Ngwa general driller

Comprehensive NGWA general drilling exam preparation featuring verified true/false and multiple-choice questions covering drilling fluids, well design, pressure systems, rig safety, aquifer development, grouting, and geology.

Define aquifer - Answer saturated geologic unit that can store transmit and yield groundwater in sufficient quantity to constitute a usable supply What is the upper boundary in an unconfined aquifer - Answer water table What is the lower boundary in an unconfined aquifer - Answer impervious layer What is the potentiometric surface - Answer the height the water could potentially rise to if the confined aquifer is tapped by a well When do flowing artesian conditions occur -...

A watercourse that flows continuously at all times of the year is known as what? - Answer Perennial stream What is defined as 'the killing or inactivation of pathogenic organisms in water'? - Answer Disinfection Free chlorine residual values are based on a contact time of how long? - Answer 10 mins What time of day does algae cause the pH of the water decrease? - Answer Night time What contributes to the creation of algae blooms? - Answer Increased nutrients W...

The primary item which dictates the type of drilling equipment to be used on a site is... - Answer ... geology. 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. Which is NOT a component of a monitoring well rig? - Answer Mud pump. What is the minimum size hollow-stem auger, casing, or borehole used for i...

Artesian Pressure is generally... - ANS ... a result of gravity and confining beds. What is true about the origin of rocks? - ANS 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. - ANS True...

Comprehensive study guide for NGWA certification covering air rotary systems, drilling techniques, bit selection, down pressure, surfactants, and pressure-volume requirements. Includes accurate answers to high-yield technical questions.

Comprehensive NGWA exam preparation covering groundwater monitoring, well design, drilling methods, mud rotary and air rotary systems, screen installation, and drilling fluid management with verified answers.

Groundwater - Answer - Is water found in the pores of soil and sediment, plus narrow fractures in bedrock. - The largest reservoir of freshwater that is readily available to humans. - 6/10 of 1% of the hydrosphere is groundwater. Most Use of Groundwater - Answer 1. Toilets. 2. Clothes Washers. 3. Showers and Baths. 4. Faucets. 5. Leaks. 6. Other. 7. Dishwashers. Precipitation - Answer - Any form of water that falls from clouds and reaches Earth's surface. - Most ...

American National Standards Institute (ANSI) - Answer Who is the third-party group that approves and endorses standards? Standards - Answer What term is used to describe the documents written by members, or peers, in the industry. Industry Standards - Answer Company's Health, Safety and Environment policy should be a combination of Labor Regulations and _________? Employer - Answer Where OSHA has not promulgated specific standards, who is responsible for following the act...

American Hospital Association (AHA) - Answer Non profit group or alliance of member hospitals and health care organizations that promote the interests of hospitals. It is an advocacy group for health care organizations, particularly hospitals American Medical Association (AMA) - Answer The national professional membership organization for physicians that distributes scientific information to its members and the public, informs members of legislation related to health and medicine, and r...