Possible section of E retaining wall for n/s running road located next to probably road preparation layer 4046 with a cut in between (drainage channel? sidewalk?). This is most likely a continuation of wall 4039 directly to the south. On the east side it seems to cover a grouping of tufo paving stones (4041), although the exact relationship between 4040 and 4041 should be clarified. Shot in, photographed, documented and photomodeled in 2012 when N extent is fully exposed.