TEXAS WASTEWATER CLASS A FINAL
SCRIPT 2026 PRACTICE SOLUTIONS
GRADED A+
⩥ When is blue-green algae the most dominant on a pond treatment
system?.
Answer: Summer
⩥ A 30-inch diameter wastewater interceptor is observed to be flowing
half-full at about two fps. The approximate volume of wastewater
flowing through the pipe is 3.14x1.25 x 1.25 x 2 = 4.9 cfs x 449 = 2,200
gpm.
Answer: c. 2,200 gallons per minute
⩥ A one-cylinder reciprocating sludge pump with a 10-inch bore and a
5-inch stroke pumps at a rate of 50 cycles per minute. How many
minutes must the pump be operated to pump 5,000 gallons of sludge?
3.14x0.416 x 0.416 x0.416 x 50 x7.48 = 84.5 gpm 5000 gal = 59,2min
84.5 gpm b. 29.
Answer: 60 minutes
⩥ If an existing centrifugal pump motor is replaced with a motor with 25
percent more speed, the motor horsepower required will increase by 1.25
x 1.25 x 1.25 = 1.95.
,Answer: 95 percent
⩥ When must TCEQ be notified about expansions of a treatment
facility?.
Answer: Before construction
⩥ In an anaerobic digester, the percentage of methane and carbon
dioxide gas content should be.
Answer: 70% methane, 30% carbon dioxide
⩥ The temperature of an anaerobic digester should be maintained at a
minimum of.
Answer: 95° F
⩥ What type of wastewater treatment operates in the endogenous
bacteria growth phase?.
Answer: Extended air
⩥ Why is recirculation needed in a trickling filter?.
Answer: Keep the media wet Further reduce BOD All of the above (a, b,
and c)
⩥ What type of fire extinguisher would be used on an electrical control
panel that has been de-energized?.
,Answer: Class A Class C (a and d)
⩥ Disinfection with chlorine is the most effective at a pH of.
Answer: 6.0
⩥ The biomass on a normal functioning RBC has what appearance?.
Answer: Grey to brown and 0.05 to 0.1 inch thick
⩥ The sludge from a primary clarifier should percent solids?.
Answer: 4% to 6%
⩥ What is eutrophication in a pond system?.
Answer: Enrichment with nitrogen and phosphorous Causes algae
blooms (b and c)
⩥ How often should pH meters be calibrated?.
Answer: Daily
⩥ In Texas, pH meters are required to be calibrated on how many
buffers?.
Answer: two
, ⩥ An industrial complex has a BOD discharge to the POTW of 500
pounds per day. The population equivalent of this industry is 500 lbs =
2,941 0.17 lbs BOD person.
Answer: 2941
⩥ The parameters of the BOD test are.
Answer: 5 days at 20° Centigrade
⩥ Standard Dimension Ratio in pvc pipe is defined as.
Answer: Ratio of OD pipe diameter to wall thickness
⩥ How should shoring be removed from a trench?.
Answer: up from the bottom up
⩥ In low pressure sewer systems where each tap must have a grinder
pump lift station, station is considered to be.
Answer: part of the collection system and the responsibility of the utility
⩥ Effective communication depends on.
Answer: being a good listener
⩥ When designing a wastewater collection system, the engineer
considers the population for how many years in the future?.
SCRIPT 2026 PRACTICE SOLUTIONS
GRADED A+
⩥ When is blue-green algae the most dominant on a pond treatment
system?.
Answer: Summer
⩥ A 30-inch diameter wastewater interceptor is observed to be flowing
half-full at about two fps. The approximate volume of wastewater
flowing through the pipe is 3.14x1.25 x 1.25 x 2 = 4.9 cfs x 449 = 2,200
gpm.
Answer: c. 2,200 gallons per minute
⩥ A one-cylinder reciprocating sludge pump with a 10-inch bore and a
5-inch stroke pumps at a rate of 50 cycles per minute. How many
minutes must the pump be operated to pump 5,000 gallons of sludge?
3.14x0.416 x 0.416 x0.416 x 50 x7.48 = 84.5 gpm 5000 gal = 59,2min
84.5 gpm b. 29.
Answer: 60 minutes
⩥ If an existing centrifugal pump motor is replaced with a motor with 25
percent more speed, the motor horsepower required will increase by 1.25
x 1.25 x 1.25 = 1.95.
,Answer: 95 percent
⩥ When must TCEQ be notified about expansions of a treatment
facility?.
Answer: Before construction
⩥ In an anaerobic digester, the percentage of methane and carbon
dioxide gas content should be.
Answer: 70% methane, 30% carbon dioxide
⩥ The temperature of an anaerobic digester should be maintained at a
minimum of.
Answer: 95° F
⩥ What type of wastewater treatment operates in the endogenous
bacteria growth phase?.
Answer: Extended air
⩥ Why is recirculation needed in a trickling filter?.
Answer: Keep the media wet Further reduce BOD All of the above (a, b,
and c)
⩥ What type of fire extinguisher would be used on an electrical control
panel that has been de-energized?.
,Answer: Class A Class C (a and d)
⩥ Disinfection with chlorine is the most effective at a pH of.
Answer: 6.0
⩥ The biomass on a normal functioning RBC has what appearance?.
Answer: Grey to brown and 0.05 to 0.1 inch thick
⩥ The sludge from a primary clarifier should percent solids?.
Answer: 4% to 6%
⩥ What is eutrophication in a pond system?.
Answer: Enrichment with nitrogen and phosphorous Causes algae
blooms (b and c)
⩥ How often should pH meters be calibrated?.
Answer: Daily
⩥ In Texas, pH meters are required to be calibrated on how many
buffers?.
Answer: two
, ⩥ An industrial complex has a BOD discharge to the POTW of 500
pounds per day. The population equivalent of this industry is 500 lbs =
2,941 0.17 lbs BOD person.
Answer: 2941
⩥ The parameters of the BOD test are.
Answer: 5 days at 20° Centigrade
⩥ Standard Dimension Ratio in pvc pipe is defined as.
Answer: Ratio of OD pipe diameter to wall thickness
⩥ How should shoring be removed from a trench?.
Answer: up from the bottom up
⩥ In low pressure sewer systems where each tap must have a grinder
pump lift station, station is considered to be.
Answer: part of the collection system and the responsibility of the utility
⩥ Effective communication depends on.
Answer: being a good listener
⩥ When designing a wastewater collection system, the engineer
considers the population for how many years in the future?.
