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Thanks for the advice guys, but the manhole access is to a tank which is approx 8ft deep, 6ft wide, and 10ft long. I'd need quite alot of hardcore for that.

Thanks for the reply new boy. What's the best way for me to cover the hole while I fill it with concrete?

New here so be gentle. Behind our house we've got an old underground rain water tank. The access into the tank is via a manhole. The tank has been pumped empty, back filled with various rubble, and all filling sources diverted. I'm wanting to permenantly seal the tank up, and my plan is to...