Originally, samples are analyzed for suspended sediment, alkalinity, pH, ammonia nitrogen, nitrate, nitrite, dissolved organic nitrogen, ortho and total phosphorus, sodium, potassium, calcium, magnesium, and silica. Sulfate was determined for WY 1972 and sulfate and chloride in WY 1979. Aluminum, iron, manganese, and nitrite were below levels of detection and were subsequently dropped from analysis. All analyses are completed within 6 weeks. Generally, samples are stored at 0 degrees C if not analyzed immediately.
Samples are then combined and are assigned sample type codes.
Grab samples should be taken when no sample has been collected through the proportional sampler for any single week. Grab samples should be combined with other grab samples and submitted separately to the lab - a carboy could contain one, two or three weekly grab samples. All data was automated in the fall of 1979. Regular updates are made annually. Fredriksen, R. L. 1969.