The Trench 11 area showing the perimeter wall (on the left), the curtain wall, and the Period 3C drain that cut deeply into the Period 3B deposits (see the labeled plan in 72). The sediments outside of the perimeter wall are hard packed ashy debris deposits. These served to form a glacis that promoted drainage away from the wall and sealed earlier architectural remains beneath. Trench 9 excavations are in the upper right corner of the image.