Wastewater Practice Test
Wastewater Practice Test (Florida)
Questions with Detailed Solutions
Graded A+ 2025
According to FDEP chapter 62-600.440 (4) (b) FAC, basic level disinfection is described
as: -Correct Answer ✔A chlorine residual of 0.5 mg/L for 15 minutes at peak hourly flow
FDEP chapter 62-604.550 (a) FAC, requires a wastewater spill shall be verbally
reported to the state warning point no later than: -Correct Answer ✔24hrs from
discovery
What is the 'rule of thumb' regarding pump packing? -Correct Answer ✔Never put rings
of new packing over the old packing
According to FDEP chapter 62-60, FAC, a composite sample shall be used for which
test? -Correct Answer ✔Effluent CBOD
Chlorine residual can be measured in several ways, including the use of DPD reagent,
spectrophotometers and iodometric titration. Which of the following is also an approved
method? -Correct Answer ✔Amperometric Titration
Chapter 62-601, Domestic wastewater treatment plant monitoring, states that on-site
tests for total residual chlorine, pH, and _______ can be performed under the direction
of a certified operator: -Correct Answer ✔Dissolved Oxygen(DO)
Starting this type of pump against a closed valve can cause major damage to the pump,
pump piping, the operator, or all three -Correct Answer ✔Positive displacement pump
These types of samples may be used for CBOD5 and nutrients at flows less than
100,000 GPD, according to chapter 62-601 -Correct Answer ✔Grab samples
According to FDEP chapter 62-602, drinking water and wastewater treatment plant
operators, duties of operators includes reporting to the permittee and the department,
as soon as possible, but within 24hrs: -Correct Answer ✔Any major interruption of
service
What could cause a centrifugal above ground pump to be noisy while running -Correct
Answer ✔Debris caught in the impeller housing
According to FDEP chapter 62-601 FAC, Domestic wastewater treatment plant
monitoring, discharge monitoring reports (DMRs) for the previous month must be
Wastewater Practice Test
, Wastewater Practice Test
submitted to the department by the ____________ day of the current month? -Correct
Answer ✔28th day
FDEP chapter 62-600 FC, domestic wastewater facilities, states that all treatment plants
shall be____________ -Correct Answer ✔Fenced
As the operator of a primary clarifier, you notice a black and odorous septic wastewater
leaving the clarifier. What is the probable cause? -Correct Answer ✔Improper sludge
removal
A fire has started in the maintenance shop due to an ignition of petroleum oil. Which
type of fire extinguisher should NOT be used to fight the fire? -Correct Answer
✔Pressurized water
Chlorine gas is how many times heavier than air -Correct Answer ✔2.5
The combination of methane and ____________ can be very combustible -Correct
Answer ✔Oxygen
Plant effluent coliform count fails to meet the required standards for disinfection.
Chlorine residual is normal. Disinfectant supplies ARE NOT a problem. What is the
probable cause? -Correct Answer ✔Contact time too short
A fixed sample is: -Correct Answer ✔A sample purposely spiked by the lab technician
for QA/QC
According to FDEP chapter 62-602 FAC, an operator could have his license
permanently revoked for: -Correct Answer ✔Falsified or misrepresented reports, logs, or
lab sheets
What process do the bacteria perform in the stabilization(re-aeration) tank in the contact
stabilization process? -Correct Answer ✔Absorption and digestion of the waste material
they collected
A screenings dumpster at the head works of the treatment plant is full at the end of the
day. The dumpster is 6ft tall, 10ft long, and 8ft wide. How many cubic yards of
screenings must be disposed of in a 30 day month? -Correct Answer ✔533 (6 x 10 x 8 =
480) (480 /27 = 17.7) (17.7 x 30 = 533)
When properly adjusted, the rope packing on a centrifugal pump is designed to leak
how much? -Correct Answer ✔One drip per second
Wastewater Practice Test
Wastewater Practice Test (Florida)
Questions with Detailed Solutions
Graded A+ 2025
According to FDEP chapter 62-600.440 (4) (b) FAC, basic level disinfection is described
as: -Correct Answer ✔A chlorine residual of 0.5 mg/L for 15 minutes at peak hourly flow
FDEP chapter 62-604.550 (a) FAC, requires a wastewater spill shall be verbally
reported to the state warning point no later than: -Correct Answer ✔24hrs from
discovery
What is the 'rule of thumb' regarding pump packing? -Correct Answer ✔Never put rings
of new packing over the old packing
According to FDEP chapter 62-60, FAC, a composite sample shall be used for which
test? -Correct Answer ✔Effluent CBOD
Chlorine residual can be measured in several ways, including the use of DPD reagent,
spectrophotometers and iodometric titration. Which of the following is also an approved
method? -Correct Answer ✔Amperometric Titration
Chapter 62-601, Domestic wastewater treatment plant monitoring, states that on-site
tests for total residual chlorine, pH, and _______ can be performed under the direction
of a certified operator: -Correct Answer ✔Dissolved Oxygen(DO)
Starting this type of pump against a closed valve can cause major damage to the pump,
pump piping, the operator, or all three -Correct Answer ✔Positive displacement pump
These types of samples may be used for CBOD5 and nutrients at flows less than
100,000 GPD, according to chapter 62-601 -Correct Answer ✔Grab samples
According to FDEP chapter 62-602, drinking water and wastewater treatment plant
operators, duties of operators includes reporting to the permittee and the department,
as soon as possible, but within 24hrs: -Correct Answer ✔Any major interruption of
service
What could cause a centrifugal above ground pump to be noisy while running -Correct
Answer ✔Debris caught in the impeller housing
According to FDEP chapter 62-601 FAC, Domestic wastewater treatment plant
monitoring, discharge monitoring reports (DMRs) for the previous month must be
Wastewater Practice Test
, Wastewater Practice Test
submitted to the department by the ____________ day of the current month? -Correct
Answer ✔28th day
FDEP chapter 62-600 FC, domestic wastewater facilities, states that all treatment plants
shall be____________ -Correct Answer ✔Fenced
As the operator of a primary clarifier, you notice a black and odorous septic wastewater
leaving the clarifier. What is the probable cause? -Correct Answer ✔Improper sludge
removal
A fire has started in the maintenance shop due to an ignition of petroleum oil. Which
type of fire extinguisher should NOT be used to fight the fire? -Correct Answer
✔Pressurized water
Chlorine gas is how many times heavier than air -Correct Answer ✔2.5
The combination of methane and ____________ can be very combustible -Correct
Answer ✔Oxygen
Plant effluent coliform count fails to meet the required standards for disinfection.
Chlorine residual is normal. Disinfectant supplies ARE NOT a problem. What is the
probable cause? -Correct Answer ✔Contact time too short
A fixed sample is: -Correct Answer ✔A sample purposely spiked by the lab technician
for QA/QC
According to FDEP chapter 62-602 FAC, an operator could have his license
permanently revoked for: -Correct Answer ✔Falsified or misrepresented reports, logs, or
lab sheets
What process do the bacteria perform in the stabilization(re-aeration) tank in the contact
stabilization process? -Correct Answer ✔Absorption and digestion of the waste material
they collected
A screenings dumpster at the head works of the treatment plant is full at the end of the
day. The dumpster is 6ft tall, 10ft long, and 8ft wide. How many cubic yards of
screenings must be disposed of in a 30 day month? -Correct Answer ✔533 (6 x 10 x 8 =
480) (480 /27 = 17.7) (17.7 x 30 = 533)
When properly adjusted, the rope packing on a centrifugal pump is designed to leak
how much? -Correct Answer ✔One drip per second
Wastewater Practice Test
