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Hi Philip, I'd seen the videos before when researching the subject, but took a refresher look at them from your links. They give a better reasoned and supported account of the reality of fracking but are also, I'm afraid, not objective as they are sponsored/funded by the industry. However, having said that, our issues here are very different:
1) We are not fracking here
2) We have prior experience and objective data of aquifer contamination (which we also know, from objective data, is NOT irreversible) during the coal mining era.
What we need from COAG is a really detailed account of how they are going to seal the bores and prevent a new contamination of the ground water - because the only real issue here is to prevent the same errors of contamination of ground water that occurred over near 90 years of coal mining.
My personal view is that the test bore at Tilmanstone, sitting as it does right on top of the filled back mine shafts, presents a negligible risk for new contamination, but that the other two test bores may present a greater risk, so we really need the detail from COAG.