This was a large structure, 270' wide x 570' long x 90' high, erected over a lined pit used to recover and  process contaminated soil.

Overhead doors, suitable for dump trucks and large equipment were installed without airlocks. Note several large fans next to the door that are used specifically to replace the air lost when the door is opened, and maintain inflation.

This was a temporary install secured to reusable anchors rather than a permanent foundation.