Ground based in situ observations of bulk_sampler at Jarczew (PL0002R). These measurements are gathered as a part of the following projects EMEP and they are stored in the EBAS database (http://ebas.nilu.no/). Parameters measured are: calcium in precip (mass_concentration_of_calcium_in_precipitation), magnesium in precip (mass_concentration_of_magnesium_in_precipitation), pH in precip (mass_concentration_of_pH_in_precipitation)