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Safedem then decided to trial explosive blasting followed by mechanical demolition. A number of 30 mm (1.2 in) diameter holes were drilled in a 1 m (3.3 ft) centre grid formation over areas up to 100 m2 (1,076 ft2), drilled to a depth of 2.2 m (7.2 ft) into the top three concrete layers of the roof. Because of the very heavy reinforcement in the concrete,Cheap Jerseys, this proved difficult and expensive due to breakage of drill rods and the high wear factor of drill bits.
During trial blasting, seismic monitoring was carried out to determine air over pressure and vibration levels. Various locations across the site were selected for this monitoring and in particular at positions immediately adjacent to the nearby residential homes. From the results, Safedem agreed with the local authority that the maximum weight of charge for each future blast would not exceed 25 kg (55 lb).