 During construction work in 1998, the site was excavated, and small shells in the layers of soil below the oldest part of the mound were dated to approximately 500 BC, meaning the Terp van Kolkhuizen (and almost certainly other mounds in the surrounding region as well) has been inhabited since at least that time period.The fourth minor terp, the Wierde van Hollebrantsje, is nowadays only visible as a slight difference in elevation.In 1897, the cooperative dairy factory Concordia was founded by dairy farmers from Burdaard.