EXAM TWO SOLUTIONS - Name _ CE 280: Introduction to...

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Name ____________________________ CE 280: Introduction to Environmental Engineering Exam 2 – Spring 2008 Closed Book Exam Do all work on the exam pages. If you need more space, use the page at the end and indicate that your work carries over. QUESTIONS (40 points) 1. (4 points) List the four components of risk assessment. The four components of risk assessment are: a. Hazard identification: b. Exposure assessment: c. Dose-Response or Toxicity Assessment: d. Risk characterization: 2. (6 points) Which of the compounds in the following graph is more toxic (3 points). What is the definition of LD 50 (3 points). Compound A is more toxic because its LD 50 value is much smaller than that of compound B.
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Name ____________________________ Lethal Dose LD 50 is the amount required to kill 50% of a population. 3. (4 points) What is the biggest sink for Carbon on planet earth (2 points)? Name the two pumps that are responsible for removal of carbon from atmosphere into the oceans (2 points)? Oceans are the largest sinks of carbon on planet earth. The two pumps responsible for removal of carbon from atmosphere are: a. Solubility pump b. Biological pumps 4. (5 points) Nitrogen exists in different forms in terrestrial environment. List five different forms of nitrogen. Atmosphere is the main reservoir of nitrogen where it exists in the form of nitrogen gas (N 2). N 2 is converted to biologically available forms naturally by nitrogen-fixing organisms and anthropogenically by combustion. Nitrogen cycles between NO 3 - , NO 2 - , NH 3 , and organic-N by different organism. N 2 is returned to atmosphere by denitrification under anaerobic conditions.
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Name ____________________________ 5. (4 points) Define point source and non-point source pollution (2 points). Which one of the two is regulated under Clean Water Act (3 point)? Point source pollution includes wastes that are collected in pipes
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This note was uploaded on 05/12/2008 for the course CE 280 taught by Professor Xagoraraki during the Spring '08 term at Michigan State University.

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EXAM TWO SOLUTIONS - Name _ CE 280: Introduction to...

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