EP 1110-1-27
27 Jan 00
oxidative Eh. Erratic detections or spikes of compounds whose solubility is redox- or pH-
sensitive may occur.
Metal oxide breakthrough from filters into the rest of the treatment train. Acidic waters may
flush attached iron and other metal oxides from filter particle surfaces, and breakthrough may
occur, resulting in coating of downstream media and membranes.
Enhanced cost of operation due to lowered efficiencies and frequent cleaning, backwashing,
or replacement of media.
b. Input and output effects. The effects include:
Pumping well and system clogging, which restricts flow so that cleanup of calculated plume
volume is slowed or stopped, or contaminated ground water bypasses the installed system
while wells are replaced or rehabilitated.
Altered aquifer hydraulic conductivity so that the plume bypasses the pumping well array,
favoring higher-hydraulic conductivity channels less affected by biofouling.
If injection wells cannot take enough water, the plant has to cut back or shut down.
c. Institutional loss of confidence in pump-and-treat strategies. This effect is already apparent in
the literature and discussion groups when "pump and treat" is discussed. Arguably, a contributing factor
in poor performance in these systems is performance deterioration due to environmental factors such as
biofouling that can be addressed through well system PM (Smith 1995; Alford and Cullimore 1999).
4-6
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