wall likely associated with 8141 8240 and 8238 and therefore to a moment in which the tailed space was narrowed, a new floor was laid and the arch was closed off. The absence of clear stratigraphical relationships with these walls makes this just an hypothesis.
N S wall in room 11 between walls 8240 and 8238
photo taken from west
photo taken from the west
photo taken from the West
Cross Section with measurements of Walls SU 8245.