1 cm
30 cm
VIL
M F
MDP
BAT
195
Reactive (Oxygen) Gas Barrier and Zone Technologies
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
FIGURE 10.8
Groundwater monitoring devices for RGBZ. (VIL—loosen sonic lance filter; MF small diameter observation well; MDP—loosen double-valve pneumatic pump; BAT pressure conserving
bailer shuttle).