NGWA - Study Questions - Auguring &
Monitoring Well
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? - answerMud pump.
What is the minimum size hollow-stem auger, casing, or borehole used for installation of
a typical 2-inch well? - answer4.25 in.
The best drilling method to use in a highly toxic contaminated limestone formation that
would produce the least fluid management would be? - answerCable 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? - answerSand
Due to the advanced technology, today's monitoring equipment and material... -
answer...
Glacial drift is defined as... - answerUnconsolidated 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? - answerBentonite 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... -
answer4-5 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... -
answerInspection of cable, hoses, etc.
All fluid levels
First aid kit available
The drilling method used to construct a monitoring well should... - answer... minimize
disturbance of subsurface materials
The "auger fork" is a device that slips through the flights of the auger column and... -
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... - 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... - answer... no drilling fluid is used,
eliminating contamination by drilling fluid additives.
A disadvantage of using cable tool drilling for monitoring wells is... - answer... possible
problems in controlling heaving sands.
Air in the discharge line of a recovery well system could be caused by... - answerHole in
drop pipe
Cascading water
Plugged screen and cavitation
Contamination from the cement grout leaking into the filter pack may be indicated by... -
answer... high pH.
Prior to leaving a hazardous waste site, decontamination is done in order to... -
answer... make sure no contamination leaves the site.
What is the method for removing sand that has entered the hollow-stem auger after you
have drilled below the water table? - answerWash the sand out with approved water.
When the drill cuttings exceed the volume of the borehole while hollow-stem auger
drilling, you have usually... - answer... encountered flowing sand.
Hollow-stem augers are commonly used to install wells because... - answer... soil
sampling is easy and accurate in most cases.
Proper screen selection for a ground water monitoring well should include... - answer...
slot size matched to filter pack material.
Monitoring Well
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? - answerMud pump.
What is the minimum size hollow-stem auger, casing, or borehole used for installation of
a typical 2-inch well? - answer4.25 in.
The best drilling method to use in a highly toxic contaminated limestone formation that
would produce the least fluid management would be? - answerCable 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? - answerSand
Due to the advanced technology, today's monitoring equipment and material... -
answer...
Glacial drift is defined as... - answerUnconsolidated 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? - answerBentonite 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... -
answer4-5 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... -
answerInspection of cable, hoses, etc.
All fluid levels
First aid kit available
The drilling method used to construct a monitoring well should... - answer... minimize
disturbance of subsurface materials
The "auger fork" is a device that slips through the flights of the auger column and... -
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... - 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... - answer... no drilling fluid is used,
eliminating contamination by drilling fluid additives.
A disadvantage of using cable tool drilling for monitoring wells is... - answer... possible
problems in controlling heaving sands.
Air in the discharge line of a recovery well system could be caused by... - answerHole in
drop pipe
Cascading water
Plugged screen and cavitation
Contamination from the cement grout leaking into the filter pack may be indicated by... -
answer... high pH.
Prior to leaving a hazardous waste site, decontamination is done in order to... -
answer... make sure no contamination leaves the site.
What is the method for removing sand that has entered the hollow-stem auger after you
have drilled below the water table? - answerWash the sand out with approved water.
When the drill cuttings exceed the volume of the borehole while hollow-stem auger
drilling, you have usually... - answer... encountered flowing sand.
Hollow-stem augers are commonly used to install wells because... - answer... soil
sampling is easy and accurate in most cases.
Proper screen selection for a ground water monitoring well should include... - answer...
slot size matched to filter pack material.
