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(1) If a continuous emission monitoring system (CEMS) , continuous opacity monitoring system (COMS) or predictive emission monitoring system (PEMS) is required pursuant to other authority under the FCAA or state or local law, the owner or operator shall use such system to satisfy the requirements of this subchapter.

(2) The use of a CEMS, COMS, or PEMS that satisfies any of the following monitoring requirements shall be deemed to satisfy the general design criteria in ARM 17.8.1504 and 17.8.1505, provided that a COMS may be subject to the criteria for establishing indicator ranges under ARM 17.8.1504:

(a) 40 CFR part 51.214 and appendix P of 40 CFR part 51;

(b) 40 CFR part 60.13 and appendix B of 40 CFR part 60;

(c) 40 CFR part 63.8 and any applicable performance specifications required pursuant to the applicable subpart of 40 CFR part 63;

(d) 40 CFR part 75;

(e) subpart H and appendix IX of 40 CFR part 266; or

(f) If an applicable requirement does not otherwise require compliance with the requirements listed in (2) (a) through (e) above, comparable requirements and specifications established by the department.

(3) The owner or operator shall design the monitoring system subject to this rule to:

(a) allow for reporting of exceedances (or excursions if applicable to a COMS used to assure compliance with a particulate matter standard) consistent with any period for reporting of exceedances in an underlying requirement. If an underlying requirement does not contain a provision for establishing an averaging period for the reporting of exceedances or excursions, the criteria used to develop an averaging period in ARM 17.8.1505(1) (d) shall apply; and

(b) provide an indicator range consistent with ARM 17.8.1504 for a COMS used to assure compliance with a particulate matter standard. If an opacity standard applies to the pollutant-specific emissions unit, such limit may be used as the appropriate indicator range unless the opacity limit fails to meet the criteria in ARM 17.8.1504 after considering the type of control device and other site-specific factors applicable to the pollutant-specific emissions unit.

History: 75-2-217, 75-2-218, MCA; IMP, 75-2-217, 75-2-218, MCA; NEW, 2000 MAR p. 839, Eff. 3/31/00.

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