Horizontal coordinate information is referenced to the North American Datum of 1983 (NAD 83). Supplemental Information Concentrations of chemical constituents in water are given in either milligrams per liter (mg/L) or micrograms per liter (µg/L). Concentrations of nitrogen species in water are given in milligrams per liter as nitrogen (mg/L-N). Concentrations of phosphorus species in water are given in milligrams per liter as phosphorus (mg/L-P). Total nitrogen is the sum of total Kjeldahl nitrogen (U.S. Geological Survey parameter code 00625, also known as ammonia plus organic nitrogen) and dissolved nitrate plus nitrite (U.S.
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