Wessex Archaeology was commissioned by Astrazeneca to undertake the archaeological evaluation of land at the Avlon Works, Severnside (centred on ST 3546 1835). Astrazeneca are preparing an Environmental Statement to accompany a planning application to South Gloucestershire Council to construct an effluent treatment plant (ETP) on the Site. A scoping opinion issued by South Gloucestershire Council required a programme of archaeological evaluation to inform the environmental impact assessment. No features of definite archaeological origin were recorded in any of the trial trenches. However, a single linear feature cut through the upper peat produced a small assemblage of cattle bone showing evidence of butchery using metal tools, suggesting human activity of likely Iron Age/Romano-British date in the vicinity of the Site.