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TCEQ Wastewater Exam A Questions With Correct Answers
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TCEQ Wastewater Exam A Questions With Correct Answers Describe proper design of force main wastewater lines - answerMinimum 2 fps velocity with the smallest pump operating alone. Minimum 4 inch diameter pipe 150 psi rating. What is Standard Dimension Ratio? - answerRatio of outside pipe diame...

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  • October 21, 2024
  • 43
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

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  • tceq wastewater exam a questions with correct answ

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©SIRJOEL EXAM SOLUTIONS
12/3/2024 11:27AM



TCEQ Wastewater Exam A Questions With
Correct Answers


Describe proper design of force main wastewater lines - answer✔Minimum 2 fps velocity with

the smallest pump operating alone.

Minimum 4 inch diameter pipe

150 psi rating.


What is Standard Dimension Ratio? - answer✔Ratio of outside pipe diameter (OD) to wall

thickness (PVC)


Describe proper design of gravity wastewater lines. - answer✔Designed to flow half full under

normal conditions at a minimum of 2 fps

maximum of 10 fps.


A primary clarifier should remove how much BOD and TSS? - answer✔30% to 40% BOD


50% to 70 % TSS


What is a wastewater outfall line? - answer✔Main line that carries the wastewater to the

treatment plant.

, ©SIRJOEL EXAM SOLUTIONS
12/3/2024 11:27AM


What are the minimum slopes for pipe sizes six, eight, ten, and 12 inches? What are these slopes

designed to achieve? - answer✔6 inch - 0.50 ft slope per 100 ft


8 inch - 0.33 ft slope per 100 ft

10 inch - 0.25 ft slope per 100 ft

12 inch - 0.20 ft slope per 100 ft

You have 3900 feet of 10-inch pipe on a grade of 0.25. What is the elevation difference from one

end to the other? - answer✔3900/100 = 39 sections of pipe 39 ( 39 x 0.25 = 9.75 ft = 9 ft 9 inc


A 12-inch line is on a 0.20 foot/100 foot grade. Point A is at an elevation of 127.6 feet. Point B is

600 feet downstream of point A and point C is 500 feet downstream of point B. What is the

elevation of points B and C? - answer✔A = 127.6


600

600 x (.2 ft / 100 ft) = 1.2 ft

B = 127.6 - 1.2 = 126.4 ft

500 x (.2ft/100ft) = 1 ft

C = 126.4-1= 125.4


List two methods of establishing grades when laying wastewater lines? - answer✔a. string and

rod

, ©SIRJOEL EXAM SOLUTIONS
12/3/2024 11:27AM


b. batter boards

c. lasers


A 20-inch pipe is flowing at 4000 GPM. What is the velocity in the pipe? - answer✔CFS = (pipe

area (sq^2)) x (Velocity (fps))

4000 gpm / 449 gpm/cfs = 8.91 cfs

R = (20/12)/2 = 0.833

sq ft = 3.14 (0.833)^2 = 2.18 ft^2

8.91 = 2.18 ft x V =

V = 8.91/2.18

V(FPS) = 4.09


Define infiltration and inflow. Give some examples of each. - answer✔Infiltration is water

entering wastewater lines around joints, bad taps, or other small holes in the pipe caused by

roots, etc. Infiltration usually occurs from ground water. Inflow is the direct flow of storm water

into the system from direct connections of roof drains, etc., bad manholes, large openings in pipe

such as old concrete pipe, or direct connections to storm water lines.

What are some common methods for detecting leaks in a wastewater collection system? -

answer✔a. infiltration/exfiltration testing


b. low pressure air

, ©SIRJOEL EXAM SOLUTIONS
12/3/2024 11:27AM


c. smoke testing

d. television

e. dye testing

Manholes should have a minimum opening of _________ and be at least _________ wide. The

invert depth should be at least ________ the diameter of the pipe. - answer✔24 inches


4 ft

1/2


What is the normal DO range in the aeration basin of an activated sludge plant? - answer✔2.0 to

4.0 mg/L absolute minimum of 1.0 mg/L

Which activated sludge process can operate the aeration basin below 2.0 mg/L D.O.? Explain

why. - answer✔Extended aeration or racetracks. This process keeps the bugs starving and holds

them for a longer time. (Endogenous growth phase)


List several methods of wastewater flow measurements - answer✔a. V notch or rectangular

weirs

b. Parshall flumes

c. Ultrasonic

d. Venturi

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