Appendix N Archaeology, Architectural Heritage and Cultural Heritage For inspection purposes only. Consent of copyright owner required for any other use. EPA Export 13-02-2014:23:38:08 Archaeology, Architectural Heritage and Cultural Heritage Report For the proposed Corrib Onshore Gas Pipeline County Mayo For inspection purposes only. Consent of copyright owner required for any other use. EPA Export 13-02-2014:23:38:08 By Margaret Gowen & Co. Ltd. For RPS Group On behalf of Shell E & P Ireland Ltd (SEPIL) May 2010 For inspection purposes only. Consent of copyright owner required for any other use. EPA Export 13-02-2014:23:38:08 Illustrations Figures Figure 1 &1A Route overview, RMP site location & sites of archaeological potential Figure 2 Ordnance Survey mapping for Glengad (1st (1838-1839) & 2nd (1895-1896) Figure 3 Ordnance Survey mapping for Glengad (3rd edition (1913-1917) & RMP place map) Figure 4 Ordnance Survey mapping for Aghoos & Bellagelly South (1st & 2nd edition) Figure 5 Ordnance Survey mapping for Aghoos & Bellagelly South (3rd edition & RMP place map) Figure 6 William Bald’s map (surveyed 1809-1817, published 1830) Figure 7 Test excavation and environmental sample location (approx) at Aghoos townland Plates Plate 1 Glengad; Recorded Enclosure MA004-015, (ID A1) view to northeast Plate 2 Glengad; Landfall at Glengad, view to west-northwest Plate 3 Aghoos; ID A3 (non-archaeological For inspection purposes only. in nature), view to west Consent of copyright owner required for any other use. Plate 4 Aghoos; Commemorative mass site, ID A4, view to northeast Plate 5 Aghoos; Part of curving wall/enclosure associated with ID A4 (Commemorative mass site and more of the curving wall/enclosure in the background), view to southeast Plate 6 Aghoos; ID A2, (potential archaeological site) view to east Plate 7 Bellagelly South; ID A5, view to the southeast Plate 8 Test excavation of mound (ID A3), Aghoos EPA Export 13-02-2014:23:38:08 Tables Table 1 Type of impact Table 2 Quality of impact Table 3 Significance of impact Table 4 Duration of impact Table 5 Townland and placenames traversed by the proposed pipeline Table 6 Inventory of archaeology and cultural heritage sites in proximity to the proposed pipeline and associated works Table 7 Impact assessment Table 8 Mitigation summary Appendices Appendix 1 Inventory of Recorded Archaeological Monuments Appendix 2 Methodology Appendix 3 References Appendix 4 National Monuments Legislation (1930-2004) For inspection purposes only. Consent of copyright owner required for any other use. EPA Export 13-02-2014:23:38:08 Archaeological, architectural and cultural heritage assessment Corrib Onshore Pipeline ________________________________________________________________________________________________ 1 Introduction 1.1 Margaret Gowen and Co. Ltd undertook an archaeological, architectural and cultural heritage assessment of the proposed pipeline development. In addition, an assessment of underwater archaeology was undertaken by Archaeological Diving Company Ltd (ADCO). 1.2 The proposed pipeline route and ancillary development avoids all recorded archaeological monuments (RMP sites –Appendix 1) and sites of archaeological potential as identified through a detailed desk study, field inspection and test excavation (Figures 1 & 1A). However, it must be noted that in any area subject to development, there is always a possibility that archaeological features/stray finds can be revealed during construction, even in areas in which no impact is predicted. 1.3 It is anticipated that any impacts of an archaeological, architectural and cultural heritage nature would be encountered during monitoring of the construction phase of work and would be resolved prior to the operational phase. 1.4 The following sections describe the methodology used in the assessment of the existing environment from an archaeological, architectural and cultural heritage perspective. This report also examines the potential impacts of the proposed development and recommends mitigation measures to ameliorate these impacts on features of archaeological potential, architectural heritage or cultural heritage. For inspection purposes only. 1.5 The following legislation,Consent standards of copyright ownerand requiredguidelines for any otherwere use. considered and consulted for the purposes of this evaluation: x National Monuments Acts, 1930-2004; x The Planning and Development (Strategic Infrastructure) Bill, 2006; x The Heritage Act, 1995; x Guidelines on the information to be contained in Environmental Impact Statements, 2002, EPA; x Advice Notes on Current Practice (in preparation of Environmental Impact Statements), 2003, EPA; x NRA Guidelines for the Assessment of the Archaeological Heritage Impact of National Road Schemes, 2006; x NRA Guidelines for the Assessment of Architectural Heritage Impact of National Road Schemes, 2006; May 2010 Appendix N - 1 Margaret Gowen & Co. Ltd EPA Export 13-02-2014:23:38:08 Archaeological, architectural and cultural heritage assessment Corrib Onshore Pipeline ________________________________________________________________________________________________ x Frameworks and Principles for the Protection of the Archaeological Heritage, 1999, (formerly) Department of Arts, Heritage, Gaeltacht and Islands; x Architectural Heritage (National Inventory) and Historic Monuments (Miscellaneous Provisions) Act, 2000 and the Local Government (Planning and Development) Act 2000; and x Code of Practice between Bord Gáis Éireann and the Minister for Arts, Heritage, Gaeltacht and the Islands (now the Department of Environment Heritage and Local Government), 2002. For inspection purposes only. Consent of copyright owner required for any other use. May 2010 Appendix N - 2 Margaret Gowen & Co. Ltd EPA Export 13-02-2014:23:38:08 Archaeological, architectural and cultural heritage assessment Corrib Onshore Pipeline ________________________________________________________________________________________________ 2 Project Description 2.1 The proposed Corrib Onshore Pipeline development consists of the following elements: x A gas pipeline extending from the landfall at Glengad to the Gas Terminal at Bellanaboy Bridge; x As part of this pipeline a tunnel; approximately 4.9km in length; most of which will be constructed under Sruwaddacon Bay from Aghoos to Glengad; x Umbilicals and services which extend from the Gas Terminal to the landfall at Glengad; x Outfall pipeline extending from the Gas Terminal to the landfall and onto an agreed point offshore; x Landfall Valve Installation & access road; x Ancillary development associated with the construction of the onshore gas pipeline (site compounds, etc) including removal of up to 75,000m3 of peat from the construction of the onshore pipeline to the Srahmore Peat Deposition Site. 2.2 Construction The construction of the proposed pipeline will take approximately 26 months to complete. The construction of the pipeline will involve a number of activities. These activities have been summarised below: For inspection purposes only. Consent of copyright owner required for any other use. x Mobilisation and compound set-up in Glengad and Aghoos x Construction of the Landfall Valve Installation (LVI) in Glengad x Construction of the pipeline in Glengad x Construction of the segment lined tunnel in Sruwadaccon Bay from Aghoos to Glengad; and x Construction of the pipeline from Aghoos to the Bellanaboy Terminal In general, pipeline construction on arable land in Glengad will be carried out by excavating a trench approximately 5m wide and 2m deep. The LVI will be excavated to an average depth below existing ground level of 3m within a dished area of May 2010 Appendix N - 3 Margaret Gowen & Co. Ltd EPA Export 13-02-2014:23:38:08 Archaeological, architectural and cultural heritage assessment Corrib Onshore Pipeline ________________________________________________________________________________________________ approximately 45m x 45m. A site compound (SC1) will be located adjacent to the LVI footprint and will be 75m x 60m. Construction of the Corrib Onshore Pipeline in Sruwaddacon Bay will be by a trenchless technique generally known as segment lining. This tunnel will be constructed for approximately 4.9km from Aghoos to Glengad, 4.6km of which will be underneath Sruwaddacon Bay.. Tunnelling operations will require a tunneling compound in Glengad (SC2), which will include the reception pit for the tunnelling process, and a tunneling compound in Aghoos (SC3) which will include a starting pit for the tunnelling process. The site compound (SC2) will be approximately 3,500m2 while site compound (SC3) will be approximately 24,000m2. This compound in Aghoos is anticipated to be in place for approximately 26 months and will be constructed by excavating the peat to within approximately 1.0m of the peat base, and replacing it with stone. The compound (SC3) at Aghoos will also include a stringing area of 21,000m2. In areas of peat, a stone road will be constructed within which the pipeline and services will be installed. The stone road will also provide access for construction plant and machinery. The stone road will be 12m wide in most areas, and generally 3m deep. Site compounds will also be located in Bellagelly South (SC4 – 80m x 50m) and at the Terminal (SC5 – 80m x 125m). For inspection purposes only. Consent of copyright owner required for any other use. 2.3 Ancillary development A number of ancillary developments will facilitate the construction of the proposed onshore gas pipeline.