Desk Based Assessment Pentraeth Proposed Housing Development
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Archaeoleg Brython Archaeology Desk Based Assessment Pentraeth Proposed Housing Development Document Number B1906.DBA.01.1 Pentraeth Proposed Housing Development Desk Based Assessment Prepared for Clwyd Alyn Housing Ltd. by Iwan G. Parry Archaeoleg Brython Archaeology January 2020 B1906.DBA.01.1 Contents Crynodeb .............................................................................................................................................................................. 2 Summary ............................................................................................................................................................................... 2 1 Introduction ............................................................................................................................................................... 3 Figure 1: Location Plan and Identified Assets ............................................................................................................... 4 2 Methodology ............................................................................................................................................................. 5 2.1 Desk Based Research ......................................................................................................................................................... 5 2.2 Walkover Survey .................................................................................................................................................................. 5 2.3 Geophysical Survey ............................................................................................................................................................ 5 2.4 Assessment of Value and Impact .................................................................................................................................. 5 Table 1: Criteria for assessing the value of heritage assets ...................................................................................... 6 Table 2: Criteria for the assessment of magnitude of impact ................................................................................. 7 Table 3: Significance of Effect Matrix ................................................................................................................................ 7 2.5 Recommended Mitigation .............................................................................................................................................. 7 3 Background ................................................................................................................................................................ 8 3.1 Project Background............................................................................................................................................................ 8 3.2 Topographic Description ................................................................................................................................................. 8 3.3 Geology .................................................................................................................................................................................. 8 3.4 Historical and Archaeological ........................................................................................................................................ 8 4 Results ........................................................................................................................................................................ 12 4.1 Map Regression ................................................................................................................................................................. 12 Table 4: Pentraeth Tithe Schedule ................................................................................................................................... 12 4.2 LiDAR ..................................................................................................................................................................................... 12 st Figure 2: Ordnance Survey 1 Edition Map, 1888 ...................................................................................................... 13 Figure 3: LiDAR DSM 1m ...................................................................................................................................................... 14 4.3 Walkover Survey ................................................................................................................................................................ 15 Plate 1: General shot of proposed development area, view from north west ............................................... 15 4.4 Geophysical Survey .......................................................................................................................................................... 15 Figure 4: Geophysics, Magnetic Interpretation .......................................................................................................... 16 4.5 High Value Designated Assets ..................................................................................................................................... 17 4.6 Other Identified Assets ................................................................................................................................................... 18 Table 5: Undesignated assets within 500m of the proposed development ................................................... 19 5 Conclusion ................................................................................................................................................................ 20 6 Sources Consulted ................................................................................................................................................. 21 6.1 Archival Sources ................................................................................................................................................................ 21 6.2 Unpublished Sources ...................................................................................................................................................... 21 6.3 Published Sources ............................................................................................................................................................ 21 6.4 Websites ............................................................................................................................................................................... 21 Appendix I: Geophysics Report 1 Crynodeb Gofynnwyd i Archaeoleg Brython gan Clwyd Alyn Housing Ltd. i gwblhau asesiad ben-desk archaeolegol i gyfarwyddo cais gynllunio ar gyfer cynllun i adeiladu 23 o dai ym Mhentraeth, Ynys Môn. Mae’r asesiad yn canolbwyntio ar glustogfa o 1km o ffin y datblygiad arfaethedig, hefyd canhwyllydd arolwg geoffisegol o’r safle i adnabod unrhyw nodweddion tanddaearol. Mae’r asesiad yn nodi dau ased o werth uchel yn y glustogfa. Mae Plas Gwyn yn adeilad rhestredig Gradd II* ac mae Gerddi Plas Gwyn yn ardd restredig, ni fu’r datblygiad yn cael unrhyw effaith arnynt. Mae dau Adeilad Rhestredig Gradd II o fewn 500m i’r datblygiad arfaethedig, ni fu effaith ar unrhyw un ohonynt. Mae map degwm Pentraeth yn dangos bod y cae presennol wedi bod yn ddau gae ym 1845. Mae ymchwil o fapiau Arolwg Ordnans cynnar yn dangos nad yw’r safle wedi newid yn sylweddol yn ers diwedd yr 19eg ganrif. Mae’r arolwg geoffiseg wedi dangos bod nodweddion tanddaearol yn y safle. Mae edrychiad y nodweddion yn awgrymu mai ffosydd sy’n perthyn i system o gaeau cynnar ydynt. Awgrymir bod gwerthusiad maes (ffosydd gwerthuso) yn cael ei gynnal er mwyn deall y nodweddion tanddaearol. Summary Brython Archaeology were asked by Clwyd Alyn Housing Ltd. to undertake an archaeological desk- based assessment to inform a planning application for 23 dwellings at Pentraeth, Anglesey. The assessment is focused on a 1km buffer of the proposed development boundary, a geophysical survey was also undertaken of the site to identify any buried features. The assessment identified two high value assets in the study area. Plad Gwyn is a Grade II* Listed Building and Plas Gwyn Gardens are a registered park and garden, neither would be impacted by the proposed development. Two Grade II Listed Buildings were also noted within 500m of the development, neither would be impacted by the proposed development. The Pentraeth Tithe map shows that the current field was two fields in 1845. Assessment of early Ordnance Survey maps shows that there has been little change to the proposed development area since the late 19th century. The geophysical survey identified buried features which are consistent with an early field system. It is recommended that field evaluation (evaluation trenching) is undertaken to gain a better understanding of the buried features. 2 1 Introduction Archaeoleg Brython Archaeology CYF. (ABA) have been commissioned by Clwyd Alyn Housing Ltd. to undertake an archaeological assessment of land proposed for a new housing development at Pentraeth, Anglesey (NGR SH52307905, Figure 1). The assessment comprises a cultural heritage Desk Based Assessment (DBA), walkover survey and geophysical magnetometer survey. The assessment has been prepared to meet the relevant standards of the Chartered Institute for Archaeologists and all stages have been monitored by Gwynedd Archaeological