Ecus Ltd was commissioned by Morrison Water Services, on behalf of Yorkshire Water, to carry out archaeological monitoring of geotechnical investigations along the route of a new wastewater pipeline between Full Sutton and Stamford Bridge, East Riding of Yorkshire. The works comprised a watching brief during excavation of nine trial holes (machine-excavated test pits) and five hand-dug borehole starter pits. No archaeological features or deposits were identified during the monitoring programme, and no significant artefacts were recovered. None of the excavated trial holes or boreholes were located in areas where archaeological remains had been anticipated, based on the findings of the desk-based assessment and geophysical survey. The negative results from the monitoring of the ground investigation works supported this conclusion.