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Sediment Sump (As Appropriate)

FIG. 9.15.3 Typical monitoring well design and construction detail. (Reprinted from U.S. Environmental Protection Agency, 1993, Subsurface characterization and monitoring techniques, a desk reference guide, Vol. 1, USEPA/625/R-93/003a [May] U.S. EPA.)

upgradient of the source and detect or monitor any contaminant plumes emanating from the source.

In a remedial investigation, however, the preliminary selection of the location and number of wells needed to delineate and monitor the plume is usually based on the results of initial field screening techniques such as gas surveys, HydroPunch, geophysical surveys, and borings. Environmental engineers use the data from these investigations to estimate the extent of the contaminant plume and establish the basic hydrogeologic parameters of the site. Once the hydrogeology of the site is understood and the migration path of the suspected contaminant plume is established, the location and number of wells can be finalized. In general, the more complicated the hydrogeol-ogy, the more complex the migration path of the contaminant plume and the greater the number of required monitoring wells (Barcelona et al. 1990).

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