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§ 61.122 Emission standard.
Emissions of polonium-210 to the ambient air from all calciners and nodulizing kilns at an elemental phosphorus plant shall not exceed a total of 2 curies a year; except that compliance with this standard may be conclusively shown if the elemental phosphorus plant:
(a) Installs a Hydro-Sonic ® Tandem Nozzle Fixed Throat Free-Jet Scrubber System including four scrubber units,