(1) Blasting and Use of Explosives:
(a) Smoking, firearms, matches, open flame
lamps, fires and flame or spark producing devices shall be prohibited in any
explosive magazine or within a radius of 100 feet thereof, and with 100 feet of
where explosives are being handled, transported, or used;
(b) All blasts shall be fired electronically
with an electric blasting machine or properly designed electric power sources,
except as provided in sections of this rule;
(c) All explosives shall be accounted for at
all times. Explosives not being used shall be kept in a locked magazine,
unavailable to persons not authorized to handle them. The employer shall
maintain an inventory and use records of all explosives. Appropriate
authorities shall be notified of any loss, theft, or unauthorized entry into a
magazine;
(d) The preparation of
primers shall be done in a safe place, well away from fire, possible sparks,
magazines or powder boxes. Where practical to do so, primers should be prepared
at the point of use and immediately placed in the bore hole.
(2) Recordkeeping and Loading:
(a) The blaster shall keep an accurate,
up-to-date records of explosives, blasting agents, and blasting supplies used
in a blast and shall keep an accurate running inventory of all explosives and
blasting agents stored on the operations;
(b) No explosives or blasting agents shall be
left unattended at the blast site. No loaded holes shall be left unattended or
unprotected. All loaded holes shall be fired before leaving the blast
site.
(3) Electric
Firing. Flashlight batteries shall not be used when firing a circuit of
electric blasting caps. The electric current delivered to the charge shall meet
the manufacturer's recommended level.
(4) Locks. Each door shall be equipped with
two mortise locks; with two padlocks fastened in separate hasps and staples;
with a combination or mortise lock and padlock; with a mortise lock that
requires two keys to open; or a three-point lock. Locks shall be five-tumbler
proof. All padlocks shall be protected with 1/4-inch steel caps constructed so
as to prevent sawing or lever action on the locks or hasps.
(5) Cap Boxes. Storage facilities for
blasting caps in quantities of 100 or less shall have sides, bottoms, and
covers constructed of No. 12-gauge metal and lined with a nonsparking material.
Hinges and hasps shall be attached thereto by welding. A single five-tumbler
proof lock shall be sufficient for locking purposes.
NOTES:
-1- Use the American Table of Distances for Storage of
Explosive Materials to determine safe distances from inhabited dwellings,
highways, passenger railways, and between explosive materials magazines.
-2- Use the appendix, Separation Distances of Ammonium Nitrate
and Blasting Agents from Explosives or Blasting Agents, to determine
non-propagating distances to ammonium nitrate fuel oil (ANFO) blasting agents
and to ammonium nitrate.
-3- Use the greater of the distances shown in the American
Table of Distances and in the Table of Recommended Separation Distances to
determine the required separation between a magazine for storage of explosives
and a magazine for storage of blasting agents.
(6)
(a)
Table of Distances. The provisions contained in Table 21 are in lieu of the
provisions contained in 29
CFR
1910.109, Table H-21, American Table of
Distances for Storage of Explosives. Related Notes are printed following the
table for clarity in using Table OR-H-21;
(b) Table of Recommended Separation
Distances. The provisions contained in Table 22 are in lieu of the provisions
contained in 29 CFR
1910.109, Table H-22, Table of Recommended
Separation Distances of Ammonium Nitrate and Blasting Agents from Explosives or
Blasting Agents. Related notes are printed following the table for clarity in
using Table OR-H-22.
