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6.

Determination of EQS or threshold value exceedance for each annual record:

• for records with no data or flags regarding the LOQ, no EQS exceedance or threshold value was determined; this yields 68,764 groundwater annual records (1.89% of all groundwater records in the reference dataset) for which threshold value cannot be determined, and 24,682 surface water annual records (0.68% of all surface water records in the reference dataset) for which EQS exceedance cannot be determined;
• exceedances in groundwater: if the mean calculated value is above LOQ and greater than the groundwater quality standard of 0.1 μg/l;
• exceedances in surface waters:
  • the calculated annual mean value is above LOQ and greater than the AA-EQS;
  • the calculated annual maximum is above LOQ and greater than the maximum allowed concentration MAC EQS.