 During the Corozal Survey Project, Norman Hammond excavated at San Estevan and expanded Bullard's map with several additional plaza groups around the site core.It was the ceramic collections from these excavations at San Estevan along with initial testing at Nohmul, Santa Rita, Colha and Cuello that Duncan Pring first established the Swazey, Lopez Mamom and Cocos Chicannel phases.In 1989 and 1990, Laura Levi mapped outlying house groups at San Estevan in detail and excavated several domestic structures.