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BOC Immingham Dissolved Acetylene Project Environmental Statement: Vol. 2 Main Text Value Description Example Minimal Elements of the historic environment which are of insufficient significance to merit consideration in planning decisions and hence be classed as heritage assets. Undesignated features with very limited or no historic interest. Can also include highly degraded designated assets that no longer warrant designation. 14.12.2 Table 14.3 sets out the definitions for determining the scale of change resulting from an impact. Scale of Change Large Adverse Medium Adverse Minor Adverse Table 14.3 Definitions of Assessment of Scale of an Impact Description of Nature of Change Substantial harm to, or loss of, an asset’s significance as a result of changes to its physical form or setting. For example, this would include demolition, removal of physical attributes critical to an asset, loss of all archaeological interest or the transformation of an asset’s setting in a way that fundamentally compromises its ability to be understood or appreciated. The scale of change would be such that it could result in a designated asset being undesignated or having its level of designation lowered. Less than substantial harm to an asset’s significance as a result of changes to its physical form or setting. For example, this could include physical alterations that remove or alter some elements of significance but do not substantially alter the overall significance of the asset, notable alterations to the setting of an asset that affect our appreciation of it and its significance, or the unrecorded loss of archaeological interest. Limited harm to an asset’s significance as a result of changes to its physical form or setting. For example, this could include physical changes that alter some elements of significance but do not noticeably alter the overall significance of the asset and small-scale alterations to the setting of an asset that hardly affect its significance. Neutral No appreciable change to an asset’s significance. Minor Beneficial Medium Beneficial Large Beneficial Limited improvement of an asset’s significance as a result of changes to its physical form or setting For example, this could include physical changes that reveal or conserve some elements of significance but do not noticeably alter the overall significance of the asset, or small-scale alterations to the setting of an asset that improve our ability to appreciate it. Notable enhancement of an asset’s significance as a result of changes to its physical form or setting For example, this could include physical alterations that conserve or restore elements of significance, notable alterations to the setting of an asset that improve our appreciation of it and its significance, or changes in use that help safeguard an asset. Substantial enhancement of an asset’s significance as a result of changes to its physical form or setting For example, this could include major changes that conserve or restore elements of high significance, alterations to the setting of an asset that very substantially improve our appreciation of it and its significance, or changes in use that safeguard an asset e.g. by taking it off the At Risk Register. 5100935.404 Environmental Statement August 2011 254
BOC Immingham Dissolved Acetylene Project Environmental Statement: Vol. 2 Main Text 14.12.3 The level of the environmental effect (severity) is determined through a combination of the value of the asset and the scale of the change, as set out in Table 14.4. This table does not provide a formulaic assessment and professional judgement is used at all stages in the process. Value Table 14.4 Matrix for Determining Impact Significance Severity High Neutral Slight Moderate Moderate Major Major Medium Neutral Slight Moderate Moderate Major Low Neutral Neutral slight Slight Moderate Slight Minimal Neutral Neutral Neutral Slight Baseline Description Archaeological Remains Neutral Minor Medium Large Change (Adverse or Beneficial) 14.13 No known archaeological sites are recorded on the HER, or other data sources, within the boundary of the proposed development site. Historic maps from the 18 th, 19 th and 20 th centuries also contain no evidence of historical activity within the development site. However, there are known archaeological remains within the vicinity of the proposed site, including: � an undated cropmark that could indicate the presence of archaeology (HER number 0553/1/0); � a Roman period enclosure which has been subject to past archaeological investigations and evaluation (HER Number 0040/1/0); and � a probable former sea defence bank (HER Number 0647/2/0). 14.14 Whilst these remains lie outside the development area it was considered possible that other remains may lie within the development site. A Geophysical Survey 5 of the development field was undertaken by GSB in May 2011. The methodology and scope of the survey was agreed with NELC’s Archaeologist (see Table 14.1). 14.15 The Geophysical Survey Report is provided in Appendix 14.A. As indicated in Figure 14.1, the survey identified five features of interest (numbered 1 to 5), only one of these (number 5) is within the development area. This feature is thought to be a modern non-ferrous service trench or drain. The Survey did not identify any other features of interest or any archaeological remains within the development area. The Geophysical Survey Report 5 was shared with NELC’s Archaeologist and, following discussion, NELC confirmed (see Table 14.1) that they concurred with the recommendation that no further archaeological evaluation was required for the Dissolved Acetylene Project development site. 14.16 In terms of deeper deposits below the range of the geophysical survey, the preliminary findings of the recent GI works (see Chapter 7 Geology, Hydrogeology and Land Quality) indicate that there are peat deposits and or peat with clay at 7.0 to 8.4 m bgl. These deposits may contain palaeoenvironmental remains. 5100935.404 Environmental Statement August 2011 255
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