Excavation needed in 2017. It appears that this rubble deposit fills what used to be the location of a second step up from the floor surface present in i4. Whether the step was robbed out for use elsewhere is not immediately certain but there most certainly would have been a step in this location at a previous phase of habitation, based on the difference in elevation between threshold 8019 and step 8073. The accumulation of tufo based rubble covers in part the step below and may have been intended to allow continued access up to the floor in i2, if some kind of surface once covered it. It is not clear at this time whether the fill dates exactly to the time of the phase of the industrial use or before or even after.