1. Groundwater most commonly exists in:

a) underground streams

b) springs

c) igneous rocks

d) aquifers


2. At any given time, the greatest quantity of fresh (non-saline) water on Earth exists in:

a) groundwater

b) fresh water lakes

c) rivers

d) atmosphere


3. The number of household water supply wells in the U.S. totals over:

a) 500,000

b) 1,000,000

c) 15,000,000

d) 100,000,000


4. What percent of the water used in the U.S. comes from underground sources?

a) 22 percent

b) 45 percent

c) 75 percent

d) 90 percent


5. Sources of groundwater contamination include:

a) storage tanks

b) abandoned wells

c) encroachment caused by well water pumping

d) irrigation water


6. The concentration of chlorine recommended for shock disinfecting a well is:

a) 1 ppm

b) 25 ppm

c) 50 ppm

d) 100 ppm


7. To obtain a higher available chlorine concentration, calcium hypochlorite can be mixed together with sodium hypochlorite?

(True or False)


8. How much sodium hypochlorite bleach is required to dose a well at 100 milligrams per liter (mg/L) or parts per million (ppm) of available chlorine? The well casing diameter is 6 inches and the length of the water-filled casing is 45 feet. Sodium hypochlorite bleach is 5.25 percent of 52,500 mg/L available chlorine.

a) Two cups

b) Two pints

c) Two quarts

d) Two gallons


9. Check valves are installed on the discharge side of a centrifugal well pump. 

(True or False)


10. In a multi-stage centrifugal water pump, the function of each stage is to add flow capacity or additional gallons of water. 

(True or False)