Table 3.
Description of geochemical measurements conducted on well waters sampled in 2017
| Well | WAB188 | WAB105 | WAB104 | WAB55 | NSHQ4 | WAB71 | NSHQ14B (50 m) |
NSHQ14C (85 m) |
DL (μM) |
|---|---|---|---|---|---|---|---|---|---|
| pH | 7.6a | 8.3a | 8.5 | 9.2 | 10.5b | 10.6 | 11.1 | 11.3 | – |
| Fe2+ (μM) | 0.4 | 5.0 | 2.0 | 2.5 | 0.8 | 0.2 | 0.1 | 2.0 | 0.006 |
| SO42− (μM) | 1130 | 292 | 477 | 875 | 683 | 42 | 131 | 2 | 1.04 |
| NO2− (μM) | 6 | DL | DL | 8 | DL | 14 | 17 | 16 | 2.17 |
| NO3− (μM) | 118 | 135 | 123 | 143 | 3.0 | 2.5 | DL | DL | 1.61 |
| H2 (μM) | 0.92 | DL | DL | DL | DL | 0.51 | 21 | 164 | 0.45 |
| CH4 (μM) | 1.69 | 0.02 | 0.02 | 0.10 | 155 | 12.6 | 34.6 | 12.6 | 0.015 |
| DIC (mM) | 3.0 | 3.5 | 3.5 | 2.9 | 0.04 | 0.12 | 0.05 | 0.13 | 0.098 |
Potential sources of measured oxidants, reductants, and single-carbon compounds in well waters are reported. Detection limits (DL) are indicated in the far right column
DL detection limit in μM
a Data collected from wells in 2016 are reported since measurements were not collected during the 2017 field season
b Data collected from wells in 2015 are reported since measurements were not collected during the 2016 or 2017 field seasons