En is the total halogenated HAP solvent emissions from the solvent cleaning machine during the most recent monthly reporting period i, kilograms of solvent per month (pounds of solvent per month)

SAi is the total amount of halogenated HAP liquid solvent added to the solvent cleaning machine during the most recent monthly reporting period i, kilograms of solvent per month (pounds of solvent per month)

LSRi is the total amount of halogenated HAP liquid solvent removed from the solvent cleaning machine during the most recent monthly reporting period i, kilograms of solvent per month (pounds of solvent per month)

SSRi is the total amount of halogenated HAP solvent removed from the solvent cleaning machine in solid waste, obtained as described in par. (b), during the most recent monthly reporting period i, kilograms of solvent per month (pounds of solvent per month)

AREAi is the solvent/air interface area of the solvent cleaning machine, square meters, (square feet)

NR 469.09(3)(b) (b) Determine SSRi using the method specified in subd. 1. or 2.

NR 469.09(3)(b)1. 1. From tests conducted using Method 25D in Appendix A of 40 CFR part 60, incorporated by reference in s. NR 484.04.

NR 469.09(3)(b)2. 2. By engineering calculations included in the compliance report, which is described in s. NR 469.12 (6).

NR 469.09(3)(c) (c) Determine the monthly rolling average, EA, for the 3-month period ending with the most recent reporting period using equation 4 for cleaning machines with a solvent/air interface or equation 5 for cleaning machines without a solvent/air interface.

(Equation 4)

(Equation 5)

where:

EAi is the average halogenated HAP solvent emissions over the preceding 3 monthly reporting periods, kilograms of solvent per square meter of solvent/air interface area per month (pounds of solvent per square foot of solvent/air interface area per month)

EAn is the average halogenated HAP solvent emissions over the preceding 3 monthly reporting periods, kilograms of solvent per month (pounds of solvent per month)

Eij is the halogenated HAP solvent emissions for each month (j) for the most recent 3 monthly reporting periods, kilograms of solvent per square meter of solvent/air interface area per month (pounds of solvent per square foot of solvent/air interface area per month)

Enj is the halogenated HAP solvent emissions for each month (j) for the most recent 3 monthly reporting periods, kilograms of solvent per month (pounds of solvent per month)

j=1 is the most recent monthly reporting period

j=2 is the monthly reporting period immediately prior to j=1

j=3 is the monthly reporting period immediately prior to j=2

NR 469.09(4) (4) Each owner or operator of a batch vapor or in-line solvent cleaning machine using dwell to comply with ss. NR 469.04 to 469.07 shall determine the appropriate dwell time for each part or parts basket using the procedure specified in pars. (a) and (b).

NR 469.09(4)(a) (a) Determine the amount of time for the part or parts basket to cease dripping once placed in the vapor zone. The part or parts basket used for this determination shall be at room temperature before being placed in the vapor zone.

NR 469.09(4)(b) (b) The proper dwell time for parts to remain in the freeboard area above the vapor zone is no less than 35% of the time determined in par. (a).

NR 469.09(5) (5) An owner or operator of a source shall determine the source’s potential to emit from all solvent cleaning machines, using the procedures described in pars. (a) to (c).

NR 469.09(5)(a) (a) Determine the potential to emit for each individual solvent cleaning machine using equation 6.

(Equation 6)

where:

PTEi is the potential to emit for solvent cleaning machine i, kilograms of solvent per year (pounds of solvent per year)

Hi is hours of operation for solvent cleaning machine i (hours per year)

= 8760 hours per year, unless otherwise restricted by a federally enforceable requirement