For example, a project with construction debris and old brick walls under an asphalt parking lot. Sonic tubes are not suitable for this and we’re running into major issues.
It’s interesting that you’re asking this question now; we’re working on this exact situation today, again in Queens, New York, on another site. So, generally, what we’re using on that site is a spread footer solution, which goes less deep and it is obviously not our go-to solution because it’s a little bit more expensive, but depending on what you have there, it could work.
I strongly suggest is you send us whatever Geotech information you have, any pictures you have of what’s there, and definitely get it into our team to be able to provide you with some possible solutions.