CWEA CSM GRADE 2 - PRACTICE TEST QUESTIONS
WITH COMPLETE SOLUTIONS
List three advantages of vitrified clay pipe (VCP) for gravity sanitary sewers: -- Answer
✔✔ • High resistance to chemical corrosion
• High resistance to abrasion
• Wide range of fitting available
What must be conducted once a respirator has been chosen? -- Answer ✔✔ Fit Test
Restaurants are one of the major contributors of grease to a collection system, to
mitigate or control this problem all restaurants should have a ______ installed to
remove grease from the sewer? -- Answer ✔✔ Grease Traps or Grease Interceptors
List the four most common respirator types: -- Answer ✔✔ Self-Contained Breathing
Apparatus (SCBA), Supplied-Air Respirator (SAR), Powered- Air
Purifying Respirator (PAPR), Air-Purifying
Respirator (APR)
,What is required when there is a potential injury to the head from falling objects? --
Answer ✔✔ Head protection
What is the "haunch zone" of an excavation? -- Answer ✔✔ Either side of the arched
section in the bottom half of the pipe
What document would you require to be referenced when developing an S.O.P for
hazardous substance spill clean up? -- Answer ✔✔ MSDS
You arrive at an SSO and relieve the stoppage 27 minutes after a call was placed to
report it. You find that the spill was running at 6 gallons per minute, how much sewage
went uncaptured? -- Answer ✔✔ 162 gallons
What is the minimum length of a taper in a temporary traffic control setup? -- Answer
✔✔ 50ft.
What are some examples of level control devices (devices that turn a pump at a pump
station on and off)? -- Answer ✔✔ Bubbler Level Gauge, Mercury/Mechanical Float
Switches, Ultra Sonic Sensor
When is hand protection required? -- Answer ✔✔ When there is the potential for
injury or exposure to skin contact from chemicals, infectious agents, heat, cold, abrasive
or cutting objects.
What are some examples of additives that can prevent FOG build up? -- Answer ✔✔
Chemical degreasers, emulsifying degreasers, enzymes and bacteria
,What are the maximum allowable slopes or all the soil types? -- Answer ✔✔ Type A:
3/4:1
Type B: 1:1
Type C: 1.5:1
What is the formula for the area of a square? -- Answer ✔✔ Length x Width
What would cause a pump to deliver less than its expected rate of discharge? -- Answer
✔✔ Clogged impeller
What precautions should be taken for a chemical with a high flammability hazard? --
Answer ✔✔ Keep them stored in approved containers, keep emergency extinguishing
agents on hand when handling and near them in storage
When is hearing protection required? -- Answer ✔✔ When noise could induce hearing
loss
What is corrosivity? -- Answer ✔✔ chemicals that can cause tissue damage (permanent
bodily harm to the skin, eyes or respiratory tract)
What is the formula for the volume of a cube? -- Answer ✔✔ Length x Width x Height
What should you do before cleaning sewers? -- Answer ✔✔ Notify downstream
treatment plants and pump stations.
, What is the "dirt" formula? -- Answer ✔✔ Distance = Rate x Time
550 gallons of sewage overflow and do not reach any surface waters. What category of
overflow is this? -- Answer ✔✔ Category 3
What is the difference between a trench and an excavation? -- Answer ✔✔ A trench is
an excavation! Trenches specifically are deeper than they are wide, have a bottom width
of 15 feet or less and have a higher potential for wall cave in. Excavations are any man-
made work-related functions affected by earth removal or disturbance.
Roots can enter collection systems through: -- Answer ✔✔ Cracked pipes, broken
pipes, fractured pipes
What are the access points of a gravity sewer system? -- Answer ✔✔ Manholes, Lift
stations, Building connections, junction chambers, terminal cleanouts
What are some common types of valves? -- Answer ✔✔ Plug, Gate, Butterfly, Ball,
Check
You receive a call from dispatch at 4:30 pm informing you that raw sewage spewing out
of a manhole onto the ground and into an adjacent small stream. The caller said the
sewer has been overflowing since 2pm. You arrive at 5:15 and find that the spill is
overflowing at 166 gallons per minute. You clear the problem after 22 minutes, how
many reportable unrecoverable gallons of raw sewage had reached the creek? -- Answer
✔✔ 36,022 gallons
What is an Operating Range? -- Answer ✔✔ It is the range in which the pump in a pump
station is on.
WITH COMPLETE SOLUTIONS
List three advantages of vitrified clay pipe (VCP) for gravity sanitary sewers: -- Answer
✔✔ • High resistance to chemical corrosion
• High resistance to abrasion
• Wide range of fitting available
What must be conducted once a respirator has been chosen? -- Answer ✔✔ Fit Test
Restaurants are one of the major contributors of grease to a collection system, to
mitigate or control this problem all restaurants should have a ______ installed to
remove grease from the sewer? -- Answer ✔✔ Grease Traps or Grease Interceptors
List the four most common respirator types: -- Answer ✔✔ Self-Contained Breathing
Apparatus (SCBA), Supplied-Air Respirator (SAR), Powered- Air
Purifying Respirator (PAPR), Air-Purifying
Respirator (APR)
,What is required when there is a potential injury to the head from falling objects? --
Answer ✔✔ Head protection
What is the "haunch zone" of an excavation? -- Answer ✔✔ Either side of the arched
section in the bottom half of the pipe
What document would you require to be referenced when developing an S.O.P for
hazardous substance spill clean up? -- Answer ✔✔ MSDS
You arrive at an SSO and relieve the stoppage 27 minutes after a call was placed to
report it. You find that the spill was running at 6 gallons per minute, how much sewage
went uncaptured? -- Answer ✔✔ 162 gallons
What is the minimum length of a taper in a temporary traffic control setup? -- Answer
✔✔ 50ft.
What are some examples of level control devices (devices that turn a pump at a pump
station on and off)? -- Answer ✔✔ Bubbler Level Gauge, Mercury/Mechanical Float
Switches, Ultra Sonic Sensor
When is hand protection required? -- Answer ✔✔ When there is the potential for
injury or exposure to skin contact from chemicals, infectious agents, heat, cold, abrasive
or cutting objects.
What are some examples of additives that can prevent FOG build up? -- Answer ✔✔
Chemical degreasers, emulsifying degreasers, enzymes and bacteria
,What are the maximum allowable slopes or all the soil types? -- Answer ✔✔ Type A:
3/4:1
Type B: 1:1
Type C: 1.5:1
What is the formula for the area of a square? -- Answer ✔✔ Length x Width
What would cause a pump to deliver less than its expected rate of discharge? -- Answer
✔✔ Clogged impeller
What precautions should be taken for a chemical with a high flammability hazard? --
Answer ✔✔ Keep them stored in approved containers, keep emergency extinguishing
agents on hand when handling and near them in storage
When is hearing protection required? -- Answer ✔✔ When noise could induce hearing
loss
What is corrosivity? -- Answer ✔✔ chemicals that can cause tissue damage (permanent
bodily harm to the skin, eyes or respiratory tract)
What is the formula for the volume of a cube? -- Answer ✔✔ Length x Width x Height
What should you do before cleaning sewers? -- Answer ✔✔ Notify downstream
treatment plants and pump stations.
, What is the "dirt" formula? -- Answer ✔✔ Distance = Rate x Time
550 gallons of sewage overflow and do not reach any surface waters. What category of
overflow is this? -- Answer ✔✔ Category 3
What is the difference between a trench and an excavation? -- Answer ✔✔ A trench is
an excavation! Trenches specifically are deeper than they are wide, have a bottom width
of 15 feet or less and have a higher potential for wall cave in. Excavations are any man-
made work-related functions affected by earth removal or disturbance.
Roots can enter collection systems through: -- Answer ✔✔ Cracked pipes, broken
pipes, fractured pipes
What are the access points of a gravity sewer system? -- Answer ✔✔ Manholes, Lift
stations, Building connections, junction chambers, terminal cleanouts
What are some common types of valves? -- Answer ✔✔ Plug, Gate, Butterfly, Ball,
Check
You receive a call from dispatch at 4:30 pm informing you that raw sewage spewing out
of a manhole onto the ground and into an adjacent small stream. The caller said the
sewer has been overflowing since 2pm. You arrive at 5:15 and find that the spill is
overflowing at 166 gallons per minute. You clear the problem after 22 minutes, how
many reportable unrecoverable gallons of raw sewage had reached the creek? -- Answer
✔✔ 36,022 gallons
What is an Operating Range? -- Answer ✔✔ It is the range in which the pump in a pump
station is on.
