[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: 30CFR56.5002] [Page 267] TITLE 30--MINERAL RESOURCES CHAPTER I--MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR PART 56--SAFETY AND HEALTH STANDARDS--SURFACE METAL AND NONMETAL MINES--Table of Contents Subpart D--Air Quality and Physical Agents Sec. 56.5002 Exposure monitoring. Dust, gas, mist, and fume surveys shall be conducted as frequently as necessary to determine the adequacy of control measures.