The salinity of the aquifers varies significantly as you move across the Athabasca region and into Cold Lake and other areas. It's driven by the proximity to salt in the subsurface, and a whole load of other issues relating to the groundwater movement. So Devon and its Jackfish project can find saline water, which crosses the 4,000 TDS demarcation line. If it's 4,100, it's saline water; if it's 3,900, it's fresh water.
So as you move around the region and drill these water exploration wells, you find a significant amount of variability. It can vary from 1,500 to 15,000 or 40,000 in salinity.