Where:
C = Average VOHAP concentration of the material on a mass-weighted basis, ppmw.
i = Individual sample "i" of the material.
n = Total number of samples of the material collected (at least 4 per stream) for the averaging period (not to exceed 1 year).
Qi = Mass quantity of material stream represented by Ci, kilograms per hour (kg/hr).
QT = Total mass quantity of all material during the averaging period, kg/hr.
Ci = Measured VOHAP concentration of sample "i" as determined according to the requirements of paragraph (b)(2) of this section, ppmw.
40 C.F.R. §63.7943