CWEA Collection System Maintenance
Practice Quiz Questions With Correct
Answers
Required personal protective equipment (PPE) for confined space entry - ✔✔✔✔Hard hat, gloves, eye
protection, and a gas monitor.
Infiltration in a sewer system - ✔✔✔✔Groundwater entering the system through defects.
I&I in wastewater collection - ✔✔✔✔Infiltration and Inflow.
How flow is typically measured in a sewer pipe - ✔✔✔✔Using a flow meter.
Main purpose of a lift station - ✔✔✔✔To pump wastewater to a higher elevation.
Safe oxygen level for confined space entry - ✔✔✔✔19.5% to 23.5%.
Tool used to clear tree roots from sewer lines - ✔✔✔✔Mechanical rodding machine.
What to do before entering a manhole - ✔✔✔✔Test the atmosphere for toxic and flammable gases.
Primary purpose of a wastewater collection system - ✔✔✔✔To transport wastewater from its source to
a treatment facility.
Commonly used pipe for gravity sewer systems - ✔✔✔✔PVC (Polyvinyl Chloride).
, Function of a manhole in a collection system - ✔✔✔✔To provide access for inspection and
maintenance.
Force main - ✔✔✔✔A pressurized pipe that conveys wastewater from a pump.
Symptom of sewer gas exposure - ✔✔✔✔Headaches and dizziness.
Type of maintenance that removes grease and sediment buildup - ✔✔✔✔Hydrojetting or high-pressure
cleaning.
Common sign of a failing sewer lateral - ✔✔✔✔Frequent backups or slow drainage.
SCADA - ✔✔✔✔Supervisory Control and Data Acquisition.
Frequency of sewer line inspections - ✔✔✔✔Annually or based on system criticality.
Main goal of a preventive maintenance program - ✔✔✔✔To reduce emergency repairs and extend
asset life.
Common gas found in sewers - ✔✔✔✔Hydrogen sulfide.
Combination sewer system - ✔✔✔✔A sewer that carries both stormwater and wastewater.
Type of map showing layout of a collection system - ✔✔✔✔As-built or GIS map.
Common source of inflow in a sewer system - ✔✔✔✔Illegal stormwater connections like roof drains.
How grease traps help in sewer maintenance - ✔✔✔✔They capture grease before it enters the sewer
lines.
Practice Quiz Questions With Correct
Answers
Required personal protective equipment (PPE) for confined space entry - ✔✔✔✔Hard hat, gloves, eye
protection, and a gas monitor.
Infiltration in a sewer system - ✔✔✔✔Groundwater entering the system through defects.
I&I in wastewater collection - ✔✔✔✔Infiltration and Inflow.
How flow is typically measured in a sewer pipe - ✔✔✔✔Using a flow meter.
Main purpose of a lift station - ✔✔✔✔To pump wastewater to a higher elevation.
Safe oxygen level for confined space entry - ✔✔✔✔19.5% to 23.5%.
Tool used to clear tree roots from sewer lines - ✔✔✔✔Mechanical rodding machine.
What to do before entering a manhole - ✔✔✔✔Test the atmosphere for toxic and flammable gases.
Primary purpose of a wastewater collection system - ✔✔✔✔To transport wastewater from its source to
a treatment facility.
Commonly used pipe for gravity sewer systems - ✔✔✔✔PVC (Polyvinyl Chloride).
, Function of a manhole in a collection system - ✔✔✔✔To provide access for inspection and
maintenance.
Force main - ✔✔✔✔A pressurized pipe that conveys wastewater from a pump.
Symptom of sewer gas exposure - ✔✔✔✔Headaches and dizziness.
Type of maintenance that removes grease and sediment buildup - ✔✔✔✔Hydrojetting or high-pressure
cleaning.
Common sign of a failing sewer lateral - ✔✔✔✔Frequent backups or slow drainage.
SCADA - ✔✔✔✔Supervisory Control and Data Acquisition.
Frequency of sewer line inspections - ✔✔✔✔Annually or based on system criticality.
Main goal of a preventive maintenance program - ✔✔✔✔To reduce emergency repairs and extend
asset life.
Common gas found in sewers - ✔✔✔✔Hydrogen sulfide.
Combination sewer system - ✔✔✔✔A sewer that carries both stormwater and wastewater.
Type of map showing layout of a collection system - ✔✔✔✔As-built or GIS map.
Common source of inflow in a sewer system - ✔✔✔✔Illegal stormwater connections like roof drains.
How grease traps help in sewer maintenance - ✔✔✔✔They capture grease before it enters the sewer
lines.
