(a) Use equation 1 of this section to calculate the weighted-average HAP content for all aluminum surface coatings used in the past 12 months.[GRAPHIC] [TIFF OMITTED] TR22AU01.017 Where: HAPSC = weighted-average organic HAP content for all aluminum
coating materials, kilograms of organic HAP per liter of
coating solids.m = number of different aluminum primers, top coats, and clear coats
used in the past 12 months.Voli = volume of aluminum primer, top coat, or clear coat i
used in the past 12 months, liters.Di = density of coating i, kilograms per liter.Wi = mass fraction of organic HAP in coating i, kilograms of
organic HAP per kilogram of coating.p = number of different thinners, activators, and other coating
additives used in the past 12 months.Volk = total volume of thinner, activator, or additive k used
in the past 12 months, liters.Dk = density of thinner, activator, or additive k, kilograms
per liter.Wk = mass fraction of organic HAP in thinner, activator, or
additive k, kilograms of organic HAP per kilogram of thinner
or activator.Solidsi = solids content of aluminum primer, top coat, or
clear coat i, liter solids per liter of coating.
(b) Compliance is based on a 12-month rolling average. If the weighted-average organic HAP content does not exceed 1.22 kilograms of organic HAP per liter of coating solids, then you are in compliance with the emission limit specified in Sec. 63.5743(a)(2).