Easty wrote:
Any builder people explain what the black stuff going down where the stand will be built is?
It could be a geotextile membrane given they appear to be putting hardcore/6F2 fill over the top of it. In layman's terms it is 'reinforcement' for the ground to improve the ground bearing pressure for a ground-bearing floor slab or possibly to improve the ground bearing for the piling rig, piling mat if the ground is really poor. You mentioned they were piling for the founds, so depending on the state of the ground it could be for either.