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40" <br /> DANGER <br /> BLASTING AREA <br /> BLAST WARNING SIGNALS <br /> PRIOR TO BLAST <br /> 5 LONG SIREN SIGNALS AT 5 MINUTES <br /> 20 SHORT SIREN SIGNALS AT 3 MINUTES 28 " <br /> STEADY ELECTRIC SIREN AT 2 MINUTES <br /> TONE CHANGE ELECTRIC SIREN AT 30 SECONDS <br /> ALL CLEAR <br /> ONE LONG SIREN SIGNAL OF 20 SECONDS DURATION <br /> AFTER INSPECTION OF BLAST AREA <br /> OBEY THE BLAST ZONE GUARDS INSTRUCTIONS <br /> AT ALL TIMES <br /> WARNING ! 7" <br /> EXPLOSIVES IN USE <br /> POSTED AT ALL PUBLIC ACCESSES <br /> 20 30" <br /> KEEP OUT <br /> BLASTING 14 STOP <br /> - AREA - BLASTING <br /> AREA <br /> POSTED ON ALL MINE ROADS <br /> . WITHIN 50' OF BLASTING AREA <br /> FIGURE 3. 1-2 BLASTING SIGNS <br /> 3-5 <br /> REVISED FEB I V87 <br />