Samples and associated geological data are held at the British Geological Survey for Maritime Coastguard Agency (MCA), Civil Hydrography Programme (CHP), Bathymetric Survey HI1421; Approaches to the Wash, Area in SqKm: 306, (02/12/2013 to 26/05/2014), Standard: IHO S44ed5 Order 1a. Contract: Shallow. FY 2013/14. Contractor: Gardline.