Shot Rock first (very large boulders from the quarry before being crushed or sorted)

Then large 12" type stone

Then smaller riprap sizes

Then layer of thick geotextile fabric

Then dirt/topsoil.

quote:

Originally posted by sig229-SAS:
Do you know anyone that has a good drone? Maybe a real estate professional? You could at least get a feel for size, but lack of control could be an issue if it goes to far down.

No, but I know an amateur splunker that has offered to go down and take a look. Only thing is he promised he would do it two years ago but hasn't. I need to jack him up!

quote:

Originally posted by SBrooks:
Shot Rock first (very large boulders from the quarry before being crushed or sorted)

Hard to judge but it looks like the hole at its smallest point where it curves out of sight at the bottom is still 4 to 6 feet in diameter. I wasn't sure I could get big enough stone hauled to jam that up... they might just keep going!

Treatment before a proper diagnosis is generally a bad idea. Applies to sink holes as well.

I have an ex wife that might be able to plug up that hole. But then again, you’d have more problems with a hole that would never stop yapping and nagging.

quote:

Originally posted by cparktd:
1) My Brother is married to the sister of the wife of the official Surveyor for the City and his Dad was the city Civil Engineer for decades.

This reminded me of Ferris Bueller’s Day Off...

They built a Publix on top of a very large sinkhole behind my old house . They trucked in literally thousands of loads of dirt and concrete for a month to fill that thing. It’s really a shame beciase for Florida, it was massive, probably 500 feet across and 20 feet deep to the water level below (unknown how deep). It was a one of a kind sinkhole, never seen anything like it, and they dumped a ton of rock and dirt and cement into it to build a grocery store.

I talked to one of the heavy equipment tractor operators and he was flabbergasted that a large corporation would chose such a site , and thought it was too risky, which mirrored my thoughts as well.