Samples and associated geological data are held at the British Geological Survey for Maritime Coastguard Agency (MCA), Civil Hydrography Programme (CHP), Bathymetric Survey HI1059; W Approaches to English Channel, Area in SqKm: 8822, (01/05/2004 to 01/05/2005), Standard: IHO S44ed4 Order 1. Contract: W Approaches to. FY 2004/05. Contractor: Gardline.