Table 11. Concentrations of dissolved gases and chlorofluorocarbons in water collected from Cave Springs, a permanent pool in Lehman Caves, and two nearby springs, Great Basin National Park, Nevada.

[Site locations are shown in figure 2. Analyses were done by U.S. Geological Survey Chlorofluorocarbon Laboratory, Reston, Virginia. Sample dates and times are listed in tables 3 and 4. Abbreviation: –, no value for third sample because only two samples analyzed]

Dissolved gas or chlorofluorocarbon	Site 1 Cave Springs	Site 2 Pool in Lehman Caves	Site 3 Spring near upper Lehman Creek campground	Site 4 Marmot Spring
Dissolved gas (in milligrams per liter)
Number of samples analyzed	2	2	2	2
Nitrogen (N2)	13.8	13.7	15.2	14.2
	13.7	13.7	15.1	14.2
Argon (Ar)	0.515	0.522	0.578	0.543
	0.511	0.520	0.577	0.539
Oxygen (O2)	0.475	4.01	5.43	3.32
	0.772	3.83	6.38	0.627
Carbon dioxide (CO2)	13.6	7.57	13.8	19.2
	11.4	7.74	13.0	21.7
Methane (CH4)	0.0	0.0	0.0	0.0
	0.0	0.0	0.0	0.0
Chlorofluorocarbon (CFC; concentration in picograms per kilogram of water)
Number of samples analyzed	3	3	2	2
CFC-11	270	1270	621	454
	268	814	612	445
	318	743	–	–
CFC-12	167	261	315	240
	155	265	313	244
	148	257	–	–
CFC-113	34.1	62.2	86.8	59.6
	28.5	62.4	87.5	60.3
	25.5	63.0	–	–