1. To prevent or reduce waste production and its harmfulness, in particular by the consideration of—
(a)waste management in the design phase and in the choice of the method used for mineral extraction and treatment;
(b)the changes that the extractive waste may undergo in relation to an increase in surface area and exposure to conditions above ground;
(c)placing extractive waste back into the excavation void after extraction of the mineral, as far as is technically and economically feasible and environmentally sound in accordance with existing environmental standards at community level and with the requirements of these Regulations where relevant;
(d)where the site is a waste facility, putting topsoil back in place after closure or, if this is not practically feasible, reusing topsoil elsewhere; and
(e)using less dangerous substances for the treatment of minerals.