What is the minimum number of employees that require adequate toilet facilities on construction sites?

In construction sites, regulations regarding sanitation requirements are primarily guided by the standards set forth by the Occupational Safety and Health Administration (OSHA) and other related safety codes. The correct choice indicates that a minimum of 30 employees on a construction site necessitates adequate toilet facilities. This is based on health and safety standards aimed at ensuring that workers have access to essential sanitation facilities, which are vital for maintaining hygiene and preventing health issues.

When there are 30 or more employees, it becomes crucial for employers to provide these facilities to ensure compliance with health regulations. This requirement helps to promote a safe and healthy working environment, showing an understanding of the need for adequate sanitation in construction settings where access to proper facilities can be limited.

The other numbers provided in the question represent thresholds where regulations may vary in terms of the specifics of the required facilities, but they do not meet the criteria set for the most immediate need regarding the minimum standard for adequate toilet access for a workforce of 30 or more.