California Code of Regulations
Title 8 - Industrial Relations
Division 1 - Department of Industrial Relations
Chapter 4 - Division of Industrial Safety
Subchapter 7 - General Industry Safety Orders
Group 18 - Explosive Materials
Article 114 - Storage of Explosive Materials
Section 5252 - Quantity and Distances Table for the Storage of Explosive Materials
Current through Register 2024 Notice Reg. No. 38, September 20, 2024
(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:
(c) All types of blasting caps in strength through No. 8 shall be rated at 1 1/2 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:
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.
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).
Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 12006, Health and Safety Code.
