NGWA - STUDY QUESTIONS - GENERAL DRILLING
EXAM (ANSWERED) CORRECTLY TO SCORE A+
Artesian pressure
Correct Answer: Pressure from confined groundwater due to gravity.
The primary item which dictates the type of drilling equipment to be used on a site is...
Correct Answer: Geology.
The commonly used hollow-stem auger system for monitoring well installations...
Correct 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?
Correct Answer: Mud pump.
What is the minimum size hollow-stem auger, casing, or borehole used for installation of a
typical 2-inch well?
Correct 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?
Correct Answer: Cable tool
,Monitoring wells are commonly installed...
Correct Answer: Downgradient of a landfill to determine ground water contamination.
Which of the following is not an impermeable material?
Correct Answer: Sand
Due to the advanced technology, today's monitoring equipment and material...
...
Glacial drift is defined as...
Correct 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?
Correct Answer: Bentonite pellets.
The most efficient method of drilling a bedrock monitoring well would be...
Correct Answer: Air rotary with a down-hole hammer.
The difference between the flight od and the id of a hollow-stem auger is generally...
Correct Answer: 4-5 inches.
, The safety of operation of a hollow-stem auger drill rig is compromised when...
Correct 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...
• Inspection of cable, hoses, etc.
• All fluid levels
• First aid kit available
The drilling method used to construct a monitoring well should...
Correct Answer: Minimize disturbance of subsurface materials
The "auger fork" is a device that slips through the flights of the auger column and...
Correct Answer: Keeps the augers from "sliding" back into the borehole when removing the
augers from the borehole.
For drilling operations at a hazardous waste site, the exclusion zone is...
Correct Answer: The area on-site that is potentially contaminated and where workers must
wear ppe as stipulated in the site specific health and safety plan.
An advantage of using hollow-stem augers is...
Correct Answer: No drilling fluid is used, eliminating contamination by drilling fluid additives.
EXAM (ANSWERED) CORRECTLY TO SCORE A+
Artesian pressure
Correct Answer: Pressure from confined groundwater due to gravity.
The primary item which dictates the type of drilling equipment to be used on a site is...
Correct Answer: Geology.
The commonly used hollow-stem auger system for monitoring well installations...
Correct 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?
Correct Answer: Mud pump.
What is the minimum size hollow-stem auger, casing, or borehole used for installation of a
typical 2-inch well?
Correct 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?
Correct Answer: Cable tool
,Monitoring wells are commonly installed...
Correct Answer: Downgradient of a landfill to determine ground water contamination.
Which of the following is not an impermeable material?
Correct Answer: Sand
Due to the advanced technology, today's monitoring equipment and material...
...
Glacial drift is defined as...
Correct 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?
Correct Answer: Bentonite pellets.
The most efficient method of drilling a bedrock monitoring well would be...
Correct Answer: Air rotary with a down-hole hammer.
The difference between the flight od and the id of a hollow-stem auger is generally...
Correct Answer: 4-5 inches.
, The safety of operation of a hollow-stem auger drill rig is compromised when...
Correct 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...
• Inspection of cable, hoses, etc.
• All fluid levels
• First aid kit available
The drilling method used to construct a monitoring well should...
Correct Answer: Minimize disturbance of subsurface materials
The "auger fork" is a device that slips through the flights of the auger column and...
Correct Answer: Keeps the augers from "sliding" back into the borehole when removing the
augers from the borehole.
For drilling operations at a hazardous waste site, the exclusion zone is...
Correct Answer: The area on-site that is potentially contaminated and where workers must
wear ppe as stipulated in the site specific health and safety plan.
An advantage of using hollow-stem augers is...
Correct Answer: No drilling fluid is used, eliminating contamination by drilling fluid additives.
