NGWA (AUGERING & MONITORING
WELL) EXAM STUDY GUIDE 2026
COMPLETE QUESTIONS WITH
CORRECT DETAILED ANSWERS ||
100% GUARANTEED PASS
<RECENT VERSION>
1. The primary item which dictates the type of drilling equipment to be used on
a site is... - ANSWER ✔ ... geology.
2. 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.
3. Which is NOT a component of a monitoring well rig? - ANSWER ✔ Mud
pump.
4. What is the minimum size hollow-stem auger, casing, or borehole used for
installation of a typical 2-inch well? - ANSWER ✔ 4.25 in.
,5. 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
6. Monitoring wells are commonly installed... - ANSWER ✔ ... downgradient
of a landfill to determine ground water contamination.
7. Which of the following is not an impermeable material? - ANSWER ✔ Sand
8. Due to the advanced technology, today's monitoring equipment and
material... - ANSWER ✔ ...
9. Glacial drift is defined as... - ANSWER ✔ Unconsolidated sediment
transported by glaciers and disposed and deposited directly on land or sea.
10.What type of material(s) is(are) typically on monitor wells for a seal above
the filter packs? - ANSWER ✔ Bentonite pellets.
11.Define aquifer - ANSWER ✔ saturated geologic unit that can store transmit
and yield groundwater in sufficient quantity to constitute a usable supply
12.What is the upper boundary in an unconfined aquifer - ANSWER ✔ water
table
13.What is the lower boundary in an unconfined aquifer - ANSWER ✔
impervious layer
, 14.What is the potentiometric surface - ANSWER ✔ the height the water could
potentially rise to if the confined aquifer is tapped by a well
15.When do flowing artesian conditions occur - ANSWER ✔ when the
potentiometric surface is above the top of the well casing
16.Wells must be constructed and installed properly to permit accurate
measurement of what three things - ANSWER ✔ Groundwater elevation, in-
situ hydraulic conductivity testing and aquifer testing
17.Stainless steel, corrugated galvanized steel, PVC pipe, and concrete -
ANSWER ✔ What are four types of casing materials
18.What is the size of the outer diameter for the casing of a drilled well -
ANSWER ✔ 5 to 6 inches
19.What is the size of the outer diameter for the casing of a bored well -
ANSWER ✔ 24 to 48 inches
20.What is the maximum installation depth of a groundwater well - ANSWER
✔ 300m
21.Horizontal hydraulic conductivity is determined by conducting what test -
ANSWER ✔ slug test
22.Name three unconsolidated surficial deposits - ANSWER ✔ colluvial,
fluvial,lacustrine
WELL) EXAM STUDY GUIDE 2026
COMPLETE QUESTIONS WITH
CORRECT DETAILED ANSWERS ||
100% GUARANTEED PASS
<RECENT VERSION>
1. The primary item which dictates the type of drilling equipment to be used on
a site is... - ANSWER ✔ ... geology.
2. 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.
3. Which is NOT a component of a monitoring well rig? - ANSWER ✔ Mud
pump.
4. What is the minimum size hollow-stem auger, casing, or borehole used for
installation of a typical 2-inch well? - ANSWER ✔ 4.25 in.
,5. 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
6. Monitoring wells are commonly installed... - ANSWER ✔ ... downgradient
of a landfill to determine ground water contamination.
7. Which of the following is not an impermeable material? - ANSWER ✔ Sand
8. Due to the advanced technology, today's monitoring equipment and
material... - ANSWER ✔ ...
9. Glacial drift is defined as... - ANSWER ✔ Unconsolidated sediment
transported by glaciers and disposed and deposited directly on land or sea.
10.What type of material(s) is(are) typically on monitor wells for a seal above
the filter packs? - ANSWER ✔ Bentonite pellets.
11.Define aquifer - ANSWER ✔ saturated geologic unit that can store transmit
and yield groundwater in sufficient quantity to constitute a usable supply
12.What is the upper boundary in an unconfined aquifer - ANSWER ✔ water
table
13.What is the lower boundary in an unconfined aquifer - ANSWER ✔
impervious layer
, 14.What is the potentiometric surface - ANSWER ✔ the height the water could
potentially rise to if the confined aquifer is tapped by a well
15.When do flowing artesian conditions occur - ANSWER ✔ when the
potentiometric surface is above the top of the well casing
16.Wells must be constructed and installed properly to permit accurate
measurement of what three things - ANSWER ✔ Groundwater elevation, in-
situ hydraulic conductivity testing and aquifer testing
17.Stainless steel, corrugated galvanized steel, PVC pipe, and concrete -
ANSWER ✔ What are four types of casing materials
18.What is the size of the outer diameter for the casing of a drilled well -
ANSWER ✔ 5 to 6 inches
19.What is the size of the outer diameter for the casing of a bored well -
ANSWER ✔ 24 to 48 inches
20.What is the maximum installation depth of a groundwater well - ANSWER
✔ 300m
21.Horizontal hydraulic conductivity is determined by conducting what test -
ANSWER ✔ slug test
22.Name three unconsolidated surficial deposits - ANSWER ✔ colluvial,
fluvial,lacustrine
