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Reducing the Influence of Skin Effects on Hydraulic Conductivity Determinations in Multilevel Samplers Installed with Direct Push Methods
Author(s) -
Henebry Brent J.,
Robbins Gary A.
Publication year - 2000
Publication title -
groundwater
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.84
H-Index - 94
eISSN - 1745-6584
pISSN - 0017-467X
DOI - 10.1111/j.1745-6584.2000.tb00687.x
Subject(s) - hydraulic conductivity , slug test , environmental science , conductivity , soil science , chemistry , soil water
Field tests were conducted to investigate skin effects in multilevel ground water samplers installed with direct push methods. Tests consisted of determining hydraulic conductivity values using slug tests in five multilevel samplers before, during, and after development. Development was conducted using a minisurge block tool designed for this study. Post‐development hydraulic conductivity values were found to be 3.2 to 9.6 times greater than predevelopment values. The largest differences were observed in multilevel samplers positioned in low permeable materials that were installed in preprobed holes advanced by hydraulic hammering and pushing as opposed to probes situated in higher permeable materials that were installed in cored holes. The presence and magnitude of the skin effects, as well as the reduction of these effects by rigorous development, were confirmed through comparisons with steady‐state pumping tests conducted in multilevel samplers and previously conducted slug tests in conventional monitoring wells. These results indicate the need for rigorous development prior to hydraulic conductivity testing in ground water samplers installed with direct push methods.