The remains of a terracing and containing wall emerged on the western edge of the excavated area, at a height of 68.50 m a.s.l. It was built on a north-south alignment, in roughly hewn grey tufa blocks of rather irregular size, bonded with soft earthy mortar. Its function was to protect the beaten earth road. The latter was excavated for a length of circa 5.00 m.

In the layer obliterating the wall there were traces of the eruptive deposits from 79 A.D. which had been disturbed in modern times. The dating of the structure to a period pre-dating 79 A.D. is also compatible with the other archaeological evidence identified in the south-eastern sector of the excavation, certainly datable to the beginning of the 1st century A.D. This was a cuniculus belonging to the so-called Formiello aqueduct which, in the excavated stretch did not present inspection shafts. It was built in opus caementicium poured into timber shuttering, using chippings and irregular blocks of grey tufa bonded with abundant mortar. On the bottom of the structure, terracotta tubuli were set into a make up of small tufaceaous blocks bedded in mortar.

It is likely that the cuniculus constituted a secondary branch of the Formiello aqueduct which, crossing the hillside agricultural terrain, fed into the collection system down hill.