Depth and temporal variations in water quality of the Snake River Plain aquifer in well USGS-59 near the Idaho Chemical Processing Plant at the Idaho National Engineering and Environmental Laboratory Page: 4 of 63
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ABSTRACT
In-situ measurements of the specific conductance and temperature of ground water in the
Snake River Plain aquifer were collected in observation well USGS-59 near the Idaho Chemical
Processing Plant at the Idaho National Engineering and Environmental Laboratory. These
parameters were monitored at various depths in the aquifer from October 1994 to August 1995.
The specific conductance of ground water in well USGS-59, as measured in the borehole,
ranged from about 450 to 900 pS/cm at standard temperature (250 C). The pumping cycle of the
production wells at the Idaho Chemical Processing Plant causes changes in borehole circulation
patterns, and as a result the specific conductance of ground water at some depths in the well
varies by up to 50% over a period of about 14 hours. However, these variations were not
observed at all depths, or during each pumping cycle. The temperature of ground water in the
well was typically between 12.8 and 13.80 C.
The results of this study indicate that temporal variations in specific conductance of the
ground water at this location are caused by an external stress on the aquifer - pumping of a
production well approximately 4000 feet away. These variations are believed to result from
vertical stratification of water quality in the aquifer and a subsequent change in intrawell flow
related to pumping. When sampling techniques that do not induce a stress on the aquifer (i.e.
thief sampling) are used, knowledge of external stresses on the system at the time of sampling
may aid in the interpretation of geochemical data.ii
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Frederick, David B. & Johnson, Gary S. Depth and temporal variations in water quality of the Snake River Plain aquifer in well USGS-59 near the Idaho Chemical Processing Plant at the Idaho National Engineering and Environmental Laboratory, report, March 1, 1997; United States. (https://digital.library.unt.edu/ark:/67531/metadc680748/m1/4/: accessed April 25, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.