1|Page
NGWA Water Systems Certification Exam (Greater
Than 100 GPM – Exam L)||Verified Exam|| Practice
Questions And Correct Answers (Verified Answers)
Plus Rationales 2026/2027 Q&A | Instant Download Pdf
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
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.
,2|Page
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.
All fluid levels
First aid kit available
The drilling method used to construct a monitoring well
should... - Answer-... minimize disturbance of subsurface
materials
,3|Page
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.
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.
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
, 4|Page
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... - Answer-Hole 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.
NGWA Water Systems Certification Exam (Greater
Than 100 GPM – Exam L)||Verified Exam|| Practice
Questions And Correct Answers (Verified Answers)
Plus Rationales 2026/2027 Q&A | Instant Download Pdf
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
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.
,2|Page
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.
All fluid levels
First aid kit available
The drilling method used to construct a monitoring well
should... - Answer-... minimize disturbance of subsurface
materials
,3|Page
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.
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.
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
, 4|Page
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... - Answer-Hole 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.
