4/11 ERS102 - Groundwater Contamination Important Concepts...

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Groundwater Contamination Important Concepts o Point source vs. non point source Contamination o Sources of contaminations in Maine o How contamination moves o Remediation Groundwater contamination -There are many sources of groundwater contamination -Pollution is often not recognized until damage occurs -Groundwater cleanup is slow, expensive and limited -Point Source -Groundwater contaminant plumes changes over time -They grow in length with groundwater flow -They grow in width by diffusion and dispersion -Large plumes pollute large areas and effect many people -For Maine Point Source Contamination has often meant leaking gas tanks and MBTE -MBTE: Gasoline Additive -Into groundwater by: spills while fueling and leaking tanks -Both Gasoline and MBTE extremely difficult to remove. Contamination requires replacing water supply -Non-point sources: contaminates contributed from wide area -Radon: colorless, odorless gas produced by radioactive decay of uranium.
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