Quiz 3: Domestic Well Coliform Test Results (0.25 CPD)

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Quiz 3: Domestic Well Coliform Test Results (0.25 CPD) - WQA Annual Education Kit Vol IX

70% correct required to pass (5 of 6 questions)

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1. Why is coliform bacteria a good indicator for potential pathogens?

1 point

a. The test is simple and inexpensive

b. It produces a noticeable odor

c. It's present in all untreated human & animal wastes

d. It produces a noticeable taste

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2. Why does repeated testing of the same well increase the likelihood of detecting coliforms?

1 point

a. More testing increases opportunity for operator error

b. Combination of low sample volume and low concentration often misses contamination

c. Additional samples allow bacteria to multiply, making detection easier

d. Additional tests often allow for cross-contamination and false positive results

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3. Why is additional testing for fecal coliform or E. coli necessary following a positive coliform result?

1 point

a. The tests for fecal coliform and E. coli are more sensitive to total bacteria

b. The coliform in the water may be due to harmless bacteria from soil rather than from fecal waste

c. A larger sample volume is needed to confirm fecal coliform and E. coli than the initial sample volume

d. Confirmation of fecal contaminantion is needed from a different lab than the lab testing for coliform.

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4. Which geological formation most contributed to the likelihood of coliform contamination?

1 point

a. igneus rock

b. limestone

c. clay

d. sand

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5. How many inches of rain within 10 days prior to well testing result in significant increase of fecal coliform?

1 point

a. 0.6

b. 1.4

c. 2.1

d. 3.5

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6. What is the significance of the finding that some fecal coliform and E. coli may not be from fecal waste sources?

1 point

a. Positive fecal coliform result may no longer correlate with fecal waste contamination of the well

b. A positive fecal coliform result becomes a clear indicator of deterioration of the well casing

c. A positive fecal coliform result is an indication of historic soil contamination

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