Rules applying to various operations are adopted by the District as part of a plan to meet state and federal air quality standards and are listed in the District Rule.
An automotive body repair shop, for instance, may be subject to the requirements of District Rule 4612 (Motor Vehicle and Mobile Equipment Refinishing Operations). Some prohibitory rules, such as 4201 (Particulate Matter Concentration), apply to all sources that emit a specific air contaminant. The prohibitory rules are a part of Regulation IV in the District Rule.
Rules in Regulation VII of the Rule apply to specific sources of toxic air contaminants. District Rule 7012 (Hexavalent Chromium – Cooling Towers), for example applies to cooling towers in which circulating water is exposed to the atmosphere.
Rules that directly govern the permitting process are contained in Regulation II of the District Rule. For instance, Rules 2010 (Permits Required) and 2020 (Exemptions) describe the equipment or operations that must obtain permits. Rule 2201 (New and Modified Source Review) is one of the most important rules to project proponents, as its requirements apply to every facility installing or modifying equipment that requires permits. See “What is New Source Review?”, below, for an overview of this rule.
