Wastewater class 2 Ohio ABC part 1
EXAM Questions and Answers (latest
version verified for accuracy) | Latest!!
(Verified Answers) Study Guide|| 2026/27
Most important factor in preventing accidents at a wastewater plant? -
CORRECTANSWER Attitude of the employees.
Plant influent appears black and has a foul odor each morning. The cause is traced to a
pump station at a subdivision which is oversized for the current number of homes in the
subdivision. What corrective action can you take? -CORRECTANSWER Decrease the
distance between the on and off probes in the wet well.
Which of the following best describes the term "public relations"? -CORRECTANSWER
All contacts between the staff of the utility and those outside the staff.
What is a cross connection? -CORRECTANSWER Result of wastewater coming into
contact with potable water.
Why is it recommended that approved backflow prevention devices be installed above
grade level? -CORRECTANSWER To prevent the relief port of the device from ever
becoming submerged.
,Your plant's discharge permit requires that effluent suspended solids be tested 3 days
per week. You test five samples per week. What should you report? -
CORRECTANSWER All five results.
At a minimum, how often should contact lists on emergency response plans be verified?
-CORRECTANSWER Quarterly.
According to the Code of Federal Regulations the term "Significant Industrial User"
includes. -CORRECTANSWER A non-domestic discharger that discharges over 25,000
gallons per day of process wastewater or is subject to specific federal pretreatment
standards.
What document is used to evaluate compliances with personal protective equipment
guidelines? -CORRECTANSWER Occupational Safety and Health Standards.
Which term describes the calculated amount by which the value of a utility's physical
property declines annually at a predetermined rate? -CORRECTANSWER
Depreciation.
According to 40 CFR, a discharge to a municipal separate storm sewer system that is
composed of storm water mixed with industrial waste is defined by EPA as a(n)? -
CORRECTANSWER Illicit discharge.
, The main detrimental effect infiltration/inflow has on plant performance is to. -
CORRECTANSWER Cut down the hydraulic detention time.
Which of the following explains how to handle a chlorine release? -CORRECTANSWER
Emergency response plan
Which of the following is the most significant problem in using the activated sludge
process to treat seasonal cannery waste? -CORRECTANSWER Nutrient imbalance
An auto flow proportional chlorination system is working properly. However in the
morning hours when the flow is increasing, the operator is unable to obtain a chlorine
residual. What is causing the problem? -CORRECTANSWER Nitrites in the effluent.
To achieve an overall threat rating for a specific emergency event, a wastewater utility
should consider the frequency of past occurrences, the probability of future
occurrences, and -CORRECTANSWER Magnitude of impact.
Uniforms, i.d., and system logos on wastewater system vehicles are critical components
of -CORRECTANSWER public awareness and security program
First step in solving odor problem at plant? -CORRECTANSWER Make an onsite
inspection.
EXAM Questions and Answers (latest
version verified for accuracy) | Latest!!
(Verified Answers) Study Guide|| 2026/27
Most important factor in preventing accidents at a wastewater plant? -
CORRECTANSWER Attitude of the employees.
Plant influent appears black and has a foul odor each morning. The cause is traced to a
pump station at a subdivision which is oversized for the current number of homes in the
subdivision. What corrective action can you take? -CORRECTANSWER Decrease the
distance between the on and off probes in the wet well.
Which of the following best describes the term "public relations"? -CORRECTANSWER
All contacts between the staff of the utility and those outside the staff.
What is a cross connection? -CORRECTANSWER Result of wastewater coming into
contact with potable water.
Why is it recommended that approved backflow prevention devices be installed above
grade level? -CORRECTANSWER To prevent the relief port of the device from ever
becoming submerged.
,Your plant's discharge permit requires that effluent suspended solids be tested 3 days
per week. You test five samples per week. What should you report? -
CORRECTANSWER All five results.
At a minimum, how often should contact lists on emergency response plans be verified?
-CORRECTANSWER Quarterly.
According to the Code of Federal Regulations the term "Significant Industrial User"
includes. -CORRECTANSWER A non-domestic discharger that discharges over 25,000
gallons per day of process wastewater or is subject to specific federal pretreatment
standards.
What document is used to evaluate compliances with personal protective equipment
guidelines? -CORRECTANSWER Occupational Safety and Health Standards.
Which term describes the calculated amount by which the value of a utility's physical
property declines annually at a predetermined rate? -CORRECTANSWER
Depreciation.
According to 40 CFR, a discharge to a municipal separate storm sewer system that is
composed of storm water mixed with industrial waste is defined by EPA as a(n)? -
CORRECTANSWER Illicit discharge.
, The main detrimental effect infiltration/inflow has on plant performance is to. -
CORRECTANSWER Cut down the hydraulic detention time.
Which of the following explains how to handle a chlorine release? -CORRECTANSWER
Emergency response plan
Which of the following is the most significant problem in using the activated sludge
process to treat seasonal cannery waste? -CORRECTANSWER Nutrient imbalance
An auto flow proportional chlorination system is working properly. However in the
morning hours when the flow is increasing, the operator is unable to obtain a chlorine
residual. What is causing the problem? -CORRECTANSWER Nitrites in the effluent.
To achieve an overall threat rating for a specific emergency event, a wastewater utility
should consider the frequency of past occurrences, the probability of future
occurrences, and -CORRECTANSWER Magnitude of impact.
Uniforms, i.d., and system logos on wastewater system vehicles are critical components
of -CORRECTANSWER public awareness and security program
First step in solving odor problem at plant? -CORRECTANSWER Make an onsite
inspection.
