Column Heading	Description
2H/1H	2H/1H stable istope ratio (per mil)
15N/14N	15N/14N stable istope ratio (per mil)
18O/16O	18O/16O stable istope ratio (per mil)
222Radon	"222Radon, total (ug/L)"
222Radon	"222Radon, total (pci/L)"
Tritium	"Tritium, precision estimated (pci/L)"
Tritium_tot	"Tritium, total (pci/L)"
Uranium	"Uranium, dissolved (ug/L)"
	
	
Other abbreviations:	
-	no data available
(ug/L)	micrograms per liter
(pci/L)	pico curie per liter
(per mil)	parts per thousand
<	Less than signifies that the number that follows is the method detection limit
	
	*The isotopic ratios are reported as delta values. A positive value means that the sample contains more of the
	heavy isotope than the standard. A negative value means that the sample contains less
	of the heavy isotope than the standard
	"(U.S. Geological Survey, at url http://wwwrcamnl.wr.usgs.gov/isoig/res/funda.html, August 29, 2000)."