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Well drilling at Judkins

 

"At the Judkins landfill site near Nuneaton, with a quarry 90m deep and covering 35ha, Waste Recycling Group (WRG) needed to assess the yield and longevity of alternative permanent installation materials, such as HDPE and steel, during leachate extraction, and to test various gas and leachate well designs."

"Several wells were subsequently drilled in a difficult position on a bund some way up one side of the quarry. To construct the wells WRG appointed landfill drilling specialists FES, a company formed from an amalgamation of Foundation and Exploration Services Ltd and the nearshore and onshore geotechnical divisions of Fugro Ltd. FES drilled a total of 24 wells of 450mm diameter, ranging in depth from 15–55m using Casagrande B125 and CMV 3000 rotary drilling rigs. Both track-mounted machines use barrel-auger techniques capable of penetrating most landfill material."

 

"Drilling progress slowed dramatically, however, after 40m because of difficulties encountered including high leachate levels and ‘hard’ waste such as engine blocks and railway sleepers. At certain points the wells needed to be bailed out as drilling passed through unconsolidated and collapsing sand layers."

"The CMV 3000 uses conventional rotary landfill drilling methods for 200–450mm diameters and is capable of drilling to depths of over 65m. The Casagrande B125 offers fast penetration drilling up to 21⁄2 times faster than other landfill rigs. Capable of 750mm diameter and 35m deep wells, the rig is fitted with an electronic depth and vertical gauge which allows the operator to monitor the construction of the well as it proceeds and to accurately determine the final depth."

 

 

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