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Virginia Administrative Code
Title 4. Conservation And Natural Resources
Agency 25. Department of Energy
Chapter 90. Regulations Governing the Use of Diesel-Powered Equipment in Underground Coal Mines
11/21/2024

4VAC25-90-60. Emission testing and evaluation.

Undiluted exhaust emissions of diesel engines, to include each side of a dual exhaust system, on diesel-powered equipment used in underground coal mines shall be tested and evaluated weekly by an authorized person. The mine operator shall develop and implement effective written procedures for such testing and evaluation that shall include the following:

1. The method for which a repeatable load test is conducted that must include an engine RPM reading;

2. Sampling and analytical methods used to measure diesel engine emission concentrations;

3. Instrumentation and calibration of instrumentation capable of accurately detecting carbon monoxide in the expected concentrations;

4. The method of evaluation and interpretation of sampling results;

5. The operator will establish a baseline level of diesel exhaust emissions, subject to approval by the chief based upon the average of the first four undiluted exhaust emission tests required by this section. This procedure will establish an action level not to exceed the lesser of two times the baseline or 2500 parts per million (ppm) of carbon monoxide. Should the action level be exceeded, the machine shall be removed from service and engine performance improved.

6. The maintenance of records necessary to track engine performance. These records shall be:

a. Recorded in a secure book that is not susceptible to alteration, or recorded electronically in a computer system that is secure and not susceptible to alteration; and

b. Retained at a surface location at the mine for at least one year and made available for inspection by interested persons.

Statutory Authority

§§ 45.1-161.3, 45.1-161.106, and 45.1-161.206 of the Code of Virginia.

Historical Notes

Derived from Virginia Register Volume 17, Issue 20, eff. July 18, 2001; amended, Volume 28, Issue 20, eff. July 19, 2012.

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