Santa Clara County Municipal Code Art. 3 Hazard

Sec. B11-370. - General.¶

Regulated materials will be classified as Class I, Class II, Class III or Min. TQ materials as defined in B11-362.

(a) The specified provisions required by this chapter are in addition to those requirements specified in the fire code. Requirements for controls for the use or indoor storage of regulated materials will be cumulative as the hazard class of regulated material increases in accordance with the following table:

_____

HAZARD CLASSIFICATIONS AND CONTROLS

Hazard Classification	Hazard Controls
Class I	Includes Division II, Class I, Class II, Class III, minimum threshold quantity and exempt amount controls
Class II	Includes Division II, Class II, Class III, minimum threshold quantity and exempt amount controls
Class III	Includes Division II, Class III, minimum threshold quantity and exempt amount controls
Minimum Threshold Quantity	Includes Division II, minimum threshold quantity and exempt amount controls
Exempt Amounts	Other applicable statutes, codes and ordinances

_____

(b) All control equipment for materials regulated by this chapter must meet appropriate nationally recognized standards, if any, approved by the Director.

(c) Halogenated, non-carbon based gases may hydrolyze to their base mineral acid upon contact with moisture. Therefore, the monitoring and compatibility requirements of this chapter will apply to their decomposition products.

(Ord. No. NS-517.72, § 2, 4-15-03)

Exceptions & meaning →

Sec. B11-371. - Calculations for determining the class of mixtures.¶

(a) The LC 50 value for mixtures containing regulated materials must be calculated using the following formula:

LC 50 of Gas Mixture (ppm) =	1 ____________ (molar fraction of toxic component)/(ppm LC 50 of toxic component)

(b) If more than one toxic component is present, the LC 50 value will be calculated using the following formula:

LC 50 of Gas Mixture (ppm) =	1 ____________ n + [(f;sub \sub;) / (LC 50i )] i = 1

where f;sub\sub; is the mole fraction of the i th toxic component of the gas mixture and LC 50i is the LC 50 of the i th toxic component of the gas mixture.