Steve - that's the same area where TerraX was wheeling at night, and is the same area as the Laborde site. The concrete structures you saw were probably part of Laborde. In the image on your link, there's a wide dirt road toward the left side of the image that runs north-south in a pretty straight line. Toward the bottom of that road in the image is the first concrete slab related to the site, which was the assembly factory. If you follow that road south a little (scroll in the image), you'll see a bunch more concrete pads where other buildings used to be.