hha_March15_17 - Notes for March 14 and 16: Monday (March...

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1 Notes for March 14 and 16: Monday (March 14 th ) • Threats to Groundwater Quality Weds (March 16 th ): •Qu iz • Threats to Groundwater Quality (continued) • 3 presentations Presentation notes due to me by end of either Friday (for Mon presentations) or Monday (for Weds presentation) so that I can post them for the class. Ground water contamination Sources saltwater intrusion acid mine drainage animal wastes leaky underground tanks/pipelines Common contaminants: - dissolved solids sulfuric acid - bacterias/viruses -n metals tanks/pipelines septic systems agriculture municipal landfills industrial wastes - metals - petroleum products -insecticides/herbicides - manufactured organic chemicals Natural contaminants • Dissolved Solids: salt water intrusion or mineralized groundwater • Trace contaminants: examples, radium, arsenic, selenium • Arsenic in private wells (drinking water standard 10 ug/L) • Example of Selenium (Se): Vital trace nutrient, but toxic in high quantities • Iron Selenide, FeSe 2 naturally occurs in sediments of the San Joaquin valley • Kesterson Reservoir was constructed to evaporate agricultural drainage from irrigation – 1980s: Large die-offs of migratory birds, impacts on livestock Reservoir closed as a toxic waste site
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2 Major Contaminant Sources: Leaky underground storage tanks : Gasoline and other petroleum products Prevention: new tanks, monitoring Septic tanks : nitrates, bacteria/viruses, household chemicals Agriculture/Lawns : Insecticides, herbicides, pesticides, nutrients (N and P) Landfills : leachate can infiltrate into groundwater Industrial sites: spills or improperly disposed chemical waste. • cleaning solvents and degreasers (synthetic organics) • trace metals (lead, cadmium, mercury) Most contaminant sources on/near surface Aquifer vulnerability depends on: • depth to water (>depth, more time for reactions,
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This note was uploaded on 10/19/2011 for the course GLY 3882 taught by Professor Screaton during the Spring '09 term at University of Florida.

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hha_March15_17 - Notes for March 14 and 16: Monday (March...

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