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So, cap it with concrete. It's not quite the scale of the Hoover Dam. Recover expenses later, by selling the natural gas that would've otherwise burnt off.

How many cubic meters of gas have been wasted since 1971?

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I don't think this would work. you'd have to cap it long enough for the concrete to set. otherwise it'll bubble through and likely end up with a channel in the middle of the concrete that'll let the gas out anyway.

Concrete sounds too expensive anyways, just cap it with a big flame-proof tarp. Wouldn't cost more than $10k or $20k I'd imagine.

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