ABSTRACT
While undertaking a regional survey of nitrate in shallow alluvial groundwater in the Fraser Valley near Vancouver, B.C., the project hydrogeologist queried one homesteader about the quality of his well water. “Why, it’s crystal clear . . . it’s recharged by the glaciers up there on Mount Baker.” Following his gaze to Baker, some 60 km south on the far side of the Fraser River, the hydrogeologist speculated on the improbability of the fellow’s claim. In such a case, environmental isotopes serve nicely to trace the origin of the groundwaters and reconcile the two opinions.
