Site 275 - Geophysics Survey Report Heritage Non-intrusive Survey Reports Group 019

The survey was undertaken using four Bartington Grad601 sensors mounted at 1m intervals (1m traverse interval) onto a rigid carrying frame. The system was programmed to take readings at a frequency of 10Hz (allowing for a 10-15cm sample interval) on roaming traverses (swaths) 4m apart. These readings were stored on an external weatherproof laptop and later downloaded for processing and interpretation. The system was linked to a Trimble R8s Real Time Kinetic (RTK) differential Global Positioning System (dGPS) outputting in NMEA mode to ensure a high positional accuracy for each data point, in accordance with EAC guidelines (EAC 2016). The survey has not identified any anomalies of definite or possible archaeological origin. Findings from the survey are limited to a potential field drain, cultivation trends, areas of magnetic disturbance at field entrances or boundaries and occasional discrete low magnitude and dipolar 'spike' anomalies of natural and modern origin respectively. The survey has also not identified any anomalies which might relate to assets identified in RAZ's 8 and 9 recorded as burnt mounds of presumed prehistoric date and evidence for medieval glass making and medieval cultivation and settlement at Moreton respectively. Overall, the findings of the survey reflect the limited archaeological potential of the Site that was identified in the Historic Environment search conducted for the HS2 Environmental Statement.