FWIW, I have a 100 lb Craftsman gravity feed sandblaster (plastic tank/box on wheels type) and I set up a catch basin in the back corner of my yard when I had to blast a number of smaller parts (axle housing, misc bracketry, valve covers, air cleaner, etc).
I placed a couple of saw horses in the corner near the fence, put a 5 gal bucket between them, then stapled a sheet of heavy plastic up to the fence on both sides and ran it over the saw horses and into the bucket. I think I had a milk carton crate (or something similar) between the saw horses where I could set objects during blasting. Anyway, most of the sand was caught by the plastic surround and dropped back to the bucket and I was able to recycle it through the blaster several times. It also saved making a huge mess in the backyard.
Sorry, I don't have a picture, but here's a quick sketch. The red lines/arrows in the sketch below represent the plastic I put up. I set the axle housing on the plastic between the saw horses. For smaller parts, I set a milk carton crate between the saw horses and set parts on it to be blasted.
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