Administrative Rules of Montana › Department 17 - ENVIRONMENTAL QUALITY › Chapter 17.8 - AIR QUALITY › Subchapter 17.8.15 - Compliance Assurance Monitoring › Rule 17.8.1504 - GENERAL CRITERIA FOR MONITORING DESIGN

Current through Register Vol. 13, July 5, 2024
(1) To provide a reasonable assurance of
				compliance with emission limitations or standards for the anticipated range of
				operations at a pollutant-specific emissions unit, monitoring under this
				subchapter shall meet the following general criteria:
(a) The owner or operator shall design the
				monitoring to obtain data for one or more indicators of emission control
				performance for the control device, any associated capture system and, if
				necessary to satisfy (1) (b) below, processes at a pollutant-specific emissions
				unit. Indicators of performance may include, but are not limited to, direct or
				predicted emissions (including visible emissions or opacity), process and
				control device parameters that affect control device (and capture system)
				efficiency or emission rates, or recorded findings of inspection and
				maintenance activities conducted by the owner or operator.
(b) The owner or operator shall establish an
				appropriate range(s) or designated condition(s) for the selected indicator(s)
				such that operation within the range(s) provide a reasonable assurance of
				ongoing compliance with emission limitations or standards for the anticipated
				range of operating conditions. Such range(s) or condition(s) shall reflect the
				proper operation and maintenance of the control device (and associated capture
				system), in accordance with applicable design properties, for minimizing
				emissions over the anticipated range of operating conditions at least to the
				level required to achieve compliance with the applicable requirements. The
				reasonable assurance of compliance will be assessed by maintaining performance
				within the indicator range(s) or designated condition(s). The range(s) shall be
				established in accordance with the design and performance requirements in this
				rule, ARM 17.8.1505 and
				17.8.1506, and documented in
				accordance with the requirements in
				17.8.1507 and
				17.8.1508. If necessary to assure
				that the control device and associated capture system can satisfy this
				criterion, the owner or operator shall monitor appropriate process operational
				parameters (such as total throughput where necessary to stay within the rated
				capacity for a control device). In addition, unless specifically stated
				otherwise by an applicable requirement, the owner or operator shall monitor
				indicators to detect any bypass of the control device (or capture system) to
				the atmosphere, if such bypass can occur based on the design of the
				pollutant-specific emissions unit.
(c) The design of indicator ranges or
				designated conditions may be:
(i) based on a
				single maximum or minimum value if appropriate (for example, maintaining
				condenser temperatures a certain number of degrees below the condensation
				temperature of the applicable compound(s) being processed) or at multiple
				levels that are relevant to distinctly different operating conditions (for
				example, high versus low load levels).
(ii) expressed as a function of process
				variables (for example, an indicator range expressed as minimum to maximum
				pressure drop across a venturi throat in a particulate control
				scrubber).
(iii) expressed as
				maintaining the applicable parameter in a particular operational status or
				designated condition (for example, position of a damper controlling gas flow to
				the atmosphere through a bypass duct).
(iv) established as interdependent between
				more than one indicator.