Texas Commission on Environmental Quality (TCEQ). Class C Water License Exam

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Prepare for the Texas Commission on Environmental Quality (TCEQ) Class C Water License Exam. Utilize flashcards, multiple choice questions, and in-depth explanations. Equip yourself with the skills to succeed!

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What is the minimum oxygen percentage that should not be entered without an approved breathing apparatus?

20.0%
19.5%
18.5%
21.0%

The correct answer is: 19.5%

The minimum oxygen percentage that should not be entered without an approved breathing apparatus is 19.5%. This level is significant because it is the generally recognized threshold for safe breathing in confined spaces. The Occupational Safety and Health Administration (OSHA) sets this standard to help prevent hypoxia, which can occur in environments where oxygen levels drop below this point. When the oxygen concentration falls below 19.5%, there is a risk of impaired judgment, reduced coordination, and even loss of consciousness. A reading at or below this threshold signifies an unsafe environment, necessitating the use of supplemental oxygen or breathing apparatus to ensure safety for workers entering or working in such areas. Additionally, oxygen levels that are excessively low can pose life-threatening risks, making adherence to this guideline crucial for safety practices. The other options represent oxygen levels that are either safe or too high for concern, emphasizing the importance of maintaining oxygen within safe limits to ensure the well-being of personnel in potentially hazardous environments.