After further study, it is apparent that this is one of a series of preparation levels which had the function of leveling the ground to make it suitable for the new building
Layer along the west side of the house, covering a layer with frequent inclusions of crumbly orange tufo with white specks that extends towards the west (under SU414). Pre-excavation, it appeared to extend east under the house, but this seems less secure following excavation. No further excavation in this part of Area A in 2010 campaign.