| Date | Value |
|---|---|
| Oct 10, 2019 13:49 | 0.25 ppm |
| Oct 1, 2019 21:41 | 0.25 ppm |
| Sep 21, 2019 14:12 | 0.25 ppm |
| Sep 10, 2019 16:22 | 0.25 ppm |
| Sep 5, 2019 16:20 | 0.25 ppm |
| Sep 2, 2019 16:54 | 0.25 ppm |
| Aug 27, 2019 17:55 | 0.25 ppm |
| Aug 24, 2019 15:15 | 0.25 ppm |
| Aug 22, 2019 14:46 | 0.25 ppm |
| Aug 19, 2019 23:10 | 0.25 ppm |
| Aug 17, 2019 14:05 | 0.50 ppm |
| Aug 15, 2019 18:54 | 0.50 ppm |