ENVB 210 Lecture Notes - Lecture 11: Leachate, Transpiration, Capillary Action
7 Feb 2018
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Document Summary
Before, landfill were just holes without sealing problems of contamination. Now we are better at detecting contaminants: the hole is sealed; use of methane recovery system; leachate collection system; wells monitor ground water to check the leaching. Pollution can enter soil systems as gas (vapor phase) Once capillary fringe reached water soluble pollutants are dispersed into ground water. If heavy, the insoluble pollutants will sink down and p(cid:271): we don"t really know where it ends. If density is less than water formation of a pollutant lens that floats on top of ground water and follows its variations. Pb: people tend to lose track of where were the waste disposal sites. If sea level remains constant + is charged from rainfall, the interfa(cid:272)e of salt water/ fresh water doesn"t (cid:272)hange. Pb: sea levels changes + pumping too much fresh water allows salt water intrusion in the wells. Note: the edge of land under water is porous.
