Toward the beginning of Late Chiripa, the Middle Chiripa Choquehuanca structure was abandoned and gradually filled with a Late Chiripa domestic midden (Whitehead in [Hastorf et al. 1998]). At this time another sunken court structure was constructed to the south of the mound, in the Llusco area (Paz in [Hastorf et al. 1998,Paz Soría 1999]; see Figure 6.4). This structure measured approximately 13x11 meters. The walls, like those of the Choquehuanca structure, were made of unworked alluvial cobbles set in a mud mortar. The structure had a prepared floor of compact white clay, and a subterranean drainage canal was found in the northwest corner, the earliest example of a drainage feature associated with a corporate construction. It was abandoned in approximately 600 B.C. There are no indications of associated surface structures, though these would almost certainly have been destroyed by modern plowing.