Sample Collection. Samples were collected from the river and from the groundwater wells in March and July 1195. Sample from the river were taken by a 4900 portable contaminant sampler from Manning Products. The sampler was cleaned by pumping for at least 20 cycles 0.01 M HNO3 through the tube. The bottles were soakes for 48 h in 0.01 M HNO3 and rinsed with Nanopure water. The stainless steel end of the tube was removed, and the end was fixed on a stone to hold the inflow under water. Prior to the sampling, river water was pumped through the tube for at least five cycles. For the sampling of the Glatt, every 15 min a sample of 150 mL was taken, and six samples were collected together in one bottle (0.5-h composite sample). A total of 39 samples was taken. Groundwater sampkes from well GW1 were taken by second sampler (samme type as for the river). the autosampler tube was introduced together with a submerged pump (Whale) into the well. the pump was operated with a low flow (0.5-1 L/min) during the whole sampling. this lead to a steady flow of fresh water toward the well. the autosampler took a sample every 30 min, and six samples were collected in a bottle (3-h composite sample). A total of 57 samples was taken.