Site 100 - Geophysics Survey Report Heritage Non-intrusive Survey Reports Group 012

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. The only identifiable features in the magnetometer data are occasional sporadic low magnitude and dipolar 'spike' anomalies of natural and modern origin respectively and a strip of magnetic disturbance along the southern boundary of the parcel caused by fencing. The findings of the survey reflect the limited archaeological potential of the general area which is not recorded as within a RAZ and that was identified in the Historic Environment search conducted for the HS2 Environmental Statement and remote sensing survey data which did not identify any features within Site 100.