NGWA EXAMS SET 2025 QUESTIONS AND ANSWERS
RATED A+
✔✔A piezometer is... - ✔✔... an instrument placed in the ground water used to measure
pressure (head).
✔✔Hollow-stem auger drill rigs have many components which make up the drill rig.
Which items are not generally part of the package? - ✔✔Down the hole hammer and
float sub.
✔✔Which of the following is not a standard industry term in the monitoring field? -
✔✔Ping rods.
✔✔Tremie pipe or line is a device, usually a small diameter pipe or hose, that performs
the following functions... - ✔✔... allows pressure grouting from the bottom of the hole
without introduction of air pockets.
✔✔The following method(s) is/are not commonly acceptable for well development. -
✔✔The Haliburton method.
✔✔When bentonite is used in drilling the borehole for constructing a monitoring well,
which method is best for removing the bentonite from the screen area? - ✔✔Using
deflocculant agents and surging.
✔✔What is the main purpose for developing monitoring wells? - ✔✔To obtain
representative water samples.
✔✔What characteristic(s) may be observed to determine proper development of a
ground water monitoring well? - ✔✔1. Turbidity.
2. Temperature.
3. pH
✔✔A poorly developed monitoring well can lead to which of the following? - ✔✔1. Low
production rate.
2. High turbidity.
3. Non-representative ground water samples.
✔✔The completion of a log is essential for... - ✔✔1. Compliance with regulatory entities.
2. The drilling contractor's reference.
3. The property Owner's records.
✔✔Which of the following information should be included in the driller's log for
monitoring well construction? - ✔✔1. Depth to water.
2. Odors from cuttings.
, 3. Loss of drilling fluid.
✔✔Which of the following items are recorded during monitor well development? - ✔✔1.
Water level before and after development.
2. Number of gallons removed during development.
3. Clarity of water before and after development.
✔✔An auger head uses... - ✔✔... tungsten faced forged steel teeth.
✔✔The hollow-stem auger cutter head should be what size in relation to the hollow-
stem augers to drill and convey cuttings effectively... - ✔✔The same size as.
✔✔Different types of knock-out plugs are used when reaming holes. Which type is not
generally used? - ✔✔Flat low carbon steel.
✔✔Which of the following is not used in mud management? - ✔✔Inflatable packer.
✔✔The most important function of the drilling fluids in rotary drilling is - ✔✔To bring
cuttings from the bottom of the hole.
✔✔In selecting a fluid for a well, the following consideration should be given. - ✔✔Fluid
should be selected on the basis of the circumstances of each individual well.
✔✔When selecting a screen for a monitoring well, which of the following is not a
consideration? - ✔✔Type of well head seal.
✔✔The purpose for making a sieve analysis of sand and gravel formations in monitoring
well construction is... - ✔✔... to select the proper screen slot opening.
✔✔When backfilling the annulus of a monitoring well after the filter pack and seal are in
place, the best material to use is... - ✔✔... cement and/or bentonite grout materials.
✔✔Which material is best for a typical 2-inch monitoring well filter pack? - ✔✔Coarse
clean silica sand.
✔✔Without regard to sampling parameters, which of the four typical types of materials
used for monitoring wells would deteriorate the quickest in a low pH environment? -
✔✔Steel.
✔✔A flush mount well cover should have... - ✔✔... concrete in the base.
✔✔If decontamination procedures are not followed, what piece(s) of drill equipment is
(are) most likely to contaminate a well? - ✔✔1. Drill rods.
RATED A+
✔✔A piezometer is... - ✔✔... an instrument placed in the ground water used to measure
pressure (head).
✔✔Hollow-stem auger drill rigs have many components which make up the drill rig.
Which items are not generally part of the package? - ✔✔Down the hole hammer and
float sub.
✔✔Which of the following is not a standard industry term in the monitoring field? -
✔✔Ping rods.
✔✔Tremie pipe or line is a device, usually a small diameter pipe or hose, that performs
the following functions... - ✔✔... allows pressure grouting from the bottom of the hole
without introduction of air pockets.
✔✔The following method(s) is/are not commonly acceptable for well development. -
✔✔The Haliburton method.
✔✔When bentonite is used in drilling the borehole for constructing a monitoring well,
which method is best for removing the bentonite from the screen area? - ✔✔Using
deflocculant agents and surging.
✔✔What is the main purpose for developing monitoring wells? - ✔✔To obtain
representative water samples.
✔✔What characteristic(s) may be observed to determine proper development of a
ground water monitoring well? - ✔✔1. Turbidity.
2. Temperature.
3. pH
✔✔A poorly developed monitoring well can lead to which of the following? - ✔✔1. Low
production rate.
2. High turbidity.
3. Non-representative ground water samples.
✔✔The completion of a log is essential for... - ✔✔1. Compliance with regulatory entities.
2. The drilling contractor's reference.
3. The property Owner's records.
✔✔Which of the following information should be included in the driller's log for
monitoring well construction? - ✔✔1. Depth to water.
2. Odors from cuttings.
, 3. Loss of drilling fluid.
✔✔Which of the following items are recorded during monitor well development? - ✔✔1.
Water level before and after development.
2. Number of gallons removed during development.
3. Clarity of water before and after development.
✔✔An auger head uses... - ✔✔... tungsten faced forged steel teeth.
✔✔The hollow-stem auger cutter head should be what size in relation to the hollow-
stem augers to drill and convey cuttings effectively... - ✔✔The same size as.
✔✔Different types of knock-out plugs are used when reaming holes. Which type is not
generally used? - ✔✔Flat low carbon steel.
✔✔Which of the following is not used in mud management? - ✔✔Inflatable packer.
✔✔The most important function of the drilling fluids in rotary drilling is - ✔✔To bring
cuttings from the bottom of the hole.
✔✔In selecting a fluid for a well, the following consideration should be given. - ✔✔Fluid
should be selected on the basis of the circumstances of each individual well.
✔✔When selecting a screen for a monitoring well, which of the following is not a
consideration? - ✔✔Type of well head seal.
✔✔The purpose for making a sieve analysis of sand and gravel formations in monitoring
well construction is... - ✔✔... to select the proper screen slot opening.
✔✔When backfilling the annulus of a monitoring well after the filter pack and seal are in
place, the best material to use is... - ✔✔... cement and/or bentonite grout materials.
✔✔Which material is best for a typical 2-inch monitoring well filter pack? - ✔✔Coarse
clean silica sand.
✔✔Without regard to sampling parameters, which of the four typical types of materials
used for monitoring wells would deteriorate the quickest in a low pH environment? -
✔✔Steel.
✔✔A flush mount well cover should have... - ✔✔... concrete in the base.
✔✔If decontamination procedures are not followed, what piece(s) of drill equipment is
(are) most likely to contaminate a well? - ✔✔1. Drill rods.
