Has anyone ever had a GPR (ground penetrating radar) geological survey performed?
The soil conservationist who has been helping me with my pond design has stated that I must not hit bedrock, as that is like adding a drain to the bottom of your pond.
I dug the basin 15 ft deep, but if I want coldwater fish of some type, I need to get to at least 20 ft deep. He told me to keep a minimum of 2 ft of glacial till between the bottom of the pond and bedrock.
I really don't have a place to dig a 25 ft deep test hole to look for bedrock, nor do I want to waste the diesel fuel to do that.
I was hoping I could get a GPR survey done. The radar's look almost like little push mowers, and I only need a small area surveyed.
I have contacted a the place that did my survey, as well as a few other places, but can't seem to come up with anyone who even has the equipment.
Oh, and yes I did think of core drilling, but that looks more costly to do than just wheeling a radar over the ground. Plus I have a lot of large rocks in the glacial till, undoubtedly you'd be drilling more than one hole due to all the rocks down there...
Any ideas?
Here is a company who manufactures the units:
GSSI 
