Article 6 Contour Lines, Gradient and Faults

Every such plan shall be marked with contour lines showing vertical variations from Ordnance Datum at intervals not exceeding five metres.

In every case the vertical variation represented by any consecutive contour lines marked on every such plan shall be the same throughout the plan and the lines shall be marked with the height relative to the Ordnance Datum.

Every such plan shall show the general direction and rate of dip of the strata underlying the tip.

Every such plan and section shall show, so far as it can be ascertained, the position of any known fault which may affect the security of the tip.