Environmental Engineering Reference
In-Depth Information
Botany Bay
Southlands
Botany
Industrial
Park
FIGURE 12.2
BIP and surrounds. (From Orica Ltd.)
CTC, and TCE. The hydraulic and chemical properties of the groundwater at
that location were confirmed by installing a large array of monitoring wells
upgradient, cross-gradient, and downgradient of the proposed pilot-scale
reactive iron barrier location. Several sacrificial wells were also installed in
the proposed location of the barrier, and were subsequently destroyed when
the barrier was constructed.
Predesign hydraulic characterization of the proposed pilot-scale site
comprised:
• Installation of nine wells up to a depth of approximately 4 m (fully
screened across the water table)
• Collection of water-level data to provide shallow groundwater flow
direction (to align the pilot-scale barrier perpendicular to the flow
regime)
• Installation of two multilevel wells to assess vertical gradients
• Detailed hydraulic testing of variation in aquifer permeability
• In situ groundwater velocity measurement using a velocity probe
• Electrical conductivity and γ-logs of the aquifer
Predesign geochemical characterization indicated that the upper 4 m of
the shallow aquifer was relatively clean, and that high concentrations of the
target CHCs were relatively consistent below 5 m.
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