(4) Weighted average limitations as follow apply:(a) No owner or operator of a packaging rotogravure, publication rotogravure, or flexographic printing press shall apply coatings and/or inks on the subject printing press unless the weighted average, by volume, VOC content of all coatings and/or inks, as applied, each day on the subject printing press is equal to or less than the limitation specified in either Part (3)(a)1 or (3)(b)1 [as determined by Subparagraph (4)(d)]; (3)(a)2 or (3)(b)2 [as determined by Subparagraph (4)(e)]; or, in the case of packaging rotogravure or flexographic printing, (3)(a)3 [as determined by Subparagraph (4)(f)] of this rule.(b) An owner or operator may comply with the weighted average limitation by grouping coatings and/or inks used on a printing press into two categories that meet the conditions in Parts 1 and 2 of this subparagraph as follow. (Any use of averaging between the two categories of coatings and/ or inks used on a packaging rotogravure press or on a flexographic press requires compliance with the emission standard in Part (3)(a)3, as determined by the equation in Subparagraph (f) of this paragraph.): 1. The weighted average VOC content for the first category shall comply with Part (3)(a)1 or (3)(b)1 of this rule, as determined by applying the equation in Subparagraph (d) of this paragraph to the coatings and/or inks in this first category.2. The weighted average VOC content for the second category shall comply with Part (3)(a)2 or (3)(b)2 of this rule, as determined by applying the equation in Subparagraph (e) of this paragraph to the coatings and/or inks in this second category.(d) The following equation shall be used to determine if the weighted average VOC content of all coatings and/or inks, as applied, on the subject printing press exceeds the limitation specified in Part (3)(a)1 or (3)(b)1 of this rule: Click to view Image
where:
VOC(i)(A) = The weighted average VOC content in units of percent VOC by volume of all coatings and/or inks (excluding water and/or exempt compounds) used each day;
i = Subscript denoting a specific coating or ink, as applied;
n = The number of different coatings and/or inks, as applied, each day on a printing press;
Li = The liquid volume of each coating or ink, as applied, used that day in units or liters (L) (gallons [gal]);
Vsi = The volume fraction of solids in each coating or ink, as applied; and
VVOCi = The volume fraction of VOC in each coating or ink, as applied.
(e) The following equation shall be used to determine if the weighted average VOC content of all coatings and/or inks, as applied, on the subject printing press exceeds the limitation specified in Part (3)(a)2 or (3)(b)2 of this rule: Click to view Image
where:
VOC(i)(B) = The weighted average VOC content in units of percent VOC by volume of the volatile content of all coatings and/or inks used each day;
i = Subscript denoting a specific coating or ink, as applied;
n = The number of different coatings and/or inks, as applied, each day on a printing press;
Li = The liquid volume of each coating or ink, as applied, in units or L (gal);
VVOCi = The volume fraction of VOC in each coating or ink, as applied; and
VVCi = The volume fraction of volatile matter in each coating or ink, as applied.
(f) The following equation shall be used to determine if the weighted average VOC content of all coatings and/or inks, as applied, on the subject printing press exceeds the limitation specified in Part (3)(a)3 of this rule: Click to view Image
where:
VOC = The weighted average VOC content in units of mass of VOC per mass of (i)(C) coating and/or ink solids;
i = Subscript denoting a specific coating or ink, as applied;
n = The number of different coatings and/or inks, as applied, each day on a printing press;
Li = The liquid volume of each coating or ink, as applied, used on the day in units of L (gal);
Di = The density of each coating or ink, as applied, in units of mass of coating or ink per unit volume of coating or ink;
WVOCi = The weight fraction of VOC in each coating or ink, as applied; and
Wsi = The weight fraction of solids in each coating or ink, as applied.