SU 8156 is a single ashlar forming part of the northern wall of Room I16. This wall may have been cut into for the construction of the basin to the north (8184); alternatively, and perhaps more likely, it and the other walls and floors of I16 were constructed more or less simultaneously with whatever materials were convenient. Regardless, the basin 8184 would then have been constructed last.
Mortar features and fill of basin
Layer of mortar and rubble south of 8152; N-S wall south of wall 8157; Wall east of SU 8156; Ashlar block east of wall su 8038; Rubble deposit south of wall 8158
Mortar feature north of 8152; Wall east of SU 8156 Ashlar block east of wall su 8038; Mortar and rubble feature north of 8157; Mortar and rubble feature north of 8156