SCH 3U
Name: ______________________________
WATER ASSIGNMENT
Date: ______________________
(44 MARKS)
DRINKING WATER
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4.
List the three categories of contaminants and give at least two examples of each. (3 marks)
What does MAC stand for? ( 1 mark)
List four ways in which contaminants may enter ground water or surface water. (4 marks)
What is the most important step in freshwater treatment? (2 marks)
LESSONS FROM THE PAST: THE WALKERTON TRAGEDY
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What happened in Walkerton, ON in the spring in 2000? (2 marks)
An inquiry was held to determine what went wrong in Walkerton. What did it conclude? (3
marks)
What recommendations did the inquiry recommend to ensure this tragedy doesn’t happen again?
(2 marks)
What lessons should be taken from this tragedy? (2 marks)
WASTE WATER TREATMENT (pp. 371-374)
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2.
3.
What is sewage? (2 marks)
What does BOD stand for? What are the effects of a high BOD? (4 marks)
Describe the three stages of waste water treatment. (6 marks)
CURRENT ISSUES: DRUGS IN DRINKING WATER
Research and answer the questions below
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4.
Identify two ways in which we unintentionally contaminate our water with medications. (4
marks)
Why were medications in drinking water only discovered recently? (3 marks)
Why is it not feasible to remove all traces of medication from drinking water? (2 marks)
What simple steps can you take to reduce drug contamination in drinking water? (4 marks)