a before & after concrete slab survey... The Bristol Port Company requested a Level Survey across a concrete slab in one of their warehouses. The previous tenants had moved out so the warehouse was empty bar a few stacking racks on the east side. The purpose of the survey was to compare the data to that of a second survey which would be completed once the new tenants had moved their stock into the warehouse. A 3m grid was taken across the 90mx90m slab. By comparing the data f