Quiz 3 Flashcards
Where do most people get their drinking water from?
Groundwater wells
Johnson water is ____ water
Well
What does an unconfined aquifer have?
No impermeable lay between its water and the ground surface
What is a confined aquifer contained by?
Impermeable layers of rock or soil
What does a cone of depression do?
Lowers the water table around a pumping well that could result in more contaminants moving toward the well
What are some major categories of groundwater contamination?
Agriculture, industries, septic and sewers, road salt, and uncontrolled hazardous waste
What does LUST stand for?
Leaky underground storage tanks
What is CERLCA?
A legislation passed in the 1980s to clean up highly contaminated sites in the US (which are referred to as Superfund sites)
What are some of Vermont’s Superfund sites?
Old landfills, abandoned mines, or tanneries
Why is groundwater remediation difficult?
It is hard to pinpoint and access the pollution plumes
What are the two ways of treating groundwater?
In-situ (on site) or ex-situ (off site)
What can groundwater remediation include?
Dispersion, dilution, transformation, or destruction of contaminants
Why was there lead in the water of Flint, Michigan?
They changed water sources and did not add anti corrosive agents to the water which broke the bacterial film and began to Leach lead from the pipes into the water
What are the steps for treating surface water?
1) large filter 2) add coagulant to bind small particles together 3) settle out particles 4) filter with carbon, sand, and gravel 5) adjust the pH 6) add anti corrosive agent 7) add chlorination (sometimes need to de-chlorinate)
What are PFAS?
Chemicals that can take a thousand years to break down in nature; often referred to as forever chemicals
