NGWA GENERAL DRILLING EXAM STUDY
QUESTIONS AND ANSWERS CORRECT
ANSWERS AND SOLUTIONS
◉ The primary item which dictates the type of drilling equipment to
be used on a site is... Answer: ... geology.
◉ The commonly used hollow-stem auger system for monitoring well
installations... Answer: ... should include an auger head than can be
machined to accent a plate that facilitates well installation below the
ground water level.
◉ Which is NOT a component of a monitoring well rig? Answer:
Mud pump.
◉ What is the minimum size hollow-stem auger, casing, or borehole
used for installation of a typical 2-inch well? Answer: 4.25 in.
◉ The best drilling method to use in a highly toxic contaminated
limestone formation that would produce the least fluid management
would be? Answer: Cable tool
◉ Monitoring wells are commonly installed... Answer: ...
downgradient of a landfill to determine ground water contamination.
, ◉ Which of the following is not an impermeable material? Answer:
Sand
◉ Due to the advanced technology, today's monitoring equipment and
material... Answer: ...
◉ Glacial drift is defined as... Answer: Unconsolidated sediment
transported by glaciers and disposed and deposited directly on land or
sea.
◉ What type of material(s) is(are) typically on monitor wells for a
seal above the filter packs? Answer: Bentonite pellets.
◉ The most efficient method of drilling a bedrock monitoring well
would be... Answer: ... air rotary with a down-hole hammer.
◉ The difference between the flight OD and the ID of a hollow-stem
auger is generally... Answer: 4-5 inches.
◉ The safety of operation of a hollow-stem auger drill rig is
compromised when... Answer: ... drilling operations occur closer than
the 100' safety zone from an electrical line.
◉ Daily inspection of drilling equipment should include, but is not
limited to... Answer: Inspection of cable, hoses, etc.
QUESTIONS AND ANSWERS CORRECT
ANSWERS AND SOLUTIONS
◉ The primary item which dictates the type of drilling equipment to
be used on a site is... Answer: ... geology.
◉ The commonly used hollow-stem auger system for monitoring well
installations... Answer: ... should include an auger head than can be
machined to accent a plate that facilitates well installation below the
ground water level.
◉ Which is NOT a component of a monitoring well rig? Answer:
Mud pump.
◉ What is the minimum size hollow-stem auger, casing, or borehole
used for installation of a typical 2-inch well? Answer: 4.25 in.
◉ The best drilling method to use in a highly toxic contaminated
limestone formation that would produce the least fluid management
would be? Answer: Cable tool
◉ Monitoring wells are commonly installed... Answer: ...
downgradient of a landfill to determine ground water contamination.
, ◉ Which of the following is not an impermeable material? Answer:
Sand
◉ Due to the advanced technology, today's monitoring equipment and
material... Answer: ...
◉ Glacial drift is defined as... Answer: Unconsolidated sediment
transported by glaciers and disposed and deposited directly on land or
sea.
◉ What type of material(s) is(are) typically on monitor wells for a
seal above the filter packs? Answer: Bentonite pellets.
◉ The most efficient method of drilling a bedrock monitoring well
would be... Answer: ... air rotary with a down-hole hammer.
◉ The difference between the flight OD and the ID of a hollow-stem
auger is generally... Answer: 4-5 inches.
◉ The safety of operation of a hollow-stem auger drill rig is
compromised when... Answer: ... drilling operations occur closer than
the 100' safety zone from an electrical line.
◉ Daily inspection of drilling equipment should include, but is not
limited to... Answer: Inspection of cable, hoses, etc.
