Abstract
AbstractThis study provides a comparison of water quality profiles taken within the screened interval of five shallow monitoring wells and those obtained from adjacent multilevel sampler clusters. Parameters compared are oxidation‐reduction potential, electrical conductivity, temperature, methylotertiary‐butyl ether (MTBE) concentrations, and chloride concentrations. The constituents were found to be relatively constant with depth within the monitoring wells, despite large variations observed with depth in the discrete samplers. Parameter homogenization in the wellbores can be explained by vertical flow conditions, as revealed by hydraulic head measurements in the multilevel samplers. The results suggest that sampling conventional shallow monitoring wells with active or passive samplers at different depths within a well screen will not provide an accurate indication of how constituents may vary in the adjacent formation with depth.
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