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(b) Provisions shall be made for warning crews when an electric or dust storm approaches.
(c) In underground operations using electrical blasting systems, instrumentation to determine the presence of a lightning and dust storm within 15 miles of the portal and means to signal the heading shall be provided.
Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code.
1. Amendment of section heading and section and new Note filed 7-11-2003; operative 8-10-2003 (Register 2003, No. 28).
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