Ariz. Admin. Code § 18-2-310

Current through Register Vol. 30, No. 45, November 8, 2024

Section R18-2-310 - Affirmative Defenses for Excess Emissions Due to Malfunctions, Startup, and Shutdown

A. Applicability.

This rule establishes affirmative defenses for certain emissions in excess of an emission standard or limitation and applies to all emission standards or limitations except for standards or limitations:

1. Promulgated pursuant to Sections 111 or 112 of the Act,

2. Promulgated pursuant to Titles IV or VI of the Clean Air Act,

3. Contained in any Prevention of Significant Deterioration (PSD) or New Source Review (NSR) permit issued by the U.S. E.P.A.,

4. Contained in R18-2-715(F), or

5. Included in a permit to meet the requirements of R18-2-406(A)(5).

B. Affirmative Defense for Malfunctions.

Emissions in excess of an applicable emission limitation due to malfunction shall constitute a violation. The owner or operator of a source with emissions in excess of an applicable emission limitation due to malfunction has an affirmative defense to a civil or administrative enforcement proceeding based on that violation, other than a judicial action seeking injunctive relief, if the owner or operator of the source has complied with the reporting requirements of R18-2-310.01 and has demonstrated all of the following:

1. The excess emissions resulted from a sudden and unavoidable breakdown of process equipment or air pollution control equipment beyond the reasonable control of the operator;

2. The air pollution control equipment, process equipment, or processes were at all times maintained and operated in a manner consistent with good practice for minimizing emissions;

3. If repairs were required, the repairs were made in an expeditious fashion when the applicable emission limitations were being exceeded. Off-shift labor and overtime were utilized where practicable to ensure that the repairs were made as expeditiously as possible. If off-shift labor and overtime were not utilized, the owner or operator satisfactorily demonstrated that the measures were impracticable;

4. The amount and duration of the excess emissions (including any bypass operation) were minimized to the maximum extent practicable during periods of such emissions;

5. All reasonable steps were taken to minimize the impact of the excess emissions on ambient air quality;

6. The excess emissions were not part of a recurring pattern indicative of inadequate design, operation, or maintenance;

7. During the period of excess emissions there were no exceedances of the relevant ambient air quality standards established in Article 2 of this Chapter that could be attributed to the emitting source;

8. The excess emissions did not stem from any activity or event that could have been foreseen and avoided, or planned, and could not have been avoided by better operations and maintenance practices;

9. All emissions monitoring systems were kept in operation if at all practicable; and

10. The owner or operator's actions in response to the excess emissions were documented by contemporaneous records.

C. Affirmative Defense for Startup and Shutdown.

1. Except as provided in subsection (C)(2), and unless otherwise provided for in the applicable requirement, emissions in excess of an applicable emission limitation due to startup and shutdown shall constitute a violation. The owner or operator of a source with emissions in excess of an applicable emission limitation due to startup and shutdown has an affirmative defense to a civil or administrative enforcement proceeding based on that violation, other than a judicial action seeking injunctive relief, if the owner or operator of the source has complied with the reporting requirements of R18-2-310.01 and has demonstrated all of the following:

a. The excess emissions could not have been prevented through careful and prudent planning and design;

b. If the excess emissions were the result of a bypass of control equipment, the bypass was unavoidable to prevent loss of life, personal injury, or severe damage to air pollution control equipment, production equipment, or other property;

c. The source's air pollution control equipment, process equipment, or processes were at all times maintained and operated in a manner consistent with good practice for minimizing emissions;

d. The amount and duration of the excess emissions (including any bypass operation) were minimized to the maximum extent practicable during periods of such emissions;

e. All reasonable steps were taken to minimize the impact of the excess emissions on ambient air quality;

f. During the period of excess emissions there were no exceedances of the relevant ambient air quality standards established in Article 2 of this Chapter that could be attributed to the emitting source;

g. All emissions monitoring systems were kept in operation if at all practicable; and

h. The owner or operator's actions in response to the excess emissions were documented by contemporaneous records.

2. If excess emissions occur due to a malfunction during routine startup and shutdown, then those instances shall be treated as other malfunctions subject to subsection (B).

D. Affirmative Defense for Malfunctions During Scheduled Maintenance.

If excess emissions occur due to a malfunction during scheduled maintenance, then those instances will be treated as other malfunctions subject to subsection (B).

E. Demonstration of Reasonable and Practicable Measures.

For an affirmative defense under subsection (B) or (C), the owner or operator of the source shall demonstrate, through submission of the data and information required by this Section and R18-2-310.01, that all reasonable and practicable measures within the owner or operator's control were implemented to prevent the occurrence of the excess emissions.

Ariz. Admin. Code § R18-2-310

Adopted effective May 14, 1979 (Supp. 79-1). Amended effective June 19, 1981 (Supp. 81-3). Amended Arizona Testing Manual for Air Pollutant Emissions, effective September 22, 1983 (Supp. 83-5). Amended Arizona Testing Manual for Air Pollutant Emissions, as of September 15, 1984, effective August 9, 1985 (Supp. 85-4). Amended effective September 28, 1984 (Supp. 84-5). Former Section R9-3-310 renumbered without change as R18-2-310 (Supp. 87-3). Amended effective February 26, 1988 (Supp. 88-1). Amended effective September 26, 1990 (Supp. 90-3). Section repealed, new Section adopted effective November 15, 1993 (Supp. 93-4). Section repealed; new Section adopted by final rulemaking at 7 A.A.R. 1164, effective February 15, 2001 (Supp. 01-1).