affected by precipitation and change with seasons, and the dynamic instability
coefficient is greater than 20. In the absence of relatively water-proof roof, the
groundwater is unstable and shows hysteresis to certain extent. In the study area, the
groundwater moves along the slope from the top of mountains to the foot of
mountains, and it is drained on the land surface at the foot of mountains and merged
into the Dongsheng River.
• Groundwater table changes
The change of groundwater table in the study area is closely related to precipitation
because groundwater changes in a dynamic manner under the impact of precipitation. Given this, the groundwater table is monitored at six monitoring wells in
both wet and dry seasons, and the aquifer embraces the formation of fracture zone.
According to the Report on 1/200,000 Regional Hydrogeological Survey (Pengze),
the groundwater in the study area is transported along the slope and discharged to
the land surface via spring at the foot of mountains. Therefore, the groundwater in
the study area overall flows from the upstream landfill to downstream river, which
is consistent with water tables measured on-site at monitoring wells. The maximum
and minimum depth to water table during the wet season is measured to be 7.78 m
and 1.72 m respectively, making an average of 4.05 m. During the dry season, the
depth to water table ranges from 1.27 to 6.12 m and averages 3.63 m. It is obvious
that groundwater is sharply different during wet and dry seasons due to the significant influence of the external environment.
(2) Environmental background investigation of the landfill
(a) Landfill overview
The X271 County Road runs on the east side of the landfill and a river flows
through the study area less than 100 m away from the landfill. According to local
villagers, the landfill was built on a reservoir by the government in 1998 as the
predecessor suffered perennial water shortage (Fig. 5.10). The landfill remains
open, and trucks with a capacity of 8 tons each transport different types of waste to
the landfill every 10 min. According to incomplete statistics, the landfill currently
covers an area of about 150 m
2 and the landfill volume approximately reaches
2250 m
3 which is oval in shape. The waste is stocked in the open air without any
seepage control and cover (Fig. 5.11).
(b) Types of waste
According to the detailed plan for implementing the provincial MSW classification
system in the study area, hazardous waste must be classified, and other wastes
should be gradually classified. The categories for mandatory classification will be
determined according the MSW classification and evaluation criteria and prescribed
by the municipal governments. Waste not covered by the classification system will
be disposed of pursuant to the prevailing measures, as shown in Table 5.14.
Based on visits and investigations into local towns and villages, waste is landfill
is further divided into four categories:
118
5 Application Cases
coefficient is greater than 20. In the absence of relatively water-proof roof, the
groundwater is unstable and shows hysteresis to certain extent. In the study area, the
groundwater moves along the slope from the top of mountains to the foot of
mountains, and it is drained on the land surface at the foot of mountains and merged
into the Dongsheng River.
• Groundwater table changes
The change of groundwater table in the study area is closely related to precipitation
because groundwater changes in a dynamic manner under the impact of precipitation. Given this, the groundwater table is monitored at six monitoring wells in
both wet and dry seasons, and the aquifer embraces the formation of fracture zone.
According to the Report on 1/200,000 Regional Hydrogeological Survey (Pengze),
the groundwater in the study area is transported along the slope and discharged to
the land surface via spring at the foot of mountains. Therefore, the groundwater in
the study area overall flows from the upstream landfill to downstream river, which
is consistent with water tables measured on-site at monitoring wells. The maximum
and minimum depth to water table during the wet season is measured to be 7.78 m
and 1.72 m respectively, making an average of 4.05 m. During the dry season, the
depth to water table ranges from 1.27 to 6.12 m and averages 3.63 m. It is obvious
that groundwater is sharply different during wet and dry seasons due to the significant influence of the external environment.
(2) Environmental background investigation of the landfill
(a) Landfill overview
The X271 County Road runs on the east side of the landfill and a river flows
through the study area less than 100 m away from the landfill. According to local
villagers, the landfill was built on a reservoir by the government in 1998 as the
predecessor suffered perennial water shortage (Fig. 5.10). The landfill remains
open, and trucks with a capacity of 8 tons each transport different types of waste to
the landfill every 10 min. According to incomplete statistics, the landfill currently
covers an area of about 150 m
2 and the landfill volume approximately reaches
2250 m
3 which is oval in shape. The waste is stocked in the open air without any
seepage control and cover (Fig. 5.11).
(b) Types of waste
According to the detailed plan for implementing the provincial MSW classification
system in the study area, hazardous waste must be classified, and other wastes
should be gradually classified. The categories for mandatory classification will be
determined according the MSW classification and evaluation criteria and prescribed
by the municipal governments. Waste not covered by the classification system will
be disposed of pursuant to the prevailing measures, as shown in Table 5.14.
Based on visits and investigations into local towns and villages, waste is landfill
is further divided into four categories:
118
5 Application Cases