Table 4. Concentrations of nutrients in water collected from Cave Springs, a permanent pool in Lehman Caves, and two nearby springs at Great Basin National Park, Nevada.

[Site locations are shown in figure 2. Nutrient analyses were done by U.S. Geological Survey National Water Quality Laboratory. All values are in milligrams per liter as reported by the laboratory. Symbols: <, less than; E, estimated]

Nutrient	Site 1 Cave Springs	Site 2 Pool in Lehman Caves	Site 3 Spring near upper Lehman Creek campground	Site 4 Marmot Spring
Sample date	09-07-07	09-06-07	09-07-07	09-06-07
Time of sample	12:30	10:30	17:00	15:45
Ammonia (NH3) as nitrogen (N) (filtered)	<0.02	<0.02	<0.02	<0.02
Nitrate (NO3) + nitrite (NO2) as N (filtered)	0.065	0.640	0.476	0.367
Nitrite (NO2) as N (filtered)	E0.002	E0.001	E0.001	E0.001
Total nutrient nitrogen as N (filtered)1	0.12	0.94	0.50	0.40
Total nutrient nitrogen as N (unfiltered)1	0.45	0.94	0.51	0.64
Phosphorus (P) (filtered)	0.035	0.048	0.017	0.022
Orthophosphate (PO4) as P (filtered)	0.032	0.052	0.017	0.022
Total phosphorus as P (unfiltered)	0.115	0.051	0.020	0.061

¹Total nutrient nitrogen includes ammonia, nitrate, nitrite, and organic nitrogen in sample.