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NGWA GENERAL DRILLING EXAM (ACTUAL / ) STUDY
QUESTIONS AND VERIFIED CORRECT ANSWERS
Who is the most qualified person to design a well?Hydrogeologist.
In proper well design...... well screen intake velocity should be less than 1'/second
Reduced yield from a water-bearing formation can be caused by...... screen incrustation.
The diameter of a screen is not a critical factor in the specific capacity. Double the diameter of a screen generally increases the specific capacity by what percent?7% to 10%.
When drilling in an unfamiliar area, the collection of samples...... can enable the ground water professional to correlate formations from one area to another. 1 / 2
A well screen...
- Is a filtering device.
- Permits water to enter the well from the saturated aquifer.
- Precent sediment from entering the well.
(T/F) Gravel-packed wells should be sealed at the top of the gravel pack as well as in the annulus.True.
(T/F) Dry cement may be mixed with water in the annulus to form an acceptable surface seal.False.
Pressure grouting requires that the grout must be...... under sufficient pressure to drive it into the zone to be grouted.
When only 40' of cement is required to grout the surface casing, one can achieve a good seal by...
- / 2
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