SUSTAINABILITY
David Mitchell constructed an extensive battery of pot kilns in response to the limitations of intermittent burning technologies, which enabled round the clock production.
Once the quarry is filled, the spoil will be left to settle for at least three years. The work is being undertaken under the supervision of the project geotechnical consultants Tonkin and Taylor. “There have been several similar developments on other quarries that are much shallower than this – maybe up to 40m deep,” Roger Olds, principal geotechnical
engineer at Tonkin and Taylor said. “They’re usually quite challenging in terms of getting the right materials and so forth. But this one is unique in the depth and the stresses that are applied to the soil at the base of the pit.” In an effort to forestall any problems, the ground is being over-compacted. As part of this process, a heavy-duty pump operates 24 hours a day, seven days a
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week, pumping 1.8 million litres of ground water per day. Ordinarily, soil needs to be compacted to 98 per cent density on commercial projects and 96 per cent on residential. But the soil at the former quarry is being compacted to a minimum of 101 per cent and an average of 103 per cent. Bayport has turned to Caterpillar, a supplier with which it has had a relationship with since the 1960s, to help it complete this unique project. Two Caterpillar 825K compactors and two Cat 19-tonne vibratory rollers – a CP76 padfoot and a smooth drum CS78 – are being used at the site to provide superior compaction as each layer of the quarry is filled to the specified density. Each compactor has a GPS record for ease of operation, helping operators to distinguish between areas that have been compacted and those that still require attention. There are also seven large Cat 773 50-tonne dump trucks carrying material from the top to the bottom of the quarry. The largest of the machines on-site is the Caterpillar 390F L hydraulic excavator,
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