[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: 30CFR33.34]

[Page 157-158]
 
                       TITLE 30--MINERAL RESOURCES
 
  CHAPTER I--MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR
 
PART 33--DUST COLLECTORS FOR USE IN CONNECTION WITH ROCK DRILLING IN COAL MINES--Table of Contents
 
                      Subpart C--Test Requirements
 
Sec. 33.34  Drilling test.

    (a) A drilling test shall consist of drilling a set of 10 test 
holes, without undue delay, under specified operating conditions. When 
the test involves the control of dust from more than one drill, all the 
drills shall be used in the intended manner to complete the set of test 
holes.
    (b) Holes shall be drilled to a depth of 4 feet plus or minus 2 
inches and shall be spaced so as not to interfere with adjacent holes. 
Each hole may be plugged after completion.

[[Page 158]]

    (c) Receptacles and filters for collecting drill cuttings shall be 
emptied and cleaned before each drilling test is started.
    (d) Holes designated as ``vertical'' shall be drilled to incline not 
more than 10 degrees to the vertical. Holes designated as ``angle'' 
shall be drilled to incline not less than 30 and not more than 45 
degrees to the vertical. Holes designated as ``horizontal'' shall be 
drilled to incline not more than 15 degrees to the horizontal.

[Sched. 25B, 25 FR 6473, July 9, 1960, as amended at 26 FR 2599, Mar. 
28, 1961]