May be of Hellenistic origin when cistern system went out of use.
For a general note on the cistern see Nb. ΟΕ III, pp. 246 ff.
Objects from B 586 various depths (no subdivision): S 2324-S 2330,
P 34894, ... Late 2nd-early 6th c. A.D.
Cistern at 70/ΚΕ and channels. Part of same system as D 17:3 and D 17:5. It was set against a corner of the lowest foundation block. Thus one is forced to assume that enough of the wall remained at least ... Ca. 200-150 B.C.