L1 = f1 * LPG1 + (1-f1) * LPL
Where:
L1 = the lower TF emission limit in kg/Mg (lb/ton);
f1 = the fraction of the potline's total aluminum production capacity that is contained within all modified potroom groups, reconstructed potroom groups, and new potroom groups;
LPG1 = 0.95 kg/Mg (1.9 lb/ton) for prebake potlines and 1.0 kg/Mg (2.0 lb/ton) for Soderberg potlines; and
LPL = the TF emission limit from § 63.843(a)(1) for the appropriate potline subcategory that would have otherwise applied to the potline.
L2 = f1 * LPG2 + (1-f1) * LPL
Where:
L2 = the upper TF emission limit in kg/Mg (lb/ton); and
LPG2 = 1.25 kg/Mg (2.5 lb/ton) for prebake potlines and 1.3 kg/Mg (2.6 lb/ton) for Soderberg potlines.
E = f1 * EPG1 + (1-f1) * EPL
where:
E = the TF emission rate for the entire potline, kg/Mg (lb/ton);
f1 = the fraction of the potline's total aluminum production rate that is contained within all modified potroom groups, reconstructed potroom groups, and new potroom groups;
EPG1 = the TF emission rate from paragraph (g)(1) of this section for all modified potroom groups, reconstructed potroom groups, and new potroom groups, kg/Mg (lb/ton); and
EPL = the TF emission rate for the balance of the potline from paragraph (g)(2) of this section, kg/Mg (lb/ton).
Compliance is demonstrated when TF emissions for the potline meet the requirements in paragraph (e) of this section.
40 C.F.R. §63.845