Testing must be done in accordance with the provisions of chapter 33.1-15-12, as applicable. The reference methods in appendix A to chapter 33.1-15-12, its replacement or applicable alternative methods as approved by the department, shall be used to determine compliance with this chapter as follows:

1. Method 1 for selection of sampling site and sample traverses.

2. Method 2 for stack gas velocity and volumetric flow rate.

3. Method 3 for gas analysis.

4. Method 4 for moisture content.

5. Method 6, 6A, 6C, and 20, as applicable, for concentration of sulfur dioxide. The minimum sampling time shall be at least sixty minutes per run and a test must consist of three runs.

For each run using method 6 for fuel burning equipment the emissions expressed in pounds per million British thermal units [nanogram per joule] shall be determined by the following procedures:

$$E = CF_d \left( \frac{20.9}{20.9 - \%O_2} \right) \quad \text{or} \quad E = CF_c \left( \frac{100}{\%CO_2} \right)$$

where:

(1) E = pollutant emission, lb/million Btu [ng/l]. (2) C = pollutant concentrations, lb/dscf [ng/dscm]. (3) %O₂ = oxygen content by volume, dry basis. (4) %CO₂ = carbon dioxide content by volume, dry basis.

The percent oxygen and percent carbon dioxide shall be determined by using the integrated sampling and analysis procedures of method 3.

(5) $F_d$ and $F_c$ = factors listed in method 19 of appendix A of chapter 33.1-15-12.

For facilities firing combinations of fuels the $F_d$ or $F_c$ factors designated in this section shall be prorated in accordance with the applicable formula as follows:

$$F_d = \sum_i=1^n x_i (F_d)_i \quad \text{or} \quad F_c = \sum_i=1^n x_i (F_c)_i$$

where:

$x_i$ = the fraction of total heat input derived from each type of fuel.

$(F_d)_i$ or $(F_c)_i$ = the applicable $F_d$ or $F_c$ factor for each fuel type.

$n$ = the number of fuels being burned in combination.

History: Effective January 1, 2019.

General Authority: NDCC 23.1-06-04; S.L. 2017, ch. 199, § 1

Law Implemented: NDCC 23.1-06-04; S.L. 2017, ch. 199, § 21