190 Start / End date
In order to enable the coding of the change of the analyzing laboratory during a year start_date and end_date were integrated into the QA forms.
The start_date is the first (analysing) date from which the laboratory analysed the data from the respective plot, sampler and parameter.
The end_date is the last day of the analyses of the respective plot sampler and parameter combination.
Only in case, that a laboratory has been changed during one monitoring year, it would be nessecary to use an additional data row with the respective time period in which the new laboratory has been analysing the data.