This Department of Environment and Crown Estates commisioned survey took place in June 1991 in the Humber-Wash area on board the Kommandor Surveyor for the assessment of marine sand and gravel aggregate material. Seabed samples were collected using BGS Vibrocorer, Clamshell grab and a seabed camera. Technical details of the survey are contained in BGS report WB/91/17C. Study area report WB/92/1.