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Table 1 to Subpart AA of Part 63—Existing Source Emission Limits <sup>a b</sup>

Existing Source Emission Limits <sup>a b</sup>

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  11. Appendix Table 1 to Subpart AA of Part 63
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Displayed edition2026-04-27
Last updated2026-04-27

Table 1 to Subpart AA of Part 63—Existing Source Emission Limits a b

For the following existing sources . . .You must meet the emission limits for the specified pollutant . . .
Total fluoridesTotal particulateMercury
Wet-Process Phosphoric Acid Line0.020 lb/ton of equivalent P2 O5 feed
Superphosphoric Acid Process Line c0.010 lb/ton of equivalent P2 O5 feed
Superphosphoric Acid Process Line with a Submerged Combustion Process0.20 lb/ton of equivalent P2 O5 feed
Phosphate Rock Dryer0.2150 lb/ton of phosphate rock feed
Phosphate Rock Calciner9.0E-04 lb/ton of rock feed d0.181 g/dscm0.23 mg/dscm corrected to 3-percent oxygen e
a The existing source compliance data is June 10, 2002, except as noted.
b During periods of startup and shutdown, for emission limits stated in terms of pounds of pollutant per ton of feed, you are subject to the work practice standards specified in § 63.602(f).
c Beginning on August 19, 2018, you must include oxidation reactors in superphosphoric acid process lines when determining compliance with the total fluorides limit.
d Compliance date is August 19, 2015.
e Compliance date November 3, 2020.

[85 FR 69512, Nov. 3, 2020]