1.8 98
Archaeological evaluation (trial trenching)
Trial trenches will be targeted to geophysical anomalies and targets interpreted through other non-intrusive assessments, i.e. where the potential is considered to be high as a result of previously recorded heritage assets, topography, and land use.
99 100
Trial trenches will also be placed to test areas that appear to be archaeologically ‘blank’ through previous non-intrusive assessments.
Trial trenching will be carried out as soon as possible following production of the technical geophysical reporting, and following land acquisition of the 55m Preferred Onshore Cable Corridor.
1.8.2 101 Aims and objectives
Should deposits and/or features be interpreted through previous non-intrusive assessments, the aim of trial trenching is to determine the extent, nature, age and state of preservation of any remains.
102
The number and location of trial trenches will be proportionate and sufficient to determine the requirement for preservation in situ, or else the requirement for advance/’set-piece’ archaeological excavation or Archaeological ‘Strip, Map and Record’.
103
It is the aim of the trial trenching programme to guide and ensure maximum time in the programme for preservation by record (archaeological excavation) of identified complex or dense archaeological deposits.
104
Areas interpreted through non-intrusive assessment and ‘truthed’ through trial trenching to be archaeologically negative will be subject to an archaeological watching brief during the construction phase.
1.8.3 105 Conditions
Detailed designs will identify the potential for impact to archaeological deposits, both in plan and in profile. Taking into account the results of the construction feasibility survey, suitable areas within the 35m working width/HDD/CCS areas will be subject to archaeological trial trenching, i.e. where the following conditions apply:
•
A physical impact is predicted, where desk-based and non-intrusive assessments indicate the likely presence of, or a high potential for, subsurface archaeological deposits
Outline Written Scheme of Investigation: Archaeology and Cultural Heritage (Onshore) Rev 01
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