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
Section 4VAC25-90-70 - Air quality

1. In the return of each working section where diesel equipment is used in by the loading point at a location which represents the contribution of all diesel equipment on such section.

2. At a point in by the last piece of diesel equipment on a longwall or shortwall when mining equipment is being installed or removed. This examination shall be made at a time which represents the contribution of all diesel equipment used for this activity including the diesel equipment used to transport longwall or shortwall equipment to and from the section.

3. In any other area designated by the chief where diesel equipment is operated in a manner which can result in significant concentrations of diesel exhaust emissions.

4. The concentrations of carbon monoxide (CO) and nitrogen dioxide (NO2) shall not exceed the following threshold limit values:

1. By appropriate instrumentation that has been maintained and calibrated in accordance with the manufacturer's recommendations;

2. In a manner that makes the results available immediately to the person collecting the samples; and

3. During periods that are representative of conditions during normal operations.

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

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