Maricopa County is proposing to update Rule 316 [Nonmetallic Mineral Processing] and Rule 320 [Odors and Gaseous Air Contaminants] in 2018.
The County has held multiple stakeholder workshops for each of the rules and is proposing the following updates to the rules:
- The proposed rule will focus on emissions of H2S, sulfur in fuel, asphalt day tankers and/or tar kettles, and reduction of animal matter.
- This update is due to the current language being broad, unenforceable and MCAQD's overall intent to improve regulations.
- Additionally, MCAQD states that odors are not considered regulated air pollutants and plans to remove the relevant language from the rule, however, it will still investigate any odor related complaints.
- All fugitive dust control measures for nonmetallic mineral processing and related operations will be consolidated in a single rule - Rule 316.
- MCAQD will incorporate a 20% opacity limit for emissions of blue smoke.
- The rule will include control requirements for dry material storage silos which would be applicable to cement, fly ash, lime, and other pozzolan materials.
- The rule will include more flexible compliance options for wind-blown dust, alternative trackout control requirement, alternative minimum moisture contents for products feeding hot mix asphalt plants, and an alternative test method for soil moisture testing.
- Emission limits from NSPS Subpart OOO will also be included in the proposed rule.