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Site Consideration
Whenever possible,site selection should avoid areas where flooding or ground water pressure can occur.The lining”bottom”should be well above the water table.
If the site selected is in an area where organics are in the soil,or if gases can be generated by chemical reaction,the design must aloow for venting.
Surface Preparation
Surfaces should be level and free of all sharp rocks(all rocks and stone greater than 0.05diameter),objects,vegetation and stubble.(Soil sterilization may be necessary to kill roots and certain types of grasses.)
The subgrade surface should provide an unyielding foundation for the geomembrane with no sharp or abrupt chanages or break in grade.Proper compaction assures stability and support of the liner.
Groundwater Control
Groundwater should be taken into account and,if present,it will need to be controlled both during and after construction.
One method for controlling groundwater is to develop a drain system under the lining that allows the water to flow laterally under the lining without floating the lining.
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