Regulation 10

Where, pursuant to Article 5 of Directive 2009/90/EC, the calculated mean value of a measurement, when carried out using the best available technique not entailing excessive costs, is referred to as “less than limit of quantification”, and the limit of quantification of that technique is above the environmental quality standard, the Department must not use the result for the substance for the purposes of assessing the overall chemical status of that water body.