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. . Sampling timing will approximate the movement or a water mass through the system, i.e., staggered downstream at the rour gaging stations used ror discharge measurements. Water samples will be taken rour times per 2~ hrs at each site on days when sampled. Requirements: Permission rrom NPS to install data collection platrorm at gaging sites (see Stream Discharge section). Permission rrom NPS to take water samples. Placement or personnel at gag~ng sites. ~vailability Or cold storage and rapid transport equipment to get samples to analytical laboratory. ~vailability Or qualiried analytical labs to do analyses. Possible placement or hydrolab on one or more platrorms. Water Mass Movement Objectives: Determine the rate at which a particular mass or water moves through the system rrom Glen Canyon Dam to Diamond Creek or Lake Mead. Justirication: The movement Or peaks and troughs through the system during rluctuating rlows does not correspond with the movement or a particular mass Or water, thus use Or stage discharge measurements are only estimates Or water movement through the system. Nutrient and sediment dynamics Or the system are closely aligned with water mass movement as well as discharge whether fluctuating or constant. Knowing the rate or movement Or a mass or water through the Canyon will make evaluation Or nutrient and sediment dynamics more accurate. Initial measurements or mass movement should be based on constant flows to allow for future comparisons with dirferent fluctuating flows. Methods: Use of an appropriate inert tracer (e.g., Rhodamine WT). Tracer will be placed at gage sites on the same day after the system has reached equilibrium (or closest 6