Terms used in this subpart are defined in the Clean Air Act, in Sec. 63.2, or in this section as follows:
Equivalent P2O5 feed means the quantity of phosphorus, expressed as phosphorous pentoxide, fed to the process.
Evaporative cooling tower means an open water recirculating device that uses fans or natural draft to draw or force ambient air through the device to remove heat from process water by direct contact.
Exceedance means a departure from an indicator range established under this subpart, consistent with any averaging period specified for averaging the results of the monitoring.
HAP metals mean those metals and their compounds (in particulate or volatile form) that are included on the list of hazardous air pollutants in section 112 of the Clean Air Act. HAP metals include, but are not limited to: antimony, arsenic, beryllium, cadmium, chromium, lead, manganese, nickel, and selenium expressed as particulate matter as measured by the methods and procedures in this subpart or an approved alternative method. For the purposes of this subpart, HAP metals are expressed as particulate matter as measured by 40 CFR part 60, appendix A, Method 5.
Phosphate rock calciner means the equipment used to remove moisture and organic matter from phosphate rock through direct or indirect heating.
Phosphate rock dryer means the equipment used to reduce the moisture content of phosphate rock through direct or indirect heating.
Phosphate rock feed means all material entering any phosphate rock dryer or phosphate rock calciner including moisture and extraneous material as well as the following ore materials: fluorapatite, hydroxylapatite, chlorapatite, and carbonateapatite.
Purified phosphoric acid process line means any process line which uses a HAP as a solvent in the separation of impurities from the product acid for the purposes of rendering that product suitable for industrial, manufacturing or food grade uses.
Research and development facility means research or laboratory operations whose primary purpose is to conduct research and development into new processes and products, where the operations are under the close supervision of technically trained personnel, and where the facility is not engaged in the manufacture of products for commercial sale in commerce or other off-site distribution, except in a de minimis manner.
Superphosphoric acid process line means any process line which concentrates wet-process phosphoric acid to 66 percent or greater P2O5 content by weight.
Total fluorides means elemental fluorine and all fluoride compounds, including the HAP hydrogen fluoride, as measured by reference methods specified in 40 CFR part 60, appendix A , Method 13 A or B, or by equivalent or alternative methods approved by the Administrator pursuant to Sec. 63.7(f).
Wet process phosphoric acid process line means any process line manufacturing phosphoric acid by reacting phosphate rock and acid.