Labor Code section 7961


The division shall investigate immediately any notification of a gas reading 10 percent of the lower explosive limit or higher by an employer in a tunnel or underground mine classified as potentially gassy. If the inspection determines the likelihood of encountering more gas or vapor, the division may halt operations until the tunnel or mine can be reclassified.

Source: Section 7961, https://leginfo.­legislature.­ca.­gov/faces/codes_displaySection.­xhtml?lawCode=LAB§ionNum=7961.­ (updated Jan. 1, 1972; accessed Jun. 16, 2025).

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§ 7961’s source at ca​.gov