An archaeological evaluation, incorporating geo-archaeological investigations, was undertaken by Cotswold Archaeology in April 2010 at the proposed site of Severnside ERC, Avonmouth, Bristol. A total of six trenches and three boreholes was excavated. The archaeological fieldwork identified a consistent alluvial sequence in all the evaluation trenches. This included an undated organic clay silt layer, recorded between 2.9m and 4.65m AOD, interpreted as an undated, salt marsh deposit. The stone footings and concrete floor surface of a post-medieval building were identified within trench 5, 10m west of an in-filled boundary ditch. Both the building and the ditch are depicted on the 1881 1st Edition Ordnance Survey map.