Paragraph 4
The substances or articles authorised for deposit at sea are—
(a)
iron and steel, copper and aluminium;
(b)
stone and rock;
(c)
concrete and grout;
(d)
sand and gravel;
(e)
plastic and synthetic;
(f)
material extracted from within the offshore Order limits during construction drilling and seabed preparation for foundation works;
(g)
weights used for the calibration of vessels, consisting of a hessian sack, metal shackles or chains; and
(h)
marine coatings, other chemicals and timber.