TABLE 1.

Geochemical measurements of Shiprock groundwater

Well	Concn of:					pH	Temp (°C)
	U(VI) (ppb)	DO (mg liter−1)	Nitrate (mg liter−1)	Sulfate (mg liter−1)	Sulfide (μg ml−1)
826	2,848	0.41	148	13,396	0.0027	6.53	15.5
615	2,458	0.54	3,907	13,539	0.0027	6.84	10.9
608	2,089	0.31	2,688	11,715	0.0026	6.75	8.4
610	1,687	0.48	3,090	9,772	0.0014	7.06	9.6
624	1,205	0.18	189	8,673	0.0004	7.04	14.0
617	544	0.32	793	5,579	0.0024	7.00	11.5
828	343	3.05	168	3,294	0.0059	6.89	13.0
857	302	0.23	<1	3,529	0.0088	7.08	13.3
853	227	0.24	<1	2,021	0.0048	7.12	12.5
626	90	0.21	1	2,831	0.0027	7.31	9.4
648	0	0.00	<1	2,000	0.0202	8.0	30.0