This was a series of seven ashlar blocks aligned E-W perpendicular to and partly under 5585 (coccio pesto floor), which probably served as the cover of a subterranean drainage feature. Robbery cut 5690 was over these blocks, from which a previously existing wall was probably robbed out. This wall would have rested on these blocks as foundation. A similar feature was found in the eastern section of area F in 2013 (5307) with three blocks of a similar nature. Perpendicular to this feature, another similar line of blocks was found between and partially under 5550 and 5585. They appear to be narrower in the S end and widen to the North. The southern blocks are larger and have fewer cuts, while the northernmost blocks are smaller and have frequent cuts of an irregular nature.