9796ba59-2368-4be1-bf84-79940d02e5c0 English series series 2026-05-14T15:27:06 MEDIN 3.1.2 geoscientificInformation oceans Seismic reflection SeaDataNet Parameter Discovery Vocabulary 2026-04-23 revision Seismic refraction SeaDataNet Parameter Discovery Vocabulary 2026-04-23 revision Side-scan sonar SeaDataNet Parameter Discovery Vocabulary 2026-04-23 revision Magnetics SeaDataNet Parameter Discovery Vocabulary 2026-04-23 revision Bathymetry and Elevation SeaDataNet Parameter Discovery Vocabulary 2026-04-23 revision Pre-Construction monitoring The Crown Estate Renewable Energy Development Phases 2012-05-15 revision Renewable Energy Lease area The Crown Estate Renewable Energy Development Areas 2012-05-15 revision Meteorological geographical features GEMET - INSPIRE themes, version 1.0 2009-07-31 revision Oceanographic geographical features GEMET - INSPIRE themes, version 1.0 2009-07-31 revision SeaDataNet sea areas 2012-11-07 revision English Channel SeaVoX Vertical Co-ordinate Coverages 2020-05-21 revision water column 2012-07-02T00:00:00 2012-10-30T23:59:59 1.87 2.15 51.71 52 TCE-383 Marine Data Exchange 2012, EMU, Galloper, Phase 1 Geophysical Site Investigation Surveys Phase 1 Geophysical Site Investigation Surveys 2025-03-04T09:45:49 publication English EMU Limited (EMU) was commissioned by Galloper Wind Farm Limited (GWFL) to conduct a geophysical investigation and provide detailed seabed information on the Galloper Offshore Wind Farm UXO and Shallow Gas Surveys project. The survey was required in order to mitigate the risks of UXO and shallow gas before phase 1 works affecting the seabed are carried out. The UXO Survey consisted of 40 sites each covering 150 x 150 m whilst the Shallow Gas Survey comprised of 200 m x 200 m area over the same 40 sites. The site comprised of two areas, A and B, which were located between 26 km and 53 km off the coast of East Anglia. Area A contained 29 survey sites and Area B contained 11 survey sites. The UXO surveys required full magnetometer coverage based on a maximum sensor spacing of 6 m as well as 200% coverage for sidescan sonar, and multibeam bathymetry. The shallow gas surveys required 5 main multi-channel seismic lines and 5 cross lines on each site. The aims of the survey were to: - Locate any potential UXO hazards that may be present on the seabed or buried at a shallow depth within each survey area using a multiple magnetometer array; - Locate any accumulations of shallow gas using multichannel seismic data; - Produce a comprehensive report on the survey results. There will be no limitations when published on the Marine Data Exchange otherRestrictions Data Must be used in accordance to the Marine Data Exchange's Terms of Use: https://www.marinedataexchange.co.uk/content/info/terms-of-use otherRestrictions The Crown Estate +44 020 7851 5000 enquiries@thecrownestate.co.uk custodian EMU Ltd - Operations +44 (0) 2392 205500 marketing@emulimited.com originator The Crown Estate +44 020 7851 5000 enquiries@thecrownestate.co.uk distributor Galloper Offshore Wind Limited galloperwindfarm@rwe.com owner notPlanned Delimited Documents Geographic Information System Text or Plaintext https://www.marinedataexchange.co.uk/details/TCE-383/summary A link to the web service or dataset. https://www.marinedataexchange.co.uk A link to the general host site. Commission Regulation (EU) No 1089/2010 of 23 November 2010 implementing Directive 2007/2/EC of the European Parliament and of the Council as regards interoperability of spatial data sets and services 2010-12-08T00:00:00 publication Conformity with the Commission Regulation (EU) No 1089/2010 was either not relevant to this dataset or not a requirement of the Marine Data Exchange for the creation and submission of this dataset; therefore, conformity has not been assessed and cannot be declared False series The RV Discovery was mobilised in Shoreham from the 2nd to 8th July 2012. The Shallow Gas Survey was conducted between the 9th and 16th July and 28th July to 5th August. A surrogate items test for the UXO survey was initially conducted on 17th July (two further tests were conducted as a result of a change of vessels on the 27th August and the 19th October). Survey operations then commenced from 17th to 21st July and 6th to 12th August. At this point RV Discovery was demobilised. The IMOR was mobilised from the 20th to 26th August to replace RV Discovery. UXO survey operations recommenced on the 26th August and continued until the 29th September when IMOR’s charter expired and she left the project. The RV Discovery was remobilised on 9th October and began operations on the UXO survey on 20th October. The UXO Survey was completed on 30th October 2012. The survey was planned and carried out in conformance with EMU Limited’s quality management system, which complies with the requirement of BS EN ISO 9001:2008. For planning and operation purposes a QA pack was incorporated into the front of every log book detailing administrative duties that needed to be fulfilled and a detailed description of the survey setup including a list of the main survey parameters. The log book was filled in by hand and formed a detailed record of all activities and events that occurred on-board. Digital online logs were updated for every line surveyed. These included date, time, line name, instrument setup parameters and highlighted any events or data quality issues. A copy of these logs have been provided separately to this report in digital format. The performance of the survey instrumentation was constantly monitored by the online surveyor and online geophysicist. Any data quality issues were immediately highlighted and logged in the online logs. Upon review, remedial action could be performed and a decision made as to whether any reruns were required. The performance of the survey was also monitored by the offline processors soon after data acquisition. Again any issues were resolved and a decision made whether to resurvey any of the lines. Processing logs were maintained on-board the vessel and in the office which allowed the progress of the processing work to be monitored and the processing parameters used for each dataset to be detailed. Data storage, control and archiving of the data were undertaken in compliance with EMU Limited’s Data Management Policy. Final quality control checks were carried out with care and due diligence prior to the delivery of this report. The Crown Estate +44 020 7851 5000 enquiries@thecrownestate.co.uk pointOfContact EPSG Geodetic Parameter Registry 2022-12-12 revision WGS 84 / UTM zone 31N