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Caltrans using explosives to fracture massive boulders in Montecito

Caltrans crews are using explosive charges to fracture massive sandstone boulders in Montecito. Crews drill 1 ½ inch holes into the boulder and insert charges filled with ammonium nitrate and nitro methane. They then detonate the blast on the other end of a 250-foot long cable as they stand safely behind heavy equipment, vehicles or other barriers.
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