Cal. Code Regs. tit. 8, § 5252 – Quantity and Distances Table for the Storage of Explosive Materials.

(a) The quantity of explosive materials that may be kept or stored in any magazine shall conform to Table EX-1, Table of Distances, which sets forth the minimum distance that a magazine may be located from the nearest inhabited building or other magazine.
(b) The quantity and distance table is not applicable to any magazine if the nearest inhabited building is effectually screened from the magazine by a natural barrier, which:
1. (1) Is 40 feet or more in height at any point, above a straight line drawn from the top of any sidewall of the magazine to any part of the inhabited building; and
2. (2) Has a natural thickness of not less than 200 feet at the point where it is intersected by the straight line.
(c) All types of blasting caps in strength through No. 8 shall be rated at 1 ½ pounds of explosives per 1,000 caps. For strengths higher than No. 8 cap, consult the manufacturer.
(d) For quantity and distance purposes detonating cord up to 60 grains per foot shall be calculated as equivalent to 9 pounds of high explosives per 1,000 feet. Heavier detonating cord shall be rated proportionately.
(e) When two or more storage magazines are located on the same property, each magazine must comply with the minimum distances specified from inhabited buildings, railways, and highways; and, in addition, they shall be separated from each other by not less than the distances shown for “Separation of Magazines,” except that the quantity of explosive materials contained in cap magazines shall govern in regard to the spacing of said cap magazines from magazines containing other explosive materials. If any two or more magazines are separated from each other by less than the specified “Separation of Magazines” distances, then such two or more magazines, as a group, must be considered as one magazine, and the total quantity of explosive materials stored in such group must be treated as if stored in a single magazine located on the side of any magazine of the group, and must comply with the minimum of distances specified from other magazines and inhabited buildings.
TABLE EX-1 AMERICAN TABLE OF DISTANCES FOR STORAGE OF EXPLOSIVES MATERIALS
As Revised and Approved by the Institute of Makers of Explosives--June 1991
TABLE EX-2
Table of Separation Distances of Ammonium Nitrate and Blasting Agents from Explosives or Blasting Agents⁽¹⁾
Donor Weight
Minimum Separation Distance of Acceptor when Barricaded (ft.)
Pounds Over
Pounds Not Over
Ammonium Nitrate⁽²⁾
Blasting Agent
Minimum Thickness of Artificial Barricades (in.)
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:
(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. Ammonium nitrate, ammonium nitrate-fuel oil or combinations thereof are acceptors. If stores of ammonium nitrate are located within the sympathetic detonation distances of explosives or blasting agents, one-half the mass of the ammonium nitrate should be included in the mass of the donor.
(2) 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 Fertilizer Institute, and ammonium nitrate failing to pass said test shall be stored at separation distances determined by competent persons.
TABLE EX-3 Types of Storage Facilities
Class of Explosive Materials Which May be Stored Therein
Storage Type
For Transportation (D.O.T.)
Old Classification
New Classification
Type 1
Division 1.1 Mass Explosion Hazard
Class A
High or Low Explosive
(Permanent)
Division 1.2 Projection Hazard
Class B
High or Low Explosive
Division 1.3 Predominantly Fire Hazard
Class C
High or Low Explosive
Division 1.4 No Significant Fire Hazard
Blasting Agent
Blasting Agent
Division 1.5 Blasting Agent
Type 2
Same as above
Same as above
Same as above
(Portable)
Type 3
Same as above
Same as above
Same as above
(“Day Box” for Temporary Storage)
Type 4
Division 1.3 Predominantly Fire Hazard
Class B
Low Explosive
Division 1.4 No Significant Fire Hazard
Class C
Low Explosive
Division 1.5 Blasting Agent
Blasting Agent
Blasting Agent
^*Electric Blasting Cap
Electric Blasting Cap
Electric Blasting Cap
Type 5
Division 1.5 Blasting Agent
Blasting Agent
Blasting Agent
* As a result of tests with electric blasting caps, it has been determined that these blasting caps are not subject to sympathetic detonation. Therefore, a Type 4 storage facility meets the necessary requirements for storage of blasting caps that do not mass detonate.

Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 12006, Health and Safety Code.

History

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 filed 9-18-80; effective thirtieth day thereafter (Register 80, No. 38).

4. Amendment of section heading, section and Note, including transfer of section 1938, App B, Plate B-14, table 1 to replace former Table EX-1; transfer of section 5253 Table EX-2 to new section 5252 Table EX-2; and transfer of section 1938, App B, Plate B-14a to new Table EX-3, filed 7-11-2003; operative 8-10-2003 (Register 2003, No. 28).