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Copyrighted by SANTA CLARA COUNTY CODE & Municipal Code Corporation, 1998.

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Sec. B7-26. Spill control and secondary containment for hazardous materials in storage.

(a) Section 8003.1.3.2 of the Uniform Fire Code is amended to read as follows:

8003.1.3.2. Spill control for hazardous materials liquids. Rooms, buildings or areas used for the storage of hazardous materials liquids must be provided with spill control to prevent the flow of liquids to adjoining areas. Floors in indoor locations and similar surfaces in outdoor locations must 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, or

3. Sumps and collection systems.

Except for surfacing, the floors, sills, dikes, sumps and collection systems must be constructed of noncombustible material, and the liquid-tight seal must be compatible with the material stored. When liquid-tight sills or dikes are provided, they are not required at perimeter openings, which are provided with an open-grate trench across the opening that connects to an approved collection system.

(b) Section 8003.1.3.3 of the Uniform Fire Code is amended to read as follows:

8003.1.3.3. Secondary containment for hazardous materials liquids and solids. 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.

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; or

4. Drainage systems leading to an approved location.

Incompatible materials must be separated from each other in the secondary containment system.

Secondary containment for indoor storage areas must 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, for a period of 20 minutes.

Secondary containment for outdoor storage areas must be designed to contain a spill from the largest individual vessel. If the area is open to rainfall, secondary containment must be designed to include the volume of a 24-hour rainfall as determined by a 25-year storm and provisions must be made to drain accumulations of groundwater and rainwater.

A monitoring method must 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 must be provided. When monitoring devices are provided, they must be connected to distinct visual or audible alarms.

Drainage systems must be in accordance with the plumbing code and all of the following:

1. The slope of floors in indoor locations or similar areas in outdoor locations to drains must not be less than one percent;

2. Drains from indoor storage areas must 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 must 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 must be compatible with the materials stored;

5. Incompatible materials must be separated from each other in the drainage system; and

6. Drains must terminate in an approved location away from buildings, valves, means of egress, fire access roadways, adjoining property and storm drains.

(c) Table 8003.1-A of the Uniform Fire Code is deleted.

(Ord. No. NS-1100.89, § 1, 10-22-02)

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