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Field plot of the Vejen aquifer. Plan view showing the bromide tracer plume and the location of aquifer sampling points inside (A1, A2, B1, B2, C1, and C2) and outside (NX1 to -4) the herbicide-exposed area. The groundwater velocity is approximately 0.5 m day−1 (8), and the temperature is 10°C (38). At sampling (40 days after the field injection had been terminated), bromide as well as herbicides were no longer present within the monitoring network (8).
