| Date | Value |
|---|---|
| May 18, 2016 08:02 | 0.00 ppm |
| May 4, 2016 16:42 | 0.00 ppm |
| Feb 22, 2016 15:38 | 0.00 ppm |
| Oct 12, 2015 15:53 | 0.00 ppm |
| Aug 7, 2015 06:20 | 0.00 ppm |
| Aug 4, 2015 10:17 | 0.25 ppm |
| Aug 3, 2015 06:26 | 0.00 ppm |
| Jul 21, 2015 16:27 | 0.00 ppm |
| Jun 23, 2015 11:51 | 0.00 ppm |
| Jun 22, 2015 16:53 | 0.00 ppm |
| Jun 21, 2015 16:13 | 0.00 ppm |
| Jun 18, 2015 17:35 | 1.5 ppm |
| Jun 18, 2015 16:20 | 0.00 ppm |