New Mexico Administrative Code › Title 20 - ENVIRONMENTAL PROTECTION › Chapter 2 - AIR QUALITY (STATEWIDE) › Part 41 - NONFERROUS SMELTERS - SULFUR › Section 20.2.41.111 - MONITORING - EXISTING OR MODIFIED NONFERROUS SMELTER

Current through Register Vol. 35, No. 13, July 16, 2024
A. Continuous Monitoring: The owner or
				operator of an existing or modified nonferrous smelter shall maintain monitors
				in good operating condition which continuously measure and record the sulfur
				dioxide concentration and stack gas volumetric flow rate of the gases within
				the stacks serving all furnaces, liquid sulfur dioxide plants, converters, acid
				plants, reverberatory feed dryers, and stacks from which captured fugitive
				emissions are vented to the atmosphere. Any continuous monitors required by
				this section (20.2.41.111 NMAC) shall record the sulfur dioxide concentration
				and stack gas volumetric flow rate at least 95 percent of the time for any
				twelve consecutive calendar months. The 95 percent data recovery shall only
				apply for the time or times that the stack is used to release sulfur dioxide to
				the atmosphere. If the monitor does not measure the sulfur dioxide
				concentration and stack gas volumetric flow rate for the required amount of
				time, the smelter owner shall use alternative methods approved by the
				Department and the US EPA to supply the missing concentration data.
B. Sampling Locations: The sampling point or
				points of the continuous monitoring system shall be located at least eight
				stack diameters (diameter measured at sampling point) downstream and two
				diameters upstream from any flow disturbance such as a bend, expansion,
				constriction or flame, unless another location is approved by the Department.
				The sampling point for monitoring emissions shall be in the duct at the
				centroid (geometrical centered l.0 per cent area) of the cross-section if the
				cross-sectional area is less than 113 square feet or at a point no closer to
				the wall than six feet if the cross-sectional area is more than 113 square feet
				unless otherwise approved by the Department. The sampling point shall be in an
				area of low spatial concentration gradient and shall be representative of the
				concentration in the duct.
C.
				Exemptions: Upon the request of the owner or operator of the smelter, the
				Department may exempt stacks from this monitoring requirement if the Department
				determines that they do not carry more than ten (10) pounds per hour sulfur
				dioxide emissions.
D. Instrument
				Calibration and Data Retention: Instruments and sampling systems installed and
				used pursuant to this section shall be calibrated in accordance with the
				methods prescribed by manufacturer's recommended zero adjustment and
				calibration check procedures at least once every 24 hours of operation, unless
				the manufacturer specifies or recommends calibration checks more frequently.
				The owner or operator of the smelter shall retain all raw data and quality
				assurance measurements and procedures for a minimum of three years.
E. Performance Audits of Monitoring System:
				Instruments and sampling systems installed and used pursuant to subsections A,
				B and C of 20.2.41.111 NMAC, shall be installed, operated and maintained in
				accordance with the performance specifications and other requirements set forth
				at 40 CFR Part 52, Appendices D and E. Alternative procedures for this
				paragraph may be used with approval of the Department and the EPA. In the event
				that repair work is performed on the monitoring system, that could result in
				inaccurate readings, the owner or operator of the smelter shall demonstrate to
				the Department that the system continues to meet the applicable performance
				specifications. The Department may require the owner or operator of the smelter
				to conduct performance tests as specified at 40 CFR Part 52, Appendices D and E
				at any time that the Department determines that such a test is necessary to
				verify the performance of the monitoring system. The Department and the US EPA
				may approve alternative means of verifying the performance of the continuous
				monitoring system. The Department may also perform independent audits on the
				continuous monitoring system, utilizing Methods l, 2, 4 and 8, found at 40 CFR
				Part 60, Appendix A, or other applicable methods.
F. Test Notification, Reporting and
				Reevaluation of CEMS: The owner or operator of an existing or modified
				nonferrous smelter shall:
(1) Notify the
				Department at least forty-five (45) days in advance of the start of the field
				tests required at 40 CFR Part 52, Appendices D and E;
(2) Submit a report to the Department within
				forty-five (45) days of the completion of any performance specification test
				required by this Part or the Department; and
(3) Reevaluate the continuous emission
				monitoring systems installed and operated pursuant to subsection E of
				20.2.41.111 NMAC at least once during any twelve (12) calendar months following
				the installation of such systems. The evaluation shall demonstrate
				acceptability of zero and calibration drift, relative accuracy error, and
				calibration error of measurements contained in the applicable performance
				specification at 40 CFR Part 52, Appendices D and E, or as otherwise approved
				by the Department.