40 CFR 420.21: Specialized definitions.

As used in this subpart:

(a) For the sintering subcategory, the term product means sinter agglomerated from iron-bearing materials.

(b) The term dry air pollution control system means an emission control system that utilizes filters to remove iron-bearing particles (fines) from blast furnace or sintering off-gases.

(c) The term minimum level (ML) means the level at which the analytical system gives recognizable signals and an acceptable calibration point. For 2,3,7,8-tetrachlorodibenzofuran, the minimum level is 10 pg/L per EPA Method 1613B for water and wastewater samples.

(d) The term pg/L means picograms per liter (ppt = 1.0 × 10-12 gm/L).

(e) The term sintering means a process for agglomerating iron-bearing materials into small pellets (sinter) that can be charged to a blast furnace.

(f) The term wet air pollution control system means an emission control system that utilizes water to clean process or furnace off-gases.