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Table 2. Summary of current (1995) required, recommended, and optional water-quality <br />constituents to be measured in the three National Water-Quality Assessment Program ground- <br />water components of the Occurrence and Distribution Assessment <br />[Required water-quality constituents to be measured for the Occurrence and Distribution Assessment <br />are determined partly by the water-quality topics of national interest selected for National Assessment. <br />Topics selected for National Assessment (1994) are nutrients, pesticides, and volatile organic com- <br />pounds. The topics selected can change over time. Quality-control samples also are required - types <br />of quality control samples depend on study component. Req, Required; Rec, Recommended; Opt, <br />Optional; NWQL, National Water Quality Laboratory; SC, Schedule; LC, Laboratory Code] <br />Water-quality constituent <br />or constituent class Study-Unit <br />Survey Land-Use <br />Studies Flowpath <br />Studiesr <br />Method2 <br />Field measurements <br />- Temperature Req Req Req Field <br />- Specific electrical <br />conductance Req Req Req Field <br />- pH Req Req Req Feld <br />- Dissolved oxygen Req Req Req Field <br />- Acid neutralizing Field <br />capacity (ANC) <br />(unfiltered sam <br />le)3 Rec Rec Rec incremental <br />p <br />- Alkalinity Req Req Req Field <br />(filtered sample)3 incremental <br />- Turbidity4 Rec Rec Rec Field <br />Major inorganics Req Req Req NWQL SC2750 <br />Nutrients Req Req Req NWQL SC2752 <br />Filtered organic carbon Req Req Opt NWQL SC2085 <br />Pesticides Req Req Opt NWQL SC2001/2010 <br /> NWQL SC2050/2051 <br />Volatile organic <br />compounds (VOCs) Req Req or Optic Req or Opt6 NWQL SC 2090 <br />Radon Req Req or Rec? Req or ReC6 NWQL LC 1369 <br />Trace element94 Opt Opt Opt NWQL SC 2703 <br />Radium Opt Opt Opt NWQL-Opt <br />Uranium Opt Opt Opt NWQL-Opt <br />Tritium, tritium-helium, <br />chlorofluorocarbons (CFCs)g <br />Rec <br />Rec <br />Rec NWQL LC1565 <br />(tritium) <br />Environmental isotopes9 Rec Rec Rec NWQL-Opt <br />6