DRE = [1 - (Wout / Win)] * 100%
Where:
Win = mass feedrate of one POHC in a waste feedstream; and
Wout = mass emission rate of the same POHC present in exhaust emissions prior to release to the atmosphere.
Ctotal = {Cmill-off * (Tmill-off / (Tmill-off + Tmill-on))} + {Cmill-on * (Tmill-on / (Tmill-off + Tmill-on))}
Where:
Ctotal = time-weighted average concentration of a regulated constituent considering both raw mill on time and off time;
Cmill-off = average performance test concentration of regulated constituent with the raw mill off-line;
Cmill-on = average performance test concentration of regulated constituent with the raw mill on-line;
Tmill-off = time when kiln gases are not routed through the raw mill; and
Tmill-on = time when kiln gases are routed through the raw mill.
Ctot = {Cmain * (Qmain / (Qmain + Qbypass))} + {Cbypass * (Qbypass / (Qmain + Qbypass))}
Where:
Ctot = gas flowrate-weighted average concentration of the regulated constituent;
Cmain = average performance test concentration demonstrated in the main stack;
Cbypass = average performance test concentration demonstrated in the bypass stack;
Qmain = volumetric flowrate of main stack effluent gas; and
Qbypass = volumetric flowrate of bypass effluent gas.
40 C.F.R. §63.1220