Table 1.

Summary of water chemistry from the 75 to 81 m depth range of well GS-18, Penn Mine, California, 2001–2002 [see Additional file 2].

Parameter	range of values
Temperature (°C)	20–21
pH	3.90–4.27
Eh (V)	0.35–0.51
Specific Conductance (mS/cm)	3.55–3.74
Al (mg L-1)	4.9–8.9
Na	51–63
K	12–17
Mg	90–110
Ca	440–500
FeT	526–586
Fe(II)	521–584
Mn	6.9–8.2
Cd	0.013–0.039
Cu	<0.003–0.01
Zn	10–13
AsT	0.048–0.121
As(III)	0.035–0.112
Cl	9.7–17
SO4	2,580–2,900
DOC	1.8–2.2