Ariz. Admin. Code § 18-2-721

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Current through Register Vol. 30, No. 25, June 21, 2024

Section R18-2-721 - Standards of Performance for Existing Nonferrous Metals Industry Sources

A. The provisions of this Section are applicable to the following affected facilities:

1. Mines,

2. Mills,

3. Concentrators,

4. Crusers,

5. Screens,

6. Material handling facilities,

7. Fine ore storage,

8. Dryers,

9. Roasters, and

10. Loaders.

B. No person shall cause, allow or permit the discharge of particulate matter into the atmosphere in any one hour from any process source subject to the provisions of this Section in total quantities in excess of the amounts calculated by one of the following equations:

1. For process sources having a process weight rate of 60,000 pounds per hour (30 tons per hour) or less, the maximum allowable emissions shall be determined by the following equation:

E = 4.10P^0.67

where:

E = the maximum allowable particulate emissions rate in pounds-mass per hour.

P = the process weight rate in tons-mass per hour.

2. For process sources having a process weight greater than 60,000 pounds per hour (30 tons per hour), the maximum allowable emissions shall be determined by the following equation:

E = 55.0P^0.11 -40

where "E" and "P" are defined as indicated in subsection (B)(1).

C. Actual values shall be calculated from the applicable equations and rounded off to two decimal places.

D. For purposes of this Section, the total process weight from all similar units employing a similar type process shall be used in determining the maximum allowable emission of particulate matter.

E. No person shall cause, allow or permit to be discharged into the atmosphere from any dryer or roaster the operating temperature of which exceeds 700°F, reduced sulfur in excess of 10% of the sulfur entering the process as feed. Reduced sulfur includes sulfur equivalent from all sulfur emissions including sulfur dioxide, sulfur trioxide, and sulfuric acid.

F. The owner or operator of any mining property subject to the provisions of this Section shall record the daily process rates and hours of operation of all material handling facilities.

G. A continuous monitoring system for measuring sulfur dioxide emissions shall be installed, calibrated, maintained and operated by the owner or operator where dryers or roasters are not expected to achieve compliance with the standard under subsection (E).

H. The test methods and procedures required by this Section are as follows:

1. The reference methods in 40 CFR 60, Appendix A, as incorporated by reference in Appendix 2 of this Chapter, shall be used to determine compliance with the standard prescribed in this Section as follows:

a. Method 5 for the concentration of particulate matter and the associated moisture content;

b. Method 1 for sample and velocity traverses;

c. Method 2 for velocity and volumetric flow rate;

d. Method 3 for gas analysis and calculation of excess air, using the integrated sample technique;

e. Method 6 for concentration of SO₂ .

2. For Method 5, Method 1 shall be used to select the sampling site and the number of traverse sampling points. The sampling time for each run shall be at least 60 minutes and the minimum sampling volume shall be 0.85 dscm (30 dscf), except that smaller sampling times or volumes, when necessitated by process variables or other factors, may be approved by the Director. The probe and filter holder heating systems in the sampling train shall be set to provide a gas temperature no greater than 160°C. (320°F.).

3. For Method 6, the sampling site shall be the same as that selected for Method 5. The sampling point in the duct shall be at the centroid of the cross section or at a point no closer to the walls than 1 m (3.28 ft.). For Method 6, the sample shall be extracted at a rate proportional to the gas velocity at the sampling point.

4. For Method 6, the minimum sampling time shall be 20 minutes and the minimum sampling volume 0.02 dscm (0.71 dscf) for each sample. The arithmetic mean of two samples shall constitute one run. Samples shall be taken at approximately 30-minute intervals.

Ariz. Admin. Code § R18-2-721

Section R18-2-721 renumbered from R18-2-521 effective November 15, 1993 (Supp. 93-4). Amended by final rulemaking at 15 A.A.R. 281, effective March 7, 2009 (Supp. 09-1).