Environmental Engineering Reference
In-Depth Information
automatic off switch are needed for the gas tanks and supply system. When
dealing with volatile hazardous contaminants or potentially explosive gas
mixtures, gas warning devices and a soil gas venting system are required.
10.3.3 Monitoring Devices
The main functions of a RGBZ monitoring system are: (1) the detection of
gas emissions at geological weak points, nontight boreholes, and soundings;
(2) representative sampling of groundwater and soil gas; (3) detection of gas
distribution and dimensions (ROI) of the RGBZ; (4) estimations of injection
gas propagation and dissolution; and (5) estimation of local gas saturations
in crucial regions and layers.
10.3.3.1 Groundwater and Dissolved Gas Monitoring
Groundwater sampling equipment can be installed using self-grouting
direct push technology. Special filters and pumps are required due to small
diameters and gas-protected filter screens (Figure 10.8). Sampling using
1 cm
VIL
MF
MDP
BAT
FIGURE 10.8
Groundwater monitoring devices for RGBZ. (VIL—loosen sonic lance filter; MF small diam-
eter observation well; MDP—loosen double-valve pneumatic pump; BAT pressure conserving
bailer shuttle).
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