This hydrogeologic study of the Triassic Montney reservoir in the oil-prone Tangent area on the Peace River Arch of northern Alberta was conducted to gain an understanding of the relationship between the upper and lower Montney hydrostratigraphic units and their separate formation water salinity domains. Deliverables include salinity and head maps, pressure vs. elevation plots, a stratigraphic cross-section and hydrostratigraphic diagrams.