1. Objectives coverage of:
various determinands with different properties and concentration bands
different European regions
different dynamics of groundwater
(non)periodic time series

2. Requirements for quality data (1)
Selection of determinands
ph-value
electric conductivity
oxygen
nitrate
ammonium
chloride
pesticides
chlorinated hydrocarbons
.....

3. Requirements for quality data (2)
Information required:
sampling site identification (unique code)
location (GW-body, ...)
sampling period (date)
determinand specification and units
values (numbers, <n, [n])
detection limits and limits of quantification
analytical methods
level of confidence
Formats will be specified and distributed

4. Requirements for quality data (3)
Provision of values
concentration detected and quantified
result: numbers
concentration is below the limit of quantifacation
<n limit of quantifacation =n
concentration is not detected
[n] detection limit =n