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Rooms, buildings or areas used for the storage of liquid or solid hazardous materials shall be provided with spill control and secondary containment in accordance with Sections 5004.2.1 through 5004.2.3.
Exception: Outdoor storage of containers on approved containment pallets in accordance with Section 5004.2.3.
5004.2.1 Spill Control for Hazardous Material Liquids
Rooms, buildings or areas used for the storage of hazardous material liquids in individual vessels having a capacity of more than 55 gallons (208 L), or in which the aggregate capacity of multiple vessels exceeds 1,000 gallons (3785 L), shall be provided with spill control to prevent the flow of liquids to adjoining areas. Floors in indoor locations and similar surfaces in outdoor locations shall be constructed to contain a spill from the largest single vessel by one of the following methods:
  1. Liquid-tight sloped or recessed floors in indoor locations or similar areas in outdoor locations.
  2. Liquid-tight floors in indoor locations or similar areas in outdoor locations provided with liquid-tight raised or recessed sills or dikes.
  3. Sumps and collection systems.
  4. Other approved engineered systems.
Except for surfacing, the floors, sills, dikes, sumps and collection systems shall be constructed of noncombustible material, and the liquid-tight seal shall be compatible with the material stored. Where liquid-tight sills or dikes are provided, they are not required at perimeter openings having an open-grate trench across the opening that connects to an approved collection system.
5004.2.2 Secondary Containment for Hazardous Material Liquids and Solids
Where required by Table 5004.2.2, buildings, rooms or areas used for the storage of hazardous materials liquids or solids shall be provided with secondary containment in accordance with this section where the capacity of an individual vessel or the aggregate capacity of multiple vessels exceeds both of the following:
  1. Liquids: Capacity of an individual vessel exceeds 55 gallons (208 L) or the aggregate capacity of multiple vessels exceeds 1,000 gallons (3785 L).
  2. Solids: Capacity of an individual vessel exceeds 550 pounds (250 kg) or the aggregate capacity of multiple vessels exceeds 10,000 pounds (4540 kg).
REQUIRED SECONDARY CONTAINMENT—HAZARDOUS MATERIAL SOLIDS AND LIQUIDS STORAGE
MATERIAL INDOOR STORAGE OUTDOOR STORAGE
Solids Liquids Solids Liquids
1. Physical-hazard materials
Combustible liquids Class II Not Applicable See Chapter 57 Not Applicable See Chapter 57
Class IIIA See Chapter 57 See Chapter 57
Class IIIB See Chapter 57 See Chapter 57
Cryogenic fluids See Chapter 55 See Chapter 55
Explosives See Chapter 56 See Chapter 56
Flammable liquids Class IA Not Applicable See Chapter 57 Not Applicable See Chapter 57
Class IB See Chapter 57 See Chapter 57
Class IC See Chapter 57 See Chapter 57
Flammable solids Not Required Not Applicable Not Required Not Applicable
Organic peroxides Unclassified Detonable Required Required Not Required Not Required
Class I
Class II
Class III
Class IV
Class V Not Required Not Required Not Required Not Required
Oxidizers Class 4 Required Required Not Required Not Required
Class 3
Class 2
Class 1 Not Required Not Required Not Required Not Required
Pyrophorics Not Required Required Not Required Required
Unstable (reactives) Class 4 Required Required Required Required
Class 3
Class 2
Class 1 Not Required Not Required Not Required Not Required
Water reactives Class 3 Required Required Required Required
Class 2
Class 1 Not Required Not Required Not Required Not Required
2. Health-hazard materials
Corrosives Not Required Required Not Required Required
Highly toxics Required Required Required Required
Toxics
5004.2.2.1 Containment and Drainage Methods
The building, room or area shall contain or drain the hazardous materials and fire protection water through the use of one of the following methods:
  1. Liquid-tight sloped or recessed floors in indoor locations or similar areas in outdoor locations.
  2. Liquid-tight floors in indoor locations or similar areas in outdoor locations provided with liquid-tight raised or recessed sills or dikes.
  3. Sumps and collection systems.
  4. Drainage systems leading to an approved location.
  5. Other approved engineered systems.
5004.2.2.2 Incompatible Materials
Incompatible materials used in open systems shall be separated from each other in the secondary containment system.
5004.2.2.3 Indoor Design
Secondary containment for indoor storage areas shall be designed to contain a spill from the largest vessel plus the design flow volume of fire protection water calculated to discharge from the fire-extinguishing system over the minimum required system design area or area of the room or area in which the storage is located, whichever is smaller. The containment capacity shall be designed to contain the flow for a period of 20 minutes.
5004.2.2.4 Outdoor Design
Secondary containment for outdoor storage areas shall be designed to contain a spill from the largest individual vessel. If the area is open to rainfall, secondary containment shall be designed to include the volume of a 24-hour rainfall as determined by a 25-year storm and provisions shall be made to drain accumulations of groundwater and rainwater.
5004.2.2.5 Monitoring
An approved monitoring method shall be provided to detect hazardous materials in the secondary containment system. The monitoring method is allowed to be visual inspection of the primary or secondary containment, or other approved means. Where secondary containment is subject to the intrusion of water, a monitoring method for detecting water shall be provided. Where monitoring devices are provided, they shall be connected to approved visual or audible alarms.
5004.2.2.6 Drainage System Design
Drainage systems shall be in accordance with the International Plumbing Code and all of the following:
  1. The slope of floors to drains in indoor locations, or similar areas in outdoor locations shall be not less than 1 percent.
  2. Drains from indoor storage areas shall be sized to carry the volume of the fire protection water as determined by the design density discharged from the automatic fire-extinguishing system over the minimum required system design area or area of the room or area in which the storage is located, whichever is smaller.
  3. Drains from outdoor storage areas shall be sized to carry the volume of the fire flow and the volume of a 24-hour rainfall as determined by a 25-year storm.
  4. Materials of construction for drainage systems shall be compatible with the materials stored.
  5. Incompatible materials used in open systems shall be separated from each other in the drainage system.
  6. Drains shall terminate in an approved location away from buildings, valves, means of egress, fire access roadways, adjoining property and storm drains.
5004.2.3 Containment Pallets
Where used as an alternative to spill control and secondary containment for outdoor storage in accordance with the exception in Section 5004.2, containment pallets shall comply with all of the following:
  1. A liquid-tight sump with access for visual inspection shall be provided.
  2. The sump shall be designed to contain not less than 66 gallons (250 L).
  3. Exposed surfaces shall be compatible with material stored.
  4. Containment pallets shall be protected to prevent collection of rainwater within the sump.

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