TCEQ class A water license exam
Already Passed!! / Texas Wastewater A
What is TCEQ doing to control "point source" pollution of the Texas waterways? -
✔✔✔ANSWER-*Permitting of domestic wastewater plants
*Permitting of industrial wastewater plants
Describe proper design of force main wastewater lines. - ✔✔✔ANSWER-
Minimum two fps velocity with the smallest pump operating alone. Minimum four
inch diameter pipe with 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 two fps and a
maximum of ten fps.
,Manholes should have a minimum opening of? - ✔✔✔ANSWER-24 inches
and be at least 4 feet wide.
pH meters should be calibrated how often? What standards should be used for
calibration purposes? - ✔✔✔ANSWER-Daily with at least two buffers.
What is the standard chlorine residual and minimum contact time on Texas
wastewater permits? - ✔✔✔ANSWER-a. 1.0 mg/L for a minimum 20 minutes
detention time at peak flow b. No chlorine residual needed if detention time is
greater than 21 days
As the complexity of an organization increases, what management function
becomes most important? - ✔✔✔ANSWER-Planning
What is the effective chlorine disinfecting agent? - ✔✔✔ANSWER-
Hypochlorous Acid (HOCl)
Does pH affect the chlorination process? Explain your answer. -
✔✔✔ANSWER-When using free chlorine the disinfectant is HOCl acid. As
such it is much more effective at pH's below 7.0. Above 7.0 pH the acid begins to
be neutralized.
What is the effluent chlorine residual in Texas that is standard on permits and the
minimum detention time? What is the maximum residual allowed? -
, ✔✔✔ANSWER-Texas standard is 1.0 mg/L for a minimum 20 minutes
detention time at peak flow. Maximum residual allowed is 4.0 mg/L.
A treatment plant has a clarifier that is 60 feet in diameter and is 10 feet deep. The
weir is 2 feet inside the outer clarifier wall. The flow is 1.0 MGD. The weir and
outflow channel is 3 feet deep. a. What is the detention time in hours? -
✔✔✔ANSWER-Formula
What activated process cannot nitrify in a single stage? - ✔✔✔ANSWER-
Contact Stabilization
What is the GPM output of a piston pump with an 8-inch diameter piston with a
10-inch stroke operating at 50 strokes per minute? - ✔✔✔ANSWER-Formula
A treatment plant has a clarifier that is 60 feet in diameter and is 10 feet deep. The
weir is 2 feet inside the outer clarifier wall. The flow is 1.0 MGD. The weir and
outflow channel is 3 feet deep.
a. What is the detention time in hours?
b. What is the surface loading in gal/ft2/day?
c. What is the weir loading in gal/linear ft/day? - ✔✔✔ANSWER-Formulas
A primary clarifier has a flow of 3.0 MGD and has a diameter of 100 feet. It is 12
feet deep and has 24 inches of freeboard. What is the detention time in hours? -
✔✔✔ANSWER-Formulas
Already Passed!! / Texas Wastewater A
What is TCEQ doing to control "point source" pollution of the Texas waterways? -
✔✔✔ANSWER-*Permitting of domestic wastewater plants
*Permitting of industrial wastewater plants
Describe proper design of force main wastewater lines. - ✔✔✔ANSWER-
Minimum two fps velocity with the smallest pump operating alone. Minimum four
inch diameter pipe with 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 two fps and a
maximum of ten fps.
,Manholes should have a minimum opening of? - ✔✔✔ANSWER-24 inches
and be at least 4 feet wide.
pH meters should be calibrated how often? What standards should be used for
calibration purposes? - ✔✔✔ANSWER-Daily with at least two buffers.
What is the standard chlorine residual and minimum contact time on Texas
wastewater permits? - ✔✔✔ANSWER-a. 1.0 mg/L for a minimum 20 minutes
detention time at peak flow b. No chlorine residual needed if detention time is
greater than 21 days
As the complexity of an organization increases, what management function
becomes most important? - ✔✔✔ANSWER-Planning
What is the effective chlorine disinfecting agent? - ✔✔✔ANSWER-
Hypochlorous Acid (HOCl)
Does pH affect the chlorination process? Explain your answer. -
✔✔✔ANSWER-When using free chlorine the disinfectant is HOCl acid. As
such it is much more effective at pH's below 7.0. Above 7.0 pH the acid begins to
be neutralized.
What is the effluent chlorine residual in Texas that is standard on permits and the
minimum detention time? What is the maximum residual allowed? -
, ✔✔✔ANSWER-Texas standard is 1.0 mg/L for a minimum 20 minutes
detention time at peak flow. Maximum residual allowed is 4.0 mg/L.
A treatment plant has a clarifier that is 60 feet in diameter and is 10 feet deep. The
weir is 2 feet inside the outer clarifier wall. The flow is 1.0 MGD. The weir and
outflow channel is 3 feet deep. a. What is the detention time in hours? -
✔✔✔ANSWER-Formula
What activated process cannot nitrify in a single stage? - ✔✔✔ANSWER-
Contact Stabilization
What is the GPM output of a piston pump with an 8-inch diameter piston with a
10-inch stroke operating at 50 strokes per minute? - ✔✔✔ANSWER-Formula
A treatment plant has a clarifier that is 60 feet in diameter and is 10 feet deep. The
weir is 2 feet inside the outer clarifier wall. The flow is 1.0 MGD. The weir and
outflow channel is 3 feet deep.
a. What is the detention time in hours?
b. What is the surface loading in gal/ft2/day?
c. What is the weir loading in gal/linear ft/day? - ✔✔✔ANSWER-Formulas
A primary clarifier has a flow of 3.0 MGD and has a diameter of 100 feet. It is 12
feet deep and has 24 inches of freeboard. What is the detention time in hours? -
✔✔✔ANSWER-Formulas
