Wessex Archaeology was commissioned by AECOM on behalf of Linkconnex (a partnership between BAM Ritchies, AECOM, and MACE) and their client, National Highways, to undertake geoarchaeological monitoring of Ground Investigation (GI) works undertaken in advance of a proposed new A27 bypass to the south of Arundel (the Scheme). This report contains the results of this GI monitoring. 1.1.2 To fulfil the aims and objectives of the monitoring, all machine dug trial pits were subject to archaeological and geoarchaeological monitoring. In total 29 trial pits were subject to archaeological and geoarchaeological monitoring. Archaeological monitoring of topsoil stripping during compound set-up was carried out where there was a risk of impacting archaeological remains. Prior to the commencement of GI works, and in consultation with West Sussex County Council and Historic England's Science Advisor, the locations of proposed boreholes were subject to specialist geoarchaeological review. This review identified a range of boreholes suitable for monitoring, which would enable baseline assessment of the superficial deposits present across the Scheme. In total 57 boreholes were subject to geoarchaeological monitoring. The results of the on-site geoarchaeological monitoring have been combined with a geoarchaeological review of all 232 draft GI logs. No significant archaeology was identified during monitoring of GI works. However, the monitoring has enabled the Quaternary stratigraphy present across the route to be determined, and a baseline assessment of the archaeological and geoarchaeological potential of these deposits to be provided. A geoarchaeological deposit model and associated Geoarchaeological Landscape Characterisation (GLC) of the Scheme is presented. The GLC subdivides the areas investigated by the GI into ten Geoarchaeological Characterisation Zones (GCZs) based on variation in the Quaternary sediments. An initial assessment of the archaeological and geoarchaeological potential of the deposits present in each GCZ has been developed. Additionally, monitoring recovered samples from key deposits suitable for palaeoenvironmental assessment. Quaternary deposits within the Scheme encompass at least three, and possibly four, periods of Middle Pleistocene near-shore marine and estuarine sedimentation belonging to the Sussex and Hampshire coastal plain raised beach sequence, with deposits of the Westbourne/Arundel, Aldingbourne and Brighton/Norton Beaches delimited. Ad...