[Code of Federal Regulations]

[Title 30, Volume 1]

[Revised as of July 1, 2006]

From the U.S. Government Printing Office via GPO Access

[CITE: 30CFR70.206]



[Page 433]

 

                       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 C_Sampling Procedures

 

Sec.  70.206  Approved sampling devices; equivalent concentrations.



    The concentration of respirable dust shall be determined by dividing 

the weight of dust in milligrams collected on the filter of an approved 

sampling device by the volume of air in cubic meters passing through the 

filter and then converting that concentration to an equivalent 

concentration as measured with an MRE instrument. To convert a 

concentration of respirable dust as measured with an approved sampling 

device to an equivalent concentration of respirable dust as measured 

with an MRE instrument, the concentration of respirable dust measured 

with the approved sampling device shall be multiplied by the constant 

factor prescribed by the Secretary for the approved sampling device 

used, and the product shall be the equivalent concentration as measured 

with an MRE instrument.