The application of regional geochemical reconnaissance data for uranium in surface waters to identifying environmentally sensitive areas

Examination of National Geochemical Reconnaissance (NGR) maps produced by the Geological Survey of Canada showing trace-element concentrations in stream water and sediment from southern British Columbia, reveals several areas where U levels in water are significantly elevated. Some of the values reported, including those for stream waters used to supply domestic needs, approach the 20 ppb maximum acceptable concentration for drinking water. In order to evaluate the application of NGR data, collected originally for use in mineral exploration, to identifying areas of possible public health concern, a follow-up sampling program was undertaken. Both surface and, where possible, groundwater samples were obtained at 12 sites representing a range (