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... abstraction boreholes were all drilled using 350 mm diameter percussion drilling equipment. A 125 mm od diameter plastic slotted well screen ( Figure 3) was installed in each borehole and a 1.9 -2.6 mm diameter washed gravel filter pack installed adjacent to the screened section ( Figure 4). Two bags of bentonite pellets were emplaced directly above the gravel pack, with cement grout added above the bentonite to approximately 4 m bgl. Figure 5 shows the construction details of the boreholes. ...
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