Semicontinuous water quality measurements at the Tracy Fish Collection facility, Tracy, California, April 2001 to March 2002

Water quality variables temperature, hydrogen-ion concentration (pH), dissolved oxygen, conductivity, oxidation-reduction potential, and turbidity were measured at 30-minute intervals using a calibrated Hydrolab Datasonde 4a multiprobe installed in the Old River at the Bureau of Reclamation\u27s Tracy Fish Collection Facility (TFCF), located near Tracy, California, in the southern region of the Sacramento-San Joaquin River Delta. This is the second year of validated data collection and covers data collection from April 1, 2001, through March 31, 2002. The water quality data were compared to local meteorology, hydrology, tides, export pumping at State and Federal pumping plants, fish salvage, and temporary barrier installation and removal schedule data. Water quality data for April 1, 2001 through March 31, 2002 were comparable to the previous year\u27s validated data. Annual media values were 18.1C for temperature, 463 microsiemens per cm for conductivity, 7.9 mg/L for dissolved oxygen, 554 millivolt for redox potential, 7.65 for pH, and 24.8 Nephelometric turbidity units for turbidity. The most significant influence on water quality appears to be the status of nearby temporary channel barriers and the operation of the Delta Cross Channel near Walnut Grove, California. When barriers are installed and the Cross Channel gates are open from April through October, daily variations and maximum conductivity are much lower than when higher conductivity water from the San Joaquin River flows relatively unimpeded to the TFCF

Semicontinuous water quality measurement at the Tracy Fish Collection Facility, Tracy, California, April 2002 to March 2003

Water quality variables including temperature, pH, dissolved oxygen, electrical conductivity, oxidation-reduction potential, and turbidity were measured at 30-minute intervals using a calibrated Hydrolab Datasonde 4a multiprobe installed in the Old River at the Bureau of Reclamation\u27s Tracy Fish Collection Facility (TFCF), located near Tracy, California, in the southern region of the Sacramento-San Joaquin River Delta. This report summarizes the third year of baseline water quality data collection covering the period between April 1, 2002 through March 31, 2003. The water quality data were compared to local meteorology, hydrology, tides, export pumping at State and Federal pumping plants, fish salvage at the TFCF, and temporary barrier installation and removal schedule data. Third year water quality data showed responses to increased runoff in the Sacramento River and continued drought in the southern Central Valley. Annual ranges 9with median values in parentheses) were 8.2 to 26.9C (17.7C) for temperature, 195 to 1020 microsiemens per cm (400 microsiemens per cm) for conductivity, 4/04 to 12.5 mg/L (7.94 mg/L) for dissolved oxygen, 279 to 773 mV (581 mV) for redox potential, 4.60 to 8.67 (7.52) for pH, and \u3c5 to \u3e150 NTU (17.6 NTU) for turbidity. As with the previous years\u27 data, the most significant influence on water quality appears to be tides, the status of nearby temporary channel barriers, and the operation of the Delta Cross Channel gates near Walnut Grove, California. When barriers are installed and the Cross Channel gates are open from April through October, daily variations and maximum EC are much lower than when higher conductivity water from the San Joaquin River flows relatively unimpeded to the TFCF