Samples are taken from the existing footways and carriageways and transported to our Laboratory for testing to assist with the detection of  Polycyclic Aromatic Hydrocarbons which is found in old Coal Tar material. This is a toxic material and when excavated there is a legal requirement for safety measures to protect workforce and the general public.

All contaminated materials are to be disposed of by a licensed waste disposal operator.

  • By using a PAK marker aerosol together with an Ultra Violet light we can identify the level of contamination in accordance with ADEPT guidance 2019/8 Managing reclaimed Asphalt Highways and Pavements.

Core sample prior applying the PAK white marker spray to determine if there are Polycyclic Aromatic Hydrocarbons in the bituminous material.

A layer of the PAK spray is left to dry for a few minutes and if there are Polycyclic Aromatic Hydrocarbons present within the material there will be a yellowish discolouration.

In a dark environment under Ultra Violet light the parts with PAKs present will show up as a bright yellow/green colour. The PAK test is an indication not a measurement.