The most appropriate word (answer) to fill in the blank is: prohibit.
OSHA is an acronym for occupational safety and health administration.
The Occupational Safety and Health Administration (OSHA) is a federal agency that is saddled with the responsibility of assuring and ensuring safe and healthy working conditions for employees by setting and enforcing standards, rules, providing education, trainings and assistance to various organizations.
According to the Occupational Safety and Health Administration (OSHA), trainings on the adoption and application of safety precautions (tools) such as wearing a personal protective equipment e.g face masks (respirators), ear plugs, safety boots, gloves, helmet, etc., are very important and are essentially to be used by employees (workers) while working in hazard prone environments or industries.
Occupational Safety and Health Administration (OSHA) standards prohibits the excessive accumulations of water around the place where workers perform their jobs (tasks) or any water accumulation in areas where there isn't a properly monitored water removal equipment in place when workers are in the trench.
In conclusion, Occupational Safety and Health Administration (OSHA) standards prohibits excessive water accumulations or any water accumulation without properly monitored water removal equipment to remove such water when workers are in the trench.
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