LIS

Virginia Law

Administrative Code

Creating a Report: Check the sections you'd like to appear in the report, then use the "Create Report" button at the bottom of the page to generate your report. Once the report is generated you'll then have the option to download it as a pdf, print or email the report.

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
11/5/2024

4VAC25-90-70. Air quality.

A. During on-shift examinations required by § 45.2-827 of the Code of Virginia, a mine foreman authorized by the operator shall determine the concentration of carbon monoxide (CO) and nitrogen dioxide (NO2).

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

2. At a point inby 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:

Threshhold Limit Values (TLV)

Carbon Monoxide (CO)

25 ppm

Nitrogen Dioxide (NO2)

3 ppm

B. Samples of CO and NO2 shall be collected and analyzed:

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.

C. The results of these tests shall be:

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.

Statutory Authority

§ 45.2-103 of the Code of Virginia.

Historical Notes

Derived from Virginia Register Volume 17, Issue 20, eff. July 18, 2001; amended, Virginia Register Volume 38, Issue 13, eff. March 31, 2022.

Website addresses provided in the Virginia Administrative Code to documents incorporated by reference are for the reader's convenience only, may not necessarily be active or current, and should not be relied upon. To ensure the information incorporated by reference is accurate, the reader is encouraged to use the source document described in the regulation.

As a service to the public, the Virginia Administrative Code is provided online by the Virginia General Assembly. We are unable to answer legal questions or respond to requests for legal advice, including application of law to specific fact. To understand and protect your legal rights, you should consult an attorney.