N.M. Code R. § 20.2.41.111 – Monitoring -- Existing or Modified Nonferrous Smelter

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.
[11/30/95; 20.2.41.111 NMAC - Rn, 20 NMAC 2.41.111 10/31/02]