1 The analysis for dissolved ammonia nitrogen is more precise than the analysis for total (or dissolved) ammonia plus organic nitrogen at concentrations less than 0.1 mg/L. The laboratory reporting limit for dissolved ammonia nitrogen is 0.002 mg/L and for total (or dissolved) ammonia plus organic nitrogen is 0.1 mg/L.
2 During 1997, daily rainfall of 0.01 in. or more occurred 101 days at site 1 compared to 77 days at site 2. Site 1 had an average daily rainfall (considering only days when rainfall occurred) of 0.33 in. The site 2 daily rainfall was 0.46 in.