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Table 2
Peak gas concentrations and atmospheric conditions measured during the three monitoring periods in the WHALI autonomous unit.
| WHALI unit |
EVA unit |
||||
|---|---|---|---|---|---|
| February 2022* | April 2022 | February 2023 | February 2023 | ||
| H2 (ppm) | Range | 5–493 | 0–330 | 5–52 | 1–180 |
| Average | 326 | 62 | 26 | 4 | |
| Standard Dev. | 124 | 58 | 10 | 9 | |
| CO2 (ppm) | Range | 442–8233 | 499–15,558 | 1697–10,023 | 279–7570 |
| Average | 7088 | 3815 | 6487 | 436 | |
| Standard Dev. | 1781 | 2205 | 1018 | 518 | |
| H2S (ppm) | Range | 0–0.05** | 0–0.4** | 0–0.24** | – |
| Average | 0.01** | 0.1** | 0.05** | – | |
| Standard Dev. | 0.01** | 0.1** | 0.04** | – | |
| Temperature (°C) | Range | 34–46 | 8–36 | 16–43 | 14–49 |
| Average | 40 | 21 | 28 | 29 | |
| Standard Dev. | 4 | 7 | 7 | 9 | |
| Pressure (hPa) | Range | 985–991 | 971–999 | 977–990 | 977–990 |
| Average | 988 | 986 | 984 | 984 | |
| Standard Dev. | 2 | 8 | 3 | 3 | |
| Groundwater Extracted (ml) | Total for 7 days | – | 20,299 | 30,087 | – |
| Range per sample | – | 0–375 | 0–196 | – | |
*February 2022 monitoring was limited to a 5-h period. **Below resolution of sensors.
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