Thank you ALL for the replies!
So, I need to dig at least a foot to put the fence barrier. This brings me back to HOW DEEP should I make the SAND? AND can I count that in the one foot depth? I also plan to put a wire skirt around the edges - as deep as I can get it. I have a variety of scrap wire - chicken wire, hardware cloth, and goat fence.
I sure wish I could say that our burrowing critters were gone for the winter! Last month, I had to shut off the water for a repair. Below is a picture of what I found when I opened the well house! (picture was AFTER I had dug out the shut off valve!) Unfortunately, I was only able to put a wire skirt on 3 sides of the well house when I rebuilt it. I don't know where all the lines run and was scared I would damage something! Yesterday, I noticed that a critter had tried to dig in the well house, again - but the buried hardware cloth stopped them!
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I am not sure how many 80# bags of sand it would take to do both structures, but if I imagine laying the bags -unopened- I would say probably 10 bags per structure?? That's 20 bags. I have not found it for less than $6 a bag, but I will go with your $4 - that's still $80. Money is a HUGE obstacle with every project, but unless I am wrong about the amount of sand it will take...
I was unable to get any sand delivered today - so I guess my project is on hold until after Christmas.