| CPC B65G 65/42 (2013.01) [B65D 88/005 (2013.01); B65D 88/542 (2013.01); B62D 33/02 (2013.01); B65G 11/186 (2013.01); B65G 2201/045 (2013.01)] | 20 Claims |

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1. A method, comprising:
positioning a plurality of portable tunnel structures in a side-by-side configuration, wherein each portable tunnel structure includes a hopper having a rectangular storage area, and wherein the side-by-side configuration of the plurality of portable tunnel structures forms a collective storage area that is the sum of the first rectangular storage areas of each portable tunnel structure;
loading the plurality of portable tunnel structures with sand by dropping sand near a central point of the collective storage area until the sand forms a pile that extends across the plurality of portable tunnel structures; and
withdrawing sand through any of the portable tunnel structures by opening a gate that empties onto a conveyor that extends from a location below the gate within the tunnel to a delivery location outside the tunnel.
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