Ground based in situ observations of precip at Riga (LV6000U) using wet_only_sampler. These measurements are gathered as a part of the following projects Independent and they are stored in the EBAS database (http://ebas.nilu.no/). Parameters measured are: arsenic in precip (mass_concentration_of_arsenic_in_precipitation), cadmium in precip (mass_concentration_of_cadmium_in_precipitation), lead in precip (mass_concentration_of_lead_in_precipitation), nickel in precip (mass_concentration_of_nickel_in_precipitation)