The ZK overhead line (OHL) running between Trawsfynydd Nuclear Power Station and Treuddyn Tee in North Wales was undergoing a long-term period of refurbishment. As part of the works assessments were required of the ground conditions at a number of tower locations. CGL was appointed to undertake an intrusive investigation comprising 13 combined percussive rotary boreholes into the bedrock, and 6 machine excavated tower leg foundation inspec

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