Thank you for your question.
My understanding of your question is that it's with respect to the impact on the biodiversity of forests and fauna, etc., and also about what is in the river's water chemistry and what processes we use.
We do open-pit mining, so we do strip all of the forests. We preserve all of the topsoil. We do our mining operations. When they are complete, we replace that topsoil and replant the trees. This process takes anywhere from 20 to 40 years. We have proven that we can do it. As I mentioned earlier, we've been in business long enough, for 30 years, to have fully reclaimed and returned re-certified land to the province. So I think that cycle works quite well.
To your other question, about river toxicity, remember that the river cuts through the Athabasca formation of oil sands. So the oil sands formation actually intersects the river, and has ever since the river started cutting through this region many millennia ago. So the toxicity level is a reflection of the riverbed, if you will, and we have no impact on that. The oil sands mining industry does not return any processed water whatsoever to the river. There are some sanitation water returns that happen, but that's the same as any municipality: it's treated water. But all the processed water is contained in our tailings ponds and we recycle it in our process. So we do not affect any of the river's chemistry and we only extract, on average, 1% of the river's flow.
I think our processes are fairly well proven. They are under strict scrutiny by the Alberta government and are monitored by two independent water panels.
While I'm at it, if I could, Mr. Chairman, I'll comment on a couple of other questions relating to water. To my knowledge, there have been no breaches of earth-filled dams at Syncrude or elsewhere, and if there have been, they've probably been very minor, which is why I've never heard of them. I've been in this business over ten years. The dams are closely monitored by geo-technical experts, both within industry and by outside third-party independents. We have wells drilled around all these tailings ponds so that we can monitor any flow through the ground. Through these wells and through interceptor ditches, we collect any leakage that comes from these dams and pump it back into the tailings ponds. So that water is maintained and continues to be recycled. Of course, as it evaporates it returns to the atmosphere quite cleanly that way.
In the long term, which Suncor has proved up, these tailings ponds do get filled with sand and sediment and are finally topped off with topsoil and reclaimed as well.
I'll perhaps leave my comment on that, but I'd be happy to comment on upgraders, if you like, as well as on creating wealth for the future from these vast operations.