Typical depleted UF₆ cylinder storage yard: Storage yards are large outdoor areas that typically have a gravel or concrete base. The cylinders are typically stacked two high in the yards. The bottom cylinders are placed on concrete or wooden chocks.

http://web.ead.anl.gov/uranium/faq/storage/images/faq18c.jpg archive copy at the Wayback Machine

From: http://web.ead.anl.gov/uranium/faq/storage/faq18.cfm archive copy at the Wayback Machine

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