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WATER DISTRIBUTION D2 CALIFORNIA
ACTUAL EXAM PREP 2026 ALL QUESTIONS
AND CORRECT DETAILED ANSWERS ALREADY
A GRADED WITH EXPERT FEEDBACK |NEW
AND REVISED
When must a pressure regulator be installed on a consumer's service
line? - ANSWER- GREATER than 80 PSI.
What is the highest acceptable PSI within a system, before a pressure
regulator needs to be installed? - ANSWER- 80 PSI
Why are higher pressures generally not desired within a system? -
ANSWER- It can damage plumbing fixtures.
Dynamic Pressure - ANSWER- The pressure within a system when
water is moving.
Six types of pipe found in a water distribution system - ANSWER-
Ductile Iron, Concrete, Steel, Asbestos Cement, Plastic and Gray Cast
Iron.
C-Value - ANSWER- The measure of interior smoothness within a pipe.
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What does a 140+ C-Value mean? - ANSWER- Very smooth interior
surface of a pipe (Plastic, AC, Concrete)
What does a <100 C-Value mean? - ANSWER- Very bad interior
surface of a pipe (Tuburculated old cast iron)
What is a Pnetrometer? - ANSWER- A tool for measuring the
compressive strength of soil.
What is a Competent Person? - ANSWER- An individual with
excavation knowledge and training who is in charge of an excavation
job, and who has the power to start work in the event of a hazard
When is shoring generally required? - ANSWER- When a trench is 5' or
more in depth, or hazardous soil conditions exist.
Sloping - ANSWER- Editing back the sides of a trench
Sheeting - ANSWER- The process of placing tightly placed planks on
the walls of a trench, when conditions are poor.
What is Shielding, and what are the two requirements that go alongside
it? - ANSWER- A steel box that protects workers in a hole. Should
extend a minimum of 18" above the top of the hole, and should be no
more than 2' from the bottom of the excavation.
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Shoring - ANSWER- A framework of wood, metal, or both.
What are the minimum depth requirements for mains? - ANSWER- 2
1/2' for mains, and 1 1/2' for services. Deeper if necessary in cold
climates.
What is a Story Pole? - ANSWER- A tool used for measuring depth in a
trench.
What are the trench width requirements when installing a pipe? -
ANSWER- 1' to 2' greater than the pipe diameter.
What is the requirement of portable ladders when placed in a trench? -
ANSWER- A portable ladder must extend 3' above the trench.
When should a portable ladder be placed in a trench/excavation? -
ANSWER- When an excavation is 4' or more in depth.
When it comes to trenches, what is the specific rule for the distance
between ladders and workers? - ANSWER- A worker must always be
within 25' of a ladder while working inside a trench. If a trench is 50'
long, only one ladder is required, if it's placed in the center of the trench.
While installing a run of pipe, which way is the bell end of the pipe
facing? - ANSWER- The bell end of the pipe faces forward, in the
direction that work is progressing.
WATER DISTRIBUTION D2 CALIFORNIA
ACTUAL EXAM PREP 2026 ALL QUESTIONS
AND CORRECT DETAILED ANSWERS ALREADY
A GRADED WITH EXPERT FEEDBACK |NEW
AND REVISED
When must a pressure regulator be installed on a consumer's service
line? - ANSWER- GREATER than 80 PSI.
What is the highest acceptable PSI within a system, before a pressure
regulator needs to be installed? - ANSWER- 80 PSI
Why are higher pressures generally not desired within a system? -
ANSWER- It can damage plumbing fixtures.
Dynamic Pressure - ANSWER- The pressure within a system when
water is moving.
Six types of pipe found in a water distribution system - ANSWER-
Ductile Iron, Concrete, Steel, Asbestos Cement, Plastic and Gray Cast
Iron.
C-Value - ANSWER- The measure of interior smoothness within a pipe.
,2|Page
What does a 140+ C-Value mean? - ANSWER- Very smooth interior
surface of a pipe (Plastic, AC, Concrete)
What does a <100 C-Value mean? - ANSWER- Very bad interior
surface of a pipe (Tuburculated old cast iron)
What is a Pnetrometer? - ANSWER- A tool for measuring the
compressive strength of soil.
What is a Competent Person? - ANSWER- An individual with
excavation knowledge and training who is in charge of an excavation
job, and who has the power to start work in the event of a hazard
When is shoring generally required? - ANSWER- When a trench is 5' or
more in depth, or hazardous soil conditions exist.
Sloping - ANSWER- Editing back the sides of a trench
Sheeting - ANSWER- The process of placing tightly placed planks on
the walls of a trench, when conditions are poor.
What is Shielding, and what are the two requirements that go alongside
it? - ANSWER- A steel box that protects workers in a hole. Should
extend a minimum of 18" above the top of the hole, and should be no
more than 2' from the bottom of the excavation.
, 3|Page
Shoring - ANSWER- A framework of wood, metal, or both.
What are the minimum depth requirements for mains? - ANSWER- 2
1/2' for mains, and 1 1/2' for services. Deeper if necessary in cold
climates.
What is a Story Pole? - ANSWER- A tool used for measuring depth in a
trench.
What are the trench width requirements when installing a pipe? -
ANSWER- 1' to 2' greater than the pipe diameter.
What is the requirement of portable ladders when placed in a trench? -
ANSWER- A portable ladder must extend 3' above the trench.
When should a portable ladder be placed in a trench/excavation? -
ANSWER- When an excavation is 4' or more in depth.
When it comes to trenches, what is the specific rule for the distance
between ladders and workers? - ANSWER- A worker must always be
within 25' of a ladder while working inside a trench. If a trench is 50'
long, only one ladder is required, if it's placed in the center of the trench.
While installing a run of pipe, which way is the bell end of the pipe
facing? - ANSWER- The bell end of the pipe faces forward, in the
direction that work is progressing.
