| Date | Value |
|---|---|
| Mar 16, 2014 17:38 | 0.50 ppm |
| Mar 5, 2014 18:13 | 0.50 ppm |
| Jan 20, 2014 18:17 | 2.5 ppm |
| Sep 29, 2013 08:50 | 1.5 ppm |
| Sep 3, 2013 19:42 | 0.50 ppm |
| Aug 25, 2013 12:34 | 0.50 ppm |
| Aug 18, 2013 08:06 | 3.5 ppm |
| Aug 11, 2013 12:06 | 5 ppm |
| Aug 5, 2013 11:14 | 5 ppm |
| Jul 24, 2013 15:10 | 5 ppm |
| Jul 22, 2013 15:00 | 5 ppm |