NGWA GENERAL DRILLING CORE EXAM TEST 2025/2026
QUESTIONS WITH SOLUTIONS GRADED A+
✔✔(T/F) The size of annular space required for grouting depends on how the well was
drilled. - ✔✔True.
✔✔Which of the following materials is the most aaccepteable material to use for
grouting and/or hole abandonment? - ✔✔Neat cement.
✔✔(T/F) A well which is finished completely underground, for example a pitless adaptor,
does not need a sanitary surface seal. - ✔✔False.
✔✔A water system operating at 40% to 60% pressure setting indicates... - ✔✔... the
pump starts at 40 and will shut off at 60.
✔✔One gallon of water weighs how many pounds? - ✔✔8.34
✔✔Your well is 6" diameter, 150' deep, and has swl of 50'. How many gallons of water
are within this well column of water at the very bottom of this well? - ✔✔150 gal.
✔✔How many galloons are in a cubic foot? - ✔✔7.48
✔✔Water system pressure is expressed in? - ✔✔PSI
✔✔One cubic foot equals... - ✔✔7.4805 gallons
✔✔The difference between static water level and pumping water level in a well... - ✔✔...
is called the drawdown.
✔✔(T/F) Well development procedures should be able to clean the well so the sand
concentration in the water is below the maximum allowable limit set for particular water
use. - ✔✔True.
✔✔Well drilled using guar gums and several polymers can achieve better development
by using ________ mixes in the development water. - ✔✔Sodium or calcium
hypochlorite.
✔✔(T/F) Aquifer development is not an effective way to increase yields substantially. -
✔✔False.
✔✔ Artesian Pressure is generally... - ✔✔... a result of gravity and confining beds.
QUESTIONS WITH SOLUTIONS GRADED A+
✔✔(T/F) The size of annular space required for grouting depends on how the well was
drilled. - ✔✔True.
✔✔Which of the following materials is the most aaccepteable material to use for
grouting and/or hole abandonment? - ✔✔Neat cement.
✔✔(T/F) A well which is finished completely underground, for example a pitless adaptor,
does not need a sanitary surface seal. - ✔✔False.
✔✔A water system operating at 40% to 60% pressure setting indicates... - ✔✔... the
pump starts at 40 and will shut off at 60.
✔✔One gallon of water weighs how many pounds? - ✔✔8.34
✔✔Your well is 6" diameter, 150' deep, and has swl of 50'. How many gallons of water
are within this well column of water at the very bottom of this well? - ✔✔150 gal.
✔✔How many galloons are in a cubic foot? - ✔✔7.48
✔✔Water system pressure is expressed in? - ✔✔PSI
✔✔One cubic foot equals... - ✔✔7.4805 gallons
✔✔The difference between static water level and pumping water level in a well... - ✔✔...
is called the drawdown.
✔✔(T/F) Well development procedures should be able to clean the well so the sand
concentration in the water is below the maximum allowable limit set for particular water
use. - ✔✔True.
✔✔Well drilled using guar gums and several polymers can achieve better development
by using ________ mixes in the development water. - ✔✔Sodium or calcium
hypochlorite.
✔✔(T/F) Aquifer development is not an effective way to increase yields substantially. -
✔✔False.
✔✔ Artesian Pressure is generally... - ✔✔... a result of gravity and confining beds.
