Cal. Code Regs. tit. 19, § 1582
Donor Weight
Minimum Separation Distance of Receptor When Barricaded2(feet)
Minimum Thickness of Artificial
Pounds Over
Pounds Not Over
Ammonium Nitrate3
Blasting Agent4
Barricades5(inches)
100
3
11
12
100
300
4
14
12
300
600
5
18
12
600
1,000
6
22
12
1,000
1,600
7
25
12
1,600
2,000
8
29
12
2,000
3,000
9
32
15
3,000
4,000
10
36
15
4,000
6,000
11
40
15
6,000
8,000
12
43
20
8,000
10,000
13
47
20
10,000
12,000
14
50
20
12,000
16,000
15
54
25
16,000
20,000
16
58
25
20,000
25,000
18
65
25
25,000
30,000
19
68
30
30,000
35,000
20
72
30
35,000
40,000
21
76
30
40,000
45,000
22
79
35
45,000
50,000
23
83
35
50,000
55,000
24
86
35
55,000
60,000
25
90
35
60,000
70,000
26
94
40
70,000
80,000
28
101
40
80,000
90,000
30
108
40
90,000
100,000
32
115
40
100,000
120,000
34
122
50
120,000
140,000
37
133
50
140,000
160,000
40
144
50
160,000
180,000
44
158
50
180,000
200,000
48
173
50
200,000
220,000
52
187
60
220,000
250,000
56
202
60
250,000
275,000
60
216
60
275,000
300,000
64
230
60
Notes to Table of Separation Distances of Ammonium Nitrate and Blasting Agents from Explosives or Blasting Agents
Note:1--Separation distances to prevent explosion of ammonium nitrate and ammonium nitrate-based blasting agents by propagation from nearby stores of high explosives or blasting agents referred to in the Table as the “donor.” Ammonium nitrate, by itself, is not considered to be a donor when applying this Table. If stores of ammonium nitrate are located within the sympathetic detonation distance of explosives or blasting agents, one-half the mass of the ammonium nitrate should be included in the mass of the donor. 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.” These distances apply to the separation of stores only. The Table of Distances shall be used in determining separation distances from inhabited buildings, passenger railways and public highways.
Note:2--When the ammonium nitrate and/or blasting agent is not barricaded, the distances shown in the Table shall be multiplied by six. 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 the Table of Distances are not required.
Note:3--The distances in the Table apply to ammonium nitrate that passes the insensitivity test prescribed in the definition of ammonium nitrate fertilizer promulgated by the National Plant Food Institute; and ammonium nitrate failing to pass said test shall be stored at separation distances determined by competent persons and approved by the chief having jurisdiction.
Note:4--These distances apply to nitro-carbo-nitrates and blasting agents which pass the insensitivity test prescribed in the DOT regulations.
Note:5--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.
Note:6--When the ammonium nitrate must be counted in determining the distances to be maintained from the inhabited buildings, passenger railways and public highways, it may be counted at one-half its actual weight because its blast effect is lower.
Note:7--If any receptor and donor are separated from each other by less than the specified “Minimum Separation Distance of Receptor,” then such receptor and donor, as a group, must be considered as one magazine, and the total quantity of explosives and blasting agents stored in such group must be treated as if stored in a single magazine located on the site of any magazine of the group and must comply with the minimum distances specified from other magazines, inhabited buildings, railways and highways.
Note: Authority cited: Section 12081, Health and Safety Code.
1. New Article 19 (Section 1582) filed 3-4-69; effective thirtieth day thereafter (Register 69, No. 10).