where:

CW is the flow-weighted concentration of VOHAP or VOC, ppmv, as hexane

Ci is the concentration of VOHAP or VOC from exhaust stream i, ppmv, as hexane

n is the number of exhaust streams sampled

Qi is the volumetric flow rate of effluent gas from exhaust stream i in dscfm

NR 463.25(3)(f) (f) Triethylamine emissions. To determine compliance with the emissions limit or standard in s. NR 463.23 (1) (a) 11. for a TEA cold box mold or core making line, you shall use the following test methods and procedures:

NR 463.25(3)(f)1. 1. Determine the TEA concentration for each test run according to the test methods in 40 CFR part 60, Appendix A, incorporated by reference in s. NR 484.04 (13), that are specified in subd. 1. a. to e.

NR 463.25(3)(f)1.a. a. Method 1 or 1A to select sampling port locations and the number of traverse points in each stack or duct. If you elect to meet the 99% reduction standard, sampling sites shall be located both at the inlet to the control device and at the outlet of the control device prior to any releases to the atmosphere. If you elect to meet the concentration limit, the sampling site shall be located at the outlet of the control device, or at the outlet of the emissions source if no control device is present, prior to any releases to the atmosphere.

NR 463.25(3)(f)1.b. b. Method 2, 2A, 2C, 2D, 2F or 2G to determine the volumetric flow rate of the stack gas.

NR 463.25(3)(f)1.c. c. Method 3, 3A or 3B to determine the dry molecular weight of the stack gas.

NR 463.25(3)(f)1.d. d. Method 4 to determine the moisture content of the stack gas.

NR 463.25(3)(f)1.e. e. Method 18 to determine the TEA concentration. The Method 18 sampling time shall be sufficiently long such that either the TEA concentration in the field sample is at least 5 times the limit of detection for the analytical method or the test results calculated using the laboratory’s reported analytical detection limit for the specific field samples are less than 1/5 of the applicable emissions limit. The adsorbent tube approach, as described in Method 18, may be required to achieve the necessary analytical detection limits. The sampling time shall be at least one hour in all cases.

NR 463.25(3)(f)2. 2. Conduct the test as soon as practicable after adding fresh acid solution and the system has reached normal operating conditions.

NR 463.25(3)(f)3. 3. If you use a wet acid scrubber that is subject to the operating limit in s. NR 463.23 (1) (b) 5. b. for pH level, determine the pH of the scrubber blowdown using one of the following procedures:

NR 463.25(3)(f)3.a. a. Measure the pH of the scrubber blowdown with the CPMS required in s. NR 463.26 (1) (f) 2. during each TEA sampling run in intervals of no more than 15 minutes. Determine and record the 3-hour average.

NR 463.25(3)(f)3.b. b. Measure and record the pH level using the probe and meter required in s. NR 463.26 (1) (f) 2. once each sampling run. Determine and record the average pH level for the 3 runs.

NR 463.25(3)(f)4. 4. If you are subject to the 99% reduction standard, calculate the mass emissions reduction using Equation 4:

=

Equation 4

where

Ei is the mass emissions rate of TEA at control device inlet, kg/hr

Eo is the mass emissions rate of TEA at control device outlet, kg/hr

NR 463.25(3)(g) (g) Combined emission sources. To determine compliance with the PM or total metal HAP emission limits in s. NR 463.23 (1) (a) 1. to 6. when one or more regulated emissions sources are combined with either another regulated emissions source subject to a different emissions limit or other non-regulated emissions sources, you may demonstrate compliance using one of the following procedures:

NR 463.25(3)(g)1. 1. You shall meet the most stringent applicable emission limit for the regulated emission sources included in the combined emissions stream for the combined emissions stream.

NR 463.25(3)(g)2. 2. You shall do all of the following:

NR 463.25(3)(g)2.a. a. Determine the volumetric flow rate of the individual regulated streams for which emissions limits apply.

NR 463.25(3)(g)2.b. b. Calculate the flow-weighted average emissions limit, considering only the regulated streams, using Equation 3 in par. (e) 3., except Cw is the flow-weighted average emissions limit for PM or total metal HAP in the exhaust stream, gr/dscf; and Ci is the concentration of PM or total metal HAP in exhaust stream i, gr/dscf.

NR 463.25(3)(g)2.c. c. Meet the calculated flow-weighted average emissions limit for the regulated emissions sources included in the combined emissions stream for the combined emissions stream.

NR 463.25(3)(g)3. 3. You shall do all of the following:

NR 463.25(3)(g)3.a. a. Determine the PM or total metal HAP concentration of each of the regulated streams prior to the combination with other exhaust streams or control device.