Actually 1 meter into section Δ, the well lies under a filling of primarily Hellenistic date which had been thrown in as underpinning for the support of a 2nd c. A.D. Roman tile-mosaic floor.
POU is 15.80-16.35m ... First half of 1st c. A.D ... Agora VII, p. 225 ... Agora XXXIV, p. 181.