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

This image is a work of a United States Department of Energy (or predecessor organization) employee, taken or made as part of that person's official duties. As a work of the U.S. federal government, the image is in the public domain. Please note that national laboratories operate under varying licences and some are not free. Check the site policies of any national lab before crediting it with this tag. العربية ∙ Deutsch ∙ English ∙ français ∙ 日本語 ∙ македонски ∙ മലയാളം ∙ Nederlands ∙ русский ∙ українська ∙ Tiếng Việt ∙ 中文（简体） ∙ 中文（繁體） ∙ +/−