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All Defra evidence contracts are closely monitored by Defra specialists working with policy colleagues. Contract variations are required if there are significant changes to any of the details in the original agreement (eg costs, required outputs, timetable, research team, etc).
In June 2010 the Defra contract UK Eutrophying and Acidifying Atmospheric Pollutants (UKEAP) was amended to include £23,030 of additional work. The work was to establish the levels of fluoride deposition in the UK following the continued eruption of the volcano Eyjafjallajökull, in Iceland. This included increasing the frequency of sampling from fortnightly to weekly at 8 PrecipNet sites for a three-month period; the addition of the fluoride ion to the list of species analysed for all samples for the three-month period; and the additional analysis of samples from the nominated eight sites that were collected before the eruption.