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An Evaluation Technique for Ground Water Quality Beneath Urban Runoff Retention and Percolation Basins
Author(s) -
Nightingale Harry I.,
Harrison Doug,
Salo John E.
Publication year - 1985
Publication title -
groundwater monitoring and remediation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.677
H-Index - 47
eISSN - 1745-6592
pISSN - 1069-3629
DOI - 10.1111/j.1745-6592.1985.tb00919.x
Subject(s) - groundwater recharge , water table , groundwater , surface runoff , retention basin , head (geology) , environmental science , vadose zone , geology , hydrology (agriculture) , borehole , geotechnical engineering , aquifer , stormwater , geomorphology , ecology , biology
A subsurface water (vadose zone or ground water) extractor is described. Construction materials were Teflon and a porous ceramic suction cup. The unique features are: •Check valves are not needed. •Complete retention of water sample in a 1.8L capacity reservoir, even if vacuum is lost or when the reservoir is pressurized to transfer sample to ground surface and the collection bottle. •The extractor can usually be retrieved if the access well and well head as described are used. The ceramic cup can then be replaced if necessary and the extractor reused at another site. The water extractor is not suitable for obtaining samples for analysis of highly volatile pollutants. Up to four of these water extractors were used to monitor the quality of percolating urban runoff water and top of the ground water table (20 to 30m) beneath retention/recharge basins. The presence of water in the basins requires constructing a sealed borehole annular space, a watertight well head, and seal around the Teflon access tubes to the extractor at a control box containing the valves in the access tubes.