TMFs may be used in place of other materials on a trial basis by agreement with the authority. They can be used in the layers appropriate to their CBR classification as defined by Table A9.2, and regardless of the nature of reinstatement materials used above and below, in any combination of the following:
At any position within the surround to apparatus or backfill, as the entire layer or combined with any other permitted backfill materials, in any proportion, within any reinstatement.
As a combined surround to apparatus and backfill within any reinstatement.
If classified as a TMF Class A material as per Table A9.2, it may also be used in the sub-base layer within any road, footway, footpath or cycle track.