TEXAS WASTEWATER CLASS A PRACTICE
EXAM
Question 1: What is the primary role of the Texas Commission on Environmental
Quality (TCEQ) in controlling 'point source' pollution of Texas waterways?
Choices:
1) Issuing permits for domestic and industrial wastewater plants.2) Regulating agricultural runo� only.3) Providing funding for recreational water activities.4) Monitoring air quality around industrial facilities.
Correct Answer: Option 1
Explanation: TCEQ controls 'point source' pollution by permitting domestic and industrial wastewater plants, setting discharge limits, and ensuring compliance.Question 2: According to proper design, gravity wastewater lines should �ow at what capacity under normal conditions and within what velocity range?
Choices:
1) Full, at a minimum of one fps and a maximum of �ve fps.2) Half full, at a minimum of two fps and a maximum of ten fps.3) Quarter full, at a minimum of three fps and a maximum of eight fps.4) Three-quarters full, at a minimum of 0.5 fps and a maximum of six fps.
Correct Answer: Option 2
Explanation: Gravity wastewater lines are designed to �ow half full, under normal conditions, at a minimum of two feet per second (fps) and a maximum of ten fps.
Question 3: What is the minimum opening size required for manholes in a
wastewater collection system?
Choices:
1) 18 inches 2) 20 inches 3) 24 inches 4) 30 inches
Correct Answer: Option 3
Explanation: Manholes should have a minimum opening of 24 inches and be at least 4 feet wide.
Question 4: How often should pH meters be calibrated, and what standards should
be used for calibration purposes?
Choices:
1) Weekly, with one bu�er solution.2) Monthly, with at least two bu�er solutions.3) Daily, with at least two bu�er solutions.4) Annually, with a single reference standard.
Correct Answer: Option 3
Explanation: pH meters should be calibrated daily with at least two bu�er solutions to ensure accuracy.
Question 5: What is the standard chlorine residual and minimum contact time
required on Texas wastewater permits?
Choices:
1) 0.5 mg/L for a minimum 10 minutes detention time.2) 1.0 mg/L for a minimum 20 minutes detention time at peak �ow.3) 2.0 mg/L for a minimum 30 minutes detention time.4) 0.2 mg/L for a minimum 15 minutes detention time.
Correct Answer: Option 2
Explanation: The Texas standard for chlorine residual is 1.0 mg/L for a minimum 20 minutes detention time at peak �ow, with a maximum residual allowed of 4.0 mg/L.Question 6: What is considered the most e�ective chlorine disinfecting agent in wastewater treatment?
Choices:
1) Chloramine 2) Hypochlorite ion (OCl-) 3) Hypochlorous acid (HOCl) 4) Free chlorine gas (Cl2)
Correct Answer: Option 3
Explanation: Hypochlorous acid (HOCl) is the most e�ective chlorine disinfecting agent.