TABLE 1.
Description of sampling sites
| Well or hot tap water | Temp (°C) | pH at 22°C | Amt of Cl (mg/liter) | Depth (m) | Yr drilled | Flow rate (liters/s) | Filtration time (h) | Sample vol (liters) | Presence of microbes |
|---|---|---|---|---|---|---|---|---|---|
| RG-39a | 91.4 | 9.5 | 20 | 2,100 | 1984 | 58.3 | 3.8 | 55.7 | Yes |
| MG-18a | 71.8 | 12 | 2,043 | 1973 | 46.6 | 3.3 | 106 | Yes | |
| RV-5a | 129.2 | 9.2 | 6 | 741 | 1959 | 52.3 | 24 | 1,872 | No |
| SN-4b | 84.3 | 8.1 | 2,362 | 2,025 | 1972 | >30 | 2.52 | 117.9 | No |
| SN-5c | 99.2 | 8.5 | 1,265 | 2,207 | 1981 | >30 | 3.2 | 139.9 | No |
| Hot tap waterd | 76 | 9.4 | 0.5–186 | 634–2,857 | 1959–1984 | >30 | 20 | 1,900 | Yes |
a
Data are from reference 17a. Temperature was measured during sample collection.
b
In well SN-4 the sampled water was 84.3°C, but this well has previously yielded water of temperatures up to 117°C. The well has cooled down due to the drilling and subsequent production of a deeper well nearby (20).
c
The temperature varies from 95 to 105°C.
d
The hot tap water was a mixture of geothermal fluid transported from 50 operating geothermal wells into geothermal water tanks and then delivered into the laboratory through the one-way district heating system. The fluid from each well varied in chemical composition and temperature before it was mixed in the water tanks.