12.—(1) Provision must be made for the collection, treatment and disposal of all water entering or arising on the Order land during highway construction operations to ensure that there is no discharge of contaminated or polluted drainage to ground or surface waters.
(2) All foul drainage must be discharged to a public sewer or else to a sealed tank, the contents of which must be removed from the Order land in their entirety.
(3) Any chemical, oil or fuel storage container on the Order land must be sited on an impervious surface with bund walls, and the volume of the bunded area must be the equivalent of 110% of the volume of the container and must contain within its curtilage all fill and draw pipes, vents, gauges and sight glasses.
(4) The drainage system of the bund must be sealed with no discharge to any watercourse, land or underground strata.
(5) No part of the authorised development is to commence until a scheme and programme of pollution control measures has been submitted to and approved by the local planning authority, in consultation with the Environment Agency. The scheme must include measures for sediment removal at all drainage outfalls.
(6) The authorised development must be carried out in accordance with the scheme and programme approved under sub-paragraph (5).