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 2 - Safe Practices and Personal Protection
Article 7 - Miscellaneous Safe Practices
Section 3310 - Discharge Location

(a) The discharge opening from traps, drains, and blowoffs shall be located so as not to endanger the safety of employees.

(b) Internal combustion engine exhaust pipe outlets shall be so located that the exhaust vapors or gases will not be drawn into the air inlets of air compressors or air conditioning systems.

(c) Exhaust condensed steam shall not reduce the visibility around machinery or on walkways, roads, and runways to the extent that hazards to employees are created by such reduction in visibility.

(d) Relief or vent discharges of tanks or other closed vessels in which there are toxic or flammable vapors or gases, fumes, dusts or other harmful substances shall be located so as not to endanger the safety of employees. When it is impractical to divert dangerous concentrations of toxic or flammable vapors or gases, fumes, dusts or other harmful substances from such working areas, employees performing work of a transient nature in these areas shall be provided with, and shall wear, approved respiratory and personal protective equipment.