I worked for a water well drilling company for several years.
I have drilled wells with pounders.
They do work in many sandy soils.
Depending on how much the sand sticks together, they may work well or not.
Drilling mud and other fluids can make drilling (pounding) through sand easier even where conventional drilling has trouble.
But. The sand you see is probably only a few feed deep, what is below that may make or break the effort.
A Cable Tool (water well driver) does not do well in some subsoils. Gravel for example. Or very hard shale. Twist drills ( called a conventional) are a far better option in those soils.
A call to a local water well company may reveal what sub soils you may be dealing with.
Then again they may not tell you in the hopes that your effort fails and you have to call them to finish the job.
Not all water well companies are good neighbors.
As a rule of thumb, pounders will work almost anywhere a convention drill will but they can be slower.
On the plus side they are generally cheaper to operate and so charge less per foot drilled.
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