacity observations shall be conducted in accordance with 40 CFR 60, Method 9;
   2. (b) use natural gas, propane, fuel oil, on-specification used oil as defined in Rule R315-15, or any combination thereof as fuel;
   3. (c) maintain records of fuel use;
   4. (d) control particulate emissions from each storage silo with a fabric filter, a baghouse, a bin vent, or a dust collector;
   5. (e) control particulate emissions from each asphalt mixer with a baghouse;

   6. (f) maintain the pressure drop of the asphalt plant baghouse between 3.0 and 7.0 inches of water during operation and additionally the owner or operator shall comply with the following:

      1. (i) install a pressure gauge on each baghouse;
      2. (ii) ensure the pressure gauge measures the pressure drop in 1-inch water column increments or less;
      3. (iii) calibrate the pressure gauge according to the manufacturer's instructions at least once every 12 months; and
      4. (iv) record the reading of the pressure gauge at least once per operating day.

2. (2) The owner or operator shall:

   1. (a) ensure filterable PM2.5 emissions do not exceed 0.024 grains per dry standard cubic foot;
   2. (b) conduct an initial stack test on each asphalt plant within 180 days after startup;
   3. (c) conduct a stack test on each asphalt plant within three years after the date of the most recent stack test;
   4. (d) conduct stack testing according to Rule R307-165; and
   5. (e) determine PM2.5 emissions by 40 CFR 60, Appendix A, Method 5.

KEY: air pollution, permits, approval orders, greenhouse gases

Date of Last Change: March 31, 2025

Authorizing, and Implemented or Interpreted Law: 19-2-104(3)(b)(iii); 19-2-108