[Code of Federal Regulations]
[Title 30, Volume 1]
[Revised as of July 1, 2002]
From the U.S. Government Printing Office via GPO Access
[CITE: 30CFR70.1900]

[Page 427-428]
 
                       TITLE 30--MINERAL RESOURCES
 
  CHAPTER I--MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR
 
PART 70--MANDATORY HEALTH STANDARDS--UNDERGROUND COAL MINES--Table of Contents
 
                SUBPART T--DIESEL EXHAUST GAS MONITORING
 
Sec. 70.1900  Exhaust Gas Monitoring.


    (a) During on-shift examinations required by Sec. 75.362, a 
certified person as defined by Sec. 75.100 of this chapter and 
designated by the operator as trained or experienced in the appropriate 
sampling procedures, 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, at a location which represents the contribution of all diesel 
equipment on such section;
    (2) In the area of the section loading point if diesel haulage 
equipment is operated on the working section;
    (3) At a point inby the last piece of diesel equipment on the 
longwall or shortwall face when mining equipment is being installed or 
removed; and
    (4) In any other area designated by the district manager as 
specified in the mine operator's approved ventilation plan where diesel 
equipment is operated in a manner which can result in significant 
concentrations of diesel exhaust.
    (b) Samples of CO and NO2 shall be--
    (1) Collected in a manner that makes the results available 
immediately to the person collecting the samples;
    (2) Collected and analyzed by appropriate instrumentation which has 
been maintained and calibrated in accordance with the manufacturer's 
recommendations; and
    (3) Collected during periods that are representative of conditions 
during normal operations.
    (c) Except as provided in Sec. 75.325(j) of this chapter, when 
sampling results indicate a concentration of CO and/or NO2 
exceeding an action level of 50 percent of the threshold limit values 
(TLV[reg]) adopted by the American Conference of Governmental Industrial 
Hygienists, the mine operator shall immediately take appropriate 
corrective action to reduce the concentrations of CO and/or 
NO2 to below the applicable action level. The publication, 
``Threshold Limit Values for Substance in Workroom Air'' (1972) is 
incorporated by reference and may be inspected at MSHA's Office of 
Standards, Regulations, and Variances, 1100 Wilson Blvd., Room 2352, 
Arlington, Virginia 22209-3939; at any Coal Mine Health and Safety 
District and Subdistrict Office; and at the Office of the Federal 
Register, 800 North Capitol Street, NW Suite 700, Washington, DC. This 
incorporation by reference was approved by the Director of the Federal 
Register in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. In 
addition, copies of the document may be purchased from the Secretary-
Treasurer, American Conference of Governmental Industrial Hygienists, 
Post Office Box 1937, Cincinnati, OH 45202.
    (d) A record shall be made when sampling results exceed the action 
level for the applicable TLV[reg] for CO and/or 
NO2. The record shall be made as part of and in the same 
manner as the records for hazards required by Sec. 75.363 of this 
chapter and include the following:
    (1) Location where each sample was collected;
    (2) Substance sampled and the measured concentration; and

[[Page 428]]

    (3) Corrective action taken to reduce the concentration of CO and/or 
NO2 to or below the applicable action level.
    (e) As of November 25, 1997 exhaust gas monitoring shall be 
conducted in accordance with the requirements of this section.

[61 FR 55526, Oct. 25, 1996, as amended at 67 FR 38385, June 4, 2002]