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Subchapter 20. Tunnel Safety Orders
Article 12. Ventilation and Dust Control

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§8438. Dust Control.

(a) Water or other effective means shall be used to control dust where drilling, grinding, or other dust producing operations occur in accordance with Section 1538(a) of the Construction Safety Orders.

(b) Sprinklers or other effective means shall be provided to control dust produced at dumps, conveyors, chutes, and other transfer points.

(c) Whenever water sprinklers are used to control dust at loading points, they shall be capable of being operated by the person(s) responsible for conducting the loading.

(d) The muck pile shall be wet down prior to mucking and kept wet during the mucking operations in order to control dust.

(e) If compliance with the requirements of this and other tunnel safety orders fail to hold dust concentrations in all parts of the tunnel within limits specified in Section 5155 of the General Industry Safety Orders, additional steps called for in Article 107 of those orders shall be followed.

NOTE: Authority cited: Sections 142.3 and 7997, Labor Code. Reference: Sections 142.3 and 7997, Labor Code.


1. Amendment of section heading and section and new Note filed 3-5-96; operative 4-4-96 (Register 96, No. 10).

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