| Date | Value |
|---|---|
| Aug 31, 2013 11:49 | 0.00 ppm |
| Aug 19, 2013 06:56 | 0.00 ppm |
| Aug 15, 2013 06:50 | 0.10 ppm |
| Aug 14, 2013 04:09 | 0.25 ppm |
| Aug 13, 2013 12:12 | 0.25 ppm |
| Aug 12, 2013 03:40 | 0.25 ppm |
| Aug 11, 2013 02:40 | 0.25 ppm |
| Aug 10, 2013 11:20 | 0.50 ppm |
| Aug 5, 2013 11:20 | 2 ppm |
| Aug 4, 2013 05:45 | 0.00 ppm |