6. In carrying out the works the Company may—
(a)deviate laterally from the lines or situations of those works as shown on the deposited plans and sections to any extent not exceeding the limits of deviation;
(b)deviate vertically from the levels as shown to any extent not exceeding 3 metres upwards; and
(c)deviate vertically in a downwards direction from the levels of the works as shown to such extent as may be found necessary or convenient.