Table 1. Water ion analysis.

Concentration of soluble metals, ions, nitrogen, sulfur, and organic compounds in the water samples (parts per million).

Sample	DOM	LAG	MW5	MW6	SF city
sample depth	100 m	surface	4 m	4 m	tap
pH	8.17	8.16	8.65	8.63	8.09
electrical conductivity (dS/m)	0.32	5.65	2.04	0.74	0.07
sodium absorption ratio	1.80	5.50	1.60	0.70	0.70
dissolved organic carbon (DOC)	0.70	127.30	19.60	4.00	2.00
Bicarbonate (HCO3†)	1.90	46.60	4.90	3.10	0.30
CO3†	0.10	< 0.10	1.70	1.00	< 0.10
sulfate-S (SO4-S*)	2.30	18.00	68.80	15.30	1.10
NH4-N	< 0.05	332.80	< 0.05	< 0.05	0.38
NO3-N	4.30	0.15	105.70	21.54	< 0.05
K*	4.64	632.40	11.80	1.62	0.38
Ca*†	0.98	1.49	4.56	3.93	0.23
Mg*†	0.61	7.79	13.04	2.96	0.07
Na*†	1.58	11.96	4.74	1.24	0.27
Cl†	0.43	5.94	2.88	0.72	0.13
B*	0.13	0.60	0.43	0.15	0.03
Cr*	< 0.005	< 0.005	< 0.005	< 0.005	< 0.005
Mn*	0.073	0.010	0.530	0.117	< 0.005
Fe*	< 0.010	0.718	< 0.010	< 0.010	< 0.010
Ni*	< 0.005	0.009	< 0.005	< 0.005	< 0.005
Cu*	< 0.010	0.251	0.016	< 0.010	0.092
Zn*	< 0.005	0.033	< 0.005	< 0.005	< 0.005
Cd*	< 0.005	< 0.005	< 0.005	< 0.005	< 0.005
Pb*	0.012	0.017	0.012	0.012	< 0.010

‘<’ = below the detectable limit indicated.

* indicates ‘soluble’.

^† indicates ‘equivalent parts per million’.

Statistics available in S14 Table.