StacksVerified U.S. regulatory reference

40 CFR §98.290

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
  1. (a)A soda ash manufacturing facility is any facility with a manufacturing line that produces soda ash by one of the methods in paragraphs (a)(1) through (3) of this section:
    1. (1)Calcining trona.
    2. (2)Calcining sodium sesquicarbonate.
    3. (3)Using a liquid alkaline feedstock process that directly produces CO2.
  2. (b)In the context of the soda ash manufacturing sector, “calcining” means the thermal/chemical conversion of the bicarbonate fraction of the feedstock to sodium carbonate.