OAR 340-230-0385: Municipal Waste Combustors, Small Municipal Waste Combustion Unit: Stack Testing

(1) Test Requirements. The owner or operator must conduct initial and annual stack tests to measure the emission levels of dioxins/furans, cadmium, lead, mercury, particulate matter, opacity, hydrogen chloride, and fugitive ash. (2) Use of stack test data. The owner or operator must use results of stack tests for dioxins/furans, cadmium, lead, mercury, particulate matter, opacity, hydrogen chloride, and fugitive ash to demonstrate compliance with the applicable emission limits in OAR 340-230-0380(1) and (2). To demonstrate compliance for carbon monoxide, nitrogen oxides, and sulfur dioxide, see 340-230-0383(2)(g). (3) Schedule. The owner or operator must: (a) Conduct initial stack tests for the pollutants listed in (1) of this rule by June 19, 2004. (b) Conduct annual stack tests for the same pollutants after the initial stack test. Conduct each annual stack test no later than 13 months after the previous stack test, and (c) Conduct each annual stack test no later than 13 months after the previous stack test. (4) Test methods. The owner or operator must: (a) Follow OAR 340-230-0383(10) to establish the sampling location and to determine pollutant concentrations, number of traverse points, individual test methods, and other specific testing requirements for the different pollutants. (b) Make sure that stack tests for all the pollutants consist of at least three test runs, as specified in 40 CFR 60.8. Use the average of the pollutant emission concentrations from the three test runs to determine compliance with the applicable emission limits in OAR 340-230-0380(1) and (2). (c) Use the average of the pollutant emission concentrations from the three test runs to determine compliance with the applicable emission limits in OAR 340-230-0380(1) and (2). (d) Obtain an oxygen (or carbon dioxide) measurement at the same time as the pollutant measurements to determine diluent gas levels, as specified in OAR 340-230-0383(2). (e) Use the equations in OAR 340-230-0383(8)(a) to calculate emission levels at 7 percent oxygen (or an equivalent carbon dioxide basis), the percent reduction in potential hydrogen chloride emissions, and the reduction efficiency for mercury emissions. See the individual test methods in 340-230-0383(3)(c) for other required equations. (f) The owner or operator may apply to the Department for approval under 40 CFR Part 60.8(b) to use a reference method with minor changes in methodology, use an equivalent method, use an alternative method the results of which the Department has determined are adequate for demonstrating compliance, waive the requirement for a performance test because the owner or operator has demonstrated by other means that they are in compliance, or use a shorter sampling time or smaller sampling volume. (5) Reduced testing frequency: (a) The owner or operator may test less often if it owns or operates a Class II municipal waste combustion unit and if all stack tests for a given pollutant over 3 consecutive years show that it complies with the emission limit. In that case, the owner or operator is not required to conduct a stack test for that pollutant for the next 2 years. However, another stack test must be conducted within 36 months of the anniversary date of the third consecutive stack test that shows compliance with the emission limit. Thereafter, stack tests must be performed every 3rd year but no later than 36 months following the previous stack tests. If a stack test shows noncompliance with an emission limit, annual stack tests for that pollutant must be conducted until all stack tests over 3 consecutive years show compliance with the emission limit for that pollutant. The provision applies to all pollutants subject to stack testing requirements: dioxins/furans, cadmium, lead, mercury, particulate matter, opacity, hydrogen chloride, and fugitive ash. (b) The owner or operator may test less often for dioxins/furans emissions, as described in paragraphs (A)–(C), if it owns or operates a municipal waste combustion plant that meets two conditions. First, the owner or operator must have multiple municipal waste combustion units onsite that are subject to this rule. Second, all those municipal waste combustion units have demonstrated levels of dioxins/furans emissions less than or equal to 15 nanograms per dry standard cubic meter (total mass) for Class I units, or 30 nanograms per dry standard cubic meter (total mass) for Class II units, for 2 consecutive years. In that case, the owner or operator may choose to conduct annual stack tests on only one municipal waste combustion unit per year at the plant. This provision applies only to stack testing for dioxins/furans emissions. (A) The owner or operator must conduct the stack test no more than 13 months following a stack test on any municipal waste combustion unit at the plant. Each year, the owner or operator must test a different municipal waste combustion unit subject to this rule and test all municipal waste combustion units subject to this rule in a sequence determined by the owner or operator. Once a testing sequence is determined, it must not be changed without the Department’s approval. (B) If each annual stack test shows levels of dioxins/furans emissions less than or equal to 15 nanograms per dry standard cubic meter (total mass) for Class I units, or 30 nanograms per dry standard cubic meter (total mass) for Class II units, the owner or operator may continue stack tests on only one municipal waste combustion unit per year. (C) If any annual stack test indicates levels of dioxins/furans emissions greater than 15 nanograms per dry standard cubic meter (total mass) for Class I units, or 30 nanograms per dry standard cubic meter (total mass) for Class II units, the owner or operator must conduct subsequent annual stack tests on all municipal waste combustion units subject to this subpart at the plant. The owner or operator may return to testing one municipal waste combustion unit per year if the owner or operator can demonstrate dioxins/furans emissions levels less than or equal to 15 nanograms per dry standard cubic meter (total mass) for Class I units, or 30 nanograms per dry standard cubic meter (total mass) for Class II units, for all municipal waste combustion units at the plant subject to this subpart for 2 consecutive years. (6) Alternative schedules. The owner or operator may not deviate from the 13-month testing schedules specified in OAR 340-230-0385(3)(b) and 340-230-0385(5)(b)(A) unless the owner or operator applies to the Department for an alternative schedule, and the Department approves the request for alternate scheduling before the date on which the owner or operator would otherwise have been required to conduct the next stack test.