– Karst water and fissure water in mountainous and hilly areas
A site background monitoring well is set in the upstream, 30–50 m from the landfill
boundary. Upstream springs with close hydraulic relation to the site, if any, can be
used for monitoring site background;
Four to five pollution diffusion monitoring wells are deployed in linear, T,
triangle or quadrilateral shapes. Linear-shaped monitoring wells are equally spaced
(less than 30 m) in the mountainous areas in the direction of groundwater flow.
Triangle or quadrilateral shaped monitoring wells are symmetrically distributed
along the direction of groundwater flow. Downstream springs, if any, can be used
for monitoring pollution diffusion.
The commonly used methods for such deployment are as illustrated in Figs. 2.10
and 2.11.
• Comprehensive disposal sites
A site background monitoring well is installed in the upstream of the site according
to the direction of groundwater flow. A pollution diffusion monitoring well is
installed in the downstream of each disposal unit. A pollution diffusion monitoring
well is laid in the downstream of the site, and where the landfill is located downstream of the site, the well can serve for both the landfill and the disposal site.
Fig. 2.9 Schematic diagram
of monitoring well layout in a
non-standard HWLF site
2.2 Content of Investigation
23
A site background monitoring well is set in the upstream, 30–50 m from the landfill
boundary. Upstream springs with close hydraulic relation to the site, if any, can be
used for monitoring site background;
Four to five pollution diffusion monitoring wells are deployed in linear, T,
triangle or quadrilateral shapes. Linear-shaped monitoring wells are equally spaced
(less than 30 m) in the mountainous areas in the direction of groundwater flow.
Triangle or quadrilateral shaped monitoring wells are symmetrically distributed
along the direction of groundwater flow. Downstream springs, if any, can be used
for monitoring pollution diffusion.
The commonly used methods for such deployment are as illustrated in Figs. 2.10
and 2.11.
• Comprehensive disposal sites
A site background monitoring well is installed in the upstream of the site according
to the direction of groundwater flow. A pollution diffusion monitoring well is
installed in the downstream of each disposal unit. A pollution diffusion monitoring
well is laid in the downstream of the site, and where the landfill is located downstream of the site, the well can serve for both the landfill and the disposal site.
Fig. 2.9 Schematic diagram
of monitoring well layout in a
non-standard HWLF site
2.2 Content of Investigation
23