Chemtech Environmental’s WAC reports are designed to highlight when a value exceeds one of the limits provided by the standard. Below are some notes to enable you to understand how and why the numbers achieve a colour so that you can best interpret your results.

In the example below, there are two results where the 10:1 mg/kg value does not have any colour-coding active. Antimony has achieved a value below the limit of detection (LoD) which in turn is below the Inert Waste limit. Similarly, Arsenic has a result of 0.019 which is below the Inert Waste limit of 0.5, therefore the box does not change colour.

If there is a higher Antimony result, as per the report below, the box will change colour. With a 10:1 mg/kg result of 0.084, results have now exceeded the Inert Waste limit but are still within the threshold of Non-reactive Hazardous Waste, so the cell is highlighted in yellow to indicate the result is above the Inert Waste limit (also highlighted in yellow).

This same rule is applied with Non-reactive Hazardous Waste and Hazardous Waste. Once a limit has been exceeded, it will be colour-coded according to correspond with the heading above the limit values as demonstrated below.

Basically, a result will be coloured to the lowest of the threshold values exceeded. If it’s blank, then no breaches are recorded.

We provide this colour-coding system to all WAC reports by default but if you’re not a fan, we can turn it off too! Contact us at or give us a call on 01207 528578 and we’ll get it sorted for you.