EXAM THREE SOLUTIONS

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

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CE 280: Introduction to Environmental Engineering Exam 3 - 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 (60 points) 1. (8 points) What is an aquifer? (4 points) What is a confined aquifer? (4 points) An aquifer is a saturated geologic layer that is permeable enough to allow water to flow fairly easily through it. An aquifer sits on top a confining bed or an aquitard, which is a relatively impermeable layer that greatly restricts the movement of groundwater. Confined aquifers are sandwiched between two confining layers. Water in a confined aquifer can be under pressure. 2. (10 points) Define NAPLs (4 points). Define LNAPLs and DNAPs (4 points). Give two examples of NAPL compounds (1 point each). Non-aqueous phase liquids (NAPLs) are liquids that are not soluble in water. Because they do not mix with water, they form a separate phase. For example, oil is an NAPL. NAPLs can be lighter than water (LNAPL ) or denser than water ( DNAPL ). Hydrocarbons, such as oil and gasoline, and chlorinated solvents, such as trichloroethylene, are examples of NAPLs. 1
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EXAM THREE SOLUTIONS - Name _ CE 280: Introduction to...

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