5 Colo. Code Regs. § 1001-14-VI
Current through Register Vol. 47, No. 24, December 25, 2024
Section 5 CCR 1001-14-VI - Carbon Monoxide Standard within the Eisenhower Tunnel* (State Only)Pursuant to the authority of § 25-7-106 (1), (b) and (c) and of 25-7-107 (1), (a), and (b) of Colorado Revised Statutes 1973, the Colorado Air Quality Control Commission designated and confines of any traveled portions of the roadways within the Eisenhower Tunnel as a control area in which the adoption and maintenance of an ambient air standard is deemed necessary with particular identification of "carbon monoxide" as the pollutant hereby made subject to the following standard to maintain an acceptable human carboxyhemoglobin level: the ambient air within the Eisenhower Tunnel shall be maintained so that the levels of carbon monoxide shall not exceed a 15 minute average of 100 parts per million volume (115 milligrams per cubic meter at 760 Torr and 25 degrees Celsius) concentration.
* Carbon Monoxide/Eisenhower Tunnel: Adopted: 9/5/75; Effective: 12/17/75
Method of Testing:
1. For the purpose of this regulation, primary determinations of CO shall be made by use of instrumentation based on non-dispersive infrared spectrophotometry (NDIR), as specified in Federal Register, 36 (84), 8194-8195 (30 April, 1971), Appendix C. Other methods equivalent, in accuracy, precision, and freedom from interferences may be used if approved in advance by the Air Pollution Control Division.2. Routine monitoring of CO may be performed by instruments based on other principles, provided that such instruments are demonstrated to yield results equivalent to measurements by NDIR methods, within the limits of accuracy and precision approved in advance by the Air Pollution Control Division.3. Instruments used for primary determinations and routine monitoring shall be maintained to at least the minimum standards recommended by their manufacturers. Calibrations shall be made at the location of use according to the procedures set out in "Guidelines for Development of a Quality Assurance Program: Reference Method for the "Continuous Measurement of Carbon Monoxide in the Atmosphere", EPA-R4-028A, June 1973, pp. 8-20.4. Records of maintenance and calibrations of all instruments shall be kept in a current, timely manner. The sources and identifications of gas mixtures used in calibrations shall be entered in records of calibration. These records of calibration and summaries of operating CO levels shall be made available within 30 days after the end of the calendar quarter to the Air Pollution Control Division for review.39 CR 24, December 25, 2016, effective 1/14/201744 CR 02, January 25, 2021, effective 2/14/202146 CR 02, January 25, 2022, effective 2/14/202347 CR 02, January 25, 2024, effective 2/14/202447 CR 17, September 10, 2024, effective 10/15/2024