NGWA - Study Questions - General
Drilling Exam
Artesian Pressure is generally... - ANSWER-... a result of gravity and confining beds.
What is true about the origin of rocks? - ANSWER-1. Sandstones were once sand deposits and could have
been river sand, beach sands, or dune sands.
2. Some limestones contain fossils because they were once the mucky bottoms of shallow seas.
3. Shales were once clay beds.
Sedimentary formations may reach depths of a mile or more.
(T/F) Ground water, like surface water, has a tendency to flow downhill. - ANSWER-True.
The three main types of rock are... - ANSWER-... igneous, sedimentary, and metamorphic.
Water would be least likely found in what geological formation? - ANSWER-Granite.
(T/F) More than 90% of our nation's fresh water is underground? - ANSWER-True.
Prior to setting the rig, you should... - ANSWER-1. Make sure there are no overhead power lines within at
least 20' of the mast.
2. Locate all buried materials.
3. Verify you are on the right property and meet the correct setback requirements.
Confined space entry rules require... - ANSWER-1. Shoring of trench walls over 4' deep.
2. Establishment of buddy system.
3. Have driller's assistant check jacks as operator levels rig.
In setting up and leveling the rig, the right procedure is to... - ANSWER-1. Use suitable jack pads for
stabilization.
2. Position rig for minimum leveling.
3. Have driller's assistant check jacks as operator levels rig.
(T/F) A well may be used as sewage disposal site only if it is cased to the bottom of the borehole. -
ANSWER-False.
When considering the well site, the more important thing to consider is the... - ANSWER-... place where
it is least likely to be contaminated.
Air forced down the drill pipe... - ANSWER-... clears drill cuttings.
The best method to drill a domestic water supply well in cavernous hard rock would be... - ANSWER-...
cable tool.
