Report on seven trial trenches excavated to inform proposed residential development on land at Moat Farm, Watery Lane, Mareham le Fen. The earliest phase of activity on the site was represented by a single residual Mesolithic-early Neolithic flint flake recovered from a probable Medieval feature. Seven small undated ditches identified across the site, aligned north-northeast to south-southwest or east-northeast to west-southwest, may be contemporary with Medieval ditches on the same alignment encountered during previous trial trenching in the adjacent field (see ELI14045). Two large north-south aligned ditches were encountered at the northern end of the site, within the current farmyard. 13th-15th century pottery was recovered from both features. Environmental sampling of the eastern ditch revealed a large quantity of burnt grain, interpreted as a deliberate dumping event, possibly after the burning of a grain store. At the southern end of the site, the excavation confirmed the presence of a large pit identified in the prior geophysical survey (see ELI14050). Pottery, the partial skeleton of a large adult dog, environmental remains including charred wheat, barley, pulse, sloe, hazelnut, fish and frog bones, chicken eggshell and freshwater mussel were all present in this feature, which was interpreted as a gravel extraction pit repurposed as a domestic waste pit.