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(b) When the ammonium nitrate and/or blasting agent is not barricaded the distances shown in Table EX-2 in Section 5252 shall be multiplied by six. These distances allow for the possibility of high velocity metal fragments from mixers, hoppers, truck bodies, sheet metal structures, metal containers, and the like which may enclose the donor. Where storage is in bullet-resistant magazines recommended for explosives or where the storage is protected by a bullet-resistant wall, distances and barricade thicknesses in excess of those prescribed in Table EX-1 in Section 5252 and are not required. (See Section 5253.1 for bullet-resistant construction.)
(c) Earth, or sand dikes, or enclosures filled with the prescribed minimum thickness of earth or sand are acceptable artificial barricades. Natural barricades, such as hills or timber of sufficient density that the surrounding exposures which require protection cannot be seen from the donor when the trees are bare of leaves, are also acceptable.
(d) When the ammonium nitrate must be counted in determining the distances to be maintained from inhabited buildings, it shall be counted at l/2 its actual weight because its blast effect is lower.
Note: Ammonium nitrate by itself is relatively insensitive and is widely used through the State as an agricultural fertilizer. When used for blasting purposes, it is customary to sensitize the ammonium nitrate by mixing it with carbonaceous materials such as coal dust, lamp black, carbon black, wood pulp, diesel fuel, stove oil, or other materials containing carbon. When mixed with carbonaceous materials, ammonium nitrate becomes much more sensitive to fire, friction, and shock, so it takes on characteristics resembling those of dynamite. For this reason, a mixture of ammonium nitrate and carbonaceous material must be stored in compliance with regulations governing storage of explosives. Burning ammonium nitrate produces oxides of nitrogen which are very dangerous to breathe.
Authority cited: Section 142.3, Labor Code. Reference: Section 142.3 Labor Code.
1. Repealer and new section filed 10-17-75; effective thirtieth day thereafter (Register 75, No. 42).
2. Amendments filed 7-16-76; effective thirtieth day thereafter (Register 76, No. 29).
3. Amendment of subsections (a) and (d) filed 9-18-80; effective thirtieth day thereafter (Register 80, No. 38).
4. Amendment of section, including transfer of section 5253 Table EX-2 to new section 5252 Table EX-2, filed 7-11-2003; operative 8-10-2003 (Register 2003, No. 28).