Total Dissolved Gas and Water Temperature in the Lower Columbia River, Oregon and Washington, 2007: Quality-Assurance Data and Comparison to Water-Quality Standards

Most in-situ field checks of total-dissolved-gas sensors with a secondary standard were within � (plus or minus) 1% saturation after 3 to 4 weeks of deployment in the river. All of the field checks of barometric pressure were within �2.5 millimeter of mercury of a secondary standard, and water-temperature field checks were all within �0.2 �C. 3. For the eight monitoring sites in water year 2007, an average of 99.5% of the total-dissolved-gas data were received in real time by the USGS satellite downlink and were within 1% saturation of the expected value on the basis of calibration data, replicate quality-control measurements in the river, and comparison to ambient river conditions at adjacent sites.

Data received from the sites ranged from 97.9% to 100.0% complete. [Summary provided by the USGS.]