Development is not permitted by Class A if—
(a)in the case of waste deposited in an excavation, waste would be deposited at a height above the level of the land adjoining the excavation, unless that is provided for in a waste management scheme or a relevant scheme;
(b)in any other case, the superficial area or height of the deposit (measured as at 21st October 1988) would be increased by more than 10%, unless such an increase is provided for in a waste management scheme or in a relevant scheme.