physical dimensions of the services indicated may therefore differ from their magnetic extents in plan; it is assumed that the centreline of services is coincident with the centreline of their anomalies, however. Similarly, it is difficult to estimate the depth of burial of the services through gradiometer survey.
149.
It should be noted that small, weakly magnetised features may produce responses that are below the detection threshold of magnetometers. It may therefore be the case that more archaeological features may be encountered than have been identified through geophysical survey. The very weak responses of half of the ring ditch discussed above illustrate this point. It is possible that other similar features exist in this area of land that fell below the detection threshold and have therefore gone undetected.
1.7 Evaluation Results
1.7.1 Introduction 150. Nineteen 30m long trenches were excavated at the proposed East Anglia THREE convertor station location in order to provide a minimum of 5% coverage across the site. The aims of the evaluation were to verify the previous geophysical survey, characterise the nature of any archaeological remains and inform any future mitigation strategy.
1.7.2 Results 151. A north-west – south-east aligned ditch was observed within four trenches in the western part of the site. This feature was approximately 1.2m wide but only 0.5m deep and contained frequent roots. The ditch could be seen to correspond to a former field boundary forming the western boundary of Bullen Green which is visible on the 1838 tithe map and still shown as in extant in the 1970s.
152.
Just to the east of this feature and on a similar alignment was another ditch, observed in two of the trenches, within this was a sherd of late medieval or early post-medieval pottery. This ditch was approximately 1.2m wide and 0.6m deep and seems to correspond with a boundary shown on the 1838 tithe map but absent by the 1882 OS first edition.
153. The only other feature observed, within the eastern part of the site, was a vertical sided machine cut feature with a flat base that was of modern date.
Preliminary Environmental Information April 2014
East Anglia THREE Offshore Windfarm Appendix 25.1: Potential Archaeological Receptors Page 41
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