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 results of the survey are limited to linear trend anomalies representing modern agricultural trends or identifying the location of field drains. Occasional discrete low magnitude and dipolar 'spike' anomalies likely have natural or modern causes and are of no archaeological interest. It remains unclear whether the spread of magnetic disturbance across the central parcel of the Site adjacent Upper Hanyards Farm could be a result of previous activity or since demolished structures associated with the farm or possibly the tipping/infilling of a former extraction site identified in LiDAR and aerial photographs of the site. The surveys have not recorded any anomalies which could relate to heritage features previously identified in the HS2 ES, Staffordshire HER or from LiDAR data/aerial photographs associated with medieval and post-medieval settlement activity or eighteenth and nineteenth century landscaping, which lead to the designation of Recognised Archaeological Zones (RAZ) 14 and 15 across parts of the Site.
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