Re: sink hole/ground collapse
In nearly every case of a ground collapse, it is a result of water. In some cases, it's natural groundwater, but in many cases it's due to a leaky pipe -- either water or sewer.
You might call 811 and have them come out and locate any utilities in the area (it's a nationwide number and the service is free). Chances are, one of the utilities runs right through the affected area. Then call that utility and have them come out and look at it.
The "Senior Member" designation under my name doesn't mean I know a lot, it just means I talk a lot.I've been a DIYer since I was 12 (thanks, Dad!). I have read several books on various home improvement topics. I do not have any current code books I can refer to. I was an apprentice plumber for two years.