Change: relatively clean and safe to drink, having been filtered by the soil, sand, gravel, and rock that it percolated through on its way down to the   View changes from previous version. (Word count: 447)

Change: There were only format changes (bold, italics, etc.) in this version. See this version for details. (Word count: 446)

Change: in whichwhereby air is pumped into the water table, generating bubbles that flush out contaminants and enhance the growth of organisms that can break down the contaminants naturally. In-situ oxidation involves pumping an oxidizing agent, such as hydrogen peroxide,   View changes from previous version. (Word count: 446)

Change: known as a permeable reactive barrier, is effective only for shallow aquifers.Phytoremediation involves the use of plants and trees that are good at absorbing metals (e.g. Pb, U, Cd), metal-like   View changes from previous version. (Word count: 443)

Change: There were only format changes (bold, italics, etc.) in this version. See this version for details. (Word count: 420)

Change: Moved by lamontequinn Dec 8 2007, 5:40 PM EST

Change: Contaminant plumes can also be contained and removed by manipulating the flow of groundwater through pumps. By injecting clean water into the ground, pressure is created which directs the plume to a certain area for containment or pump for removal. This procedure, however, can be   View changes from previous version. (Word count: 413)

Change: There were only format changes (bold, italics, etc.) in this version. See this version for details. (Word count: 349)

Change: There were only format changes (bold, italics, etc.) in this version. See this version for details. (Word count: 349)

Change: Moved by lamontequinn Dec 7 2007, 2:09 PM EST