height that a straight line from the top of any sidewall of the building containing explosives to the eave line
of any magazine or building, or to a point 12 feet (3.66 m) above the center of a railway or highway, will
pass through such intervening or artificial barricade.
Note c. "Artificial barricade" means an artificial mound or revetted wall of earth of a minimum
thickness of 3 feet (0.92 m).
Note d. "Natural barricade" means natural features of the ground, such as hills or timber of sufficient
density that the surrounding exposures which require protection cannot be seen from the magazine when
the trees are bare of leaves.
Note e. When a building containing explosives is not barricaded, the distances shown in Table 1 shall
be doubled.
Note f. When 2 or more storage magazines are located on the same property, each magazine shall
comply with minimum distances specified from inhabited buildings, railways, and highways, and, in
addition, they shall be separated from each other by not less than the distances shown for "Separation of
magazines," except that the quantity of explosives contained in cap magazines shall govern in regard to the
spacing of the cap magazines from magazines containing other explosives. If any 2 or more magazines are
separated from each other by less than the specified "Separation of magazines" distances, then such 2 or
more magazines, as a group, shall be considered as 1 magazine, and the total quantity of explosives stored
in such group shall be treated as if stored in a single magazine located on the site of any magazine of the
group and shall comply with the distances specified from other magazines, inhabited buildings, railways,
and highways.
Note g. This table applies only to the manufacture and permanent storage of commercial explosives. It
is not applicable to the transportation of explosives or any handling or temporary storage necessary or
incident thereto. It is not intended to apply to bombs, projectiles, or other heavily encased explosives.
Note h. 1 pound = 0.454 kg; 1 foot = 0.305 m.
(5) A minor shall not be employed in any occupation involving the use of or exposure
to hazardous substances, as defined in R 408.6204(a).
(6) A minor shall not be employed to work in any workroom in which any of the
following occurs:
(a) Radium is stored or used in the manufacture of self-luminous compounds.
(b) A self-luminous compound, as defined in R 408.6205(h), is made, processed,
packaged, stored, used, or worked on.
(c) Incandescent mantles made from fabric and solutions containing thorium salts are
manufactured, processed, or packaged.
(d) Other radioactive substances are present in the air in average concentrations
exceeding 10% of the maximum permissible concentrations in the air recommended for
occupational exposure as set forth in the 40-hour week column of table 1 of the national
committee on radiation protection report no. 22, entitled "Maximum Permissible Body
Burdens and Maximum Permissible Concentrations of Radionuclides in Air and in Water
for Occupational Exposure," June 5, 1959, which is adopted by reference in these rules
and is available for inspection and for distribution at no charge at the Michigan
Department of Education, Office of Career and Technical Education, 608 W. Allegan
Street, P.O. Box 30712, Lansing, MI 48909.
This report may be purchased from the National Council on Radiation Protection
and Measurements, 7910 Woodmont Avenue, Suite 400, Bethesda, MD 20814-3095, at a
cost of $20.00.
(7) A minor shall not be employed in any occupation which requires the use of
respiratory equipment, as defined in R 408.6205(g).
(8) A minor under 16 years of age shall not be employed in any occupation involving
work in a confined space, as defined in R 408.6203(c).
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