Where Desert Sand Comes From

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Discarded right next to where we parked the truck was this odd refuse. I couldn't resist recording it for posterity as I was unable to concoct a logical reason for it being there. So the challenge is this... Why would anyone bring sand to the desert? The bag is sealed indicating it was purchased elsewhere and transported 5 miles off road into nowhere. And it isn't just a single bag. I counted 4, 80 lb. sacks.

Anyone turning in the correct answer wins a free at-a-boy. E-mail me your guess. I will publish the best of the lot on the web.