Site 054 - Geophysics Survey Report Heritage Non-intrusive Survey Reports Group 016

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 identified anomalies indicative of the agricultural use of the parcel, most notably modern field drains, and cultivation techniques. One field boundary, as seen on historical mapping, is identified in the center of the northern parcel, while a second is recorded in the center of the most south-westerly parcel. Discrete low magnitude anomalies are recorded in the two southern parcels and are ascribed an interpretation of 'uncertain' as their exact origin is unclear. High magnitude responses near or adjacent to existing field boundaries are caused by the presence of highly magnetic material either within the boundaries or as a spread of sub-surface material. Further high magnitude responses are recorded adjacent to the modern high voltage pylon in the center of the northern parcel. A high magnitude linear response identified within the most southwesterly parcel records a former field boundary, however the magnetic response is significantly higher than that of a typical boundary, which may suggest a change of use such as a farm track. Occasional, discrete, low magnitude and dipolar 'spike' anomalies are of natural and modern causes respectively. High magnitude responses near or adjacent to existing field boundaries are caused by the presence of highly magnetic material either within the boundaries or as a spread of sub-surface material. Occasional, discrete, low magnitude and dipolar 'spike' anomalies are of natural and modern causes respectively. The Site sits in an area of low archaeological potential outside of a RAZ and with little evidence to suggest a different conclusion.