NGWA - STUDY QUESTIONS -
AUGERING & MONITORING WELL
EXAM WITH COMPLETE SOLUTIONS
The primary item which dictates the type of drilling equipment to be used on a site is... -
ANS... geology.
The commonly used hollow-stem auger system for monitoring well installations... -
ANS... 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? - ANSMud pump.
What is the minimum size hollow-stem auger, casing, or borehole used for installation of
a typical 2-inch well? - ANS4.25 in.
The best drilling method to use in a highly toxic contaminated limestone formation that
would produce the least fluid management would be? - ANSCable tool
Monitoring wells are commonly installed... - ANS... downgradient of a landfill to
determine ground water contamination.
Which of the following is not an impermeable material? - ANSSand
Due to the advanced technology, today's monitoring equipment and material... - ANS...
Glacial drift is defined as... - ANSUnconsolidated 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? - ANSBentonite pellets.
The most efficient method of drilling a bedrock monitoring well would be... - ANS... air
rotary with a down-hole hammer.
The difference between the flight OD and the ID of a hollow-stem auger is generally... -
ANS4-5 inches.
, The safety of operation of a hollow-stem auger drill rig is compromised when... - ANS...
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... -
ANSInspection of cable, hoses, etc.
All fluid levels
First aid kit available
The drilling method used to construct a monitoring well should... - ANS... minimize
disturbance of subsurface materials
The "auger fork" is a device that slips through the flights of the auger column and... -
ANS... 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... - ANS... 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... - ANS... no drilling fluid is used,
eliminating contamination by drilling fluid additives.
A disadvantage of using cable tool drilling for monitoring wells is... - ANS... possible
problems in controlling heaving sands.
Air in the discharge line of a recovery well system could be caused by... - ANSHole in
drop pipe
Cascading water
Plugged screen and cavitation
Contamination from the cement grout leaking into the filter pack may be indicated by... -
ANS... high pH.
Prior to leaving a hazardous waste site, decontamination is done in order to... - ANS...
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? - ANSWash the sand out with approved water.
When the drill cuttings exceed the volume of the borehole while hollow-stem auger
drilling, you have usually... - ANS... encountered flowing sand.
Hollow-stem augers are commonly used to install wells because... - ANS... soil
sampling is easy and accurate in most cases.
AUGERING & MONITORING WELL
EXAM WITH COMPLETE SOLUTIONS
The primary item which dictates the type of drilling equipment to be used on a site is... -
ANS... geology.
The commonly used hollow-stem auger system for monitoring well installations... -
ANS... 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? - ANSMud pump.
What is the minimum size hollow-stem auger, casing, or borehole used for installation of
a typical 2-inch well? - ANS4.25 in.
The best drilling method to use in a highly toxic contaminated limestone formation that
would produce the least fluid management would be? - ANSCable tool
Monitoring wells are commonly installed... - ANS... downgradient of a landfill to
determine ground water contamination.
Which of the following is not an impermeable material? - ANSSand
Due to the advanced technology, today's monitoring equipment and material... - ANS...
Glacial drift is defined as... - ANSUnconsolidated 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? - ANSBentonite pellets.
The most efficient method of drilling a bedrock monitoring well would be... - ANS... air
rotary with a down-hole hammer.
The difference between the flight OD and the ID of a hollow-stem auger is generally... -
ANS4-5 inches.
, The safety of operation of a hollow-stem auger drill rig is compromised when... - ANS...
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... -
ANSInspection of cable, hoses, etc.
All fluid levels
First aid kit available
The drilling method used to construct a monitoring well should... - ANS... minimize
disturbance of subsurface materials
The "auger fork" is a device that slips through the flights of the auger column and... -
ANS... 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... - ANS... 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... - ANS... no drilling fluid is used,
eliminating contamination by drilling fluid additives.
A disadvantage of using cable tool drilling for monitoring wells is... - ANS... possible
problems in controlling heaving sands.
Air in the discharge line of a recovery well system could be caused by... - ANSHole in
drop pipe
Cascading water
Plugged screen and cavitation
Contamination from the cement grout leaking into the filter pack may be indicated by... -
ANS... high pH.
Prior to leaving a hazardous waste site, decontamination is done in order to... - ANS...
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? - ANSWash the sand out with approved water.
When the drill cuttings exceed the volume of the borehole while hollow-stem auger
drilling, you have usually... - ANS... encountered flowing sand.
Hollow-stem augers are commonly used to install wells because... - ANS... soil
sampling is easy and accurate in most cases.
